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Date: Wed, 18 Nov 2020 08:53:57 -0800
From: Rob Clark <robdclark@...il.com>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Daniel Vetter <daniel@...ll.ch>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Rob Clark <robdclark@...omium.org>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<freedreno@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>,
"Menon, Nishanth" <nm@...com>
Subject: Re: [PATCH v2 07/22] drm/msm: Do rpm get sooner in the submit path
On Tue, Nov 17, 2020 at 9:28 PM Viresh Kumar <viresh.kumar@...aro.org> wrote:
>
> On 17-11-20, 09:02, Rob Clark wrote:
> > With that on top of the previous patch,
>
> Don't you still have this ? Which fixed the lockdep in the remove path.
>
> https://lore.kernel.org/lkml/20201022080644.2ck4okrxygmkuatn@vireshk-i7/
>
> To make it clear you need these patches to fix the OPP stuff:
>
> //From 5.10-rc3 (the one from the above link).
> commit e0df59de670b ("opp: Reduce the size of critical section in _opp_table_kref_release()")
>
> //Below two from linux-next
> commit ef43f01ac069 ("opp: Always add entries in dev_list with opp_table->lock held")
> commit 27c09484dd3d ("opp: Allocate the OPP table outside of opp_table_lock")
>
> This matches the diff I gave you earlier.
>
no, I did not have all three, only "opp: Allocate the OPP table
outside of opp_table_lock" plus the fixup. But with all three:
[ 27.072188] ======================================================
[ 27.078542] WARNING: possible circular locking dependency detected
[ 27.084897] 5.10.0-rc2+ #1 Not tainted
[ 27.088750] ------------------------------------------------------
[ 27.095103] chrome/1897 is trying to acquire lock:
[ 27.100031] ffffffdb14e4aa88 (opp_table_lock){+.+.}-{3:3}, at:
_find_opp_table+0x38/0x78
[ 27.108379]
[ 27.108379] but task is already holding lock:
[ 27.114373] ffffff8e2c8f91b0
(reservation_ww_class_mutex){+.+.}-{3:3}, at:
submit_lock_objects+0x70/0x1ec
[ 27.124212]
[ 27.124212] which lock already depends on the new lock.
[ 27.124212]
[ 27.132604]
[ 27.132604] the existing dependency chain (in reverse order) is:
[ 27.140290]
[ 27.140290] -> #4 (reservation_ww_class_mutex){+.+.}-{3:3}:
[ 27.147544] lock_acquire+0x23c/0x30c
[ 27.151848] __mutex_lock_common+0xdc/0xbc4
[ 27.156685] ww_mutex_lock_interruptible+0x84/0xec
[ 27.162142] msm_gem_fault+0x30/0x138
[ 27.166443] __do_fault+0x44/0x184
[ 27.170479] handle_mm_fault+0x754/0xc50
[ 27.175053] do_page_fault+0x230/0x354
[ 27.179444] do_translation_fault+0x40/0x54
[ 27.184277] do_mem_abort+0x44/0xac
[ 27.188402] el0_sync_compat_handler+0x15c/0x190
[ 27.193680] el0_sync_compat+0x144/0x180
[ 27.198244]
[ 27.198244] -> #3 (&mm->mmap_lock){++++}-{3:3}:
[ 27.204435] lock_acquire+0x23c/0x30c
[ 27.208738] __might_fault+0x60/0x80
[ 27.212951] compat_filldir+0x118/0x4d0
[ 27.217434] dcache_readdir+0x74/0x1e0
[ 27.221825] iterate_dir+0xd4/0x198
[ 27.225947] __arm64_compat_sys_getdents+0x6c/0x168
[ 27.231495] el0_svc_common+0xa4/0x174
[ 27.235886] do_el0_svc_compat+0x20/0x30
[ 27.240461] el0_sync_compat_handler+0x124/0x190
[ 27.245746] el0_sync_compat+0x144/0x180
[ 27.250310]
[ 27.250310] -> #2 (&sb->s_type->i_mutex_key#2){++++}-{3:3}:
[ 27.257569] lock_acquire+0x23c/0x30c
[ 27.261877] down_write+0x80/0x1dc
[ 27.265912] simple_recursive_removal+0x48/0x238
[ 27.271193] debugfs_remove+0x5c/0x78
[ 27.275502] opp_debug_remove_one+0x18/0x20
[ 27.280343] _opp_kref_release+0x40/0x74
[ 27.284917] dev_pm_opp_put_unlocked+0x44/0x64
[ 27.290015] _opp_remove_all_static+0x5c/0x90
[ 27.295029] dev_pm_opp_remove_table+0x70/0x90
[ 27.300129] dev_pm_opp_of_remove_table+0x14/0x1c
[ 27.305504] msm_dsi_host_destroy+0xd8/0x108
[ 27.310434] dsi_destroy+0x40/0x58
[ 27.314469] dsi_bind+0x8c/0x16c
[ 27.318329] component_bind_all+0xf4/0x20c
[ 27.323081] msm_drm_init+0x180/0x588
[ 27.327382] msm_drm_bind+0x1c/0x24
[ 27.331503] try_to_bring_up_master+0x160/0x1a8
[ 27.336696] component_master_add_with_match+0xc4/0x108
[ 27.342597] msm_pdev_probe+0x214/0x2a4
[ 27.347076] platform_drv_probe+0x94/0xb4
[ 27.351739] really_probe+0x138/0x348
[ 27.356041] driver_probe_device+0x80/0xb8
[ 27.360788] device_driver_attach+0x50/0x70
[ 27.365621] __driver_attach+0xb4/0xc8
[ 27.370012] bus_for_each_dev+0x80/0xc8
[ 27.374495] driver_attach+0x28/0x30
[ 27.378712] bus_add_driver+0x100/0x1d4
[ 27.383188] driver_register+0x68/0xfc
[ 27.387579] __platform_driver_register+0x48/0x50
[ 27.392957] msm_drm_register+0x64/0x68
[ 27.397434] do_one_initcall+0x1ac/0x3e4
[ 27.402011] do_initcall_level+0xa0/0xb8
[ 27.406583] do_initcalls+0x58/0x94
[ 27.410704] do_basic_setup+0x28/0x30
[ 27.415008] kernel_init_freeable+0x190/0x1d0
[ 27.420024] kernel_init+0x18/0x10c
[ 27.424146] ret_from_fork+0x10/0x18
[ 27.428362]
[ 27.428362] -> #1 (&opp_table->lock){+.+.}-{3:3}:
[ 27.434725] lock_acquire+0x23c/0x30c
[ 27.439028] __mutex_lock_common+0xdc/0xbc4
[ 27.443862] mutex_lock_nested+0x50/0x58
[ 27.448436] _find_opp_table_unlocked+0x44/0xb4
[ 27.453626] _opp_get_opp_table+0x3c/0x280
[ 27.458375] dev_pm_opp_get_opp_table_indexed+0x14/0x1c
[ 27.464281] of_genpd_add_provider_onecell+0xd8/0x1c0
[ 27.470019] rpmhpd_probe+0x244/0x26c
[ 27.474323] platform_drv_probe+0x94/0xb4
[ 27.478985] really_probe+0x138/0x348
[ 27.483287] driver_probe_device+0x80/0xb8
[ 27.488033] __device_attach_driver+0x90/0xa8
[ 27.493047] bus_for_each_drv+0x84/0xcc
[ 27.497524] __device_attach+0xc0/0x148
[ 27.502007] device_initial_probe+0x18/0x20
[ 27.506840] bus_probe_device+0x38/0x98
[ 27.511317] device_add+0x214/0x3c8
[ 27.515443] of_device_add+0x3c/0x48
[ 27.519654] of_platform_device_create_pdata+0xac/0xec
[ 27.525473] of_platform_bus_create+0x1cc/0x348
[ 27.530664] of_platform_populate+0x78/0xc8
[ 27.535496] devm_of_platform_populate+0x5c/0xa4
[ 27.540779] rpmh_rsc_probe+0x370/0x3d0
[ 27.545253] platform_drv_probe+0x94/0xb4
[ 27.549916] really_probe+0x138/0x348
[ 27.554223] driver_probe_device+0x80/0xb8
[ 27.558971] __device_attach_driver+0x90/0xa8
[ 27.563988] bus_for_each_drv+0x84/0xcc
[ 27.568465] __device_attach+0xc0/0x148
[ 27.572942] device_initial_probe+0x18/0x20
[ 27.577778] bus_probe_device+0x38/0x98
[ 27.582263] fw_devlink_resume+0xdc/0x110
[ 27.586930] of_platform_default_populate_init+0xb8/0xd0
[ 27.592923] do_one_initcall+0x1ac/0x3e4
[ 27.597489] do_initcall_level+0xa0/0xb8
[ 27.602051] do_initcalls+0x58/0x94
[ 27.606175] do_basic_setup+0x28/0x30
[ 27.610472] kernel_init_freeable+0x190/0x1d0
[ 27.615493] kernel_init+0x18/0x10c
[ 27.619616] ret_from_fork+0x10/0x18
[ 27.623823]
[ 27.623823] -> #0 (opp_table_lock){+.+.}-{3:3}:
[ 27.630006] check_noncircular+0x12c/0x134
[ 27.634757] __lock_acquire+0x2288/0x2b2c
[ 27.639419] lock_acquire+0x23c/0x30c
[ 27.643727] __mutex_lock_common+0xdc/0xbc4
[ 27.648566] mutex_lock_nested+0x50/0x58
[ 27.653133] _find_opp_table+0x38/0x78
[ 27.657520] dev_pm_opp_find_freq_exact+0x2c/0xdc
[ 27.662890] a6xx_gmu_resume+0xcc/0xed0
[ 27.667372] a6xx_pm_resume+0x140/0x174
[ 27.671849] adreno_resume+0x24/0x2c
[ 27.676070] pm_generic_runtime_resume+0x2c/0x3c
[ 27.681351] __rpm_callback+0x74/0x114
[ 27.685741] rpm_callback+0x30/0x84
[ 27.689865] rpm_resume+0x3c8/0x4f0
[ 27.693989] __pm_runtime_resume+0x80/0xa4
[ 27.698742] msm_gpu_submit+0x60/0x228
[ 27.703136] msm_ioctl_gem_submit+0xba0/0xc1c
[ 27.708158] drm_ioctl_kernel+0xa0/0x11c
[ 27.712724] drm_ioctl+0x240/0x3dc
[ 27.716762] drm_compat_ioctl+0xd4/0xe4
[ 27.721244] __arm64_compat_sys_ioctl+0xc4/0xf8
[ 27.726435] el0_svc_common+0xa4/0x174
[ 27.730827] do_el0_svc_compat+0x20/0x30
[ 27.735395] el0_sync_compat_handler+0x124/0x190
[ 27.740675] el0_sync_compat+0x144/0x180
[ 27.745240]
[ 27.745240] other info that might help us debug this:
[ 27.745240]
[ 27.753459] Chain exists of:
[ 27.753459] opp_table_lock --> &mm->mmap_lock -->
reservation_ww_class_mutex
[ 27.753459]
[ 27.765342] Possible unsafe locking scenario:
[ 27.765342]
[ 27.771422] CPU0 CPU1
[ 27.776085] ---- ----
[ 27.780747] lock(reservation_ww_class_mutex);
[ 27.785413] lock(&mm->mmap_lock);
[ 27.791591] lock(reservation_ww_class_mutex);
[ 27.798833] lock(opp_table_lock);
[ 27.802428]
[ 27.802428] *** DEADLOCK ***
[ 27.802428]
[ 27.808506] 3 locks held by chrome/1897:
[ 27.812540] #0: ffffff8e05f91138 (&dev->struct_mutex){+.+.}-{3:3},
at: msm_ioctl_gem_submit+0x238/0xc1c
[ 27.822295] #1: ffffff8e1ebd2670
(reservation_ww_class_acquire){+.+.}-{0:0}, at:
msm_ioctl_gem_submit+0x978/0xc1c
[ 27.832930] #2: ffffff8e2c8f91b0
(reservation_ww_class_mutex){+.+.}-{3:3}, at:
submit_lock_objects+0x70/0x1ec
[ 27.843216]
[ 27.843216] stack backtrace:
[ 27.847702] CPU: 5 PID: 1897 Comm: chrome Not tainted 5.10.0-rc2+ #1
[ 27.854235] Hardware name: Google Lazor (rev1+) with LTE (DT)
[ 27.860142] Call trace:
[ 27.862662] dump_backtrace+0x0/0x1b4
[ 27.866426] show_stack+0x1c/0x24
[ 27.869847] dump_stack+0xdc/0x158
[ 27.873349] print_circular_bug+0x308/0x338
[ 27.877647] check_noncircular+0x12c/0x134
[ 27.881858] __lock_acquire+0x2288/0x2b2c
[ 27.885984] lock_acquire+0x23c/0x30c
[ 27.889753] __mutex_lock_common+0xdc/0xbc4
[ 27.894054] mutex_lock_nested+0x50/0x58
[ 27.898086] _find_opp_table+0x38/0x78
[ 27.901946] dev_pm_opp_find_freq_exact+0x2c/0xdc
[ 27.906784] a6xx_gmu_resume+0xcc/0xed0
[ 27.910734] a6xx_pm_resume+0x140/0x174
[ 27.914684] adreno_resume+0x24/0x2c
[ 27.918363] pm_generic_runtime_resume+0x2c/0x3c
[ 27.923113] __rpm_callback+0x74/0x114
[ 27.926975] rpm_callback+0x30/0x84
[ 27.930565] rpm_resume+0x3c8/0x4f0
[ 27.934154] __pm_runtime_resume+0x80/0xa4
[ 27.938373] msm_gpu_submit+0x60/0x228
[ 27.942233] msm_ioctl_gem_submit+0xba0/0xc1c
[ 27.946713] drm_ioctl_kernel+0xa0/0x11c
[ 27.950749] drm_ioctl+0x240/0x3dc
[ 27.954256] drm_compat_ioctl+0xd4/0xe4
[ 27.958207] __arm64_compat_sys_ioctl+0xc4/0xf8
[ 27.962871] el0_svc_common+0xa4/0x174
[ 27.966731] do_el0_svc_compat+0x20/0x30
[ 27.970766] el0_sync_compat_handler+0x124/0x190
[ 27.975516] el0_sync_compat+0x144/0x180
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