drm/xe/xe3: Generate and store the L3 bank mask

On Xe3, the register used to indicate which L3 banks are enabled on
the system is a new one called MIRROR_L3BANK_ENABLE. Each bit
represents one bank enabled in each node.
Extend the existing topology code for Xe3 to read this register and
generate the correct L3 bank mask, which can be read by user space
throug the topology query.

Bspec: 72573, 73439
Signed-off-by: Francois Dugast <francois.dugast@intel.com>
Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250114203853.35055-1-matthew.s.atwood@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>

Author: ifdu

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -221,6 +221,9 @@
 
 #define MIRROR_FUSE1				XE_REG(0x911c)
 
+#define MIRROR_L3BANK_ENABLE			XE_REG(0x9130)
+#define   XE3_L3BANK_ENABLE			REG_GENMASK(31, 0)
+
 #define XELP_EU_ENABLE				XE_REG(0x9134)	/* "_DISABLE" on Xe_LP */
 #define   XELP_EU_MASK				REG_GENMASK(7, 0)
 #define XELP_GT_SLICE_ENABLE			XE_REG(0x9138)

drivers/gpu/drm/xe/xe_gt_topology.c

@@ -129,7 +129,8 @@ static void
 load_l3_bank_mask(struct xe_gt *gt, xe_l3_bank_mask_t l3_bank_mask)
 {
 	struct xe_device *xe = gt_to_xe(gt);
-	u32 fuse3 = xe_mmio_read32(&gt->mmio, MIRROR_FUSE3);
+	struct xe_mmio *mmio = &gt->mmio;
+	u32 fuse3 = xe_mmio_read32(mmio, MIRROR_FUSE3);
 
 	/*
 	 * PTL platforms with media version 30.00 do not provide proper values
@@ -143,7 +144,16 @@ load_l3_bank_mask(struct xe_gt *gt, xe_l3_bank_mask_t l3_bank_mask)
 	if (XE_WA(gt, no_media_l3))
 		return;
 
-	if (GRAPHICS_VER(xe) >= 20) {
+	if (GRAPHICS_VER(xe) >= 30) {
+		xe_l3_bank_mask_t per_node = {};
+		u32 meml3_en = REG_FIELD_GET(XE2_NODE_ENABLE_MASK, fuse3);
+		u32 mirror_l3bank_enable = xe_mmio_read32(mmio, MIRROR_L3BANK_ENABLE);
+		u32 bank_val = REG_FIELD_GET(XE3_L3BANK_ENABLE, mirror_l3bank_enable);
+
+		bitmap_from_arr32(per_node, &bank_val, 32);
+		gen_l3_mask_from_pattern(xe, l3_bank_mask, per_node, 32,
+					 meml3_en);
+	} else if (GRAPHICS_VER(xe) >= 20) {
 		xe_l3_bank_mask_t per_node = {};
 		u32 meml3_en = REG_FIELD_GET(XE2_NODE_ENABLE_MASK, fuse3);
 		u32 bank_val = REG_FIELD_GET(XE2_GT_L3_MODE_MASK, fuse3);
@@ -155,7 +165,7 @@ load_l3_bank_mask(struct xe_gt *gt, xe_l3_bank_mask_t l3_bank_mask)
 		xe_l3_bank_mask_t per_node = {};
 		xe_l3_bank_mask_t per_mask_bit = {};
 		u32 meml3_en = REG_FIELD_GET(MEML3_EN_MASK, fuse3);
-		u32 fuse4 = xe_mmio_read32(&gt->mmio, XEHP_FUSE4);
+		u32 fuse4 = xe_mmio_read32(mmio, XEHP_FUSE4);
 		u32 bank_val = REG_FIELD_GET(GT_L3_EXC_MASK, fuse4);
 
 		bitmap_set_value8(per_mask_bit, 0x3, 0);