![Yinghai Lu](/assets/img/avatar_default.png)
Russ Anderson reported: | There is a regression that is causing a NULL pointer dereference | in free_irte when shutting down xpc. git bisect narrowed it down | to git commit d585d06(intr_remap: Simplify the code further), which | changed free_irte(). Reverse applying the patch fixes the problem. We need to use irq_remapped() for each irq instead of checking only intr_remapping_enabled as there might be non remapped irqs even when remapping is enabled. [ tglx: use cfg instead of retrieving it again. Massaged changelog ] Reported-bisected-and-tested-by: Russ Anderson <rja@sgi.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <4CCBD511.40607@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
4118 lines
100 KiB
C
4118 lines
100 KiB
C
/*
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* Intel IO-APIC support for multi-Pentium hosts.
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*
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* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
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*
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* Many thanks to Stig Venaas for trying out countless experimental
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* patches and reporting/debugging problems patiently!
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*
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* (c) 1999, Multiple IO-APIC support, developed by
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* Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
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* Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
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* further tested and cleaned up by Zach Brown <zab@redhat.com>
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* and Ingo Molnar <mingo@redhat.com>
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*
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* Fixes
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* Maciej W. Rozycki : Bits for genuine 82489DX APICs;
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* thanks to Eric Gilmore
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* and Rolf G. Tews
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* for testing these extensively
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* Paul Diefenbaugh : Added full ACPI support
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/mc146818rtc.h>
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#include <linux/compiler.h>
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/sysdev.h>
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#include <linux/msi.h>
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#include <linux/htirq.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/jiffies.h> /* time_after() */
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#include <linux/slab.h>
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#ifdef CONFIG_ACPI
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#include <acpi/acpi_bus.h>
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#endif
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#include <linux/bootmem.h>
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#include <linux/dmar.h>
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#include <linux/hpet.h>
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#include <asm/idle.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/cpu.h>
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#include <asm/desc.h>
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#include <asm/proto.h>
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#include <asm/acpi.h>
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#include <asm/dma.h>
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#include <asm/timer.h>
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#include <asm/i8259.h>
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#include <asm/nmi.h>
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#include <asm/msidef.h>
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#include <asm/hypertransport.h>
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#include <asm/setup.h>
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#include <asm/irq_remapping.h>
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#include <asm/hpet.h>
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#include <asm/hw_irq.h>
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#include <asm/apic.h>
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#define __apicdebuginit(type) static type __init
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#define for_each_irq_pin(entry, head) \
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for (entry = head; entry; entry = entry->next)
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/*
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* Is the SiS APIC rmw bug present ?
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* -1 = don't know, 0 = no, 1 = yes
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*/
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int sis_apic_bug = -1;
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static DEFINE_RAW_SPINLOCK(ioapic_lock);
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static DEFINE_RAW_SPINLOCK(vector_lock);
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/*
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* # of IRQ routing registers
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*/
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int nr_ioapic_registers[MAX_IO_APICS];
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/* I/O APIC entries */
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struct mpc_ioapic mp_ioapics[MAX_IO_APICS];
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int nr_ioapics;
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/* IO APIC gsi routing info */
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struct mp_ioapic_gsi mp_gsi_routing[MAX_IO_APICS];
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/* The one past the highest gsi number used */
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u32 gsi_top;
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/* MP IRQ source entries */
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struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
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/* # of MP IRQ source entries */
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int mp_irq_entries;
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/* GSI interrupts */
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static int nr_irqs_gsi = NR_IRQS_LEGACY;
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#if defined (CONFIG_MCA) || defined (CONFIG_EISA)
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int mp_bus_id_to_type[MAX_MP_BUSSES];
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#endif
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DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
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int skip_ioapic_setup;
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void arch_disable_smp_support(void)
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{
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#ifdef CONFIG_PCI
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noioapicquirk = 1;
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noioapicreroute = -1;
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#endif
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skip_ioapic_setup = 1;
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}
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static int __init parse_noapic(char *str)
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{
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/* disable IO-APIC */
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arch_disable_smp_support();
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return 0;
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}
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early_param("noapic", parse_noapic);
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struct irq_pin_list {
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int apic, pin;
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struct irq_pin_list *next;
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};
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static struct irq_pin_list *alloc_irq_pin_list(int node)
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{
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return kzalloc_node(sizeof(struct irq_pin_list), GFP_KERNEL, node);
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}
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/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
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#ifdef CONFIG_SPARSE_IRQ
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static struct irq_cfg irq_cfgx[NR_IRQS_LEGACY];
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#else
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static struct irq_cfg irq_cfgx[NR_IRQS];
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#endif
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int __init arch_early_irq_init(void)
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{
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struct irq_cfg *cfg;
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int count, node, i;
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if (!legacy_pic->nr_legacy_irqs) {
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nr_irqs_gsi = 0;
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io_apic_irqs = ~0UL;
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}
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cfg = irq_cfgx;
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count = ARRAY_SIZE(irq_cfgx);
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node = cpu_to_node(0);
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/* Make sure the legacy interrupts are marked in the bitmap */
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irq_reserve_irqs(0, legacy_pic->nr_legacy_irqs);
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for (i = 0; i < count; i++) {
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set_irq_chip_data(i, &cfg[i]);
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zalloc_cpumask_var_node(&cfg[i].domain, GFP_KERNEL, node);
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zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_KERNEL, node);
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/*
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* For legacy IRQ's, start with assigning irq0 to irq15 to
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* IRQ0_VECTOR to IRQ15_VECTOR on cpu 0.
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*/
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if (i < legacy_pic->nr_legacy_irqs) {
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cfg[i].vector = IRQ0_VECTOR + i;
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cpumask_set_cpu(0, cfg[i].domain);
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}
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}
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return 0;
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}
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#ifdef CONFIG_SPARSE_IRQ
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static struct irq_cfg *irq_cfg(unsigned int irq)
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{
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return get_irq_chip_data(irq);
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}
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static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
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{
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struct irq_cfg *cfg;
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cfg = kzalloc_node(sizeof(*cfg), GFP_KERNEL, node);
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if (!cfg)
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return NULL;
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if (!zalloc_cpumask_var_node(&cfg->domain, GFP_KERNEL, node))
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goto out_cfg;
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if (!zalloc_cpumask_var_node(&cfg->old_domain, GFP_KERNEL, node))
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goto out_domain;
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return cfg;
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out_domain:
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free_cpumask_var(cfg->domain);
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out_cfg:
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kfree(cfg);
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return NULL;
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}
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static void free_irq_cfg(unsigned int at, struct irq_cfg *cfg)
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{
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if (!cfg)
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return;
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set_irq_chip_data(at, NULL);
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free_cpumask_var(cfg->domain);
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free_cpumask_var(cfg->old_domain);
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kfree(cfg);
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}
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#else
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struct irq_cfg *irq_cfg(unsigned int irq)
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{
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return irq < nr_irqs ? irq_cfgx + irq : NULL;
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}
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static struct irq_cfg *alloc_irq_cfg(unsigned int irq, int node)
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{
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return irq_cfgx + irq;
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}
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static inline void free_irq_cfg(unsigned int at, struct irq_cfg *cfg) { }
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#endif
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static struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node)
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{
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int res = irq_alloc_desc_at(at, node);
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struct irq_cfg *cfg;
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if (res < 0) {
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if (res != -EEXIST)
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return NULL;
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cfg = get_irq_chip_data(at);
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if (cfg)
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return cfg;
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}
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cfg = alloc_irq_cfg(at, node);
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if (cfg)
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set_irq_chip_data(at, cfg);
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else
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irq_free_desc(at);
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return cfg;
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}
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static int alloc_irq_from(unsigned int from, int node)
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{
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return irq_alloc_desc_from(from, node);
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}
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static void free_irq_at(unsigned int at, struct irq_cfg *cfg)
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{
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free_irq_cfg(at, cfg);
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irq_free_desc(at);
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}
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struct io_apic {
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unsigned int index;
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unsigned int unused[3];
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unsigned int data;
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unsigned int unused2[11];
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unsigned int eoi;
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};
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static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
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{
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return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
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+ (mp_ioapics[idx].apicaddr & ~PAGE_MASK);
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}
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static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(vector, &io_apic->eoi);
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}
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static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(reg, &io_apic->index);
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return readl(&io_apic->data);
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}
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static inline void io_apic_write(unsigned int apic, unsigned int reg, unsigned int value)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(reg, &io_apic->index);
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writel(value, &io_apic->data);
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}
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/*
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* Re-write a value: to be used for read-modify-write
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* cycles where the read already set up the index register.
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*
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* Older SiS APIC requires we rewrite the index register
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*/
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static inline void io_apic_modify(unsigned int apic, unsigned int reg, unsigned int value)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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if (sis_apic_bug)
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writel(reg, &io_apic->index);
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writel(value, &io_apic->data);
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}
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static bool io_apic_level_ack_pending(struct irq_cfg *cfg)
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{
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struct irq_pin_list *entry;
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unsigned long flags;
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raw_spin_lock_irqsave(&ioapic_lock, flags);
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for_each_irq_pin(entry, cfg->irq_2_pin) {
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unsigned int reg;
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int pin;
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pin = entry->pin;
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reg = io_apic_read(entry->apic, 0x10 + pin*2);
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/* Is the remote IRR bit set? */
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if (reg & IO_APIC_REDIR_REMOTE_IRR) {
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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return true;
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}
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}
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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return false;
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}
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union entry_union {
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struct { u32 w1, w2; };
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struct IO_APIC_route_entry entry;
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};
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static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
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{
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union entry_union eu;
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unsigned long flags;
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raw_spin_lock_irqsave(&ioapic_lock, flags);
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eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
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eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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return eu.entry;
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}
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/*
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* When we write a new IO APIC routing entry, we need to write the high
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* word first! If the mask bit in the low word is clear, we will enable
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* the interrupt, and we need to make sure the entry is fully populated
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* before that happens.
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*/
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static void
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__ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
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{
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union entry_union eu = {{0, 0}};
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eu.entry = e;
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io_apic_write(apic, 0x11 + 2*pin, eu.w2);
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io_apic_write(apic, 0x10 + 2*pin, eu.w1);
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}
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static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&ioapic_lock, flags);
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__ioapic_write_entry(apic, pin, e);
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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/*
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* When we mask an IO APIC routing entry, we need to write the low
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* word first, in order to set the mask bit before we change the
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* high bits!
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*/
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static void ioapic_mask_entry(int apic, int pin)
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{
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unsigned long flags;
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union entry_union eu = { .entry.mask = 1 };
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raw_spin_lock_irqsave(&ioapic_lock, flags);
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io_apic_write(apic, 0x10 + 2*pin, eu.w1);
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io_apic_write(apic, 0x11 + 2*pin, eu.w2);
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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/*
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* The common case is 1:1 IRQ<->pin mappings. Sometimes there are
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* shared ISA-space IRQs, so we have to support them. We are super
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* fast in the common case, and fast for shared ISA-space IRQs.
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*/
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static int
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__add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
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{
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struct irq_pin_list **last, *entry;
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/* don't allow duplicates */
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last = &cfg->irq_2_pin;
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for_each_irq_pin(entry, cfg->irq_2_pin) {
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if (entry->apic == apic && entry->pin == pin)
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return 0;
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last = &entry->next;
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}
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entry = alloc_irq_pin_list(node);
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if (!entry) {
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printk(KERN_ERR "can not alloc irq_pin_list (%d,%d,%d)\n",
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node, apic, pin);
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return -ENOMEM;
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}
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entry->apic = apic;
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entry->pin = pin;
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*last = entry;
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return 0;
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}
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static void add_pin_to_irq_node(struct irq_cfg *cfg, int node, int apic, int pin)
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{
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if (__add_pin_to_irq_node(cfg, node, apic, pin))
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panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
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}
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/*
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* Reroute an IRQ to a different pin.
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*/
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static void __init replace_pin_at_irq_node(struct irq_cfg *cfg, int node,
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int oldapic, int oldpin,
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int newapic, int newpin)
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{
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struct irq_pin_list *entry;
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for_each_irq_pin(entry, cfg->irq_2_pin) {
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if (entry->apic == oldapic && entry->pin == oldpin) {
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entry->apic = newapic;
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entry->pin = newpin;
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/* every one is different, right? */
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return;
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}
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}
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/* old apic/pin didn't exist, so just add new ones */
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add_pin_to_irq_node(cfg, node, newapic, newpin);
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}
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static void __io_apic_modify_irq(struct irq_pin_list *entry,
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int mask_and, int mask_or,
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void (*final)(struct irq_pin_list *entry))
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{
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unsigned int reg, pin;
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pin = entry->pin;
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reg = io_apic_read(entry->apic, 0x10 + pin * 2);
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reg &= mask_and;
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reg |= mask_or;
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io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
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if (final)
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final(entry);
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}
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static void io_apic_modify_irq(struct irq_cfg *cfg,
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int mask_and, int mask_or,
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void (*final)(struct irq_pin_list *entry))
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{
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struct irq_pin_list *entry;
|
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for_each_irq_pin(entry, cfg->irq_2_pin)
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__io_apic_modify_irq(entry, mask_and, mask_or, final);
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}
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static void __mask_and_edge_IO_APIC_irq(struct irq_pin_list *entry)
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{
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__io_apic_modify_irq(entry, ~IO_APIC_REDIR_LEVEL_TRIGGER,
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IO_APIC_REDIR_MASKED, NULL);
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}
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|
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static void __unmask_and_level_IO_APIC_irq(struct irq_pin_list *entry)
|
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{
|
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__io_apic_modify_irq(entry, ~IO_APIC_REDIR_MASKED,
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IO_APIC_REDIR_LEVEL_TRIGGER, NULL);
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}
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|
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static void io_apic_sync(struct irq_pin_list *entry)
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{
|
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/*
|
|
* Synchronize the IO-APIC and the CPU by doing
|
|
* a dummy read from the IO-APIC
|
|
*/
|
|
struct io_apic __iomem *io_apic;
|
|
io_apic = io_apic_base(entry->apic);
|
|
readl(&io_apic->data);
|
|
}
|
|
|
|
static void mask_ioapic(struct irq_cfg *cfg)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_modify_irq(cfg, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
static void mask_ioapic_irq(struct irq_data *data)
|
|
{
|
|
mask_ioapic(data->chip_data);
|
|
}
|
|
|
|
static void __unmask_ioapic(struct irq_cfg *cfg)
|
|
{
|
|
io_apic_modify_irq(cfg, ~IO_APIC_REDIR_MASKED, 0, NULL);
|
|
}
|
|
|
|
static void unmask_ioapic(struct irq_cfg *cfg)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
__unmask_ioapic(cfg);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
static void unmask_ioapic_irq(struct irq_data *data)
|
|
{
|
|
unmask_ioapic(data->chip_data);
|
|
}
|
|
|
|
static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
/* Check delivery_mode to be sure we're not clearing an SMI pin */
|
|
entry = ioapic_read_entry(apic, pin);
|
|
if (entry.delivery_mode == dest_SMI)
|
|
return;
|
|
/*
|
|
* Disable it in the IO-APIC irq-routing table:
|
|
*/
|
|
ioapic_mask_entry(apic, pin);
|
|
}
|
|
|
|
static void clear_IO_APIC (void)
|
|
{
|
|
int apic, pin;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++)
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
|
|
clear_IO_APIC_pin(apic, pin);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
|
|
* specific CPU-side IRQs.
|
|
*/
|
|
|
|
#define MAX_PIRQS 8
|
|
static int pirq_entries[MAX_PIRQS] = {
|
|
[0 ... MAX_PIRQS - 1] = -1
|
|
};
|
|
|
|
static int __init ioapic_pirq_setup(char *str)
|
|
{
|
|
int i, max;
|
|
int ints[MAX_PIRQS+1];
|
|
|
|
get_options(str, ARRAY_SIZE(ints), ints);
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"PIRQ redirection, working around broken MP-BIOS.\n");
|
|
max = MAX_PIRQS;
|
|
if (ints[0] < MAX_PIRQS)
|
|
max = ints[0];
|
|
|
|
for (i = 0; i < max; i++) {
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
|
|
/*
|
|
* PIRQs are mapped upside down, usually.
|
|
*/
|
|
pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
__setup("pirq=", ioapic_pirq_setup);
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
struct IO_APIC_route_entry **alloc_ioapic_entries(void)
|
|
{
|
|
int apic;
|
|
struct IO_APIC_route_entry **ioapic_entries;
|
|
|
|
ioapic_entries = kzalloc(sizeof(*ioapic_entries) * nr_ioapics,
|
|
GFP_KERNEL);
|
|
if (!ioapic_entries)
|
|
return 0;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
ioapic_entries[apic] =
|
|
kzalloc(sizeof(struct IO_APIC_route_entry) *
|
|
nr_ioapic_registers[apic], GFP_KERNEL);
|
|
if (!ioapic_entries[apic])
|
|
goto nomem;
|
|
}
|
|
|
|
return ioapic_entries;
|
|
|
|
nomem:
|
|
while (--apic >= 0)
|
|
kfree(ioapic_entries[apic]);
|
|
kfree(ioapic_entries);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Saves all the IO-APIC RTE's
|
|
*/
|
|
int save_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
|
|
{
|
|
int apic, pin;
|
|
|
|
if (!ioapic_entries)
|
|
return -ENOMEM;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
if (!ioapic_entries[apic])
|
|
return -ENOMEM;
|
|
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
|
|
ioapic_entries[apic][pin] =
|
|
ioapic_read_entry(apic, pin);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Mask all IO APIC entries.
|
|
*/
|
|
void mask_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
|
|
{
|
|
int apic, pin;
|
|
|
|
if (!ioapic_entries)
|
|
return;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
if (!ioapic_entries[apic])
|
|
break;
|
|
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
entry = ioapic_entries[apic][pin];
|
|
if (!entry.mask) {
|
|
entry.mask = 1;
|
|
ioapic_write_entry(apic, pin, entry);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restore IO APIC entries which was saved in ioapic_entries.
|
|
*/
|
|
int restore_IO_APIC_setup(struct IO_APIC_route_entry **ioapic_entries)
|
|
{
|
|
int apic, pin;
|
|
|
|
if (!ioapic_entries)
|
|
return -ENOMEM;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
if (!ioapic_entries[apic])
|
|
return -ENOMEM;
|
|
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
|
|
ioapic_write_entry(apic, pin,
|
|
ioapic_entries[apic][pin]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void free_ioapic_entries(struct IO_APIC_route_entry **ioapic_entries)
|
|
{
|
|
int apic;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++)
|
|
kfree(ioapic_entries[apic]);
|
|
|
|
kfree(ioapic_entries);
|
|
}
|
|
|
|
/*
|
|
* Find the IRQ entry number of a certain pin.
|
|
*/
|
|
static int find_irq_entry(int apic, int pin, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++)
|
|
if (mp_irqs[i].irqtype == type &&
|
|
(mp_irqs[i].dstapic == mp_ioapics[apic].apicid ||
|
|
mp_irqs[i].dstapic == MP_APIC_ALL) &&
|
|
mp_irqs[i].dstirq == pin)
|
|
return i;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Find the pin to which IRQ[irq] (ISA) is connected
|
|
*/
|
|
static int __init find_isa_irq_pin(int irq, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].srcbus;
|
|
|
|
if (test_bit(lbus, mp_bus_not_pci) &&
|
|
(mp_irqs[i].irqtype == type) &&
|
|
(mp_irqs[i].srcbusirq == irq))
|
|
|
|
return mp_irqs[i].dstirq;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int __init find_isa_irq_apic(int irq, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].srcbus;
|
|
|
|
if (test_bit(lbus, mp_bus_not_pci) &&
|
|
(mp_irqs[i].irqtype == type) &&
|
|
(mp_irqs[i].srcbusirq == irq))
|
|
break;
|
|
}
|
|
if (i < mp_irq_entries) {
|
|
int apic;
|
|
for(apic = 0; apic < nr_ioapics; apic++) {
|
|
if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic)
|
|
return apic;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
|
|
/*
|
|
* EISA Edge/Level control register, ELCR
|
|
*/
|
|
static int EISA_ELCR(unsigned int irq)
|
|
{
|
|
if (irq < legacy_pic->nr_legacy_irqs) {
|
|
unsigned int port = 0x4d0 + (irq >> 3);
|
|
return (inb(port) >> (irq & 7)) & 1;
|
|
}
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"Broken MPtable reports ISA irq %d\n", irq);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* ISA interrupts are always polarity zero edge triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_ISA_trigger(idx) (0)
|
|
#define default_ISA_polarity(idx) (0)
|
|
|
|
/* EISA interrupts are always polarity zero and can be edge or level
|
|
* trigger depending on the ELCR value. If an interrupt is listed as
|
|
* EISA conforming in the MP table, that means its trigger type must
|
|
* be read in from the ELCR */
|
|
|
|
#define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
|
|
#define default_EISA_polarity(idx) default_ISA_polarity(idx)
|
|
|
|
/* PCI interrupts are always polarity one level triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_PCI_trigger(idx) (1)
|
|
#define default_PCI_polarity(idx) (1)
|
|
|
|
/* MCA interrupts are always polarity zero level triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_MCA_trigger(idx) (1)
|
|
#define default_MCA_polarity(idx) default_ISA_polarity(idx)
|
|
|
|
static int MPBIOS_polarity(int idx)
|
|
{
|
|
int bus = mp_irqs[idx].srcbus;
|
|
int polarity;
|
|
|
|
/*
|
|
* Determine IRQ line polarity (high active or low active):
|
|
*/
|
|
switch (mp_irqs[idx].irqflag & 3)
|
|
{
|
|
case 0: /* conforms, ie. bus-type dependent polarity */
|
|
if (test_bit(bus, mp_bus_not_pci))
|
|
polarity = default_ISA_polarity(idx);
|
|
else
|
|
polarity = default_PCI_polarity(idx);
|
|
break;
|
|
case 1: /* high active */
|
|
{
|
|
polarity = 0;
|
|
break;
|
|
}
|
|
case 2: /* reserved */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
polarity = 1;
|
|
break;
|
|
}
|
|
case 3: /* low active */
|
|
{
|
|
polarity = 1;
|
|
break;
|
|
}
|
|
default: /* invalid */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
polarity = 1;
|
|
break;
|
|
}
|
|
}
|
|
return polarity;
|
|
}
|
|
|
|
static int MPBIOS_trigger(int idx)
|
|
{
|
|
int bus = mp_irqs[idx].srcbus;
|
|
int trigger;
|
|
|
|
/*
|
|
* Determine IRQ trigger mode (edge or level sensitive):
|
|
*/
|
|
switch ((mp_irqs[idx].irqflag>>2) & 3)
|
|
{
|
|
case 0: /* conforms, ie. bus-type dependent */
|
|
if (test_bit(bus, mp_bus_not_pci))
|
|
trigger = default_ISA_trigger(idx);
|
|
else
|
|
trigger = default_PCI_trigger(idx);
|
|
#if defined(CONFIG_EISA) || defined(CONFIG_MCA)
|
|
switch (mp_bus_id_to_type[bus]) {
|
|
case MP_BUS_ISA: /* ISA pin */
|
|
{
|
|
/* set before the switch */
|
|
break;
|
|
}
|
|
case MP_BUS_EISA: /* EISA pin */
|
|
{
|
|
trigger = default_EISA_trigger(idx);
|
|
break;
|
|
}
|
|
case MP_BUS_PCI: /* PCI pin */
|
|
{
|
|
/* set before the switch */
|
|
break;
|
|
}
|
|
case MP_BUS_MCA: /* MCA pin */
|
|
{
|
|
trigger = default_MCA_trigger(idx);
|
|
break;
|
|
}
|
|
default:
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
trigger = 1;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
break;
|
|
case 1: /* edge */
|
|
{
|
|
trigger = 0;
|
|
break;
|
|
}
|
|
case 2: /* reserved */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
trigger = 1;
|
|
break;
|
|
}
|
|
case 3: /* level */
|
|
{
|
|
trigger = 1;
|
|
break;
|
|
}
|
|
default: /* invalid */
|
|
{
|
|
printk(KERN_WARNING "broken BIOS!!\n");
|
|
trigger = 0;
|
|
break;
|
|
}
|
|
}
|
|
return trigger;
|
|
}
|
|
|
|
static inline int irq_polarity(int idx)
|
|
{
|
|
return MPBIOS_polarity(idx);
|
|
}
|
|
|
|
static inline int irq_trigger(int idx)
|
|
{
|
|
return MPBIOS_trigger(idx);
|
|
}
|
|
|
|
static int pin_2_irq(int idx, int apic, int pin)
|
|
{
|
|
int irq;
|
|
int bus = mp_irqs[idx].srcbus;
|
|
|
|
/*
|
|
* Debugging check, we are in big trouble if this message pops up!
|
|
*/
|
|
if (mp_irqs[idx].dstirq != pin)
|
|
printk(KERN_ERR "broken BIOS or MPTABLE parser, ayiee!!\n");
|
|
|
|
if (test_bit(bus, mp_bus_not_pci)) {
|
|
irq = mp_irqs[idx].srcbusirq;
|
|
} else {
|
|
u32 gsi = mp_gsi_routing[apic].gsi_base + pin;
|
|
|
|
if (gsi >= NR_IRQS_LEGACY)
|
|
irq = gsi;
|
|
else
|
|
irq = gsi_top + gsi;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* PCI IRQ command line redirection. Yes, limits are hardcoded.
|
|
*/
|
|
if ((pin >= 16) && (pin <= 23)) {
|
|
if (pirq_entries[pin-16] != -1) {
|
|
if (!pirq_entries[pin-16]) {
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"disabling PIRQ%d\n", pin-16);
|
|
} else {
|
|
irq = pirq_entries[pin-16];
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"using PIRQ%d -> IRQ %d\n",
|
|
pin-16, irq);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return irq;
|
|
}
|
|
|
|
/*
|
|
* Find a specific PCI IRQ entry.
|
|
* Not an __init, possibly needed by modules
|
|
*/
|
|
int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
|
|
struct io_apic_irq_attr *irq_attr)
|
|
{
|
|
int apic, i, best_guess = -1;
|
|
|
|
apic_printk(APIC_DEBUG,
|
|
"querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
|
|
bus, slot, pin);
|
|
if (test_bit(bus, mp_bus_not_pci)) {
|
|
apic_printk(APIC_VERBOSE,
|
|
"PCI BIOS passed nonexistent PCI bus %d!\n", bus);
|
|
return -1;
|
|
}
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].srcbus;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++)
|
|
if (mp_ioapics[apic].apicid == mp_irqs[i].dstapic ||
|
|
mp_irqs[i].dstapic == MP_APIC_ALL)
|
|
break;
|
|
|
|
if (!test_bit(lbus, mp_bus_not_pci) &&
|
|
!mp_irqs[i].irqtype &&
|
|
(bus == lbus) &&
|
|
(slot == ((mp_irqs[i].srcbusirq >> 2) & 0x1f))) {
|
|
int irq = pin_2_irq(i, apic, mp_irqs[i].dstirq);
|
|
|
|
if (!(apic || IO_APIC_IRQ(irq)))
|
|
continue;
|
|
|
|
if (pin == (mp_irqs[i].srcbusirq & 3)) {
|
|
set_io_apic_irq_attr(irq_attr, apic,
|
|
mp_irqs[i].dstirq,
|
|
irq_trigger(i),
|
|
irq_polarity(i));
|
|
return irq;
|
|
}
|
|
/*
|
|
* Use the first all-but-pin matching entry as a
|
|
* best-guess fuzzy result for broken mptables.
|
|
*/
|
|
if (best_guess < 0) {
|
|
set_io_apic_irq_attr(irq_attr, apic,
|
|
mp_irqs[i].dstirq,
|
|
irq_trigger(i),
|
|
irq_polarity(i));
|
|
best_guess = irq;
|
|
}
|
|
}
|
|
}
|
|
return best_guess;
|
|
}
|
|
EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
|
|
|
|
void lock_vector_lock(void)
|
|
{
|
|
/* Used to the online set of cpus does not change
|
|
* during assign_irq_vector.
|
|
*/
|
|
raw_spin_lock(&vector_lock);
|
|
}
|
|
|
|
void unlock_vector_lock(void)
|
|
{
|
|
raw_spin_unlock(&vector_lock);
|
|
}
|
|
|
|
static int
|
|
__assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
|
|
{
|
|
/*
|
|
* NOTE! The local APIC isn't very good at handling
|
|
* multiple interrupts at the same interrupt level.
|
|
* As the interrupt level is determined by taking the
|
|
* vector number and shifting that right by 4, we
|
|
* want to spread these out a bit so that they don't
|
|
* all fall in the same interrupt level.
|
|
*
|
|
* Also, we've got to be careful not to trash gate
|
|
* 0x80, because int 0x80 is hm, kind of importantish. ;)
|
|
*/
|
|
static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
|
|
static int current_offset = VECTOR_OFFSET_START % 8;
|
|
unsigned int old_vector;
|
|
int cpu, err;
|
|
cpumask_var_t tmp_mask;
|
|
|
|
if (cfg->move_in_progress)
|
|
return -EBUSY;
|
|
|
|
if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
|
|
return -ENOMEM;
|
|
|
|
old_vector = cfg->vector;
|
|
if (old_vector) {
|
|
cpumask_and(tmp_mask, mask, cpu_online_mask);
|
|
cpumask_and(tmp_mask, cfg->domain, tmp_mask);
|
|
if (!cpumask_empty(tmp_mask)) {
|
|
free_cpumask_var(tmp_mask);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Only try and allocate irqs on cpus that are present */
|
|
err = -ENOSPC;
|
|
for_each_cpu_and(cpu, mask, cpu_online_mask) {
|
|
int new_cpu;
|
|
int vector, offset;
|
|
|
|
apic->vector_allocation_domain(cpu, tmp_mask);
|
|
|
|
vector = current_vector;
|
|
offset = current_offset;
|
|
next:
|
|
vector += 8;
|
|
if (vector >= first_system_vector) {
|
|
/* If out of vectors on large boxen, must share them. */
|
|
offset = (offset + 1) % 8;
|
|
vector = FIRST_EXTERNAL_VECTOR + offset;
|
|
}
|
|
if (unlikely(current_vector == vector))
|
|
continue;
|
|
|
|
if (test_bit(vector, used_vectors))
|
|
goto next;
|
|
|
|
for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
|
|
if (per_cpu(vector_irq, new_cpu)[vector] != -1)
|
|
goto next;
|
|
/* Found one! */
|
|
current_vector = vector;
|
|
current_offset = offset;
|
|
if (old_vector) {
|
|
cfg->move_in_progress = 1;
|
|
cpumask_copy(cfg->old_domain, cfg->domain);
|
|
}
|
|
for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
|
|
per_cpu(vector_irq, new_cpu)[vector] = irq;
|
|
cfg->vector = vector;
|
|
cpumask_copy(cfg->domain, tmp_mask);
|
|
err = 0;
|
|
break;
|
|
}
|
|
free_cpumask_var(tmp_mask);
|
|
return err;
|
|
}
|
|
|
|
int assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
|
|
{
|
|
int err;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&vector_lock, flags);
|
|
err = __assign_irq_vector(irq, cfg, mask);
|
|
raw_spin_unlock_irqrestore(&vector_lock, flags);
|
|
return err;
|
|
}
|
|
|
|
static void __clear_irq_vector(int irq, struct irq_cfg *cfg)
|
|
{
|
|
int cpu, vector;
|
|
|
|
BUG_ON(!cfg->vector);
|
|
|
|
vector = cfg->vector;
|
|
for_each_cpu_and(cpu, cfg->domain, cpu_online_mask)
|
|
per_cpu(vector_irq, cpu)[vector] = -1;
|
|
|
|
cfg->vector = 0;
|
|
cpumask_clear(cfg->domain);
|
|
|
|
if (likely(!cfg->move_in_progress))
|
|
return;
|
|
for_each_cpu_and(cpu, cfg->old_domain, cpu_online_mask) {
|
|
for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS;
|
|
vector++) {
|
|
if (per_cpu(vector_irq, cpu)[vector] != irq)
|
|
continue;
|
|
per_cpu(vector_irq, cpu)[vector] = -1;
|
|
break;
|
|
}
|
|
}
|
|
cfg->move_in_progress = 0;
|
|
}
|
|
|
|
void __setup_vector_irq(int cpu)
|
|
{
|
|
/* Initialize vector_irq on a new cpu */
|
|
int irq, vector;
|
|
struct irq_cfg *cfg;
|
|
|
|
/*
|
|
* vector_lock will make sure that we don't run into irq vector
|
|
* assignments that might be happening on another cpu in parallel,
|
|
* while we setup our initial vector to irq mappings.
|
|
*/
|
|
raw_spin_lock(&vector_lock);
|
|
/* Mark the inuse vectors */
|
|
for_each_active_irq(irq) {
|
|
cfg = get_irq_chip_data(irq);
|
|
if (!cfg)
|
|
continue;
|
|
/*
|
|
* If it is a legacy IRQ handled by the legacy PIC, this cpu
|
|
* will be part of the irq_cfg's domain.
|
|
*/
|
|
if (irq < legacy_pic->nr_legacy_irqs && !IO_APIC_IRQ(irq))
|
|
cpumask_set_cpu(cpu, cfg->domain);
|
|
|
|
if (!cpumask_test_cpu(cpu, cfg->domain))
|
|
continue;
|
|
vector = cfg->vector;
|
|
per_cpu(vector_irq, cpu)[vector] = irq;
|
|
}
|
|
/* Mark the free vectors */
|
|
for (vector = 0; vector < NR_VECTORS; ++vector) {
|
|
irq = per_cpu(vector_irq, cpu)[vector];
|
|
if (irq < 0)
|
|
continue;
|
|
|
|
cfg = irq_cfg(irq);
|
|
if (!cpumask_test_cpu(cpu, cfg->domain))
|
|
per_cpu(vector_irq, cpu)[vector] = -1;
|
|
}
|
|
raw_spin_unlock(&vector_lock);
|
|
}
|
|
|
|
static struct irq_chip ioapic_chip;
|
|
static struct irq_chip ir_ioapic_chip;
|
|
|
|
#define IOAPIC_AUTO -1
|
|
#define IOAPIC_EDGE 0
|
|
#define IOAPIC_LEVEL 1
|
|
|
|
#ifdef CONFIG_X86_32
|
|
static inline int IO_APIC_irq_trigger(int irq)
|
|
{
|
|
int apic, idx, pin;
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
|
|
idx = find_irq_entry(apic, pin, mp_INT);
|
|
if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
|
|
return irq_trigger(idx);
|
|
}
|
|
}
|
|
/*
|
|
* nonexistent IRQs are edge default
|
|
*/
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int IO_APIC_irq_trigger(int irq)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
static void ioapic_register_intr(unsigned int irq, unsigned long trigger)
|
|
{
|
|
|
|
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
|
|
trigger == IOAPIC_LEVEL)
|
|
irq_set_status_flags(irq, IRQ_LEVEL);
|
|
else
|
|
irq_clear_status_flags(irq, IRQ_LEVEL);
|
|
|
|
if (irq_remapped(get_irq_chip_data(irq))) {
|
|
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
|
|
if (trigger)
|
|
set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
|
|
handle_fasteoi_irq,
|
|
"fasteoi");
|
|
else
|
|
set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
|
|
handle_edge_irq, "edge");
|
|
return;
|
|
}
|
|
|
|
if ((trigger == IOAPIC_AUTO && IO_APIC_irq_trigger(irq)) ||
|
|
trigger == IOAPIC_LEVEL)
|
|
set_irq_chip_and_handler_name(irq, &ioapic_chip,
|
|
handle_fasteoi_irq,
|
|
"fasteoi");
|
|
else
|
|
set_irq_chip_and_handler_name(irq, &ioapic_chip,
|
|
handle_edge_irq, "edge");
|
|
}
|
|
|
|
static int setup_ioapic_entry(int apic_id, int irq,
|
|
struct IO_APIC_route_entry *entry,
|
|
unsigned int destination, int trigger,
|
|
int polarity, int vector, int pin)
|
|
{
|
|
/*
|
|
* add it to the IO-APIC irq-routing table:
|
|
*/
|
|
memset(entry,0,sizeof(*entry));
|
|
|
|
if (intr_remapping_enabled) {
|
|
struct intel_iommu *iommu = map_ioapic_to_ir(apic_id);
|
|
struct irte irte;
|
|
struct IR_IO_APIC_route_entry *ir_entry =
|
|
(struct IR_IO_APIC_route_entry *) entry;
|
|
int index;
|
|
|
|
if (!iommu)
|
|
panic("No mapping iommu for ioapic %d\n", apic_id);
|
|
|
|
index = alloc_irte(iommu, irq, 1);
|
|
if (index < 0)
|
|
panic("Failed to allocate IRTE for ioapic %d\n", apic_id);
|
|
|
|
prepare_irte(&irte, vector, destination);
|
|
|
|
/* Set source-id of interrupt request */
|
|
set_ioapic_sid(&irte, apic_id);
|
|
|
|
modify_irte(irq, &irte);
|
|
|
|
ir_entry->index2 = (index >> 15) & 0x1;
|
|
ir_entry->zero = 0;
|
|
ir_entry->format = 1;
|
|
ir_entry->index = (index & 0x7fff);
|
|
/*
|
|
* IO-APIC RTE will be configured with virtual vector.
|
|
* irq handler will do the explicit EOI to the io-apic.
|
|
*/
|
|
ir_entry->vector = pin;
|
|
} else {
|
|
entry->delivery_mode = apic->irq_delivery_mode;
|
|
entry->dest_mode = apic->irq_dest_mode;
|
|
entry->dest = destination;
|
|
entry->vector = vector;
|
|
}
|
|
|
|
entry->mask = 0; /* enable IRQ */
|
|
entry->trigger = trigger;
|
|
entry->polarity = polarity;
|
|
|
|
/* Mask level triggered irqs.
|
|
* Use IRQ_DELAYED_DISABLE for edge triggered irqs.
|
|
*/
|
|
if (trigger)
|
|
entry->mask = 1;
|
|
return 0;
|
|
}
|
|
|
|
static void setup_ioapic_irq(int apic_id, int pin, unsigned int irq,
|
|
struct irq_cfg *cfg, int trigger, int polarity)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
unsigned int dest;
|
|
|
|
if (!IO_APIC_IRQ(irq))
|
|
return;
|
|
/*
|
|
* For legacy irqs, cfg->domain starts with cpu 0 for legacy
|
|
* controllers like 8259. Now that IO-APIC can handle this irq, update
|
|
* the cfg->domain.
|
|
*/
|
|
if (irq < legacy_pic->nr_legacy_irqs && cpumask_test_cpu(0, cfg->domain))
|
|
apic->vector_allocation_domain(0, cfg->domain);
|
|
|
|
if (assign_irq_vector(irq, cfg, apic->target_cpus()))
|
|
return;
|
|
|
|
dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
|
|
|
|
apic_printk(APIC_VERBOSE,KERN_DEBUG
|
|
"IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> "
|
|
"IRQ %d Mode:%i Active:%i)\n",
|
|
apic_id, mp_ioapics[apic_id].apicid, pin, cfg->vector,
|
|
irq, trigger, polarity);
|
|
|
|
|
|
if (setup_ioapic_entry(mp_ioapics[apic_id].apicid, irq, &entry,
|
|
dest, trigger, polarity, cfg->vector, pin)) {
|
|
printk("Failed to setup ioapic entry for ioapic %d, pin %d\n",
|
|
mp_ioapics[apic_id].apicid, pin);
|
|
__clear_irq_vector(irq, cfg);
|
|
return;
|
|
}
|
|
|
|
ioapic_register_intr(irq, trigger);
|
|
if (irq < legacy_pic->nr_legacy_irqs)
|
|
legacy_pic->mask(irq);
|
|
|
|
ioapic_write_entry(apic_id, pin, entry);
|
|
}
|
|
|
|
static struct {
|
|
DECLARE_BITMAP(pin_programmed, MP_MAX_IOAPIC_PIN + 1);
|
|
} mp_ioapic_routing[MAX_IO_APICS];
|
|
|
|
static void __init setup_IO_APIC_irqs(void)
|
|
{
|
|
int apic_id, pin, idx, irq, notcon = 0;
|
|
int node = cpu_to_node(0);
|
|
struct irq_cfg *cfg;
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
|
|
|
|
for (apic_id = 0; apic_id < nr_ioapics; apic_id++)
|
|
for (pin = 0; pin < nr_ioapic_registers[apic_id]; pin++) {
|
|
idx = find_irq_entry(apic_id, pin, mp_INT);
|
|
if (idx == -1) {
|
|
if (!notcon) {
|
|
notcon = 1;
|
|
apic_printk(APIC_VERBOSE,
|
|
KERN_DEBUG " %d-%d",
|
|
mp_ioapics[apic_id].apicid, pin);
|
|
} else
|
|
apic_printk(APIC_VERBOSE, " %d-%d",
|
|
mp_ioapics[apic_id].apicid, pin);
|
|
continue;
|
|
}
|
|
if (notcon) {
|
|
apic_printk(APIC_VERBOSE,
|
|
" (apicid-pin) not connected\n");
|
|
notcon = 0;
|
|
}
|
|
|
|
irq = pin_2_irq(idx, apic_id, pin);
|
|
|
|
if ((apic_id > 0) && (irq > 16))
|
|
continue;
|
|
|
|
/*
|
|
* Skip the timer IRQ if there's a quirk handler
|
|
* installed and if it returns 1:
|
|
*/
|
|
if (apic->multi_timer_check &&
|
|
apic->multi_timer_check(apic_id, irq))
|
|
continue;
|
|
|
|
cfg = alloc_irq_and_cfg_at(irq, node);
|
|
if (!cfg)
|
|
continue;
|
|
|
|
add_pin_to_irq_node(cfg, node, apic_id, pin);
|
|
/*
|
|
* don't mark it in pin_programmed, so later acpi could
|
|
* set it correctly when irq < 16
|
|
*/
|
|
setup_ioapic_irq(apic_id, pin, irq, cfg, irq_trigger(idx),
|
|
irq_polarity(idx));
|
|
}
|
|
|
|
if (notcon)
|
|
apic_printk(APIC_VERBOSE,
|
|
" (apicid-pin) not connected\n");
|
|
}
|
|
|
|
/*
|
|
* for the gsit that is not in first ioapic
|
|
* but could not use acpi_register_gsi()
|
|
* like some special sci in IBM x3330
|
|
*/
|
|
void setup_IO_APIC_irq_extra(u32 gsi)
|
|
{
|
|
int apic_id = 0, pin, idx, irq, node = cpu_to_node(0);
|
|
struct irq_cfg *cfg;
|
|
|
|
/*
|
|
* Convert 'gsi' to 'ioapic.pin'.
|
|
*/
|
|
apic_id = mp_find_ioapic(gsi);
|
|
if (apic_id < 0)
|
|
return;
|
|
|
|
pin = mp_find_ioapic_pin(apic_id, gsi);
|
|
idx = find_irq_entry(apic_id, pin, mp_INT);
|
|
if (idx == -1)
|
|
return;
|
|
|
|
irq = pin_2_irq(idx, apic_id, pin);
|
|
|
|
/* Only handle the non legacy irqs on secondary ioapics */
|
|
if (apic_id == 0 || irq < NR_IRQS_LEGACY)
|
|
return;
|
|
|
|
cfg = alloc_irq_and_cfg_at(irq, node);
|
|
if (!cfg)
|
|
return;
|
|
|
|
add_pin_to_irq_node(cfg, node, apic_id, pin);
|
|
|
|
if (test_bit(pin, mp_ioapic_routing[apic_id].pin_programmed)) {
|
|
pr_debug("Pin %d-%d already programmed\n",
|
|
mp_ioapics[apic_id].apicid, pin);
|
|
return;
|
|
}
|
|
set_bit(pin, mp_ioapic_routing[apic_id].pin_programmed);
|
|
|
|
setup_ioapic_irq(apic_id, pin, irq, cfg,
|
|
irq_trigger(idx), irq_polarity(idx));
|
|
}
|
|
|
|
/*
|
|
* Set up the timer pin, possibly with the 8259A-master behind.
|
|
*/
|
|
static void __init setup_timer_IRQ0_pin(unsigned int apic_id, unsigned int pin,
|
|
int vector)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
if (intr_remapping_enabled)
|
|
return;
|
|
|
|
memset(&entry, 0, sizeof(entry));
|
|
|
|
/*
|
|
* We use logical delivery to get the timer IRQ
|
|
* to the first CPU.
|
|
*/
|
|
entry.dest_mode = apic->irq_dest_mode;
|
|
entry.mask = 0; /* don't mask IRQ for edge */
|
|
entry.dest = apic->cpu_mask_to_apicid(apic->target_cpus());
|
|
entry.delivery_mode = apic->irq_delivery_mode;
|
|
entry.polarity = 0;
|
|
entry.trigger = 0;
|
|
entry.vector = vector;
|
|
|
|
/*
|
|
* The timer IRQ doesn't have to know that behind the
|
|
* scene we may have a 8259A-master in AEOI mode ...
|
|
*/
|
|
set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
|
|
|
|
/*
|
|
* Add it to the IO-APIC irq-routing table:
|
|
*/
|
|
ioapic_write_entry(apic_id, pin, entry);
|
|
}
|
|
|
|
|
|
__apicdebuginit(void) print_IO_APIC(void)
|
|
{
|
|
int apic, i;
|
|
union IO_APIC_reg_00 reg_00;
|
|
union IO_APIC_reg_01 reg_01;
|
|
union IO_APIC_reg_02 reg_02;
|
|
union IO_APIC_reg_03 reg_03;
|
|
unsigned long flags;
|
|
struct irq_cfg *cfg;
|
|
unsigned int irq;
|
|
|
|
printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
|
|
for (i = 0; i < nr_ioapics; i++)
|
|
printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
|
|
mp_ioapics[i].apicid, nr_ioapic_registers[i]);
|
|
|
|
/*
|
|
* We are a bit conservative about what we expect. We have to
|
|
* know about every hardware change ASAP.
|
|
*/
|
|
printk(KERN_INFO "testing the IO APIC.......................\n");
|
|
|
|
for (apic = 0; apic < nr_ioapics; apic++) {
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(apic, 0);
|
|
reg_01.raw = io_apic_read(apic, 1);
|
|
if (reg_01.bits.version >= 0x10)
|
|
reg_02.raw = io_apic_read(apic, 2);
|
|
if (reg_01.bits.version >= 0x20)
|
|
reg_03.raw = io_apic_read(apic, 3);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
printk("\n");
|
|
printk(KERN_DEBUG "IO APIC #%d......\n", mp_ioapics[apic].apicid);
|
|
printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
|
|
printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
|
|
printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
|
|
printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
|
|
|
|
printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
|
|
printk(KERN_DEBUG "....... : max redirection entries: %04X\n", reg_01.bits.entries);
|
|
|
|
printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
|
|
printk(KERN_DEBUG "....... : IO APIC version: %04X\n", reg_01.bits.version);
|
|
|
|
/*
|
|
* Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
|
|
* but the value of reg_02 is read as the previous read register
|
|
* value, so ignore it if reg_02 == reg_01.
|
|
*/
|
|
if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
|
|
printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
|
|
printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
|
|
}
|
|
|
|
/*
|
|
* Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
|
|
* or reg_03, but the value of reg_0[23] is read as the previous read
|
|
* register value, so ignore it if reg_03 == reg_0[12].
|
|
*/
|
|
if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
|
|
reg_03.raw != reg_01.raw) {
|
|
printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
|
|
printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
|
|
}
|
|
|
|
printk(KERN_DEBUG ".... IRQ redirection table:\n");
|
|
|
|
printk(KERN_DEBUG " NR Dst Mask Trig IRR Pol"
|
|
" Stat Dmod Deli Vect:\n");
|
|
|
|
for (i = 0; i <= reg_01.bits.entries; i++) {
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
entry = ioapic_read_entry(apic, i);
|
|
|
|
printk(KERN_DEBUG " %02x %03X ",
|
|
i,
|
|
entry.dest
|
|
);
|
|
|
|
printk("%1d %1d %1d %1d %1d %1d %1d %02X\n",
|
|
entry.mask,
|
|
entry.trigger,
|
|
entry.irr,
|
|
entry.polarity,
|
|
entry.delivery_status,
|
|
entry.dest_mode,
|
|
entry.delivery_mode,
|
|
entry.vector
|
|
);
|
|
}
|
|
}
|
|
printk(KERN_DEBUG "IRQ to pin mappings:\n");
|
|
for_each_active_irq(irq) {
|
|
struct irq_pin_list *entry;
|
|
|
|
cfg = get_irq_chip_data(irq);
|
|
if (!cfg)
|
|
continue;
|
|
entry = cfg->irq_2_pin;
|
|
if (!entry)
|
|
continue;
|
|
printk(KERN_DEBUG "IRQ%d ", irq);
|
|
for_each_irq_pin(entry, cfg->irq_2_pin)
|
|
printk("-> %d:%d", entry->apic, entry->pin);
|
|
printk("\n");
|
|
}
|
|
|
|
printk(KERN_INFO ".................................... done.\n");
|
|
|
|
return;
|
|
}
|
|
|
|
__apicdebuginit(void) print_APIC_field(int base)
|
|
{
|
|
int i;
|
|
|
|
printk(KERN_DEBUG);
|
|
|
|
for (i = 0; i < 8; i++)
|
|
printk(KERN_CONT "%08x", apic_read(base + i*0x10));
|
|
|
|
printk(KERN_CONT "\n");
|
|
}
|
|
|
|
__apicdebuginit(void) print_local_APIC(void *dummy)
|
|
{
|
|
unsigned int i, v, ver, maxlvt;
|
|
u64 icr;
|
|
|
|
printk(KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
|
|
smp_processor_id(), hard_smp_processor_id());
|
|
v = apic_read(APIC_ID);
|
|
printk(KERN_INFO "... APIC ID: %08x (%01x)\n", v, read_apic_id());
|
|
v = apic_read(APIC_LVR);
|
|
printk(KERN_INFO "... APIC VERSION: %08x\n", v);
|
|
ver = GET_APIC_VERSION(v);
|
|
maxlvt = lapic_get_maxlvt();
|
|
|
|
v = apic_read(APIC_TASKPRI);
|
|
printk(KERN_DEBUG "... APIC TASKPRI: %08x (%02x)\n", v, v & APIC_TPRI_MASK);
|
|
|
|
if (APIC_INTEGRATED(ver)) { /* !82489DX */
|
|
if (!APIC_XAPIC(ver)) {
|
|
v = apic_read(APIC_ARBPRI);
|
|
printk(KERN_DEBUG "... APIC ARBPRI: %08x (%02x)\n", v,
|
|
v & APIC_ARBPRI_MASK);
|
|
}
|
|
v = apic_read(APIC_PROCPRI);
|
|
printk(KERN_DEBUG "... APIC PROCPRI: %08x\n", v);
|
|
}
|
|
|
|
/*
|
|
* Remote read supported only in the 82489DX and local APIC for
|
|
* Pentium processors.
|
|
*/
|
|
if (!APIC_INTEGRATED(ver) || maxlvt == 3) {
|
|
v = apic_read(APIC_RRR);
|
|
printk(KERN_DEBUG "... APIC RRR: %08x\n", v);
|
|
}
|
|
|
|
v = apic_read(APIC_LDR);
|
|
printk(KERN_DEBUG "... APIC LDR: %08x\n", v);
|
|
if (!x2apic_enabled()) {
|
|
v = apic_read(APIC_DFR);
|
|
printk(KERN_DEBUG "... APIC DFR: %08x\n", v);
|
|
}
|
|
v = apic_read(APIC_SPIV);
|
|
printk(KERN_DEBUG "... APIC SPIV: %08x\n", v);
|
|
|
|
printk(KERN_DEBUG "... APIC ISR field:\n");
|
|
print_APIC_field(APIC_ISR);
|
|
printk(KERN_DEBUG "... APIC TMR field:\n");
|
|
print_APIC_field(APIC_TMR);
|
|
printk(KERN_DEBUG "... APIC IRR field:\n");
|
|
print_APIC_field(APIC_IRR);
|
|
|
|
if (APIC_INTEGRATED(ver)) { /* !82489DX */
|
|
if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */
|
|
apic_write(APIC_ESR, 0);
|
|
|
|
v = apic_read(APIC_ESR);
|
|
printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
|
|
}
|
|
|
|
icr = apic_icr_read();
|
|
printk(KERN_DEBUG "... APIC ICR: %08x\n", (u32)icr);
|
|
printk(KERN_DEBUG "... APIC ICR2: %08x\n", (u32)(icr >> 32));
|
|
|
|
v = apic_read(APIC_LVTT);
|
|
printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
|
|
|
|
if (maxlvt > 3) { /* PC is LVT#4. */
|
|
v = apic_read(APIC_LVTPC);
|
|
printk(KERN_DEBUG "... APIC LVTPC: %08x\n", v);
|
|
}
|
|
v = apic_read(APIC_LVT0);
|
|
printk(KERN_DEBUG "... APIC LVT0: %08x\n", v);
|
|
v = apic_read(APIC_LVT1);
|
|
printk(KERN_DEBUG "... APIC LVT1: %08x\n", v);
|
|
|
|
if (maxlvt > 2) { /* ERR is LVT#3. */
|
|
v = apic_read(APIC_LVTERR);
|
|
printk(KERN_DEBUG "... APIC LVTERR: %08x\n", v);
|
|
}
|
|
|
|
v = apic_read(APIC_TMICT);
|
|
printk(KERN_DEBUG "... APIC TMICT: %08x\n", v);
|
|
v = apic_read(APIC_TMCCT);
|
|
printk(KERN_DEBUG "... APIC TMCCT: %08x\n", v);
|
|
v = apic_read(APIC_TDCR);
|
|
printk(KERN_DEBUG "... APIC TDCR: %08x\n", v);
|
|
|
|
if (boot_cpu_has(X86_FEATURE_EXTAPIC)) {
|
|
v = apic_read(APIC_EFEAT);
|
|
maxlvt = (v >> 16) & 0xff;
|
|
printk(KERN_DEBUG "... APIC EFEAT: %08x\n", v);
|
|
v = apic_read(APIC_ECTRL);
|
|
printk(KERN_DEBUG "... APIC ECTRL: %08x\n", v);
|
|
for (i = 0; i < maxlvt; i++) {
|
|
v = apic_read(APIC_EILVTn(i));
|
|
printk(KERN_DEBUG "... APIC EILVT%d: %08x\n", i, v);
|
|
}
|
|
}
|
|
printk("\n");
|
|
}
|
|
|
|
__apicdebuginit(void) print_local_APICs(int maxcpu)
|
|
{
|
|
int cpu;
|
|
|
|
if (!maxcpu)
|
|
return;
|
|
|
|
preempt_disable();
|
|
for_each_online_cpu(cpu) {
|
|
if (cpu >= maxcpu)
|
|
break;
|
|
smp_call_function_single(cpu, print_local_APIC, NULL, 1);
|
|
}
|
|
preempt_enable();
|
|
}
|
|
|
|
__apicdebuginit(void) print_PIC(void)
|
|
{
|
|
unsigned int v;
|
|
unsigned long flags;
|
|
|
|
if (!legacy_pic->nr_legacy_irqs)
|
|
return;
|
|
|
|
printk(KERN_DEBUG "\nprinting PIC contents\n");
|
|
|
|
raw_spin_lock_irqsave(&i8259A_lock, flags);
|
|
|
|
v = inb(0xa1) << 8 | inb(0x21);
|
|
printk(KERN_DEBUG "... PIC IMR: %04x\n", v);
|
|
|
|
v = inb(0xa0) << 8 | inb(0x20);
|
|
printk(KERN_DEBUG "... PIC IRR: %04x\n", v);
|
|
|
|
outb(0x0b,0xa0);
|
|
outb(0x0b,0x20);
|
|
v = inb(0xa0) << 8 | inb(0x20);
|
|
outb(0x0a,0xa0);
|
|
outb(0x0a,0x20);
|
|
|
|
raw_spin_unlock_irqrestore(&i8259A_lock, flags);
|
|
|
|
printk(KERN_DEBUG "... PIC ISR: %04x\n", v);
|
|
|
|
v = inb(0x4d1) << 8 | inb(0x4d0);
|
|
printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
|
|
}
|
|
|
|
static int __initdata show_lapic = 1;
|
|
static __init int setup_show_lapic(char *arg)
|
|
{
|
|
int num = -1;
|
|
|
|
if (strcmp(arg, "all") == 0) {
|
|
show_lapic = CONFIG_NR_CPUS;
|
|
} else {
|
|
get_option(&arg, &num);
|
|
if (num >= 0)
|
|
show_lapic = num;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
__setup("show_lapic=", setup_show_lapic);
|
|
|
|
__apicdebuginit(int) print_ICs(void)
|
|
{
|
|
if (apic_verbosity == APIC_QUIET)
|
|
return 0;
|
|
|
|
print_PIC();
|
|
|
|
/* don't print out if apic is not there */
|
|
if (!cpu_has_apic && !apic_from_smp_config())
|
|
return 0;
|
|
|
|
print_local_APICs(show_lapic);
|
|
print_IO_APIC();
|
|
|
|
return 0;
|
|
}
|
|
|
|
fs_initcall(print_ICs);
|
|
|
|
|
|
/* Where if anywhere is the i8259 connect in external int mode */
|
|
static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
|
|
|
|
void __init enable_IO_APIC(void)
|
|
{
|
|
int i8259_apic, i8259_pin;
|
|
int apic;
|
|
|
|
if (!legacy_pic->nr_legacy_irqs)
|
|
return;
|
|
|
|
for(apic = 0; apic < nr_ioapics; apic++) {
|
|
int pin;
|
|
/* See if any of the pins is in ExtINT mode */
|
|
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
|
|
struct IO_APIC_route_entry entry;
|
|
entry = ioapic_read_entry(apic, pin);
|
|
|
|
/* If the interrupt line is enabled and in ExtInt mode
|
|
* I have found the pin where the i8259 is connected.
|
|
*/
|
|
if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
|
|
ioapic_i8259.apic = apic;
|
|
ioapic_i8259.pin = pin;
|
|
goto found_i8259;
|
|
}
|
|
}
|
|
}
|
|
found_i8259:
|
|
/* Look to see what if the MP table has reported the ExtINT */
|
|
/* If we could not find the appropriate pin by looking at the ioapic
|
|
* the i8259 probably is not connected the ioapic but give the
|
|
* mptable a chance anyway.
|
|
*/
|
|
i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
|
|
i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
|
|
/* Trust the MP table if nothing is setup in the hardware */
|
|
if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
|
|
printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
|
|
ioapic_i8259.pin = i8259_pin;
|
|
ioapic_i8259.apic = i8259_apic;
|
|
}
|
|
/* Complain if the MP table and the hardware disagree */
|
|
if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
|
|
(i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
|
|
{
|
|
printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
|
|
}
|
|
|
|
/*
|
|
* Do not trust the IO-APIC being empty at bootup
|
|
*/
|
|
clear_IO_APIC();
|
|
}
|
|
|
|
/*
|
|
* Not an __init, needed by the reboot code
|
|
*/
|
|
void disable_IO_APIC(void)
|
|
{
|
|
/*
|
|
* Clear the IO-APIC before rebooting:
|
|
*/
|
|
clear_IO_APIC();
|
|
|
|
if (!legacy_pic->nr_legacy_irqs)
|
|
return;
|
|
|
|
/*
|
|
* If the i8259 is routed through an IOAPIC
|
|
* Put that IOAPIC in virtual wire mode
|
|
* so legacy interrupts can be delivered.
|
|
*
|
|
* With interrupt-remapping, for now we will use virtual wire A mode,
|
|
* as virtual wire B is little complex (need to configure both
|
|
* IOAPIC RTE aswell as interrupt-remapping table entry).
|
|
* As this gets called during crash dump, keep this simple for now.
|
|
*/
|
|
if (ioapic_i8259.pin != -1 && !intr_remapping_enabled) {
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
memset(&entry, 0, sizeof(entry));
|
|
entry.mask = 0; /* Enabled */
|
|
entry.trigger = 0; /* Edge */
|
|
entry.irr = 0;
|
|
entry.polarity = 0; /* High */
|
|
entry.delivery_status = 0;
|
|
entry.dest_mode = 0; /* Physical */
|
|
entry.delivery_mode = dest_ExtINT; /* ExtInt */
|
|
entry.vector = 0;
|
|
entry.dest = read_apic_id();
|
|
|
|
/*
|
|
* Add it to the IO-APIC irq-routing table:
|
|
*/
|
|
ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
|
|
}
|
|
|
|
/*
|
|
* Use virtual wire A mode when interrupt remapping is enabled.
|
|
*/
|
|
if (cpu_has_apic || apic_from_smp_config())
|
|
disconnect_bsp_APIC(!intr_remapping_enabled &&
|
|
ioapic_i8259.pin != -1);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* function to set the IO-APIC physical IDs based on the
|
|
* values stored in the MPC table.
|
|
*
|
|
* by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
|
|
*/
|
|
|
|
void __init setup_ioapic_ids_from_mpc(void)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
physid_mask_t phys_id_present_map;
|
|
int apic_id;
|
|
int i;
|
|
unsigned char old_id;
|
|
unsigned long flags;
|
|
|
|
if (acpi_ioapic)
|
|
return;
|
|
/*
|
|
* Don't check I/O APIC IDs for xAPIC systems. They have
|
|
* no meaning without the serial APIC bus.
|
|
*/
|
|
if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
|
|
|| APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
|
|
return;
|
|
/*
|
|
* This is broken; anything with a real cpu count has to
|
|
* circumvent this idiocy regardless.
|
|
*/
|
|
apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
|
|
|
|
/*
|
|
* Set the IOAPIC ID to the value stored in the MPC table.
|
|
*/
|
|
for (apic_id = 0; apic_id < nr_ioapics; apic_id++) {
|
|
|
|
/* Read the register 0 value */
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(apic_id, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
old_id = mp_ioapics[apic_id].apicid;
|
|
|
|
if (mp_ioapics[apic_id].apicid >= get_physical_broadcast()) {
|
|
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
|
|
apic_id, mp_ioapics[apic_id].apicid);
|
|
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
|
|
reg_00.bits.ID);
|
|
mp_ioapics[apic_id].apicid = reg_00.bits.ID;
|
|
}
|
|
|
|
/*
|
|
* Sanity check, is the ID really free? Every APIC in a
|
|
* system must have a unique ID or we get lots of nice
|
|
* 'stuck on smp_invalidate_needed IPI wait' messages.
|
|
*/
|
|
if (apic->check_apicid_used(&phys_id_present_map,
|
|
mp_ioapics[apic_id].apicid)) {
|
|
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
|
|
apic_id, mp_ioapics[apic_id].apicid);
|
|
for (i = 0; i < get_physical_broadcast(); i++)
|
|
if (!physid_isset(i, phys_id_present_map))
|
|
break;
|
|
if (i >= get_physical_broadcast())
|
|
panic("Max APIC ID exceeded!\n");
|
|
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
|
|
i);
|
|
physid_set(i, phys_id_present_map);
|
|
mp_ioapics[apic_id].apicid = i;
|
|
} else {
|
|
physid_mask_t tmp;
|
|
apic->apicid_to_cpu_present(mp_ioapics[apic_id].apicid, &tmp);
|
|
apic_printk(APIC_VERBOSE, "Setting %d in the "
|
|
"phys_id_present_map\n",
|
|
mp_ioapics[apic_id].apicid);
|
|
physids_or(phys_id_present_map, phys_id_present_map, tmp);
|
|
}
|
|
|
|
|
|
/*
|
|
* We need to adjust the IRQ routing table
|
|
* if the ID changed.
|
|
*/
|
|
if (old_id != mp_ioapics[apic_id].apicid)
|
|
for (i = 0; i < mp_irq_entries; i++)
|
|
if (mp_irqs[i].dstapic == old_id)
|
|
mp_irqs[i].dstapic
|
|
= mp_ioapics[apic_id].apicid;
|
|
|
|
/*
|
|
* Read the right value from the MPC table and
|
|
* write it into the ID register.
|
|
*/
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"...changing IO-APIC physical APIC ID to %d ...",
|
|
mp_ioapics[apic_id].apicid);
|
|
|
|
reg_00.bits.ID = mp_ioapics[apic_id].apicid;
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(apic_id, 0, reg_00.raw);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(apic_id, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
if (reg_00.bits.ID != mp_ioapics[apic_id].apicid)
|
|
printk("could not set ID!\n");
|
|
else
|
|
apic_printk(APIC_VERBOSE, " ok.\n");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int no_timer_check __initdata;
|
|
|
|
static int __init notimercheck(char *s)
|
|
{
|
|
no_timer_check = 1;
|
|
return 1;
|
|
}
|
|
__setup("no_timer_check", notimercheck);
|
|
|
|
/*
|
|
* There is a nasty bug in some older SMP boards, their mptable lies
|
|
* about the timer IRQ. We do the following to work around the situation:
|
|
*
|
|
* - timer IRQ defaults to IO-APIC IRQ
|
|
* - if this function detects that timer IRQs are defunct, then we fall
|
|
* back to ISA timer IRQs
|
|
*/
|
|
static int __init timer_irq_works(void)
|
|
{
|
|
unsigned long t1 = jiffies;
|
|
unsigned long flags;
|
|
|
|
if (no_timer_check)
|
|
return 1;
|
|
|
|
local_save_flags(flags);
|
|
local_irq_enable();
|
|
/* Let ten ticks pass... */
|
|
mdelay((10 * 1000) / HZ);
|
|
local_irq_restore(flags);
|
|
|
|
/*
|
|
* Expect a few ticks at least, to be sure some possible
|
|
* glue logic does not lock up after one or two first
|
|
* ticks in a non-ExtINT mode. Also the local APIC
|
|
* might have cached one ExtINT interrupt. Finally, at
|
|
* least one tick may be lost due to delays.
|
|
*/
|
|
|
|
/* jiffies wrap? */
|
|
if (time_after(jiffies, t1 + 4))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* In the SMP+IOAPIC case it might happen that there are an unspecified
|
|
* number of pending IRQ events unhandled. These cases are very rare,
|
|
* so we 'resend' these IRQs via IPIs, to the same CPU. It's much
|
|
* better to do it this way as thus we do not have to be aware of
|
|
* 'pending' interrupts in the IRQ path, except at this point.
|
|
*/
|
|
/*
|
|
* Edge triggered needs to resend any interrupt
|
|
* that was delayed but this is now handled in the device
|
|
* independent code.
|
|
*/
|
|
|
|
/*
|
|
* Starting up a edge-triggered IO-APIC interrupt is
|
|
* nasty - we need to make sure that we get the edge.
|
|
* If it is already asserted for some reason, we need
|
|
* return 1 to indicate that is was pending.
|
|
*
|
|
* This is not complete - we should be able to fake
|
|
* an edge even if it isn't on the 8259A...
|
|
*/
|
|
|
|
static unsigned int startup_ioapic_irq(struct irq_data *data)
|
|
{
|
|
int was_pending = 0, irq = data->irq;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
if (irq < legacy_pic->nr_legacy_irqs) {
|
|
legacy_pic->mask(irq);
|
|
if (legacy_pic->irq_pending(irq))
|
|
was_pending = 1;
|
|
}
|
|
__unmask_ioapic(data->chip_data);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return was_pending;
|
|
}
|
|
|
|
static int ioapic_retrigger_irq(struct irq_data *data)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&vector_lock, flags);
|
|
apic->send_IPI_mask(cpumask_of(cpumask_first(cfg->domain)), cfg->vector);
|
|
raw_spin_unlock_irqrestore(&vector_lock, flags);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Level and edge triggered IO-APIC interrupts need different handling,
|
|
* so we use two separate IRQ descriptors. Edge triggered IRQs can be
|
|
* handled with the level-triggered descriptor, but that one has slightly
|
|
* more overhead. Level-triggered interrupts cannot be handled with the
|
|
* edge-triggered handler, without risking IRQ storms and other ugly
|
|
* races.
|
|
*/
|
|
|
|
#ifdef CONFIG_SMP
|
|
void send_cleanup_vector(struct irq_cfg *cfg)
|
|
{
|
|
cpumask_var_t cleanup_mask;
|
|
|
|
if (unlikely(!alloc_cpumask_var(&cleanup_mask, GFP_ATOMIC))) {
|
|
unsigned int i;
|
|
for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
|
|
apic->send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
|
|
} else {
|
|
cpumask_and(cleanup_mask, cfg->old_domain, cpu_online_mask);
|
|
apic->send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
|
|
free_cpumask_var(cleanup_mask);
|
|
}
|
|
cfg->move_in_progress = 0;
|
|
}
|
|
|
|
static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, struct irq_cfg *cfg)
|
|
{
|
|
int apic, pin;
|
|
struct irq_pin_list *entry;
|
|
u8 vector = cfg->vector;
|
|
|
|
for_each_irq_pin(entry, cfg->irq_2_pin) {
|
|
unsigned int reg;
|
|
|
|
apic = entry->apic;
|
|
pin = entry->pin;
|
|
/*
|
|
* With interrupt-remapping, destination information comes
|
|
* from interrupt-remapping table entry.
|
|
*/
|
|
if (!irq_remapped(cfg))
|
|
io_apic_write(apic, 0x11 + pin*2, dest);
|
|
reg = io_apic_read(apic, 0x10 + pin*2);
|
|
reg &= ~IO_APIC_REDIR_VECTOR_MASK;
|
|
reg |= vector;
|
|
io_apic_modify(apic, 0x10 + pin*2, reg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Either sets data->affinity to a valid value, and returns
|
|
* ->cpu_mask_to_apicid of that in dest_id, or returns -1 and
|
|
* leaves data->affinity untouched.
|
|
*/
|
|
int __ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
|
|
unsigned int *dest_id)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
|
|
if (!cpumask_intersects(mask, cpu_online_mask))
|
|
return -1;
|
|
|
|
if (assign_irq_vector(data->irq, data->chip_data, mask))
|
|
return -1;
|
|
|
|
cpumask_copy(data->affinity, mask);
|
|
|
|
*dest_id = apic->cpu_mask_to_apicid_and(mask, cfg->domain);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
|
|
bool force)
|
|
{
|
|
unsigned int dest, irq = data->irq;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
ret = __ioapic_set_affinity(data, mask, &dest);
|
|
if (!ret) {
|
|
/* Only the high 8 bits are valid. */
|
|
dest = SET_APIC_LOGICAL_ID(dest);
|
|
__target_IO_APIC_irq(irq, dest, data->chip_data);
|
|
}
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_INTR_REMAP
|
|
|
|
/*
|
|
* Migrate the IO-APIC irq in the presence of intr-remapping.
|
|
*
|
|
* For both level and edge triggered, irq migration is a simple atomic
|
|
* update(of vector and cpu destination) of IRTE and flush the hardware cache.
|
|
*
|
|
* For level triggered, we eliminate the io-apic RTE modification (with the
|
|
* updated vector information), by using a virtual vector (io-apic pin number).
|
|
* Real vector that is used for interrupting cpu will be coming from
|
|
* the interrupt-remapping table entry.
|
|
*/
|
|
static int
|
|
ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
|
|
bool force)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
unsigned int dest, irq = data->irq;
|
|
struct irte irte;
|
|
|
|
if (!cpumask_intersects(mask, cpu_online_mask))
|
|
return -EINVAL;
|
|
|
|
if (get_irte(irq, &irte))
|
|
return -EBUSY;
|
|
|
|
if (assign_irq_vector(irq, cfg, mask))
|
|
return -EBUSY;
|
|
|
|
dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
|
|
|
|
irte.vector = cfg->vector;
|
|
irte.dest_id = IRTE_DEST(dest);
|
|
|
|
/*
|
|
* Modified the IRTE and flushes the Interrupt entry cache.
|
|
*/
|
|
modify_irte(irq, &irte);
|
|
|
|
if (cfg->move_in_progress)
|
|
send_cleanup_vector(cfg);
|
|
|
|
cpumask_copy(data->affinity, mask);
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
static inline int
|
|
ir_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
|
|
bool force)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
asmlinkage void smp_irq_move_cleanup_interrupt(void)
|
|
{
|
|
unsigned vector, me;
|
|
|
|
ack_APIC_irq();
|
|
exit_idle();
|
|
irq_enter();
|
|
|
|
me = smp_processor_id();
|
|
for (vector = FIRST_EXTERNAL_VECTOR; vector < NR_VECTORS; vector++) {
|
|
unsigned int irq;
|
|
unsigned int irr;
|
|
struct irq_desc *desc;
|
|
struct irq_cfg *cfg;
|
|
irq = __get_cpu_var(vector_irq)[vector];
|
|
|
|
if (irq == -1)
|
|
continue;
|
|
|
|
desc = irq_to_desc(irq);
|
|
if (!desc)
|
|
continue;
|
|
|
|
cfg = irq_cfg(irq);
|
|
raw_spin_lock(&desc->lock);
|
|
|
|
/*
|
|
* Check if the irq migration is in progress. If so, we
|
|
* haven't received the cleanup request yet for this irq.
|
|
*/
|
|
if (cfg->move_in_progress)
|
|
goto unlock;
|
|
|
|
if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
|
|
goto unlock;
|
|
|
|
irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
|
|
/*
|
|
* Check if the vector that needs to be cleanedup is
|
|
* registered at the cpu's IRR. If so, then this is not
|
|
* the best time to clean it up. Lets clean it up in the
|
|
* next attempt by sending another IRQ_MOVE_CLEANUP_VECTOR
|
|
* to myself.
|
|
*/
|
|
if (irr & (1 << (vector % 32))) {
|
|
apic->send_IPI_self(IRQ_MOVE_CLEANUP_VECTOR);
|
|
goto unlock;
|
|
}
|
|
__get_cpu_var(vector_irq)[vector] = -1;
|
|
unlock:
|
|
raw_spin_unlock(&desc->lock);
|
|
}
|
|
|
|
irq_exit();
|
|
}
|
|
|
|
static void __irq_complete_move(struct irq_cfg *cfg, unsigned vector)
|
|
{
|
|
unsigned me;
|
|
|
|
if (likely(!cfg->move_in_progress))
|
|
return;
|
|
|
|
me = smp_processor_id();
|
|
|
|
if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
|
|
send_cleanup_vector(cfg);
|
|
}
|
|
|
|
static void irq_complete_move(struct irq_cfg *cfg)
|
|
{
|
|
__irq_complete_move(cfg, ~get_irq_regs()->orig_ax);
|
|
}
|
|
|
|
void irq_force_complete_move(int irq)
|
|
{
|
|
struct irq_cfg *cfg = get_irq_chip_data(irq);
|
|
|
|
if (!cfg)
|
|
return;
|
|
|
|
__irq_complete_move(cfg, cfg->vector);
|
|
}
|
|
#else
|
|
static inline void irq_complete_move(struct irq_cfg *cfg) { }
|
|
#endif
|
|
|
|
static void ack_apic_edge(struct irq_data *data)
|
|
{
|
|
irq_complete_move(data->chip_data);
|
|
move_native_irq(data->irq);
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
atomic_t irq_mis_count;
|
|
|
|
/*
|
|
* IO-APIC versions below 0x20 don't support EOI register.
|
|
* For the record, here is the information about various versions:
|
|
* 0Xh 82489DX
|
|
* 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
|
|
* 2Xh I/O(x)APIC which is PCI 2.2 Compliant
|
|
* 30h-FFh Reserved
|
|
*
|
|
* Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
|
|
* version as 0x2. This is an error with documentation and these ICH chips
|
|
* use io-apic's of version 0x20.
|
|
*
|
|
* For IO-APIC's with EOI register, we use that to do an explicit EOI.
|
|
* Otherwise, we simulate the EOI message manually by changing the trigger
|
|
* mode to edge and then back to level, with RTE being masked during this.
|
|
*/
|
|
static void eoi_ioapic_irq(unsigned int irq, struct irq_cfg *cfg)
|
|
{
|
|
struct irq_pin_list *entry;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
for_each_irq_pin(entry, cfg->irq_2_pin) {
|
|
if (mp_ioapics[entry->apic].apicver >= 0x20) {
|
|
/*
|
|
* Intr-remapping uses pin number as the virtual vector
|
|
* in the RTE. Actual vector is programmed in
|
|
* intr-remapping table entry. Hence for the io-apic
|
|
* EOI we use the pin number.
|
|
*/
|
|
if (irq_remapped(cfg))
|
|
io_apic_eoi(entry->apic, entry->pin);
|
|
else
|
|
io_apic_eoi(entry->apic, cfg->vector);
|
|
} else {
|
|
__mask_and_edge_IO_APIC_irq(entry);
|
|
__unmask_and_level_IO_APIC_irq(entry);
|
|
}
|
|
}
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
static void ack_apic_level(struct irq_data *data)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
int i, do_unmask_irq = 0, irq = data->irq;
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long v;
|
|
|
|
irq_complete_move(cfg);
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
/* If we are moving the irq we need to mask it */
|
|
if (unlikely(desc->status & IRQ_MOVE_PENDING)) {
|
|
do_unmask_irq = 1;
|
|
mask_ioapic(cfg);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* It appears there is an erratum which affects at least version 0x11
|
|
* of I/O APIC (that's the 82093AA and cores integrated into various
|
|
* chipsets). Under certain conditions a level-triggered interrupt is
|
|
* erroneously delivered as edge-triggered one but the respective IRR
|
|
* bit gets set nevertheless. As a result the I/O unit expects an EOI
|
|
* message but it will never arrive and further interrupts are blocked
|
|
* from the source. The exact reason is so far unknown, but the
|
|
* phenomenon was observed when two consecutive interrupt requests
|
|
* from a given source get delivered to the same CPU and the source is
|
|
* temporarily disabled in between.
|
|
*
|
|
* A workaround is to simulate an EOI message manually. We achieve it
|
|
* by setting the trigger mode to edge and then to level when the edge
|
|
* trigger mode gets detected in the TMR of a local APIC for a
|
|
* level-triggered interrupt. We mask the source for the time of the
|
|
* operation to prevent an edge-triggered interrupt escaping meanwhile.
|
|
* The idea is from Manfred Spraul. --macro
|
|
*
|
|
* Also in the case when cpu goes offline, fixup_irqs() will forward
|
|
* any unhandled interrupt on the offlined cpu to the new cpu
|
|
* destination that is handling the corresponding interrupt. This
|
|
* interrupt forwarding is done via IPI's. Hence, in this case also
|
|
* level-triggered io-apic interrupt will be seen as an edge
|
|
* interrupt in the IRR. And we can't rely on the cpu's EOI
|
|
* to be broadcasted to the IO-APIC's which will clear the remoteIRR
|
|
* corresponding to the level-triggered interrupt. Hence on IO-APIC's
|
|
* supporting EOI register, we do an explicit EOI to clear the
|
|
* remote IRR and on IO-APIC's which don't have an EOI register,
|
|
* we use the above logic (mask+edge followed by unmask+level) from
|
|
* Manfred Spraul to clear the remote IRR.
|
|
*/
|
|
i = cfg->vector;
|
|
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
|
|
|
|
/*
|
|
* We must acknowledge the irq before we move it or the acknowledge will
|
|
* not propagate properly.
|
|
*/
|
|
ack_APIC_irq();
|
|
|
|
/*
|
|
* Tail end of clearing remote IRR bit (either by delivering the EOI
|
|
* message via io-apic EOI register write or simulating it using
|
|
* mask+edge followed by unnask+level logic) manually when the
|
|
* level triggered interrupt is seen as the edge triggered interrupt
|
|
* at the cpu.
|
|
*/
|
|
if (!(v & (1 << (i & 0x1f)))) {
|
|
atomic_inc(&irq_mis_count);
|
|
|
|
eoi_ioapic_irq(irq, cfg);
|
|
}
|
|
|
|
/* Now we can move and renable the irq */
|
|
if (unlikely(do_unmask_irq)) {
|
|
/* Only migrate the irq if the ack has been received.
|
|
*
|
|
* On rare occasions the broadcast level triggered ack gets
|
|
* delayed going to ioapics, and if we reprogram the
|
|
* vector while Remote IRR is still set the irq will never
|
|
* fire again.
|
|
*
|
|
* To prevent this scenario we read the Remote IRR bit
|
|
* of the ioapic. This has two effects.
|
|
* - On any sane system the read of the ioapic will
|
|
* flush writes (and acks) going to the ioapic from
|
|
* this cpu.
|
|
* - We get to see if the ACK has actually been delivered.
|
|
*
|
|
* Based on failed experiments of reprogramming the
|
|
* ioapic entry from outside of irq context starting
|
|
* with masking the ioapic entry and then polling until
|
|
* Remote IRR was clear before reprogramming the
|
|
* ioapic I don't trust the Remote IRR bit to be
|
|
* completey accurate.
|
|
*
|
|
* However there appears to be no other way to plug
|
|
* this race, so if the Remote IRR bit is not
|
|
* accurate and is causing problems then it is a hardware bug
|
|
* and you can go talk to the chipset vendor about it.
|
|
*/
|
|
if (!io_apic_level_ack_pending(cfg))
|
|
move_masked_irq(irq);
|
|
unmask_ioapic(cfg);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_INTR_REMAP
|
|
static void ir_ack_apic_edge(struct irq_data *data)
|
|
{
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
static void ir_ack_apic_level(struct irq_data *data)
|
|
{
|
|
ack_APIC_irq();
|
|
eoi_ioapic_irq(data->irq, data->chip_data);
|
|
}
|
|
#endif /* CONFIG_INTR_REMAP */
|
|
|
|
static struct irq_chip ioapic_chip __read_mostly = {
|
|
.name = "IO-APIC",
|
|
.irq_startup = startup_ioapic_irq,
|
|
.irq_mask = mask_ioapic_irq,
|
|
.irq_unmask = unmask_ioapic_irq,
|
|
.irq_ack = ack_apic_edge,
|
|
.irq_eoi = ack_apic_level,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = ioapic_set_affinity,
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
static struct irq_chip ir_ioapic_chip __read_mostly = {
|
|
.name = "IR-IO-APIC",
|
|
.irq_startup = startup_ioapic_irq,
|
|
.irq_mask = mask_ioapic_irq,
|
|
.irq_unmask = unmask_ioapic_irq,
|
|
#ifdef CONFIG_INTR_REMAP
|
|
.irq_ack = ir_ack_apic_edge,
|
|
.irq_eoi = ir_ack_apic_level,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = ir_ioapic_set_affinity,
|
|
#endif
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
static inline void init_IO_APIC_traps(void)
|
|
{
|
|
struct irq_cfg *cfg;
|
|
unsigned int irq;
|
|
|
|
/*
|
|
* NOTE! The local APIC isn't very good at handling
|
|
* multiple interrupts at the same interrupt level.
|
|
* As the interrupt level is determined by taking the
|
|
* vector number and shifting that right by 4, we
|
|
* want to spread these out a bit so that they don't
|
|
* all fall in the same interrupt level.
|
|
*
|
|
* Also, we've got to be careful not to trash gate
|
|
* 0x80, because int 0x80 is hm, kind of importantish. ;)
|
|
*/
|
|
for_each_active_irq(irq) {
|
|
cfg = get_irq_chip_data(irq);
|
|
if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
|
|
/*
|
|
* Hmm.. We don't have an entry for this,
|
|
* so default to an old-fashioned 8259
|
|
* interrupt if we can..
|
|
*/
|
|
if (irq < legacy_pic->nr_legacy_irqs)
|
|
legacy_pic->make_irq(irq);
|
|
else
|
|
/* Strange. Oh, well.. */
|
|
set_irq_chip(irq, &no_irq_chip);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The local APIC irq-chip implementation:
|
|
*/
|
|
|
|
static void mask_lapic_irq(struct irq_data *data)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
|
|
}
|
|
|
|
static void unmask_lapic_irq(struct irq_data *data)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
|
|
}
|
|
|
|
static void ack_lapic_irq(struct irq_data *data)
|
|
{
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
static struct irq_chip lapic_chip __read_mostly = {
|
|
.name = "local-APIC",
|
|
.irq_mask = mask_lapic_irq,
|
|
.irq_unmask = unmask_lapic_irq,
|
|
.irq_ack = ack_lapic_irq,
|
|
};
|
|
|
|
static void lapic_register_intr(int irq)
|
|
{
|
|
irq_clear_status_flags(irq, IRQ_LEVEL);
|
|
set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
|
|
"edge");
|
|
}
|
|
|
|
static void __init setup_nmi(void)
|
|
{
|
|
/*
|
|
* Dirty trick to enable the NMI watchdog ...
|
|
* We put the 8259A master into AEOI mode and
|
|
* unmask on all local APICs LVT0 as NMI.
|
|
*
|
|
* The idea to use the 8259A in AEOI mode ('8259A Virtual Wire')
|
|
* is from Maciej W. Rozycki - so we do not have to EOI from
|
|
* the NMI handler or the timer interrupt.
|
|
*/
|
|
apic_printk(APIC_VERBOSE, KERN_INFO "activating NMI Watchdog ...");
|
|
|
|
enable_NMI_through_LVT0();
|
|
|
|
apic_printk(APIC_VERBOSE, " done.\n");
|
|
}
|
|
|
|
/*
|
|
* This looks a bit hackish but it's about the only one way of sending
|
|
* a few INTA cycles to 8259As and any associated glue logic. ICR does
|
|
* not support the ExtINT mode, unfortunately. We need to send these
|
|
* cycles as some i82489DX-based boards have glue logic that keeps the
|
|
* 8259A interrupt line asserted until INTA. --macro
|
|
*/
|
|
static inline void __init unlock_ExtINT_logic(void)
|
|
{
|
|
int apic, pin, i;
|
|
struct IO_APIC_route_entry entry0, entry1;
|
|
unsigned char save_control, save_freq_select;
|
|
|
|
pin = find_isa_irq_pin(8, mp_INT);
|
|
if (pin == -1) {
|
|
WARN_ON_ONCE(1);
|
|
return;
|
|
}
|
|
apic = find_isa_irq_apic(8, mp_INT);
|
|
if (apic == -1) {
|
|
WARN_ON_ONCE(1);
|
|
return;
|
|
}
|
|
|
|
entry0 = ioapic_read_entry(apic, pin);
|
|
clear_IO_APIC_pin(apic, pin);
|
|
|
|
memset(&entry1, 0, sizeof(entry1));
|
|
|
|
entry1.dest_mode = 0; /* physical delivery */
|
|
entry1.mask = 0; /* unmask IRQ now */
|
|
entry1.dest = hard_smp_processor_id();
|
|
entry1.delivery_mode = dest_ExtINT;
|
|
entry1.polarity = entry0.polarity;
|
|
entry1.trigger = 0;
|
|
entry1.vector = 0;
|
|
|
|
ioapic_write_entry(apic, pin, entry1);
|
|
|
|
save_control = CMOS_READ(RTC_CONTROL);
|
|
save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
|
|
CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
|
|
RTC_FREQ_SELECT);
|
|
CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
|
|
|
|
i = 100;
|
|
while (i-- > 0) {
|
|
mdelay(10);
|
|
if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
|
|
i -= 10;
|
|
}
|
|
|
|
CMOS_WRITE(save_control, RTC_CONTROL);
|
|
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
|
|
clear_IO_APIC_pin(apic, pin);
|
|
|
|
ioapic_write_entry(apic, pin, entry0);
|
|
}
|
|
|
|
static int disable_timer_pin_1 __initdata;
|
|
/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
|
|
static int __init disable_timer_pin_setup(char *arg)
|
|
{
|
|
disable_timer_pin_1 = 1;
|
|
return 0;
|
|
}
|
|
early_param("disable_timer_pin_1", disable_timer_pin_setup);
|
|
|
|
int timer_through_8259 __initdata;
|
|
|
|
/*
|
|
* This code may look a bit paranoid, but it's supposed to cooperate with
|
|
* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
|
|
* is so screwy. Thanks to Brian Perkins for testing/hacking this beast
|
|
* fanatically on his truly buggy board.
|
|
*
|
|
* FIXME: really need to revamp this for all platforms.
|
|
*/
|
|
static inline void __init check_timer(void)
|
|
{
|
|
struct irq_cfg *cfg = get_irq_chip_data(0);
|
|
int node = cpu_to_node(0);
|
|
int apic1, pin1, apic2, pin2;
|
|
unsigned long flags;
|
|
int no_pin1 = 0;
|
|
|
|
local_irq_save(flags);
|
|
|
|
/*
|
|
* get/set the timer IRQ vector:
|
|
*/
|
|
legacy_pic->mask(0);
|
|
assign_irq_vector(0, cfg, apic->target_cpus());
|
|
|
|
/*
|
|
* As IRQ0 is to be enabled in the 8259A, the virtual
|
|
* wire has to be disabled in the local APIC. Also
|
|
* timer interrupts need to be acknowledged manually in
|
|
* the 8259A for the i82489DX when using the NMI
|
|
* watchdog as that APIC treats NMIs as level-triggered.
|
|
* The AEOI mode will finish them in the 8259A
|
|
* automatically.
|
|
*/
|
|
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
|
|
legacy_pic->init(1);
|
|
#ifdef CONFIG_X86_32
|
|
{
|
|
unsigned int ver;
|
|
|
|
ver = apic_read(APIC_LVR);
|
|
ver = GET_APIC_VERSION(ver);
|
|
timer_ack = (nmi_watchdog == NMI_IO_APIC && !APIC_INTEGRATED(ver));
|
|
}
|
|
#endif
|
|
|
|
pin1 = find_isa_irq_pin(0, mp_INT);
|
|
apic1 = find_isa_irq_apic(0, mp_INT);
|
|
pin2 = ioapic_i8259.pin;
|
|
apic2 = ioapic_i8259.apic;
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
|
|
"apic1=%d pin1=%d apic2=%d pin2=%d\n",
|
|
cfg->vector, apic1, pin1, apic2, pin2);
|
|
|
|
/*
|
|
* Some BIOS writers are clueless and report the ExtINTA
|
|
* I/O APIC input from the cascaded 8259A as the timer
|
|
* interrupt input. So just in case, if only one pin
|
|
* was found above, try it both directly and through the
|
|
* 8259A.
|
|
*/
|
|
if (pin1 == -1) {
|
|
if (intr_remapping_enabled)
|
|
panic("BIOS bug: timer not connected to IO-APIC");
|
|
pin1 = pin2;
|
|
apic1 = apic2;
|
|
no_pin1 = 1;
|
|
} else if (pin2 == -1) {
|
|
pin2 = pin1;
|
|
apic2 = apic1;
|
|
}
|
|
|
|
if (pin1 != -1) {
|
|
/*
|
|
* Ok, does IRQ0 through the IOAPIC work?
|
|
*/
|
|
if (no_pin1) {
|
|
add_pin_to_irq_node(cfg, node, apic1, pin1);
|
|
setup_timer_IRQ0_pin(apic1, pin1, cfg->vector);
|
|
} else {
|
|
/* for edge trigger, setup_ioapic_irq already
|
|
* leave it unmasked.
|
|
* so only need to unmask if it is level-trigger
|
|
* do we really have level trigger timer?
|
|
*/
|
|
int idx;
|
|
idx = find_irq_entry(apic1, pin1, mp_INT);
|
|
if (idx != -1 && irq_trigger(idx))
|
|
unmask_ioapic(cfg);
|
|
}
|
|
if (timer_irq_works()) {
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
setup_nmi();
|
|
legacy_pic->unmask(0);
|
|
}
|
|
if (disable_timer_pin_1 > 0)
|
|
clear_IO_APIC_pin(0, pin1);
|
|
goto out;
|
|
}
|
|
if (intr_remapping_enabled)
|
|
panic("timer doesn't work through Interrupt-remapped IO-APIC");
|
|
local_irq_disable();
|
|
clear_IO_APIC_pin(apic1, pin1);
|
|
if (!no_pin1)
|
|
apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
|
|
"8254 timer not connected to IO-APIC\n");
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
|
|
"(IRQ0) through the 8259A ...\n");
|
|
apic_printk(APIC_QUIET, KERN_INFO
|
|
"..... (found apic %d pin %d) ...\n", apic2, pin2);
|
|
/*
|
|
* legacy devices should be connected to IO APIC #0
|
|
*/
|
|
replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
|
|
setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
|
|
legacy_pic->unmask(0);
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
|
|
timer_through_8259 = 1;
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
legacy_pic->mask(0);
|
|
setup_nmi();
|
|
legacy_pic->unmask(0);
|
|
}
|
|
goto out;
|
|
}
|
|
/*
|
|
* Cleanup, just in case ...
|
|
*/
|
|
local_irq_disable();
|
|
legacy_pic->mask(0);
|
|
clear_IO_APIC_pin(apic2, pin2);
|
|
apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
|
|
}
|
|
|
|
if (nmi_watchdog == NMI_IO_APIC) {
|
|
apic_printk(APIC_QUIET, KERN_WARNING "timer doesn't work "
|
|
"through the IO-APIC - disabling NMI Watchdog!\n");
|
|
nmi_watchdog = NMI_NONE;
|
|
}
|
|
#ifdef CONFIG_X86_32
|
|
timer_ack = 0;
|
|
#endif
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO
|
|
"...trying to set up timer as Virtual Wire IRQ...\n");
|
|
|
|
lapic_register_intr(0);
|
|
apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
|
|
legacy_pic->unmask(0);
|
|
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
|
|
goto out;
|
|
}
|
|
local_irq_disable();
|
|
legacy_pic->mask(0);
|
|
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO
|
|
"...trying to set up timer as ExtINT IRQ...\n");
|
|
|
|
legacy_pic->init(0);
|
|
legacy_pic->make_irq(0);
|
|
apic_write(APIC_LVT0, APIC_DM_EXTINT);
|
|
|
|
unlock_ExtINT_logic();
|
|
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
|
|
goto out;
|
|
}
|
|
local_irq_disable();
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
|
|
panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
|
|
"report. Then try booting with the 'noapic' option.\n");
|
|
out:
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* Traditionally ISA IRQ2 is the cascade IRQ, and is not available
|
|
* to devices. However there may be an I/O APIC pin available for
|
|
* this interrupt regardless. The pin may be left unconnected, but
|
|
* typically it will be reused as an ExtINT cascade interrupt for
|
|
* the master 8259A. In the MPS case such a pin will normally be
|
|
* reported as an ExtINT interrupt in the MP table. With ACPI
|
|
* there is no provision for ExtINT interrupts, and in the absence
|
|
* of an override it would be treated as an ordinary ISA I/O APIC
|
|
* interrupt, that is edge-triggered and unmasked by default. We
|
|
* used to do this, but it caused problems on some systems because
|
|
* of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
|
|
* the same ExtINT cascade interrupt to drive the local APIC of the
|
|
* bootstrap processor. Therefore we refrain from routing IRQ2 to
|
|
* the I/O APIC in all cases now. No actual device should request
|
|
* it anyway. --macro
|
|
*/
|
|
#define PIC_IRQS (1UL << PIC_CASCADE_IR)
|
|
|
|
void __init setup_IO_APIC(void)
|
|
{
|
|
|
|
/*
|
|
* calling enable_IO_APIC() is moved to setup_local_APIC for BP
|
|
*/
|
|
io_apic_irqs = legacy_pic->nr_legacy_irqs ? ~PIC_IRQS : ~0UL;
|
|
|
|
apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
|
|
/*
|
|
* Set up IO-APIC IRQ routing.
|
|
*/
|
|
x86_init.mpparse.setup_ioapic_ids();
|
|
|
|
sync_Arb_IDs();
|
|
setup_IO_APIC_irqs();
|
|
init_IO_APIC_traps();
|
|
if (legacy_pic->nr_legacy_irqs)
|
|
check_timer();
|
|
}
|
|
|
|
/*
|
|
* Called after all the initialization is done. If we didnt find any
|
|
* APIC bugs then we can allow the modify fast path
|
|
*/
|
|
|
|
static int __init io_apic_bug_finalize(void)
|
|
{
|
|
if (sis_apic_bug == -1)
|
|
sis_apic_bug = 0;
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(io_apic_bug_finalize);
|
|
|
|
struct sysfs_ioapic_data {
|
|
struct sys_device dev;
|
|
struct IO_APIC_route_entry entry[0];
|
|
};
|
|
static struct sysfs_ioapic_data * mp_ioapic_data[MAX_IO_APICS];
|
|
|
|
static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
|
|
{
|
|
struct IO_APIC_route_entry *entry;
|
|
struct sysfs_ioapic_data *data;
|
|
int i;
|
|
|
|
data = container_of(dev, struct sysfs_ioapic_data, dev);
|
|
entry = data->entry;
|
|
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
|
|
*entry = ioapic_read_entry(dev->id, i);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ioapic_resume(struct sys_device *dev)
|
|
{
|
|
struct IO_APIC_route_entry *entry;
|
|
struct sysfs_ioapic_data *data;
|
|
unsigned long flags;
|
|
union IO_APIC_reg_00 reg_00;
|
|
int i;
|
|
|
|
data = container_of(dev, struct sysfs_ioapic_data, dev);
|
|
entry = data->entry;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(dev->id, 0);
|
|
if (reg_00.bits.ID != mp_ioapics[dev->id].apicid) {
|
|
reg_00.bits.ID = mp_ioapics[dev->id].apicid;
|
|
io_apic_write(dev->id, 0, reg_00.raw);
|
|
}
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
|
|
ioapic_write_entry(dev->id, i, entry[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct sysdev_class ioapic_sysdev_class = {
|
|
.name = "ioapic",
|
|
.suspend = ioapic_suspend,
|
|
.resume = ioapic_resume,
|
|
};
|
|
|
|
static int __init ioapic_init_sysfs(void)
|
|
{
|
|
struct sys_device * dev;
|
|
int i, size, error;
|
|
|
|
error = sysdev_class_register(&ioapic_sysdev_class);
|
|
if (error)
|
|
return error;
|
|
|
|
for (i = 0; i < nr_ioapics; i++ ) {
|
|
size = sizeof(struct sys_device) + nr_ioapic_registers[i]
|
|
* sizeof(struct IO_APIC_route_entry);
|
|
mp_ioapic_data[i] = kzalloc(size, GFP_KERNEL);
|
|
if (!mp_ioapic_data[i]) {
|
|
printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
|
|
continue;
|
|
}
|
|
dev = &mp_ioapic_data[i]->dev;
|
|
dev->id = i;
|
|
dev->cls = &ioapic_sysdev_class;
|
|
error = sysdev_register(dev);
|
|
if (error) {
|
|
kfree(mp_ioapic_data[i]);
|
|
mp_ioapic_data[i] = NULL;
|
|
printk(KERN_ERR "Can't suspend/resume IOAPIC %d\n", i);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(ioapic_init_sysfs);
|
|
|
|
/*
|
|
* Dynamic irq allocate and deallocation
|
|
*/
|
|
unsigned int create_irq_nr(unsigned int from, int node)
|
|
{
|
|
struct irq_cfg *cfg;
|
|
unsigned long flags;
|
|
unsigned int ret = 0;
|
|
int irq;
|
|
|
|
if (from < nr_irqs_gsi)
|
|
from = nr_irqs_gsi;
|
|
|
|
irq = alloc_irq_from(from, node);
|
|
if (irq < 0)
|
|
return 0;
|
|
cfg = alloc_irq_cfg(irq, node);
|
|
if (!cfg) {
|
|
free_irq_at(irq, NULL);
|
|
return 0;
|
|
}
|
|
|
|
raw_spin_lock_irqsave(&vector_lock, flags);
|
|
if (!__assign_irq_vector(irq, cfg, apic->target_cpus()))
|
|
ret = irq;
|
|
raw_spin_unlock_irqrestore(&vector_lock, flags);
|
|
|
|
if (ret) {
|
|
set_irq_chip_data(irq, cfg);
|
|
irq_clear_status_flags(irq, IRQ_NOREQUEST);
|
|
} else {
|
|
free_irq_at(irq, cfg);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int create_irq(void)
|
|
{
|
|
int node = cpu_to_node(0);
|
|
unsigned int irq_want;
|
|
int irq;
|
|
|
|
irq_want = nr_irqs_gsi;
|
|
irq = create_irq_nr(irq_want, node);
|
|
|
|
if (irq == 0)
|
|
irq = -1;
|
|
|
|
return irq;
|
|
}
|
|
|
|
void destroy_irq(unsigned int irq)
|
|
{
|
|
struct irq_cfg *cfg = get_irq_chip_data(irq);
|
|
unsigned long flags;
|
|
|
|
irq_set_status_flags(irq, IRQ_NOREQUEST|IRQ_NOPROBE);
|
|
|
|
if (irq_remapped(cfg))
|
|
free_irte(irq);
|
|
raw_spin_lock_irqsave(&vector_lock, flags);
|
|
__clear_irq_vector(irq, cfg);
|
|
raw_spin_unlock_irqrestore(&vector_lock, flags);
|
|
free_irq_at(irq, cfg);
|
|
}
|
|
|
|
/*
|
|
* MSI message composition
|
|
*/
|
|
#ifdef CONFIG_PCI_MSI
|
|
static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq,
|
|
struct msi_msg *msg, u8 hpet_id)
|
|
{
|
|
struct irq_cfg *cfg;
|
|
int err;
|
|
unsigned dest;
|
|
|
|
if (disable_apic)
|
|
return -ENXIO;
|
|
|
|
cfg = irq_cfg(irq);
|
|
err = assign_irq_vector(irq, cfg, apic->target_cpus());
|
|
if (err)
|
|
return err;
|
|
|
|
dest = apic->cpu_mask_to_apicid_and(cfg->domain, apic->target_cpus());
|
|
|
|
if (irq_remapped(get_irq_chip_data(irq))) {
|
|
struct irte irte;
|
|
int ir_index;
|
|
u16 sub_handle;
|
|
|
|
ir_index = map_irq_to_irte_handle(irq, &sub_handle);
|
|
BUG_ON(ir_index == -1);
|
|
|
|
prepare_irte(&irte, cfg->vector, dest);
|
|
|
|
/* Set source-id of interrupt request */
|
|
if (pdev)
|
|
set_msi_sid(&irte, pdev);
|
|
else
|
|
set_hpet_sid(&irte, hpet_id);
|
|
|
|
modify_irte(irq, &irte);
|
|
|
|
msg->address_hi = MSI_ADDR_BASE_HI;
|
|
msg->data = sub_handle;
|
|
msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
|
|
MSI_ADDR_IR_SHV |
|
|
MSI_ADDR_IR_INDEX1(ir_index) |
|
|
MSI_ADDR_IR_INDEX2(ir_index);
|
|
} else {
|
|
if (x2apic_enabled())
|
|
msg->address_hi = MSI_ADDR_BASE_HI |
|
|
MSI_ADDR_EXT_DEST_ID(dest);
|
|
else
|
|
msg->address_hi = MSI_ADDR_BASE_HI;
|
|
|
|
msg->address_lo =
|
|
MSI_ADDR_BASE_LO |
|
|
((apic->irq_dest_mode == 0) ?
|
|
MSI_ADDR_DEST_MODE_PHYSICAL:
|
|
MSI_ADDR_DEST_MODE_LOGICAL) |
|
|
((apic->irq_delivery_mode != dest_LowestPrio) ?
|
|
MSI_ADDR_REDIRECTION_CPU:
|
|
MSI_ADDR_REDIRECTION_LOWPRI) |
|
|
MSI_ADDR_DEST_ID(dest);
|
|
|
|
msg->data =
|
|
MSI_DATA_TRIGGER_EDGE |
|
|
MSI_DATA_LEVEL_ASSERT |
|
|
((apic->irq_delivery_mode != dest_LowestPrio) ?
|
|
MSI_DATA_DELIVERY_FIXED:
|
|
MSI_DATA_DELIVERY_LOWPRI) |
|
|
MSI_DATA_VECTOR(cfg->vector);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int
|
|
msi_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
struct msi_msg msg;
|
|
unsigned int dest;
|
|
|
|
if (__ioapic_set_affinity(data, mask, &dest))
|
|
return -1;
|
|
|
|
__get_cached_msi_msg(data->msi_desc, &msg);
|
|
|
|
msg.data &= ~MSI_DATA_VECTOR_MASK;
|
|
msg.data |= MSI_DATA_VECTOR(cfg->vector);
|
|
msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
|
|
msg.address_lo |= MSI_ADDR_DEST_ID(dest);
|
|
|
|
__write_msi_msg(data->msi_desc, &msg);
|
|
|
|
return 0;
|
|
}
|
|
#ifdef CONFIG_INTR_REMAP
|
|
/*
|
|
* Migrate the MSI irq to another cpumask. This migration is
|
|
* done in the process context using interrupt-remapping hardware.
|
|
*/
|
|
static int
|
|
ir_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
|
|
bool force)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
unsigned int dest, irq = data->irq;
|
|
struct irte irte;
|
|
|
|
if (get_irte(irq, &irte))
|
|
return -1;
|
|
|
|
if (__ioapic_set_affinity(data, mask, &dest))
|
|
return -1;
|
|
|
|
irte.vector = cfg->vector;
|
|
irte.dest_id = IRTE_DEST(dest);
|
|
|
|
/*
|
|
* atomically update the IRTE with the new destination and vector.
|
|
*/
|
|
modify_irte(irq, &irte);
|
|
|
|
/*
|
|
* After this point, all the interrupts will start arriving
|
|
* at the new destination. So, time to cleanup the previous
|
|
* vector allocation.
|
|
*/
|
|
if (cfg->move_in_progress)
|
|
send_cleanup_vector(cfg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
#endif /* CONFIG_SMP */
|
|
|
|
/*
|
|
* IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
|
|
* which implement the MSI or MSI-X Capability Structure.
|
|
*/
|
|
static struct irq_chip msi_chip = {
|
|
.name = "PCI-MSI",
|
|
.irq_unmask = unmask_msi_irq,
|
|
.irq_mask = mask_msi_irq,
|
|
.irq_ack = ack_apic_edge,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = msi_set_affinity,
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
static struct irq_chip msi_ir_chip = {
|
|
.name = "IR-PCI-MSI",
|
|
.irq_unmask = unmask_msi_irq,
|
|
.irq_mask = mask_msi_irq,
|
|
#ifdef CONFIG_INTR_REMAP
|
|
.irq_ack = ir_ack_apic_edge,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = ir_msi_set_affinity,
|
|
#endif
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
/*
|
|
* Map the PCI dev to the corresponding remapping hardware unit
|
|
* and allocate 'nvec' consecutive interrupt-remapping table entries
|
|
* in it.
|
|
*/
|
|
static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
|
|
{
|
|
struct intel_iommu *iommu;
|
|
int index;
|
|
|
|
iommu = map_dev_to_ir(dev);
|
|
if (!iommu) {
|
|
printk(KERN_ERR
|
|
"Unable to map PCI %s to iommu\n", pci_name(dev));
|
|
return -ENOENT;
|
|
}
|
|
|
|
index = alloc_irte(iommu, irq, nvec);
|
|
if (index < 0) {
|
|
printk(KERN_ERR
|
|
"Unable to allocate %d IRTE for PCI %s\n", nvec,
|
|
pci_name(dev));
|
|
return -ENOSPC;
|
|
}
|
|
return index;
|
|
}
|
|
|
|
static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int irq)
|
|
{
|
|
struct msi_msg msg;
|
|
int ret;
|
|
|
|
ret = msi_compose_msg(dev, irq, &msg, -1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
set_irq_msi(irq, msidesc);
|
|
write_msi_msg(irq, &msg);
|
|
|
|
if (irq_remapped(get_irq_chip_data(irq))) {
|
|
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
|
|
set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge");
|
|
} else
|
|
set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "irq %d for MSI/MSI-X\n", irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
|
|
{
|
|
int node, ret, sub_handle, index = 0;
|
|
unsigned int irq, irq_want;
|
|
struct msi_desc *msidesc;
|
|
struct intel_iommu *iommu = NULL;
|
|
|
|
/* x86 doesn't support multiple MSI yet */
|
|
if (type == PCI_CAP_ID_MSI && nvec > 1)
|
|
return 1;
|
|
|
|
node = dev_to_node(&dev->dev);
|
|
irq_want = nr_irqs_gsi;
|
|
sub_handle = 0;
|
|
list_for_each_entry(msidesc, &dev->msi_list, list) {
|
|
irq = create_irq_nr(irq_want, node);
|
|
if (irq == 0)
|
|
return -1;
|
|
irq_want = irq + 1;
|
|
if (!intr_remapping_enabled)
|
|
goto no_ir;
|
|
|
|
if (!sub_handle) {
|
|
/*
|
|
* allocate the consecutive block of IRTE's
|
|
* for 'nvec'
|
|
*/
|
|
index = msi_alloc_irte(dev, irq, nvec);
|
|
if (index < 0) {
|
|
ret = index;
|
|
goto error;
|
|
}
|
|
} else {
|
|
iommu = map_dev_to_ir(dev);
|
|
if (!iommu) {
|
|
ret = -ENOENT;
|
|
goto error;
|
|
}
|
|
/*
|
|
* setup the mapping between the irq and the IRTE
|
|
* base index, the sub_handle pointing to the
|
|
* appropriate interrupt remap table entry.
|
|
*/
|
|
set_irte_irq(irq, iommu, index, sub_handle);
|
|
}
|
|
no_ir:
|
|
ret = setup_msi_irq(dev, msidesc, irq);
|
|
if (ret < 0)
|
|
goto error;
|
|
sub_handle++;
|
|
}
|
|
return 0;
|
|
|
|
error:
|
|
destroy_irq(irq);
|
|
return ret;
|
|
}
|
|
|
|
void native_teardown_msi_irq(unsigned int irq)
|
|
{
|
|
destroy_irq(irq);
|
|
}
|
|
|
|
#if defined (CONFIG_DMAR) || defined (CONFIG_INTR_REMAP)
|
|
#ifdef CONFIG_SMP
|
|
static int
|
|
dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
|
|
bool force)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
unsigned int dest, irq = data->irq;
|
|
struct msi_msg msg;
|
|
|
|
if (__ioapic_set_affinity(data, mask, &dest))
|
|
return -1;
|
|
|
|
dmar_msi_read(irq, &msg);
|
|
|
|
msg.data &= ~MSI_DATA_VECTOR_MASK;
|
|
msg.data |= MSI_DATA_VECTOR(cfg->vector);
|
|
msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
|
|
msg.address_lo |= MSI_ADDR_DEST_ID(dest);
|
|
|
|
dmar_msi_write(irq, &msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
static struct irq_chip dmar_msi_type = {
|
|
.name = "DMAR_MSI",
|
|
.irq_unmask = dmar_msi_unmask,
|
|
.irq_mask = dmar_msi_mask,
|
|
.irq_ack = ack_apic_edge,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = dmar_msi_set_affinity,
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
int arch_setup_dmar_msi(unsigned int irq)
|
|
{
|
|
int ret;
|
|
struct msi_msg msg;
|
|
|
|
ret = msi_compose_msg(NULL, irq, &msg, -1);
|
|
if (ret < 0)
|
|
return ret;
|
|
dmar_msi_write(irq, &msg);
|
|
set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
|
|
"edge");
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HPET_TIMER
|
|
|
|
#ifdef CONFIG_SMP
|
|
static int hpet_msi_set_affinity(struct irq_data *data,
|
|
const struct cpumask *mask, bool force)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
struct msi_msg msg;
|
|
unsigned int dest;
|
|
|
|
if (__ioapic_set_affinity(data, mask, &dest))
|
|
return -1;
|
|
|
|
hpet_msi_read(data->handler_data, &msg);
|
|
|
|
msg.data &= ~MSI_DATA_VECTOR_MASK;
|
|
msg.data |= MSI_DATA_VECTOR(cfg->vector);
|
|
msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
|
|
msg.address_lo |= MSI_ADDR_DEST_ID(dest);
|
|
|
|
hpet_msi_write(data->handler_data, &msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
|
|
static struct irq_chip ir_hpet_msi_type = {
|
|
.name = "IR-HPET_MSI",
|
|
.irq_unmask = hpet_msi_unmask,
|
|
.irq_mask = hpet_msi_mask,
|
|
#ifdef CONFIG_INTR_REMAP
|
|
.irq_ack = ir_ack_apic_edge,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = ir_msi_set_affinity,
|
|
#endif
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
static struct irq_chip hpet_msi_type = {
|
|
.name = "HPET_MSI",
|
|
.irq_unmask = hpet_msi_unmask,
|
|
.irq_mask = hpet_msi_mask,
|
|
.irq_ack = ack_apic_edge,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = hpet_msi_set_affinity,
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
|
|
{
|
|
struct msi_msg msg;
|
|
int ret;
|
|
|
|
if (intr_remapping_enabled) {
|
|
struct intel_iommu *iommu = map_hpet_to_ir(id);
|
|
int index;
|
|
|
|
if (!iommu)
|
|
return -1;
|
|
|
|
index = alloc_irte(iommu, irq, 1);
|
|
if (index < 0)
|
|
return -1;
|
|
}
|
|
|
|
ret = msi_compose_msg(NULL, irq, &msg, id);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
hpet_msi_write(get_irq_data(irq), &msg);
|
|
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
|
|
if (irq_remapped(get_irq_chip_data(irq)))
|
|
set_irq_chip_and_handler_name(irq, &ir_hpet_msi_type,
|
|
handle_edge_irq, "edge");
|
|
else
|
|
set_irq_chip_and_handler_name(irq, &hpet_msi_type,
|
|
handle_edge_irq, "edge");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_PCI_MSI */
|
|
/*
|
|
* Hypertransport interrupt support
|
|
*/
|
|
#ifdef CONFIG_HT_IRQ
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static void target_ht_irq(unsigned int irq, unsigned int dest, u8 vector)
|
|
{
|
|
struct ht_irq_msg msg;
|
|
fetch_ht_irq_msg(irq, &msg);
|
|
|
|
msg.address_lo &= ~(HT_IRQ_LOW_VECTOR_MASK | HT_IRQ_LOW_DEST_ID_MASK);
|
|
msg.address_hi &= ~(HT_IRQ_HIGH_DEST_ID_MASK);
|
|
|
|
msg.address_lo |= HT_IRQ_LOW_VECTOR(vector) | HT_IRQ_LOW_DEST_ID(dest);
|
|
msg.address_hi |= HT_IRQ_HIGH_DEST_ID(dest);
|
|
|
|
write_ht_irq_msg(irq, &msg);
|
|
}
|
|
|
|
static int
|
|
ht_set_affinity(struct irq_data *data, const struct cpumask *mask, bool force)
|
|
{
|
|
struct irq_cfg *cfg = data->chip_data;
|
|
unsigned int dest;
|
|
|
|
if (__ioapic_set_affinity(data, mask, &dest))
|
|
return -1;
|
|
|
|
target_ht_irq(data->irq, dest, cfg->vector);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
static struct irq_chip ht_irq_chip = {
|
|
.name = "PCI-HT",
|
|
.irq_mask = mask_ht_irq,
|
|
.irq_unmask = unmask_ht_irq,
|
|
.irq_ack = ack_apic_edge,
|
|
#ifdef CONFIG_SMP
|
|
.irq_set_affinity = ht_set_affinity,
|
|
#endif
|
|
.irq_retrigger = ioapic_retrigger_irq,
|
|
};
|
|
|
|
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
|
|
{
|
|
struct irq_cfg *cfg;
|
|
int err;
|
|
|
|
if (disable_apic)
|
|
return -ENXIO;
|
|
|
|
cfg = irq_cfg(irq);
|
|
err = assign_irq_vector(irq, cfg, apic->target_cpus());
|
|
if (!err) {
|
|
struct ht_irq_msg msg;
|
|
unsigned dest;
|
|
|
|
dest = apic->cpu_mask_to_apicid_and(cfg->domain,
|
|
apic->target_cpus());
|
|
|
|
msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
|
|
|
|
msg.address_lo =
|
|
HT_IRQ_LOW_BASE |
|
|
HT_IRQ_LOW_DEST_ID(dest) |
|
|
HT_IRQ_LOW_VECTOR(cfg->vector) |
|
|
((apic->irq_dest_mode == 0) ?
|
|
HT_IRQ_LOW_DM_PHYSICAL :
|
|
HT_IRQ_LOW_DM_LOGICAL) |
|
|
HT_IRQ_LOW_RQEOI_EDGE |
|
|
((apic->irq_delivery_mode != dest_LowestPrio) ?
|
|
HT_IRQ_LOW_MT_FIXED :
|
|
HT_IRQ_LOW_MT_ARBITRATED) |
|
|
HT_IRQ_LOW_IRQ_MASKED;
|
|
|
|
write_ht_irq_msg(irq, &msg);
|
|
|
|
set_irq_chip_and_handler_name(irq, &ht_irq_chip,
|
|
handle_edge_irq, "edge");
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "irq %d for HT\n", irq);
|
|
}
|
|
return err;
|
|
}
|
|
#endif /* CONFIG_HT_IRQ */
|
|
|
|
int __init io_apic_get_redir_entries (int ioapic)
|
|
{
|
|
union IO_APIC_reg_01 reg_01;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(ioapic, 1);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/* The register returns the maximum index redir index
|
|
* supported, which is one less than the total number of redir
|
|
* entries.
|
|
*/
|
|
return reg_01.bits.entries + 1;
|
|
}
|
|
|
|
void __init probe_nr_irqs_gsi(void)
|
|
{
|
|
int nr;
|
|
|
|
nr = gsi_top + NR_IRQS_LEGACY;
|
|
if (nr > nr_irqs_gsi)
|
|
nr_irqs_gsi = nr;
|
|
|
|
printk(KERN_DEBUG "nr_irqs_gsi: %d\n", nr_irqs_gsi);
|
|
}
|
|
|
|
int get_nr_irqs_gsi(void)
|
|
{
|
|
return nr_irqs_gsi;
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSE_IRQ
|
|
int __init arch_probe_nr_irqs(void)
|
|
{
|
|
int nr;
|
|
|
|
if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
|
|
nr_irqs = NR_VECTORS * nr_cpu_ids;
|
|
|
|
nr = nr_irqs_gsi + 8 * nr_cpu_ids;
|
|
#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
|
|
/*
|
|
* for MSI and HT dyn irq
|
|
*/
|
|
nr += nr_irqs_gsi * 16;
|
|
#endif
|
|
if (nr < nr_irqs)
|
|
nr_irqs = nr;
|
|
|
|
return NR_IRQS_LEGACY;
|
|
}
|
|
#endif
|
|
|
|
static int __io_apic_set_pci_routing(struct device *dev, int irq,
|
|
struct io_apic_irq_attr *irq_attr)
|
|
{
|
|
struct irq_cfg *cfg;
|
|
int node;
|
|
int ioapic, pin;
|
|
int trigger, polarity;
|
|
|
|
ioapic = irq_attr->ioapic;
|
|
if (!IO_APIC_IRQ(irq)) {
|
|
apic_printk(APIC_QUIET,KERN_ERR "IOAPIC[%d]: Invalid reference to IRQ 0\n",
|
|
ioapic);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev)
|
|
node = dev_to_node(dev);
|
|
else
|
|
node = cpu_to_node(0);
|
|
|
|
cfg = alloc_irq_and_cfg_at(irq, node);
|
|
if (!cfg)
|
|
return 0;
|
|
|
|
pin = irq_attr->ioapic_pin;
|
|
trigger = irq_attr->trigger;
|
|
polarity = irq_attr->polarity;
|
|
|
|
/*
|
|
* IRQs < 16 are already in the irq_2_pin[] map
|
|
*/
|
|
if (irq >= legacy_pic->nr_legacy_irqs) {
|
|
if (__add_pin_to_irq_node(cfg, node, ioapic, pin)) {
|
|
printk(KERN_INFO "can not add pin %d for irq %d\n",
|
|
pin, irq);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
setup_ioapic_irq(ioapic, pin, irq, cfg, trigger, polarity);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int io_apic_set_pci_routing(struct device *dev, int irq,
|
|
struct io_apic_irq_attr *irq_attr)
|
|
{
|
|
int ioapic, pin;
|
|
/*
|
|
* Avoid pin reprogramming. PRTs typically include entries
|
|
* with redundant pin->gsi mappings (but unique PCI devices);
|
|
* we only program the IOAPIC on the first.
|
|
*/
|
|
ioapic = irq_attr->ioapic;
|
|
pin = irq_attr->ioapic_pin;
|
|
if (test_bit(pin, mp_ioapic_routing[ioapic].pin_programmed)) {
|
|
pr_debug("Pin %d-%d already programmed\n",
|
|
mp_ioapics[ioapic].apicid, pin);
|
|
return 0;
|
|
}
|
|
set_bit(pin, mp_ioapic_routing[ioapic].pin_programmed);
|
|
|
|
return __io_apic_set_pci_routing(dev, irq, irq_attr);
|
|
}
|
|
|
|
u8 __init io_apic_unique_id(u8 id)
|
|
{
|
|
#ifdef CONFIG_X86_32
|
|
if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
|
|
!APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
|
|
return io_apic_get_unique_id(nr_ioapics, id);
|
|
else
|
|
return id;
|
|
#else
|
|
int i;
|
|
DECLARE_BITMAP(used, 256);
|
|
|
|
bitmap_zero(used, 256);
|
|
for (i = 0; i < nr_ioapics; i++) {
|
|
struct mpc_ioapic *ia = &mp_ioapics[i];
|
|
__set_bit(ia->apicid, used);
|
|
}
|
|
if (!test_bit(id, used))
|
|
return id;
|
|
return find_first_zero_bit(used, 256);
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
int __init io_apic_get_unique_id(int ioapic, int apic_id)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
|
|
physid_mask_t tmp;
|
|
unsigned long flags;
|
|
int i = 0;
|
|
|
|
/*
|
|
* The P4 platform supports up to 256 APIC IDs on two separate APIC
|
|
* buses (one for LAPICs, one for IOAPICs), where predecessors only
|
|
* supports up to 16 on one shared APIC bus.
|
|
*
|
|
* TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
|
|
* advantage of new APIC bus architecture.
|
|
*/
|
|
|
|
if (physids_empty(apic_id_map))
|
|
apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(ioapic, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
if (apic_id >= get_physical_broadcast()) {
|
|
printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
|
|
"%d\n", ioapic, apic_id, reg_00.bits.ID);
|
|
apic_id = reg_00.bits.ID;
|
|
}
|
|
|
|
/*
|
|
* Every APIC in a system must have a unique ID or we get lots of nice
|
|
* 'stuck on smp_invalidate_needed IPI wait' messages.
|
|
*/
|
|
if (apic->check_apicid_used(&apic_id_map, apic_id)) {
|
|
|
|
for (i = 0; i < get_physical_broadcast(); i++) {
|
|
if (!apic->check_apicid_used(&apic_id_map, i))
|
|
break;
|
|
}
|
|
|
|
if (i == get_physical_broadcast())
|
|
panic("Max apic_id exceeded!\n");
|
|
|
|
printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
|
|
"trying %d\n", ioapic, apic_id, i);
|
|
|
|
apic_id = i;
|
|
}
|
|
|
|
apic->apicid_to_cpu_present(apic_id, &tmp);
|
|
physids_or(apic_id_map, apic_id_map, tmp);
|
|
|
|
if (reg_00.bits.ID != apic_id) {
|
|
reg_00.bits.ID = apic_id;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(ioapic, 0, reg_00.raw);
|
|
reg_00.raw = io_apic_read(ioapic, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/* Sanity check */
|
|
if (reg_00.bits.ID != apic_id) {
|
|
printk("IOAPIC[%d]: Unable to change apic_id!\n", ioapic);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
|
|
|
|
return apic_id;
|
|
}
|
|
#endif
|
|
|
|
int __init io_apic_get_version(int ioapic)
|
|
{
|
|
union IO_APIC_reg_01 reg_01;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(ioapic, 1);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return reg_01.bits.version;
|
|
}
|
|
|
|
int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
|
|
{
|
|
int ioapic, pin, idx;
|
|
|
|
if (skip_ioapic_setup)
|
|
return -1;
|
|
|
|
ioapic = mp_find_ioapic(gsi);
|
|
if (ioapic < 0)
|
|
return -1;
|
|
|
|
pin = mp_find_ioapic_pin(ioapic, gsi);
|
|
if (pin < 0)
|
|
return -1;
|
|
|
|
idx = find_irq_entry(ioapic, pin, mp_INT);
|
|
if (idx < 0)
|
|
return -1;
|
|
|
|
*trigger = irq_trigger(idx);
|
|
*polarity = irq_polarity(idx);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function currently is only a helper for the i386 smp boot process where
|
|
* we need to reprogram the ioredtbls to cater for the cpus which have come online
|
|
* so mask in all cases should simply be apic->target_cpus()
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
void __init setup_ioapic_dest(void)
|
|
{
|
|
int pin, ioapic, irq, irq_entry;
|
|
struct irq_desc *desc;
|
|
const struct cpumask *mask;
|
|
|
|
if (skip_ioapic_setup == 1)
|
|
return;
|
|
|
|
for (ioapic = 0; ioapic < nr_ioapics; ioapic++)
|
|
for (pin = 0; pin < nr_ioapic_registers[ioapic]; pin++) {
|
|
irq_entry = find_irq_entry(ioapic, pin, mp_INT);
|
|
if (irq_entry == -1)
|
|
continue;
|
|
irq = pin_2_irq(irq_entry, ioapic, pin);
|
|
|
|
if ((ioapic > 0) && (irq > 16))
|
|
continue;
|
|
|
|
desc = irq_to_desc(irq);
|
|
|
|
/*
|
|
* Honour affinities which have been set in early boot
|
|
*/
|
|
if (desc->status &
|
|
(IRQ_NO_BALANCING | IRQ_AFFINITY_SET))
|
|
mask = desc->irq_data.affinity;
|
|
else
|
|
mask = apic->target_cpus();
|
|
|
|
if (intr_remapping_enabled)
|
|
ir_ioapic_set_affinity(&desc->irq_data, mask, false);
|
|
else
|
|
ioapic_set_affinity(&desc->irq_data, mask, false);
|
|
}
|
|
|
|
}
|
|
#endif
|
|
|
|
#define IOAPIC_RESOURCE_NAME_SIZE 11
|
|
|
|
static struct resource *ioapic_resources;
|
|
|
|
static struct resource * __init ioapic_setup_resources(int nr_ioapics)
|
|
{
|
|
unsigned long n;
|
|
struct resource *res;
|
|
char *mem;
|
|
int i;
|
|
|
|
if (nr_ioapics <= 0)
|
|
return NULL;
|
|
|
|
n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
|
|
n *= nr_ioapics;
|
|
|
|
mem = alloc_bootmem(n);
|
|
res = (void *)mem;
|
|
|
|
mem += sizeof(struct resource) * nr_ioapics;
|
|
|
|
for (i = 0; i < nr_ioapics; i++) {
|
|
res[i].name = mem;
|
|
res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
|
|
mem += IOAPIC_RESOURCE_NAME_SIZE;
|
|
}
|
|
|
|
ioapic_resources = res;
|
|
|
|
return res;
|
|
}
|
|
|
|
void __init ioapic_init_mappings(void)
|
|
{
|
|
unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
|
|
struct resource *ioapic_res;
|
|
int i;
|
|
|
|
ioapic_res = ioapic_setup_resources(nr_ioapics);
|
|
for (i = 0; i < nr_ioapics; i++) {
|
|
if (smp_found_config) {
|
|
ioapic_phys = mp_ioapics[i].apicaddr;
|
|
#ifdef CONFIG_X86_32
|
|
if (!ioapic_phys) {
|
|
printk(KERN_ERR
|
|
"WARNING: bogus zero IO-APIC "
|
|
"address found in MPTABLE, "
|
|
"disabling IO/APIC support!\n");
|
|
smp_found_config = 0;
|
|
skip_ioapic_setup = 1;
|
|
goto fake_ioapic_page;
|
|
}
|
|
#endif
|
|
} else {
|
|
#ifdef CONFIG_X86_32
|
|
fake_ioapic_page:
|
|
#endif
|
|
ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
|
|
ioapic_phys = __pa(ioapic_phys);
|
|
}
|
|
set_fixmap_nocache(idx, ioapic_phys);
|
|
apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
|
|
__fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
|
|
ioapic_phys);
|
|
idx++;
|
|
|
|
ioapic_res->start = ioapic_phys;
|
|
ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
|
|
ioapic_res++;
|
|
}
|
|
}
|
|
|
|
void __init ioapic_insert_resources(void)
|
|
{
|
|
int i;
|
|
struct resource *r = ioapic_resources;
|
|
|
|
if (!r) {
|
|
if (nr_ioapics > 0)
|
|
printk(KERN_ERR
|
|
"IO APIC resources couldn't be allocated.\n");
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < nr_ioapics; i++) {
|
|
insert_resource(&iomem_resource, r);
|
|
r++;
|
|
}
|
|
}
|
|
|
|
int mp_find_ioapic(u32 gsi)
|
|
{
|
|
int i = 0;
|
|
|
|
/* Find the IOAPIC that manages this GSI. */
|
|
for (i = 0; i < nr_ioapics; i++) {
|
|
if ((gsi >= mp_gsi_routing[i].gsi_base)
|
|
&& (gsi <= mp_gsi_routing[i].gsi_end))
|
|
return i;
|
|
}
|
|
|
|
printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
|
|
return -1;
|
|
}
|
|
|
|
int mp_find_ioapic_pin(int ioapic, u32 gsi)
|
|
{
|
|
if (WARN_ON(ioapic == -1))
|
|
return -1;
|
|
if (WARN_ON(gsi > mp_gsi_routing[ioapic].gsi_end))
|
|
return -1;
|
|
|
|
return gsi - mp_gsi_routing[ioapic].gsi_base;
|
|
}
|
|
|
|
static int bad_ioapic(unsigned long address)
|
|
{
|
|
if (nr_ioapics >= MAX_IO_APICS) {
|
|
printk(KERN_WARNING "WARING: Max # of I/O APICs (%d) exceeded "
|
|
"(found %d), skipping\n", MAX_IO_APICS, nr_ioapics);
|
|
return 1;
|
|
}
|
|
if (!address) {
|
|
printk(KERN_WARNING "WARNING: Bogus (zero) I/O APIC address"
|
|
" found in table, skipping!\n");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
|
|
{
|
|
int idx = 0;
|
|
int entries;
|
|
|
|
if (bad_ioapic(address))
|
|
return;
|
|
|
|
idx = nr_ioapics;
|
|
|
|
mp_ioapics[idx].type = MP_IOAPIC;
|
|
mp_ioapics[idx].flags = MPC_APIC_USABLE;
|
|
mp_ioapics[idx].apicaddr = address;
|
|
|
|
set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
|
|
mp_ioapics[idx].apicid = io_apic_unique_id(id);
|
|
mp_ioapics[idx].apicver = io_apic_get_version(idx);
|
|
|
|
/*
|
|
* Build basic GSI lookup table to facilitate gsi->io_apic lookups
|
|
* and to prevent reprogramming of IOAPIC pins (PCI GSIs).
|
|
*/
|
|
entries = io_apic_get_redir_entries(idx);
|
|
mp_gsi_routing[idx].gsi_base = gsi_base;
|
|
mp_gsi_routing[idx].gsi_end = gsi_base + entries - 1;
|
|
|
|
/*
|
|
* The number of IO-APIC IRQ registers (== #pins):
|
|
*/
|
|
nr_ioapic_registers[idx] = entries;
|
|
|
|
if (mp_gsi_routing[idx].gsi_end >= gsi_top)
|
|
gsi_top = mp_gsi_routing[idx].gsi_end + 1;
|
|
|
|
printk(KERN_INFO "IOAPIC[%d]: apic_id %d, version %d, address 0x%x, "
|
|
"GSI %d-%d\n", idx, mp_ioapics[idx].apicid,
|
|
mp_ioapics[idx].apicver, mp_ioapics[idx].apicaddr,
|
|
mp_gsi_routing[idx].gsi_base, mp_gsi_routing[idx].gsi_end);
|
|
|
|
nr_ioapics++;
|
|
}
|
|
|
|
/* Enable IOAPIC early just for system timer */
|
|
void __init pre_init_apic_IRQ0(void)
|
|
{
|
|
struct irq_cfg *cfg;
|
|
|
|
printk(KERN_INFO "Early APIC setup for system timer0\n");
|
|
#ifndef CONFIG_SMP
|
|
phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
|
|
#endif
|
|
/* Make sure the irq descriptor is set up */
|
|
cfg = alloc_irq_and_cfg_at(0, 0);
|
|
|
|
setup_local_APIC();
|
|
|
|
add_pin_to_irq_node(cfg, 0, 0, 0);
|
|
set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
|
|
|
|
setup_ioapic_irq(0, 0, 0, cfg, 0, 0);
|
|
}
|