![Thomas Gleixner](/assets/img/avatar_default.png)
apic_noop is used to provide dummy apic functions. It's installed when the CPU has no APIC or when the APIC is disabled on the kernel command line. The apic_noop implementation of apic_write() warns when the CPU has an APIC or when the APIC is not disabled. That's bogus. The warning should only happen when the CPU has an APIC _AND_ the APIC is not disabled. apic_noop.apic_read() has the correct check. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: <stable@kernel.org> # in <= .32 this typo resides in native_apic_write_dummy() LKML-Reference: <alpine.LFD.2.00.0912071255420.3089@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
201 lines
4.7 KiB
C
201 lines
4.7 KiB
C
/*
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* NOOP APIC driver.
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*
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* Does almost nothing and should be substituted by a real apic driver via
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* probe routine.
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*
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* Though in case if apic is disabled (for some reason) we try
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* to not uglify the caller's code and allow to call (some) apic routines
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* like self-ipi, etc...
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*/
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <asm/fixmap.h>
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#include <asm/mpspec.h>
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#include <asm/apicdef.h>
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#include <asm/apic.h>
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#include <asm/setup.h>
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#include <linux/smp.h>
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#include <asm/ipi.h>
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#include <linux/interrupt.h>
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#include <asm/acpi.h>
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#include <asm/e820.h>
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static void noop_init_apic_ldr(void) { }
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static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { }
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static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { }
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static void noop_send_IPI_allbutself(int vector) { }
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static void noop_send_IPI_all(int vector) { }
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static void noop_send_IPI_self(int vector) { }
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static void noop_apic_wait_icr_idle(void) { }
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static void noop_apic_icr_write(u32 low, u32 id) { }
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static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip)
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{
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return -1;
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}
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static u32 noop_safe_apic_wait_icr_idle(void)
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{
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return 0;
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}
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static u64 noop_apic_icr_read(void)
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{
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return 0;
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}
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static int noop_cpu_to_logical_apicid(int cpu)
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{
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return 0;
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}
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static int noop_phys_pkg_id(int cpuid_apic, int index_msb)
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{
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return 0;
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}
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static unsigned int noop_get_apic_id(unsigned long x)
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{
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return 0;
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}
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static int noop_probe(void)
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{
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/*
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* NOOP apic should not ever be
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* enabled via probe routine
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*/
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return 0;
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}
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static int noop_apic_id_registered(void)
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{
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/*
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* if we would be really "pedantic"
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* we should pass read_apic_id() here
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* but since NOOP suppose APIC ID = 0
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* lets save a few cycles
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*/
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return physid_isset(0, phys_cpu_present_map);
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}
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static const struct cpumask *noop_target_cpus(void)
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{
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/* only BSP here */
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return cpumask_of(0);
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}
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static unsigned long noop_check_apicid_used(physid_mask_t *map, int apicid)
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{
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return physid_isset(apicid, *map);
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}
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static unsigned long noop_check_apicid_present(int bit)
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{
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return physid_isset(bit, phys_cpu_present_map);
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}
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static void noop_vector_allocation_domain(int cpu, struct cpumask *retmask)
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{
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if (cpu != 0)
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pr_warning("APIC: Vector allocated for non-BSP cpu\n");
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cpumask_clear(retmask);
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cpumask_set_cpu(cpu, retmask);
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}
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int noop_apicid_to_node(int logical_apicid)
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{
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/* we're always on node 0 */
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return 0;
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}
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static u32 noop_apic_read(u32 reg)
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{
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WARN_ON_ONCE((cpu_has_apic && !disable_apic));
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return 0;
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}
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static void noop_apic_write(u32 reg, u32 v)
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{
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WARN_ON_ONCE(cpu_has_apic && !disable_apic);
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}
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struct apic apic_noop = {
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.name = "noop",
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.probe = noop_probe,
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.acpi_madt_oem_check = NULL,
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.apic_id_registered = noop_apic_id_registered,
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.irq_delivery_mode = dest_LowestPrio,
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/* logical delivery broadcast to all CPUs: */
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.irq_dest_mode = 1,
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.target_cpus = noop_target_cpus,
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.disable_esr = 0,
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.dest_logical = APIC_DEST_LOGICAL,
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.check_apicid_used = noop_check_apicid_used,
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.check_apicid_present = noop_check_apicid_present,
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.vector_allocation_domain = noop_vector_allocation_domain,
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.init_apic_ldr = noop_init_apic_ldr,
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.ioapic_phys_id_map = default_ioapic_phys_id_map,
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.setup_apic_routing = NULL,
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.multi_timer_check = NULL,
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.apicid_to_node = noop_apicid_to_node,
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.cpu_to_logical_apicid = noop_cpu_to_logical_apicid,
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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.apicid_to_cpu_present = physid_set_mask_of_physid,
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.setup_portio_remap = NULL,
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.check_phys_apicid_present = default_check_phys_apicid_present,
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.enable_apic_mode = NULL,
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.phys_pkg_id = noop_phys_pkg_id,
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.mps_oem_check = NULL,
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.get_apic_id = noop_get_apic_id,
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.set_apic_id = NULL,
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.apic_id_mask = 0x0F << 24,
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.cpu_mask_to_apicid = default_cpu_mask_to_apicid,
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.cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
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.send_IPI_mask = noop_send_IPI_mask,
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.send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself,
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.send_IPI_allbutself = noop_send_IPI_allbutself,
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.send_IPI_all = noop_send_IPI_all,
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.send_IPI_self = noop_send_IPI_self,
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.wakeup_secondary_cpu = noop_wakeup_secondary_cpu,
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/* should be safe */
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.trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
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.trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
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.wait_for_init_deassert = NULL,
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.smp_callin_clear_local_apic = NULL,
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.inquire_remote_apic = NULL,
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.read = noop_apic_read,
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.write = noop_apic_write,
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.icr_read = noop_apic_icr_read,
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.icr_write = noop_apic_icr_write,
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.wait_icr_idle = noop_apic_wait_icr_idle,
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.safe_wait_icr_idle = noop_safe_apic_wait_icr_idle,
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};
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