[PATCH] Revert "drm/sched: Use parent fence instead of finished"

[hongchengwen]

From: Dave Airlie <airlied at redhat.com>

This reverts commit e4dc45b1848bc6bcac31eb1b4ccdd7f6718b3c86.

This is causing instability on Linus' desktop, and I'm seeing
oops with VK CTS runs.

netconsole got me the following oops:
[ 1234.778760] BUG: kernel NULL pointer dereference, address: 0000000000000088
[ 1234.778782] #PF: supervisor read access in kernel mode
[ 1234.778787] #PF: error_code(0x0000) - not-present page
[ 1234.778791] PGD 0 P4D 0
[ 1234.778798] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 1234.778803] CPU: 7 PID: 805 Comm: systemd-journal Not tainted 6.0.0+ #2
[ 1234.778809] Hardware name: System manufacturer System Product
Name/PRIME X370-PRO, BIOS 5603 07/28/2020
[ 1234.778813] RIP: 0010:drm_sched_job_done.isra.0+0xc/0x140 [gpu_sched]
[ 1234.778828] Code: aa 0f 1d ce e9 57 ff ff ff 48 89 d7 e8 9d 8f 3f
ce e9 4a ff ff ff 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 54 55 53
48 89 fb <48> 8b af 88 00 00 00 f0 ff 8d f0 00 00 00 48 8b 85 80 01 00
00 f0
[ 1234.778834] RSP: 0000:ffffabe680380de0 EFLAGS: 00010087
[ 1234.778839] RAX: ffffffffc04e9230 RBX: 0000000000000000 RCX: 0000000000000018
[ 1234.778897] RDX: 00000ba278e8977a RSI: ffff953fb288b460 RDI: 0000000000000000
[ 1234.778901] RBP: ffff953fb288b598 R08: 00000000000000e0 R09: ffff953fbd98b808
[ 1234.778905] R10: 0000000000000000 R11: ffffabe680380ff8 R12: ffffabe680380e00
[ 1234.778908] R13: 0000000000000001 R14: 00000000ffffffff R15: ffff953fbd9ec458
[ 1234.778912] FS:  00007f35e7008580(0000) GS:ffff95428ebc0000(0000)
knlGS:0000000000000000
[ 1234.778916] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1234.778919] CR2: 0000000000000088 CR3: 000000010147c000 CR4: 00000000003506e0
[ 1234.778924] Call Trace:
[ 1234.778981]  <IRQ>
[ 1234.778989]  dma_fence_signal_timestamp_locked+0x6a/0xe0
[ 1234.778999]  dma_fence_signal+0x2c/0x50
[ 1234.779005]  amdgpu_fence_process+0xc8/0x140 [amdgpu]
[ 1234.779234]  sdma_v3_0_process_trap_irq+0x70/0x80 [amdgpu]
[ 1234.779395]  amdgpu_irq_dispatch+0xa9/0x1d0 [amdgpu]
[ 1234.779609]  amdgpu_ih_process+0x80/0x100 [amdgpu]
[ 1234.779783]  amdgpu_irq_handler+0x1f/0x60 [amdgpu]
[ 1234.779940]  __handle_irq_event_percpu+0x46/0x190
[ 1234.779946]  handle_irq_event+0x34/0x70
[ 1234.779949]  handle_edge_irq+0x9f/0x240
[ 1234.779954]  __common_interrupt+0x66/0x100
[ 1234.779960]  common_interrupt+0xa0/0xc0
[ 1234.779965]  </IRQ>
[ 1234.779968]  <TASK>
[ 1234.779971]  asm_common_interrupt+0x22/0x40
[ 1234.779976] RIP: 0010:finish_mkwrite_fault+0x22/0x110
[ 1234.779981] Code: 1f 84 00 00 00 00 00 90 0f 1f 44 00 00 41 55 41
54 55 48 89 fd 53 48 8b 07 f6 40 50 08 0f 84 eb 00 00 00 48 8b 45 30
48 8b 18 <48> 89 df e8 66 bd ff ff 48 85 c0 74 0d 48 89 c2 83 e2 01 48
83 ea
[ 1234.779985] RSP: 0000:ffffabe680bcfd78 EFLAGS: 00000202

Revert it for now and figure it out later.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 4f2395d..e5a4ecd 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -829,7 +829,7 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
        job = list_first_entry_or_null(&sched->pending_list,
                                       struct drm_sched_job, list);

-       if (job && dma_fence_is_signaled(job->s_fence->parent)) {
+       if (job && dma_fence_is_signaled(&job->s_fence->finished)) {
                /* remove job from pending_list */
                list_del_init(&job->list);

@@ -841,7 +841,7 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)

                if (next) {
                        next->s_fence->scheduled.timestamp =
-                               job->s_fence->parent->timestamp;
+                               job->s_fence->finished.timestamp;
                        /* start TO timer for next job */
                        drm_sched_start_timeout(sched);
                }
--
2.7.4

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