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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Lang Yu <Lang.Yu@amd.com>,
	Felix Kuehling <felix.kuehling@amd.com>,
	Alex Deucher <alexander.deucher@amd.com>,
	Sasha Levin <sashal@kernel.org>,
	Felix.Kuehling@amd.com,
	christian.koenig@amd.com,
	Xinhui.Pan@amd.com,
	airlied@gmail.com,
	daniel@ffwll.ch,
	amd-gfx@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org
Subject: [PATCH AUTOSEL 6.8 3/6] drm/amdkfd: handle duplicate BOs in reserve_bo_and_cond_vms
Date: Wed,  5 Jun 2024 07:55:55 -0400
Message-ID: <20240605115602.2964993-3-sashal@kernel.org>
In-Reply-To: <20240605115602.2964993-1-sashal@kernel.org>
References: <20240605115602.2964993-1-sashal@kernel.org>
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From: Lang Yu <Lang.Yu@amd.com>

[ Upstream commit 2a705f3e49d20b59cd9e5cc3061b2d92ebe1e5f0 ]

Observed on gfx8 ASIC where KFD_IOC_ALLOC_MEM_FLAGS_AQL_QUEUE_MEM is used.
Two attachments use the same VM, root PD would be locked twice.

[   57.910418] Call Trace:
[   57.793726]  ? reserve_bo_and_cond_vms+0x111/0x1c0 [amdgpu]
[   57.793820]  amdgpu_amdkfd_gpuvm_unmap_memory_from_gpu+0x6c/0x1c0 [amdgpu]
[   57.793923]  ? idr_get_next_ul+0xbe/0x100
[   57.793933]  kfd_process_device_free_bos+0x7e/0xf0 [amdgpu]
[   57.794041]  kfd_process_wq_release+0x2ae/0x3c0 [amdgpu]
[   57.794141]  ? process_scheduled_works+0x29c/0x580
[   57.794147]  process_scheduled_works+0x303/0x580
[   57.794157]  ? __pfx_worker_thread+0x10/0x10
[   57.794160]  worker_thread+0x1a2/0x370
[   57.794165]  ? __pfx_worker_thread+0x10/0x10
[   57.794167]  kthread+0x11b/0x150
[   57.794172]  ? __pfx_kthread+0x10/0x10
[   57.794177]  ret_from_fork+0x3d/0x60
[   57.794181]  ? __pfx_kthread+0x10/0x10
[   57.794184]  ret_from_fork_asm+0x1b/0x30

Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@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_amdkfd_gpuvm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index daa66eb4f722b..36796fbc00315 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1186,7 +1186,8 @@ static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
 	int ret;
 
 	ctx->sync = &mem->sync;
-	drm_exec_init(&ctx->exec, DRM_EXEC_INTERRUPTIBLE_WAIT, 0);
+	drm_exec_init(&ctx->exec, DRM_EXEC_INTERRUPTIBLE_WAIT |
+		      DRM_EXEC_IGNORE_DUPLICATES, 0);
 	drm_exec_until_all_locked(&ctx->exec) {
 		ctx->n_vms = 0;
 		list_for_each_entry(entry, &mem->attachments, list) {
-- 
2.43.0