[PATCH v3 10/12] drm/i915/guc: Add client support to enable/disable GuC interrupts

From: Sagar Arun Kamble <sagar.a.kamble@intel.com>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH v3 10/12] drm/i915/guc: Add client support to enable/disable GuC interrupts
Date: Thu,  4 Jan 2018 21:51:52 +0530	[thread overview]
Message-ID: <1515082914-4111-11-git-send-email-sagar.a.kamble@intel.com> (raw)
In-Reply-To: <1515082914-4111-1-git-send-email-sagar.a.kamble@intel.com>

This patch adds support to enable/disable GuC interrupts for different
features without impacting other's need. Currently GuC log capture and
CT buffer receive mechanisms use the GuC interrupts. GuC interrupts are
currently enabled and disabled in different logging scenarios all gated
by log level.

v2: Rebase with all GuC interrupt handlers moved to intel_guc.c. Handling
multiple clients for GuC interrupts enable/disable.
(Michal Wajdeczko)

v3: Removed spin lock and using test_bit in i915_guc_info. Prepared low
level helpers to get/put GuC interrupts that can be reused during
suspend/resume. (Tvrtko)

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c  |  6 +++++
 drivers/gpu/drm/i915/intel_guc.c     | 47 +++++++++++++++++++++++++++---------
 drivers/gpu/drm/i915/intel_guc.h     | 11 ++++++---
 drivers/gpu/drm/i915/intel_guc_log.c |  6 ++---
 drivers/gpu/drm/i915/intel_uc.c      |  4 +--
 5 files changed, 54 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 16f9a95..eef4c8b 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2340,6 +2340,12 @@ static int i915_guc_info(struct seq_file *m, void *data)
 	GEM_BUG_ON(!guc->execbuf_client);
 	GEM_BUG_ON(!guc->preempt_client);
 
+	seq_puts(m, "GuC Interrupt Clients: ");
+	if (test_bit(GUC_INTR_CLIENT_LOG, &guc->interrupt_clients))
+		seq_puts(m, "GuC Logging\n");
+	else
+		seq_puts(m, "None\n");
+
 	seq_printf(m, "Doorbell map:\n");
 	seq_printf(m, "\t%*pb\n", GUC_NUM_DOORBELLS, guc->doorbell_bitmap);
 	seq_printf(m, "Doorbell next cacheline: 0x%x\n\n", guc->db_cacheline);
diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index 36d1bca..d356c40 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -407,7 +407,7 @@ int intel_guc_suspend(struct drm_i915_private *dev_priv)
 		return 0;
 
 	if (guc->log.level >= 0)
-		intel_disable_guc_interrupts(guc);
+		intel_put_guc_interrupts(guc, GUC_INTR_CLIENT_LOG);
 
 	data[0] = INTEL_GUC_ACTION_ENTER_S_STATE;
 	/* any value greater than GUC_POWER_D0 */
@@ -453,7 +453,7 @@ int intel_guc_resume(struct drm_i915_private *dev_priv)
 		return 0;
 
 	if (guc->log.level >= 0)
-		intel_enable_guc_interrupts(guc);
+		intel_get_guc_interrupts(guc, GUC_INTR_CLIENT_LOG);
 
 	data[0] = INTEL_GUC_ACTION_EXIT_S_STATE;
 	data[1] = GUC_POWER_D0;
@@ -524,28 +524,51 @@ void intel_reset_guc_interrupts(struct intel_guc *guc)
 	spin_unlock_irq(&dev_priv->irq_lock);
 }
 
-void intel_enable_guc_interrupts(struct intel_guc *guc)
+static void __intel_get_guc_interrupts(struct intel_guc *guc)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+
+	lockdep_assert_held(&dev_priv->irq_lock);
+
+	WARN_ON_ONCE(I915_READ(gen6_pm_iir(dev_priv)) &
+			       dev_priv->pm_guc_events);
+	gen6_enable_pm_irq(dev_priv, dev_priv->pm_guc_events);
+}
+
+void intel_get_guc_interrupts(struct intel_guc *guc, enum guc_intr_client id)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 
 	spin_lock_irq(&dev_priv->irq_lock);
-	if (!dev_priv->guc.interrupts_enabled) {
-		WARN_ON_ONCE(I915_READ(gen6_pm_iir(dev_priv)) &
-				       dev_priv->pm_guc_events);
-		dev_priv->guc.interrupts_enabled = true;
-		gen6_enable_pm_irq(dev_priv, dev_priv->pm_guc_events);
-	}
+
+	if (!guc->interrupt_clients)
+		__intel_get_guc_interrupts(guc);
+	__set_bit(id, &guc->interrupt_clients);
+
 	spin_unlock_irq(&dev_priv->irq_lock);
 }
 
-void intel_disable_guc_interrupts(struct intel_guc *guc)
+static void __intel_put_guc_interrupts(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 
-	spin_lock_irq(&dev_priv->irq_lock);
-	dev_priv->guc.interrupts_enabled = false;
+	lockdep_assert_held(&dev_priv->irq_lock);
 
 	gen6_disable_pm_irq(dev_priv, dev_priv->pm_guc_events);
+}
+
+void intel_put_guc_interrupts(struct intel_guc *guc, enum guc_intr_client id)
+{
+	struct drm_i915_private *dev_priv = guc_to_i915(guc);
+
+	spin_lock_irq(&dev_priv->irq_lock);
+
+	__clear_bit(id, &guc->interrupt_clients);
+	if (guc->interrupt_clients) {
+		spin_unlock_irq(&dev_priv->irq_lock);
+		return;
+	}
+	__intel_put_guc_interrupts(guc);
 
 	spin_unlock_irq(&dev_priv->irq_lock);
 	synchronize_irq(dev_priv->drm.irq);
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 49f33b9..af74392 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -34,6 +34,11 @@
 #include "intel_uc_fw.h"
 #include "i915_vma.h"
 
+enum guc_intr_client {
+	GUC_INTR_CLIENT_LOG = 0,
+	GUC_INTR_CLIENT_COUNT
+};
+
 struct guc_preempt_work {
 	struct work_struct work;
 	struct intel_engine_cs *engine;
@@ -53,7 +58,7 @@ struct intel_guc {
 	struct drm_i915_gem_object *load_err_log;
 
 	/* intel_guc_recv interrupt related state */
-	bool interrupts_enabled;
+	unsigned long interrupt_clients;
 
 	struct i915_vma *ads_vma;
 	struct i915_vma *stage_desc_pool;
@@ -132,8 +137,8 @@ static inline u32 guc_ggtt_offset(struct i915_vma *vma)
 struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size);
 u32 intel_guc_wopcm_size(struct drm_i915_private *dev_priv);
 void intel_reset_guc_interrupts(struct intel_guc *guc);
-void intel_enable_guc_interrupts(struct intel_guc *guc);
-void intel_disable_guc_interrupts(struct intel_guc *guc);
+void intel_get_guc_interrupts(struct intel_guc *guc, enum guc_intr_client id);
+void intel_put_guc_interrupts(struct intel_guc *guc, enum guc_intr_client id);
 void intel_guc_irq_handler(struct intel_guc *guc, u32 pm_iir);
 
 #endif
diff --git a/drivers/gpu/drm/i915/intel_guc_log.c b/drivers/gpu/drm/i915/intel_guc_log.c
index 7bc0065..ddd4f6d 100644
--- a/drivers/gpu/drm/i915/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/intel_guc_log.c
@@ -488,7 +488,7 @@ static void guc_flush_logs(struct intel_guc *guc)
 		return;
 
 	/* First disable the interrupts, will be renabled afterwards */
-	intel_disable_guc_interrupts(guc);
+	intel_put_guc_interrupts(guc, GUC_INTR_CLIENT_LOG);
 
 	/* Before initiating the forceful flush, wait for any pending/ongoing
 	 * flush to complete otherwise forceful flush may not actually happen.
@@ -594,7 +594,7 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
 		}
 
 		/* GuC logging is currently the only user of Guc2Host interrupts */
-		intel_enable_guc_interrupts(guc);
+		intel_get_guc_interrupts(guc, GUC_INTR_CLIENT_LOG);
 	} else {
 		/* Once logging is disabled, GuC won't generate logs & send an
 		 * interrupt. But there could be some data in the log buffer
@@ -626,7 +626,7 @@ void i915_guc_log_unregister(struct drm_i915_private *dev_priv)
 	/* GuC logging is currently the only user of Guc2Host interrupts */
 	if (dev_priv->guc.log.level >= 0) {
 		intel_runtime_pm_get(dev_priv);
-		intel_disable_guc_interrupts(&dev_priv->guc);
+		intel_put_guc_interrupts(&dev_priv->guc, GUC_INTR_CLIENT_LOG);
 		intel_runtime_pm_put(dev_priv);
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index fb5edcc..93ecbf1 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -319,7 +319,7 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
 		goto err_log_capture;
 
 	if (guc->log.level >= 0)
-		intel_enable_guc_interrupts(guc);
+		intel_get_guc_interrupts(guc, GUC_INTR_CLIENT_LOG);
 
 	ret = guc_enable_communication(guc);
 	if (ret)
@@ -353,7 +353,7 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
 	guc_disable_communication(guc);
 err_interrupts:
 	if (guc->log.level >= 0)
-		intel_disable_guc_interrupts(guc);
+		intel_put_guc_interrupts(guc, GUC_INTR_CLIENT_LOG);
 err_log_capture:
 	guc_capture_load_err_log(guc);
 err_out:
-- 
1.9.1

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