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drm/vmwgfx: Look up user buffer objects without taking a reference

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Identically to how we look up ttm base objects witout reference, provide
the same functionality to vmw user buffer objects which derive from them.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
This commit is contained in:
Thomas Hellstrom 2018-09-26 16:03:57 +02:00
parent 64ad2abfe9
commit b733bc2e0a
2 changed files with 53 additions and 0 deletions
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41
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
View File

@ -921,6 +921,47 @@ int vmw_user_bo_lookup(struct ttm_object_file *tfile,
return 0;
}
/**
* vmw_user_bo_noref_lookup - Look up a vmw user buffer object without reference
* @tfile: The TTM object file the handle is registered with.
* @handle: The user buffer object handle.
*
* This function looks up a struct vmw_user_bo and returns a pointer to the
* struct vmw_buffer_object it derives from without refcounting the pointer.
* The returned pointer is only valid until vmw_user_bo_noref_release() is
* called, and the object pointed to by the returned pointer may be doomed.
* Any persistent usage of the object requires a refcount to be taken using
* ttm_bo_reference_unless_doomed(). Iff this function returns successfully it
* needs to be paired with vmw_user_bo_noref_release() and no sleeping-
* or scheduling functions may be called inbetween these function calls.
*
* Return: A struct vmw_buffer_object pointer if successful or negative
* error pointer on failure.
*/
struct vmw_buffer_object *
vmw_user_bo_noref_lookup(struct ttm_object_file *tfile, u32 handle)
{
struct vmw_user_buffer_object *vmw_user_bo;
struct ttm_base_object *base;
base = ttm_base_object_noref_lookup(tfile, handle);
if (!base) {
DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",
(unsigned long)handle);
return ERR_PTR(-ESRCH);
}
if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
ttm_base_object_noref_release();
DRM_ERROR("Invalid buffer object handle 0x%08lx.\n",
(unsigned long)handle);
return ERR_PTR(-EINVAL);
}
vmw_user_bo = container_of(base, struct vmw_user_buffer_object,
prime.base);
return &vmw_user_bo->vbo;
}
/**
* vmw_user_bo_reference - Open a handle to a vmw user buffer object.

12
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
View File

@ -772,6 +772,18 @@ extern void vmw_bo_unmap(struct vmw_buffer_object *vbo);
extern void vmw_bo_move_notify(struct ttm_buffer_object *bo,
struct ttm_mem_reg *mem);
extern void vmw_bo_swap_notify(struct ttm_buffer_object *bo);
extern struct vmw_buffer_object *
vmw_user_bo_noref_lookup(struct ttm_object_file *tfile, u32 handle);
/**
* vmw_user_bo_noref_release - release a buffer object pointer looked up
* without reference
*/
static inline void vmw_user_bo_noref_release(void)
{
ttm_base_object_noref_release();
}
/**
* Misc Ioctl functionality - vmwgfx_ioctl.c