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drm/xe/migrate: Remove unneeded emit_pte() when copying CCS only

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In xe_migrate_copy(), when copy_only_ccs is true, we only need two
emit_pte() calls one for the BO and one for the raw CCS storage.
However, the current implementation issues three emit_pte() calls,
resulting in an unnecessary PTE programming job.

This fix removes the redundant emit_pte() call to avoid programming
the same PTEs twice and reducing overhead during CCS-only migration.

v2: Preserve correct behavior on DG2, which requires both CCS and
page copies.

Signed-off-by: Sanjay Yadav <sanjay.kumar.yadav@intel.com>
Suggested-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://lore.kernel.org/r/20250904161423.2448727-1-sanjay.kumar.yadav@intel.com
This commit is contained in:
Sanjay Yadav
2025-09-04 21:44:23 +05:30
committed by Matthew Auld
parent 2d1e962098
commit c4dfa0bea2
1 changed files with 10 additions and 6 deletions
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16
drivers/gpu/drm/xe/xe_migrate.c
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@@ -842,11 +842,15 @@ struct dma_fence *xe_migrate_copy(struct xe_migrate *m,
batch_size += pte_update_size(m, pte_flags, src, &src_it, &src_L0,
&src_L0_ofs, &src_L0_pt, 0, 0,
avail_pts);
pte_flags = dst_is_vram ? PTE_UPDATE_FLAG_IS_VRAM : 0;
batch_size += pte_update_size(m, pte_flags, dst, &dst_it, &src_L0,
&dst_L0_ofs, &dst_L0_pt, 0,
avail_pts, avail_pts);
if (copy_only_ccs) {
dst_L0_ofs = src_L0_ofs;
} else {
pte_flags = dst_is_vram ? PTE_UPDATE_FLAG_IS_VRAM : 0;
batch_size += pte_update_size(m, pte_flags, dst,
&dst_it, &src_L0,
&dst_L0_ofs, &dst_L0_pt,
0, avail_pts, avail_pts);
}
if (copy_system_ccs) {
xe_assert(xe, type_device);
@@ -876,7 +880,7 @@ struct dma_fence *xe_migrate_copy(struct xe_migrate *m,
if (dst_is_vram && xe_migrate_allow_identity(src_L0, &dst_it))
xe_res_next(&dst_it, src_L0);
else
else if (!copy_only_ccs)
emit_pte(m, bb, dst_L0_pt, dst_is_vram, copy_system_ccs,
&dst_it, src_L0, dst);