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author | Stephen Boyd <sboyd@codeaurora.org> | 2014-09-11 22:25:30 (GMT) |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-09-16 15:09:33 (GMT) |
commit | 505013bc9065391f09a51d51cd3bf0b06dfb570a (patch) | |
tree | 8f3434796acf5dc39e1c982d2d817993c7ee4f22 /arch | |
parent | fbfb872f5f417cea48760c535e0ff027c88b507a (diff) | |
download | linux-505013bc9065391f09a51d51cd3bf0b06dfb570a.tar.xz |
ARM: 8149/1: perf: Don't sleep while atomic when enabling per-cpu interrupts
Rob Clark reports a sleeping while atomic bug when using perf.
BUG: sleeping function called from invalid context at ../kernel/locking/mutex.c:583
in_atomic(): 1, irqs_disabled(): 128, pid: 0, name: swapper/0
------------[ cut here ]------------
WARNING: CPU: 2 PID: 4828 at ../kernel/locking/mutex.c:479 mutex_lock_nested+0x3a0/0x3e8()
DEBUG_LOCKS_WARN_ON(in_interrupt())
Modules linked in:
CPU: 2 PID: 4828 Comm: Xorg.bin Tainted: G W 3.17.0-rc3-00234-gd535c45-dirty #819
[<c0216690>] (unwind_backtrace) from [<c0212174>] (show_stack+0x10/0x14)
[<c0212174>] (show_stack) from [<c0867cc0>] (dump_stack+0x98/0xb8)
[<c0867cc0>] (dump_stack) from [<c02492a4>] (warn_slowpath_common+0x70/0x8c)
[<c02492a4>] (warn_slowpath_common) from [<c02492f0>] (warn_slowpath_fmt+0x30/0x40)
[<c02492f0>] (warn_slowpath_fmt) from [<c086a3f8>] (mutex_lock_nested+0x3a0/0x3e8)
[<c086a3f8>] (mutex_lock_nested) from [<c0294d08>] (irq_find_host+0x20/0x9c)
[<c0294d08>] (irq_find_host) from [<c0769d50>] (of_irq_get+0x28/0x48)
[<c0769d50>] (of_irq_get) from [<c057d104>] (platform_get_irq+0x1c/0x8c)
[<c057d104>] (platform_get_irq) from [<c021a06c>] (cpu_pmu_enable_percpu_irq+0x14/0x38)
[<c021a06c>] (cpu_pmu_enable_percpu_irq) from [<c02b1634>] (flush_smp_call_function_queue+0x88/0x178)
[<c02b1634>] (flush_smp_call_function_queue) from [<c0214dc0>] (handle_IPI+0x88/0x160)
[<c0214dc0>] (handle_IPI) from [<c0208930>] (gic_handle_irq+0x64/0x68)
[<c0208930>] (gic_handle_irq) from [<c0212d04>] (__irq_svc+0x44/0x5c)
Exception stack(0xe63ddea0 to 0xe63ddee8)
dea0: 00000001 00000001 00000000 c2f3b200 c16db380 c032d4a0 e63ddf40 60010013
dec0: 00000000 001fbfd4 00000100 00000000 00000001 e63ddee8 c0284770 c02a2e30
dee0: 20010013 ffffffff
[<c0212d04>] (__irq_svc) from [<c02a2e30>] (ktime_get_ts64+0x1c8/0x200)
[<c02a2e30>] (ktime_get_ts64) from [<c032d4a0>] (poll_select_set_timeout+0x60/0xa8)
[<c032d4a0>] (poll_select_set_timeout) from [<c032df64>] (SyS_select+0xa8/0x118)
[<c032df64>] (SyS_select) from [<c020e8e0>] (ret_fast_syscall+0x0/0x48)
---[ end trace 0bb583b46342da6f ]---
INFO: lockdep is turned off.
We don't really need to get the platform irq again when we're
enabling or disabling the per-cpu irq. Furthermore, we don't
really need to set and clear bits in the active_irqs bitmask
because that's only used in the non-percpu irq case to figure out
when the last CPU PMU has been disabled. Just pass the irq
directly to the enable/disable functions to clean all this up.
This should be slightly more efficient and also fix the
scheduling while atomic bug.
Fixes: bbd64559376f "ARM: perf: support percpu irqs for the CPU PMU"
Reported-by: Rob Clark <robdclark@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/kernel/perf_event_cpu.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c index e6a6edb..4bf4cce 100644 --- a/arch/arm/kernel/perf_event_cpu.c +++ b/arch/arm/kernel/perf_event_cpu.c @@ -76,21 +76,15 @@ static struct pmu_hw_events *cpu_pmu_get_cpu_events(void) static void cpu_pmu_enable_percpu_irq(void *data) { - struct arm_pmu *cpu_pmu = data; - struct platform_device *pmu_device = cpu_pmu->plat_device; - int irq = platform_get_irq(pmu_device, 0); + int irq = *(int *)data; enable_percpu_irq(irq, IRQ_TYPE_NONE); - cpumask_set_cpu(smp_processor_id(), &cpu_pmu->active_irqs); } static void cpu_pmu_disable_percpu_irq(void *data) { - struct arm_pmu *cpu_pmu = data; - struct platform_device *pmu_device = cpu_pmu->plat_device; - int irq = platform_get_irq(pmu_device, 0); + int irq = *(int *)data; - cpumask_clear_cpu(smp_processor_id(), &cpu_pmu->active_irqs); disable_percpu_irq(irq); } @@ -103,7 +97,7 @@ static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu) irq = platform_get_irq(pmu_device, 0); if (irq >= 0 && irq_is_percpu(irq)) { - on_each_cpu(cpu_pmu_disable_percpu_irq, cpu_pmu, 1); + on_each_cpu(cpu_pmu_disable_percpu_irq, &irq, 1); free_percpu_irq(irq, &percpu_pmu); } else { for (i = 0; i < irqs; ++i) { @@ -138,7 +132,7 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler) irq); return err; } - on_each_cpu(cpu_pmu_enable_percpu_irq, cpu_pmu, 1); + on_each_cpu(cpu_pmu_enable_percpu_irq, &irq, 1); } else { for (i = 0; i < irqs; ++i) { err = 0; |