FW: [PATCH] drm/ttm: fix ttm client driver (e.g. amdgpu) reload issue

Liu, Monk Monk.Liu at amd.com
Fri Jun 7 10:13:10 UTC 2019


Oh I know why,

My fix is to modify kobj_type's member "release" while upstream is doing the different way, but both of the way shall fix the issue

Thanks

/Monk

From: Deucher, Alexander
Sent: Thursday, June 6, 2019 11:16 PM
To: Koenig, Christian <Christian.Koenig at amd.com>; Liu, Monk <Monk.Liu at amd.com>; amd-gfx at lists.freedesktop.org
Subject: Re: FW: [PATCH] drm/ttm: fix ttm client driver (e.g. amdgpu) reload issue

It's upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bd4264112f93045704731850c5e4d85db981cd85
and in drm-next:
https://cgit.freedesktop.org/drm/drm/commit/?id=bd4264112f93045704731850c5e4d85db981cd85
and in amd-staging-drm-next:
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next&id=bd4264112f93045704731850c5e4d85db981cd85

Where are you seeing it missing?

Alex
________________________________
From: Christian K├Ânig <ckoenig.leichtzumerken at gmail.com<mailto:ckoenig.leichtzumerken at gmail.com>>
Sent: Thursday, June 6, 2019 10:00 AM
To: Koenig, Christian; Liu, Monk; amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>; Deucher, Alexander
Subject: Re: FW: [PATCH] drm/ttm: fix ttm client driver (e.g. amdgpu) reload issue

It is part of amd-staging-drm-next and has Alex Signed-of by tag.

So it should definitely be upstream, Alex any idea why that patch isn't
in drm-next?

Christian.

Am 05.06.19 um 20:10 schrieb Koenig, Christian:
> Mhm, looks like that somehow got dropped during rebase.
>
> Going to dig up where that actually ended up tomorrow.
>
> Christian.
>
> Am 05.06.19 um 16:44 schrieb Liu, Monk:
>> Strange, I get the latest "drm-next" branch and didn't see the change landed ....
>>
>> /Monk
>>
>> -----Original Message-----
>> From: Koenig, Christian
>> Sent: Wednesday, June 5, 2019 7:11 PM
>> To: Liu, Monk <Monk.Liu at amd.com<mailto:Monk.Liu at amd.com>>; amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>
>> Subject: Re: FW: [PATCH] drm/ttm: fix ttm client driver (e.g. amdgpu) reload issue
>>
>> This should already be fixed by patch "drm/ttm: fix re-init of global structures".
>>
>> Christian.
>>
>> Am 05.06.19 um 09:29 schrieb Liu, Monk:
>>> -----Original Message-----
>>> From: Monk Liu <Monk.Liu at amd.com<mailto:Monk.Liu at amd.com>>
>>> Sent: Wednesday, June 5, 2019 2:45 PM
>>> To: amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>
>>> Cc: Liu, Monk <Monk.Liu at amd.com<mailto:Monk.Liu at amd.com>>
>>> Subject: [PATCH] drm/ttm: fix ttm client driver (e.g. amdgpu) reload
>>> issue
>>>
>>> need to clear bo glob and mem glob during their release otherwise their member value would be wrongly used in the next glob init stage and lead to wild pointer access problems:
>>>
>>> 1) kobj.state_initialized is 1
>>> 2) ttm_bo_glob.bo_count isn't cleared and referenced via it
>>>       on member "swap_lru" would hit out of bound array accessing
>>>       bug
>>>
>>> Signed-off-by: Monk Liu <Monk.Liu at amd.com<mailto:Monk.Liu at amd.com>>
>>> ---
>>>     drivers/gpu/drm/ttm/ttm_bo.c     | 2 ++
>>>     drivers/gpu/drm/ttm/ttm_memory.c | 8 ++++++++
>>>     2 files changed, 10 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
>>> b/drivers/gpu/drm/ttm/ttm_bo.c index c7de667..6434eac 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>> @@ -1604,6 +1604,8 @@ static void ttm_bo_global_kobj_release(struct kobject *kobj)
>>>              container_of(kobj, struct ttm_bo_global, kobj);
>>>
>>>      __free_page(glob->dummy_read_page);
>>> +
>>> +   memset(glob, 0, sizeof(*glob));
>>>     }
>>>
>>>     static void ttm_bo_global_release(void) diff --git
>>> a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c
>>> index 8617958..7128bbf 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_memory.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_memory.c
>>> @@ -229,9 +229,17 @@ static const struct sysfs_ops ttm_mem_global_ops = {
>>>      .store = &ttm_mem_global_store,
>>>     };
>>>
>>> +void ttm_mem_glob_kobj_release(struct kobject *kobj) {
>>> +   struct ttm_mem_global *glob = container_of(kobj, struct
>>> +ttm_mem_global, kobj);
>>> +
>>> +   memset(glob, 0, sizeof(*glob));
>>> +}
>>> +
>>>     static struct kobj_type ttm_mem_glob_kobj_type = {
>>>      .sysfs_ops = &ttm_mem_global_ops,
>>>      .default_attrs = ttm_mem_global_attrs,
>>> +   .release = ttm_mem_glob_kobj_release,
>>>     };
>>>
>>>     static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
>>> --
>>> 2.7.4
>>>
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