Re: [Intel-gfx] [PATCH v3] drm/i915/active: Fix misuse of non-idle barriers as fence trackers
Hi Janusz,
Pushed to drm-intel-gt-next.
Thanks,
Andi
On Thu, Mar 02, 2023 at 01:08:20PM +0100, Janusz Krzysztofik wrote:
> Users reported oopses on list corruptions when using i915 perf with a
> number of concurrently running graphics applications. Root cause analysis
> pointed at an issue in barrier processing code -- a race among perf open /
> close replacing active barriers with perf requests on kernel context and
> concurrent barrier preallocate / acquire operations performed during user
> context first pin / last unpin.
>
> When adding a request to a composite tracker, we try to reuse an existing
> fence tracker, already allocated and registered with that composite. The
> tracker we obtain may already track another fence, may be an idle barrier,
> or an active barrier.
>
> If the tracker we get occurs a non-idle barrier then we try to delete that
> barrier from a list of barrier tasks it belongs to. However, while doing
> that we don't respect return value from a function that performs the
> barrier deletion. Should the deletion ever fail, we would end up reusing
> the tracker still registered as a barrier task. Since the same structure
> field is reused with both fence callback lists and barrier tasks list,
> list corruptions would likely occur.
>
> Barriers are now deleted from a barrier tasks list by temporarily removing
> the list content, traversing that content with skip over the node to be
> deleted, then populating the list back with the modified content. Should
> that intentionally racy concurrent deletion attempts be not serialized,
> one or more of those may fail because of the list being temporary empty.
>
> Related code that ignores the results of barrier deletion was initially
> introduced in v5.4 by commit d8af05ff38ae ("drm/i915: Allow sharing the
> idle-barrier from other kernel requests"). However, all users of the
> barrier deletion routine were apparently serialized at that time, then the
> issue didn't exhibit itself. Results of git bisect with help of a newly
> developed igt@gem_barrier_race@remote-request IGT test indicate that list
> corruptions might start to appear after commit 311770173fac ("drm/i915/gt:
> Schedule request retirement when timeline idles"), introduced in v5.5.
>
> Respect results of barrier deletion attempts -- mark the barrier as idle
> only if successfully deleted from the list. Then, before proceeding with
> setting our fence as the one currently tracked, make sure that the tracker
> we've got is not a non-idle barrier. If that check fails then don't use
> that tracker but go back and try to acquire a new, usable one.
>
> v3: use unlikely() to document what outcome we expect (Andi),
> - fix bad grammar in commit description.
> v2: no code changes,
> - blame commit 311770173fac ("drm/i915/gt: Schedule request retirement
> when timeline idles"), v5.5, not commit d8af05ff38ae ("drm/i915: Allow
> sharing the idle-barrier from other kernel requests"), v5.4,
> - reword commit description.
>
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6333
> Fixes: 311770173fac ("drm/i915/gt: Schedule request retirement when timeline
> idles")
> Cc: Chris Wilson
> Cc: sta...@vger.kernel.org # v5.5
> Cc: Andi Shyti
> Signed-off-by: Janusz Krzysztofik
> ---
> drivers/gpu/drm/i915/i915_active.c | 25 ++---
> 1 file changed, 14 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_active.c
> b/drivers/gpu/drm/i915/i915_active.c
> index 7412abf166a8c..a9fea115f2d26 100644
> --- a/drivers/gpu/drm/i915/i915_active.c
> +++ b/drivers/gpu/drm/i915/i915_active.c
> @@ -422,12 +422,12 @@ replace_barrier(struct i915_active *ref, struct
> i915_active_fence *active)
>* we can use it to substitute for the pending idle-barrer
>* request that we want to emit on the kernel_context.
>*/
> - __active_del_barrier(ref, node_from_active(active));
> - return true;
> + return __active_del_barrier(ref, node_from_active(active));
> }
>
> int i915_active_add_request(struct i915_active *ref, struct i915_request *rq)
> {
> + u64 idx = i915_request_timeline(rq)->fence_context;
> struct dma_fence *fence = >fence;
> struct i915_active_fence *active;
> int err;
> @@ -437,16 +437,19 @@ int i915_active_add_request(struct i915_active *ref,
> struct i915_request *rq)
> if (err)
> return err;
>
> - active = active_instance(ref, i915_request_timeline(rq)->fence_context);
> - if (!active) {
> - err = -ENOMEM;
> - goto out;
> - }
> + do {
> + active = active_instance(ref, idx);
> + if (!active) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + if (replace_barrier(ref, active)) {
> + RCU_INIT_POINTER(active->fence, NULL);
> + atomic_dec(>count);
> + }
> + } while
Re: [Intel-gfx] [PATCH v3] drm/i915/active: Fix misuse of non-idle barriers as fence trackers
Hi Janusz,
On Thu, Mar 02, 2023 at 01:08:20PM +0100, Janusz Krzysztofik wrote:
> Users reported oopses on list corruptions when using i915 perf with a
> number of concurrently running graphics applications. Root cause analysis
> pointed at an issue in barrier processing code -- a race among perf open /
> close replacing active barriers with perf requests on kernel context and
> concurrent barrier preallocate / acquire operations performed during user
> context first pin / last unpin.
>
> When adding a request to a composite tracker, we try to reuse an existing
> fence tracker, already allocated and registered with that composite. The
> tracker we obtain may already track another fence, may be an idle barrier,
> or an active barrier.
>
> If the tracker we get occurs a non-idle barrier then we try to delete that
> barrier from a list of barrier tasks it belongs to. However, while doing
> that we don't respect return value from a function that performs the
> barrier deletion. Should the deletion ever fail, we would end up reusing
> the tracker still registered as a barrier task. Since the same structure
> field is reused with both fence callback lists and barrier tasks list,
> list corruptions would likely occur.
>
> Barriers are now deleted from a barrier tasks list by temporarily removing
> the list content, traversing that content with skip over the node to be
> deleted, then populating the list back with the modified content. Should
> that intentionally racy concurrent deletion attempts be not serialized,
> one or more of those may fail because of the list being temporary empty.
>
> Related code that ignores the results of barrier deletion was initially
> introduced in v5.4 by commit d8af05ff38ae ("drm/i915: Allow sharing the
> idle-barrier from other kernel requests"). However, all users of the
> barrier deletion routine were apparently serialized at that time, then the
> issue didn't exhibit itself. Results of git bisect with help of a newly
> developed igt@gem_barrier_race@remote-request IGT test indicate that list
> corruptions might start to appear after commit 311770173fac ("drm/i915/gt:
> Schedule request retirement when timeline idles"), introduced in v5.5.
>
> Respect results of barrier deletion attempts -- mark the barrier as idle
> only if successfully deleted from the list. Then, before proceeding with
> setting our fence as the one currently tracked, make sure that the tracker
> we've got is not a non-idle barrier. If that check fails then don't use
> that tracker but go back and try to acquire a new, usable one.
>
> v3: use unlikely() to document what outcome we expect (Andi),
> - fix bad grammar in commit description.
> v2: no code changes,
> - blame commit 311770173fac ("drm/i915/gt: Schedule request retirement
> when timeline idles"), v5.5, not commit d8af05ff38ae ("drm/i915: Allow
> sharing the idle-barrier from other kernel requests"), v5.4,
> - reword commit description.
>
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6333
> Fixes: 311770173fac ("drm/i915/gt: Schedule request retirement when timeline
> idles")
> Cc: Chris Wilson
> Cc: sta...@vger.kernel.org # v5.5
> Cc: Andi Shyti
> Signed-off-by: Janusz Krzysztofik
Reviewed-by: Andi Shyti
I hope to see some future cleanups here, as well. Let's tie a
knot in our handkerchiefs to remind ourselves to revisit this in
the future.
Thanks,
Andi
[Intel-gfx] [PATCH v3] drm/i915/active: Fix misuse of non-idle barriers as fence trackers
Users reported oopses on list corruptions when using i915 perf with a
number of concurrently running graphics applications. Root cause analysis
pointed at an issue in barrier processing code -- a race among perf open /
close replacing active barriers with perf requests on kernel context and
concurrent barrier preallocate / acquire operations performed during user
context first pin / last unpin.
When adding a request to a composite tracker, we try to reuse an existing
fence tracker, already allocated and registered with that composite. The
tracker we obtain may already track another fence, may be an idle barrier,
or an active barrier.
If the tracker we get occurs a non-idle barrier then we try to delete that
barrier from a list of barrier tasks it belongs to. However, while doing
that we don't respect return value from a function that performs the
barrier deletion. Should the deletion ever fail, we would end up reusing
the tracker still registered as a barrier task. Since the same structure
field is reused with both fence callback lists and barrier tasks list,
list corruptions would likely occur.
Barriers are now deleted from a barrier tasks list by temporarily removing
the list content, traversing that content with skip over the node to be
deleted, then populating the list back with the modified content. Should
that intentionally racy concurrent deletion attempts be not serialized,
one or more of those may fail because of the list being temporary empty.
Related code that ignores the results of barrier deletion was initially
introduced in v5.4 by commit d8af05ff38ae ("drm/i915: Allow sharing the
idle-barrier from other kernel requests"). However, all users of the
barrier deletion routine were apparently serialized at that time, then the
issue didn't exhibit itself. Results of git bisect with help of a newly
developed igt@gem_barrier_race@remote-request IGT test indicate that list
corruptions might start to appear after commit 311770173fac ("drm/i915/gt:
Schedule request retirement when timeline idles"), introduced in v5.5.
Respect results of barrier deletion attempts -- mark the barrier as idle
only if successfully deleted from the list. Then, before proceeding with
setting our fence as the one currently tracked, make sure that the tracker
we've got is not a non-idle barrier. If that check fails then don't use
that tracker but go back and try to acquire a new, usable one.
v3: use unlikely() to document what outcome we expect (Andi),
- fix bad grammar in commit description.
v2: no code changes,
- blame commit 311770173fac ("drm/i915/gt: Schedule request retirement
when timeline idles"), v5.5, not commit d8af05ff38ae ("drm/i915: Allow
sharing the idle-barrier from other kernel requests"), v5.4,
- reword commit description.
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6333
Fixes: 311770173fac ("drm/i915/gt: Schedule request retirement when timeline
idles")
Cc: Chris Wilson
Cc: sta...@vger.kernel.org # v5.5
Cc: Andi Shyti
Signed-off-by: Janusz Krzysztofik
---
drivers/gpu/drm/i915/i915_active.c | 25 ++---
1 file changed, 14 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_active.c
b/drivers/gpu/drm/i915/i915_active.c
index 7412abf166a8c..a9fea115f2d26 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -422,12 +422,12 @@ replace_barrier(struct i915_active *ref, struct
i915_active_fence *active)
* we can use it to substitute for the pending idle-barrer
* request that we want to emit on the kernel_context.
*/
- __active_del_barrier(ref, node_from_active(active));
- return true;
+ return __active_del_barrier(ref, node_from_active(active));
}
int i915_active_add_request(struct i915_active *ref, struct i915_request *rq)
{
+ u64 idx = i915_request_timeline(rq)->fence_context;
struct dma_fence *fence = >fence;
struct i915_active_fence *active;
int err;
@@ -437,16 +437,19 @@ int i915_active_add_request(struct i915_active *ref,
struct i915_request *rq)
if (err)
return err;
- active = active_instance(ref, i915_request_timeline(rq)->fence_context);
- if (!active) {
- err = -ENOMEM;
- goto out;
- }
+ do {
+ active = active_instance(ref, idx);
+ if (!active) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ if (replace_barrier(ref, active)) {
+ RCU_INIT_POINTER(active->fence, NULL);
+ atomic_dec(>count);
+ }
+ } while (unlikely(is_barrier(active)));
- if (replace_barrier(ref, active)) {
- RCU_INIT_POINTER(active->fence, NULL);
- atomic_dec(>count);
- }
if (!__i915_active_fence_set(active, fence))
