Typo in the title: s/dispaly/display
- Joshie 🐸✨ On 3/22/21 8:11 AM, Lang Yu wrote:
In amdggpu reset, while dm.dc_lock is held by dm_suspend, handle_hpd_rx_irq tries to acquire it. Deadlock occurred! Deadlock log: [ 104.528304] amdgpu 0000:03:00.0: amdgpu: GPU reset begin! [ 104.640084] ====================================================== [ 104.640092] WARNING: possible circular locking dependency detected [ 104.640099] 5.11.0-custom #1 Tainted: G W E [ 104.640107] ------------------------------------------------------ [ 104.640114] cat/1158 is trying to acquire lock: [ 104.640120] ffff88810a09ce00 ((work_completion)(&lh->work)){+.+.}-{0:0}, at: __flush_work+0x2e3/0x450 [ 104.640144] but task is already holding lock: [ 104.640151] ffff88810a09cc70 (&adev->dm.dc_lock){+.+.}-{3:3}, at: dm_suspend+0xb2/0x1d0 [amdgpu] [ 104.640581] which lock already depends on the new lock. [ 104.640590] the existing dependency chain (in reverse order) is: [ 104.640598] -> #2 (&adev->dm.dc_lock){+.+.}-{3:3}: [ 104.640611] lock_acquire+0xca/0x390 [ 104.640623] __mutex_lock+0x9b/0x930 [ 104.640633] mutex_lock_nested+0x1b/0x20 [ 104.640640] handle_hpd_rx_irq+0x9b/0x1c0 [amdgpu] [ 104.640959] dm_irq_work_func+0x4e/0x60 [amdgpu] [ 104.641264] process_one_work+0x2a7/0x5b0 [ 104.641275] worker_thread+0x4a/0x3d0 [ 104.641283] kthread+0x125/0x160 [ 104.641290] ret_from_fork+0x22/0x30 [ 104.641300] -> #1 (&aconnector->hpd_lock){+.+.}-{3:3}: [ 104.641312] lock_acquire+0xca/0x390 [ 104.641321] __mutex_lock+0x9b/0x930 [ 104.641328] mutex_lock_nested+0x1b/0x20 [ 104.641336] handle_hpd_rx_irq+0x67/0x1c0 [amdgpu] [ 104.641635] dm_irq_work_func+0x4e/0x60 [amdgpu] [ 104.641931] process_one_work+0x2a7/0x5b0 [ 104.641940] worker_thread+0x4a/0x3d0 [ 104.641948] kthread+0x125/0x160 [ 104.641954] ret_from_fork+0x22/0x30 [ 104.641963] -> #0 ((work_completion)(&lh->work)){+.+.}-{0:0}: [ 104.641975] check_prev_add+0x94/0xbf0 [ 104.641983] __lock_acquire+0x130d/0x1ce0 [ 104.641992] lock_acquire+0xca/0x390 [ 104.642000] __flush_work+0x303/0x450 [ 104.642008] flush_work+0x10/0x20 [ 104.642016] amdgpu_dm_irq_suspend+0x93/0x100 [amdgpu] [ 104.642312] dm_suspend+0x181/0x1d0 [amdgpu] [ 104.642605] amdgpu_device_ip_suspend_phase1+0x8a/0x100 [amdgpu] [ 104.642835] amdgpu_device_ip_suspend+0x21/0x70 [amdgpu] [ 104.643066] amdgpu_device_pre_asic_reset+0x1bd/0x1d2 [amdgpu] [ 104.643403] amdgpu_device_gpu_recover.cold+0x5df/0xa9d [amdgpu] [ 104.643715] gpu_recover_get+0x2e/0x60 [amdgpu] [ 104.643951] simple_attr_read+0x6d/0x110 [ 104.643960] debugfs_attr_read+0x49/0x70 [ 104.643970] full_proxy_read+0x5f/0x90 [ 104.643979] vfs_read+0xa3/0x190 [ 104.643986] ksys_read+0x70/0xf0 [ 104.643992] __x64_sys_read+0x1a/0x20 [ 104.643999] do_syscall_64+0x38/0x90 [ 104.644007] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 104.644017] other info that might help us debug this: [ 104.644026] Chain exists of: (work_completion)(&lh->work) --> &aconnector->hpd_lock --> &adev->dm.dc_lock [ 104.644043] Possible unsafe locking scenario: [ 104.644049] CPU0 CPU1 [ 104.644055] ---- ---- [ 104.644060] lock(&adev->dm.dc_lock); [ 104.644066] lock(&aconnector->hpd_lock); [ 104.644075] lock(&adev->dm.dc_lock); [ 104.644083] lock((work_completion)(&lh->work)); [ 104.644090] *** DEADLOCK *** [ 104.644096] 3 locks held by cat/1158: [ 104.644103] #0: ffff88810d0e4eb8 (&attr->mutex){+.+.}-{3:3}, at: simple_attr_read+0x4e/0x110 [ 104.644119] #1: ffff88810a0a1600 (&adev->reset_sem){++++}-{3:3}, at: amdgpu_device_lock_adev+0x42/0x94 [amdgpu] [ 104.644489] #2: ffff88810a09cc70 (&adev->dm.dc_lock){+.+.}-{3:3}, at: dm_suspend+0xb2/0x1d0 [amdgpu] Signed-off-by: Lang Yu <lang...@amd.com> --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index e176ea84d75b..8727488df769 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2657,13 +2657,15 @@ static void handle_hpd_rx_irq(void *param) } }- mutex_lock(&adev->dm.dc_lock);+ if (!amdgpu_in_reset(adev)) + mutex_lock(&adev->dm.dc_lock); #ifdef CONFIG_DRM_AMD_DC_HDCP result = dc_link_handle_hpd_rx_irq(dc_link, &hpd_irq_data, NULL); #else result = dc_link_handle_hpd_rx_irq(dc_link, NULL, NULL); #endif - mutex_unlock(&adev->dm.dc_lock); + if (!amdgpu_in_reset(adev)) + mutex_unlock(&adev->dm.dc_lock);out:if (result && !is_mst_root_connector) {
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