powerpc/irq: Split irq.c (7d7b28b3) · Commits · EulixOS / Software / Kernel

arch/powerpc/kernel/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -63,7 +63,7 @@ obj-y := cputable.o syscalls.o \
		hw_breakpoint_constraints.o interrupt.o \
		kdebugfs.o stacktrace.o
		obj-y += ptrace/
		obj-$(CONFIG_PPC64) += setup_64.o \
		obj-$(CONFIG_PPC64) += setup_64.o irq_64.o\
		paca.o nvram_64.o note.o
		obj-$(CONFIG_COMPAT) += sys_ppc32.o signal_32.o
		obj-$(CONFIG_VDSO32) += vdso32_wrapper.o

arch/powerpc/kernel/irq.c

+0 −421

Original line number	Diff line number	Diff line
		@@ -67,12 +67,6 @@
		#include <asm/softirq_stack.h>
		#include <asm/ppc_asm.h>

		#ifdef CONFIG_PPC64
		#include <asm/paca.h>
		#include <asm/firmware.h>
		#include <asm/lv1call.h>
		#include <asm/dbell.h>
		#endif
		#define CREATE_TRACE_POINTS
		#include <asm/trace.h>
		#include <asm/cpu_has_feature.h>
		@@ -89,411 +83,6 @@ u32 tau_interrupts(unsigned long cpu);
		#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;
		}

		void replay_soft_interrupts(void)
		{
		struct pt_regs regs;

		/*
		* Be careful here, calling these interrupt handlers can cause
		* softirqs to be raised, which they may run when calling irq_exit,
		* which will cause local_irq_enable() to be run, which can then
		* recurse into this function. Don't keep any state across
		* interrupt handler calls which may change underneath us.
		*
		* We use local_paca rather than get_paca() to avoid all the
		* debug_smp_processor_id() business in this low level function.
		*/

		ppc_save_regs(&regs);
		regs.softe = IRQS_ENABLED;
		regs.msr \|= MSR_EE;

		again:
		if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
		WARN_ON_ONCE(mfmsr() & MSR_EE);

		/*
		* 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);
		}

		/*
		* Check if an hypervisor Maintenance interrupt happened.
		* This is a higher priority interrupt than the others, so
		* replay it first.
		*/
		if (IS_ENABLED(CONFIG_PPC_BOOK3S) && (local_paca->irq_happened & PACA_IRQ_HMI)) {
		local_paca->irq_happened &= ~PACA_IRQ_HMI;
		regs.trap = INTERRUPT_HMI;
		handle_hmi_exception(&regs);
		if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS))
		hard_irq_disable();
		}

		if (local_paca->irq_happened & PACA_IRQ_DEC) {
		local_paca->irq_happened &= ~PACA_IRQ_DEC;
		regs.trap = INTERRUPT_DECREMENTER;
		timer_interrupt(&regs);
		if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS))
		hard_irq_disable();
		}

		if (local_paca->irq_happened & PACA_IRQ_EE) {
		local_paca->irq_happened &= ~PACA_IRQ_EE;
		regs.trap = INTERRUPT_EXTERNAL;
		do_IRQ(&regs);
		if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS))
		hard_irq_disable();
		}

		if (IS_ENABLED(CONFIG_PPC_DOORBELL) && (local_paca->irq_happened & PACA_IRQ_DBELL)) {
		local_paca->irq_happened &= ~PACA_IRQ_DBELL;
		regs.trap = INTERRUPT_DOORBELL;
		doorbell_exception(&regs);
		if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS))
		hard_irq_disable();
		}

		/* Book3E does not support soft-masking PMI interrupts */
		if (IS_ENABLED(CONFIG_PPC_BOOK3S) && (local_paca->irq_happened & PACA_IRQ_PMI)) {
		local_paca->irq_happened &= ~PACA_IRQ_PMI;
		regs.trap = INTERRUPT_PERFMON;
		performance_monitor_exception(&regs);
		if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS))
		hard_irq_disable();
		}

		if (local_paca->irq_happened & ~PACA_IRQ_HARD_DIS) {
		/*
		* We are responding to the next interrupt, so interrupt-off
		* latencies should be reset here.
		*/
		trace_hardirqs_on();
		trace_hardirqs_off();
		goto again;
		}
		}

		#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_PPC_KUAP)
		static inline void replay_soft_interrupts_irqrestore(void)
		{
		unsigned long kuap_state = get_kuap();

		/*
		* Check if anything calls local_irq_enable/restore() when KUAP is
		* disabled (user access enabled). We handle that case here by saving
		* and re-locking AMR but we shouldn't get here in the first place,
		* hence the warning.
		*/
		kuap_assert_locked();

		if (kuap_state != AMR_KUAP_BLOCKED)
		set_kuap(AMR_KUAP_BLOCKED);

		replay_soft_interrupts();

		if (kuap_state != AMR_KUAP_BLOCKED)
		set_kuap(kuap_state);
		}
		#else
		#define replay_soft_interrupts_irqrestore() replay_soft_interrupts()
		#endif

		notrace void arch_local_irq_restore(unsigned long mask)
		{
		unsigned char irq_happened;

		/* Write the new soft-enabled value if it is a disable */
		if (mask) {
		irq_soft_mask_set(mask);
		return;
		}

		if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
		WARN_ON_ONCE(in_nmi() \|\| in_hardirq());

		/*
		* After the stb, interrupts are unmasked and there are no interrupts
		* pending replay. The restart sequence makes this atomic with
		* respect to soft-masked interrupts. If this was just a simple code
		* sequence, a soft-masked interrupt could become pending right after
		* the comparison and before the stb.
		*
		* This allows interrupts to be unmasked without hard disabling, and
		* also without new hard interrupts coming in ahead of pending ones.
		*/
		asm_volatile_goto(
		"1: \n"
		" lbz 9,%0(13) \n"
		" cmpwi 9,0 \n"
		" bne %l[happened] \n"
		" stb 9,%1(13) \n"
		"2: \n"
		RESTART_TABLE(1b, 2b, 1b)
		: : "i" (offsetof(struct paca_struct, irq_happened)),
		"i" (offsetof(struct paca_struct, irq_soft_mask))
		: "cr0", "r9"
		: happened);

		if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
		WARN_ON_ONCE(!(mfmsr() & MSR_EE));

		return;

		happened:
		irq_happened = get_irq_happened();
		if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
		WARN_ON_ONCE(!irq_happened);

		if (irq_happened == PACA_IRQ_HARD_DIS) {
		if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
		WARN_ON_ONCE(mfmsr() & MSR_EE);
		irq_soft_mask_set(IRQS_ENABLED);
		local_paca->irq_happened = 0;
		__hard_irq_enable();
		return;
		}

		/* Have interrupts to replay, need to hard disable first */
		if (!(irq_happened & PACA_IRQ_HARD_DIS)) {
		if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) {
		if (!(mfmsr() & MSR_EE)) {
		/*
		* An interrupt could have come in and cleared
		* MSR[EE] and set IRQ_HARD_DIS, so check
		* IRQ_HARD_DIS again and warn if it is still
		* clear.
		*/
		irq_happened = get_irq_happened();
		WARN_ON_ONCE(!(irq_happened & PACA_IRQ_HARD_DIS));
		}
		}
		__hard_irq_disable();
		local_paca->irq_happened \|= PACA_IRQ_HARD_DIS;
		} else {
		if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) {
		if (WARN_ON_ONCE(mfmsr() & MSR_EE))
		__hard_irq_disable();
		}
		}

		/*
		* Disable preempt here, so that the below preempt_enable will
		* perform resched if required (a replayed interrupt may set
		* need_resched).
		*/
		preempt_disable();
		irq_soft_mask_set(IRQS_ALL_DISABLED);
		trace_hardirqs_off();

		replay_soft_interrupts_irqrestore();
		local_paca->irq_happened = 0;

		trace_hardirqs_on();
		irq_soft_mask_set(IRQS_ENABLED);
		__hard_irq_enable();
		preempt_enable();
		}
		EXPORT_SYMBOL(arch_local_irq_restore);

		/*
		* 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 arch_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();
		local_paca->irq_happened \|= PACA_IRQ_HARD_DIS;

		/*
		* 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;
		irq_soft_mask_set(IRQS_ENABLED);

		/* Tell the caller to enter the low power state */
		return true;
		}

		#ifdef CONFIG_PPC_BOOK3S
		/*
		* This is for idle sequences that return with IRQs off, but the
		* idle state itself wakes on interrupt. Tell the irq tracer that
		* IRQs are enabled for the duration of idle so it does not get long
		* off times. Must be paired with fini_irq_for_idle_irqsoff.
		*/
		bool prep_irq_for_idle_irqsoff(void)
		{
		WARN_ON(!irqs_disabled());

		/*
		* First we need to hard disable to ensure no interrupt
		* occurs before we effectively enter the low power state
		*/
		__hard_irq_disable();
		local_paca->irq_happened \|= PACA_IRQ_HARD_DIS;

		/*
		* 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();

		return true;
		}

		/*
		* Take the SRR1 wakeup reason, index into this table to find the
		* appropriate irq_happened bit.
		*
		* Sytem reset exceptions taken in idle state also come through here,
		* but they are NMI interrupts so do not need to wait for IRQs to be
		* restored, and should be taken as early as practical. These are marked
		* with 0xff in the table. The Power ISA specifies 0100b as the system
		* reset interrupt reason.
		*/
		#define IRQ_SYSTEM_RESET 0xff

		static const u8 srr1_to_lazyirq[0x10] = {
		0, 0, 0,
		PACA_IRQ_DBELL,
		IRQ_SYSTEM_RESET,
		PACA_IRQ_DBELL,
		PACA_IRQ_DEC,
		0,
		PACA_IRQ_EE,
		PACA_IRQ_EE,
		PACA_IRQ_HMI,
		0, 0, 0, 0, 0 };

		void replay_system_reset(void)
		{
		struct pt_regs regs;

		ppc_save_regs(&regs);
		regs.trap = 0x100;
		get_paca()->in_nmi = 1;
		system_reset_exception(&regs);
		get_paca()->in_nmi = 0;
		}
		EXPORT_SYMBOL_GPL(replay_system_reset);

		void irq_set_pending_from_srr1(unsigned long srr1)
		{
		unsigned int idx = (srr1 & SRR1_WAKEMASK_P8) >> 18;
		u8 reason = srr1_to_lazyirq[idx];

		/*
		* Take the system reset now, which is immediately after registers
		* are restored from idle. It's an NMI, so interrupts need not be
		* re-enabled before it is taken.
		*/
		if (unlikely(reason == IRQ_SYSTEM_RESET)) {
		replay_system_reset();
		return;
		}

		if (reason == PACA_IRQ_DBELL) {
		/*
		* When doorbell triggers a system reset wakeup, the message
		* is not cleared, so if the doorbell interrupt is replayed
		* and the IPI handled, the doorbell interrupt would still
		* fire when EE is enabled.
		*
		* To avoid taking the superfluous doorbell interrupt,
		* execute a msgclr here before the interrupt is replayed.
		*/
		ppc_msgclr(PPC_DBELL_MSGTYPE);
		}

		/*
		* The 0 index (SRR1[42:45]=b0000) must always evaluate to 0,
		* so this can be called unconditionally with the SRR1 wake
		* reason as returned by the idle code, which uses 0 to mean no
		* interrupt.
		*
		* If a future CPU was to designate this as an interrupt reason,
		* then a new index for no interrupt must be assigned.
		*/
		local_paca->irq_happened \|= reason;
		}
		#endif /* CONFIG_PPC_BOOK3S */

		/*
		* Force a replay of the external interrupt handler on this CPU.
		*/
		void force_external_irq_replay(void)
		{
		/*
		* This must only be called with interrupts soft-disabled,
		* the replay will happen when re-enabling.
		*/
		WARN_ON(!arch_irqs_disabled());

		/*
		* Interrupts must always be hard disabled before irq_happened is
		* modified (to prevent lost update in case of interrupt between
		* load and store).
		*/
		__hard_irq_disable();
		local_paca->irq_happened \|= PACA_IRQ_HARD_DIS;

		/* Indicate in the PACA that we have an interrupt to replay */
		local_paca->irq_happened \|= PACA_IRQ_EE;
		}

		#endif /* CONFIG_PPC64 */

		int arch_show_interrupts(struct seq_file *p, int prec)
		{
		int j;
		@@ -795,13 +384,3 @@ int irq_choose_cpu(const struct cpumask *mask)
		return hard_smp_processor_id();
		}
		#endif

		#ifdef CONFIG_PPC64
		static int __init setup_noirqdistrib(char *str)
		{
		distribute_irqs = 0;
		return 1;
		}

		__setup("noirqdistrib", setup_noirqdistrib);
		#endif /* CONFIG_PPC64 */

arch/powerpc/kernel/irq_64.c

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