Am 25.12.21 um 03:56 schrieb 周雪梅:
Although radeon card fence and wait for gpu to finish processing
current batch rings,
there is still a corner case that radeon lockup work queue may not be
fully flushed,
and meanwhile the radeon_suspend_kms() function has called
pci_set_power_state() to
put device in D3hot state.
Per PCI spec rev 4.0 on 5.3.1.4.1 D3hot State.
> Configuration and Message requests are the only TLPs accepted by a
Function in
> the D3hot state. All other received Requests must be handled as
Unsupported Requests,
> and all received Completions may optionally be handled as Unexpected
Completions.
Well first of all this is the completely wrong place for this. The flush
belongs into the fence code and not here.
Then I don't think that this is a good idea since it might cause deadlocks.
Christian.
This issue will happen in following logs:
1Unable to handle kernel paging request at virtual address
00008800e0008010
CPU 0 kworker/0:3(131): Oops 0
pc = [<ffffffff811bea5c>] ra = [<ffffffff81240844>] ps = 0000
Tainted: G W
pc is at si_gpu_check_soft_reset+0x3c/0x240
ra is at si_dma_is_lockup+0x34/0xd0
v0 = 0000000000000000 t0 = fff08800e0008010 t1 = 0000000000010000
t2 = 0000000000008010 t3 = fff00007e3c00000 t4 = fff00007e3c00258
t5 = 000000000000ffff t6 = 0000000000000001 t7 = fff00007ef078000
s0 = fff00007e3c016e8 s1 = fff00007e3c00000 s2 = fff00007e3c00018
s3 = fff00007e3c00000 s4 = fff00007fff59d80 s5 = 0000000000000000
s6 = fff00007ef07bd98
a0 = fff00007e3c00000 a1 = fff00007e3c016e8 a2 = 0000000000000008
a3 = 0000000000000001 a4 = 8f5c28f5c28f5c29 a5 = ffffffff810f4338
t8 = 0000000000000275 t9 = ffffffff809b66f8 t10 = ff6769c5d964b800
t11= 000000000000b886 pv = ffffffff811bea20 at = 0000000000000000
gp = ffffffff81d89690 sp = 00000000aa814126
4Disabling lock debugging due to kernel taint
Trace:
[<ffffffff81240844>] si_dma_is_lockup+0x34/0xd0
[<ffffffff81119610>] radeon_fence_check_lockup+0xd0/0x290
[<ffffffff80977010>] process_one_work+0x280/0x550
[<ffffffff80977350>] worker_thread+0x70/0x7c0
[<ffffffff80977410>] worker_thread+0x130/0x7c0
[<ffffffff80982040>] kthread+0x200/0x210
[<ffffffff809772e0>] worker_thread+0x0/0x7c0
[<ffffffff80981f8c>] kthread+0x14c/0x210
[<ffffffff80911658>] ret_from_kernel_thread+0x18/0x20
[<ffffffff80981e40>] kthread+0x0/0x210
Code: ad3e0008 43f0074a ad7e0018 ad9e0020 8c3001e8 40230101
<88210000> 4821ed21
So force lockup work queue flush to fix this problem.
Reviewed-by: Su Weiqiang <suweiqi...@wxiat.com>
Reviewed-by: Zhou Xuemei <zhouxue...@wxiat.com>
Signed-off-by: Xu Chenjiao <xuchenj...@wxiat.com>
---
drivers/gpu/drm/radeon/radeon_device.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_device.c
b/drivers/gpu/drm/radeon/radeon_device.c
index 59c8a6647ff2..cc1c07963116 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1625,6 +1625,9 @@ int radeon_suspend_kms(struct drm_device *dev,
bool suspend,
if (r) {
/* delay GPU reset to resume */
radeon_fence_driver_force_completion(rdev, i);
+} else {
+/* finish executing delayed work */
+flush_delayed_work(&rdev->fence_drv[i].lockup_work);
}
}
--
2.17.1
