}
static noinline struct i915_request *
-i915_request_alloc_slow(struct intel_context *ce)
+request_alloc_slow(struct intel_context *ce, gfp_t gfp)
{
struct intel_ring *ring = ce->ring;
struct i915_request *rq;
if (list_empty(&ring->request_list))
goto out;
+ if (!gfpflags_allow_blocking(gfp))
+ goto out;
+
/* Ratelimit ourselves to prevent oom from malicious clients */
rq = list_last_entry(&ring->request_list, typeof(*rq), ring_link);
cond_synchronize_rcu(rq->rcustate);
ring_retire_requests(ring);
out:
- return kmem_cache_alloc(global.slab_requests, GFP_KERNEL);
+ return kmem_cache_alloc(global.slab_requests, gfp);
}
-/**
- * i915_request_alloc - allocate a request structure
- *
- * @engine: engine that we wish to issue the request on.
- * @ctx: context that the request will be associated with.
- *
- * Returns a pointer to the allocated request if successful,
- * or an error code if not.
- */
struct i915_request *
-i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
+__i915_request_create(struct intel_context *ce, gfp_t gfp)
{
- struct drm_i915_private *i915 = engine->i915;
- struct intel_context *ce;
- struct i915_timeline *tl;
+ struct i915_timeline *tl = ce->ring->timeline;
struct i915_request *rq;
u32 seqno;
int ret;
- lockdep_assert_held(&i915->drm.struct_mutex);
-
- /*
- * Preempt contexts are reserved for exclusive use to inject a
- * preemption context switch. They are never to be used for any trivial
- * request!
- */
- GEM_BUG_ON(ctx == i915->preempt_context);
-
- /*
- * ABI: Before userspace accesses the GPU (e.g. execbuffer), report
- * EIO if the GPU is already wedged.
- */
- ret = i915_terminally_wedged(i915);
- if (ret)
- return ERR_PTR(ret);
+ might_sleep_if(gfpflags_allow_blocking(gfp));
- /*
- * Pinning the contexts may generate requests in order to acquire
- * GGTT space, so do this first before we reserve a seqno for
- * ourselves.
- */
- ce = intel_context_pin(ctx, engine);
- if (IS_ERR(ce))
- return ERR_CAST(ce);
-
- mutex_lock(&ce->ring->timeline->mutex);
- intel_context_enter(ce);
-
- /* Move our oldest request to the slab-cache (if not in use!) */
- rq = list_first_entry(&ce->ring->request_list, typeof(*rq), ring_link);
- if (!list_is_last(&rq->ring_link, &ce->ring->request_list) &&
- i915_request_completed(rq))
- i915_request_retire(rq);
+ /* Check that the caller provided an already pinned context */
+ __intel_context_pin(ce);
/*
* Beware: Dragons be flying overhead.
* Do not use kmem_cache_zalloc() here!
*/
rq = kmem_cache_alloc(global.slab_requests,
- GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
+ gfp | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
if (unlikely(!rq)) {
- rq = i915_request_alloc_slow(ce);
+ rq = request_alloc_slow(ce, gfp);
if (!rq) {
ret = -ENOMEM;
goto err_unreserve;
}
}
- INIT_LIST_HEAD(&rq->active_list);
- INIT_LIST_HEAD(&rq->execute_cb);
-
- tl = ce->ring->timeline;
ret = i915_timeline_get_seqno(tl, rq, &seqno);
if (ret)
goto err_free;
- rq->i915 = i915;
- rq->engine = engine;
- rq->gem_context = ctx;
+ rq->i915 = ce->engine->i915;
rq->hw_context = ce;
+ rq->gem_context = ce->gem_context;
+ rq->engine = ce->engine;
rq->ring = ce->ring;
rq->timeline = tl;
- GEM_BUG_ON(rq->timeline == &engine->timeline);
+ GEM_BUG_ON(rq->timeline == &ce->engine->timeline);
rq->hwsp_seqno = tl->hwsp_seqno;
rq->hwsp_cacheline = tl->hwsp_cacheline;
rq->rcustate = get_state_synchronize_rcu(); /* acts as smp_mb() */
rq->capture_list = NULL;
rq->waitboost = false;
+ INIT_LIST_HEAD(&rq->active_list);
+ INIT_LIST_HEAD(&rq->execute_cb);
+
/*
* Reserve space in the ring buffer for all the commands required to
* eventually emit this request. This is to guarantee that the
* around inside i915_request_add() there is sufficient space at
* the beginning of the ring as well.
*/
- rq->reserved_space = 2 * engine->emit_fini_breadcrumb_dw * sizeof(u32);
+ rq->reserved_space =
+ 2 * rq->engine->emit_fini_breadcrumb_dw * sizeof(u32);
/*
* Record the position of the start of the request so that
*/
rq->head = rq->ring->emit;
- ret = engine->request_alloc(rq);
+ ret = rq->engine->request_alloc(rq);
if (ret)
goto err_unwind;
- /* Keep a second pin for the dual retirement along engine and ring */
- __intel_context_pin(ce);
-
rq->infix = rq->ring->emit; /* end of header; start of user payload */
- /* Check that we didn't interrupt ourselves with a new request */
- lockdep_assert_held(&rq->timeline->mutex);
- GEM_BUG_ON(rq->timeline->seqno != rq->fence.seqno);
- rq->cookie = lockdep_pin_lock(&rq->timeline->mutex);
+ /* Keep a second pin for the dual retirement along engine and ring */
+ __intel_context_pin(ce);
+ intel_context_mark_active(ce);
return rq;
err_unwind:
err_free:
kmem_cache_free(global.slab_requests, rq);
err_unreserve:
- intel_context_exit(ce);
- mutex_unlock(&ce->ring->timeline->mutex);
intel_context_unpin(ce);
return ERR_PTR(ret);
}
+struct i915_request *
+i915_request_create(struct intel_context *ce)
+{
+ struct i915_request *rq;
+
+ intel_context_timeline_lock(ce);
+
+ /* Move our oldest request to the slab-cache (if not in use!) */
+ rq = list_first_entry(&ce->ring->request_list, typeof(*rq), ring_link);
+ if (!list_is_last(&rq->ring_link, &ce->ring->request_list) &&
+ i915_request_completed(rq))
+ i915_request_retire(rq);
+
+ intel_context_enter(ce);
+ rq = __i915_request_create(ce, GFP_KERNEL);
+ intel_context_exit(ce); /* active reference transferred to request */
+ if (IS_ERR(rq))
+ goto err_unlock;
+
+ /* Check that we do not interrupt ourselves with a new request */
+ rq->cookie = lockdep_pin_lock(&ce->ring->timeline->mutex);
+
+ return rq;
+
+err_unlock:
+ intel_context_timeline_unlock(ce);
+ return rq;
+}
+
+/**
+ * i915_request_alloc - allocate a request structure
+ *
+ * @engine: engine that we wish to issue the request on.
+ * @ctx: context that the request will be associated with.
+ *
+ * Returns a pointer to the allocated request if successful,
+ * or an error code if not.
+ */
+struct i915_request *
+i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
+{
+ struct drm_i915_private *i915 = engine->i915;
+ struct intel_context *ce;
+ struct i915_request *rq;
+ int ret;
+
+ /*
+ * Preempt contexts are reserved for exclusive use to inject a
+ * preemption context switch. They are never to be used for any trivial
+ * request!
+ */
+ GEM_BUG_ON(ctx == i915->preempt_context);
+
+ /*
+ * ABI: Before userspace accesses the GPU (e.g. execbuffer), report
+ * EIO if the GPU is already wedged.
+ */
+ ret = i915_terminally_wedged(i915);
+ if (ret)
+ return ERR_PTR(ret);
+
+ /*
+ * Pinning the contexts may generate requests in order to acquire
+ * GGTT space, so do this first before we reserve a seqno for
+ * ourselves.
+ */
+ ce = intel_context_pin(ctx, engine);
+ if (IS_ERR(ce))
+ return ERR_CAST(ce);
+
+ rq = i915_request_create(ce);
+ intel_context_unpin(ce);
+
+ return rq;
+}
+
static int
emit_semaphore_wait(struct i915_request *to,
struct i915_request *from,
* precludes optimising to use semaphores serialisation of a single
* timeline across engines.
*/
- prev = i915_active_request_raw(&timeline->last_request,
- &rq->i915->drm.struct_mutex);
+ prev = rcu_dereference_protected(timeline->last_request.request, 1);
if (prev && !i915_request_completed(prev)) {
if (is_power_of_2(prev->engine->mask | rq->engine->mask))
i915_sw_fence_await_sw_fence(&rq->submit,
list_add_tail(&rq->link, &timeline->requests);
spin_unlock_irq(&timeline->lock);
+ /*
+ * Make sure that no request gazumped us - if it was allocated after
+ * our i915_request_alloc() and called __i915_request_add() before
+ * us, the timeline will hold its seqno which is later than ours.
+ */
GEM_BUG_ON(timeline->seqno != rq->fence.seqno);
__i915_active_request_set(&timeline->last_request, rq);
* request is not being tracked for completion but the work itself is
* going to happen on the hardware. This would be a Bad Thing(tm).
*/
-void i915_request_add(struct i915_request *request)
+struct i915_request *__i915_request_commit(struct i915_request *rq)
{
- struct intel_engine_cs *engine = request->engine;
- struct i915_timeline *timeline = request->timeline;
- struct intel_ring *ring = request->ring;
+ struct intel_engine_cs *engine = rq->engine;
+ struct intel_ring *ring = rq->ring;
struct i915_request *prev;
u32 *cs;
GEM_TRACE("%s fence %llx:%lld\n",
- engine->name, request->fence.context, request->fence.seqno);
-
- lockdep_assert_held(&request->timeline->mutex);
- lockdep_unpin_lock(&request->timeline->mutex, request->cookie);
-
- trace_i915_request_add(request);
-
- /*
- * Make sure that no request gazumped us - if it was allocated after
- * our i915_request_alloc() and called __i915_request_add() before
- * us, the timeline will hold its seqno which is later than ours.
- */
- GEM_BUG_ON(timeline->seqno != request->fence.seqno);
+ engine->name, rq->fence.context, rq->fence.seqno);
/*
* To ensure that this call will not fail, space for its emissions
* should already have been reserved in the ring buffer. Let the ring
* know that it is time to use that space up.
*/
- GEM_BUG_ON(request->reserved_space > request->ring->space);
- request->reserved_space = 0;
+ GEM_BUG_ON(rq->reserved_space > ring->space);
+ rq->reserved_space = 0;
/*
* Record the position of the start of the breadcrumb so that
* GPU processing the request, we never over-estimate the
* position of the ring's HEAD.
*/
- cs = intel_ring_begin(request, engine->emit_fini_breadcrumb_dw);
+ cs = intel_ring_begin(rq, engine->emit_fini_breadcrumb_dw);
GEM_BUG_ON(IS_ERR(cs));
- request->postfix = intel_ring_offset(request, cs);
+ rq->postfix = intel_ring_offset(rq, cs);
- prev = __i915_request_add_to_timeline(request);
+ prev = __i915_request_add_to_timeline(rq);
- list_add_tail(&request->ring_link, &ring->request_list);
- if (list_is_first(&request->ring_link, &ring->request_list))
- list_add(&ring->active_link, &request->i915->gt.active_rings);
- request->i915->gt.active_engines |= request->engine->mask;
- request->emitted_jiffies = jiffies;
+ list_add_tail(&rq->ring_link, &ring->request_list);
+ if (list_is_first(&rq->ring_link, &ring->request_list))
+ list_add(&ring->active_link, &rq->i915->gt.active_rings);
+ rq->i915->gt.active_engines |= rq->engine->mask;
+ rq->emitted_jiffies = jiffies;
/*
* Let the backend know a new request has arrived that may need
* run at the earliest possible convenience.
*/
local_bh_disable();
- i915_sw_fence_commit(&request->semaphore);
+ i915_sw_fence_commit(&rq->semaphore);
rcu_read_lock(); /* RCU serialisation for set-wedged protection */
if (engine->schedule) {
- struct i915_sched_attr attr = request->gem_context->sched;
+ struct i915_sched_attr attr = rq->gem_context->sched;
/*
* Boost actual workloads past semaphores!
* far in the distance past over useful work, we keep a history
* of any semaphore use along our dependency chain.
*/
- if (!(request->sched.flags & I915_SCHED_HAS_SEMAPHORE_CHAIN))
+ if (!(rq->sched.flags & I915_SCHED_HAS_SEMAPHORE_CHAIN))
attr.priority |= I915_PRIORITY_NOSEMAPHORE;
/*
* Allow interactive/synchronous clients to jump ahead of
* the bulk clients. (FQ_CODEL)
*/
- if (list_empty(&request->sched.signalers_list))
+ if (list_empty(&rq->sched.signalers_list))
attr.priority |= I915_PRIORITY_NEWCLIENT;
- engine->schedule(request, &attr);
+ engine->schedule(rq, &attr);
}
rcu_read_unlock();
- i915_sw_fence_commit(&request->submit);
+ i915_sw_fence_commit(&rq->submit);
local_bh_enable(); /* Kick the execlists tasklet if just scheduled */
+ return prev;
+}
+
+void i915_request_add(struct i915_request *rq)
+{
+ struct i915_request *prev;
+
+ lockdep_assert_held(&rq->timeline->mutex);
+ lockdep_unpin_lock(&rq->timeline->mutex, rq->cookie);
+
+ trace_i915_request_add(rq);
+
+ prev = __i915_request_commit(rq);
+
/*
* In typical scenarios, we do not expect the previous request on
* the timeline to be still tracked by timeline->last_request if it
if (prev && i915_request_completed(prev))
i915_request_retire_upto(prev);
- mutex_unlock(&request->timeline->mutex);
+ mutex_unlock(&rq->timeline->mutex);
}
static unsigned long local_clock_us(unsigned int *cpu)
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