linux-kernel - Re: [V3] cpufreq: powernv: Fix the hardlockup by synchronus smp

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Date:   Sat, 28 Apr 2018 21:12:43 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        rjw@...ysocki.net, viresh.kumar@...aro.org
Cc:     linux-pm@...r.kernel.org, ppaidipe@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, npiggin@...il.com,
        stable@...r.kernel.org,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [V3] cpufreq: powernv: Fix the hardlockup by synchronus smp_call in timer interrupt

On Wed, 2018-04-25 at 10:59:31 UTC, Shilpasri G Bhat wrote:
> gpstate_timer_handler() uses synchronous smp_call to set the pstate
> on the requested core. This causes the below hard lockup:
> 
> [c000003fe566b320] [c0000000001d5340] smp_call_function_single+0x110/0x180 (unreliable)
> [c000003fe566b390] [c0000000001d55e0] smp_call_function_any+0x180/0x250
> [c000003fe566b3f0] [c000000000acd3e8] gpstate_timer_handler+0x1e8/0x580
> [c000003fe566b4a0] [c0000000001b46b0] call_timer_fn+0x50/0x1c0
> [c000003fe566b520] [c0000000001b4958] expire_timers+0x138/0x1f0
> [c000003fe566b590] [c0000000001b4bf8] run_timer_softirq+0x1e8/0x270
> [c000003fe566b630] [c000000000d0d6c8] __do_softirq+0x158/0x3e4
> [c000003fe566b710] [c000000000114be8] irq_exit+0xe8/0x120
> [c000003fe566b730] [c000000000024d0c] timer_interrupt+0x9c/0xe0
> [c000003fe566b760] [c000000000009014] decrementer_common+0x114/0x120
> -- interrupt: 901 at doorbell_global_ipi+0x34/0x50
> LR = arch_send_call_function_ipi_mask+0x120/0x130
> [c000003fe566ba50] [c00000000004876c]
> arch_send_call_function_ipi_mask+0x4c/0x130
> [c000003fe566ba90] [c0000000001d59f0] smp_call_function_many+0x340/0x450
> [c000003fe566bb00] [c000000000075f18] pmdp_invalidate+0x98/0xe0
> [c000003fe566bb30] [c0000000003a1120] change_huge_pmd+0xe0/0x270
> [c000003fe566bba0] [c000000000349278] change_protection_range+0xb88/0xe40
> [c000003fe566bcf0] [c0000000003496c0] mprotect_fixup+0x140/0x340
> [c000003fe566bdb0] [c000000000349a74] SyS_mprotect+0x1b4/0x350
> [c000003fe566be30] [c00000000000b184] system_call+0x58/0x6c
> 
> One way to avoid this is removing the smp-call. We can ensure that the timer
> always runs on one of the policy-cpus. If the timer gets migrated to a
> cpu outside the policy then re-queue it back on the policy->cpus. This way
> we can get rid of the smp-call which was being used to set the pstate
> on the policy->cpus.
> 
> Fixes: 7bc54b652f13 (timers, cpufreq/powernv: Initialize the gpstate timer as pinned)
> Cc: <stable@...r.kernel.org>        [4.8+]
> Reported-by: Nicholas Piggin <npiggin@...il.com>
> Reported-by: Pridhiviraj Paidipeddi <ppaidipe@...ux.vnet.ibm.com>
> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
> Acked-by: Nicholas Piggin <npiggin@...il.com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> Acked-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/c0f7f5b6c69107ca92909512533e70

cheers