Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-03 17:41:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915: Drop rq->ring->vma peeking from error capture

Browse Source 
We only hold the active spinlock while dumping the error state, and this
does not prevent another thread from retiring the request -- as it is
quite possible that despite us capturing the current state, the GPU has
completed the request. As such, it is dangerous to dereference state
below the request as it may already be freed, and the simplest way to
avoid the danger is not include it in the error state.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1788
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200424191410.27570-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-04-24 20:14:10 +01:00
parent 9c878557b1
commit 9669a50799
2 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/i915/i915_gpu_error.c
View File

@ -467,14 +467,14 @@ static void error_print_request(struct drm_i915_error_state_buf *m,
if (!erq->seqno)
return;
err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, start %08x, head %08x, tail %08x\n",
err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
prefix, erq->pid, erq->context, erq->seqno,
test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
&erq->flags) ? "!" : "",
test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
&erq->flags) ? "+" : "",
erq->sched_attr.priority,
erq->start, erq->head, erq->tail);
erq->head, erq->tail);
}
static void error_print_context(struct drm_i915_error_state_buf *m,
@ -1213,7 +1213,6 @@ static void record_request(const struct i915_request *request,
erq->context = request->fence.context;
erq->seqno = request->fence.seqno;
erq->sched_attr = request->sched.attr;
erq->start = i915_ggtt_offset(request->ring->vma);
erq->head = request->head;
erq->tail = request->tail;

1
drivers/gpu/drm/i915/i915_gpu_error.h
View File

@ -50,7 +50,6 @@ struct i915_request_coredump {
pid_t pid;
u32 context;
u32 seqno;
u32 start;
u32 head;
u32 tail;
struct i915_sched_attr sched_attr;