OK
-----Original Message-----
From: Chen, Guchun <Guchun.Chen@xxxxxxx>
Sent: Saturday, January 29, 2022 12:02 PM
To: Chai, Thomas <YiPeng.Chai@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Zhou1, Tao <Tao.Zhou1@xxxxxxx>; Zhang, Hawking <Hawking.Zhang@xxxxxxx>; Clements, John <John.Clements@xxxxxxx>; Chai, Thomas <YiPeng.Chai@xxxxxxx>; Chai, Thomas <YiPeng.Chai@xxxxxxx>
Subject: RE: [PATCH] drm/amdgpu: Add judgement to avoid infinite loop
[Public]
Please add a Fixes tag, as it should fix a regression from former patch.
Regards,
Guchun
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of yipechai
Sent: Saturday, January 29, 2022 11:53 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Zhou1, Tao <Tao.Zhou1@xxxxxxx>; Zhang, Hawking <Hawking.Zhang@xxxxxxx>; Clements, John <John.Clements@xxxxxxx>; Chai, Thomas <YiPeng.Chai@xxxxxxx>; Chai, Thomas <YiPeng.Chai@xxxxxxx>
Subject: [PATCH] drm/amdgpu: Add judgement to avoid infinite loop
1. The infinite loop causing soft lock occurs on multiple amdgpu cards
supporting ras feature.
2. This a workaround patch. It is valid for multiple amdgpu cards of the
same type.
3. The root cause is that each GPU card device has a separate .ras_list
link header, but the instance and linked list node of each ras block
are unique. When each device is initialized, each ras instance will
repeatedly add link node to the device every time. In this way, only
the .ras_list of the last initialized device is completely correct.
the .ras_list->prev and .ras_list->next of the device initialzied
before can still point to the correct ras instance, but the prev
pointer and next pointer of the pointed ras instance both point to
the last initialized device's .ras_ list instead of the beginning
.ras_ list. When using list_for_each_entry_safe searches for
non-existent Ras nodes on devices other than the last device, the
last ras instance next pointer cannot always be equal to the
beginning .ras_list, so that the loop cannot be terminated, the
program enters a infinite loop.
BTW: Since the data and initialization process of each card are the same,
the link list between ras instances will not be destroyed every time
the device is initialized.
4. The soft locked logs are as follows:
[ 262.165690] CPU: 93 PID: 758 Comm: kworker/93:1 Tainted: G OE 5.13.0-27-generic #29~20.04.1-Ubuntu
[ 262.165695] Hardware name: Supermicro AS -4124GS-TNR/H12DSG-O-CPU, BIOS T20200717143848 07/17/2020 [ 262.165698] Workqueue: events amdgpu_ras_do_recovery [amdgpu] [ 262.165980] RIP: 0010:amdgpu_ras_get_ras_block+0x86/0xd0 [amdgpu] [ 262.166239] Code: 68 d8 4c 8d 71 d8 48 39 c3 74 54 49 8b 45 38 48 85 c0 74 32 44 89 fa 44 89 e6 4c 89 ef e8 82 e4 9b dc 85 c0 74 3c 49 8b 46 28 <49> 8d 56 28 4d 89 f5 48 83 e8 28 48 39 d3 74 25 49 89 c6 49 8b 45 [ 262.166243] RSP: 0018:ffffac908fa87d80 EFLAGS: 00000202 [ 262.166247] RAX: ffffffffc1394248 RBX: ffff91e4ab8d6e20 RCX: ffffffffc1394248 [ 262.166249] RDX: ffff91e4aa356e20 RSI: 000000000000000e RDI: ffff91e4ab8c0000 [ 262.166252] RBP: ffffac908fa87da8 R08: 0000000000000007 R09: 0000000000000001 [ 262.166254] R10: ffff91e4930b64ec R11: 0000000000000000 R12: 000000000000000e [ 262.166256] R13: ffff91e4aa356df8 R14: ffffffffc1394320 R15: 0000000000000003 [ 262.166258] FS: 0000000000000000(0000) GS:ffff92238fb40000(0000) knlGS:0000000000000000 [ 262.166261] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 262.166264] CR2: 00000001004865d0 CR3: 000000406d796000 CR4: 0000000000350ee0 [ 262.166267] Call Trace:
[ 262.166272] amdgpu_ras_do_recovery+0x130/0x290 [amdgpu] [ 262.166529] ? psi_task_switch+0xd2/0x250 [ 262.166537] ? __switch_to+0x11d/0x460 [ 262.166542] ? __switch_to_asm+0x36/0x70 [ 262.166549] process_one_work+0x220/0x3c0 [ 262.166556] worker_thread+0x4d/0x3f0 [ 262.166560] ? process_one_work+0x3c0/0x3c0 [ 262.166563] kthread+0x12b/0x150 [ 262.166568] ? set_kthread_struct+0x40/0x40 [ 262.166571] ret_from_fork+0x22/0x30
Signed-off-by: yipechai <YiPeng.Chai@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index d4e07d0acb66..3d533ef0783d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -884,6 +884,7 @@ static int amdgpu_ras_block_match_default(struct amdgpu_ras_block_object *block_ static struct amdgpu_ras_block_object *amdgpu_ras_get_ras_block(struct amdgpu_device *adev,
enum amdgpu_ras_block block, uint32_t sub_block_index) {
+ int loop_cnt = 0;
struct amdgpu_ras_block_object *obj, *tmp;
if (block >= AMDGPU_RAS_BLOCK__LAST)
@@ -900,6 +901,9 @@ static struct amdgpu_ras_block_object *amdgpu_ras_get_ras_block(struct amdgpu_de
if (amdgpu_ras_block_match_default(obj, block) == 0)
return obj;
}
+
+ if (++loop_cnt >= AMDGPU_RAS_BLOCK__LAST)
+ break;
}
return NULL;
--
2.25.1
