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arm64: Support arch_irq_work_raise() via self IPIs
Support for arch_irq_work_raise() was missing from arm64 (a prerequisite for FULL_NOHZ). This patch is based on the arm32 patch ARM 7872/1. commit bf18525fd793101df42a1344ecc48b49b62e48c9 Author: Stephen Boyd <sboyd@codeaurora.org> Date: Tue Oct 29 20:32:56 2013 +0100 ARM: 7872/1: Support arch_irq_work_raise() via self IPIs By default, IRQ work is run from the tick interrupt (see irq_work_run() in update_process_times()). When we're in full NOHZ mode, restarting the tick requires the use of IRQ work and if the only place we run IRQ work is in the tick interrupt we have an unbreakable cycle. Implement arch_irq_work_raise() via self IPIs to break this cycle and get the tick started again. Note that we implement this via IPIs which are only available on SMP builds. This shouldn't be a problem because full NOHZ is only supported on SMP builds anyway. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Reviewed-by: Kevin Hilman <khilman@linaro.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Larry Bassel <larry.bassel@linaro.org> Reviewed-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Git-commit: eb631bb5bf5b042202aaaee4a8dd8f863ba2a900 [joonwoop@codeaurora.org: moved IPI_WAKUP introduced by '57fa8baf72: arm64: smp: move the pen to a header file' to end of index] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
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@ -20,7 +20,7 @@
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#include <linux/threads.h>
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#include <asm/irq.h>
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#define NR_IPI 7
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#define NR_IPI 8
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typedef struct {
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unsigned int __softirq_pending;
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@ -35,6 +35,7 @@
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#include <linux/clockchips.h>
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#include <linux/completion.h>
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#include <linux/of.h>
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#include <linux/irq_work.h>
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#include <asm/atomic.h>
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#include <asm/cacheflush.h>
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@ -63,6 +64,7 @@ enum ipi_msg_type {
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IPI_CALL_FUNC_SINGLE,
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IPI_CPU_STOP,
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IPI_TIMER,
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IPI_IRQ_WORK,
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IPI_WAKEUP,
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IPI_CPU_BACKTRACE,
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};
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@ -493,6 +495,14 @@ void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
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smp_cross_call(mask, IPI_WAKEUP);
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}
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#ifdef CONFIG_IRQ_WORK
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void arch_irq_work_raise(void)
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{
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if (smp_cross_call)
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smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
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}
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#endif
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static const char *ipi_types[NR_IPI] = {
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#define S(x,s) [x - IPI_RESCHEDULE] = s
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S(IPI_RESCHEDULE, "Rescheduling interrupts"),
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@ -500,6 +510,7 @@ static const char *ipi_types[NR_IPI] = {
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S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
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S(IPI_CPU_STOP, "CPU stop interrupts"),
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S(IPI_TIMER, "Timer broadcast interrupts"),
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S(IPI_IRQ_WORK, "IRQ work interrupts"),
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S(IPI_WAKEUP, "CPU wakeup interrupts"),
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S(IPI_CPU_BACKTRACE, "CPU backtrace"),
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};
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@ -671,6 +682,14 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
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ipi_cpu_backtrace(cpu, regs);
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break;
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#ifdef CONFIG_IRQ_WORK
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case IPI_IRQ_WORK:
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irq_enter();
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irq_work_run();
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irq_exit();
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break;
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#endif
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default:
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pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr);
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break;
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