On 12/07/17 02:37 PM, Felix Kuehling wrote:
> Any comments on this one?
>
> This was requested by the HSA runtime team a long time ago as a
> debugging feature. It allows gdb to access the content of CPU-mapped
> BOs. I imagine this may be useful for user mode driver developers.
Adding the dri-devel list.
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> index 15148f1..3f927c2 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> @@ -1237,6 +1237,134 @@ void amdgpu_ttm_set_active_vram_size(struct
>> amdgpu_device *adev, u64 size)
>> man->size = size >> PAGE_SHIFT;
>> }
>>
>> +static struct vm_operations_struct amdgpu_ttm_vm_ops;
>> +static const struct vm_operations_struct *ttm_vm_ops /* = NULL;
>> + * (appease checkpatch) */;
How does this appease checkpatch?
>> +static int amdgpu_ttm_bo_access_kmap(struct amdgpu_bo *abo,
>> + unsigned long offset,
>> + void *buf, int len, int write)
>> +{
>> + struct ttm_buffer_object *bo = &abo->tbo;
>> + struct ttm_bo_kmap_obj map;
>> + void *ptr;
>> + bool is_iomem;
>> + int r;
>> +
>> + r = ttm_bo_kmap(bo, 0, bo->num_pages, &map);
>> + if (r)
>> + return r;
>> + ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset;
>> + WARN_ON(is_iomem);
>> + if (write)
>> + memcpy(ptr, buf, len);
>> + else
>> + memcpy(buf, ptr, len);
>> + ttm_bo_kunmap(&map);
>> +
>> + return len;
>> +}
This could be in TTM, right? As a helper function and/or a generic
vm_operations_struct::access hook (at least for GTT/CPU domains).
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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