[PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0

[Sheng, Wenhui]

[AMD Official Use Only - Internal Distribution Only]


[AMD Official Use Only - Internal Distribution Only]

Hmmmm....


  1.  There are some places in amdgpu driver using release_firmware like this way
  2.  This case is a little different, we use it in loop and maybe not all sdma instances' fw is initialized, just like we did in v5_2

Brs
Wenhui

From: Wang, Kevin(Yang) <Kevin1.Wang at amd.com>
Sent: Thursday, June 18, 2020 4:48 PM
To: Sheng, Wenhui <Wenhui.Sheng at amd.com>; amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0


[AMD Official Use Only - Internal Distribution Only]

afte the API firmware_realease created, the api logic never changed. (the first commit by Linus)
and you can use below command to reference the api usage case in our drm driver.

$ grep -nR "release_firmware" -A 5 -B 5 drivers/gpu/drm/ | vim -

Best Regards,
Kevin
________________________________
From: Sheng, Wenhui <Wenhui.Sheng at amd.com<mailto:Wenhui.Sheng at amd.com>>
Sent: Thursday, June 18, 2020 4:31 PM
To: Wang, Kevin(Yang) <Kevin1.Wang at amd.com<mailto:Kevin1.Wang at amd.com>>; amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org> <amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>>
Subject: RE: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0


[AMD Official Use Only - Internal Distribution Only]


[AMD Official Use Only - Internal Distribution Only]



Although we know that release_firmware has null check, but the code is not maintained by ourselves, so I think it's much more safe to add null  check before invoke release_firmware.





Brs

Wenhui

From: Wang, Kevin(Yang) <Kevin1.Wang at amd.com<mailto:Kevin1.Wang at amd.com>>
Sent: Thursday, June 18, 2020 4:25 PM
To: Sheng, Wenhui <Wenhui.Sheng at amd.com<mailto:Wenhui.Sheng at amd.com>>; amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>
Subject: Re: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0



[AMD Official Use Only - Internal Distribution Only]







________________________________

From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org<mailto:amd-gfx-bounces at lists.freedesktop.org>> on behalf of Wenhui Sheng <Wenhui.Sheng at amd.com<mailto:Wenhui.Sheng at amd.com>>
Sent: Thursday, June 18, 2020 3:53 PM
To: amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org> <amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>>
Cc: Sheng, Wenhui <Wenhui.Sheng at amd.com<mailto:Wenhui.Sheng at amd.com>>
Subject: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0



sdma v5_0 fw isn't released when module exit

Signed-off-by: Wenhui Sheng <Wenhui.Sheng at amd.com<mailto:Wenhui.Sheng at amd.com>>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
index 58d2a80af450..6751ad69ed90 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
@@ -1299,8 +1299,12 @@ static int sdma_v5_0_sw_fini(void *handle)
         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
         int i;

-       for (i = 0; i < adev->sdma.num_instances; i++)
+       for (i = 0; i < adev->sdma.num_instances; i++) {
+               if (adev->sdma.instance[i].fw != NULL)
+                       release_firmware(adev->sdma.instance[i].fw);

[kevin]:

the kernel api "release_firmware()" will check argument (is NULL pointer).

i think the patch don't need to double check it.

+
                 amdgpu_ring_fini(&adev->sdma.instance[i].ring);
+       }

         return 0;
 }
--
2.17.1

_______________________________________________
amd-gfx mailing list
amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org>
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=02%7C01%7CKevin1.Wang%40amd.com%7Cd0b8b72e0be443a7343d08d8135cb093%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637280636699912801&sdata=HrKVAmRO0HKFZBRG6oWq3thNlGBd0T9bMramDU1ijys%3D&reserved=0
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20200618/8351f58c/attachment-0001.htm>