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drm/i915: Replace engine->timeline with a plain list

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To continue the onslaught of removing the assumption of a global
execution ordering, another casualty is the engine->timeline. Without an
actual timeline to track, it is overkill and we can replace it with a
much less grand plain list. We still need a list of requests inflight,
for the simple purpose of finding inflight requests (for retiring,
resetting, preemption etc).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190614164606.15633-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-06-14 17:46:06 +01:00
parent 9db0c5caa7
commit 422d7df4f0
16 changed files with 153 additions and 188 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpu/drm/i915/gt/intel_ringbuffer.c
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@@ -730,14 +730,13 @@ static void reset_prepare(struct intel_engine_cs *engine)
static void reset_ring(struct intel_engine_cs *engine, bool stalled)
{
struct i915_timeline *tl = &engine->timeline;
struct i915_request *pos, *rq;
unsigned long flags;
u32 head;
rq = NULL;
spin_lock_irqsave(&tl->lock, flags);
list_for_each_entry(pos, &tl->requests, link) {
spin_lock_irqsave(&engine->active.lock, flags);
list_for_each_entry(pos, &engine->active.requests, sched.link) {
if (!i915_request_completed(pos)) {
rq = pos;
break;
@@ -791,7 +790,7 @@ static void reset_ring(struct intel_engine_cs *engine, bool stalled)
}
engine->buffer->head = intel_ring_wrap(engine->buffer, head);
spin_unlock_irqrestore(&tl->lock, flags);
spin_unlock_irqrestore(&engine->active.lock, flags);
}
static void reset_finish(struct intel_engine_cs *engine)
@@ -877,10 +876,10 @@ static void cancel_requests(struct intel_engine_cs *engine)
struct i915_request *request;
unsigned long flags;
spin_lock_irqsave(&engine->timeline.lock, flags);
spin_lock_irqsave(&engine->active.lock, flags);
/* Mark all submitted requests as skipped. */
list_for_each_entry(request, &engine->timeline.requests, link) {
list_for_each_entry(request, &engine->active.requests, sched.link) {
if (!i915_request_signaled(request))
dma_fence_set_error(&request->fence, -EIO);
@@ -889,7 +888,7 @@ static void cancel_requests(struct intel_engine_cs *engine)
/* Remaining _unready_ requests will be nop'ed when submitted */
spin_unlock_irqrestore(&engine->timeline.lock, flags);
spin_unlock_irqrestore(&engine->active.lock, flags);
}
static void i9xx_submit_request(struct i915_request *request)
@@ -1267,8 +1266,6 @@ intel_engine_create_ring(struct intel_engine_cs *engine,
GEM_BUG_ON(!is_power_of_2(size));
GEM_BUG_ON(RING_CTL_SIZE(size) & ~RING_NR_PAGES);
GEM_BUG_ON(timeline == &engine->timeline);
lockdep_assert_held(&engine->i915->drm.struct_mutex);
ring = kzalloc(sizeof(*ring), GFP_KERNEL);
if (!ring)