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drm/xe/migrate: fix batch buffer sizing

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In xe_migrate_vram() the copy can straddle page boundaries, so the len
might look like a single page, but actually accounting for the offset
within the page we will need to emit more than one PTE. Otherwise in
some cases the batch buffer will be undersized leading to warnings
later.  We already have npages so use that instead.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://lore.kernel.org/r/20251022163836.191405-5-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2025-10-22 17:38:33 +01:00
parent fb188d8b00
commit 1413329456
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/xe/xe_migrate.c
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@ -1894,7 +1894,7 @@ static struct dma_fence *xe_migrate_vram(struct xe_migrate *m,
xe_assert(xe, npages * PAGE_SIZE <= MAX_PREEMPTDISABLE_TRANSFER);
batch_size += pte_update_cmd_size(len);
batch_size += pte_update_cmd_size(npages << PAGE_SHIFT);
batch_size += EMIT_COPY_DW;
bb = xe_bb_new(gt, batch_size, use_usm_batch);