diff options
| author | Vitaly Prosyak <vitaly.prosyak@amd.com> | 2023-01-20 22:03:45 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-02-03 23:41:27 +0300 |
| commit | 11cc4652e99f5529a9785b64f78fe005d8782b47 (patch) | |
| tree | 46ccc043cbf869890c0cdd34e8b8057e5f7cb90b /drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | |
| parent | febb414745d98f0a6f14d7fd53f1965a455e19d5 (diff) | |
| download | linux-11cc4652e99f5529a9785b64f78fe005d8782b47.tar.xz | |
drm/amdgpu: always sending PSP messages LOAD_ASD and UNLOAD_TA
We allow sending PSP messages LOAD_ASD and UNLOAD_TA without
acquiring a lock in drm_dev_enter during driver unload
because we must call drm_dev_unplug as the beginning
of unload driver sequence.
Added WARNING if other PSP messages are sent without a lock.
After this commit, the following commands would work
-sudo modprobe -r amdgpu
-sudo modprobe amdgpu
Signed-off-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Reviewed-by Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c index a8391f269cd0..40929f34447c 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c @@ -606,12 +606,21 @@ psp_cmd_submit_buf(struct psp_context *psp, int timeout = 20000; bool ras_intr = false; bool skip_unsupport = false; + bool dev_entered; if (psp->adev->no_hw_access) return 0; - if (!drm_dev_enter(adev_to_drm(psp->adev), &idx)) - return 0; + dev_entered = drm_dev_enter(adev_to_drm(psp->adev), &idx); + /* + * We allow sending PSP messages LOAD_ASD and UNLOAD_TA without acquiring + * a lock in drm_dev_enter during driver unload because we must call + * drm_dev_unplug as the beginning of unload driver sequence . It is very + * crucial that userspace can't access device instances anymore. + */ + if (!dev_entered) + WARN_ON(psp->cmd_buf_mem->cmd_id != GFX_CMD_ID_LOAD_ASD && + psp->cmd_buf_mem->cmd_id != GFX_CMD_ID_UNLOAD_TA); memset(psp->cmd_buf_mem, 0, PSP_CMD_BUFFER_SIZE); @@ -676,7 +685,8 @@ psp_cmd_submit_buf(struct psp_context *psp, } exit: - drm_dev_exit(idx); + if (dev_entered) + drm_dev_exit(idx); return ret; } |