drm/doc: Reorg drm-mm.rst
- Readjust headings - we lost one level through the extraction into a separate .rst file. - Merge helper reference sections with the helper documentation - that split was just an artifact of the docbook toolchain sucking at too deep nesting levels. No such problems with sphinx. - Move the cma helpers in with the gem documentation, since they're helpers to implement gem using CMA/dma memory as a backend. Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1471034937-651-4-git-send-email-daniel.vetter@ffwll.chhifive-unleashed-5.1
Daniel Vetter
parent
1de72faf10
commit
8febdf0d59
|
|
@ -26,12 +26,12 @@ TTM, but has no video RAM management capabilities and is thus limited to
|
|||
UMA devices.
|
||||
|
||||
The Translation Table Manager (TTM)
|
||||
-----------------------------------
|
||||
===================================
|
||||
|
||||
TTM design background and information belongs here.
|
||||
|
||||
TTM initialization
|
||||
~~~~~~~~~~~~~~~~~~
|
||||
------------------
|
||||
|
||||
**Warning**
|
||||
|
||||
|
|
@ -77,7 +77,7 @@ object, ttm_global_item_ref() is used to create an initial reference
|
|||
count for the TTM, which will call your initialization function.
|
||||
|
||||
The Graphics Execution Manager (GEM)
|
||||
------------------------------------
|
||||
====================================
|
||||
|
||||
The GEM design approach has resulted in a memory manager that doesn't
|
||||
provide full coverage of all (or even all common) use cases in its
|
||||
|
|
@ -114,7 +114,7 @@ read & write, mapping, and domain ownership transfers are left to
|
|||
driver-specific ioctls.
|
||||
|
||||
GEM Initialization
|
||||
~~~~~~~~~~~~~~~~~~
|
||||
------------------
|
||||
|
||||
Drivers that use GEM must set the DRIVER_GEM bit in the struct
|
||||
:c:type:`struct drm_driver <drm_driver>` driver_features
|
||||
|
|
@ -132,7 +132,7 @@ typically not managed by GEM, and must be initialized separately into
|
|||
its own DRM MM object.
|
||||
|
||||
GEM Objects Creation
|
||||
~~~~~~~~~~~~~~~~~~~~
|
||||
--------------------
|
||||
|
||||
GEM splits creation of GEM objects and allocation of the memory that
|
||||
backs them in two distinct operations.
|
||||
|
|
@ -173,7 +173,7 @@ a call to :c:func:`drm_gem_private_object_init()` instead of
|
|||
must be managed by drivers.
|
||||
|
||||
GEM Objects Lifetime
|
||||
~~~~~~~~~~~~~~~~~~~~
|
||||
--------------------
|
||||
|
||||
All GEM objects are reference-counted by the GEM core. References can be
|
||||
acquired and release by :c:func:`calling
|
||||
|
|
@ -196,7 +196,7 @@ resources created by the GEM core, which need to be released with
|
|||
:c:func:`drm_gem_object_release()`.
|
||||
|
||||
GEM Objects Naming
|
||||
~~~~~~~~~~~~~~~~~~
|
||||
------------------
|
||||
|
||||
Communication between userspace and the kernel refers to GEM objects
|
||||
using local handles, global names or, more recently, file descriptors.
|
||||
|
|
@ -245,7 +245,7 @@ Furthermore PRIME also allows cross-device buffer sharing since it is
|
|||
based on dma-bufs.
|
||||
|
||||
GEM Objects Mapping
|
||||
~~~~~~~~~~~~~~~~~~~
|
||||
-------------------
|
||||
|
||||
Because mapping operations are fairly heavyweight GEM favours
|
||||
read/write-like access to buffers, implemented through driver-specific
|
||||
|
|
@ -304,7 +304,7 @@ Drivers that want to map the GEM object upfront instead of handling page
|
|||
faults can implement their own mmap file operation handler.
|
||||
|
||||
Memory Coherency
|
||||
~~~~~~~~~~~~~~~~
|
||||
----------------
|
||||
|
||||
When mapped to the device or used in a command buffer, backing pages for
|
||||
an object are flushed to memory and marked write combined so as to be
|
||||
|
|
@ -320,7 +320,7 @@ blocks the client and waits for rendering to complete before performing
|
|||
any necessary flushing operations).
|
||||
|
||||
Command Execution
|
||||
~~~~~~~~~~~~~~~~~
|
||||
-----------------
|
||||
|
||||
Perhaps the most important GEM function for GPU devices is providing a
|
||||
command execution interface to clients. Client programs construct
|
||||
|
|
@ -348,8 +348,20 @@ GEM Function Reference
|
|||
.. kernel-doc:: include/drm/drm_gem.h
|
||||
:internal:
|
||||
|
||||
GEM CMA Helper Functions Reference
|
||||
----------------------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_gem_cma_helper.c
|
||||
:doc: cma helpers
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_gem_cma_helper.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: include/drm/drm_gem_cma_helper.h
|
||||
:internal:
|
||||
|
||||
VMA Offset Manager
|
||||
------------------
|
||||
==================
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_vma_manager.c
|
||||
:doc: vma offset manager
|
||||
|
|
@ -361,14 +373,14 @@ VMA Offset Manager
|
|||
:internal:
|
||||
|
||||
PRIME Buffer Sharing
|
||||
--------------------
|
||||
====================
|
||||
|
||||
PRIME is the cross device buffer sharing framework in drm, originally
|
||||
created for the OPTIMUS range of multi-gpu platforms. To userspace PRIME
|
||||
buffers are dma-buf based file descriptors.
|
||||
|
||||
Overview and Driver Interface
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
-----------------------------
|
||||
|
||||
Similar to GEM global names, PRIME file descriptors are also used to
|
||||
share buffer objects across processes. They offer additional security:
|
||||
|
|
@ -406,7 +418,7 @@ struct drm_gem_object \*obj, int flags); struct drm_gem_object \*
|
|||
support PRIME.
|
||||
|
||||
PRIME Helper Functions
|
||||
~~~~~~~~~~~~~~~~~~~~~~
|
||||
----------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_prime.c
|
||||
:doc: PRIME Helpers
|
||||
|
|
@ -418,16 +430,16 @@ PRIME Function References
|
|||
:export:
|
||||
|
||||
DRM MM Range Allocator
|
||||
----------------------
|
||||
======================
|
||||
|
||||
Overview
|
||||
~~~~~~~~
|
||||
--------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_mm.c
|
||||
:doc: Overview
|
||||
|
||||
LRU Scan/Eviction Support
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
-------------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_mm.c
|
||||
:doc: lru scan roaster
|
||||
|
|
@ -440,15 +452,3 @@ DRM MM Range Allocator Function References
|
|||
|
||||
.. kernel-doc:: include/drm/drm_mm.h
|
||||
:internal:
|
||||
|
||||
CMA Helper Functions Reference
|
||||
------------------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_gem_cma_helper.c
|
||||
:doc: cma helpers
|
||||
|
||||
.. kernel-doc:: drivers/gpu/drm/drm_gem_cma_helper.c
|
||||
:export:
|
||||
|
||||
.. kernel-doc:: include/drm/drm_gem_cma_helper.h
|
||||
:internal:
|
||||
|
|
|
|||
Loading…
Reference in New Issue