[PATCH 07/60] drm/i915: Mark up protected uses of 'i915_request_completed'
Chris Wilson
chris at chris-wilson.co.uk
Sun Jan 10 12:29:09 UTC 2021
When we know that we are inside the timeline mutex, or inside the
submission flow (under active.lock or the holder's rcu lock), we know
that the rq->hwsp is stable and we can use the simpler direct version.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 2 +-
drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 4 ++--
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 2 +-
drivers/gpu/drm/i915/gt/intel_reset.c | 3 +--
drivers/gpu/drm/i915/gt/intel_ring_submission.c | 4 +++-
drivers/gpu/drm/i915/gt/intel_timeline.c | 4 ++--
drivers/gpu/drm/i915/i915_request.c | 15 +++++++--------
7 files changed, 17 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 68f58762d5e3..cac0c52fc681 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -408,7 +408,7 @@ __active_engine(struct i915_request *rq, struct intel_engine_cs **active)
}
if (i915_request_is_active(rq)) {
- if (!i915_request_completed(rq))
+ if (!__i915_request_is_complete(rq))
*active = locked;
ret = true;
}
diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
index be2c285a0ac7..d098fc0c14ec 100644
--- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c
@@ -517,8 +517,8 @@ static void print_signals(struct intel_breadcrumbs *b, struct drm_printer *p)
list_for_each_entry_rcu(rq, &ce->signals, signal_link)
drm_printf(p, "\t[%llx:%llx%s] @ %dms\n",
rq->fence.context, rq->fence.seqno,
- i915_request_completed(rq) ? "!" :
- i915_request_started(rq) ? "*" :
+ __i915_request_is_complete(rq) ? "!" :
+ __i915_request_has_started(rq) ? "*" :
"",
jiffies_to_msecs(jiffies - rq->emitted_jiffies));
}
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 1847d3c2ea99..e325d559f29a 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1792,7 +1792,7 @@ intel_engine_find_active_request(struct intel_engine_cs *engine)
struct intel_timeline *tl = request->context->timeline;
list_for_each_entry_from_reverse(request, &tl->requests, link) {
- if (i915_request_completed(request))
+ if (__i915_request_is_complete(request))
break;
active = request;
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 9d177297db79..bba385497d7b 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -151,8 +151,7 @@ static void mark_innocent(struct i915_request *rq)
void __i915_request_reset(struct i915_request *rq, bool guilty)
{
RQ_TRACE(rq, "guilty? %s\n", yesno(guilty));
-
- GEM_BUG_ON(i915_request_completed(rq));
+ GEM_BUG_ON(__i915_request_is_complete(rq));
rcu_read_lock(); /* protect the GEM context */
if (guilty) {
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 657afd8ebc14..c86ae77acc4e 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -405,12 +405,14 @@ static void reset_rewind(struct intel_engine_cs *engine, bool stalled)
rq = NULL;
spin_lock_irqsave(&engine->active.lock, flags);
+ rcu_read_lock();
list_for_each_entry(pos, &engine->active.requests, sched.link) {
- if (!i915_request_completed(pos)) {
+ if (!__i915_request_is_complete(pos)) {
rq = pos;
break;
}
}
+ rcu_read_unlock();
/*
* The guilty request will get skipped on a hung engine.
diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
index 7fe05918a76e..037b0e3ccbed 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -582,11 +582,11 @@ int intel_timeline_read_hwsp(struct i915_request *from,
rcu_read_lock();
cl = rcu_dereference(from->hwsp_cacheline);
- if (i915_request_completed(from)) /* confirm cacheline is valid */
+ if (i915_request_signaled(from)) /* confirm cacheline is valid */
goto unlock;
if (unlikely(!i915_active_acquire_if_busy(&cl->active)))
goto unlock; /* seqno wrapped and completed! */
- if (unlikely(i915_request_completed(from)))
+ if (unlikely(__i915_request_is_complete(from)))
goto release;
rcu_read_unlock();
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 0b1a46a0d866..7f273e2cf6d9 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -276,7 +276,7 @@ static void remove_from_engine(struct i915_request *rq)
bool i915_request_retire(struct i915_request *rq)
{
- if (!i915_request_completed(rq))
+ if (!__i915_request_is_complete(rq))
return false;
RQ_TRACE(rq, "\n");
@@ -342,8 +342,7 @@ void i915_request_retire_upto(struct i915_request *rq)
struct i915_request *tmp;
RQ_TRACE(rq, "\n");
-
- GEM_BUG_ON(!i915_request_completed(rq));
+ GEM_BUG_ON(!__i915_request_is_complete(rq));
do {
tmp = list_first_entry(&tl->requests, typeof(*tmp), link);
@@ -552,7 +551,7 @@ bool __i915_request_submit(struct i915_request *request)
* dropped upon retiring. (Otherwise if resubmit a *retired*
* request, this would be a horrible use-after-free.)
*/
- if (i915_request_completed(request))
+ if (__i915_request_is_complete(request))
goto xfer;
if (unlikely(intel_context_is_banned(request->context)))
@@ -652,7 +651,7 @@ void __i915_request_unsubmit(struct i915_request *request)
i915_request_cancel_breadcrumb(request);
/* We've already spun, don't charge on resubmitting. */
- if (request->sched.semaphores && i915_request_started(request))
+ if (request->sched.semaphores && __i915_request_has_started(request))
request->sched.semaphores = 0;
/*
@@ -864,7 +863,7 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
RCU_INIT_POINTER(rq->timeline, tl);
RCU_INIT_POINTER(rq->hwsp_cacheline, tl->hwsp_cacheline);
rq->hwsp_seqno = tl->hwsp_seqno;
- GEM_BUG_ON(i915_request_completed(rq));
+ GEM_BUG_ON(__i915_request_is_complete(rq));
rq->rcustate = get_state_synchronize_rcu(); /* acts as smp_mb() */
@@ -978,7 +977,7 @@ i915_request_await_start(struct i915_request *rq, struct i915_request *signal)
struct i915_request *prev;
/* Confirm signal has not been retired, the link is valid */
- if (unlikely(i915_request_started(signal)))
+ if (unlikely(__i915_request_has_started(signal)))
break;
/* Is signal the earliest request on its timeline? */
@@ -1520,7 +1519,7 @@ __i915_request_add_to_timeline(struct i915_request *rq)
*/
prev = to_request(__i915_active_fence_set(&timeline->last_request,
&rq->fence));
- if (prev && !i915_request_completed(prev)) {
+ if (prev && !__i915_request_is_complete(prev)) {
/*
* The requests are supposed to be kept in order. However,
* we need to be wary in case the timeline->last_request
--
2.20.1
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