[PATCH] drm/i915: Fallback to reserve forcewake if primary ack missing

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

There is a possibility on gen9 hardware to miss the forcewake ack
message. The recommended workaround is to use another free
bit and toggle it until original bit is successfully acknowledged.

Some future gen9 revs might or might not fix the underlying issue but
the fallback to reserve bit dance can be considered as harmless:
without the ack timeout we never reach the reserve bit forcewake.
Thus as of now we adopt a blanket approach for all gen9 and leave
the bypassing the reserve bit approach for future patches if
corresponding hw revisions do appear.

Commit 83e3337204b2 ("drm/i915: Increase maximum polling time to 50ms
for forcewake request/clear ack") did increase the forcewake timeout.
If the issue was a delayed ack, future work could include finding
a suitable timeout value both for primary ack and reserve toggle
to reduce the worst case latency.

v2: use bit 15, naming, comment (Chris), only wait fallback ack

References: HSDES #1604254524
References: https://bugs.freedesktop.org/show_bug.cgi?id=102051
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h     |   5 +-
 drivers/gpu/drm/i915/intel_uncore.c | 141 +++++++++++++++++++++++++++++++++---
 2 files changed, 134 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8c775e96b4e4..f0f8f6059652 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7774,8 +7774,9 @@ enum {
 #define  FORCEWAKE_ACK_MEDIA_GEN9		_MMIO(0x0D88)
 #define  FORCEWAKE_ACK_RENDER_GEN9		_MMIO(0x0D84)
 #define  FORCEWAKE_ACK_BLITTER_GEN9		_MMIO(0x130044)
-#define   FORCEWAKE_KERNEL			0x1
-#define   FORCEWAKE_USER			0x2
+#define   FORCEWAKE_KERNEL			BIT(0)
+#define   FORCEWAKE_USER			BIT(1)
+#define   FORCEWAKE_KERNEL_FALLBACK		BIT(15)
 #define  FORCEWAKE_MT_ACK			_MMIO(0x130040)
 #define  ECOBUS					_MMIO(0xa180)
 #define    FORCEWAKE_MT_ENABLE			(1<<5)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 96ee6b2754be..588ae35c8c9a 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -69,17 +69,108 @@ fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
 			       HRTIMER_MODE_REL);
 }
 
+static inline int
+__wait_for_ack(const struct drm_i915_private *i915,
+	       const struct intel_uncore_forcewake_domain *d,
+	       const u32 ack,
+	       const u32 value)
+{
+	return wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) & ack) == value,
+			       FORCEWAKE_ACK_TIMEOUT_MS);
+}
+
+
+static inline int
+wait_ack_clear(const struct drm_i915_private *i915,
+	       const struct intel_uncore_forcewake_domain *d,
+	       const u32 ack)
+{
+	return __wait_for_ack(i915, d, ack, 0);
+}
+
+static inline int
+wait_ack_set(const struct drm_i915_private *i915,
+	     const struct intel_uncore_forcewake_domain *d,
+	     const u32 ack)
+{
+	return __wait_for_ack(i915, d, ack, ack);
+}
+
 static inline void
 fw_domain_wait_ack_clear(const struct drm_i915_private *i915,
 			 const struct intel_uncore_forcewake_domain *d)
 {
-	if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
-			     FORCEWAKE_KERNEL) == 0,
-			    FORCEWAKE_ACK_TIMEOUT_MS))
+	if (wait_ack_clear(i915, d, FORCEWAKE_KERNEL))
 		DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n",
 			  intel_uncore_forcewake_domain_to_str(d->id));
 }
 
+static int
+wait_ack_with_fallback(const struct drm_i915_private *i915,
+		       const struct intel_uncore_forcewake_domain *d,
+		       const u32 ack,
+		       const u32 value)
+{
+	int ret;
+
+	/*
+	 * There is a possibility of driver's wake request colliding
+	 * with hardware's own wake requests and that can cause
+	 * hardware to not deliver the driver's ack message.
+	 *
+	 * Use a fallback bit toggle to kick the gpu state machine
+	 * in hopes that the original ack will be delivered along with
+	 * the fallback ack.
+	 *
+	 * This workaround is described in HSDES #1604254524
+	 */
+
+	wait_ack_clear(i915, d, FORCEWAKE_KERNEL_FALLBACK);
+	__raw_i915_write32(i915, d->reg_set,
+			   _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL_FALLBACK));
+	wait_ack_set(i915, d, FORCEWAKE_KERNEL_FALLBACK);
+
+	ret = (__raw_i915_read32(i915, d->reg_ack) & ack) == value;
+
+	__raw_i915_write32(i915, d->reg_set,
+			   _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL_FALLBACK));
+
+	return ret;
+}
+
+enum ack_type {
+	ACK_CLEAR = 0,
+	ACK_SET
+};
+
+static int
+fw_domain_wait_ack_with_fallback(const struct drm_i915_private *i915,
+				 const struct intel_uncore_forcewake_domain *d,
+				 const enum ack_type type)
+{
+	int retry = 10;
+	int ret;
+
+	do {
+		ret = wait_ack_with_fallback(i915, d, FORCEWAKE_KERNEL,
+					     type == ACK_SET ?
+					     FORCEWAKE_KERNEL : 0);
+	} while (ret && --retry);
+
+	return ret;
+}
+
+static inline void
+fw_domain_wait_ack_clear_fallback(const struct drm_i915_private *i915,
+				  const struct intel_uncore_forcewake_domain *d)
+{
+	if (likely(!wait_ack_clear(i915, d, FORCEWAKE_KERNEL)))
+		return;
+
+	if (fw_domain_wait_ack_with_fallback(i915, d, ACK_CLEAR))
+		fw_domain_wait_ack_clear(i915, d);
+}
+
 static inline void
 fw_domain_get(struct drm_i915_private *i915,
 	      const struct intel_uncore_forcewake_domain *d)
@@ -88,17 +179,26 @@ fw_domain_get(struct drm_i915_private *i915,
 }
 
 static inline void
-fw_domain_wait_ack(const struct drm_i915_private *i915,
-		   const struct intel_uncore_forcewake_domain *d)
+fw_domain_wait_ack_set(const struct drm_i915_private *i915,
+		       const struct intel_uncore_forcewake_domain *d)
 {
-	if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
-			     FORCEWAKE_KERNEL),
-			    FORCEWAKE_ACK_TIMEOUT_MS))
+	if (wait_ack_set(i915, d, FORCEWAKE_KERNEL))
 		DRM_ERROR("%s: timed out waiting for forcewake ack request.\n",
 			  intel_uncore_forcewake_domain_to_str(d->id));
 }
 
 static inline void
+fw_domain_wait_ack_set_fallback(const struct drm_i915_private *i915,
+				const struct intel_uncore_forcewake_domain *d)
+{
+	if (likely(!wait_ack_set(i915, d, FORCEWAKE_KERNEL)))
+		return;
+
+	if (fw_domain_wait_ack_with_fallback(i915, d, ACK_SET))
+		fw_domain_wait_ack_set(i915, d);
+}
+
+static inline void
 fw_domain_put(const struct drm_i915_private *i915,
 	      const struct intel_uncore_forcewake_domain *d)
 {
@@ -119,7 +219,27 @@ fw_domains_get(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
 	}
 
 	for_each_fw_domain_masked(d, fw_domains, i915, tmp)
-		fw_domain_wait_ack(i915, d);
+		fw_domain_wait_ack_set(i915, d);
+
+	i915->uncore.fw_domains_active |= fw_domains;
+}
+
+static void
+fw_domains_get_with_fallback(struct drm_i915_private *i915,
+			     enum forcewake_domains fw_domains)
+{
+	struct intel_uncore_forcewake_domain *d;
+	unsigned int tmp;
+
+	GEM_BUG_ON(fw_domains & ~i915->uncore.fw_domains);
+
+	for_each_fw_domain_masked(d, fw_domains, i915, tmp) {
+		fw_domain_wait_ack_clear_fallback(i915, d);
+		fw_domain_get(i915, d);
+	}
+
+	for_each_fw_domain_masked(d, fw_domains, i915, tmp)
+		fw_domain_wait_ack_set_fallback(i915, d);
 
 	i915->uncore.fw_domains_active |= fw_domains;
 }
@@ -1142,7 +1262,8 @@ static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv)
 	}
 
 	if (INTEL_GEN(dev_priv) >= 9) {
-		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,
-- 
2.11.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx