[PATCH 3/9] drm/xe/xe3: Generate and store the L3 bank mask

[Matt Atwood]

From: Francois Dugast <francois.dugast at intel.com>

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

Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Francois Dugast <francois.dugast at intel.com>
Signed-off-by: Matt Atwood <matthew.s.atwood at intel.com>
---
 drivers/gpu/drm/xe/regs/xe_gt_regs.h |  3 +++
 drivers/gpu/drm/xe/xe_gt_topology.c  | 11 ++++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
index 0d1a4a9f4e11..8ed855b31e95 100644
--- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
@@ -218,6 +218,9 @@
 
 #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)
diff --git a/drivers/gpu/drm/xe/xe_gt_topology.c b/drivers/gpu/drm/xe/xe_gt_topology.c
index 0662f71c6ede..56571380a2b5 100644
--- a/drivers/gpu/drm/xe/xe_gt_topology.c
+++ b/drivers/gpu/drm/xe/xe_gt_topology.c
@@ -129,7 +129,16 @@ 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, MIRROR_FUSE3);
 
-	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(gt, 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);
-- 
2.44.0