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    Subject[PATCH 5.4 384/475] drm/amdgpu: Fix recursive locking warning
    Date
    From: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>

    [ Upstream commit 447c7997b62a5115ba4da846dcdee4fc12298a6a ]

    Noticed the below warning while running a pytorch workload on vega10
    GPUs. Change to trylock to avoid conflicts with already held reservation
    locks.

    [ +0.000003] WARNING: possible recursive locking detected
    [ +0.000003] 5.13.0-kfd-rajneesh #1030 Not tainted
    [ +0.000004] --------------------------------------------
    [ +0.000002] python/4822 is trying to acquire lock:
    [ +0.000004] ffff932cd9a259f8 (reservation_ww_class_mutex){+.+.}-{3:3},
    at: amdgpu_bo_release_notify+0xc4/0x160 [amdgpu]
    [ +0.000203]
    but task is already holding lock:
    [ +0.000003] ffff932cbb7181f8 (reservation_ww_class_mutex){+.+.}-{3:3},
    at: ttm_eu_reserve_buffers+0x270/0x470 [ttm]
    [ +0.000017]
    other info that might help us debug this:
    [ +0.000002] Possible unsafe locking scenario:

    [ +0.000003] CPU0
    [ +0.000002] ----
    [ +0.000002] lock(reservation_ww_class_mutex);
    [ +0.000004] lock(reservation_ww_class_mutex);
    [ +0.000003]
    *** DEADLOCK ***

    [ +0.000002] May be due to missing lock nesting notation

    [ +0.000003] 7 locks held by python/4822:
    [ +0.000003] #0: ffff932c4ac028d0 (&process->mutex){+.+.}-{3:3}, at:
    kfd_ioctl_map_memory_to_gpu+0x10b/0x320 [amdgpu]
    [ +0.000232] #1: ffff932c55e830a8 (&info->lock#2){+.+.}-{3:3}, at:
    amdgpu_amdkfd_gpuvm_map_memory_to_gpu+0x64/0xf60 [amdgpu]
    [ +0.000241] #2: ffff932cc45b5e68 (&(*mem)->lock){+.+.}-{3:3}, at:
    amdgpu_amdkfd_gpuvm_map_memory_to_gpu+0xdf/0xf60 [amdgpu]
    [ +0.000236] #3: ffffb2b35606fd28
    (reservation_ww_class_acquire){+.+.}-{0:0}, at:
    amdgpu_amdkfd_gpuvm_map_memory_to_gpu+0x232/0xf60 [amdgpu]
    [ +0.000235] #4: ffff932cbb7181f8
    (reservation_ww_class_mutex){+.+.}-{3:3}, at:
    ttm_eu_reserve_buffers+0x270/0x470 [ttm]
    [ +0.000015] #5: ffffffffc045f700 (*(sspp++)){....}-{0:0}, at:
    drm_dev_enter+0x5/0xa0 [drm]
    [ +0.000038] #6: ffff932c52da7078 (&vm->eviction_lock){+.+.}-{3:3},
    at: amdgpu_vm_bo_update_mapping+0xd5/0x4f0 [amdgpu]
    [ +0.000195]
    stack backtrace:
    [ +0.000003] CPU: 11 PID: 4822 Comm: python Not tainted
    5.13.0-kfd-rajneesh #1030
    [ +0.000005] Hardware name: GIGABYTE MZ01-CE0-00/MZ01-CE0-00, BIOS F02
    08/29/2018
    [ +0.000003] Call Trace:
    [ +0.000003] dump_stack+0x6d/0x89
    [ +0.000010] __lock_acquire+0xb93/0x1a90
    [ +0.000009] lock_acquire+0x25d/0x2d0
    [ +0.000005] ? amdgpu_bo_release_notify+0xc4/0x160 [amdgpu]
    [ +0.000184] ? lock_is_held_type+0xa2/0x110
    [ +0.000006] ? amdgpu_bo_release_notify+0xc4/0x160 [amdgpu]
    [ +0.000184] __ww_mutex_lock.constprop.17+0xca/0x1060
    [ +0.000007] ? amdgpu_bo_release_notify+0xc4/0x160 [amdgpu]
    [ +0.000183] ? lock_release+0x13f/0x270
    [ +0.000005] ? lock_is_held_type+0xa2/0x110
    [ +0.000006] ? amdgpu_bo_release_notify+0xc4/0x160 [amdgpu]
    [ +0.000183] amdgpu_bo_release_notify+0xc4/0x160 [amdgpu]
    [ +0.000185] ttm_bo_release+0x4c6/0x580 [ttm]
    [ +0.000010] amdgpu_bo_unref+0x1a/0x30 [amdgpu]
    [ +0.000183] amdgpu_vm_free_table+0x76/0xa0 [amdgpu]
    [ +0.000189] amdgpu_vm_free_pts+0xb8/0xf0 [amdgpu]
    [ +0.000189] amdgpu_vm_update_ptes+0x411/0x770 [amdgpu]
    [ +0.000191] amdgpu_vm_bo_update_mapping+0x324/0x4f0 [amdgpu]
    [ +0.000191] amdgpu_vm_bo_update+0x251/0x610 [amdgpu]
    [ +0.000191] update_gpuvm_pte+0xcc/0x290 [amdgpu]
    [ +0.000229] ? amdgpu_vm_bo_map+0xd7/0x130 [amdgpu]
    [ +0.000190] amdgpu_amdkfd_gpuvm_map_memory_to_gpu+0x912/0xf60
    [amdgpu]
    [ +0.000234] kfd_ioctl_map_memory_to_gpu+0x182/0x320 [amdgpu]
    [ +0.000218] kfd_ioctl+0x2b9/0x600 [amdgpu]
    [ +0.000216] ? kfd_ioctl_unmap_memory_from_gpu+0x270/0x270 [amdgpu]
    [ +0.000216] ? lock_release+0x13f/0x270
    [ +0.000006] ? __fget_files+0x107/0x1e0
    [ +0.000007] __x64_sys_ioctl+0x8b/0xd0
    [ +0.000007] do_syscall_64+0x36/0x70
    [ +0.000004] entry_SYSCALL_64_after_hwframe+0x44/0xae
    [ +0.000007] RIP: 0033:0x7fbff90a7317
    [ +0.000004] Code: b3 66 90 48 8b 05 71 4b 2d 00 64 c7 00 26 00 00 00
    48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f
    05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 41 4b 2d 00 f7 d8 64 89 01 48
    [ +0.000005] RSP: 002b:00007fbe301fe648 EFLAGS: 00000246 ORIG_RAX:
    0000000000000010
    [ +0.000006] RAX: ffffffffffffffda RBX: 00007fbcc402d820 RCX:
    00007fbff90a7317
    [ +0.000003] RDX: 00007fbe301fe690 RSI: 00000000c0184b18 RDI:
    0000000000000004
    [ +0.000003] RBP: 00007fbe301fe690 R08: 0000000000000000 R09:
    00007fbcc402d880
    [ +0.000003] R10: 0000000002001000 R11: 0000000000000246 R12:
    00000000c0184b18
    [ +0.000003] R13: 0000000000000004 R14: 00007fbf689593a0 R15:
    00007fbcc402d820

    Cc: Christian König <christian.koenig@amd.com>
    Cc: Felix Kuehling <Felix.Kuehling@amd.com>
    Cc: Alex Deucher <Alexander.Deucher@amd.com>

    Reviewed-by: Christian König <christian.koenig@amd.com>
    Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
    Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
    index 532d1842f6a3..4cc0dd494a42 100644
    --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
    +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
    @@ -1305,7 +1305,8 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
    !(abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE))
    return;

    - dma_resv_lock(bo->base.resv, NULL);
    + if (WARN_ON_ONCE(!dma_resv_trylock(bo->base.resv)))
    + return;

    r = amdgpu_fill_buffer(abo, AMDGPU_POISON, bo->base.resv, &fence);
    if (!WARN_ON(r)) {
    --
    2.35.1


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