diff options
Diffstat (limited to 'arch/blackfin/mach-common/smp.c')
| -rw-r--r-- | arch/blackfin/mach-common/smp.c | 432 |
1 files changed, 0 insertions, 432 deletions
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c deleted file mode 100644 index b32ddab7966c..000000000000 --- a/arch/blackfin/mach-common/smp.c +++ /dev/null @@ -1,432 +0,0 @@ -/* - * IPI management based on arch/arm/kernel/smp.c (Copyright 2002 ARM Limited) - * - * Copyright 2007-2009 Analog Devices Inc. - * Philippe Gerum <rpm@xenomai.org> - * - * Licensed under the GPL-2. - */ - -#include <linux/module.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/sched/mm.h> -#include <linux/sched/task_stack.h> -#include <linux/interrupt.h> -#include <linux/cache.h> -#include <linux/clockchips.h> -#include <linux/profile.h> -#include <linux/errno.h> -#include <linux/mm.h> -#include <linux/cpu.h> -#include <linux/smp.h> -#include <linux/cpumask.h> -#include <linux/seq_file.h> -#include <linux/irq.h> -#include <linux/slab.h> -#include <linux/atomic.h> -#include <asm/cacheflush.h> -#include <asm/irq_handler.h> -#include <asm/mmu_context.h> -#include <asm/pgtable.h> -#include <asm/pgalloc.h> -#include <asm/processor.h> -#include <asm/ptrace.h> -#include <asm/cpu.h> -#include <asm/time.h> -#include <linux/err.h> - -/* - * Anomaly notes: - * 05000120 - we always define corelock as 32-bit integer in L2 - */ -struct corelock_slot corelock __attribute__ ((__section__(".l2.bss"))); - -#ifdef CONFIG_ICACHE_FLUSH_L1 -unsigned long blackfin_iflush_l1_entry[NR_CPUS]; -#endif - -struct blackfin_initial_pda initial_pda_coreb; - -enum ipi_message_type { - BFIN_IPI_NONE, - BFIN_IPI_TIMER, - BFIN_IPI_RESCHEDULE, - BFIN_IPI_CALL_FUNC, - BFIN_IPI_CPU_STOP, -}; - -struct blackfin_flush_data { - unsigned long start; - unsigned long end; -}; - -void *secondary_stack; - -static struct blackfin_flush_data smp_flush_data; - -static DEFINE_SPINLOCK(stop_lock); - -/* A magic number - stress test shows this is safe for common cases */ -#define BFIN_IPI_MSGQ_LEN 5 - -/* Simple FIFO buffer, overflow leads to panic */ -struct ipi_data { - atomic_t count; - atomic_t bits; -}; - -static DEFINE_PER_CPU(struct ipi_data, bfin_ipi); - -static void ipi_cpu_stop(unsigned int cpu) -{ - spin_lock(&stop_lock); - printk(KERN_CRIT "CPU%u: stopping\n", cpu); - dump_stack(); - spin_unlock(&stop_lock); - - set_cpu_online(cpu, false); - - local_irq_disable(); - - while (1) - SSYNC(); -} - -static void ipi_flush_icache(void *info) -{ - struct blackfin_flush_data *fdata = info; - - /* Invalidate the memory holding the bounds of the flushed region. */ - blackfin_dcache_invalidate_range((unsigned long)fdata, - (unsigned long)fdata + sizeof(*fdata)); - - /* Make sure all write buffers in the data side of the core - * are flushed before trying to invalidate the icache. This - * needs to be after the data flush and before the icache - * flush so that the SSYNC does the right thing in preventing - * the instruction prefetcher from hitting things in cached - * memory at the wrong time -- it runs much further ahead than - * the pipeline. - */ - SSYNC(); - - /* ipi_flaush_icache is invoked by generic flush_icache_range, - * so call blackfin arch icache flush directly here. - */ - blackfin_icache_flush_range(fdata->start, fdata->end); -} - -/* Use IRQ_SUPPLE_0 to request reschedule. - * When returning from interrupt to user space, - * there is chance to reschedule */ -static irqreturn_t ipi_handler_int0(int irq, void *dev_instance) -{ - unsigned int cpu = smp_processor_id(); - - platform_clear_ipi(cpu, IRQ_SUPPLE_0); - return IRQ_HANDLED; -} - -DECLARE_PER_CPU(struct clock_event_device, coretmr_events); -void ipi_timer(void) -{ - int cpu = smp_processor_id(); - struct clock_event_device *evt = &per_cpu(coretmr_events, cpu); - evt->event_handler(evt); -} - -static irqreturn_t ipi_handler_int1(int irq, void *dev_instance) -{ - struct ipi_data *bfin_ipi_data; - unsigned int cpu = smp_processor_id(); - unsigned long pending; - unsigned long msg; - - platform_clear_ipi(cpu, IRQ_SUPPLE_1); - - smp_rmb(); - bfin_ipi_data = this_cpu_ptr(&bfin_ipi); - while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) { - msg = 0; - do { - msg = find_next_bit(&pending, BITS_PER_LONG, msg + 1); - switch (msg) { - case BFIN_IPI_TIMER: - ipi_timer(); - break; - case BFIN_IPI_RESCHEDULE: - scheduler_ipi(); - break; - case BFIN_IPI_CALL_FUNC: - generic_smp_call_function_interrupt(); - break; - case BFIN_IPI_CPU_STOP: - ipi_cpu_stop(cpu); - break; - default: - goto out; - } - atomic_dec(&bfin_ipi_data->count); - } while (msg < BITS_PER_LONG); - - } -out: - return IRQ_HANDLED; -} - -static void bfin_ipi_init(void) -{ - unsigned int cpu; - struct ipi_data *bfin_ipi_data; - for_each_possible_cpu(cpu) { - bfin_ipi_data = &per_cpu(bfin_ipi, cpu); - atomic_set(&bfin_ipi_data->bits, 0); - atomic_set(&bfin_ipi_data->count, 0); - } -} - -void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg) -{ - unsigned int cpu; - struct ipi_data *bfin_ipi_data; - unsigned long flags; - - local_irq_save(flags); - for_each_cpu(cpu, cpumask) { - bfin_ipi_data = &per_cpu(bfin_ipi, cpu); - atomic_or((1 << msg), &bfin_ipi_data->bits); - atomic_inc(&bfin_ipi_data->count); - } - local_irq_restore(flags); - smp_wmb(); - for_each_cpu(cpu, cpumask) - platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - send_ipi(cpumask_of(cpu), BFIN_IPI_CALL_FUNC); -} - -void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{ - send_ipi(mask, BFIN_IPI_CALL_FUNC); -} - -void smp_send_reschedule(int cpu) -{ - send_ipi(cpumask_of(cpu), BFIN_IPI_RESCHEDULE); - - return; -} - -void smp_send_msg(const struct cpumask *mask, unsigned long type) -{ - send_ipi(mask, type); -} - -void smp_timer_broadcast(const struct cpumask *mask) -{ - smp_send_msg(mask, BFIN_IPI_TIMER); -} - -void smp_send_stop(void) -{ - cpumask_t callmap; - - preempt_disable(); - cpumask_copy(&callmap, cpu_online_mask); - cpumask_clear_cpu(smp_processor_id(), &callmap); - if (!cpumask_empty(&callmap)) - send_ipi(&callmap, BFIN_IPI_CPU_STOP); - - preempt_enable(); - - return; -} - -int __cpu_up(unsigned int cpu, struct task_struct *idle) -{ - int ret; - - secondary_stack = task_stack_page(idle) + THREAD_SIZE; - - ret = platform_boot_secondary(cpu, idle); - - secondary_stack = NULL; - - return ret; -} - -static void setup_secondary(unsigned int cpu) -{ - unsigned long ilat; - - bfin_write_IMASK(0); - CSYNC(); - ilat = bfin_read_ILAT(); - CSYNC(); - bfin_write_ILAT(ilat); - CSYNC(); - - /* Enable interrupt levels IVG7-15. IARs have been already - * programmed by the boot CPU. */ - bfin_irq_flags |= IMASK_IVG15 | - IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 | - IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW; -} - -void secondary_start_kernel(void) -{ - unsigned int cpu = smp_processor_id(); - struct mm_struct *mm = &init_mm; - - if (_bfin_swrst & SWRST_DBL_FAULT_B) { - printk(KERN_EMERG "CoreB Recovering from DOUBLE FAULT event\n"); -#ifdef CONFIG_DEBUG_DOUBLEFAULT - printk(KERN_EMERG " While handling exception (EXCAUSE = %#x) at %pF\n", - initial_pda_coreb.seqstat_doublefault & SEQSTAT_EXCAUSE, - initial_pda_coreb.retx_doublefault); - printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n", - initial_pda_coreb.dcplb_doublefault_addr); - printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n", - initial_pda_coreb.icplb_doublefault_addr); -#endif - printk(KERN_NOTICE " The instruction at %pF caused a double exception\n", - initial_pda_coreb.retx); - } - - /* - * We want the D-cache to be enabled early, in case the atomic - * support code emulates cache coherence (see - * __ARCH_SYNC_CORE_DCACHE). - */ - init_exception_vectors(); - - local_irq_disable(); - - /* Attach the new idle task to the global mm. */ - mmget(mm); - mmgrab(mm); - current->active_mm = mm; - - preempt_disable(); - - setup_secondary(cpu); - - platform_secondary_init(cpu); - /* setup local core timer */ - bfin_local_timer_setup(); - - local_irq_enable(); - - bfin_setup_caches(cpu); - - notify_cpu_starting(cpu); - /* - * Calibrate loops per jiffy value. - * IRQs need to be enabled here - D-cache can be invalidated - * in timer irq handler, so core B can read correct jiffies. - */ - calibrate_delay(); - - /* We are done with local CPU inits, unblock the boot CPU. */ - set_cpu_online(cpu, true); - cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); -} - -void __init smp_prepare_boot_cpu(void) -{ -} - -void __init smp_prepare_cpus(unsigned int max_cpus) -{ - platform_prepare_cpus(max_cpus); - bfin_ipi_init(); - platform_request_ipi(IRQ_SUPPLE_0, ipi_handler_int0); - platform_request_ipi(IRQ_SUPPLE_1, ipi_handler_int1); -} - -void __init smp_cpus_done(unsigned int max_cpus) -{ - unsigned long bogosum = 0; - unsigned int cpu; - - for_each_online_cpu(cpu) - bogosum += loops_per_jiffy; - - printk(KERN_INFO "SMP: Total of %d processors activated " - "(%lu.%02lu BogoMIPS).\n", - num_online_cpus(), - bogosum / (500000/HZ), - (bogosum / (5000/HZ)) % 100); -} - -void smp_icache_flush_range_others(unsigned long start, unsigned long end) -{ - smp_flush_data.start = start; - smp_flush_data.end = end; - - preempt_disable(); - if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 1)) - printk(KERN_WARNING "SMP: failed to run I-cache flush request on other CPUs\n"); - preempt_enable(); -} -EXPORT_SYMBOL_GPL(smp_icache_flush_range_others); - -#ifdef __ARCH_SYNC_CORE_ICACHE -unsigned long icache_invld_count[NR_CPUS]; -void resync_core_icache(void) -{ - unsigned int cpu = get_cpu(); - blackfin_invalidate_entire_icache(); - icache_invld_count[cpu]++; - put_cpu(); -} -EXPORT_SYMBOL(resync_core_icache); -#endif - -#ifdef __ARCH_SYNC_CORE_DCACHE -unsigned long dcache_invld_count[NR_CPUS]; -unsigned long barrier_mask __attribute__ ((__section__(".l2.bss"))); - -void resync_core_dcache(void) -{ - unsigned int cpu = get_cpu(); - blackfin_invalidate_entire_dcache(); - dcache_invld_count[cpu]++; - put_cpu(); -} -EXPORT_SYMBOL(resync_core_dcache); -#endif - -#ifdef CONFIG_HOTPLUG_CPU -int __cpu_disable(void) -{ - unsigned int cpu = smp_processor_id(); - - if (cpu == 0) - return -EPERM; - - set_cpu_online(cpu, false); - return 0; -} - -int __cpu_die(unsigned int cpu) -{ - return cpu_wait_death(cpu, 5); -} - -void cpu_die(void) -{ - (void)cpu_report_death(); - - atomic_dec(&init_mm.mm_users); - atomic_dec(&init_mm.mm_count); - - local_irq_disable(); - platform_cpu_die(); -} -#endif |