From: Felix Kuehling <Felix.Kuehling@amd.com>
To: amd-gfx@lists-freedesktop.org, dri-devel@lists.freedesktop.org
Cc: christian.koenig@amd.com
Subject: [PATCH 9/9] drm/amdgpu: Lock the attached dmabuf in unpopulate
Date: Wed, 14 Apr 2021 02:46:21 -0400 [thread overview]
Message-ID: <20210414064621.29273-10-Felix.Kuehling@amd.com> (raw)
In-Reply-To: <20210414064621.29273-1-Felix.Kuehling@amd.com>
amdgpu_ttm_tt_unpopulate can be called during bo_destroy. The dmabuf->resv
must not be held by the caller or dma_buf_detach will deadlock. This is
probably not the right fix. I get a recursive lock warning with the
reservation held in ttm_bo_release. Should unmap_attachment move to
backend_unbind instead?
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 936b3cfdde55..257750921eed 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1216,9 +1216,22 @@ static void amdgpu_ttm_tt_unpopulate(struct ttm_device *bdev,
if (ttm->sg && gtt->gobj->import_attach) {
struct dma_buf_attachment *attach;
+ bool locked;
attach = gtt->gobj->import_attach;
+ /* FIXME: unpopulate can be called during bo_destroy.
+ * The dmabuf->resv must not be held by the caller or
+ * dma_buf_detach will deadlock. This is probably not
+ * the right fix. I get a recursive lock warning with the
+ * reservation held in ttm_bo_releas.. Should
+ * unmap_attachment move to backend_unbind instead?
+ */
+ locked = dma_resv_is_locked(attach->dmabuf->resv);
+ if (!locked)
+ dma_resv_lock(attach->dmabuf->resv, NULL);
dma_buf_unmap_attachment(attach, ttm->sg, DMA_BIDIRECTIONAL);
+ if (!locked)
+ dma_resv_unlock(attach->dmabuf->resv);
ttm->sg = NULL;
return;
}
--
2.31.1
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next prev parent reply other threads:[~2021-04-14 6:47 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 6:46 [PATCH 0/9] Implement multi-GPU DMA mappings for KFD Felix Kuehling
2021-04-14 6:46 ` [PATCH 1/9] drm/amdgpu: Rename kfd_bo_va_list to kfd_mem_attachment Felix Kuehling
2021-04-14 6:46 ` [PATCH 2/9] drm/amdgpu: Keep a bo-reference per-attachment Felix Kuehling
2021-04-14 6:46 ` [PATCH 3/9] drm/amdgpu: Simplify AQL queue mapping Felix Kuehling
2021-04-14 6:46 ` [PATCH 4/9] drm/amdgpu: Add multi-GPU DMA mapping helpers Felix Kuehling
2021-04-14 6:46 ` [PATCH 5/9] drm/amdgpu: DMA map/unmap when updating GPU mappings Felix Kuehling
2021-04-14 6:46 ` [PATCH 6/9] drm/amdgpu: Move kfd_mem_attach outside reservation Felix Kuehling
2021-04-14 6:46 ` [PATCH 7/9] drm/amdgpu: Add DMA mapping of GTT BOs Felix Kuehling
2021-04-14 6:46 ` [PATCH 8/9] drm/ttm: Don't count pages in SG BOs against pages_limit Felix Kuehling
2021-04-14 9:13 ` Daniel Vetter
2021-04-14 6:46 ` Felix Kuehling [this message]
2021-04-14 7:33 ` [PATCH 9/9] drm/amdgpu: Lock the attached dmabuf in unpopulate Christian König
2021-04-14 15:15 ` Felix Kuehling
2021-04-14 15:15 ` Felix Kuehling
2021-04-15 7:41 ` Christian König
2021-04-15 7:41 ` Christian König
2021-04-15 14:29 ` Felix Kuehling
2021-04-15 14:29 ` Felix Kuehling
2021-04-14 6:50 ` [PATCH 0/9] Implement multi-GPU DMA mappings for KFD Felix Kuehling
2021-04-14 6:47 Felix Kuehling
2021-04-14 6:48 ` [PATCH 9/9] drm/amdgpu: Lock the attached dmabuf in unpopulate Felix Kuehling
2021-04-14 6:48 ` Felix Kuehling
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