[PATCH v2 2/3] drm/xe: Refactor emit_clear_link_copy

[Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>]

Implement a function to return the length of the MEM_SET instruction.
This is to prepare for future platforms where the length of MEM_SET
instruction is expected to change.

Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
---
 drivers/gpu/drm/xe/instructions/xe_gpu_commands.h | 1 -
 drivers/gpu/drm/xe/xe_migrate.c                   | 9 +++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/instructions/xe_gpu_commands.h b/drivers/gpu/drm/xe/instructions/xe_gpu_commands.h
index 4546c8f10516..edd204b8dfe5 100644
--- a/drivers/gpu/drm/xe/instructions/xe_gpu_commands.h
+++ b/drivers/gpu/drm/xe/instructions/xe_gpu_commands.h
@@ -37,7 +37,6 @@
 #define   MEM_COPY_DST_MOCS_INDEX_MASK	GENMASK(6, 3)
 
 #define	PVC_MEM_SET_CMD		(2 << 29 | 0x5b << 22)
-#define   PVC_MEM_SET_CMD_LEN_DW	7
 #define   PVC_MEM_SET_MATRIX		REG_BIT(17)
 #define   PVC_MEM_SET_DATA_FIELD	GENMASK(31, 24)
 /* Bspec lists field as [6:0], but index alone is from [6:1] */
diff --git a/drivers/gpu/drm/xe/xe_migrate.c b/drivers/gpu/drm/xe/xe_migrate.c
index 6ffd50050e3e..4f9be41b2f64 100644
--- a/drivers/gpu/drm/xe/xe_migrate.c
+++ b/drivers/gpu/drm/xe/xe_migrate.c
@@ -1461,12 +1461,17 @@ struct dma_fence *xe_migrate_vram_copy_chunk(struct xe_bo *vram_bo, u64 vram_off
 	return fence;
 }
 
+static u32 blt_mem_set_cmd_len(struct xe_device *xe)
+{
+	return 7;
+}
+
 static void emit_clear_link_copy(struct xe_gt *gt, struct xe_bb *bb, u64 src_ofs,
 				 u32 size, u32 pitch)
 {
 	struct xe_device *xe = gt_to_xe(gt);
 	u32 *cs = bb->cs + bb->len;
-	u32 len = PVC_MEM_SET_CMD_LEN_DW;
+	u32 len = blt_mem_set_cmd_len(xe);
 
 	*cs++ = PVC_MEM_SET_CMD | PVC_MEM_SET_MATRIX | (len - 2);
 	*cs++ = pitch - 1;
@@ -1536,7 +1541,7 @@ static u32 emit_clear_cmd_len(struct xe_gt *gt)
 	struct xe_device *xe = gt_to_xe(gt);
 
 	if (gt->info.has_xe2_blt_instructions)
-		return PVC_MEM_SET_CMD_LEN_DW;
+		return blt_mem_set_cmd_len(xe);
 	else
 		return blt_fast_color_cmd_len(xe);
 }
-- 
2.43.0