drm/xe/migrate: Handle clear ccs logic for xe2 dgfx

For Xe2 dGPU, we clear the bo by modifying the VRAM using an
uncompressed pat index which then indirectly updates the
compression status as uncompressed i.e zeroed CCS.
So xe_migrate_clear() should be updated for BMG to not
emit CCS surf copy commands.

v2: Moved xe_device_needs_ccs_emit() to xe_migrate.c and changed
name to xe_migrate_needs_ccs_emit() since its very specific to
migration.(Matt)
Signed-off-by: Akshata Jahagirdar <akshata.jahagirdar@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/8dd869dd8dda5e17ace28c04f1a48675f5540874.1721250309.git.akshata.jahagirdar@intel.com

drivers/gpu/drm/xe/xe_migrate.c

@@ -347,6 +347,11 @@ static u32 xe_migrate_usm_logical_mask(struct xe_gt *gt)
 	return logical_mask;
 }
 
+static bool xe_migrate_needs_ccs_emit(struct xe_device *xe)
+{
+	return xe_device_has_flat_ccs(xe) && !(GRAPHICS_VER(xe) >= 20 && IS_DGFX(xe));
+}
+
 /**
  * xe_migrate_init() - Initialize a migrate context
  * @tile: Back-pointer to the tile we're initializing for.
@@ -420,7 +425,7 @@ struct xe_migrate *xe_migrate_init(struct xe_tile *tile)
 		return ERR_PTR(err);
 
 	if (IS_DGFX(xe)) {
-		if (xe_device_has_flat_ccs(xe))
+		if (xe_migrate_needs_ccs_emit(xe))
 			/* min chunk size corresponds to 4K of CCS Metadata */
 			m->min_chunk_size = SZ_4K * SZ_64K /
 				xe_device_ccs_bytes(xe, SZ_64K);
@@ -1034,7 +1039,7 @@ struct dma_fence *xe_migrate_clear(struct xe_migrate *m,
 					clear_system_ccs ? 0 : emit_clear_cmd_len(gt), 0,
 					avail_pts);
 
-		if (xe_device_has_flat_ccs(xe))
+		if (xe_migrate_needs_ccs_emit(xe))
 			batch_size += EMIT_COPY_CCS_DW;
 
 		/* Clear commands */
@@ -1062,7 +1067,7 @@ struct dma_fence *xe_migrate_clear(struct xe_migrate *m,
 		if (!clear_system_ccs)
 			emit_clear(gt, bb, clear_L0_ofs, clear_L0, XE_PAGE_SIZE, clear_vram);
 
-		if (xe_device_has_flat_ccs(xe)) {
+		if (xe_migrate_needs_ccs_emit(xe)) {
 			emit_copy_ccs(gt, bb, clear_L0_ofs, true,
 				      m->cleared_mem_ofs, false, clear_L0);
 			flush_flags = MI_FLUSH_DW_CCS;