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drm/xe: Wait for migration job before unmapping pages

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Fix a potential GPU page fault during tt -> system moves by waiting for
migration jobs to complete before unmapping SG. This ensures that IOMMU
mappings are not prematurely torn down while a migration job is still in
progress.

v2: Use intr=false(Matt A)
v3: Update commit message(Matt A)
v4: s/DMA_RESV_USAGE_BOOKKEEP/DMA_RESV_USAGE_KERNEL(Thomas)

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/3466
Fixes: 75521e8b56 ("drm/xe: Perform dma_map when moving system buffer objects to TT")
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: stable@vger.kernel.org # v6.11+
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241213122415.3880017-2-nirmoy.das@intel.com
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
This commit is contained in:
Nirmoy Das 2024-12-13 13:24:15 +01:00
parent dc5e20ae1f
commit cda06412c0
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/xe/xe_bo.c
View File

@ -857,8 +857,16 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
out:
if ((!ttm_bo->resource || ttm_bo->resource->mem_type == XE_PL_SYSTEM) &&
ttm_bo->ttm)
ttm_bo->ttm) {
long timeout = dma_resv_wait_timeout(ttm_bo->base.resv,
DMA_RESV_USAGE_KERNEL,
false,
MAX_SCHEDULE_TIMEOUT);
if (timeout < 0)
ret = timeout;
xe_tt_unmap_sg(ttm_bo->ttm);
}
return ret;
}