#include <linux/pci.h>
#include <linux/dma-buf.h>
+#define RQ_BUG_ON(expr)
+
static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj);
static void
-i915_gem_object_retire(struct drm_i915_gem_object *obj);
-
+i915_gem_object_retire__write(struct drm_i915_gem_object *obj);
+static void
+i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring);
static void i915_gem_write_fence(struct drm_device *dev, int reg,
struct drm_i915_gem_object *obj);
static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
ret = i915_gem_object_wait_rendering(obj, true);
if (ret)
return ret;
-
- i915_gem_object_retire(obj);
}
ret = i915_gem_object_get_pages(obj);
ret = i915_gem_object_wait_rendering(obj, false);
if (ret)
return ret;
-
- i915_gem_object_retire(obj);
}
/* Same trick applies to invalidate partially written cachelines read
* before writing. */
WARN(!intel_irqs_enabled(dev_priv), "IRQs disabled");
+ if (list_empty(&req->list))
+ return 0;
+
if (i915_gem_request_completed(req, true))
return 0;
return ret;
}
+static inline void
+i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
+{
+ struct drm_i915_file_private *file_priv = request->file_priv;
+
+ if (!file_priv)
+ return;
+
+ spin_lock(&file_priv->mm.lock);
+ list_del(&request->client_list);
+ request->file_priv = NULL;
+ spin_unlock(&file_priv->mm.lock);
+}
+
+static void i915_gem_request_retire(struct drm_i915_gem_request *request)
+{
+ trace_i915_gem_request_retire(request);
+
+ /* We know the GPU must have read the request to have
+ * sent us the seqno + interrupt, so use the position
+ * of tail of the request to update the last known position
+ * of the GPU head.
+ *
+ * Note this requires that we are always called in request
+ * completion order.
+ */
+ request->ringbuf->last_retired_head = request->postfix;
+
+ list_del_init(&request->list);
+ i915_gem_request_remove_from_client(request);
+
+ put_pid(request->pid);
+
+ i915_gem_request_unreference(request);
+}
+
+static void
+__i915_gem_request_retire__upto(struct drm_i915_gem_request *req)
+{
+ struct intel_engine_cs *engine = req->ring;
+ struct drm_i915_gem_request *tmp;
+
+ lockdep_assert_held(&engine->dev->struct_mutex);
+
+ if (list_empty(&req->list))
+ return;
+
+ do {
+ tmp = list_first_entry(&engine->request_list,
+ typeof(*tmp), list);
+
+ i915_gem_request_retire(tmp);
+ } while (tmp != req);
+
+ WARN_ON(i915_verify_lists(engine->dev));
+}
+
/**
* Waits for a request to be signaled, and cleans up the
* request and object lists appropriately for that event.
struct drm_device *dev;
struct drm_i915_private *dev_priv;
bool interruptible;
- unsigned reset_counter;
int ret;
BUG_ON(req == NULL);
if (ret)
return ret;
- reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
- i915_gem_request_reference(req);
- ret = __i915_wait_request(req, reset_counter,
+ ret = __i915_wait_request(req,
+ atomic_read(&dev_priv->gpu_error.reset_counter),
interruptible, NULL, NULL);
- i915_gem_request_unreference(req);
- return ret;
-}
-
-static int
-i915_gem_object_wait_rendering__tail(struct drm_i915_gem_object *obj)
-{
- if (!obj->active)
- return 0;
-
- /* Manually manage the write flush as we may have not yet
- * retired the buffer.
- *
- * Note that the last_write_req is always the earlier of
- * the two (read/write) requests, so if we haved successfully waited,
- * we know we have passed the last write.
- */
- i915_gem_request_assign(&obj->last_write_req, NULL);
+ if (ret)
+ return ret;
+ __i915_gem_request_retire__upto(req);
return 0;
}
i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
bool readonly)
{
- struct drm_i915_gem_request *req;
- int ret;
+ int ret, i;
- req = readonly ? obj->last_write_req : obj->last_read_req;
- if (!req)
+ if (!obj->active)
return 0;
- ret = i915_wait_request(req);
- if (ret)
- return ret;
+ if (readonly) {
+ if (obj->last_write_req != NULL) {
+ ret = i915_wait_request(obj->last_write_req);
+ if (ret)
+ return ret;
+
+ i = obj->last_write_req->ring->id;
+ if (obj->last_read_req[i] == obj->last_write_req)
+ i915_gem_object_retire__read(obj, i);
+ else
+ i915_gem_object_retire__write(obj);
+ }
+ } else {
+ for (i = 0; i < I915_NUM_RINGS; i++) {
+ if (obj->last_read_req[i] == NULL)
+ continue;
+
+ ret = i915_wait_request(obj->last_read_req[i]);
+ if (ret)
+ return ret;
+
+ i915_gem_object_retire__read(obj, i);
+ }
+ RQ_BUG_ON(obj->active);
+ }
+
+ return 0;
+}
+
+static void
+i915_gem_object_retire_request(struct drm_i915_gem_object *obj,
+ struct drm_i915_gem_request *req)
+{
+ int ring = req->ring->id;
+
+ if (obj->last_read_req[ring] == req)
+ i915_gem_object_retire__read(obj, ring);
+ else if (obj->last_write_req == req)
+ i915_gem_object_retire__write(obj);
- return i915_gem_object_wait_rendering__tail(obj);
+ __i915_gem_request_retire__upto(req);
}
/* A nonblocking variant of the above wait. This is a highly dangerous routine
struct drm_i915_file_private *file_priv,
bool readonly)
{
- struct drm_i915_gem_request *req;
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;
+ int ret, i, n = 0;
BUG_ON(!mutex_is_locked(&dev->struct_mutex));
BUG_ON(!dev_priv->mm.interruptible);
- req = readonly ? obj->last_write_req : obj->last_read_req;
- if (!req)
+ if (!obj->active)
return 0;
ret = i915_gem_check_wedge(&dev_priv->gpu_error, true);
if (ret)
return ret;
- ret = i915_gem_check_olr(req);
- if (ret)
- return ret;
-
reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
- i915_gem_request_reference(req);
+
+ if (readonly) {
+ struct drm_i915_gem_request *req;
+
+ req = obj->last_write_req;
+ if (req == NULL)
+ return 0;
+
+ ret = i915_gem_check_olr(req);
+ if (ret)
+ goto err;
+
+ requests[n++] = i915_gem_request_reference(req);
+ } else {
+ for (i = 0; i < I915_NUM_RINGS; i++) {
+ struct drm_i915_gem_request *req;
+
+ req = obj->last_read_req[i];
+ if (req == NULL)
+ continue;
+
+ ret = i915_gem_check_olr(req);
+ if (ret)
+ goto err;
+
+ requests[n++] = i915_gem_request_reference(req);
+ }
+ }
+
mutex_unlock(&dev->struct_mutex);
- ret = __i915_wait_request(req, reset_counter, true, NULL, file_priv);
+ for (i = 0; ret == 0 && i < n; i++)
+ ret = __i915_wait_request(requests[i], reset_counter, true,
+ NULL, file_priv);
mutex_lock(&dev->struct_mutex);
- i915_gem_request_unreference(req);
- if (ret)
- return ret;
- return i915_gem_object_wait_rendering__tail(obj);
+err:
+ for (i = 0; i < n; i++) {
+ if (ret == 0)
+ i915_gem_object_retire_request(obj, requests[i]);
+ i915_gem_request_unreference(requests[i]);
+ }
+
+ return ret;
}
/**
return 0;
}
-static void
-i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
- struct intel_engine_cs *ring)
+void i915_vma_move_to_active(struct i915_vma *vma,
+ struct intel_engine_cs *ring)
{
- struct drm_i915_gem_request *req;
- struct intel_engine_cs *old_ring;
-
- BUG_ON(ring == NULL);
-
- req = intel_ring_get_request(ring);
- old_ring = i915_gem_request_get_ring(obj->last_read_req);
-
- if (old_ring != ring && obj->last_write_req) {
- /* Keep the request relative to the current ring */
- i915_gem_request_assign(&obj->last_write_req, req);
- }
+ struct drm_i915_gem_object *obj = vma->obj;
/* Add a reference if we're newly entering the active list. */
- if (!obj->active) {
+ if (obj->active == 0)
drm_gem_object_reference(&obj->base);
- obj->active = 1;
- }
+ obj->active |= intel_ring_flag(ring);
- list_move_tail(&obj->ring_list, &ring->active_list);
+ list_move_tail(&obj->ring_list[ring->id], &ring->active_list);
+ i915_gem_request_assign(&obj->last_read_req[ring->id],
+ intel_ring_get_request(ring));
- i915_gem_request_assign(&obj->last_read_req, req);
+ list_move_tail(&vma->mm_list, &vma->vm->active_list);
}
-void i915_vma_move_to_active(struct i915_vma *vma,
- struct intel_engine_cs *ring)
+static void
+i915_gem_object_retire__write(struct drm_i915_gem_object *obj)
{
- list_move_tail(&vma->mm_list, &vma->vm->active_list);
- return i915_gem_object_move_to_active(vma->obj, ring);
+ RQ_BUG_ON(obj->last_write_req == NULL);
+ RQ_BUG_ON(!(obj->active & intel_ring_flag(obj->last_write_req->ring)));
+
+ i915_gem_request_assign(&obj->last_write_req, NULL);
+ intel_fb_obj_flush(obj, true);
}
static void
-i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
+i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring)
{
struct i915_vma *vma;
- BUG_ON(obj->base.write_domain & ~I915_GEM_GPU_DOMAINS);
- BUG_ON(!obj->active);
+ RQ_BUG_ON(obj->last_read_req[ring] == NULL);
+ RQ_BUG_ON(!(obj->active & (1 << ring)));
+
+ list_del_init(&obj->ring_list[ring]);
+ i915_gem_request_assign(&obj->last_read_req[ring], NULL);
+
+ if (obj->last_write_req && obj->last_write_req->ring->id == ring)
+ i915_gem_object_retire__write(obj);
+
+ obj->active &= ~(1 << ring);
+ if (obj->active)
+ return;
list_for_each_entry(vma, &obj->vma_list, vma_link) {
if (!list_empty(&vma->mm_list))
list_move_tail(&vma->mm_list, &vma->vm->inactive_list);
}
- intel_fb_obj_flush(obj, true);
-
- list_del_init(&obj->ring_list);
-
- i915_gem_request_assign(&obj->last_read_req, NULL);
- i915_gem_request_assign(&obj->last_write_req, NULL);
- obj->base.write_domain = 0;
-
i915_gem_request_assign(&obj->last_fenced_req, NULL);
-
- obj->active = 0;
drm_gem_object_unreference(&obj->base);
-
- WARN_ON(i915_verify_lists(dev));
-}
-
-static void
-i915_gem_object_retire(struct drm_i915_gem_object *obj)
-{
- if (obj->last_read_req == NULL)
- return;
-
- if (i915_gem_request_completed(obj->last_read_req, true))
- i915_gem_object_move_to_inactive(obj);
}
static int
return 0;
}
-static inline void
-i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
-{
- struct drm_i915_file_private *file_priv = request->file_priv;
-
- if (!file_priv)
- return;
-
- spin_lock(&file_priv->mm.lock);
- list_del(&request->client_list);
- request->file_priv = NULL;
- spin_unlock(&file_priv->mm.lock);
-}
-
static bool i915_context_is_banned(struct drm_i915_private *dev_priv,
const struct intel_context *ctx)
{
}
}
-static void i915_gem_free_request(struct drm_i915_gem_request *request)
-{
- list_del(&request->list);
- i915_gem_request_remove_from_client(request);
-
- put_pid(request->pid);
-
- i915_gem_request_unreference(request);
-}
-
void i915_gem_request_free(struct kref *req_ref)
{
struct drm_i915_gem_request *req = container_of(req_ref,
obj = list_first_entry(&ring->active_list,
struct drm_i915_gem_object,
- ring_list);
+ ring_list[ring->id]);
- i915_gem_object_move_to_inactive(obj);
+ i915_gem_object_retire__read(obj, ring->id);
}
/*
struct drm_i915_gem_request,
list);
- i915_gem_free_request(request);
+ i915_gem_request_retire(request);
}
/* This may not have been flushed before the reset, so clean it now */
i915_gem_context_reset(dev);
i915_gem_restore_fences(dev);
+
+ WARN_ON(i915_verify_lists(dev));
}
/**
void
i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
{
- if (list_empty(&ring->request_list))
- return;
-
WARN_ON(i915_verify_lists(ring->dev));
+ if (list_empty(&ring->active_list))
+ return;
+
/* Retire requests first as we use it above for the early return.
* If we retire requests last, we may use a later seqno and so clear
* the requests lists without clearing the active list, leading to
if (!i915_gem_request_completed(request, true))
break;
- trace_i915_gem_request_retire(request);
-
- /* We know the GPU must have read the request to have
- * sent us the seqno + interrupt, so use the position
- * of tail of the request to update the last known position
- * of the GPU head.
- */
- request->ringbuf->last_retired_head = request->postfix;
-
- i915_gem_free_request(request);
+ i915_gem_request_retire(request);
}
/* Move any buffers on the active list that are no longer referenced
obj = list_first_entry(&ring->active_list,
struct drm_i915_gem_object,
- ring_list);
+ ring_list[ring->id]);
- if (!i915_gem_request_completed(obj->last_read_req, true))
+ if (!list_empty(&obj->last_read_req[ring->id]->list))
break;
- i915_gem_object_move_to_inactive(obj);
+ i915_gem_object_retire__read(obj, ring->id);
}
if (unlikely(ring->trace_irq_req &&
static int
i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
{
- struct intel_engine_cs *ring;
- int ret;
+ int ret, i;
+
+ if (!obj->active)
+ return 0;
- if (obj->active) {
- ring = i915_gem_request_get_ring(obj->last_read_req);
+ for (i = 0; i < I915_NUM_RINGS; i++) {
+ struct drm_i915_gem_request *req;
- ret = i915_gem_check_olr(obj->last_read_req);
+ req = obj->last_read_req[i];
+ if (req == NULL)
+ continue;
+
+ if (list_empty(&req->list))
+ goto retire;
+
+ ret = i915_gem_check_olr(req);
if (ret)
return ret;
- i915_gem_retire_requests_ring(ring);
+ if (i915_gem_request_completed(req, true)) {
+ __i915_gem_request_retire__upto(req);
+retire:
+ i915_gem_object_retire__read(obj, i);
+ }
}
return 0;
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;
+ struct drm_i915_gem_request *req[I915_NUM_RINGS];
unsigned reset_counter;
- int ret = 0;
+ int i, n = 0;
+ int ret;
if (args->flags != 0)
return -EINVAL;
if (ret)
goto out;
- if (!obj->active || !obj->last_read_req)
+ if (!obj->active)
goto out;
- req = obj->last_read_req;
-
/* Do this after OLR check to make sure we make forward progress polling
* on this IOCTL with a timeout == 0 (like busy ioctl)
*/
drm_gem_object_unreference(&obj->base);
reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
- i915_gem_request_reference(req);
+
+ for (i = 0; i < I915_NUM_RINGS; i++) {
+ if (obj->last_read_req[i] == NULL)
+ continue;
+
+ req[n++] = i915_gem_request_reference(obj->last_read_req[i]);
+ }
+
mutex_unlock(&dev->struct_mutex);
- ret = __i915_wait_request(req, reset_counter, true,
- args->timeout_ns > 0 ? &args->timeout_ns : NULL,
- file->driver_priv);
- i915_gem_request_unreference__unlocked(req);
+ for (i = 0; i < n; i++) {
+ if (ret == 0)
+ ret = __i915_wait_request(req[i], reset_counter, true,
+ args->timeout_ns > 0 ? &args->timeout_ns : NULL,
+ file->driver_priv);
+ i915_gem_request_unreference__unlocked(req[i]);
+ }
return ret;
out:
return ret;
}
+static int
+__i915_gem_object_sync(struct drm_i915_gem_object *obj,
+ struct intel_engine_cs *to,
+ struct drm_i915_gem_request *req)
+{
+ struct intel_engine_cs *from;
+ int ret;
+
+ from = i915_gem_request_get_ring(req);
+ if (to == from)
+ return 0;
+
+ if (i915_gem_request_completed(req, true))
+ return 0;
+
+ ret = i915_gem_check_olr(req);
+ if (ret)
+ return ret;
+
+ if (!i915_semaphore_is_enabled(obj->base.dev)) {
+ ret = __i915_wait_request(req,
+ atomic_read(&to_i915(obj->base.dev)->gpu_error.reset_counter),
+ to_i915(obj->base.dev)->mm.interruptible, NULL, NULL);
+ if (ret)
+ return ret;
+
+ i915_gem_object_retire_request(obj, req);
+ } else {
+ int idx = intel_ring_sync_index(from, to);
+ u32 seqno = i915_gem_request_get_seqno(req);
+
+ if (seqno <= from->semaphore.sync_seqno[idx])
+ return 0;
+
+ trace_i915_gem_ring_sync_to(from, to, req);
+ ret = to->semaphore.sync_to(to, from, seqno);
+ if (ret)
+ return ret;
+
+ /* We use last_read_req because sync_to()
+ * might have just caused seqno wrap under
+ * the radar.
+ */
+ from->semaphore.sync_seqno[idx] =
+ i915_gem_request_get_seqno(obj->last_read_req[from->id]);
+ }
+
+ return 0;
+}
+
/**
* i915_gem_object_sync - sync an object to a ring.
*
*
* This code is meant to abstract object synchronization with the GPU.
* Calling with NULL implies synchronizing the object with the CPU
- * rather than a particular GPU ring.
+ * rather than a particular GPU ring. Conceptually we serialise writes
+ * between engines inside the GPU. We only allow on engine to write
+ * into a buffer at any time, but multiple readers. To ensure each has
+ * a coherent view of memory, we must:
+ *
+ * - If there is an outstanding write request to the object, the new
+ * request must wait for it to complete (either CPU or in hw, requests
+ * on the same ring will be naturally ordered).
+ *
+ * - If we are a write request (pending_write_domain is set), the new
+ * request must wait for outstanding read requests to complete.
*
* Returns 0 if successful, else propagates up the lower layer error.
*/
i915_gem_object_sync(struct drm_i915_gem_object *obj,
struct intel_engine_cs *to)
{
- struct intel_engine_cs *from;
- u32 seqno;
- int ret, idx;
+ const bool readonly = obj->base.pending_write_domain == 0;
+ struct drm_i915_gem_request *req[I915_NUM_RINGS];
+ int ret, i, n;
- from = i915_gem_request_get_ring(obj->last_read_req);
-
- if (from == NULL || to == from)
- return 0;
-
- if (to == NULL || !i915_semaphore_is_enabled(obj->base.dev))
- return i915_gem_object_wait_rendering(obj, false);
-
- idx = intel_ring_sync_index(from, to);
-
- seqno = i915_gem_request_get_seqno(obj->last_read_req);
- /* Optimization: Avoid semaphore sync when we are sure we already
- * waited for an object with higher seqno */
- if (seqno <= from->semaphore.sync_seqno[idx])
+ if (!obj->active)
return 0;
- ret = i915_gem_check_olr(obj->last_read_req);
- if (ret)
- return ret;
+ if (to == NULL)
+ return i915_gem_object_wait_rendering(obj, readonly);
- trace_i915_gem_ring_sync_to(from, to, obj->last_read_req);
- ret = to->semaphore.sync_to(to, from, seqno);
- if (!ret)
- /* We use last_read_req because sync_to()
- * might have just caused seqno wrap under
- * the radar.
- */
- from->semaphore.sync_seqno[idx] =
- i915_gem_request_get_seqno(obj->last_read_req);
+ n = 0;
+ if (readonly) {
+ if (obj->last_write_req)
+ req[n++] = obj->last_write_req;
+ } else {
+ for (i = 0; i < I915_NUM_RINGS; i++)
+ if (obj->last_read_req[i])
+ req[n++] = obj->last_read_req[i];
+ }
+ for (i = 0; i < n; i++) {
+ ret = __i915_gem_object_sync(obj, to, req[i]);
+ if (ret)
+ return ret;
+ }
- return ret;
+ return 0;
}
static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
/* Since the unbound list is global, only move to that list if
* no more VMAs exist. */
if (list_empty(&obj->vma_list)) {
- /* Throw away the active reference before
- * moving to the unbound list. */
- i915_gem_object_retire(obj);
-
i915_gem_gtt_finish_object(obj);
list_move_tail(&obj->global_list, &dev_priv->mm.unbound_list);
}
return ret;
}
+ WARN_ON(i915_verify_lists(dev));
return 0;
}
if (ret)
return ret;
- i915_gem_object_retire(obj);
-
/* Flush and acquire obj->pages so that we are coherent through
* direct access in memory with previous cached writes through
* shmemfs and that our cache domain tracking remains valid.
u32 old_read_domains, old_write_domain;
int ret;
- if (pipelined != i915_gem_request_get_ring(obj->last_read_req)) {
- ret = i915_gem_object_sync(obj, pipelined);
- if (ret)
- return ret;
- }
+ ret = i915_gem_object_sync(obj, pipelined);
+ if (ret)
+ return ret;
/* Mark the pin_display early so that we account for the
* display coherency whilst setting up the cache domains.
if (ret)
return ret;
- i915_gem_object_retire(obj);
i915_gem_object_flush_gtt_write_domain(obj);
old_write_domain = obj->base.write_domain;
* necessary flushes here.
*/
ret = i915_gem_object_flush_active(obj);
+ if (ret)
+ goto unref;
- args->busy = obj->active;
- if (obj->last_read_req) {
- struct intel_engine_cs *ring;
- BUILD_BUG_ON(I915_NUM_RINGS > 16);
- ring = i915_gem_request_get_ring(obj->last_read_req);
- args->busy |= intel_ring_flag(ring) << 16;
- }
+ BUILD_BUG_ON(I915_NUM_RINGS > 16);
+ args->busy = obj->active << 16;
+ if (obj->last_write_req)
+ args->busy |= obj->last_write_req->ring->id;
+unref:
drm_gem_object_unreference(&obj->base);
unlock:
mutex_unlock(&dev->struct_mutex);
void i915_gem_object_init(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_object_ops *ops)
{
+ int i;
+
INIT_LIST_HEAD(&obj->global_list);
- INIT_LIST_HEAD(&obj->ring_list);
+ for (i = 0; i < I915_NUM_RINGS; i++)
+ INIT_LIST_HEAD(&obj->ring_list[i]);
INIT_LIST_HEAD(&obj->obj_exec_link);
INIT_LIST_HEAD(&obj->vma_list);
INIT_LIST_HEAD(&obj->batch_pool_link);
projects / firefly-linux-kernel-4.4.55.git / commitdiff