diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/kernel/irq.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/kernel/irq.c | 680 |
1 files changed, 0 insertions, 680 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/kernel/irq.c b/ANDROID_3.4.5/arch/powerpc/kernel/irq.c deleted file mode 100644 index d7ebc58c..00000000 --- a/ANDROID_3.4.5/arch/powerpc/kernel/irq.c +++ /dev/null @@ -1,680 +0,0 @@ -/* - * Derived from arch/i386/kernel/irq.c - * Copyright (C) 1992 Linus Torvalds - * Adapted from arch/i386 by Gary Thomas - * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) - * Updated and modified by Cort Dougan <cort@fsmlabs.com> - * Copyright (C) 1996-2001 Cort Dougan - * Adapted for Power Macintosh by Paul Mackerras - * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * This file contains the code used by various IRQ handling routines: - * asking for different IRQ's should be done through these routines - * instead of just grabbing them. Thus setups with different IRQ numbers - * shouldn't result in any weird surprises, and installing new handlers - * should be easier. - * - * The MPC8xx has an interrupt mask in the SIU. If a bit is set, the - * interrupt is _enabled_. As expected, IRQ0 is bit 0 in the 32-bit - * mask register (of which only 16 are defined), hence the weird shifting - * and complement of the cached_irq_mask. I want to be able to stuff - * this right into the SIU SMASK register. - * Many of the prep/chrp functions are conditional compiled on CONFIG_8xx - * to reduce code space and undefined function references. - */ - -#undef DEBUG - -#include <linux/export.h> -#include <linux/threads.h> -#include <linux/kernel_stat.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/ptrace.h> -#include <linux/ioport.h> -#include <linux/interrupt.h> -#include <linux/timex.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/delay.h> -#include <linux/irq.h> -#include <linux/seq_file.h> -#include <linux/cpumask.h> -#include <linux/profile.h> -#include <linux/bitops.h> -#include <linux/list.h> -#include <linux/radix-tree.h> -#include <linux/mutex.h> -#include <linux/bootmem.h> -#include <linux/pci.h> -#include <linux/debugfs.h> -#include <linux/of.h> -#include <linux/of_irq.h> - -#include <asm/uaccess.h> -#include <asm/io.h> -#include <asm/pgtable.h> -#include <asm/irq.h> -#include <asm/cache.h> -#include <asm/prom.h> -#include <asm/ptrace.h> -#include <asm/machdep.h> -#include <asm/udbg.h> -#include <asm/smp.h> -#include <asm/debug.h> - -#ifdef CONFIG_PPC64 -#include <asm/paca.h> -#include <asm/firmware.h> -#include <asm/lv1call.h> -#endif -#define CREATE_TRACE_POINTS -#include <asm/trace.h> - -DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); -EXPORT_PER_CPU_SYMBOL(irq_stat); - -int __irq_offset_value; - -#ifdef CONFIG_PPC32 -EXPORT_SYMBOL(__irq_offset_value); -atomic_t ppc_n_lost_interrupts; - -#ifdef CONFIG_TAU_INT -extern int tau_initialized; -extern int tau_interrupts(int); -#endif -#endif /* CONFIG_PPC32 */ - -#ifdef CONFIG_PPC64 - -int distribute_irqs = 1; - -static inline notrace unsigned long get_irq_happened(void) -{ - unsigned long happened; - - __asm__ __volatile__("lbz %0,%1(13)" - : "=r" (happened) : "i" (offsetof(struct paca_struct, irq_happened))); - - return happened; -} - -static inline notrace void set_soft_enabled(unsigned long enable) -{ - __asm__ __volatile__("stb %0,%1(13)" - : : "r" (enable), "i" (offsetof(struct paca_struct, soft_enabled))); -} - -static inline notrace int decrementer_check_overflow(void) -{ - u64 now = get_tb_or_rtc(); - u64 *next_tb = &__get_cpu_var(decrementers_next_tb); - - if (now >= *next_tb) - set_dec(1); - return now >= *next_tb; -} - -/* This is called whenever we are re-enabling interrupts - * and returns either 0 (nothing to do) or 500/900 if there's - * either an EE or a DEC to generate. - * - * This is called in two contexts: From arch_local_irq_restore() - * before soft-enabling interrupts, and from the exception exit - * path when returning from an interrupt from a soft-disabled to - * a soft enabled context. In both case we have interrupts hard - * disabled. - * - * We take care of only clearing the bits we handled in the - * PACA irq_happened field since we can only re-emit one at a - * time and we don't want to "lose" one. - */ -notrace unsigned int __check_irq_replay(void) -{ - /* - * We use local_paca rather than get_paca() to avoid all - * the debug_smp_processor_id() business in this low level - * function - */ - unsigned char happened = local_paca->irq_happened; - - /* Clear bit 0 which we wouldn't clear otherwise */ - local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; - - /* - * Force the delivery of pending soft-disabled interrupts on PS3. - * Any HV call will have this side effect. - */ - if (firmware_has_feature(FW_FEATURE_PS3_LV1)) { - u64 tmp, tmp2; - lv1_get_version_info(&tmp, &tmp2); - } - - /* - * We may have missed a decrementer interrupt. We check the - * decrementer itself rather than the paca irq_happened field - * in case we also had a rollover while hard disabled - */ - local_paca->irq_happened &= ~PACA_IRQ_DEC; - if (decrementer_check_overflow()) - return 0x900; - - /* Finally check if an external interrupt happened */ - local_paca->irq_happened &= ~PACA_IRQ_EE; - if (happened & PACA_IRQ_EE) - return 0x500; - -#ifdef CONFIG_PPC_BOOK3E - /* Finally check if an EPR external interrupt happened - * this bit is typically set if we need to handle another - * "edge" interrupt from within the MPIC "EPR" handler - */ - local_paca->irq_happened &= ~PACA_IRQ_EE_EDGE; - if (happened & PACA_IRQ_EE_EDGE) - return 0x500; - - local_paca->irq_happened &= ~PACA_IRQ_DBELL; - if (happened & PACA_IRQ_DBELL) - return 0x280; -#endif /* CONFIG_PPC_BOOK3E */ - - /* There should be nothing left ! */ - BUG_ON(local_paca->irq_happened != 0); - - return 0; -} - -notrace void arch_local_irq_restore(unsigned long en) -{ - unsigned char irq_happened; - unsigned int replay; - - /* Write the new soft-enabled value */ - set_soft_enabled(en); - if (!en) - return; - /* - * From this point onward, we can take interrupts, preempt, - * etc... unless we got hard-disabled. We check if an event - * happened. If none happened, we know we can just return. - * - * We may have preempted before the check below, in which case - * we are checking the "new" CPU instead of the old one. This - * is only a problem if an event happened on the "old" CPU. - * - * External interrupt events will have caused interrupts to - * be hard-disabled, so there is no problem, we - * cannot have preempted. - */ - irq_happened = get_irq_happened(); - if (!irq_happened) - return; - - /* - * We need to hard disable to get a trusted value from - * __check_irq_replay(). We also need to soft-disable - * again to avoid warnings in there due to the use of - * per-cpu variables. - * - * We know that if the value in irq_happened is exactly 0x01 - * then we are already hard disabled (there are other less - * common cases that we'll ignore for now), so we skip the - * (expensive) mtmsrd. - */ - if (unlikely(irq_happened != PACA_IRQ_HARD_DIS)) - __hard_irq_disable(); -#ifdef CONFIG_TRACE_IRQFLAGS - else { - /* - * We should already be hard disabled here. We had bugs - * where that wasn't the case so let's dbl check it and - * warn if we are wrong. Only do that when IRQ tracing - * is enabled as mfmsr() can be costly. - */ - if (WARN_ON(mfmsr() & MSR_EE)) - __hard_irq_disable(); - } -#endif /* CONFIG_TRACE_IRQFLAG */ - - set_soft_enabled(0); - - /* - * Check if anything needs to be re-emitted. We haven't - * soft-enabled yet to avoid warnings in decrementer_check_overflow - * accessing per-cpu variables - */ - replay = __check_irq_replay(); - - /* We can soft-enable now */ - set_soft_enabled(1); - - /* - * And replay if we have to. This will return with interrupts - * hard-enabled. - */ - if (replay) { - __replay_interrupt(replay); - return; - } - - /* Finally, let's ensure we are hard enabled */ - __hard_irq_enable(); -} -EXPORT_SYMBOL(arch_local_irq_restore); - -/* - * This is specifically called by assembly code to re-enable interrupts - * if they are currently disabled. This is typically called before - * schedule() or do_signal() when returning to userspace. We do it - * in C to avoid the burden of dealing with lockdep etc... - * - * NOTE: This is called with interrupts hard disabled but not marked - * as such in paca->irq_happened, so we need to resync this. - */ -void notrace restore_interrupts(void) -{ - if (irqs_disabled()) { - local_paca->irq_happened |= PACA_IRQ_HARD_DIS; - local_irq_enable(); - } else - __hard_irq_enable(); -} - -/* - * This is a helper to use when about to go into idle low-power - * when the latter has the side effect of re-enabling interrupts - * (such as calling H_CEDE under pHyp). - * - * You call this function with interrupts soft-disabled (this is - * already the case when ppc_md.power_save is called). The function - * will return whether to enter power save or just return. - * - * In the former case, it will have notified lockdep of interrupts - * being re-enabled and generally sanitized the lazy irq state, - * and in the latter case it will leave with interrupts hard - * disabled and marked as such, so the local_irq_enable() call - * in cpu_idle() will properly re-enable everything. - */ -bool prep_irq_for_idle(void) -{ - /* - * First we need to hard disable to ensure no interrupt - * occurs before we effectively enter the low power state - */ - hard_irq_disable(); - - /* - * If anything happened while we were soft-disabled, - * we return now and do not enter the low power state. - */ - if (lazy_irq_pending()) - return false; - - /* Tell lockdep we are about to re-enable */ - trace_hardirqs_on(); - - /* - * Mark interrupts as soft-enabled and clear the - * PACA_IRQ_HARD_DIS from the pending mask since we - * are about to hard enable as well as a side effect - * of entering the low power state. - */ - local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS; - local_paca->soft_enabled = 1; - - /* Tell the caller to enter the low power state */ - return true; -} - -#endif /* CONFIG_PPC64 */ - -int arch_show_interrupts(struct seq_file *p, int prec) -{ - int j; - -#if defined(CONFIG_PPC32) && defined(CONFIG_TAU_INT) - if (tau_initialized) { - seq_printf(p, "%*s: ", prec, "TAU"); - for_each_online_cpu(j) - seq_printf(p, "%10u ", tau_interrupts(j)); - seq_puts(p, " PowerPC Thermal Assist (cpu temp)\n"); - } -#endif /* CONFIG_PPC32 && CONFIG_TAU_INT */ - - seq_printf(p, "%*s: ", prec, "LOC"); - for_each_online_cpu(j) - seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs); - seq_printf(p, " Local timer interrupts\n"); - - seq_printf(p, "%*s: ", prec, "SPU"); - for_each_online_cpu(j) - seq_printf(p, "%10u ", per_cpu(irq_stat, j).spurious_irqs); - seq_printf(p, " Spurious interrupts\n"); - - seq_printf(p, "%*s: ", prec, "CNT"); - for_each_online_cpu(j) - seq_printf(p, "%10u ", per_cpu(irq_stat, j).pmu_irqs); - seq_printf(p, " Performance monitoring interrupts\n"); - - seq_printf(p, "%*s: ", prec, "MCE"); - for_each_online_cpu(j) - seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions); - seq_printf(p, " Machine check exceptions\n"); - - return 0; -} - -/* - * /proc/stat helpers - */ -u64 arch_irq_stat_cpu(unsigned int cpu) -{ - u64 sum = per_cpu(irq_stat, cpu).timer_irqs; - - sum += per_cpu(irq_stat, cpu).pmu_irqs; - sum += per_cpu(irq_stat, cpu).mce_exceptions; - sum += per_cpu(irq_stat, cpu).spurious_irqs; - - return sum; -} - -#ifdef CONFIG_HOTPLUG_CPU -void migrate_irqs(void) -{ - struct irq_desc *desc; - unsigned int irq; - static int warned; - cpumask_var_t mask; - const struct cpumask *map = cpu_online_mask; - - alloc_cpumask_var(&mask, GFP_KERNEL); - - for_each_irq_desc(irq, desc) { - struct irq_data *data; - struct irq_chip *chip; - - data = irq_desc_get_irq_data(desc); - if (irqd_is_per_cpu(data)) - continue; - - chip = irq_data_get_irq_chip(data); - - cpumask_and(mask, data->affinity, map); - if (cpumask_any(mask) >= nr_cpu_ids) { - printk("Breaking affinity for irq %i\n", irq); - cpumask_copy(mask, map); - } - if (chip->irq_set_affinity) - chip->irq_set_affinity(data, mask, true); - else if (desc->action && !(warned++)) - printk("Cannot set affinity for irq %i\n", irq); - } - - free_cpumask_var(mask); - - local_irq_enable(); - mdelay(1); - local_irq_disable(); -} -#endif - -static inline void handle_one_irq(unsigned int irq) -{ - struct thread_info *curtp, *irqtp; - unsigned long saved_sp_limit; - struct irq_desc *desc; - - desc = irq_to_desc(irq); - if (!desc) - return; - - /* Switch to the irq stack to handle this */ - curtp = current_thread_info(); - irqtp = hardirq_ctx[smp_processor_id()]; - - if (curtp == irqtp) { - /* We're already on the irq stack, just handle it */ - desc->handle_irq(irq, desc); - return; - } - - saved_sp_limit = current->thread.ksp_limit; - - irqtp->task = curtp->task; - irqtp->flags = 0; - - /* Copy the softirq bits in preempt_count so that the - * softirq checks work in the hardirq context. */ - irqtp->preempt_count = (irqtp->preempt_count & ~SOFTIRQ_MASK) | - (curtp->preempt_count & SOFTIRQ_MASK); - - current->thread.ksp_limit = (unsigned long)irqtp + - _ALIGN_UP(sizeof(struct thread_info), 16); - - call_handle_irq(irq, desc, irqtp, desc->handle_irq); - current->thread.ksp_limit = saved_sp_limit; - irqtp->task = NULL; - - /* Set any flag that may have been set on the - * alternate stack - */ - if (irqtp->flags) - set_bits(irqtp->flags, &curtp->flags); -} - -static inline void check_stack_overflow(void) -{ -#ifdef CONFIG_DEBUG_STACKOVERFLOW - long sp; - - sp = __get_SP() & (THREAD_SIZE-1); - - /* check for stack overflow: is there less than 2KB free? */ - if (unlikely(sp < (sizeof(struct thread_info) + 2048))) { - printk("do_IRQ: stack overflow: %ld\n", - sp - sizeof(struct thread_info)); - dump_stack(); - } -#endif -} - -void do_IRQ(struct pt_regs *regs) -{ - struct pt_regs *old_regs = set_irq_regs(regs); - unsigned int irq; - - trace_irq_entry(regs); - - irq_enter(); - - check_stack_overflow(); - - /* - * Query the platform PIC for the interrupt & ack it. - * - * This will typically lower the interrupt line to the CPU - */ - irq = ppc_md.get_irq(); - - /* We can hard enable interrupts now */ - may_hard_irq_enable(); - - /* And finally process it */ - if (irq != NO_IRQ) - handle_one_irq(irq); - else - __get_cpu_var(irq_stat).spurious_irqs++; - - irq_exit(); - set_irq_regs(old_regs); - - trace_irq_exit(regs); -} - -void __init init_IRQ(void) -{ - if (ppc_md.init_IRQ) - ppc_md.init_IRQ(); - - exc_lvl_ctx_init(); - - irq_ctx_init(); -} - -#if defined(CONFIG_BOOKE) || defined(CONFIG_40x) -struct thread_info *critirq_ctx[NR_CPUS] __read_mostly; -struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly; -struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly; - -void exc_lvl_ctx_init(void) -{ - struct thread_info *tp; - int i, cpu_nr; - - for_each_possible_cpu(i) { -#ifdef CONFIG_PPC64 - cpu_nr = i; -#else - cpu_nr = get_hard_smp_processor_id(i); -#endif - memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE); - tp = critirq_ctx[cpu_nr]; - tp->cpu = cpu_nr; - tp->preempt_count = 0; - -#ifdef CONFIG_BOOKE - memset((void *)dbgirq_ctx[cpu_nr], 0, THREAD_SIZE); - tp = dbgirq_ctx[cpu_nr]; - tp->cpu = cpu_nr; - tp->preempt_count = 0; - - memset((void *)mcheckirq_ctx[cpu_nr], 0, THREAD_SIZE); - tp = mcheckirq_ctx[cpu_nr]; - tp->cpu = cpu_nr; - tp->preempt_count = HARDIRQ_OFFSET; -#endif - } -} -#endif - -struct thread_info *softirq_ctx[NR_CPUS] __read_mostly; -struct thread_info *hardirq_ctx[NR_CPUS] __read_mostly; - -void irq_ctx_init(void) -{ - struct thread_info *tp; - int i; - - for_each_possible_cpu(i) { - memset((void *)softirq_ctx[i], 0, THREAD_SIZE); - tp = softirq_ctx[i]; - tp->cpu = i; - tp->preempt_count = 0; - - memset((void *)hardirq_ctx[i], 0, THREAD_SIZE); - tp = hardirq_ctx[i]; - tp->cpu = i; - tp->preempt_count = HARDIRQ_OFFSET; - } -} - -static inline void do_softirq_onstack(void) -{ - struct thread_info *curtp, *irqtp; - unsigned long saved_sp_limit = current->thread.ksp_limit; - - curtp = current_thread_info(); - irqtp = softirq_ctx[smp_processor_id()]; - irqtp->task = curtp->task; - irqtp->flags = 0; - current->thread.ksp_limit = (unsigned long)irqtp + - _ALIGN_UP(sizeof(struct thread_info), 16); - call_do_softirq(irqtp); - current->thread.ksp_limit = saved_sp_limit; - irqtp->task = NULL; - - /* Set any flag that may have been set on the - * alternate stack - */ - if (irqtp->flags) - set_bits(irqtp->flags, &curtp->flags); -} - -void do_softirq(void) -{ - unsigned long flags; - - if (in_interrupt()) - return; - - local_irq_save(flags); - - if (local_softirq_pending()) - do_softirq_onstack(); - - local_irq_restore(flags); -} - -irq_hw_number_t virq_to_hw(unsigned int virq) -{ - struct irq_data *irq_data = irq_get_irq_data(virq); - return WARN_ON(!irq_data) ? 0 : irq_data->hwirq; -} -EXPORT_SYMBOL_GPL(virq_to_hw); - -#ifdef CONFIG_SMP -int irq_choose_cpu(const struct cpumask *mask) -{ - int cpuid; - - if (cpumask_equal(mask, cpu_all_mask)) { - static int irq_rover; - static DEFINE_RAW_SPINLOCK(irq_rover_lock); - unsigned long flags; - - /* Round-robin distribution... */ -do_round_robin: - raw_spin_lock_irqsave(&irq_rover_lock, flags); - - irq_rover = cpumask_next(irq_rover, cpu_online_mask); - if (irq_rover >= nr_cpu_ids) - irq_rover = cpumask_first(cpu_online_mask); - - cpuid = irq_rover; - - raw_spin_unlock_irqrestore(&irq_rover_lock, flags); - } else { - cpuid = cpumask_first_and(mask, cpu_online_mask); - if (cpuid >= nr_cpu_ids) - goto do_round_robin; - } - - return get_hard_smp_processor_id(cpuid); -} -#else -int irq_choose_cpu(const struct cpumask *mask) -{ - return hard_smp_processor_id(); -} -#endif - -int arch_early_irq_init(void) -{ - return 0; -} - -#ifdef CONFIG_PPC64 -static int __init setup_noirqdistrib(char *str) -{ - distribute_irqs = 0; - return 1; -} - -__setup("noirqdistrib", setup_noirqdistrib); -#endif /* CONFIG_PPC64 */ |