[RFC 1/4] drm/i915: split out uncore_mmio_debug

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Multiple uncore structures will share the debug infrastructure, so
move it to a common place and add extra locking around it.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.c     |  1 +
 drivers/gpu/drm/i915/i915_drv.h     |  1 +
 drivers/gpu/drm/i915/intel_uncore.c | 54 +++++++++++++++++++++--------
 drivers/gpu/drm/i915/intel_uncore.h |  9 ++++-
 4 files changed, 50 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e1817f89f5d5..1c4cfdb04867 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -901,6 +901,7 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv)
 
 	intel_device_info_subplatform_init(dev_priv);
 
+	intel_uncore_mmio_debug_init_early(&dev_priv->mmio_debug);
 	intel_uncore_init_early(&dev_priv->uncore, dev_priv);
 
 	spin_lock_init(&dev_priv->irq_lock);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 62e7c5e8aee5..a53b65d78159 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1341,6 +1341,7 @@ struct drm_i915_private {
 	resource_size_t stolen_usable_size;	/* Total size minus reserved ranges */
 
 	struct intel_uncore uncore;
+	struct intel_uncore_mmio_debug mmio_debug;
 
 	struct i915_virtual_gpu vgpu;
 
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 68d54e126d79..f2dfaccd6614 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -34,6 +34,13 @@
 
 #define __raw_posting_read(...) ((void)__raw_uncore_read32(__VA_ARGS__))
 
+void
+intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug)
+{
+	spin_lock_init(&mmio_debug->lock);
+	mmio_debug->unclaimed_mmio_check = 1;
+}
+
 static const char * const forcewake_domain_names[] = {
 	"render",
 	"blitter",
@@ -473,6 +480,8 @@ check_for_unclaimed_mmio(struct intel_uncore *uncore)
 {
 	bool ret = false;
 
+	lockdep_assert_held(&uncore->debug->lock);
+
 	if (intel_uncore_has_fpga_dbg_unclaimed(uncore))
 		ret |= fpga_check_for_unclaimed_mmio(uncore);
 
@@ -605,18 +614,20 @@ void intel_uncore_forcewake_get(struct intel_uncore *uncore,
 void intel_uncore_forcewake_user_get(struct intel_uncore *uncore)
 {
 	spin_lock_irq(&uncore->lock);
+	spin_lock(&uncore->debug->lock);
 	if (!uncore->user_forcewake.count++) {
 		intel_uncore_forcewake_get__locked(uncore, FORCEWAKE_ALL);
 
 		/* Save and disable mmio debugging for the user bypass */
 		uncore->user_forcewake.saved_mmio_check =
-			uncore->unclaimed_mmio_check;
+			uncore->debug->unclaimed_mmio_check;
 		uncore->user_forcewake.saved_mmio_debug =
 			i915_modparams.mmio_debug;
 
-		uncore->unclaimed_mmio_check = 0;
+		uncore->debug->unclaimed_mmio_check = 0;
 		i915_modparams.mmio_debug = 0;
 	}
+	spin_unlock(&uncore->debug->lock);
 	spin_unlock_irq(&uncore->lock);
 }
 
@@ -630,18 +641,20 @@ void intel_uncore_forcewake_user_get(struct intel_uncore *uncore)
 void intel_uncore_forcewake_user_put(struct intel_uncore *uncore)
 {
 	spin_lock_irq(&uncore->lock);
+	spin_lock(&uncore->debug->lock);
 	if (!--uncore->user_forcewake.count) {
-		if (intel_uncore_unclaimed_mmio(uncore))
+		if (check_for_unclaimed_mmio(uncore))
 			dev_info(uncore->i915->drm.dev,
 				 "Invalid mmio detected during user access\n");
 
-		uncore->unclaimed_mmio_check =
+		uncore->debug->unclaimed_mmio_check =
 			uncore->user_forcewake.saved_mmio_check;
 		i915_modparams.mmio_debug =
 			uncore->user_forcewake.saved_mmio_debug;
 
 		intel_uncore_forcewake_put__locked(uncore, FORCEWAKE_ALL);
 	}
+	spin_unlock(&uncore->debug->lock);
 	spin_unlock_irq(&uncore->lock);
 }
 
@@ -1059,7 +1072,16 @@ unclaimed_reg_debug(struct intel_uncore *uncore,
 	if (likely(!i915_modparams.mmio_debug))
 		return;
 
+	/* interrupts are disabled and re-enabled around uncore->lock usage */
+	lockdep_assert_held(&uncore->lock);
+
+	if (before)
+		spin_lock(&uncore->debug->lock);
+
 	__unclaimed_reg_debug(uncore, reg, read, before);
+
+	if (!before)
+		spin_unlock(&uncore->debug->lock);
 }
 
 #define GEN2_READ_HEADER(x) \
@@ -1579,6 +1601,7 @@ void intel_uncore_init_early(struct intel_uncore *uncore,
 	spin_lock_init(&uncore->lock);
 	uncore->i915 = i915;
 	uncore->rpm = &i915->runtime_pm;
+	uncore->debug = &i915->mmio_debug;
 }
 
 static void uncore_raw_init(struct intel_uncore *uncore)
@@ -1604,7 +1627,6 @@ static int uncore_forcewake_init(struct intel_uncore *uncore)
 	ret = intel_uncore_fw_domains_init(uncore);
 	if (ret)
 		return ret;
-
 	forcewake_early_sanitize(uncore, 0);
 
 	if (IS_GEN_RANGE(i915, 6, 7)) {
@@ -1653,8 +1675,6 @@ int intel_uncore_init_mmio(struct intel_uncore *uncore)
 	if (INTEL_GEN(i915) > 5 && !intel_vgpu_active(i915))
 		uncore->flags |= UNCORE_HAS_FORCEWAKE;
 
-	uncore->unclaimed_mmio_check = 1;
-
 	if (!intel_uncore_has_forcewake(uncore)) {
 		uncore_raw_init(uncore);
 	} else {
@@ -1679,7 +1699,7 @@ int intel_uncore_init_mmio(struct intel_uncore *uncore)
 		uncore->flags |= UNCORE_HAS_FIFO;
 
 	/* clear out unclaimed reg detection bit */
-	if (check_for_unclaimed_mmio(uncore))
+	if (intel_uncore_unclaimed_mmio(uncore))
 		DRM_DEBUG("unclaimed mmio detected on uncore init, clearing\n");
 
 	return 0;
@@ -1924,7 +1944,13 @@ int __intel_wait_for_register(struct intel_uncore *uncore,
 
 bool intel_uncore_unclaimed_mmio(struct intel_uncore *uncore)
 {
-	return check_for_unclaimed_mmio(uncore);
+	bool ret;
+
+	spin_lock_irq(&uncore->debug->lock);
+	ret = check_for_unclaimed_mmio(uncore);
+	spin_unlock_irq(&uncore->debug->lock);
+
+	return ret;
 }
 
 bool
@@ -1932,24 +1958,24 @@ intel_uncore_arm_unclaimed_mmio_detection(struct intel_uncore *uncore)
 {
 	bool ret = false;
 
-	spin_lock_irq(&uncore->lock);
+	spin_lock_irq(&uncore->debug->lock);
 
-	if (unlikely(uncore->unclaimed_mmio_check <= 0))
+	if (unlikely(uncore->debug->unclaimed_mmio_check <= 0))
 		goto out;
 
-	if (unlikely(intel_uncore_unclaimed_mmio(uncore))) {
+	if (unlikely(check_for_unclaimed_mmio(uncore))) {
 		if (!i915_modparams.mmio_debug) {
 			DRM_DEBUG("Unclaimed register detected, "
 				  "enabling oneshot unclaimed register reporting. "
 				  "Please use i915.mmio_debug=N for more information.\n");
 			i915_modparams.mmio_debug++;
 		}
-		uncore->unclaimed_mmio_check--;
+		uncore->debug->unclaimed_mmio_check--;
 		ret = true;
 	}
 
 out:
-	spin_unlock_irq(&uncore->lock);
+	spin_unlock_irq(&uncore->debug->lock);
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/i915/intel_uncore.h b/drivers/gpu/drm/i915/intel_uncore.h
index 7108475d9b24..d1b12b3b8353 100644
--- a/drivers/gpu/drm/i915/intel_uncore.h
+++ b/drivers/gpu/drm/i915/intel_uncore.h
@@ -36,6 +36,11 @@ struct drm_i915_private;
 struct intel_runtime_pm;
 struct intel_uncore;
 
+struct intel_uncore_mmio_debug {
+	spinlock_t lock; /** lock is also taken in irq contexts. */
+	int unclaimed_mmio_check;
+};
+
 enum forcewake_domain_id {
 	FW_DOMAIN_ID_RENDER = 0,
 	FW_DOMAIN_ID_BLITTER,
@@ -143,7 +148,7 @@ struct intel_uncore {
 		int saved_mmio_debug;
 	} user_forcewake;
 
-	int unclaimed_mmio_check;
+	struct intel_uncore_mmio_debug *debug;
 };
 
 /* Iterate over initialised fw domains */
@@ -178,6 +183,8 @@ intel_uncore_has_fifo(const struct intel_uncore *uncore)
 	return uncore->flags & UNCORE_HAS_FIFO;
 }
 
+void
+intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug);
 void intel_uncore_init_early(struct intel_uncore *uncore,
 			     struct drm_i915_private *i915);
 int intel_uncore_init_mmio(struct intel_uncore *uncore);
-- 
2.20.1

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