As the request is only valid during the same global reset epoch, we can
record the current reset_counter when constructing the request and reuse
it when waiting upon that request in future. This removes a very hairy
atomic check serialised by the struct_mutex at the time of waiting and
allows us to transfer those waits to a central dispatcher for all
waiters and all requests.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 +-
drivers/gpu/drm/i915/i915_gem.c | 40 +++++++++++----------------------
drivers/gpu/drm/i915/intel_display.c | 7 +-----
drivers/gpu/drm/i915/intel_lrc.c | 7 ------
drivers/gpu/drm/i915/intel_ringbuffer.c | 6 -----
5 files changed, 15 insertions(+), 47 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2a4cfa06c28d..ee7677343056 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2181,6 +2181,7 @@ struct drm_i915_gem_request {
/** On Which ring this request was generated */
struct drm_i915_private *i915;
struct intel_engine_cs *ring;
+ unsigned reset_counter;
/** GEM sequence number associated with the previous request,
* when the HWS breadcrumb is equal to this the GPU is processing
@@ -3049,7 +3050,6 @@ void __i915_add_request(struct drm_i915_gem_request *req,
#define i915_add_request_no_flush(req) \
__i915_add_request(req, NULL, false)
int __i915_wait_request(struct drm_i915_gem_request *req,
- unsigned reset_counter,
bool interruptible,
s64 *timeout,
struct intel_rps_client *rps);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index bff245de8ade..68d4bab93fd8 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1223,7 +1223,6 @@ static int __i915_spin_request(struct drm_i915_gem_request *req, int state)
/**
* __i915_wait_request - wait until execution of request has finished
* @req: duh!
- * @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
*
@@ -1238,7 +1237,6 @@ static int __i915_spin_request(struct drm_i915_gem_request *req, int state)
* errno with remaining time filled in timeout argument.
*/
int __i915_wait_request(struct drm_i915_gem_request *req,
- unsigned reset_counter,
bool interruptible,
s64 *timeout,
struct intel_rps_client *rps)
@@ -1297,7 +1295,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
/* We need to check whether any gpu reset happened in between
* the caller grabbing the seqno and now ... */
- if (reset_counter != i915_reset_counter(&dev_priv->gpu_error)) {
+ if (req->reset_counter != i915_reset_counter(&dev_priv->gpu_error)) {
/* ... but upgrade the -EAGAIN to an -EIO if the gpu
* is truely gone. */
ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
@@ -1470,13 +1468,7 @@ i915_wait_request(struct drm_i915_gem_request *req)
BUG_ON(!mutex_is_locked(&dev->struct_mutex));
- ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
- if (ret)
- return ret;
-
- ret = __i915_wait_request(req,
- i915_reset_counter(&dev_priv->gpu_error),
- interruptible, NULL, NULL);
+ ret = __i915_wait_request(req, interruptible, NULL, NULL);
if (ret)
return ret;
@@ -1551,7 +1543,6 @@ i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
struct drm_device *dev = obj->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_request *requests[I915_NUM_RINGS];
- unsigned reset_counter;
int ret, i, n = 0;
BUG_ON(!mutex_is_locked(&dev->struct_mutex));
@@ -1560,12 +1551,6 @@ i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
if (!obj->active)
return 0;
- ret = i915_gem_check_wedge(&dev_priv->gpu_error, true);
- if (ret)
- return ret;
-
- reset_counter = i915_reset_counter(&dev_priv->gpu_error);
-
if (readonly) {
struct drm_i915_gem_request *req;
@@ -1587,9 +1572,9 @@ i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
}
mutex_unlock(&dev->struct_mutex);
+ ret = 0;
for (i = 0; ret == 0 && i < n; i++)
- ret = __i915_wait_request(requests[i], reset_counter, true,
- NULL, rps);
+ ret = __i915_wait_request(requests[i], true, NULL, rps);
mutex_lock(&dev->struct_mutex);
for (i = 0; i < n; i++) {
@@ -2693,6 +2678,7 @@ int i915_gem_request_alloc(struct intel_engine_cs *ring,
struct drm_i915_gem_request **req_out)
{
struct drm_i915_private *dev_priv = to_i915(ring->dev);
+ unsigned reset_counter = i915_reset_counter(&dev_priv->gpu_error);
struct drm_i915_gem_request *req;
int ret;
@@ -2701,6 +2687,11 @@ int i915_gem_request_alloc(struct intel_engine_cs *ring,
*req_out = NULL;
+ ret = i915_gem_check_wedge(&dev_priv->gpu_error,
+ dev_priv->mm.interruptible);
+ if (ret)
+ return ret;
+
req = kmem_cache_zalloc(dev_priv->requests, GFP_KERNEL);
if (req == NULL)
return -ENOMEM;
@@ -2712,6 +2703,7 @@ int i915_gem_request_alloc(struct intel_engine_cs *ring,
kref_init(&req->ref);
req->i915 = dev_priv;
req->ring = ring;
+ req->reset_counter = reset_counter;
req->ctx = ctx;
i915_gem_context_reference(req->ctx);
@@ -3072,11 +3064,9 @@ retire:
int
i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
{
- struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_wait *args = data;
struct drm_i915_gem_object *obj;
struct drm_i915_gem_request *req[I915_NUM_RINGS];
- unsigned reset_counter;
int i, n = 0;
int ret;
@@ -3110,7 +3100,6 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
}
drm_gem_object_unreference(&obj->base);
- reset_counter = i915_reset_counter(&dev_priv->gpu_error);
for (i = 0; i < I915_NUM_RINGS; i++) {
if (obj->last_read_req[i] == NULL)
@@ -3123,7 +3112,7 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
for (i = 0; i < n; i++) {
if (ret == 0)
- ret = __i915_wait_request(req[i], reset_counter, true,
+ ret = __i915_wait_request(req[i], true,
args->timeout_ns > 0 ? &args->timeout_ns : NULL,
file->driver_priv);
i915_gem_request_unreference__unlocked(req[i]);
@@ -3155,7 +3144,6 @@ __i915_gem_object_sync(struct drm_i915_gem_object *obj,
if (!i915_semaphore_is_enabled(obj->base.dev)) {
struct drm_i915_private *i915 = to_i915(obj->base.dev);
ret = __i915_wait_request(from_req,
- i915_reset_counter(&i915->gpu_error),
i915->mm.interruptible,
NULL,
&i915->rps.semaphores);
@@ -4084,7 +4072,6 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
struct drm_i915_file_private *file_priv = file->driver_priv;
unsigned long recent_enough = jiffies - DRM_I915_THROTTLE_JIFFIES;
struct drm_i915_gem_request *request, *target = NULL;
- unsigned reset_counter;
int ret;
ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
@@ -4109,7 +4096,6 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
target = request;
}
- reset_counter = i915_reset_counter(&dev_priv->gpu_error);
if (target)
i915_gem_request_reference(target);
spin_unlock(&file_priv->mm.lock);
@@ -4117,7 +4103,7 @@ 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, true, NULL, NULL);
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 511ead08ccd8..4447e73b54db 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11313,7 +11313,6 @@ static void intel_mmio_flip_work_func(struct work_struct *work)
if (mmio_flip->req) {
WARN_ON(__i915_wait_request(mmio_flip->req,
- mmio_flip->crtc->reset_counter,
false, NULL,
&mmio_flip->i915->rps.mmioflips));
i915_gem_request_unreference__unlocked(mmio_flip->req);
@@ -13305,9 +13304,6 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
ret = drm_atomic_helper_prepare_planes(dev, state);
if (!ret && !async && !i915_reset_in_progress(&dev_priv->gpu_error)) {
- u32 reset_counter;
-
- reset_counter = i915_reset_counter(&dev_priv->gpu_error);
mutex_unlock(&dev->struct_mutex);
for_each_plane_in_state(state, plane, plane_state, i) {
@@ -13318,8 +13314,7 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
continue;
ret = __i915_wait_request(intel_plane_state->wait_req,
- reset_counter, true,
- NULL, NULL);
+ true, NULL, NULL);
/* Swallow -EIO errors to allow updates during hw lockup. */
if (ret == -EIO)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 4ebafab53f30..fe71c768dbc4 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -819,16 +819,9 @@ static int logical_ring_prepare(struct drm_i915_gem_request *req, int bytes)
*/
int intel_logical_ring_begin(struct drm_i915_gem_request *req, int num_dwords)
{
- struct drm_i915_private *dev_priv;
int ret;
WARN_ON(req == NULL);
- dev_priv = req->ring->dev->dev_private;
-
- ret = i915_gem_check_wedge(&dev_priv->gpu_error,
- dev_priv->mm.interruptible);
- if (ret)
- return ret;
ret = logical_ring_prepare(req, num_dwords * sizeof(uint32_t));
if (ret)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8970267d27bb..913526c0264f 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2286,7 +2286,6 @@ int intel_ring_idle(struct intel_engine_cs *ring)
/* Make sure we do not trigger any retires */
return __i915_wait_request(req,
- i915_reset_counter(&to_i915(ring->dev)->gpu_error),
to_i915(ring->dev)->mm.interruptible,
NULL, NULL);
}
@@ -2417,11 +2416,6 @@ int intel_ring_begin(struct drm_i915_gem_request *req,
ring = req->ring;
dev_priv = ring->dev->dev_private;
- ret = i915_gem_check_wedge(&dev_priv->gpu_error,
- dev_priv->mm.interruptible);
- if (ret)
- return ret;
-
ret = __intel_ring_prepare(ring, num_dwords * sizeof(uint32_t));
if (ret)
return ret;
--
2.6.2
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