drm/i915: Remove the dedicated hangcheck workqueue

The queue only ever contains at most one item and has no special flags.
It is just a very simple wrapper around the system-wq - a complication
with no benefits.

v2: Use the system_long_wq as we may wish to capture the error state
after detecting the hang - which may take a bit of time.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1467390209-3576-3-git-send-email-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 8a26740..c9abf91 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1175,15 +1175,8 @@ static int i915_workqueues_init(struct drm_i915_private *dev_priv)
        if (dev_priv->hotplug.dp_wq == NULL)
                goto out_free_wq;
 
-       dev_priv->gpu_error.hangcheck_wq =
-               alloc_ordered_workqueue("i915-hangcheck", 0);
-       if (dev_priv->gpu_error.hangcheck_wq == NULL)
-               goto out_free_dp_wq;
-
        return 0;
 
-out_free_dp_wq:
-       destroy_workqueue(dev_priv->hotplug.dp_wq);
 out_free_wq:
        destroy_workqueue(dev_priv->wq);
 out_err:
@@ -1194,7 +1187,6 @@ out_err:
 
 static void i915_workqueues_cleanup(struct drm_i915_private *dev_priv)
 {
-       destroy_workqueue(dev_priv->gpu_error.hangcheck_wq);
        destroy_workqueue(dev_priv->hotplug.dp_wq);
        destroy_workqueue(dev_priv->wq);
 }

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 485ab11..f4aa727 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1374,7 +1374,6 @@ struct i915_gpu_error {
        /* Hang gpu twice in this window and your context gets banned */
 #define DRM_I915_CTX_BAN_PERIOD DIV_ROUND_UP(8*DRM_I915_HANGCHECK_PERIOD, 1000)
 
-       struct workqueue_struct *hangcheck_wq;
        struct delayed_work hangcheck_work;
 
        /* For reset and error_state handling. */

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 5614582..3ad4ef9 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -3249,7 +3249,7 @@ out:
 
 void i915_queue_hangcheck(struct drm_i915_private *dev_priv)
 {
-       struct i915_gpu_error *e = &dev_priv->gpu_error;
+       unsigned long delay;
 
        if (!i915.enable_hangcheck)
                return;
@@ -3259,8 +3259,9 @@ void i915_queue_hangcheck(struct drm_i915_private *dev_priv)
         * we will ignore a hung ring if a second ring is kept busy.
         */
 
-       queue_delayed_work(e->hangcheck_wq, &e->hangcheck_work,
-                          round_jiffies_up_relative(DRM_I915_HANGCHECK_JIFFIES));
+       delay = round_jiffies_up_relative(DRM_I915_HANGCHECK_JIFFIES);
+       queue_delayed_work(system_long_wq,
+                          &dev_priv->gpu_error.hangcheck_work, delay);
 }
 
 static void ibx_irq_reset(struct drm_device *dev)