![Alexey Dobriyan](/assets/img/avatar_default.png)
Remove fs.h from mm.h. For this, 1) Uninline vma_wants_writenotify(). It's pretty huge anyway. 2) Add back fs.h or less bloated headers (err.h) to files that need it. As result, on x86_64 allyesconfig, fs.h dependencies cut down from 3929 files rebuilt down to 3444 (-12.3%). Cross-compile tested without regressions on my two usual configs and (sigh): alpha arm-mx1ads mips-bigsur powerpc-ebony alpha-allnoconfig arm-neponset mips-capcella powerpc-g5 alpha-defconfig arm-netwinder mips-cobalt powerpc-holly alpha-up arm-netx mips-db1000 powerpc-iseries arm arm-ns9xxx mips-db1100 powerpc-linkstation arm-assabet arm-omap_h2_1610 mips-db1200 powerpc-lite5200 arm-at91rm9200dk arm-onearm mips-db1500 powerpc-maple arm-at91rm9200ek arm-picotux200 mips-db1550 powerpc-mpc7448_hpc2 arm-at91sam9260ek arm-pleb mips-ddb5477 powerpc-mpc8272_ads arm-at91sam9261ek arm-pnx4008 mips-decstation powerpc-mpc8313_rdb arm-at91sam9263ek arm-pxa255-idp mips-e55 powerpc-mpc832x_mds arm-at91sam9rlek arm-realview mips-emma2rh powerpc-mpc832x_rdb arm-ateb9200 arm-realview-smp mips-excite powerpc-mpc834x_itx arm-badge4 arm-rpc mips-fulong powerpc-mpc834x_itxgp arm-carmeva arm-s3c2410 mips-ip22 powerpc-mpc834x_mds arm-cerfcube arm-shannon mips-ip27 powerpc-mpc836x_mds arm-clps7500 arm-shark mips-ip32 powerpc-mpc8540_ads arm-collie arm-simpad mips-jazz powerpc-mpc8544_ds arm-corgi arm-spitz mips-jmr3927 powerpc-mpc8560_ads arm-csb337 arm-trizeps4 mips-malta powerpc-mpc8568mds arm-csb637 arm-versatile mips-mipssim powerpc-mpc85xx_cds arm-ebsa110 i386 mips-mpc30x powerpc-mpc8641_hpcn arm-edb7211 i386-allnoconfig mips-msp71xx powerpc-mpc866_ads arm-em_x270 i386-defconfig mips-ocelot powerpc-mpc885_ads arm-ep93xx i386-up mips-pb1100 powerpc-pasemi arm-footbridge ia64 mips-pb1500 powerpc-pmac32 arm-fortunet ia64-allnoconfig mips-pb1550 powerpc-ppc64 arm-h3600 ia64-bigsur mips-pnx8550-jbs powerpc-prpmc2800 arm-h7201 ia64-defconfig mips-pnx8550-stb810 powerpc-ps3 arm-h7202 ia64-gensparse mips-qemu powerpc-pseries arm-hackkit ia64-sim mips-rbhma4200 powerpc-up arm-integrator ia64-sn2 mips-rbhma4500 s390 arm-iop13xx ia64-tiger mips-rm200 s390-allnoconfig arm-iop32x ia64-up mips-sb1250-swarm s390-defconfig arm-iop33x ia64-zx1 mips-sead s390-up arm-ixp2000 m68k mips-tb0219 sparc arm-ixp23xx m68k-amiga mips-tb0226 sparc-allnoconfig arm-ixp4xx m68k-apollo mips-tb0287 sparc-defconfig arm-jornada720 m68k-atari mips-workpad sparc-up arm-kafa m68k-bvme6000 mips-wrppmc sparc64 arm-kb9202 m68k-hp300 mips-yosemite sparc64-allnoconfig arm-ks8695 m68k-mac parisc sparc64-defconfig arm-lart m68k-mvme147 parisc-allnoconfig sparc64-up arm-lpd270 m68k-mvme16x parisc-defconfig um-x86_64 arm-lpd7a400 m68k-q40 parisc-up x86_64 arm-lpd7a404 m68k-sun3 powerpc x86_64-allnoconfig arm-lubbock m68k-sun3x powerpc-cell x86_64-defconfig arm-lusl7200 mips powerpc-celleb x86_64-up arm-mainstone mips-atlas powerpc-chrp32 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
804 lines
19 KiB
C
804 lines
19 KiB
C
/*
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* arch/s390/kernel/smp.c
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*
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* Copyright IBM Corp. 1999,2007
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* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Heiko Carstens (heiko.carstens@de.ibm.com)
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*
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* based on other smp stuff by
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* (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net>
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* (c) 1998 Ingo Molnar
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*
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* We work with logical cpu numbering everywhere we can. The only
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* functions using the real cpu address (got from STAP) are the sigp
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* functions. For all other functions we use the identity mapping.
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* That means that cpu_number_map[i] == i for every cpu. cpu_number_map is
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* used e.g. to find the idle task belonging to a logical cpu. Every array
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* in the kernel is sorted by the logical cpu number and not by the physical
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* one which is causing all the confusion with __cpu_logical_map and
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* cpu_number_map in other architectures.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/err.h>
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#include <linux/spinlock.h>
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#include <linux/kernel_stat.h>
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#include <linux/delay.h>
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#include <linux/cache.h>
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#include <linux/interrupt.h>
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#include <linux/cpu.h>
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#include <linux/timex.h>
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#include <linux/bootmem.h>
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#include <asm/ipl.h>
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#include <asm/setup.h>
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#include <asm/sigp.h>
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#include <asm/pgalloc.h>
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#include <asm/irq.h>
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#include <asm/s390_ext.h>
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#include <asm/cpcmd.h>
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#include <asm/tlbflush.h>
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#include <asm/timer.h>
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#include <asm/lowcore.h>
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/*
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* An array with a pointer the lowcore of every CPU.
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*/
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struct _lowcore *lowcore_ptr[NR_CPUS];
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EXPORT_SYMBOL(lowcore_ptr);
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cpumask_t cpu_online_map = CPU_MASK_NONE;
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EXPORT_SYMBOL(cpu_online_map);
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cpumask_t cpu_possible_map = CPU_MASK_NONE;
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EXPORT_SYMBOL(cpu_possible_map);
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static struct task_struct *current_set[NR_CPUS];
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static void smp_ext_bitcall(int, ec_bit_sig);
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/*
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* Structure and data for __smp_call_function_map(). This is designed to
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* minimise static memory requirements. It also looks cleaner.
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*/
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static DEFINE_SPINLOCK(call_lock);
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struct call_data_struct {
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void (*func) (void *info);
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void *info;
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cpumask_t started;
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cpumask_t finished;
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int wait;
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};
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static struct call_data_struct *call_data;
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/*
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* 'Call function' interrupt callback
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*/
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static void do_call_function(void)
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{
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void (*func) (void *info) = call_data->func;
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void *info = call_data->info;
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int wait = call_data->wait;
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cpu_set(smp_processor_id(), call_data->started);
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(*func)(info);
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if (wait)
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cpu_set(smp_processor_id(), call_data->finished);;
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}
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static void __smp_call_function_map(void (*func) (void *info), void *info,
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int nonatomic, int wait, cpumask_t map)
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{
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struct call_data_struct data;
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int cpu, local = 0;
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/*
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* Can deadlock when interrupts are disabled or if in wrong context.
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*/
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WARN_ON(irqs_disabled() || in_irq());
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/*
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* Check for local function call. We have to have the same call order
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* as in on_each_cpu() because of machine_restart_smp().
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*/
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if (cpu_isset(smp_processor_id(), map)) {
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local = 1;
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cpu_clear(smp_processor_id(), map);
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}
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cpus_and(map, map, cpu_online_map);
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if (cpus_empty(map))
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goto out;
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data.func = func;
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data.info = info;
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data.started = CPU_MASK_NONE;
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data.wait = wait;
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if (wait)
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data.finished = CPU_MASK_NONE;
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spin_lock(&call_lock);
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call_data = &data;
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for_each_cpu_mask(cpu, map)
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smp_ext_bitcall(cpu, ec_call_function);
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/* Wait for response */
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while (!cpus_equal(map, data.started))
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cpu_relax();
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if (wait)
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while (!cpus_equal(map, data.finished))
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cpu_relax();
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spin_unlock(&call_lock);
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out:
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if (local) {
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local_irq_disable();
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func(info);
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local_irq_enable();
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}
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}
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/*
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* smp_call_function:
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* @func: the function to run; this must be fast and non-blocking
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* @info: an arbitrary pointer to pass to the function
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* @nonatomic: unused
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* @wait: if true, wait (atomically) until function has completed on other CPUs
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*
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* Run a function on all other CPUs.
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*
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* You must not call this function with disabled interrupts, from a
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* hardware interrupt handler or from a bottom half.
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*/
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int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
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int wait)
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{
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cpumask_t map;
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preempt_disable();
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map = cpu_online_map;
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cpu_clear(smp_processor_id(), map);
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__smp_call_function_map(func, info, nonatomic, wait, map);
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preempt_enable();
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return 0;
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}
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EXPORT_SYMBOL(smp_call_function);
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/*
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* smp_call_function_single:
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* @cpu: the CPU where func should run
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* @func: the function to run; this must be fast and non-blocking
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* @info: an arbitrary pointer to pass to the function
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* @nonatomic: unused
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* @wait: if true, wait (atomically) until function has completed on other CPUs
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*
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* Run a function on one processor.
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*
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* You must not call this function with disabled interrupts, from a
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* hardware interrupt handler or from a bottom half.
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*/
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int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
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int nonatomic, int wait)
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{
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preempt_disable();
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__smp_call_function_map(func, info, nonatomic, wait,
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cpumask_of_cpu(cpu));
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preempt_enable();
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return 0;
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}
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EXPORT_SYMBOL(smp_call_function_single);
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static void do_send_stop(void)
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{
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int cpu, rc;
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/* stop all processors */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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do {
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rc = signal_processor(cpu, sigp_stop);
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} while (rc == sigp_busy);
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}
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}
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static void do_store_status(void)
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{
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int cpu, rc;
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/* store status of all processors in their lowcores (real 0) */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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do {
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rc = signal_processor_p(
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(__u32)(unsigned long) lowcore_ptr[cpu], cpu,
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sigp_store_status_at_address);
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} while (rc == sigp_busy);
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}
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}
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static void do_wait_for_stop(void)
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{
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int cpu;
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/* Wait for all other cpus to enter stopped state */
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for_each_online_cpu(cpu) {
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if (cpu == smp_processor_id())
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continue;
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while (!smp_cpu_not_running(cpu))
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cpu_relax();
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}
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}
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/*
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* this function sends a 'stop' sigp to all other CPUs in the system.
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* it goes straight through.
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*/
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void smp_send_stop(void)
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{
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/* Disable all interrupts/machine checks */
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__load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
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/* write magic number to zero page (absolute 0) */
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lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC;
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/* stop other processors. */
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do_send_stop();
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/* wait until other processors are stopped */
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do_wait_for_stop();
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/* store status of other processors. */
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do_store_status();
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}
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/*
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* Reboot, halt and power_off routines for SMP.
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*/
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void machine_restart_smp(char *__unused)
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{
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smp_send_stop();
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do_reipl();
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}
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void machine_halt_smp(void)
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{
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smp_send_stop();
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if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
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__cpcmd(vmhalt_cmd, NULL, 0, NULL);
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signal_processor(smp_processor_id(), sigp_stop_and_store_status);
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for (;;);
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}
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void machine_power_off_smp(void)
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{
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smp_send_stop();
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if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
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__cpcmd(vmpoff_cmd, NULL, 0, NULL);
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signal_processor(smp_processor_id(), sigp_stop_and_store_status);
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for (;;);
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}
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/*
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* This is the main routine where commands issued by other
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* cpus are handled.
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*/
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static void do_ext_call_interrupt(__u16 code)
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{
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unsigned long bits;
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/*
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* handle bit signal external calls
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*
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* For the ec_schedule signal we have to do nothing. All the work
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* is done automatically when we return from the interrupt.
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*/
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bits = xchg(&S390_lowcore.ext_call_fast, 0);
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if (test_bit(ec_call_function, &bits))
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do_call_function();
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}
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/*
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* Send an external call sigp to another cpu and return without waiting
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* for its completion.
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*/
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static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
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{
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/*
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* Set signaling bit in lowcore of target cpu and kick it
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*/
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set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
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while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy)
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udelay(10);
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}
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#ifndef CONFIG_64BIT
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/*
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* this function sends a 'purge tlb' signal to another CPU.
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*/
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void smp_ptlb_callback(void *info)
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{
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local_flush_tlb();
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}
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void smp_ptlb_all(void)
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{
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on_each_cpu(smp_ptlb_callback, NULL, 0, 1);
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}
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EXPORT_SYMBOL(smp_ptlb_all);
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#endif /* ! CONFIG_64BIT */
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/*
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* this function sends a 'reschedule' IPI to another CPU.
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* it goes straight through and wastes no time serializing
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* anything. Worst case is that we lose a reschedule ...
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*/
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void smp_send_reschedule(int cpu)
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{
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smp_ext_bitcall(cpu, ec_schedule);
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}
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/*
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* parameter area for the set/clear control bit callbacks
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*/
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struct ec_creg_mask_parms {
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unsigned long orvals[16];
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unsigned long andvals[16];
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};
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/*
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* callback for setting/clearing control bits
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*/
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static void smp_ctl_bit_callback(void *info)
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{
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struct ec_creg_mask_parms *pp = info;
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unsigned long cregs[16];
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int i;
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__ctl_store(cregs, 0, 15);
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for (i = 0; i <= 15; i++)
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cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i];
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__ctl_load(cregs, 0, 15);
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}
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/*
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* Set a bit in a control register of all cpus
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*/
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void smp_ctl_set_bit(int cr, int bit)
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{
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struct ec_creg_mask_parms parms;
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memset(&parms.orvals, 0, sizeof(parms.orvals));
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memset(&parms.andvals, 0xff, sizeof(parms.andvals));
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parms.orvals[cr] = 1 << bit;
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on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1);
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}
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EXPORT_SYMBOL(smp_ctl_set_bit);
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/*
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* Clear a bit in a control register of all cpus
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*/
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void smp_ctl_clear_bit(int cr, int bit)
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{
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struct ec_creg_mask_parms parms;
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memset(&parms.orvals, 0, sizeof(parms.orvals));
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memset(&parms.andvals, 0xff, sizeof(parms.andvals));
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parms.andvals[cr] = ~(1L << bit);
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on_each_cpu(smp_ctl_bit_callback, &parms, 0, 1);
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}
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EXPORT_SYMBOL(smp_ctl_clear_bit);
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#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
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/*
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* zfcpdump_prefix_array holds prefix registers for the following scenario:
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* 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to
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* save its prefix registers, since they get lost, when switching from 31 bit
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* to 64 bit.
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*/
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unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \
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__attribute__((__section__(".data")));
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static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
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{
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if (ipl_info.type != IPL_TYPE_FCP_DUMP)
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return;
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if (cpu >= NR_CPUS) {
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printk(KERN_WARNING "Registers for cpu %i not saved since dump "
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"kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS);
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return;
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}
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zfcpdump_save_areas[cpu] = alloc_bootmem(sizeof(union save_area));
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__cpu_logical_map[1] = (__u16) phy_cpu;
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while (signal_processor(1, sigp_stop_and_store_status) == sigp_busy)
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cpu_relax();
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memcpy(zfcpdump_save_areas[cpu],
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(void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
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SAVE_AREA_SIZE);
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#ifdef CONFIG_64BIT
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/* copy original prefix register */
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zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu];
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#endif
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}
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union save_area *zfcpdump_save_areas[NR_CPUS + 1];
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EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
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#else
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static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { }
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#endif /* CONFIG_ZFCPDUMP || CONFIG_ZFCPDUMP_MODULE */
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/*
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|
* Lets check how many CPUs we have.
|
|
*/
|
|
static unsigned int __init smp_count_cpus(void)
|
|
{
|
|
unsigned int cpu, num_cpus;
|
|
__u16 boot_cpu_addr;
|
|
|
|
/*
|
|
* cpu 0 is the boot cpu. See smp_prepare_boot_cpu.
|
|
*/
|
|
boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
|
|
current_thread_info()->cpu = 0;
|
|
num_cpus = 1;
|
|
for (cpu = 0; cpu <= 65535; cpu++) {
|
|
if ((__u16) cpu == boot_cpu_addr)
|
|
continue;
|
|
__cpu_logical_map[1] = (__u16) cpu;
|
|
if (signal_processor(1, sigp_sense) == sigp_not_operational)
|
|
continue;
|
|
smp_get_save_area(num_cpus, cpu);
|
|
num_cpus++;
|
|
}
|
|
printk("Detected %d CPU's\n", (int) num_cpus);
|
|
printk("Boot cpu address %2X\n", boot_cpu_addr);
|
|
return num_cpus;
|
|
}
|
|
|
|
/*
|
|
* Activate a secondary processor.
|
|
*/
|
|
int __cpuinit start_secondary(void *cpuvoid)
|
|
{
|
|
/* Setup the cpu */
|
|
cpu_init();
|
|
preempt_disable();
|
|
/* Enable TOD clock interrupts on the secondary cpu. */
|
|
init_cpu_timer();
|
|
#ifdef CONFIG_VIRT_TIMER
|
|
/* Enable cpu timer interrupts on the secondary cpu. */
|
|
init_cpu_vtimer();
|
|
#endif
|
|
/* Enable pfault pseudo page faults on this cpu. */
|
|
pfault_init();
|
|
|
|
/* Mark this cpu as online */
|
|
cpu_set(smp_processor_id(), cpu_online_map);
|
|
/* Switch on interrupts */
|
|
local_irq_enable();
|
|
/* Print info about this processor */
|
|
print_cpu_info(&S390_lowcore.cpu_data);
|
|
/* cpu_idle will call schedule for us */
|
|
cpu_idle();
|
|
return 0;
|
|
}
|
|
|
|
static void __init smp_create_idle(unsigned int cpu)
|
|
{
|
|
struct task_struct *p;
|
|
|
|
/*
|
|
* don't care about the psw and regs settings since we'll never
|
|
* reschedule the forked task.
|
|
*/
|
|
p = fork_idle(cpu);
|
|
if (IS_ERR(p))
|
|
panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p));
|
|
current_set[cpu] = p;
|
|
}
|
|
|
|
static int cpu_stopped(int cpu)
|
|
{
|
|
__u32 status;
|
|
|
|
/* Check for stopped state */
|
|
if (signal_processor_ps(&status, 0, cpu, sigp_sense) ==
|
|
sigp_status_stored) {
|
|
if (status & 0x40)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Upping and downing of CPUs */
|
|
|
|
int __cpu_up(unsigned int cpu)
|
|
{
|
|
struct task_struct *idle;
|
|
struct _lowcore *cpu_lowcore;
|
|
struct stack_frame *sf;
|
|
sigp_ccode ccode;
|
|
int curr_cpu;
|
|
|
|
for (curr_cpu = 0; curr_cpu <= 65535; curr_cpu++) {
|
|
__cpu_logical_map[cpu] = (__u16) curr_cpu;
|
|
if (cpu_stopped(cpu))
|
|
break;
|
|
}
|
|
|
|
if (!cpu_stopped(cpu))
|
|
return -ENODEV;
|
|
|
|
ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]),
|
|
cpu, sigp_set_prefix);
|
|
if (ccode) {
|
|
printk("sigp_set_prefix failed for cpu %d "
|
|
"with condition code %d\n",
|
|
(int) cpu, (int) ccode);
|
|
return -EIO;
|
|
}
|
|
|
|
idle = current_set[cpu];
|
|
cpu_lowcore = lowcore_ptr[cpu];
|
|
cpu_lowcore->kernel_stack = (unsigned long)
|
|
task_stack_page(idle) + THREAD_SIZE;
|
|
sf = (struct stack_frame *) (cpu_lowcore->kernel_stack
|
|
- sizeof(struct pt_regs)
|
|
- sizeof(struct stack_frame));
|
|
memset(sf, 0, sizeof(struct stack_frame));
|
|
sf->gprs[9] = (unsigned long) sf;
|
|
cpu_lowcore->save_area[15] = (unsigned long) sf;
|
|
__ctl_store(cpu_lowcore->cregs_save_area[0], 0, 15);
|
|
asm volatile(
|
|
" stam 0,15,0(%0)"
|
|
: : "a" (&cpu_lowcore->access_regs_save_area) : "memory");
|
|
cpu_lowcore->percpu_offset = __per_cpu_offset[cpu];
|
|
cpu_lowcore->current_task = (unsigned long) idle;
|
|
cpu_lowcore->cpu_data.cpu_nr = cpu;
|
|
eieio();
|
|
|
|
while (signal_processor(cpu, sigp_restart) == sigp_busy)
|
|
udelay(10);
|
|
|
|
while (!cpu_online(cpu))
|
|
cpu_relax();
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int __initdata additional_cpus;
|
|
static unsigned int __initdata possible_cpus;
|
|
|
|
void __init smp_setup_cpu_possible_map(void)
|
|
{
|
|
unsigned int phy_cpus, pos_cpus, cpu;
|
|
|
|
phy_cpus = smp_count_cpus();
|
|
pos_cpus = min(phy_cpus + additional_cpus, (unsigned int) NR_CPUS);
|
|
|
|
if (possible_cpus)
|
|
pos_cpus = min(possible_cpus, (unsigned int) NR_CPUS);
|
|
|
|
for (cpu = 0; cpu < pos_cpus; cpu++)
|
|
cpu_set(cpu, cpu_possible_map);
|
|
|
|
phy_cpus = min(phy_cpus, pos_cpus);
|
|
|
|
for (cpu = 0; cpu < phy_cpus; cpu++)
|
|
cpu_set(cpu, cpu_present_map);
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
static int __init setup_additional_cpus(char *s)
|
|
{
|
|
additional_cpus = simple_strtoul(s, NULL, 0);
|
|
return 0;
|
|
}
|
|
early_param("additional_cpus", setup_additional_cpus);
|
|
|
|
static int __init setup_possible_cpus(char *s)
|
|
{
|
|
possible_cpus = simple_strtoul(s, NULL, 0);
|
|
return 0;
|
|
}
|
|
early_param("possible_cpus", setup_possible_cpus);
|
|
|
|
int __cpu_disable(void)
|
|
{
|
|
struct ec_creg_mask_parms cr_parms;
|
|
int cpu = smp_processor_id();
|
|
|
|
cpu_clear(cpu, cpu_online_map);
|
|
|
|
/* Disable pfault pseudo page faults on this cpu. */
|
|
pfault_fini();
|
|
|
|
memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals));
|
|
memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals));
|
|
|
|
/* disable all external interrupts */
|
|
cr_parms.orvals[0] = 0;
|
|
cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 |
|
|
1 << 11 | 1 << 10 | 1 << 6 | 1 << 4);
|
|
/* disable all I/O interrupts */
|
|
cr_parms.orvals[6] = 0;
|
|
cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 |
|
|
1 << 27 | 1 << 26 | 1 << 25 | 1 << 24);
|
|
/* disable most machine checks */
|
|
cr_parms.orvals[14] = 0;
|
|
cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 |
|
|
1 << 25 | 1 << 24);
|
|
|
|
smp_ctl_bit_callback(&cr_parms);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __cpu_die(unsigned int cpu)
|
|
{
|
|
/* Wait until target cpu is down */
|
|
while (!smp_cpu_not_running(cpu))
|
|
cpu_relax();
|
|
printk("Processor %d spun down\n", cpu);
|
|
}
|
|
|
|
void cpu_die(void)
|
|
{
|
|
idle_task_exit();
|
|
signal_processor(smp_processor_id(), sigp_stop);
|
|
BUG();
|
|
for (;;);
|
|
}
|
|
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
/*
|
|
* Cycle through the processors and setup structures.
|
|
*/
|
|
|
|
void __init smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
unsigned long stack;
|
|
unsigned int cpu;
|
|
int i;
|
|
|
|
/* request the 0x1201 emergency signal external interrupt */
|
|
if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)
|
|
panic("Couldn't request external interrupt 0x1201");
|
|
memset(lowcore_ptr, 0, sizeof(lowcore_ptr));
|
|
/*
|
|
* Initialize prefix pages and stacks for all possible cpus
|
|
*/
|
|
print_cpu_info(&S390_lowcore.cpu_data);
|
|
|
|
for_each_possible_cpu(i) {
|
|
lowcore_ptr[i] = (struct _lowcore *)
|
|
__get_free_pages(GFP_KERNEL | GFP_DMA,
|
|
sizeof(void*) == 8 ? 1 : 0);
|
|
stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER);
|
|
if (!lowcore_ptr[i] || !stack)
|
|
panic("smp_boot_cpus failed to allocate memory\n");
|
|
|
|
*(lowcore_ptr[i]) = S390_lowcore;
|
|
lowcore_ptr[i]->async_stack = stack + ASYNC_SIZE;
|
|
stack = __get_free_pages(GFP_KERNEL, 0);
|
|
if (!stack)
|
|
panic("smp_boot_cpus failed to allocate memory\n");
|
|
lowcore_ptr[i]->panic_stack = stack + PAGE_SIZE;
|
|
#ifndef CONFIG_64BIT
|
|
if (MACHINE_HAS_IEEE) {
|
|
lowcore_ptr[i]->extended_save_area_addr =
|
|
(__u32) __get_free_pages(GFP_KERNEL, 0);
|
|
if (!lowcore_ptr[i]->extended_save_area_addr)
|
|
panic("smp_boot_cpus failed to "
|
|
"allocate memory\n");
|
|
}
|
|
#endif
|
|
}
|
|
#ifndef CONFIG_64BIT
|
|
if (MACHINE_HAS_IEEE)
|
|
ctl_set_bit(14, 29); /* enable extended save area */
|
|
#endif
|
|
set_prefix((u32)(unsigned long) lowcore_ptr[smp_processor_id()]);
|
|
|
|
for_each_possible_cpu(cpu)
|
|
if (cpu != smp_processor_id())
|
|
smp_create_idle(cpu);
|
|
}
|
|
|
|
void __init smp_prepare_boot_cpu(void)
|
|
{
|
|
BUG_ON(smp_processor_id() != 0);
|
|
|
|
cpu_set(0, cpu_online_map);
|
|
S390_lowcore.percpu_offset = __per_cpu_offset[0];
|
|
current_set[0] = current;
|
|
}
|
|
|
|
void __init smp_cpus_done(unsigned int max_cpus)
|
|
{
|
|
cpu_present_map = cpu_possible_map;
|
|
}
|
|
|
|
/*
|
|
* the frequency of the profiling timer can be changed
|
|
* by writing a multiplier value into /proc/profile.
|
|
*
|
|
* usually you want to run this on all CPUs ;)
|
|
*/
|
|
int setup_profiling_timer(unsigned int multiplier)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static DEFINE_PER_CPU(struct cpu, cpu_devices);
|
|
|
|
static ssize_t show_capability(struct sys_device *dev, char *buf)
|
|
{
|
|
unsigned int capability;
|
|
int rc;
|
|
|
|
rc = get_cpu_capability(&capability);
|
|
if (rc)
|
|
return rc;
|
|
return sprintf(buf, "%u\n", capability);
|
|
}
|
|
static SYSDEV_ATTR(capability, 0444, show_capability, NULL);
|
|
|
|
static int __cpuinit smp_cpu_notify(struct notifier_block *self,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned int)(long)hcpu;
|
|
struct cpu *c = &per_cpu(cpu_devices, cpu);
|
|
struct sys_device *s = &c->sysdev;
|
|
|
|
switch (action) {
|
|
case CPU_ONLINE:
|
|
case CPU_ONLINE_FROZEN:
|
|
if (sysdev_create_file(s, &attr_capability))
|
|
return NOTIFY_BAD;
|
|
break;
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
sysdev_remove_file(s, &attr_capability);
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block __cpuinitdata smp_cpu_nb = {
|
|
.notifier_call = smp_cpu_notify,
|
|
};
|
|
|
|
static int __init topology_init(void)
|
|
{
|
|
int cpu;
|
|
|
|
register_cpu_notifier(&smp_cpu_nb);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct cpu *c = &per_cpu(cpu_devices, cpu);
|
|
struct sys_device *s = &c->sysdev;
|
|
|
|
c->hotpluggable = 1;
|
|
register_cpu(c, cpu);
|
|
if (!cpu_online(cpu))
|
|
continue;
|
|
s = &c->sysdev;
|
|
sysdev_create_file(s, &attr_capability);
|
|
}
|
|
return 0;
|
|
}
|
|
subsys_initcall(topology_init);
|