[PATCH 04/52] drm/i915: Protect against request freeing during cancellation on wedging
Chris Wilson
chris at chris-wilson.co.uk
Sun Jan 31 05:43:01 UTC 2021
As soon as we mark a request as completed, it may be retired. So when
cancelling a request and marking it complete, make sure we first keep a
reference to the request.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
.../drm/i915/gt/intel_execlists_submission.c | 19 +++++++++++--------
drivers/gpu/drm/i915/gt/intel_reset.c | 14 ++++----------
.../gpu/drm/i915/gt/intel_ring_submission.c | 2 +-
drivers/gpu/drm/i915/gt/mock_engine.c | 8 +++++---
drivers/gpu/drm/i915/i915_request.c | 9 +++++++--
drivers/gpu/drm/i915/i915_request.h | 2 +-
6 files changed, 29 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index e7593df6777d..45a8ac152b88 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -2976,7 +2976,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
/* Mark all executing requests as skipped. */
list_for_each_entry(rq, &engine->active.requests, sched.link)
- i915_request_mark_eio(rq);
+ i915_request_put(i915_request_mark_eio(rq));
intel_engine_signal_breadcrumbs(engine);
/* Flush the queued requests to the timeline list (for retiring). */
@@ -2984,8 +2984,10 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
struct i915_priolist *p = to_priolist(rb);
priolist_for_each_request_consume(rq, rn, p) {
- i915_request_mark_eio(rq);
- __i915_request_submit(rq);
+ if (i915_request_mark_eio(rq)) {
+ __i915_request_submit(rq);
+ i915_request_put(rq);
+ }
}
rb_erase_cached(&p->node, &execlists->queue);
@@ -2994,7 +2996,7 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
/* On-hold requests will be flushed to timeline upon their release */
list_for_each_entry(rq, &engine->active.hold, sched.link)
- i915_request_mark_eio(rq);
+ i915_request_put(i915_request_mark_eio(rq));
/* Cancel all attached virtual engines */
while ((rb = rb_first_cached(&execlists->virtual))) {
@@ -3007,10 +3009,11 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
spin_lock(&ve->base.active.lock);
rq = fetch_and_zero(&ve->request);
if (rq) {
- i915_request_mark_eio(rq);
-
- rq->engine = engine;
- __i915_request_submit(rq);
+ if (i915_request_mark_eio(rq)) {
+ rq->engine = engine;
+ __i915_request_submit(rq);
+ i915_request_put(rq);
+ }
i915_request_put(rq);
ve->base.execlists.queue_priority_hint = INT_MIN;
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 107430e1e864..4d2509989d8f 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -786,18 +786,12 @@ static void reset_finish(struct intel_gt *gt, intel_engine_mask_t awake)
static void nop_submit_request(struct i915_request *request)
{
- struct intel_engine_cs *engine = request->engine;
- unsigned long flags;
-
RQ_TRACE(request, "-EIO\n");
- i915_request_set_error_once(request, -EIO);
- spin_lock_irqsave(&engine->active.lock, flags);
- __i915_request_submit(request);
- i915_request_mark_complete(request);
- spin_unlock_irqrestore(&engine->active.lock, flags);
-
- intel_engine_signal_breadcrumbs(engine);
+ request = i915_request_mark_eio(request);
+ i915_request_submit(request);
+ intel_engine_signal_breadcrumbs(request->engine);
+ i915_request_put(request);
}
static void __intel_gt_set_wedged(struct intel_gt *gt)
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 8b7cc637c432..9c2c605d7a92 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -400,7 +400,7 @@ static void reset_cancel(struct intel_engine_cs *engine)
/* Mark all submitted requests as skipped. */
list_for_each_entry(request, &engine->active.requests, sched.link)
- i915_request_mark_eio(request);
+ i915_request_put(i915_request_mark_eio(request));
intel_engine_signal_breadcrumbs(engine);
/* Remaining _unready_ requests will be nop'ed when submitted */
diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
index df7c1b1acc32..cf1269e74998 100644
--- a/drivers/gpu/drm/i915/gt/mock_engine.c
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -239,13 +239,15 @@ static void mock_reset_cancel(struct intel_engine_cs *engine)
/* Mark all submitted requests as skipped. */
list_for_each_entry(rq, &engine->active.requests, sched.link)
- i915_request_mark_eio(rq);
+ i915_request_put(i915_request_mark_eio(rq));
intel_engine_signal_breadcrumbs(engine);
/* Cancel and submit all pending requests. */
list_for_each_entry(rq, &mock->hw_queue, mock.link) {
- i915_request_mark_eio(rq);
- __i915_request_submit(rq);
+ if (i915_request_mark_eio(rq)) {
+ __i915_request_submit(rq);
+ i915_request_put(rq);
+ }
}
INIT_LIST_HEAD(&mock->hw_queue);
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index d66981b083cd..a336d6c40d8b 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -514,15 +514,20 @@ void i915_request_set_error_once(struct i915_request *rq, int error)
} while (!try_cmpxchg(&rq->fence.error, &old, error));
}
-void i915_request_mark_eio(struct i915_request *rq)
+struct i915_request *i915_request_mark_eio(struct i915_request *rq)
{
if (__i915_request_is_complete(rq))
- return;
+ return NULL;
GEM_BUG_ON(i915_request_signaled(rq));
+ /* As soon as the request is completed, it may be retired */
+ rq = i915_request_get(rq);
+
i915_request_set_error_once(rq, -EIO);
i915_request_mark_complete(rq);
+
+ return rq;
}
bool __i915_request_submit(struct i915_request *request)
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index 1bfe214a47e9..c0bd4cb8786a 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -311,7 +311,7 @@ i915_request_create(struct intel_context *ce);
void __i915_request_skip(struct i915_request *rq);
void i915_request_set_error_once(struct i915_request *rq, int error);
-void i915_request_mark_eio(struct i915_request *rq);
+struct i915_request *i915_request_mark_eio(struct i915_request *rq);
struct i915_request *__i915_request_commit(struct i915_request *request);
void __i915_request_queue(struct i915_request *rq,
--
2.20.1
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