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.harri...@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....@intel.com>
Signed-off-by: John Harrison <john.c.harri...@intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuopp...@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 | 3 ++-
drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +-
4 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5b54675..5b14d97 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3054,7 +3054,8 @@ 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 95569cc..e3a06aa 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1206,6 +1206,8 @@ static int __i915_spin_request(struct
drm_i915_gem_request *req)
* @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
@@ -1221,7 +1223,8 @@ 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;
@@ -1455,7 +1458,7 @@ 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;
@@ -1568,7 +1571,7 @@ 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++) {
@@ -3085,7 +3088,7 @@ 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,
- file->driver_priv);
+ file->driver_priv, false);
i915_gem_request_unreference__unlocked(req[i]);
}
return ret;
@@ -3118,7 +3121,8 @@ __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;
@@ -4077,7 +4081,7 @@ 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 1fc1d24..cf68483 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11198,7 +11198,8 @@ 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);
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 3756fbb..abd2972 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2368,7 +2368,7 @@ 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
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
