[PATCH v4 08/14] drm/amdgpu: Fix a bunch of sdma code crash post device unplug

[Christian König]

Am 18.01.21 um 22:01 schrieb Andrey Grodzovsky:
> We can't allocate and submit IBs post device unplug.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index ad91c0c..5096351 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -31,6 +31,7 @@
>   #include <linux/dma-buf.h>
>   
>   #include <drm/amdgpu_drm.h>
> +#include <drm/drm_drv.h>
>   #include "amdgpu.h"
>   #include "amdgpu_trace.h"
>   #include "amdgpu_amdkfd.h"
> @@ -1604,7 +1605,10 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
>   	struct amdgpu_vm_update_params params;
>   	enum amdgpu_sync_mode sync_mode;
>   	uint64_t pfn;
> -	int r;
> +	int r, idx;
> +
> +	if (!drm_dev_enter(&adev->ddev, &idx))
> +		return -ENOENT;

Why not -ENODEV?

>   
>   	memset(&params, 0, sizeof(params));
>   	params.adev = adev;
> @@ -1647,6 +1651,8 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
>   	if (r)
>   		goto error_unlock;
>   
> +
> +	drm_dev_exit(idx);

That's to early. You probably need to do this much further below after 
the commit.

Christian.

>   	do {
>   		uint64_t tmp, num_entries, addr;
>