> 2020年9月1日 21:54，Christian König <ckoenig.leichtzumer...@gmail.com> 写道：
>
> Agreed, that change doesn't seem to make sense and your backtrace is mangled
> so barely readable.
it is reply that messed up the logs.
And this patch was sent on 10th Feb.
>
> Christian.
>
> Am 01.09.20 um 14:59 schrieb Liu, Monk:
>> [AMD Official Use Only - Internal Distribution Only]
>>
>> See that we already have such logic:
>>
>> 282 static void amdgpu_vm_bo_relocated(struct amdgpu_vm_bo_base *vm_bo)
>> 283 {
>> 284 if (vm_bo->bo->parent)
>> 285 list_move(&vm_bo->vm_status, &vm_bo->vm->relocated);
>> 286 else
>> 287 amdgpu_vm_bo_idle(vm_bo);
>> 288 }
>>
>> Why you need to do the bo->parent check out side ?
because it is me that moves such logic into amdgpu_vm_bo_relocated.
>>
>> -----邮件原件-----
>> 发件人: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> 代表 Pan, Xinhui
>> 发送时间: 2020年2月10日 9:04
>> 收件人: amd-gfx@lists.freedesktop.org
>> 抄送: Deucher, Alexander <alexander.deuc...@amd.com>; Koenig, Christian
>> <christian.koe...@amd.com>
>> 主题: [PATCH V2] drm/amdgpu: Do not move root PT bo to relocated list
>>
>> hit panic when we update the page tables.
>>
>> <1>[ 122.103290] BUG: kernel NULL pointer dereference, address:
>> 0000000000000008 <1>[ 122.103348] #PF: supervisor read access in kernel
>> mode <1>[ 122.103376] #PF: error_code(0x0000) - not-present page <6>[
>> 122.103403] PGD 0 P4D 0 <4>[ 122.103421] Oops: 0000 [#1] SMP PTI
>> <4>[ 122.103442] CPU: 13 PID: 2133 Comm: kfdtest Tainted: G OE
>> 5.4.0-rc7+ #7
>> <4>[ 122.103480] Hardware name: Supermicro SYS-7048GR-TR/X10DRG-Q, BIOS
>> 3.0b 03/09/2018 <4>[ 122.103657] RIP:
>> 0010:amdgpu_vm_update_pdes+0x140/0x330 [amdgpu] <4>[ 122.103689] Code: 03
>> 4c 89 73 08 49 89 9d c8 00 00 00 48 8b 7b f0 c6 43 10 00 45 31 c0 48 8b 87
>> 28 04 00 00 48 85 c0 74 07 4c 8b 80 20 04 00 00 <4d> 8b 70 08 31 f6 49 8b 86
>> 28 04 00 00 48 85 c0 74 0f 48 8b 80 28 <4>[ 122.103769] RSP:
>> 0018:ffffb49a0a6a3a98 EFLAGS: 00010246 <4>[ 122.103797] RAX:
>> 0000000000000000 RBX: ffff9020f823c148 RCX: dead000000000122 <4>[
>> 122.103831] RDX: ffff9020ece70018 RSI: ffff9020f823c0c8 RDI:
>> ffff9010ca31c800 <4>[ 122.103865] RBP: ffffb49a0a6a3b38 R08:
>> 0000000000000000 R09: 0000000000000001 <4>[ 122.103899] R10:
>> 000000006044f994 R11: 00000000df57fb58 R12: ffff9020f823c000 <4>[
>> 122.103933] R13: ffff9020f823c000 R14: ffff9020f823c0c8 R15:
>> ffff9010d5d20000 <4>[ 122.103968] FS: 00007f32c83dc780(0000)
>> GS:ffff9020ff380000(0000) knlGS:0000000000000000 <4>[ 122.104006] CS: 0010
>> DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 122.104035] CR2:
>> 0000000000000008 CR3: 0000002036bba005 CR4: 00000000003606e0 <4>[
>> 122.104069] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
>> 0000000000000000 <4>[ 122.104103] DR3: 0000000000000000 DR6:
>> 00000000fffe0ff0 DR7: 0000000000000400 <4>[ 122.104137] Call Trace:
>> <4>[ 122.104241] vm_update_pds+0x31/0x50 [amdgpu] <4>[ 122.104347]
>> amdgpu_amdkfd_gpuvm_map_memory_to_gpu+0x2ef/0x690 [amdgpu] <4>[ 122.104466]
>> kfd_process_alloc_gpuvm+0x98/0x190 [amdgpu] <4>[ 122.104576]
>> kfd_process_device_init_vm.part.8+0xf3/0x1f0 [amdgpu] <4>[ 122.104688]
>> kfd_process_device_init_vm+0x24/0x30 [amdgpu] <4>[ 122.104794]
>> kfd_ioctl_acquire_vm+0xa4/0xc0 [amdgpu] <4>[ 122.104900]
>> kfd_ioctl+0x277/0x500 [amdgpu] <4>[ 122.105001] ?
>> kfd_ioctl_free_memory_of_gpu+0xc0/0xc0 [amdgpu] <4>[ 122.105039] ?
>> rcu_read_lock_sched_held+0x4f/0x80
>> <4>[ 122.105068] ? kmem_cache_free+0x2ba/0x300 <4>[ 122.105093] ?
>> vm_area_free+0x18/0x20 <4>[ 122.105117] ? find_held_lock+0x35/0xa0 <4>[
>> 122.105143] do_vfs_ioctl+0xa9/0x6f0 <4>[ 122.106001] ksys_ioctl+0x75/0x80
>> <4>[ 122.106802] ? do_syscall_64+0x17/0x230 <4>[ 122.107605]
>> __x64_sys_ioctl+0x1a/0x20 <4>[ 122.108378] do_syscall_64+0x5f/0x230 <4>[
>> 122.109118] entry_SYSCALL_64_after_hwframe+0x49/0xbe
>> <4>[ 122.109842] RIP: 0033:0x7f32c6b495d7
>>
>> Signed-off-by: xinhui pan <xinhui....@amd.com>
>> ---
>> change from v1:
>> move root pt bo to idle state instead.
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 9 ++++++---
>> 1 file changed, 6 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> index 3195bc9..c3d1af5 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> @@ -2619,9 +2619,12 @@ void amdgpu_vm_bo_invalidate(struct amdgpu_device
>> *adev,
>> continue;
>> bo_base->moved = true;
>>
>> -if (bo->tbo.type == ttm_bo_type_kernel)
>> -amdgpu_vm_bo_relocated(bo_base);
>> -else if (bo->tbo.base.resv == vm->root.base.bo->tbo.base.resv)
>> +if (bo->tbo.type == ttm_bo_type_kernel) {
>> +if (bo->parent)
>> +amdgpu_vm_bo_relocated(bo_base);
>> +else
>> +amdgpu_vm_bo_idle(bo_base);
>> +} else if (bo->tbo.base.resv == vm->root.base.bo->tbo.base.resv)
>> amdgpu_vm_bo_moved(bo_base);
>> else
>> amdgpu_vm_bo_invalidated(bo_base);
>> --
>> 2.7.4
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>
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