[Intel-gfx] [PATCH 1/4] drm/i915: don't block resume on fb console resume v2

[Jesse Barnes]

The console lock can be contended, so rather than prevent other drivers
after us from being held up, queue the console suspend into the global
work queue that can happen anytime.  I've measured this to take around
200ms on my T420.  Combined with the ring freq/turbo change, we should
save almost 1/2 a second on resume.

v2: use console_trylock() to try to resume the console immediately (Chris)

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_dma.c |    3 +++
 drivers/gpu/drm/i915/i915_drv.c |   27 ++++++++++++++++++++++++---
 drivers/gpu/drm/i915/i915_drv.h |    7 +++++++
 3 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index d04facb..14526dc 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1329,6 +1329,8 @@ static int i915_load_modeset_init(struct drm_device *dev)
 
 	intel_modeset_gem_init(dev);
 
+	INIT_WORK(&dev_priv->console_resume_work, intel_console_resume);
+
 	ret = drm_irq_install(dev);
 	if (ret)
 		goto cleanup_gem;
@@ -1723,6 +1725,7 @@ int i915_driver_unload(struct drm_device *dev)
 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 		intel_fbdev_fini(dev);
 		intel_modeset_cleanup(dev);
+		cancel_work_sync(&dev_priv->console_resume_work);
 
 		/*
 		 * free the memory space allocated for the child device
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 4238853..bedf942 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -519,6 +519,18 @@ int i915_suspend(struct drm_device *dev, pm_message_t state)
 	return 0;
 }
 
+void intel_console_resume(struct work_struct *work)
+{
+	struct drm_i915_private *dev_priv =
+		container_of(work, struct drm_i915_private,
+			     console_resume_work);
+	struct drm_device *dev = dev_priv->dev;
+
+	console_lock();
+	intel_fbdev_set_suspend(dev, 0);
+	console_unlock();
+}
+
 static int i915_drm_thaw(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -555,9 +567,18 @@ static int i915_drm_thaw(struct drm_device *dev)
 
 	dev_priv->modeset_on_lid = 0;
 
-	console_lock();
-	intel_fbdev_set_suspend(dev, 0);
-	console_unlock();
+	/*
+	 * The console lock can be pretty contented on resume due
+	 * to all the printk activity.  Try to keep it out of the hot
+	 * path of resume if possible.
+	 */
+	if (console_trylock()) {
+		intel_fbdev_set_suspend(dev, 0);
+		console_unlock();
+	} else {
+		schedule_work(&dev_priv->console_resume_work);
+	}
+
 	return error;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a2c5e89..045963d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -455,6 +455,12 @@ typedef struct drm_i915_private {
 	u32 hotplug_supported_mask;
 	struct work_struct hotplug_work;
 
+	/*
+	 * The console may be contended at resume, but we don't
+	 * want it to block on it.
+	 */
+	struct work_struct console_resume_work;
+
 	int num_pipe;
 	int num_pch_pll;
 
@@ -1255,6 +1261,7 @@ extern unsigned long i915_mch_val(struct drm_i915_private *dev_priv);
 extern unsigned long i915_gfx_val(struct drm_i915_private *dev_priv);
 extern void i915_update_gfx_val(struct drm_i915_private *dev_priv);
 
+extern void intel_console_resume(struct work_struct *work);
 
 /* i915_irq.c */
 void i915_hangcheck_elapsed(unsigned long data);
-- 
1.7.9.5