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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * 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 ([email protected])
- * Updated and modified by Cort Dougan <[email protected]>
- * Copyright (C) 1996-2001 Cort Dougan
- * Adapted for Power Macintosh by Paul Mackerras
- * Copyright (C) 1996 Paul Mackerras ([email protected])
- *
- * 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_PPC_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/pci.h>
- #include <linux/debugfs.h>
- #include <linux/of.h>
- #include <linux/of_irq.h>
- #include <linux/vmalloc.h>
- #include <linux/pgtable.h>
- #include <linux/static_call.h>
- #include <linux/uaccess.h>
- #include <asm/interrupt.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/cache.h>
- #include <asm/ptrace.h>
- #include <asm/machdep.h>
- #include <asm/udbg.h>
- #include <asm/smp.h>
- #include <asm/hw_irq.h>
- #include <asm/softirq_stack.h>
- #include <asm/ppc_asm.h>
- #define CREATE_TRACE_POINTS
- #include <asm/trace.h>
- #include <asm/cpu_has_feature.h>
- DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
- EXPORT_PER_CPU_SYMBOL(irq_stat);
- #ifdef CONFIG_PPC32
- atomic_t ppc_n_lost_interrupts;
- #ifdef CONFIG_TAU_INT
- extern int tau_initialized;
- u32 tau_interrupts(unsigned long cpu);
- #endif
- #endif /* CONFIG_PPC32 */
- 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_event);
- seq_printf(p, " Local timer interrupts for timer event device\n");
- seq_printf(p, "%*s: ", prec, "BCT");
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", per_cpu(irq_stat, j).broadcast_irqs_event);
- seq_printf(p, " Broadcast timer interrupts for timer event device\n");
- seq_printf(p, "%*s: ", prec, "LOC");
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", per_cpu(irq_stat, j).timer_irqs_others);
- seq_printf(p, " Local timer interrupts for others\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, "PMI");
- 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");
- #ifdef CONFIG_PPC_BOOK3S_64
- if (cpu_has_feature(CPU_FTR_HVMODE)) {
- seq_printf(p, "%*s: ", prec, "HMI");
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", paca_ptrs[j]->hmi_irqs);
- seq_printf(p, " Hypervisor Maintenance Interrupts\n");
- }
- #endif
- seq_printf(p, "%*s: ", prec, "NMI");
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", per_cpu(irq_stat, j).sreset_irqs);
- seq_printf(p, " System Reset interrupts\n");
- #ifdef CONFIG_PPC_WATCHDOG
- seq_printf(p, "%*s: ", prec, "WDG");
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", per_cpu(irq_stat, j).soft_nmi_irqs);
- seq_printf(p, " Watchdog soft-NMI interrupts\n");
- #endif
- #ifdef CONFIG_PPC_DOORBELL
- if (cpu_has_feature(CPU_FTR_DBELL)) {
- seq_printf(p, "%*s: ", prec, "DBL");
- for_each_online_cpu(j)
- seq_printf(p, "%10u ", per_cpu(irq_stat, j).doorbell_irqs);
- seq_printf(p, " Doorbell interrupts\n");
- }
- #endif
- return 0;
- }
- /*
- * /proc/stat helpers
- */
- u64 arch_irq_stat_cpu(unsigned int cpu)
- {
- u64 sum = per_cpu(irq_stat, cpu).timer_irqs_event;
- sum += per_cpu(irq_stat, cpu).broadcast_irqs_event;
- sum += per_cpu(irq_stat, cpu).pmu_irqs;
- sum += per_cpu(irq_stat, cpu).mce_exceptions;
- sum += per_cpu(irq_stat, cpu).spurious_irqs;
- sum += per_cpu(irq_stat, cpu).timer_irqs_others;
- #ifdef CONFIG_PPC_BOOK3S_64
- sum += paca_ptrs[cpu]->hmi_irqs;
- #endif
- sum += per_cpu(irq_stat, cpu).sreset_irqs;
- #ifdef CONFIG_PPC_WATCHDOG
- sum += per_cpu(irq_stat, cpu).soft_nmi_irqs;
- #endif
- #ifdef CONFIG_PPC_DOORBELL
- sum += per_cpu(irq_stat, cpu).doorbell_irqs;
- #endif
- return sum;
- }
- static inline void check_stack_overflow(unsigned long sp)
- {
- if (!IS_ENABLED(CONFIG_DEBUG_STACKOVERFLOW))
- return;
- sp &= THREAD_SIZE - 1;
- /* check for stack overflow: is there less than 1/4th free? */
- if (unlikely(sp < THREAD_SIZE / 4)) {
- pr_err("do_IRQ: stack overflow: %ld\n", sp);
- dump_stack();
- }
- }
- #ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
- static __always_inline void call_do_softirq(const void *sp)
- {
- /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */
- asm volatile (
- PPC_STLU " %%r1, %[offset](%[sp]) ;"
- "mr %%r1, %[sp] ;"
- "bl %[callee] ;"
- PPC_LL " %%r1, 0(%%r1) ;"
- : // Outputs
- : // Inputs
- [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD),
- [callee] "i" (__do_softirq)
- : // Clobbers
- "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
- "cr7", "r0", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
- "r11", "r12"
- );
- }
- #endif
- DEFINE_STATIC_CALL_RET0(ppc_get_irq, *ppc_md.get_irq);
- static void __do_irq(struct pt_regs *regs, unsigned long oldsp)
- {
- unsigned int irq;
- trace_irq_entry(regs);
- check_stack_overflow(oldsp);
- /*
- * Query the platform PIC for the interrupt & ack it.
- *
- * This will typically lower the interrupt line to the CPU
- */
- irq = static_call(ppc_get_irq)();
- /* We can hard enable interrupts now to allow perf interrupts */
- if (should_hard_irq_enable(regs))
- do_hard_irq_enable();
- /* And finally process it */
- if (unlikely(!irq))
- __this_cpu_inc(irq_stat.spurious_irqs);
- else
- generic_handle_irq(irq);
- trace_irq_exit(regs);
- }
- static __always_inline void call_do_irq(struct pt_regs *regs, void *sp)
- {
- register unsigned long r3 asm("r3") = (unsigned long)regs;
- /* Temporarily switch r1 to sp, call __do_irq() then restore r1. */
- asm volatile (
- PPC_STLU " %%r1, %[offset](%[sp]) ;"
- "mr %%r4, %%r1 ;"
- "mr %%r1, %[sp] ;"
- "bl %[callee] ;"
- PPC_LL " %%r1, 0(%%r1) ;"
- : // Outputs
- "+r" (r3)
- : // Inputs
- [sp] "b" (sp), [offset] "i" (THREAD_SIZE - STACK_FRAME_OVERHEAD),
- [callee] "i" (__do_irq)
- : // Clobbers
- "lr", "xer", "ctr", "memory", "cr0", "cr1", "cr5", "cr6",
- "cr7", "r0", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
- "r11", "r12"
- );
- }
- void __do_IRQ(struct pt_regs *regs)
- {
- struct pt_regs *old_regs = set_irq_regs(regs);
- void *cursp, *irqsp, *sirqsp;
- /* Switch to the irq stack to handle this */
- cursp = (void *)(current_stack_pointer & ~(THREAD_SIZE - 1));
- irqsp = hardirq_ctx[raw_smp_processor_id()];
- sirqsp = softirq_ctx[raw_smp_processor_id()];
- /* Already there ? If not switch stack and call */
- if (unlikely(cursp == irqsp || cursp == sirqsp))
- __do_irq(regs, current_stack_pointer);
- else
- call_do_irq(regs, irqsp);
- set_irq_regs(old_regs);
- }
- DEFINE_INTERRUPT_HANDLER_ASYNC(do_IRQ)
- {
- __do_IRQ(regs);
- }
- static void *__init alloc_vm_stack(void)
- {
- return __vmalloc_node(THREAD_SIZE, THREAD_ALIGN, THREADINFO_GFP,
- NUMA_NO_NODE, (void *)_RET_IP_);
- }
- static void __init vmap_irqstack_init(void)
- {
- int i;
- for_each_possible_cpu(i) {
- softirq_ctx[i] = alloc_vm_stack();
- hardirq_ctx[i] = alloc_vm_stack();
- }
- }
- void __init init_IRQ(void)
- {
- if (IS_ENABLED(CONFIG_VMAP_STACK))
- vmap_irqstack_init();
- if (ppc_md.init_IRQ)
- ppc_md.init_IRQ();
- if (!WARN_ON(!ppc_md.get_irq))
- static_call_update(ppc_get_irq, ppc_md.get_irq);
- }
- #ifdef CONFIG_BOOKE_OR_40x
- void *critirq_ctx[NR_CPUS] __read_mostly;
- void *dbgirq_ctx[NR_CPUS] __read_mostly;
- void *mcheckirq_ctx[NR_CPUS] __read_mostly;
- #endif
- void *softirq_ctx[NR_CPUS] __read_mostly;
- void *hardirq_ctx[NR_CPUS] __read_mostly;
- #ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
- void do_softirq_own_stack(void)
- {
- call_do_softirq(softirq_ctx[smp_processor_id()]);
- }
- #endif
- 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_online_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
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