drm/xe/xe2: Program correct MOCS registers

The LNCFCMOCS registers no longer exist on Xe2 so there's no need to
attempt to program them.  Since GLOB_MOCS is the only set of MOCS
registers now, it's expected to be used for all platforms (both igpu and
dgpu) going forward, so adjust the MOCS programming flags accordingly.

v2:
 - Fix typo (global mocs condition is >=, not >)

Bspec: 71582
Reviewed-by: Pallavi Mishra <pallavi.mishra@intel.com>
Link: https://lore.kernel.org/r/20231031140536.303746-2-matthew.d.roper@intel.comSigned-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_mocs.c

@@ -26,6 +26,7 @@ static inline void mocs_dbg(const struct drm_device *dev,
 
 enum {
 	HAS_GLOBAL_MOCS = BIT(0),
+	HAS_LNCF_MOCS = BIT(1),
 };
 
 struct xe_mocs_entry {
@@ -473,8 +474,10 @@ static unsigned int get_mocs_settings(struct xe_device *xe,
 		return 0;
 	}
 
-	if (!IS_DGFX(xe))
+	if (!IS_DGFX(xe) || GRAPHICS_VER(xe) >= 20)
 		flags |= HAS_GLOBAL_MOCS;
+	if (GRAPHICS_VER(xe) < 20)
+		flags |= HAS_LNCF_MOCS;
 
 	return flags;
 }
@@ -505,7 +508,7 @@ static void __init_mocs_table(struct xe_gt *gt,
 	for (i = 0;
 	     i < info->n_entries ? (mocs = get_entry_control(info, i)), 1 : 0;
 	     i++) {
-		mocs_dbg(&gt_to_xe(gt)->drm, "%d 0x%x 0x%x\n", i,
+		mocs_dbg(&gt_to_xe(gt)->drm, "GLOB_MOCS[%d] 0x%x 0x%x\n", i,
 			 XELP_GLOBAL_MOCS(i).addr, mocs);
 
 		if (GRAPHICS_VERx100(gt_to_xe(gt)) > 1250)
@@ -545,7 +548,7 @@ static void init_l3cc_table(struct xe_gt *gt,
 	     (l3cc = l3cc_combine(get_entry_l3cc(info, 2 * i),
 				  get_entry_l3cc(info, 2 * i + 1))), 1 : 0;
 	     i++) {
-		mocs_dbg(&gt_to_xe(gt)->drm, "%d 0x%x 0x%x\n", i, XELP_LNCFCMOCS(i).addr,
+		mocs_dbg(&gt_to_xe(gt)->drm, "LNCFCMOCS[%d] 0x%x 0x%x\n", i, XELP_LNCFCMOCS(i).addr,
 			 l3cc);
 
 		if (GRAPHICS_VERx100(gt_to_xe(gt)) >= 1250)
@@ -570,19 +573,18 @@ void xe_mocs_init(struct xe_gt *gt)
 	unsigned int flags;
 
 	/*
-	 * LLC and eDRAM control values are not applicable to dgfx
+	 * MOCS settings are split between "GLOB_MOCS" and/or "LNCFCMOCS"
+	 * registers depending on platform.
+	 *
+	 * These registers should be programmed before GuC initialization
+	 * since their values will affect some of the memory transactions
+	 * performed by the GuC.
 	 */
 	flags = get_mocs_settings(gt_to_xe(gt), &table);
 	mocs_dbg(&gt_to_xe(gt)->drm, "flag:0x%x\n", flags);
 
 	if (flags & HAS_GLOBAL_MOCS)
 		__init_mocs_table(gt, &table);
-
-	/*
-	 * Initialize the L3CC table as part of mocs initalization to make
-	 * sure the LNCFCMOCSx registers are programmed for the subsequent
-	 * memory transactions including guc transactions
-	 */
-	if (table.table)
+	if (flags & HAS_LNCF_MOCS)
 		init_l3cc_table(gt, &table);
 }