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amdgpu: add a function to find bo by cpu mapping (v2) 

Userspace needs to know if the user memory is from BO or malloc.

v2: update mutex range and rebase

Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
main
Junwei Zhang 2018-08-08 17:56:46 +08:00 committed by Christian König
parent f49dccbb24
commit 4d454424e1
2 changed files with 62 additions and 0 deletions
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23
amdgpu/amdgpu.h
View File

@ -677,6 +677,29 @@ int amdgpu_create_bo_from_user_mem(amdgpu_device_handle dev,
void *cpu, uint64_t size,
amdgpu_bo_handle *buf_handle);
/**
* Validate if the user memory comes from BO
*
* \param dev - [in] Device handle. See #amdgpu_device_initialize()
* \param cpu - [in] CPU address of user allocated memory which we
* want to map to GPU address space (make GPU accessible)
* (This address must be correctly aligned).
* \param size - [in] Size of allocation (must be correctly aligned)
* \param buf_handle - [out] Buffer handle for the userptr memory
* if the user memory is not from BO, the buf_handle will be NULL.
* \param offset_in_bo - [out] offset in this BO for this user memory
*
*
* \return 0 on success\n
* <0 - Negative POSIX Error code
*
*/
int amdgpu_find_bo_by_cpu_mapping(amdgpu_device_handle dev,
void *cpu,
uint64_t size,
amdgpu_bo_handle *buf_handle,
uint64_t *offset_in_bo);
/**
* Free previosuly allocated memory
*

39
amdgpu/amdgpu_bo.c
View File

@ -529,6 +529,45 @@ int amdgpu_bo_wait_for_idle(amdgpu_bo_handle bo,
}
}
int amdgpu_find_bo_by_cpu_mapping(amdgpu_device_handle dev,
void *cpu,
uint64_t size,
amdgpu_bo_handle *buf_handle,
uint64_t *offset_in_bo)
{
int i;
struct amdgpu_bo *bo;
if (cpu == NULL || size == 0)
return -EINVAL;
/*
* Workaround for a buggy application which tries to import previously
* exposed CPU pointers. If we find a real world use case we should
* improve that by asking the kernel for the right handle.
*/
pthread_mutex_lock(&dev->bo_table_mutex);
for (i = 0; i < dev->bo_handles.max_key; i++) {
bo = handle_table_lookup(&dev->bo_handles, i);
if (!bo || !bo->cpu_ptr || size > bo->alloc_size)
continue;
if (cpu >= bo->cpu_ptr && cpu < (bo->cpu_ptr + bo->alloc_size))
break;
}
if (i < dev->bo_handles.max_key) {
atomic_inc(&bo->refcount);
*buf_handle = bo;
*offset_in_bo = cpu - bo->cpu_ptr;
} else {
*buf_handle = NULL;
*offset_in_bo = 0;
}
pthread_mutex_unlock(&dev->bo_table_mutex);
return 0;
}
int amdgpu_create_bo_from_user_mem(amdgpu_device_handle dev,
void *cpu,
uint64_t size,