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X-CRM114-Status: GOOD ( 32.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ulf Hansson , Linux PM , "Rafael J. Wysocki" , "Rafael J. Wysocki" , Linux Kernel Mailing List , Linux-Renesas , Geert Uytterhoeven , Linux OMAP Mailing List , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Vincent, Thanks for the feedback. > Subject: Re: [PATCH v3] PM-runtime: fix deadlock with ktime > > On Fri, 1 Feb 2019 at 16:48, Vincent Guittot > wrote: > > > > On Fri, 1 Feb 2019 at 16:44, Biju Das wrote: > > > > > > Hi Vincent, > > > > > > Thanks for the feedback. Instead of reverting. I just modified the patch > like this and it fixed the issue. > > > > > > diff --git a/drivers/base/power/runtime.c > > > b/drivers/base/power/runtime.c index 4eaf166..145a182 100644 > > > --- a/drivers/base/power/runtime.c > > > +++ b/drivers/base/power/runtime.c > > > @@ -66,7 +66,7 @@ static int rpm_suspend(struct device *dev, int > rpmflags); > > > */ > > > void update_pm_runtime_accounting(struct device *dev) { > > > - u64 now = ktime_to_ns(ktime_get()); > > > + u64 now = ktime_get_mono_fast_ns(); > > > u64 delta; > > > > yes. > > This probably also need to be changed in another place > > (pm_runtime_enable) to be safe > > Our email have crossed. I just sent something similar > > In fact after more thinking, it's probably better to revert because we are not > sure to be monotonic with ktime_get_mono_fast_ns() which means that the > time account can be negative but this not yet taken into account. It's part of a > clean up patch that was on hold while working on previous problem I confirm there is no deadlock, after reverting the commit c669560be6c8 ("PM-runtime: Replace jiffies-based accounting with ktime-based accounting") Regards, Biju > > > > > > > -----Original Message----- > > > > From: linux-renesas-soc-owner@vger.kernel.org > > > owner@vger.kernel.org> On Behalf Of Vincent Guittot > > > > Sent: 01 February 2019 15:29 > > > > To: Biju Das > > > > Cc: Rafael J. Wysocki ; Linux PM > > > pm@vger.kernel.org>; Linux Kernel Mailing List > > > kernel@vger.kernel.org>; Linux ARM > > > kernel@lists.infradead.org>; Linux OMAP Mailing List > > > omap@vger.kernel.org>; Rafael J. Wysocki ; Ulf > > > > Hansson ; Geert Uytterhoeven > > > m68k.org>; Linux-Renesas > > > > Subject: Re: [PATCH v3] PM-runtime: fix deadlock with ktime > > > > > > > > On Fri, 1 Feb 2019 at 16:02, Biju Das wrote: > > > > > > > > > > Hi Vincent, > > > > > > > > > > I have rebased my kernel to "next-20190201". Still I am seeing dead > lock. > > > > > > > > > > Am I missing any patch? > > > > > > > > No you don't miss anything. > > > > I think that it's the opposite. > > > > > > > > Modification in time accounting in PM runtime has been queued but > > > > it has not moved (yet) to ktime_get_mono_fast_ns() > > > > > > > > Can you try to revert c669560be6c8 ("PM-runtime: Replace > > > > jiffies-based accounting with ktime-based accounting") ? > > > > > > > > > > > > > > root@ek874:/# echo e61e0000.timer > > > > > > /sys/devices/system/clocksource/clocksource0/current_clocksource > > > > > [ 193.869423] > > > > > [ 193.870963] > ============================================ > > > > > [ 193.876292] WARNING: possible recursive locking detected [ > > > > > 193.881625] 5.0.0-rc4-next-20190201-00007-g731346f #3 Not > > > > > tainted [ 193.887737] > > > > > -------------------------------------------- > > > > > [ 193.893066] migration/0/11 is trying to acquire lock: > > > > > [ 193.898136] (____ptrval____) (tk_core.seq){----}, at: > > > > > update_pm_runtime_accounting+0x14/0x68 > > > > > [ 193.906632] > > > > > [ 193.906632] but task is already holding lock: > > > > > [ 193.912483] (____ptrval____) (tk_core.seq){----}, at: > > > > > multi_cpu_stop+0x8c/0x140 [ 193.919828] [ 193.919828] other > > > > > info that might help us debug this: > > > > > [ 193.926377] Possible unsafe locking scenario: > > > > > [ 193.926377] > > > > > [ 193.932314] CPU0 > > > > > [ 193.934765] ---- > > > > > [ 193.937216] lock(tk_core.seq); > > > > > [ 193.940453] lock(tk_core.seq); > > > > > [ 193.943691] > > > > > [ 193.943691] *** DEADLOCK *** [ 193.943691] [ 193.949634] > > > > > May be due to missing lock nesting notation [ 193.949634] [ > > > > > 193.956446] 3 locks held by migration/0/11: > > > > > [ 193.960642] #0: (____ptrval____) (timekeeper_lock){-.-.}, at: > > > > > change_clocksource+0x2c/0x118 [ 193.969125] #1: > > > > > (____ptrval____) (tk_core.seq){----}, at: multi_cpu_stop+0x8c/0x140 > [ 193.976903] #2: > > > > > (____ptrval____) (&(&dev->power.lock)->rlock){....}, at: > > > > > __pm_runtime_resume+0x40/0x98 [ 193.986339] [ 193.986339] > > > > > stack > > > > backtrace: > > > > > [ 193.990715] CPU: 0 PID: 11 Comm: migration/0 Not tainted > > > > > 5.0.0-rc4-next-20190201-00007-g731346f #3 [ 193.999707] > > > > > Hardware > > > > > name: Silicon Linux RZ/G2E evaluation kit EK874 (CAT874 + > > > > > CAT875) (DT) [ > > > > 194.008089] Call trace: > > > > > [ 194.010553] dump_backtrace+0x0/0x178 [ 194.014227] > > > > > show_stack+0x14/0x20 [ 194.017562] dump_stack+0xb0/0xec [ > > > > > 194.020895] __lock_acquire+0xfb4/0x1c08 [ 194.024832] > > > > > lock_acquire+0xd0/0x268 [ 194.028420] ktime_get+0x5c/0x108 [ > > > > > 194.031747] update_pm_runtime_accounting+0x14/0x68 > > > > > [ 194.036643] rpm_resume+0x4ec/0x698 [ 194.040144] > > > > > __pm_runtime_resume+0x50/0x98 [ 194.044264] > > > > > sh_tmu_enable.part.1+0x24/0x50 [ 194.048462] > > > > > sh_tmu_clocksource_enable+0x48/0x70 > > > > > [ 194.053097] change_clocksource+0x84/0x118 [ 194.057208] > > > > > multi_cpu_stop+0x8c/0x140 [ 194.060970] > > > > > cpu_stopper_thread+0xac/0x120 [ 194.065087] > > > > > smpboot_thread_fn+0x1ac/0x2c8 [ 194.069198] > > > > > kthread+0x128/0x130 [ 194.072439] ret_from_fork+0x10/0x18 > > > > > > > > > > > > > > > Regards, > > > > > Biju > > > > > > > > > > > -----Original Message----- > > > > > > From: Rafael J. Wysocki > > > > > > Sent: 30 January 2019 21:53 > > > > > > To: Vincent Guittot > > > > > > Cc: Linux PM ; Linux Kernel Mailing > > > > > > List > > > > > > ; Linux ARM > > > > > kernel@lists.infradead.org>; Linux OMAP Mailing List > > > > > omap@vger.kernel.org>; Rafael J. Wysocki ; > > > > > > Ulf Hansson ; Biju Das > > > > > > ; Geert Uytterhoeven > > > > > > ; Linux-Renesas > > > > > renesas-soc@vger.kernel.org> > > > > > > Subject: Re: [PATCH v3] PM-runtime: fix deadlock with ktime > > > > > > > > > > > > On Wed, Jan 30, 2019 at 6:26 PM Vincent Guittot > > > > > > wrote: > > > > > > > > > > > > > > A deadlock has been seen when swicthing clocksources which > > > > > > > use PM > > > > > > runtime. > > > > > > > The call path is: > > > > > > > change_clocksource > > > > > > > ... > > > > > > > write_seqcount_begin > > > > > > > ... > > > > > > > timekeeping_update > > > > > > > ... > > > > > > > sh_cmt_clocksource_enable > > > > > > > ... > > > > > > > rpm_resume > > > > > > > pm_runtime_mark_last_busy > > > > > > > ktime_get > > > > > > > do > > > > > > > read_seqcount_begin > > > > > > > while read_seqcount_retry > > > > > > > .... > > > > > > > write_seqcount_end > > > > > > > > > > > > > > Although we should be safe because we haven't yet changed > > > > > > > the clocksource at that time, we can't because of seqcount > protection. > > > > > > > > > > > > > > Use ktime_get_mono_fast_ns() instead which is lock safe for > > > > > > > such case > > > > > > > > > > > > > > With ktime_get_mono_fast_ns, the timestamp is not guaranteed > > > > > > > to be monotonic across an update and as a result can goes > backward. > > > > > > > According to > > > > > > > update_fast_timekeeper() description: "In the worst case, > > > > > > > this can result is a slightly wrong timestamp (a few > > > > > > > nanoseconds)". For PM runtime autosuspend, this means only > > > > > > > that the suspend decision can be slightly sub optimal. > > > > > > > > > > > > > > Fixes: 8234f6734c5d ("PM-runtime: Switch autosuspend over to > > > > > > > using > > > > > > > hrtimers") > > > > > > > Reported-by: Biju Das > > > > > > > Signed-off-by: Vincent Guittot > > > > > > > --- > > > > > > > > > > > > > > Hi Rafael, > > > > > > > > > > > > > > Sorry, I sent the version with the typo mistake that > > > > > > > generated the compilation error reported by > > > > > > > kbuild-test-robot > > > > > > > > > > > > > > This version doesn't have the typo. > > > > > > > > > > > > OK, I've applied this one, thanks! > > > > > > > > > > > > > > > > > > > > Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, > > > > > Bourne > > > > End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales > > > > under Registered No. 04586709. > > > > > > > > > > > > Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne > End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under > Registered No. 04586709. Renesas Electronics Europe Ltd, Dukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, UK. Registered in England & Wales under Registered No. 04586709. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel