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drm/ttm: remove the outdated kerneldoc section

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Clean up to start over with new and more accurate documentation.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210908132933.3269-2-christian.koenig@amd.com
This commit is contained in:
Christian König 2021-09-03 13:43:12 +02:00
parent c5baa94487
commit b998ba95d2
1 changed files with 0 additions and 49 deletions
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Documentation/gpu/drm-mm.rst
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@ -30,55 +30,6 @@ The Translation Table Manager (TTM)
TTM design background and information belongs here.
TTM initialization
------------------
**Warning**
This section is outdated.
Drivers wishing to support TTM must pass a filled :c:type:`ttm_bo_driver
<ttm_bo_driver>` structure to ttm_bo_device_init, together with an
initialized global reference to the memory manager. The ttm_bo_driver
structure contains several fields with function pointers for
initializing the TTM, allocating and freeing memory, waiting for command
completion and fence synchronization, and memory migration.
The :c:type:`struct drm_global_reference <drm_global_reference>` is made
up of several fields:
.. code-block:: c
struct drm_global_reference {
enum ttm_global_types global_type;
size_t size;
void *object;
int (*init) (struct drm_global_reference *);
void (*release) (struct drm_global_reference *);
};
There should be one global reference structure for your memory manager
as a whole, and there will be others for each object created by the
memory manager at runtime. Your global TTM should have a type of
TTM_GLOBAL_TTM_MEM. The size field for the global object should be
sizeof(struct ttm_mem_global), and the init and release hooks should
point at your driver-specific init and release routines, which probably
eventually call ttm_mem_global_init and ttm_mem_global_release,
respectively.
Once your global TTM accounting structure is set up and initialized by
calling ttm_global_item_ref() on it, you need to create a buffer
object TTM to provide a pool for buffer object allocation by clients and
the kernel itself. The type of this object should be
TTM_GLOBAL_TTM_BO, and its size should be sizeof(struct
ttm_bo_global). Again, driver-specific init and release functions may
be provided, likely eventually calling ttm_bo_global_ref_init() and
ttm_bo_global_ref_release(), respectively. Also, like the previous
object, ttm_global_item_ref() is used to create an initial reference
count for the TTM, which will call your initialization function.
See the radeon_ttm.c file for an example of usage.
The Graphics Execution Manager (GEM)
====================================