drm/i915/guc: Provide mmio list to be saved/restored on engine reset

The driver must provide GuC with a list of mmio registers
that should be saved/restored during a GuC-based engine reset.
Unfortunately, the list must be dynamically allocated as its size is
variable. That means the driver must generate the list twice - once to
work out the size and a second time to actually save it.

v2:
 (Alan / CI)
  - GEN7_GT_MODE -> GEN6_GT_MODE to fix WA selftest failure

Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: Fernando Pacheco <fernando.pacheco@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210727002348.97202-16-matthew.brost@intel.com

1 files changed, 24 insertions, 22 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 3aa5ce3cda8b..9173df59821a 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -150,13 +150,14 @@ static void _wa_add(struct i915_wa_list *wal, const struct i915_wa *wa)
 }
 
 static void wa_add(struct i915_wa_list *wal, i915_reg_t reg,
-		   u32 clear, u32 set, u32 read_mask)
+		   u32 clear, u32 set, u32 read_mask, bool masked_reg)
 {
 	struct i915_wa wa = {
 		.reg  = reg,
 		.clr  = clear,
 		.set  = set,
 		.read = read_mask,
+		.masked_reg = masked_reg,
 	};
 
 	_wa_add(wal, &wa);
@@ -165,7 +166,7 @@ static void wa_add(struct i915_wa_list *wal, i915_reg_t reg,
 static void
 wa_write_clr_set(struct i915_wa_list *wal, i915_reg_t reg, u32 clear, u32 set)
 {
-	wa_add(wal, reg, clear, set, clear);
+	wa_add(wal, reg, clear, set, clear, false);
 }
 
 static void
@@ -200,20 +201,20 @@ wa_write_clr(struct i915_wa_list *wal, i915_reg_t reg, u32 clr)
 static void
 wa_masked_en(struct i915_wa_list *wal, i915_reg_t reg, u32 val)
 {
-	wa_add(wal, reg, 0, _MASKED_BIT_ENABLE(val), val);
+	wa_add(wal, reg, 0, _MASKED_BIT_ENABLE(val), val, true);
 }
 
 static void
 wa_masked_dis(struct i915_wa_list *wal, i915_reg_t reg, u32 val)
 {
-	wa_add(wal, reg, 0, _MASKED_BIT_DISABLE(val), val);
+	wa_add(wal, reg, 0, _MASKED_BIT_DISABLE(val), val, true);
 }
 
 static void
 wa_masked_field_set(struct i915_wa_list *wal, i915_reg_t reg,
 		    u32 mask, u32 val)
 {
-	wa_add(wal, reg, 0, _MASKED_FIELD(mask, val), mask);
+	wa_add(wal, reg, 0, _MASKED_FIELD(mask, val), mask, true);
 }
 
 static void gen6_ctx_workarounds_init(struct intel_engine_cs *engine,
@@ -533,10 +534,10 @@ static void icl_ctx_workarounds_init(struct intel_engine_cs *engine,
 	wa_masked_en(wal, ICL_HDC_MODE, HDC_FORCE_NON_COHERENT);
 
 	/* WaEnableFloatBlendOptimization:icl */
-	wa_write_clr_set(wal,
-			 GEN10_CACHE_MODE_SS,
-			 0, /* write-only, so skip validation */
-			 _MASKED_BIT_ENABLE(FLOAT_BLEND_OPTIMIZATION_ENABLE));
+	wa_add(wal, GEN10_CACHE_MODE_SS, 0,
+	       _MASKED_BIT_ENABLE(FLOAT_BLEND_OPTIMIZATION_ENABLE),
+	       0 /* write-only, so skip validation */,
+	       true);
 
 	/* WaDisableGPGPUMidThreadPreemption:icl */
 	wa_masked_field_set(wal, GEN8_CS_CHICKEN1,
@@ -581,7 +582,7 @@ static void gen12_ctx_gt_tuning_init(struct intel_engine_cs *engine,
 	       FF_MODE2,
 	       FF_MODE2_TDS_TIMER_MASK,
 	       FF_MODE2_TDS_TIMER_128,
-	       0);
+	       0, false);
 }
 
 static void gen12_ctx_workarounds_init(struct intel_engine_cs *engine,
@@ -619,7 +620,7 @@ static void gen12_ctx_workarounds_init(struct intel_engine_cs *engine,
 	       FF_MODE2,
 	       FF_MODE2_GS_TIMER_MASK,
 	       FF_MODE2_GS_TIMER_224,
-	       0);
+	       0, false);
 
 	/*
 	 * Wa_14012131227:dg1
@@ -795,7 +796,7 @@ hsw_gt_workarounds_init(struct drm_i915_private *i915, struct i915_wa_list *wal)
 	wa_add(wal,
 	       HSW_ROW_CHICKEN3, 0,
 	       _MASKED_BIT_ENABLE(HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE),
-		0 /* XXX does this reg exist? */);
+	       0 /* XXX does this reg exist? */, true);
 
 	/* WaVSRefCountFullforceMissDisable:hsw */
 	wa_write_clr(wal, GEN7_FF_THREAD_MODE, GEN7_FF_VS_REF_CNT_FFME);
@@ -1824,10 +1825,10 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 		 * disable bit, which we don't touch here, but it's good
 		 * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM).
 		 */
-		wa_add(wal, GEN7_GT_MODE, 0,
-		       _MASKED_FIELD(GEN6_WIZ_HASHING_MASK,
-				     GEN6_WIZ_HASHING_16x4),
-		       GEN6_WIZ_HASHING_16x4);
+		wa_masked_field_set(wal,
+				    GEN7_GT_MODE,
+				    GEN6_WIZ_HASHING_MASK,
+				    GEN6_WIZ_HASHING_16x4);
 	}
 
 	if (IS_GRAPHICS_VER(i915, 6, 7))
@@ -1877,10 +1878,10 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 		 * disable bit, which we don't touch here, but it's good
 		 * to keep in mind (see 3DSTATE_PS and 3DSTATE_WM).
 		 */
-		wa_add(wal,
-		       GEN6_GT_MODE, 0,
-		       _MASKED_FIELD(GEN6_WIZ_HASHING_MASK, GEN6_WIZ_HASHING_16x4),
-		       GEN6_WIZ_HASHING_16x4);
+		wa_masked_field_set(wal,
+				    GEN6_GT_MODE,
+				    GEN6_WIZ_HASHING_MASK,
+				    GEN6_WIZ_HASHING_16x4);
 
 		/* WaDisable_RenderCache_OperationalFlush:snb */
 		wa_masked_dis(wal, CACHE_MODE_0, RC_OP_FLUSH_ENABLE);
@@ -1901,7 +1902,7 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 		wa_add(wal, MI_MODE,
 		       0, _MASKED_BIT_ENABLE(VS_TIMER_DISPATCH),
 		       /* XXX bit doesn't stick on Broadwater */
-		       IS_I965G(i915) ? 0 : VS_TIMER_DISPATCH);
+		       IS_I965G(i915) ? 0 : VS_TIMER_DISPATCH, true);
 
 	if (GRAPHICS_VER(i915) == 4)
 		/*
@@ -1916,7 +1917,8 @@ rcs_engine_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 		 */
 		wa_add(wal, ECOSKPD,
 		       0, _MASKED_BIT_ENABLE(ECO_CONSTANT_BUFFER_SR_DISABLE),
-		       0 /* XXX bit doesn't stick on Broadwater */);
+		       0 /* XXX bit doesn't stick on Broadwater */,
+		       true);
 }
 
 static void