[PATCH 57/62] drm/i915: Keep contexts pinned until after the next kernel context switch
Chris Wilson
chris at chris-wilson.co.uk
Tue Feb 5 11:23:24 UTC 2019
We need to keep the context image pinned in memory until after the GPU
has finished writing into it. Since it continues to write as we signal
the final breadcrumb, we need to keep it pinned until the request after
it is complete. Currently we know the order in which requests execute on
each engine, and so to remove that presumption we need to identify a
request/context-switch we know must occur after our completion. Any
request queued after the signal must imply a context switch, for
simplicity we use a fresh request from the kernel context.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_active.c | 70 ++++++++++++++++++
drivers/gpu/drm/i915/i915_active.h | 4 ++
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/i915_gem.c | 45 +++++++-----
drivers/gpu/drm/i915/i915_gem_context.c | 30 +++-----
drivers/gpu/drm/i915/i915_gem_context.h | 4 +-
drivers/gpu/drm/i915/i915_gem_evict.c | 25 +++----
drivers/gpu/drm/i915/i915_request.c | 15 ----
drivers/gpu/drm/i915/i915_reset.c | 5 +-
drivers/gpu/drm/i915/intel_engine_cs.c | 39 +++++-----
drivers/gpu/drm/i915/intel_lrc.c | 71 +++++++++----------
drivers/gpu/drm/i915/intel_ringbuffer.c | 37 +++++-----
drivers/gpu/drm/i915/intel_ringbuffer.h | 14 +---
drivers/gpu/drm/i915/selftests/mock_engine.c | 5 --
.../gpu/drm/i915/selftests/mock_gem_device.c | 1 -
15 files changed, 201 insertions(+), 165 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
index 846900535d10..64e29d644399 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -247,6 +247,76 @@ void i915_active_fini(struct i915_active *ref)
}
#endif
+int i915_active_acquire_barrier(struct i915_active *ref,
+ struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *i915 = engine->i915;
+ unsigned long tmp;
+ int err = 0;
+
+ lockdep_assert_held(&i915->drm.struct_mutex);
+ i915->gt.idle_barriers |= engine->mask;
+
+ i915_active_acquire(ref);
+ for_each_engine_masked(engine, i915, engine->mask, tmp) {
+ struct intel_context *kctx =
+ to_intel_context(i915->kernel_context, engine);
+ u64 idx = kctx->ring->timeline->fence_context;
+ struct rb_node **p, *parent;
+ struct active_node *node;
+
+ parent = NULL;
+ p = &ref->tree.rb_node;
+ while (*p) {
+ parent = *p;
+
+ node = rb_entry(parent, struct active_node, node);
+ if (node->timeline == idx)
+ goto replace;
+
+ if (node->timeline < idx)
+ p = &parent->rb_right;
+ else
+ p = &parent->rb_left;
+ }
+
+ /* Think before you shrink! */
+ node = kmem_cache_alloc(global.slab_cache, GFP_KERNEL);
+ if (unlikely(!node)) {
+ err = -ENOMEM;
+ break;
+ }
+
+ i915_active_request_init(&node->base, NULL, node_retire);
+ node->ref = ref;
+ node->timeline = idx;
+
+ rb_link_node(&node->node, parent, p);
+ rb_insert_color(&node->node, &ref->tree);
+
+replace:
+ ref->count += !node->base.request;
+ RCU_INIT_POINTER(node->base.request, ERR_PTR(-EAGAIN));
+ list_move_tail(&node->base.link, &engine->barrier_tasks);
+ }
+ i915_active_release(ref);
+
+ return err;
+}
+
+void i915_request_add_barriers(struct i915_request *rq)
+{
+ struct intel_engine_cs *engine = rq->engine;
+
+ lockdep_assert_held(&rq->i915->drm.struct_mutex);
+
+ GEM_BUG_ON(!is_power_of_2(engine->mask));
+ if (!__test_and_clear_bit(engine->id, &engine->i915->gt.idle_barriers))
+ return;
+
+ list_splice_tail_init(&engine->barrier_tasks, &rq->active_list);
+}
+
int i915_active_request_set(struct i915_active_request *active,
struct i915_request *rq)
{
diff --git a/drivers/gpu/drm/i915/i915_active.h b/drivers/gpu/drm/i915/i915_active.h
index a049ccd478c6..431af010ec96 100644
--- a/drivers/gpu/drm/i915/i915_active.h
+++ b/drivers/gpu/drm/i915/i915_active.h
@@ -406,6 +406,10 @@ void i915_active_fini(struct i915_active *ref);
static inline void i915_active_fini(struct i915_active *ref) { }
#endif
+int i915_active_acquire_barrier(struct i915_active *ref,
+ struct intel_engine_cs *engine);
+void i915_request_add_barriers(struct i915_request *rq);
+
int i915_global_active_init(void);
void i915_global_active_shrink(void);
void i915_global_active_exit(void);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7e2dedcb9eac..d0f48cd8ada8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1984,6 +1984,7 @@ struct drm_i915_private {
struct list_head active_rings;
struct list_head closed_vma;
unsigned long active_engines;
+ unsigned long idle_barriers;
u32 active_requests;
/**
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 7b7d9b8a312f..fdca0976f25a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -109,6 +109,7 @@ static u32 __i915_gem_park(struct drm_i915_private *i915)
lockdep_assert_held(&i915->drm.struct_mutex);
GEM_BUG_ON(i915->gt.active_requests);
+ GEM_BUG_ON(i915->gt.idle_barriers);
GEM_BUG_ON(!list_empty(&i915->gt.active_rings));
if (!i915->gt.awake)
@@ -2847,14 +2848,14 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
static void
i915_gem_retire_work_handler(struct work_struct *work)
{
- struct drm_i915_private *dev_priv =
- container_of(work, typeof(*dev_priv), gt.retire_work.work);
- struct drm_device *dev = &dev_priv->drm;
+ struct drm_i915_private *i915 =
+ container_of(work, typeof(*i915), gt.retire_work.work);
/* Come back later if the device is busy... */
- if (mutex_trylock(&dev->struct_mutex)) {
- i915_retire_requests(dev_priv);
- mutex_unlock(&dev->struct_mutex);
+ if (mutex_trylock(&i915->drm.struct_mutex)) {
+ i915_gem_switch_to_kernel_context(i915, i915->gt.idle_barriers);
+ i915_retire_requests(i915);
+ mutex_unlock(&i915->drm.struct_mutex);
}
/*
@@ -2862,9 +2863,9 @@ i915_gem_retire_work_handler(struct work_struct *work)
* We do not need to do this test under locking as in the worst-case
* we queue the retire worker once too often.
*/
- if (READ_ONCE(dev_priv->gt.awake))
- queue_delayed_work(dev_priv->wq,
- &dev_priv->gt.retire_work,
+ if (READ_ONCE(i915->gt.awake))
+ queue_delayed_work(i915->wq,
+ &i915->gt.retire_work,
round_jiffies_up_relative(HZ));
}
@@ -2928,8 +2929,8 @@ static void __sleep_rcu(struct rcu_head *rcu)
}
}
-static bool switch_to_kernel_context_sync(struct drm_i915_private *i915,
- unsigned long mask)
+static bool __switch_to_kernel_context_sync(struct drm_i915_private *i915,
+ unsigned long mask)
{
if (i915_gem_switch_to_kernel_context(i915, mask))
return false;
@@ -2943,10 +2944,22 @@ static bool switch_to_kernel_context_sync(struct drm_i915_private *i915,
return true;
}
+static bool switch_to_kernel_context_idle(struct drm_i915_private *i915,
+ unsigned long mask)
+{
+ if (!__switch_to_kernel_context_sync(i915, mask))
+ return false;
+
+ if (!__switch_to_kernel_context_sync(i915, i915->gt.idle_barriers))
+ return false;
+
+ return true;
+}
+
static bool load_power_context(struct drm_i915_private *i915)
{
/* Force loading the kernel context on all engines */
- if (!switch_to_kernel_context_sync(i915, -1))
+ if (!switch_to_kernel_context_idle(i915, -1))
return false;
/*
@@ -2995,7 +3008,7 @@ i915_gem_idle_work_handler(struct work_struct *work)
if (!gt->active_requests && !work_pending(>->idle_work.work)) {
++gt->active_requests; /* don't requeue idle */
- if (!switch_to_kernel_context_sync(i915,
+ if (!switch_to_kernel_context_idle(i915,
i915->gt.active_engines)) {
dev_err(i915->drm.dev,
"Failed to idle engines, declaring wedged!\n");
@@ -4444,10 +4457,6 @@ void i915_gem_sanitize(struct drm_i915_private *i915)
intel_uncore_forcewake_put(i915, FORCEWAKE_ALL);
intel_runtime_pm_put(i915, wakeref);
-
- mutex_lock(&i915->drm.struct_mutex);
- i915_gem_contexts_lost(i915);
- mutex_unlock(&i915->drm.struct_mutex);
}
void i915_gem_suspend(struct drm_i915_private *i915)
@@ -4472,7 +4481,7 @@ void i915_gem_suspend(struct drm_i915_private *i915)
* state. Fortunately, the kernel_context is disposable and we do
* not rely on its state.
*/
- if (!switch_to_kernel_context_sync(i915, i915->gt.active_engines)) {
+ if (!switch_to_kernel_context_idle(i915, i915->gt.active_engines)) {
/* Forcibly cancel outstanding work and leave the gpu quiet. */
i915_gem_set_wedged(i915);
}
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index d8d6cee333dd..f3b639bfa16a 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -335,13 +335,17 @@ static u32 default_desc_template(const struct drm_i915_private *i915,
return desc;
}
-static void intel_context_retire(struct i915_active_request *active,
- struct i915_request *rq)
+void intel_context_retire(struct i915_active *active)
{
struct intel_context *ce =
container_of(active, typeof(*ce), active_tracker);
- intel_context_unpin(ce);
+ if (ce->state) {
+ ce->state->obj->pin_global--;
+ i915_vma_unpin(ce->state);
+ }
+
+ i915_gem_context_put(ce->gem_context);
}
void
@@ -358,8 +362,7 @@ intel_context_init(struct intel_context *ce,
/* Use the whole device by default */
ce->sseu = intel_device_default_sseu(ctx->i915);
- i915_active_request_init(&ce->active_tracker,
- NULL, intel_context_retire);
+ i915_active_init(ctx->i915, &ce->active_tracker, intel_context_retire);
}
static struct i915_gem_context *
@@ -656,17 +659,6 @@ int i915_gem_contexts_init(struct drm_i915_private *dev_priv)
return 0;
}
-void i915_gem_contexts_lost(struct drm_i915_private *dev_priv)
-{
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
-
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
- for_each_engine(engine, dev_priv, id)
- intel_engine_lost_context(engine);
-}
-
void i915_gem_contexts_fini(struct drm_i915_private *i915)
{
lockdep_assert_held(&i915->drm.struct_mutex);
@@ -951,6 +943,7 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915,
I915_FENCE_GFP);
}
+ i915_request_add_barriers(rq);
i915_request_add(rq);
}
@@ -1144,9 +1137,8 @@ gen8_modify_rpcs_gpu(struct intel_context *ce,
* But we only need to take one pin on the account of it. Or in other
* words transfer the pinned ce object to tracked active request.
*/
- if (!i915_active_request_isset(&ce->active_tracker))
- __intel_context_pin(ce);
- __i915_active_request_set(&ce->active_tracker, rq);
+ GEM_BUG_ON(i915_active_is_idle(&ce->active_tracker));
+ ret = i915_active_ref(&ce->active_tracker, rq->fence.context, rq);
out_add:
i915_request_add(rq);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h
index b1eeac64da8b..0b7d943f3d63 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/i915_gem_context.h
@@ -188,7 +188,7 @@ struct i915_gem_context {
* active_tracker: Active tracker for the external rq activity
* on this intel_context object.
*/
- struct i915_active_request active_tracker;
+ struct i915_active active_tracker;
const struct intel_context_ops *ops;
@@ -347,7 +347,6 @@ static inline void intel_context_unpin(struct intel_context *ce)
/* i915_gem_context.c */
int __must_check i915_gem_contexts_init(struct drm_i915_private *dev_priv);
-void i915_gem_contexts_lost(struct drm_i915_private *dev_priv);
void i915_gem_contexts_fini(struct drm_i915_private *dev_priv);
int i915_gem_context_open(struct drm_i915_private *i915,
@@ -396,5 +395,6 @@ static inline void i915_gem_context_put(struct i915_gem_context *ctx)
void intel_context_init(struct intel_context *ce,
struct i915_gem_context *ctx,
struct intel_engine_cs *engine);
+void intel_context_retire(struct i915_active *active);
#endif /* !__I915_GEM_CONTEXT_H__ */
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 060f5903544a..43f61d7eb1d0 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -38,7 +38,7 @@ I915_SELFTEST_DECLARE(static struct igt_evict_ctl {
static bool ggtt_is_idle(struct drm_i915_private *i915)
{
- return !i915->gt.active_requests;
+ return !i915->gt.active_requests && !i915->gt.idle_barriers;
}
static int ggtt_flush(struct drm_i915_private *i915)
@@ -52,19 +52,14 @@ static int ggtt_flush(struct drm_i915_private *i915)
* the hopes that we can then remove contexts and the like only
* bound by their active reference.
*/
- err = i915_gem_switch_to_kernel_context(i915, i915->gt.active_engines);
+ err = i915_gem_switch_to_kernel_context(i915, i915->gt.idle_barriers);
if (err)
return err;
- err = i915_gem_wait_for_idle(i915,
- I915_WAIT_INTERRUPTIBLE |
- I915_WAIT_LOCKED,
- MAX_SCHEDULE_TIMEOUT);
- if (err)
- return err;
-
- GEM_BUG_ON(!ggtt_is_idle(i915));
- return 0;
+ return i915_gem_wait_for_idle(i915,
+ I915_WAIT_INTERRUPTIBLE |
+ I915_WAIT_LOCKED,
+ MAX_SCHEDULE_TIMEOUT);
}
static bool
@@ -414,9 +409,11 @@ int i915_gem_evict_vm(struct i915_address_space *vm)
* switch otherwise is ineffective.
*/
if (i915_is_ggtt(vm)) {
- ret = ggtt_flush(vm->i915);
- if (ret)
- return ret;
+ do {
+ ret = ggtt_flush(vm->i915);
+ if (ret)
+ return ret;
+ } while (!ggtt_is_idle(vm->i915));
}
INIT_LIST_HEAD(&eviction_list);
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 53dbe2964d90..f2a8da045470 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -221,18 +221,6 @@ static void __retire_engine_request(struct intel_engine_cs *engine,
spin_unlock(&rq->lock);
local_irq_enable();
-
- /*
- * The backing object for the context is done after switching to the
- * *next* context. Therefore we cannot retire the previous context until
- * the next context has already started running. However, since we
- * cannot take the required locks at i915_request_submit() we
- * defer the unpinning of the active context to now, retirement of
- * the subsequent request.
- */
- if (engine->last_retired_context)
- intel_context_unpin(engine->last_retired_context);
- engine->last_retired_context = rq->hw_context;
}
static void __retire_engine_upto(struct intel_engine_cs *engine,
@@ -760,9 +748,6 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
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 */
diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c
index 78c9689629a0..51cc730e6ccb 100644
--- a/drivers/gpu/drm/i915/i915_reset.c
+++ b/drivers/gpu/drm/i915/i915_reset.c
@@ -758,9 +758,8 @@ static void reset_restart(struct drm_i915_private *i915)
/*
* Following the reset, ensure that we always reload context for
- * powersaving, and to correct engine->last_retired_context. Since
- * this requires us to submit a request, queue a worker to do that
- * task for us to evade any locking here.
+ * powersaving. Since this requires us to submit a request, queue
+ * a worker to do that task for us to evade any locking here.
*/
if (READ_ONCE(i915->gpu_error.restart))
return;
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 0372aaa9756c..860370f330b7 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -575,6 +575,8 @@ int intel_engine_setup_common(struct intel_engine_cs *engine)
{
int err;
+ INIT_LIST_HEAD(&engine->barrier_tasks);
+
err = init_status_page(engine);
if (err)
return err;
@@ -756,6 +758,18 @@ int intel_engine_init_common(struct intel_engine_cs *engine)
return ret;
}
+static void call_barrier_tasks(struct intel_engine_cs *engine)
+{
+ struct i915_active_request *task, *next;
+
+ list_for_each_entry_safe(task, next, &engine->barrier_tasks, link) {
+ INIT_LIST_HEAD(&task->link);
+ RCU_INIT_POINTER(task->request, NULL);
+ task->retire(task, NULL);
+ }
+ INIT_LIST_HEAD(&engine->barrier_tasks);
+}
+
/**
* intel_engines_cleanup_common - cleans up the engine state created by
* the common initiailizers.
@@ -776,10 +790,15 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine)
if (engine->default_state)
i915_gem_object_put(engine->default_state);
+ GEM_BUG_ON(!list_empty(&engine->barrier_tasks));
+
if (i915->preempt_context)
__intel_context_unpin(i915->preempt_context, engine);
__intel_context_unpin(i915->kernel_context, engine);
+ /* The only tasks that remain should be the kernel context unpin */
+ call_barrier_tasks(engine);
+
i915_timeline_fini(&engine->timeline);
intel_wa_list_free(&engine->ctx_wa_list);
@@ -1208,26 +1227,6 @@ void intel_engines_unpark(struct drm_i915_private *i915)
}
}
-/**
- * intel_engine_lost_context: called when the GPU is reset into unknown state
- * @engine: the engine
- *
- * We have either reset the GPU or otherwise about to lose state tracking of
- * the current GPU logical state (e.g. suspend). On next use, it is therefore
- * imperative that we make no presumptions about the current state and load
- * from scratch.
- */
-void intel_engine_lost_context(struct intel_engine_cs *engine)
-{
- struct intel_context *ce;
-
- lockdep_assert_held(&engine->i915->drm.struct_mutex);
-
- ce = fetch_and_zero(&engine->last_retired_context);
- if (ce)
- intel_context_unpin(ce);
-}
-
bool intel_engine_can_store_dword(struct intel_engine_cs *engine)
{
switch (INTEL_GEN(engine->i915)) {
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 5a8c5c00170e..5cd8bfa86f57 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1444,38 +1444,15 @@ static void execlists_context_destroy(struct intel_context *ce)
static void execlists_context_unpin(struct intel_context *ce)
{
- struct intel_engine_cs *engine;
-
- /*
- * The tasklet may still be using a pointer to our state, via an
- * old request. However, since we know we only unpin the context
- * on retirement of the following request, we know that the last
- * request referencing us will have had a completion CS interrupt.
- * If we see that it is still active, it means that the tasklet hasn't
- * had the chance to run yet; let it run before we teardown the
- * reference it may use.
- */
- engine = READ_ONCE(ce->active);
- if (unlikely(engine)) {
- unsigned long flags;
-
- spin_lock_irqsave(&engine->timeline.lock, flags);
- process_csb(engine);
- spin_unlock_irqrestore(&engine->timeline.lock, flags);
-
- GEM_BUG_ON(READ_ONCE(ce->active));
- }
-
i915_gem_context_unpin_hw_id(ce->gem_context);
intel_ring_unpin(ce->ring);
- ce->state->obj->pin_global--;
i915_gem_object_unpin_map(ce->state->obj);
- i915_vma_unpin(ce->state);
+ i915_active_acquire_barrier(&ce->active_tracker, ce->engine);
+ i915_active_release(&ce->active_tracker);
list_del(&ce->active_link);
- i915_gem_context_put(ce->gem_context);
}
static int __context_pin(struct i915_gem_context *ctx, struct i915_vma *vma)
@@ -1507,6 +1484,9 @@ __execlists_update_reg_state(struct intel_engine_cs *engine,
u32 *regs = ce->lrc_reg_state;
struct intel_ring *ring = ce->ring;
+ GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->head));
+ GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->tail));
+
regs[CTX_RING_BUFFER_START + 1] = i915_ggtt_offset(ring->vma);
regs[CTX_RING_HEAD + 1] = ring->head;
regs[CTX_RING_TAIL + 1] = ring->tail;
@@ -1530,9 +1510,22 @@ __execlists_context_pin(struct intel_engine_cs *engine,
goto err;
GEM_BUG_ON(!ce->state);
- ret = __context_pin(ctx, ce->state);
- if (ret)
- goto err;
+ if (i915_active_acquire(&ce->active_tracker)) {
+ ret = __context_pin(ctx, ce->state);
+ if (ret) {
+ i915_active_cancel(&ce->active_tracker);
+ goto err;
+ }
+
+ ce->state->obj->pin_global++;
+ i915_gem_context_get(ctx);
+
+ /* Preallocate tracking nodes */
+ ret = i915_active_acquire_barrier(&ce->active_tracker,
+ ce->engine);
+ if (ret)
+ goto unpin_vma;
+ }
vaddr = i915_gem_object_pin_map(ce->state->obj,
i915_coherent_map_type(ctx->i915) |
@@ -1552,14 +1545,10 @@ __execlists_context_pin(struct intel_engine_cs *engine,
intel_lr_context_descriptor_update(ctx, engine, ce);
- GEM_BUG_ON(!intel_ring_offset_valid(ce->ring, ce->ring->head));
-
ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
__execlists_update_reg_state(engine, ce);
- ce->state->obj->pin_global++;
- i915_gem_context_get(ctx);
list_add(&ce->active_link, &ctx->active_engines);
return ce;
@@ -1568,7 +1557,7 @@ __execlists_context_pin(struct intel_engine_cs *engine,
unpin_map:
i915_gem_object_unpin_map(ce->state->obj);
unpin_vma:
- __i915_vma_unpin(ce->state);
+ i915_active_release(&ce->active_tracker);
err:
ce->pin_count = 0;
return ERR_PTR(ret);
@@ -3107,13 +3096,20 @@ static void virtual_engine_free(struct kref *kref)
kfree(ve);
}
+static void virtual_context_retire(struct i915_active *ref)
+{
+ struct virtual_engine *ve =
+ container_of(ref, typeof(*ve), context.active_tracker);
+
+ intel_context_retire(ref);
+ kref_put(&ve->kref, virtual_engine_free);
+}
+
static void virtual_context_unpin(struct intel_context *ce)
{
struct virtual_engine *ve = container_of(ce, typeof(*ve), context);
execlists_context_unpin(ce);
-
- kref_put(&ve->kref, virtual_engine_free);
}
static const struct intel_context_ops virtual_context_ops = {
@@ -3159,7 +3155,9 @@ virtual_context_pin(struct intel_engine_cs *engine,
return ce;
GEM_BUG_ON(!ce->pin_count); /* no overflow please! */
- kref_get(&ve->kref);
+ if (i915_active_is_idle(&ce->active_tracker))
+ kref_get(&ve->kref);
+
ce->ops = &virtual_context_ops;
/* Note: we must use a real engine class for setting up reg state */
@@ -3322,6 +3320,7 @@ intel_execlists_create_virtual(struct i915_gem_context *ctx,
i915_timeline_set_subclass(&ve->base.timeline, TIMELINE_VIRTUAL);
intel_context_init(&ve->context, ctx, &ve->base);
+ ve->context.active_tracker.retire = virtual_context_retire;
ve->base.context_pin = virtual_context_pin;
ve->base.request_alloc = execlists_request_alloc;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index a934122d173b..62d459188beb 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1426,25 +1426,13 @@ static int __context_pin(struct intel_context *ce)
return 0;
}
-static void __context_unpin(struct intel_context *ce)
-{
- struct i915_vma *vma;
-
- vma = ce->state;
- if (!vma)
- return;
-
- vma->obj->pin_global--;
- i915_vma_unpin(vma);
-}
-
static void intel_ring_context_unpin(struct intel_context *ce)
{
__context_unpin_ppgtt(ce->gem_context);
- __context_unpin(ce);
+ i915_active_acquire_barrier(&ce->active_tracker, ce->engine);
+ i915_active_release(&ce->active_tracker);
list_del(&ce->active_link);
- i915_gem_context_put(ce->gem_context);
}
static struct i915_vma *
@@ -1535,15 +1523,26 @@ __ring_context_pin(struct intel_engine_cs *engine,
ce->state = vma;
}
- err = __context_pin(ce);
- if (err)
- goto err;
+ if (i915_active_acquire(&ce->active_tracker)) {
+ err = __context_pin(ce);
+ if (err) {
+ i915_active_cancel(&ce->active_tracker);
+ goto err;
+ }
+
+ i915_gem_context_get(ctx);
+
+ /* Preallocate tracking nodes */
+ err = i915_active_acquire_barrier(&ce->active_tracker,
+ ce->engine);
+ if (err)
+ goto err_unpin;
+ }
err = __context_pin_ppgtt(ce->gem_context);
if (err)
goto err_unpin;
- i915_gem_context_get(ctx);
list_add(&ce->active_link, &ctx->active_engines);
/* One ringbuffer to rule them all */
@@ -1553,7 +1552,7 @@ __ring_context_pin(struct intel_engine_cs *engine,
return ce;
err_unpin:
- __context_unpin(ce);
+ i915_active_release(&ce->active_tracker);
err:
ce->pin_count = 0;
return ERR_PTR(err);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index c827dfe15df0..6a030a538e5d 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -347,6 +347,7 @@ struct intel_engine_cs {
struct intel_ring *buffer;
struct i915_timeline timeline;
+ struct list_head barrier_tasks;
struct drm_i915_gem_object *default_state;
void *pinned_default_state;
@@ -487,17 +488,6 @@ struct intel_engine_cs {
struct intel_engine_execlists execlists;
- /* Contexts are pinned whilst they are active on the GPU. The last
- * context executed remains active whilst the GPU is idle - the
- * switch away and write to the context object only occurs on the
- * next execution. Contexts are only unpinned on retirement of the
- * following request ensuring that we can always write to the object
- * on the context switch even after idling. Across suspend, we switch
- * to the kernel context and trash it as the save may not happen
- * before the hardware is powered down.
- */
- struct intel_context *last_retired_context;
-
/* status_notifier: list of callbacks for context-switch changes */
struct atomic_notifier_head context_status_notifier;
@@ -937,8 +927,6 @@ void intel_engines_sanitize(struct drm_i915_private *i915, bool force);
bool intel_engine_is_idle(struct intel_engine_cs *engine);
bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
-void intel_engine_lost_context(struct intel_engine_cs *engine);
-
void intel_engines_park(struct drm_i915_private *i915);
void intel_engines_unpark(struct drm_i915_private *i915);
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c
index b8c6769571c4..ab7319f27846 100644
--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -283,14 +283,9 @@ void mock_engine_free(struct intel_engine_cs *engine)
{
struct mock_engine *mock =
container_of(engine, typeof(*mock), base);
- struct intel_context *ce;
GEM_BUG_ON(timer_pending(&mock->hw_delay));
- ce = fetch_and_zero(&engine->last_retired_context);
- if (ce)
- intel_context_unpin(ce);
-
__intel_context_unpin(engine->i915->kernel_context, engine);
intel_engine_fini_breadcrumbs(engine);
diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index d00679e21415..be5e871be26b 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -55,7 +55,6 @@ static void mock_device_release(struct drm_device *dev)
mutex_lock(&i915->drm.struct_mutex);
mock_device_flush(i915);
- i915_gem_contexts_lost(i915);
mutex_unlock(&i915->drm.struct_mutex);
drain_delayed_work(&i915->gt.retire_work);
--
2.20.1
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