[PATCH 15/20] drm/i915: Port of Added scheduler support to __wait_request() calls

[Arun Siluvery <arun.siluvery@linux.intel.com>]

From: Tomas Elf <tomas.elf@intel.com>

This is a partial port of the following patch from John Harrison's GPU
scheduler patch series: (patch sent to Intel-GFX with the subject line
"[Intel-gfx] [RFC 19/39] drm/i915: Added scheduler support to __wait_request()
calls" on Fri 17 July 2015)

	Author: John Harrison <John.C.Harrison@Intel.com>
	Date:   Thu Apr 10 10:48:55 2014 +0100
	Subject: drm/i915: Added scheduler support to __wait_request() calls

Removed all scheduler references and backported it to this baseline. The reason
we need this is because Chris Wilson has pointed out that threads that don't
hold the struct_mutex should not be thrown out of __i915_wait_request during
TDR hang recovery. Therefore we need a way to determine which threads are
holding the mutex and which are not.

Signed-off-by: Tomas Elf <tomas.elf@intel.com>
Signed-off-by: John Harrison <john.c.harrison@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |  3 ++-
 drivers/gpu/drm/i915/i915_gem.c         | 16 ++++++++++------
 drivers/gpu/drm/i915/intel_display.c    |  5 +++--
 drivers/gpu/drm/i915/intel_ringbuffer.c |  2 +-
 4 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a65722d..f1c56b3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3102,7 +3102,8 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 			unsigned reset_counter,
 			bool interruptible,
 			s64 *timeout,
-			struct intel_rps_client *rps);
+			struct intel_rps_client *rps,
+			bool is_locked);
 int __must_check i915_wait_request(struct drm_i915_gem_request *req);
 int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
 int __must_check
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e6eb45d..7122315 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1257,6 +1257,8 @@ static int __i915_spin_request(struct drm_i915_gem_request *req, int state)
  * @reset_counter: reset sequence associated with the given request
  * @interruptible: do an interruptible wait (normally yes)
  * @timeout: in - how long to wait (NULL forever); out - how much time remaining
+ * @rps: ...
+ * @is_locked: true = Caller is holding struct_mutex
  *
  * Note: It is of utmost importance that the passed in seqno and reset_counter
  * values have been read by the caller in an smp safe manner. Where read-side
@@ -1272,7 +1274,8 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 			unsigned reset_counter,
 			bool interruptible,
 			s64 *timeout,
-			struct intel_rps_client *rps)
+			struct intel_rps_client *rps,
+			bool is_locked)
 {
 	struct intel_engine_cs *ring = i915_gem_request_get_ring(req);
 	struct drm_device *dev = ring->dev;
@@ -1514,7 +1517,7 @@ i915_wait_request(struct drm_i915_gem_request *req)
 
 	ret = __i915_wait_request(req,
 				  atomic_read(&dev_priv->gpu_error.reset_counter),
-				  interruptible, NULL, NULL);
+				  interruptible, NULL, NULL, true);
 	if (ret)
 		return ret;
 
@@ -1627,7 +1630,7 @@ i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
 	mutex_unlock(&dev->struct_mutex);
 	for (i = 0; ret == 0 && i < n; i++)
 		ret = __i915_wait_request(requests[i], reset_counter, true,
-					  NULL, rps);
+					  NULL, rps, false);
 	mutex_lock(&dev->struct_mutex);
 
 	for (i = 0; i < n; i++) {
@@ -3160,7 +3163,7 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 		if (ret == 0)
 			ret = __i915_wait_request(req[i], reset_counter, true,
 						  args->timeout_ns > 0 ? &args->timeout_ns : NULL,
-						  to_rps_client(file));
+						  to_rps_client(file), false);
 		i915_gem_request_unreference__unlocked(req[i]);
 	}
 	return ret;
@@ -3193,7 +3196,8 @@ __i915_gem_object_sync(struct drm_i915_gem_object *obj,
 					  atomic_read(&i915->gpu_error.reset_counter),
 					  i915->mm.interruptible,
 					  NULL,
-					  &i915->rps.semaphores);
+					  &i915->rps.semaphores,
+					  true); /* Is the mutex always held by this thread at this point? */
 		if (ret)
 			return ret;
 
@@ -4172,7 +4176,7 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
 	if (target == NULL)
 		return 0;
 
-	ret = __i915_wait_request(target, reset_counter, true, NULL, NULL);
+	ret = __i915_wait_request(target, reset_counter, true, NULL, NULL, false);
 	if (ret == 0)
 		queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index abfb5ba..74e97d5 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11468,7 +11468,8 @@ static void intel_mmio_flip_work_func(struct work_struct *work)
 		WARN_ON(__i915_wait_request(mmio_flip->req,
 					    mmio_flip->crtc->reset_counter,
 					    false, NULL,
-					    &mmio_flip->i915->rps.mmioflips));
+					    &mmio_flip->i915->rps.mmioflips,
+					    false));
 		i915_gem_request_unreference__unlocked(mmio_flip->req);
 	}
 
@@ -13523,7 +13524,7 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
 
 			ret = __i915_wait_request(intel_plane_state->wait_req,
 						  reset_counter, true,
-						  NULL, NULL);
+						  NULL, NULL, false);
 
 			/* Swallow -EIO errors to allow updates during hw lockup. */
 			if (ret == -EIO)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f959326..ec1b85f 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2372,7 +2372,7 @@ int intel_ring_idle(struct intel_engine_cs *ring)
 	return __i915_wait_request(req,
 				   atomic_read(&to_i915(ring->dev)->gpu_error.reset_counter),
 				   to_i915(ring->dev)->mm.interruptible,
-				   NULL, NULL);
+				   NULL, NULL, true); /* Is the mutex always held by this thread at this point? */
 }
 
 int intel_ring_alloc_request_extras(struct drm_i915_gem_request *request)
-- 
1.9.1

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