[Intel-gfx] [PATCH 1/3] drm/i915/mtl: Define MOCS and PAT tables for MTL

[Aravind Iddamsetty <aravind.iddamsetty@intel.com>]

From: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep@intel.com>

On MTL due to the introduction of L4 cache, coherency and cacheability
selections are different and also GT can no longer allocate on LLC. The
MOCS/PAT tables needs an update.

BSpec: 44509, 45101, 44235

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep@intel.com>
Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gtt.c     | 23 +++++++-
 drivers/gpu/drm/i915/gt/intel_gtt.h     |  9 +++
 drivers/gpu/drm/i915/gt/intel_mocs.c    | 76 +++++++++++++++++++++++--
 drivers/gpu/drm/i915/gt/selftest_mocs.c |  2 +-
 drivers/gpu/drm/i915/i915_pci.c         |  1 +
 5 files changed, 105 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index 2ba3983984b9..41248029d03d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -467,6 +467,25 @@ void gtt_write_workarounds(struct intel_gt *gt)
 	}
 }
 
+static void mtl_setup_private_ppat(struct intel_uncore *uncore)
+{
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(0),
+			   MTL_PPAT_L4_0_WB);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(1),
+			   MTL_PPAT_L4_1_WT | MTL_2_COH_1W);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(2),
+			   MTL_PPAT_L4_3_UC | MTL_2_COH_1W);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(3),
+			   MTL_PPAT_L4_0_WB | MTL_2_COH_1W);
+	intel_uncore_write(uncore, GEN12_PAT_INDEX(4),
+			   MTL_PPAT_L4_0_WB | MTL_3_COH_2W);
+
+	/*
+	 * Remaining PAT entries are left at the hardware-default
+	 * fully-cached setting
+	 */
+}
+
 static void tgl_setup_private_ppat(struct intel_uncore *uncore)
 {
 	/* TGL doesn't support LLC or AGE settings */
@@ -591,7 +610,9 @@ void setup_private_pat(struct intel_gt *gt)
 
 	GEM_BUG_ON(GRAPHICS_VER(i915) < 8);
 
-	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
+	if (IS_METEORLAKE(i915))
+		mtl_setup_private_ppat(uncore);
+	else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
 		xehp_setup_private_ppat(gt);
 	else if (GRAPHICS_VER(i915) >= 12)
 		tgl_setup_private_ppat(uncore);
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 4d75ba4bb41d..43bf9188ffef 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -147,6 +147,15 @@ typedef u64 gen8_pte_t;
 #define GEN8_PDE_IPS_64K BIT(11)
 #define GEN8_PDE_PS_2M   BIT(7)
 
+#define MTL_PPAT_L4_CACHE_POLICY_MASK	REG_GENMASK(3, 2)
+#define MTL_PAT_INDEX_COH_MODE_MASK	REG_GENMASK(1, 0)
+#define MTL_PPAT_L4_3_UC	REG_FIELD_PREP(MTL_PPAT_L4_CACHE_POLICY_MASK, 3)
+#define MTL_PPAT_L4_1_WT	REG_FIELD_PREP(MTL_PPAT_L4_CACHE_POLICY_MASK, 1)
+#define MTL_PPAT_L4_0_WB	REG_FIELD_PREP(MTL_PPAT_L4_CACHE_POLICY_MASK, 0)
+#define MTL_3_COH_2W	REG_FIELD_PREP(MTL_PAT_INDEX_COH_MODE_MASK, 3)
+#define MTL_2_COH_1W	REG_FIELD_PREP(MTL_PAT_INDEX_COH_MODE_MASK, 2)
+#define MTL_0_COH_NON	REG_FIELD_PREP(MTL_PAT_INDEX_COH_MODE_MASK, 0)
+
 enum i915_cache_level;
 
 struct drm_i915_gem_object;
diff --git a/drivers/gpu/drm/i915/gt/intel_mocs.c b/drivers/gpu/drm/i915/gt/intel_mocs.c
index 49fdd509527a..27de7f57ff3d 100644
--- a/drivers/gpu/drm/i915/gt/intel_mocs.c
+++ b/drivers/gpu/drm/i915/gt/intel_mocs.c
@@ -40,6 +40,10 @@ struct drm_i915_mocs_table {
 #define LE_COS(value)		((value) << 15)
 #define LE_SSE(value)		((value) << 17)
 
+/* Defines for the tables (GLOB_MOCS_0 - GLOB_MOCS_16) */
+#define _L4_CACHEABILITY(value)	((value) << 2)
+#define IG_PAT(value)		((value) << 8)
+
 /* Defines for the tables (LNCFMOCS0 - LNCFMOCS31) - two entries per word */
 #define L3_ESC(value)		((value) << 0)
 #define L3_SCC(value)		((value) << 1)
@@ -50,6 +54,7 @@ struct drm_i915_mocs_table {
 /* Helper defines */
 #define GEN9_NUM_MOCS_ENTRIES	64  /* 63-64 are reserved, but configured. */
 #define PVC_NUM_MOCS_ENTRIES	3
+#define MTL_NUM_MOCS_ENTRIES	16
 
 /* (e)LLC caching options */
 /*
@@ -73,6 +78,12 @@ struct drm_i915_mocs_table {
 #define L3_2_RESERVED		_L3_CACHEABILITY(2)
 #define L3_3_WB			_L3_CACHEABILITY(3)
 
+/* L4 caching options */
+#define L4_0_WB			_L4_CACHEABILITY(0)
+#define L4_1_WT			_L4_CACHEABILITY(1)
+#define L4_2_RESERVED		_L4_CACHEABILITY(2)
+#define L4_3_UC			_L4_CACHEABILITY(3)
+
 #define MOCS_ENTRY(__idx, __control_value, __l3cc_value) \
 	[__idx] = { \
 		.control_value = __control_value, \
@@ -416,6 +427,57 @@ static const struct drm_i915_mocs_entry pvc_mocs_table[] = {
 	MOCS_ENTRY(2, 0, L3_3_WB),
 };
 
+static const struct drm_i915_mocs_entry mtl_mocs_table[] = {
+	/* Error - Reserved for Non-Use */
+	MOCS_ENTRY(0,
+		   IG_PAT(0),
+		   L3_LKUP(1) | L3_3_WB),
+	/* Cached - L3 + L4 */
+	MOCS_ENTRY(1,
+		   IG_PAT(1),
+		   L3_LKUP(1) | L3_3_WB),
+	/* L4 - GO:L3 */
+	MOCS_ENTRY(2,
+		   IG_PAT(1),
+		   L3_LKUP(1) | L3_1_UC),
+	/* Uncached - GO:L3 */
+	MOCS_ENTRY(3,
+		   IG_PAT(1) | L4_3_UC,
+		   L3_LKUP(1) | L3_1_UC),
+	/* L4 - GO:Mem */
+	MOCS_ENTRY(4,
+		   IG_PAT(1),
+		   L3_LKUP(1) | L3_GLBGO(1) | L3_1_UC),
+	/* Uncached - GO:Mem */
+	MOCS_ENTRY(5,
+		   IG_PAT(1) | L4_3_UC,
+		   L3_LKUP(1) | L3_GLBGO(1) | L3_1_UC),
+	/* L4 - L3:NoLKUP; GO:L3 */
+	MOCS_ENTRY(6,
+		   IG_PAT(1),
+		   L3_1_UC),
+	/* Uncached - L3:NoLKUP; GO:L3 */
+	MOCS_ENTRY(7,
+		   IG_PAT(1) | L4_3_UC,
+		   L3_1_UC),
+	/* L4 - L3:NoLKUP; GO:Mem */
+	MOCS_ENTRY(8,
+		   IG_PAT(1),
+		   L3_GLBGO(1) | L3_1_UC),
+	/* Uncached - L3:NoLKUP; GO:Mem */
+	MOCS_ENTRY(9,
+		   IG_PAT(1) | L4_3_UC,
+		   L3_GLBGO(1) | L3_1_UC),
+	/* Display - L3; L4:WT */
+	MOCS_ENTRY(14,
+		   IG_PAT(1) | L4_1_WT,
+		   L3_LKUP(1) | L3_3_WB),
+	/* CCS - Non-Displayable */
+	MOCS_ENTRY(15,
+		   IG_PAT(1),
+		   L3_GLBGO(1) | L3_1_UC),
+};
+
 enum {
 	HAS_GLOBAL_MOCS = BIT(0),
 	HAS_ENGINE_MOCS = BIT(1),
@@ -445,7 +507,13 @@ static unsigned int get_mocs_settings(const struct drm_i915_private *i915,
 	memset(table, 0, sizeof(struct drm_i915_mocs_table));
 
 	table->unused_entries_index = I915_MOCS_PTE;
-	if (IS_PONTEVECCHIO(i915)) {
+	if (IS_METEORLAKE(i915)) {
+		table->size = ARRAY_SIZE(mtl_mocs_table);
+		table->table = mtl_mocs_table;
+		table->n_entries = MTL_NUM_MOCS_ENTRIES;
+		table->uc_index = 9;
+		table->unused_entries_index = 1;
+	} else if (IS_PONTEVECCHIO(i915)) {
 		table->size = ARRAY_SIZE(pvc_mocs_table);
 		table->table = pvc_mocs_table;
 		table->n_entries = PVC_NUM_MOCS_ENTRIES;
@@ -643,9 +711,9 @@ void intel_mocs_init_engine(struct intel_engine_cs *engine)
 		init_l3cc_table(engine->gt, &table);
 }
 
-static u32 global_mocs_offset(void)
+static u32 global_mocs_offset(struct intel_gt *gt)
 {
-	return i915_mmio_reg_offset(GEN12_GLOBAL_MOCS(0));
+	return i915_mmio_reg_offset(GEN12_GLOBAL_MOCS(0)) + gt->uncore->gsi_offset;
 }
 
 void intel_set_mocs_index(struct intel_gt *gt)
@@ -668,7 +736,7 @@ void intel_mocs_init(struct intel_gt *gt)
 	 */
 	flags = get_mocs_settings(gt->i915, &table);
 	if (flags & HAS_GLOBAL_MOCS)
-		__init_mocs_table(gt->uncore, &table, global_mocs_offset());
+		__init_mocs_table(gt->uncore, &table, global_mocs_offset(gt));
 
 	/*
 	 * Initialize the L3CC table as part of mocs initalization to make
diff --git a/drivers/gpu/drm/i915/gt/selftest_mocs.c b/drivers/gpu/drm/i915/gt/selftest_mocs.c
index f27cc28608d4..66b3c6fcf1f1 100644
--- a/drivers/gpu/drm/i915/gt/selftest_mocs.c
+++ b/drivers/gpu/drm/i915/gt/selftest_mocs.c
@@ -137,7 +137,7 @@ static int read_mocs_table(struct i915_request *rq,
 		return 0;
 
 	if (HAS_GLOBAL_MOCS_REGISTERS(rq->engine->i915))
-		addr = global_mocs_offset();
+		addr = global_mocs_offset(rq->engine->gt);
 	else
 		addr = mocs_offset(rq->engine);
 
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index 414b4bfd514b..8e872cb89169 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -1147,6 +1147,7 @@ static const struct intel_device_info mtl_info = {
 	.has_flat_ccs = 0,
 	.has_gmd_id = 1,
 	.has_guc_deprivilege = 1,
+	.has_llc = 0,
 	.has_mslice_steering = 0,
 	.has_snoop = 1,
 	.__runtime.memory_regions = REGION_SMEM | REGION_STOLEN_LMEM,
-- 
2.25.1