[PATCH 65/86] drm/i915/preemption: Select timeout when scheduling
Chris Wilson
chris at chris-wilson.co.uk
Fri Sep 28 08:51:40 UTC 2018
The choice of preemption timeout is determined by the context from which
we trigger the preemption, as such allow the caller to specify the
desired timeout.
Effectively the other choice would be to use the shortest timeout along
the dependency chain. However, given that we would have already
triggered preemption for the dependency chain, we can assume that no
preemption along that chain is more important than the current request,
ergo we need only consider the current timeout. Realising this, we can
then pass control of the preemption timeout to the caller for greater
flexibility.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/i915_request.c | 2 +-
drivers/gpu/drm/i915/i915_scheduler.c | 11 ++-
drivers/gpu/drm/i915/i915_scheduler.h | 5 +-
drivers/gpu/drm/i915/intel_ringbuffer.h | 3 +-
drivers/gpu/drm/i915/selftests/intel_lrc.c | 110 ++++++++++++++++++++-
6 files changed, 123 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8ca2be6193f1..fe472069d871 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -573,7 +573,7 @@ static void __fence_set_priority(struct dma_fence *fence,
local_bh_disable();
rcu_read_lock(); /* RCU serialisation for set-wedged protection */
if (engine->schedule)
- engine->schedule(rq, attr);
+ engine->schedule(rq, attr, 0);
rcu_read_unlock();
local_bh_enable(); /* kick the tasklets if queues were reprioritised */
}
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 9d54b7ad05d1..298b5fa0483c 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1060,7 +1060,7 @@ void i915_request_add(struct i915_request *request)
if (!prev || i915_request_completed(prev))
attr.priority |= I915_PRIORITY_NEWCLIENT;
- engine->schedule(request, &attr);
+ engine->schedule(request, &attr, 0);
}
rcu_read_unlock();
i915_sw_fence_commit(&request->submit);
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index ad1db9d0482c..11d9308e4113 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -240,7 +240,8 @@ sched_lock_engine(struct i915_sched_node *node, struct intel_engine_cs *locked)
}
static void __i915_schedule(struct i915_request *rq,
- const struct i915_sched_attr *attr)
+ const struct i915_sched_attr *attr,
+ unsigned int timeout)
{
struct list_head *uninitialized_var(pl);
struct intel_engine_cs *engine, *last;
@@ -374,10 +375,12 @@ static void __i915_schedule(struct i915_request *rq,
spin_unlock_irq(&engine->timeline.lock);
}
-void i915_schedule(struct i915_request *rq, const struct i915_sched_attr *attr)
+void i915_schedule(struct i915_request *rq,
+ const struct i915_sched_attr *attr,
+ unsigned int timeout)
{
spin_lock(&schedule_lock);
- __i915_schedule(rq, attr);
+ __i915_schedule(rq, attr, timeout);
spin_unlock(&schedule_lock);
}
@@ -394,7 +397,7 @@ void i915_schedule_bump_priority(struct i915_request *rq, unsigned int bump)
attr = rq->sched.attr;
attr.priority |= bump;
- __i915_schedule(rq, &attr);
+ __i915_schedule(rq, &attr, 0);
spin_unlock_bh(&schedule_lock);
}
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index dbe9cb7ecd82..1a11c48a6576 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -97,8 +97,9 @@ int i915_sched_node_add_dependency(struct drm_i915_private *i915,
void i915_sched_node_fini(struct drm_i915_private *i915,
struct i915_sched_node *node);
-void i915_schedule(struct i915_request *request,
- const struct i915_sched_attr *attr);
+void i915_schedule(struct i915_request *rq,
+ const struct i915_sched_attr *attr,
+ unsigned int timeout);
void i915_schedule_bump_priority(struct i915_request *rq, unsigned int bump);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 8795461974f4..23d5e60a079b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -512,7 +512,8 @@ struct intel_engine_cs {
* not be ready to run!
*/
void (*schedule)(struct i915_request *request,
- const struct i915_sched_attr *attr);
+ const struct i915_sched_attr *attr,
+ unsigned int timeout);
/*
* Cancel all requests on the hardware, or queued for execution.
diff --git a/drivers/gpu/drm/i915/selftests/intel_lrc.c b/drivers/gpu/drm/i915/selftests/intel_lrc.c
index e9ff775e2e2d..28fc08bb63b8 100644
--- a/drivers/gpu/drm/i915/selftests/intel_lrc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_lrc.c
@@ -429,7 +429,7 @@ static int live_late_preempt(void *arg)
}
attr.priority = I915_USER_PRIORITY(I915_PRIORITY_MAX);
- engine->schedule(rq, &attr);
+ engine->schedule(rq, &attr, 0);
if (!wait_for_spinner(&spin_hi, rq)) {
pr_err("High priority context failed to preempt the low priority context\n");
@@ -771,6 +771,113 @@ static int live_preempt_reset(void *arg)
return err;
}
+static int live_late_preempt_timeout(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct i915_gem_context *ctx_hi, *ctx_lo;
+ struct spinner spin_hi, spin_lo;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ int err = -ENOMEM;
+
+ if (!HAS_LOGICAL_RING_PREEMPTION(i915))
+ return 0;
+
+ mutex_lock(&i915->drm.struct_mutex);
+
+ if (spinner_init(&spin_hi, i915))
+ goto err_unlock;
+
+ if (spinner_init(&spin_lo, i915))
+ goto err_spin_hi;
+
+ ctx_hi = kernel_context(i915);
+ if (!ctx_hi)
+ goto err_spin_lo;
+
+ ctx_lo = kernel_context(i915);
+ if (!ctx_lo)
+ goto err_ctx_hi;
+
+ for_each_engine(engine, i915, id) {
+ struct i915_request *rq;
+
+ rq = spinner_create_request(&spin_lo, ctx_lo, engine, MI_NOOP);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto err_ctx_lo;
+ }
+
+ i915_request_add(rq);
+ if (!wait_for_spinner(&spin_lo, rq)) {
+ pr_err("First context failed to start\n");
+ goto err_wedged;
+ }
+
+ rq = spinner_create_request(&spin_hi, ctx_hi, engine, MI_NOOP);
+ if (IS_ERR(rq)) {
+ spinner_end(&spin_lo);
+ err = PTR_ERR(rq);
+ goto err_ctx_lo;
+ }
+
+ i915_request_add(rq);
+ if (wait_for_spinner(&spin_hi, rq)) {
+ pr_err("Second context overtook first?\n");
+ goto err_wedged;
+ }
+
+ GEM_TRACE("%s rescheduling (no timeout)\n", engine->name);
+ engine->schedule(rq, &(struct i915_sched_attr){
+ .priority = I915_USER_PRIORITY(1),
+ }, 0);
+
+ if (wait_for_spinner(&spin_hi, rq)) {
+ pr_err("High priority context overtook first without an arbitration point?\n");
+ goto err_wedged;
+ }
+
+ GEM_TRACE("%s rescheduling (with timeout)\n", engine->name);
+ engine->schedule(rq, &(struct i915_sched_attr){
+ .priority = I915_USER_PRIORITY(2),
+ }, 10 * 1000 /* 10us */);
+
+ if (!wait_for_spinner(&spin_hi, rq)) {
+ pr_err("High priority context failed to force itself in front of the low priority context\n");
+ GEM_TRACE_DUMP();
+ goto err_wedged;
+ }
+
+ spinner_end(&spin_hi);
+ spinner_end(&spin_lo);
+ if (igt_flush_test(i915, I915_WAIT_LOCKED)) {
+ err = -EIO;
+ goto err_ctx_lo;
+ }
+ }
+
+ err = 0;
+err_ctx_lo:
+ kernel_context_close(ctx_lo);
+err_ctx_hi:
+ kernel_context_close(ctx_hi);
+err_spin_lo:
+ spinner_fini(&spin_lo);
+err_spin_hi:
+ spinner_fini(&spin_hi);
+err_unlock:
+ igt_flush_test(i915, I915_WAIT_LOCKED);
+ mutex_unlock(&i915->drm.struct_mutex);
+ return err;
+
+err_wedged:
+ spinner_end(&spin_hi);
+ spinner_end(&spin_lo);
+ i915_gem_set_wedged(i915);
+ err = -EIO;
+ goto err_ctx_lo;
+}
+
static int random_range(struct rnd_state *rnd, int min, int max)
{
return i915_prandom_u32_max_state(max - min, rnd) + min;
@@ -1407,6 +1514,7 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915)
SUBTEST(live_preempt_hang),
SUBTEST(live_preempt_timeout),
SUBTEST(live_preempt_reset),
+ SUBTEST(live_late_preempt_timeout),
SUBTEST(live_preempt_smoke),
SUBTEST(live_virtual_engine),
SUBTEST(live_virtual_bond),
--
2.19.0
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