回复： 回复： 回复： 回复： Bug: amdgpu drm driver cause process into Disk sleep state
yanhua
78666679 at qq.com
Wed Sep 11 02:43:26 UTC 2019
I'm leaving out for some days. Thanks very much for your detailed answer.
Best Regards.
Yanhua
------------------ 原始邮件 ------------------
发件人: "Koenig, Christian"<Christian.Koenig at amd.com>;
发送时间: 2019年9月6日(星期五) 晚上7:23
收件人: "yanhua"<78666679 at qq.com>;"amd-gfx"<amd-gfx at lists.freedesktop.org>;
抄送: "Deucher, Alexander"<Alexander.Deucher at amd.com>;
主题: Re: 回复： 回复： 回复： Bug: amdgpu drm driver cause process into Disk sleep state
Are there anything I have missed ?
Yeah, unfortunately quite a bunch of things. The fact that arm64 doesn't support the PCIe NoSnoop TLP attribute is only the tip of the iceberg.
You need a full "recent" driver stack, e.g. not older than a few month till a year, for this to work. And not only the kernel, but also recent userspace components.
Maybe that's something you could first, e.g. install a recent version of Mesa and/or tell Mesa to not use the SDMA at all. But since you are running into an SDMA lockup with a kernel triggered page table update I see little chance that this work.
The only other alternative I can see is the DKMS package of the pro-driver. With that one you might be able to compile the recent driver for an older kernel version.
But I can't guarantee at all that this actually works on ARM64.
Sorry that I don't have better news for you,
Christian.
Am 05.09.19 um 03:36 schrieb yanhua:
Hi, Christian,
I noticed that you said 'amdgpu is known to not work on arm64 until very recently'. I found the CPU related commit with drm is "drm: disable uncached DMA optimization for ARM and arm64".
@@ -47,6 +47,24 @@ static inline bool drm_arch_can_wc_memory(void)
return false;
#elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON3)
return false;
+#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+ /*
+ * The DRM driver stack is designed to work with cache coherent devices
+ * only, but permits an optimization to be enabled in some cases, where
+ * for some buffers, both the CPU and the GPU use uncached mappings,
+ * removing the need for DMA snooping and allocation in the CPU caches.
+ *
+ * The use of uncached GPU mappings relies on the correct implementation
+ * of the PCIe NoSnoop TLP attribute by the platform, otherwise the GPU
+ * will use cached mappings nonetheless. On x86 platforms, this does not
+ * seem to matter, as uncached CPU mappings will snoop the caches in any
+ * case. However, on ARM and arm64, enabling this optimization on a
+ * platform where NoSnoop is ignored results in loss of coherency, which
+ * breaks correct operation of the device. Since we have no way of
+ * detecting whether NoSnoop works or not, just disable this
+ * optimization entirely for ARM and arm64.
+ */
+ return false;
#else
return true;
#endif
The real effect is to in amdgpu_object.c
if (!drm_arch_can_wc_memory())
bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC;
And we have AMDGPU_GEM_CREATE_CPU_GTT_USWC turned off in our 4.19.36 kernel, So I think this is not the cause of my bug. Are there anything I have missed ?
I had suggest the machine supplier to use a more newer kernel such as 5.2.2, But they failed to do so after some try. We also backport a series patches from newer kernel. But still we get the bad ring timeout.
We have dived into the amdgpu drm driver a long time, bu it is really difficult for me, especially the hardware related ring timeout.
------------------
Yanhua
------------------ 原始邮件 ------------------
发件人: "Koenig, Christian"<Christian.Koenig at amd.com>;
发送时间: 2019年9月3日(星期二) 晚上9:19
收件人: "yanhua"<78666679 at qq.com>;"amd-gfx"<amd-gfx at lists.freedesktop.org>;
抄送: "Deucher, Alexander"<Alexander.Deucher at amd.com>;
主题: Re: 回复： 回复： Bug: amdgpu drm driver cause process into Disk sleep state
This is just a GPU lock, please open up a bug report on freedesktop.org and attach the full dmesg and which version of Mesa you are using.
Regards,
Christian.
Am 03.09.19 um 15:16 schrieb 78666679:
Yes, with dmesg|grep drm , I get following.
348571.880718] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring sdma1 timeout, signaled seq=24423862, emitted seq=24423865
------------------ 原始邮件 ------------------
发件人: "Koenig, Christian"<Christian.Koenig at amd.com>;
发送时间: 2019年9月3日(星期二) 晚上9:07
收件人: ""<78666679 at qq.com>;"amd-gfx"<amd-gfx at lists.freedesktop.org>;
抄送: "Deucher, Alexander"<Alexander.Deucher at amd.com>;
主题: Re: 回复： Bug: amdgpu drm driver cause process into Disk sleep state
Well that looks like the hardware got stuck.
Do you get something in the locks about a timeout on the SDMA ring?
Regards,
Christian.
Am 03.09.19 um 14:50 schrieb 78666679:
Hi Christian,
Sometimes the thread blocked disk sleeping in call to amdgpu_sa_bo_new. following is the stack trace. it seems the sa bo is used up , so the caller blocked waiting someone to free sa resources.
D 206833 227656 [surfaceflinger] <defunct> Binder:45_5
cat /proc/206833/task/227656/stack
[<0>] __switch_to+0x94/0xe8
[<0>] dma_fence_wait_any_timeout+0x234/0x2d0
[<0>] amdgpu_sa_bo_new+0x468/0x540 [amdgpu]
[<0>] amdgpu_ib_get+0x60/0xc8 [amdgpu]
[<0>] amdgpu_job_alloc_with_ib+0x70/0xb0 [amdgpu]
[<0>] amdgpu_vm_bo_update_mapping+0x2e0/0x3d8 [amdgpu]
[<0>] amdgpu_vm_bo_update+0x2a0/0x710 [amdgpu]
[<0>] amdgpu_gem_va_ioctl+0x46c/0x4c8 [amdgpu]
[<0>] drm_ioctl_kernel+0x94/0x118 [drm]
[<0>] drm_ioctl+0x1f0/0x438 [drm]
[<0>] amdgpu_drm_ioctl+0x58/0x90 [amdgpu]
[<0>] do_vfs_ioctl+0xc4/0x8c0
[<0>] ksys_ioctl+0x8c/0xa0
[<0>] __arm64_sys_ioctl+0x28/0x38
[<0>] el0_svc_common+0xa0/0x180
[<0>] el0_svc_handler+0x38/0x78
[<0>] el0_svc+0x8/0xc
[<0>] 0xffffffffffffffff
--------------------
YanHua
------------------ 原始邮件 ------------------
发件人: "Koenig, Christian"<Christian.Koenig at amd.com>;
发送时间: 2019年9月3日(星期二) 下午4:21
收件人: ""<78666679 at qq.com>;"amd-gfx"<amd-gfx at lists.freedesktop.org>;
抄送: "Deucher, Alexander"<Alexander.Deucher at amd.com>;
主题: Re: Bug: amdgpu drm driver cause process into Disk sleep state
Hi Yanhua,
please update your kernel first, cause that looks like a known issue
which was recently fixed by patch "drm/scheduler: use job count instead
of peek".
Probably best to try the latest bleeding edge kernel and if that doesn't
help please open up a bug report on https://bugs.freedesktop.org/.
Regards,
Christian.
Am 03.09.19 um 09:35 schrieb 78666679:
> Hi, Sirs:
> I have a wx5100 amdgpu card, It randomly come into failure. sometimes, it will cause processes into uninterruptible wait state.
>
>
> cps-new-ondemand-0587:~ # ps aux|grep -w D
> root 11268 0.0 0.0 260628 3516 ? Ssl 8月26 0:00 /usr/sbin/gssproxy -D
> root 136482 0.0 0.0 212500 572 pts/0 S+ 15:25 0:00 grep --color=auto -w D
> root 370684 0.0 0.0 17972 7428 ? Ss 9月02 0:04 /usr/sbin/sshd -D
> 10066 432951 0.0 0.0 0 0 ? D 9月02 0:00 [FakeFinalizerDa]
> root 496774 0.0 0.0 0 0 ? D 9月02 0:17 [kworker/8:1+eve]
> cps-new-ondemand-0587:~ # cat /proc/496774/stack
> [<0>] __switch_to+0x94/0xe8
> [<0>] drm_sched_entity_flush+0xf8/0x248 [gpu_sched]
> [<0>] amdgpu_ctx_mgr_entity_flush+0xac/0x148 [amdgpu]
> [<0>] amdgpu_flush+0x2c/0x50 [amdgpu]
> [<0>] filp_close+0x40/0xa0
> [<0>] put_files_struct+0x118/0x120
> [<0>] put_files_struct+0x30/0x68 [binder_linux]
> [<0>] binder_deferred_func+0x4d4/0x658 [binder_linux]
> [<0>] process_one_work+0x1b4/0x3f8
> [<0>] worker_thread+0x54/0x470
> [<0>] kthread+0x134/0x138
> [<0>] ret_from_fork+0x10/0x18
> [<0>] 0xffffffffffffffff
>
>
>
> This issue troubled me a long time. looking eagerly to get help from you!
>
>
> -----
> Yanhua
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