We inspect the requests under the assumption that they will be marked as
completed/signaled when they are removed from the queue. Currently
however, in the process of wedging the requests will be removed from the
queue before they are completed, so rearrange the code to signal the
fences before the locks are dropped.
<1>[ 354.473346] BUG: unable to handle kernel NULL pointer dereference at 0000000000000250
<6>[ 354.473363] PGD 0 P4D 0
<4>[ 354.473370] Oops: 0000 [#1] PREEMPT SMP PTI
<4>[ 354.473380] CPU: 0 PID: 4470 Comm: gem_eio Tainted: G U 4.20.0-rc4-CI-CI_DRM_5216+ #1
<4>[ 354.473393] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, BIOS JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
<4>[ 354.473480] RIP: 0010:__i915_schedule+0x311/0x5e0 [i915]
<4>[ 354.473490] Code: 49 89 44 24 20 4d 89 4c 24 28 4d 89 29 44 39 b3 a0 04 00 00 7d 3a 41 8b 44 24 78 85 c0 74 13 48 8b 93 78 04 00 00 48 83 e2 fc <39> 82 50 02 00 00 79 1e 44 89 b3 a0 04 00 00 48 8d bb d0 03 00 00
<4>[ 354.473515] RSP: 0018:ffffc900001bba90 EFLAGS: 00010046
<4>[ 354.473524] RAX: 0000000000000003 RBX: ffff8882624c8008 RCX: f34a737800000000
<4>[ 354.473535] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8882624c8048
<4>[ 354.473545] RBP: ffffc900001bbab0 R08: 000000005963f1f1 R09: 0000000000000000
<4>[ 354.473556] R10: ffffc900001bba10 R11: ffff8882624c8060 R12: ffff88824fdd7b98
<4>[ 354.473567] R13: ffff88824fdd7bb8 R14: 0000000000000001 R15: ffff88824fdd7750
<4>[ 354.473578] FS: 00007f44b4b5b980(0000) GS:ffff888277e00000(0000) knlGS:0000000000000000
<4>[ 354.473590] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[ 354.473599] CR2: 0000000000000250 CR3: 000000026976e000 CR4: 0000000000340ef0
<4>[ 354.473611] Call Trace:
<4>[ 354.473622] ? lock_acquire+0xa6/0x1c0
<4>[ 354.473677] ? i915_schedule_bump_priority+0x57/0xd0 [i915]
<4>[ 354.473736] i915_schedule_bump_priority+0x72/0xd0 [i915]
<4>[ 354.473792] i915_request_wait+0x4db/0x840 [i915]
<4>[ 354.473804] ? get_pwq.isra.4+0x2c/0x50
<4>[ 354.473813] ? ___preempt_schedule+0x16/0x18
<4>[ 354.473824] ? wake_up_q+0x70/0x70
<4>[ 354.473831] ? wake_up_q+0x70/0x70
<4>[ 354.473882] ? gen6_rps_boost+0x118/0x120 [i915]
<4>[ 354.473936] i915_gem_object_wait_fence+0x8a/0x110 [i915]
<4>[ 354.473991] i915_gem_object_wait+0x113/0x500 [i915]
<4>[ 354.474047] i915_gem_wait_ioctl+0x11c/0x2f0 [i915]
<4>[ 354.474101] ? i915_gem_unset_wedged+0x210/0x210 [i915]
<4>[ 354.474113] drm_ioctl_kernel+0x81/0xf0
<4>[ 354.474123] drm_ioctl+0x2de/0x390
<4>[ 354.474175] ? i915_gem_unset_wedged+0x210/0x210 [i915]
<4>[ 354.474187] ? finish_task_switch+0x95/0x260
<4>[ 354.474197] ? lock_acquire+0xa6/0x1c0
<4>[ 354.474207] do_vfs_ioctl+0xa0/0x6e0
<4>[ 354.474217] ? __fget+0xfc/0x1e0
<4>[ 354.474225] ksys_ioctl+0x35/0x60
<4>[ 354.474233] __x64_sys_ioctl+0x11/0x20
<4>[ 354.474241] do_syscall_64+0x55/0x190
<4>[ 354.474251] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4>[ 354.474260] RIP: 0033:0x7f44b3de65d7
<4>[ 354.474267] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
<4>[ 354.474293] RSP: 002b:00007fff974948e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
<4>[ 354.474305] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f44b3de65d7
<4>[ 354.474316] RDX: 00007fff97494940 RSI: 00000000c010646c RDI: 0000000000000007
<4>[ 354.474327] RBP: 00007fff97494940 R08: 0000000000000000 R09: 00007f44b40bbc40
<4>[ 354.474337] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c010646c
<4>[ 354.474348] R13: 0000000000000007 R14: 0000000000000000 R15: 0000000000000000
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 15 +++------------
drivers/gpu/drm/i915/intel_lrc.c | 12 +++++++++++-
drivers/gpu/drm/i915/intel_ringbuffer.c | 7 ++++++-
3 files changed, 20 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c55b1f75c980..175ff54d302d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3330,6 +3330,8 @@ static void nop_complete_submit_request(struct i915_request *request)
__i915_request_submit(request);
intel_engine_init_global_seqno(request->engine, request->global_seqno);
spin_unlock_irqrestore(&request->engine->timeline.lock, flags);
+
+ dma_fence_signal(&request->fence);
}
void i915_gem_set_wedged(struct drm_i915_private *i915)
@@ -3392,19 +3394,8 @@ void i915_gem_set_wedged(struct drm_i915_private *i915)
synchronize_rcu();
for_each_engine(engine, i915, id) {
- unsigned long flags;
-
- /*
- * Mark all pending requests as complete so that any concurrent
- * (lockless) lookup doesn't try and wait upon the request as we
- * reset it.
- */
- spin_lock_irqsave(&engine->timeline.lock, flags);
- intel_engine_init_global_seqno(engine,
- intel_engine_last_submit(engine));
- spin_unlock_irqrestore(&engine->timeline.lock, flags);
-
i915_gem_reset_finish_engine(engine);
+ intel_engine_wakeup(engine);
}
out:
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 11f4e6148557..c0b8631dbe79 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -818,8 +818,13 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
/* Mark all executing requests as skipped. */
list_for_each_entry(rq, &engine->timeline.requests, link) {
GEM_BUG_ON(!rq->global_seqno);
- if (!i915_request_completed(rq))
+ if (!i915_request_completed(rq)) {
dma_fence_set_error(&rq->fence, -EIO);
+ intel_write_status_page(engine,
+ I915_GEM_HWS_INDEX,
+ rq->global_seqno);
+ }
+ dma_fence_signal(&rq->fence);
}
/* Flush the queued requests to the timeline list (for retiring). */
@@ -832,6 +837,11 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
dma_fence_set_error(&rq->fence, -EIO);
__i915_request_submit(rq);
+
+ intel_write_status_page(engine,
+ I915_GEM_HWS_INDEX,
+ rq->global_seqno);
+ dma_fence_signal(&rq->fence);
}
rb_erase_cached(&p->node, &execlists->queue);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e18a64d41843..384495919f5a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -750,8 +750,13 @@ static void cancel_requests(struct intel_engine_cs *engine)
/* Mark all submitted requests as skipped. */
list_for_each_entry(request, &engine->timeline.requests, link) {
GEM_BUG_ON(!request->global_seqno);
- if (!i915_request_completed(request))
+ if (!i915_request_completed(request)) {
dma_fence_set_error(&request->fence, -EIO);
+ intel_write_status_page(engine,
+ I915_GEM_HWS_INDEX,
+ request->global_seqno);
+ }
+ dma_fence_signal(&request->fence);
}
/* Remaining _unready_ requests will be nop'ed when submitted */
--
2.20.0.rc1
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