1 files changed, 151 insertions, 24 deletions

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 4df7c2ef8576..448293eb638d 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -62,6 +62,11 @@ static inline void
 fw_domain_reset(struct drm_i915_private *i915,
 		const struct intel_uncore_forcewake_domain *d)
 {
+	/*
+	 * We don't really know if the powerwell for the forcewake domain we are
+	 * trying to reset here does exist at this point (engines could be fused
+	 * off in ICL+), so no waiting for acks
+	 */
 	__raw_i915_write32(i915, d->reg_set, i915->uncore.fw_reset);
 }
 
@@ -134,7 +139,9 @@ fw_domain_wait_ack_with_fallback(const struct drm_i915_private *i915,
 	 * in the hope that the original ack will be delivered along with
 	 * the fallback ack.
 	 *
-	 * This workaround is described in HSDES #1604254524
+	 * This workaround is described in HSDES #1604254524 and it's known as:
+	 * WaRsForcewakeAddDelayForAck:skl,bxt,kbl,glk,cfl,cnl,icl
+	 * although the name is a bit misleading.
 	 */
 
 	pass = 1;
@@ -1353,6 +1360,23 @@ static void fw_domain_init(struct drm_i915_private *dev_priv,
 	fw_domain_reset(dev_priv, d);
 }
 
+static void fw_domain_fini(struct drm_i915_private *dev_priv,
+			   enum forcewake_domain_id domain_id)
+{
+	struct intel_uncore_forcewake_domain *d;
+
+	if (WARN_ON(domain_id >= FW_DOMAIN_ID_COUNT))
+		return;
+
+	d = &dev_priv->uncore.fw_domain[domain_id];
+
+	WARN_ON(d->wake_count);
+	WARN_ON(hrtimer_cancel(&d->timer));
+	memset(d, 0, sizeof(*d));
+
+	dev_priv->uncore.fw_domains &= ~BIT(domain_id);
+}
+
 static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv)
 {
 	if (INTEL_GEN(dev_priv) <= 5 || intel_vgpu_active(dev_priv))
@@ -1372,7 +1396,8 @@ static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv)
 	if (INTEL_GEN(dev_priv) >= 11) {
 		int i;
 
-		dev_priv->uncore.funcs.force_wake_get = fw_domains_get;
+		dev_priv->uncore.funcs.force_wake_get =
+			fw_domains_get_with_fallback;
 		dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
 		fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
 			       FORCEWAKE_RENDER_GEN9,
@@ -1565,6 +1590,40 @@ void intel_uncore_init(struct drm_i915_private *dev_priv)
 		&dev_priv->uncore.pmic_bus_access_nb);
 }
 
+/*
+ * We might have detected that some engines are fused off after we initialized
+ * the forcewake domains. Prune them, to make sure they only reference existing
+ * engines.
+ */
+void intel_uncore_prune(struct drm_i915_private *dev_priv)
+{
+	if (INTEL_GEN(dev_priv) >= 11) {
+		enum forcewake_domains fw_domains = dev_priv->uncore.fw_domains;
+		enum forcewake_domain_id domain_id;
+		int i;
+
+		for (i = 0; i < I915_MAX_VCS; i++) {
+			domain_id = FW_DOMAIN_ID_MEDIA_VDBOX0 + i;
+
+			if (HAS_ENGINE(dev_priv, _VCS(i)))
+				continue;
+
+			if (fw_domains & BIT(domain_id))
+				fw_domain_fini(dev_priv, domain_id);
+		}
+
+		for (i = 0; i < I915_MAX_VECS; i++) {
+			domain_id = FW_DOMAIN_ID_MEDIA_VEBOX0 + i;
+
+			if (HAS_ENGINE(dev_priv, _VECS(i)))
+				continue;
+
+			if (fw_domains & BIT(domain_id))
+				fw_domain_fini(dev_priv, domain_id);
+		}
+	}
+}
+
 void intel_uncore_fini(struct drm_i915_private *dev_priv)
 {
 	/* Paranoia: make sure we have disabled everything before we exit. */
@@ -1646,11 +1705,10 @@ static void gen3_stop_engine(struct intel_engine_cs *engine)
 	const i915_reg_t mode = RING_MI_MODE(base);
 
 	I915_WRITE_FW(mode, _MASKED_BIT_ENABLE(STOP_RING));
-	if (intel_wait_for_register_fw(dev_priv,
-				       mode,
-				       MODE_IDLE,
-				       MODE_IDLE,
-				       500))
+	if (__intel_wait_for_register_fw(dev_priv,
+					 mode, MODE_IDLE, MODE_IDLE,
+					 500, 0,
+					 NULL))
 		DRM_DEBUG_DRIVER("%s: timed out on STOP_RING\n",
 				 engine->name);
 
@@ -1804,9 +1862,10 @@ static int gen6_hw_domain_reset(struct drm_i915_private *dev_priv,
 	__raw_i915_write32(dev_priv, GEN6_GDRST, hw_domain_mask);
 
 	/* Wait for the device to ack the reset requests */
-	err = intel_wait_for_register_fw(dev_priv,
-					  GEN6_GDRST, hw_domain_mask, 0,
-					  500);
+	err = __intel_wait_for_register_fw(dev_priv,
+					   GEN6_GDRST, hw_domain_mask, 0,
+					   500, 0,
+					   NULL);
 	if (err)
 		DRM_DEBUG_DRIVER("Wait for 0x%08x engines reset failed\n",
 				 hw_domain_mask);
@@ -1854,6 +1913,50 @@ static int gen6_reset_engines(struct drm_i915_private *dev_priv,
 }
 
 /**
+ * gen11_reset_engines - reset individual engines
+ * @dev_priv: i915 device
+ * @engine_mask: mask of intel_ring_flag() engines or ALL_ENGINES for full reset
+ *
+ * This function will reset the individual engines that are set in engine_mask.
+ * If you provide ALL_ENGINES as mask, full global domain reset will be issued.
+ *
+ * Note: It is responsibility of the caller to handle the difference between
+ * asking full domain reset versus reset for all available individual engines.
+ *
+ * Returns 0 on success, nonzero on error.
+ */
+static int gen11_reset_engines(struct drm_i915_private *dev_priv,
+			       unsigned engine_mask)
+{
+	struct intel_engine_cs *engine;
+	const u32 hw_engine_mask[I915_NUM_ENGINES] = {
+		[RCS] = GEN11_GRDOM_RENDER,
+		[BCS] = GEN11_GRDOM_BLT,
+		[VCS] = GEN11_GRDOM_MEDIA,
+		[VCS2] = GEN11_GRDOM_MEDIA2,
+		[VCS3] = GEN11_GRDOM_MEDIA3,
+		[VCS4] = GEN11_GRDOM_MEDIA4,
+		[VECS] = GEN11_GRDOM_VECS,
+		[VECS2] = GEN11_GRDOM_VECS2,
+	};
+	u32 hw_mask;
+
+	BUILD_BUG_ON(VECS2 + 1 != I915_NUM_ENGINES);
+
+	if (engine_mask == ALL_ENGINES) {
+		hw_mask = GEN11_GRDOM_FULL;
+	} else {
+		unsigned int tmp;
+
+		hw_mask = 0;
+		for_each_engine_masked(engine, dev_priv, engine_mask, tmp)
+			hw_mask |= hw_engine_mask[engine->id];
+	}
+
+	return gen6_hw_domain_reset(dev_priv, hw_mask);
+}
+
+/**
  * __intel_wait_for_register_fw - wait until register matches expected state
  * @dev_priv: the i915 device
  * @reg: the register to read
@@ -1940,7 +2043,7 @@ int __intel_wait_for_register(struct drm_i915_private *dev_priv,
 	u32 reg_value;
 	int ret;
 
-	might_sleep();
+	might_sleep_if(slow_timeout_ms);
 
 	spin_lock_irq(&dev_priv->uncore.lock);
 	intel_uncore_forcewake_get__locked(dev_priv, fw);
@@ -1952,7 +2055,7 @@ int __intel_wait_for_register(struct drm_i915_private *dev_priv,
 	intel_uncore_forcewake_put__locked(dev_priv, fw);
 	spin_unlock_irq(&dev_priv->uncore.lock);
 
-	if (ret)
+	if (ret && slow_timeout_ms)
 		ret = __wait_for(reg_value = I915_READ_NOTRACE(reg),
 				 (reg_value & mask) == value,
 				 slow_timeout_ms * 1000, 10, 1000);
@@ -1971,11 +2074,12 @@ static int gen8_reset_engine_start(struct intel_engine_cs *engine)
 	I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
 		      _MASKED_BIT_ENABLE(RESET_CTL_REQUEST_RESET));
 
-	ret = intel_wait_for_register_fw(dev_priv,
-					 RING_RESET_CTL(engine->mmio_base),
-					 RESET_CTL_READY_TO_RESET,
-					 RESET_CTL_READY_TO_RESET,
-					 700);
+	ret = __intel_wait_for_register_fw(dev_priv,
+					   RING_RESET_CTL(engine->mmio_base),
+					   RESET_CTL_READY_TO_RESET,
+					   RESET_CTL_READY_TO_RESET,
+					   700, 0,
+					   NULL);
 	if (ret)
 		DRM_ERROR("%s: reset request timeout\n", engine->name);
 
@@ -2000,7 +2104,10 @@ static int gen8_reset_engines(struct drm_i915_private *dev_priv,
 		if (gen8_reset_engine_start(engine))
 			goto not_ready;
 
-	return gen6_reset_engines(dev_priv, engine_mask);
+	if (INTEL_GEN(dev_priv) >= 11)
+		return gen11_reset_engines(dev_priv, engine_mask);
+	else
+		return gen6_reset_engines(dev_priv, engine_mask);
 
 not_ready:
 	for_each_engine_masked(engine, dev_priv, engine_mask, tmp)
@@ -2038,15 +2145,31 @@ int intel_gpu_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
 	int retry;
 	int ret;
 
-	might_sleep();
+	/*
+	 * We want to perform per-engine reset from atomic context (e.g.
+	 * softirq), which imposes the constraint that we cannot sleep.
+	 * However, experience suggests that spending a bit of time waiting
+	 * for a reset helps in various cases, so for a full-device reset
+	 * we apply the opposite rule and wait if we want to. As we should
+	 * always follow up a failed per-engine reset with a full device reset,
+	 * being a little faster, stricter and more error prone for the
+	 * atomic case seems an acceptable compromise.
+	 *
+	 * Unfortunately this leads to a bimodal routine, when the goal was
+	 * to have a single reset function that worked for resetting any
+	 * number of engines simultaneously.
+	 */
+	might_sleep_if(engine_mask == ALL_ENGINES);
 
-	/* If the power well sleeps during the reset, the reset
+	/*
+	 * If the power well sleeps during the reset, the reset
 	 * request may be dropped and never completes (causing -EIO).
 	 */
 	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
 	for (retry = 0; retry < 3; retry++) {
 
-		/* We stop engines, otherwise we might get failed reset and a
+		/*
+		 * We stop engines, otherwise we might get failed reset and a
 		 * dead gpu (on elk). Also as modern gpu as kbl can suffer
 		 * from system hang if batchbuffer is progressing when
 		 * the reset is issued, regardless of READY_TO_RESET ack.
@@ -2060,9 +2183,11 @@ int intel_gpu_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
 		i915_stop_engines(dev_priv, engine_mask);
 
 		ret = -ENODEV;
-		if (reset)
+		if (reset) {
+			GEM_TRACE("engine_mask=%x\n", engine_mask);
 			ret = reset(dev_priv, engine_mask);
-		if (ret != -ETIMEDOUT)
+		}
+		if (ret != -ETIMEDOUT || engine_mask != ALL_ENGINES)
 			break;
 
 		cond_resched();
@@ -2085,12 +2210,14 @@ bool intel_has_reset_engine(struct drm_i915_private *dev_priv)
 
 int intel_reset_guc(struct drm_i915_private *dev_priv)
 {
+	u32 guc_domain = INTEL_GEN(dev_priv) >= 11 ? GEN11_GRDOM_GUC :
+						     GEN9_GRDOM_GUC;
 	int ret;
 
 	GEM_BUG_ON(!HAS_GUC(dev_priv));
 
 	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
-	ret = gen6_hw_domain_reset(dev_priv, GEN9_GRDOM_GUC);
+	ret = gen6_hw_domain_reset(dev_priv, guc_domain);
 	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 
 	return ret;