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![Danilo Krummrich](/assets/img/avatar_default.png)
Rename "GEM CMA" helpers to "GEM DMA" helpers - considering the
hierarchy of APIs (mm/cma -> dma -> gem dma) calling them "GEM
DMA" seems to be more applicable.
Besides that, commit e57924d4ae
("drm/doc: Task to rename CMA helpers")
requests to rename the CMA helpers and implies that people seem to be
confused about the naming.
In order to do this renaming the following script was used:
```
#!/bin/bash
DIRS="drivers/gpu include/drm Documentation/gpu"
REGEX_SYM_UPPER="[0-9A-Z_\-]"
REGEX_SYM_LOWER="[0-9a-z_\-]"
REGEX_GREP_UPPER="(${REGEX_SYM_UPPER}*)(GEM)_CMA_(${REGEX_SYM_UPPER}*)"
REGEX_GREP_LOWER="(${REGEX_SYM_LOWER}*)(gem)_cma_(${REGEX_SYM_LOWER}*)"
REGEX_SED_UPPER="s/${REGEX_GREP_UPPER}/\1\2_DMA_\3/g"
REGEX_SED_LOWER="s/${REGEX_GREP_LOWER}/\1\2_dma_\3/g"
# Find all upper case 'CMA' symbols and replace them with 'DMA'.
for ff in $(grep -REHl "${REGEX_GREP_UPPER}" $DIRS)
do
sed -i -E "$REGEX_SED_UPPER" $ff
done
# Find all lower case 'cma' symbols and replace them with 'dma'.
for ff in $(grep -REHl "${REGEX_GREP_LOWER}" $DIRS)
do
sed -i -E "$REGEX_SED_LOWER" $ff
done
# Replace all occurrences of 'CMA' / 'cma' in comments and
# documentation files with 'DMA' / 'dma'.
for ff in $(grep -RiHl " cma " $DIRS)
do
sed -i -E "s/ cma / dma /g" $ff
sed -i -E "s/ CMA / DMA /g" $ff
done
# Rename all 'cma_obj's to 'dma_obj'.
for ff in $(grep -RiHl "cma_obj" $DIRS)
do
sed -i -E "s/cma_obj/dma_obj/g" $ff
done
```
Only a few more manual modifications were needed, e.g. reverting the
following modifications in some DRM Kconfig files
- select CMA if HAVE_DMA_CONTIGUOUS
+ select DMA if HAVE_DMA_CONTIGUOUS
as well as manually picking the occurrences of 'CMA'/'cma' in comments and
documentation which relate to "GEM CMA", but not "FB CMA".
Also drivers/gpu/drm/Makefile was fixed up manually after renaming
drm_gem_cma_helper.c to drm_gem_dma_helper.c.
This patch is compile-time tested building a x86_64 kernel with
`make allyesconfig && make drivers/gpu/drm`.
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> #drivers/gpu/drm/arm
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220802000405.949236-4-dakr@redhat.com
515 lines
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=====================
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DRM Memory Management
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=====================
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Modern Linux systems require large amount of graphics memory to store
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frame buffers, textures, vertices and other graphics-related data. Given
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the very dynamic nature of many of that data, managing graphics memory
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efficiently is thus crucial for the graphics stack and plays a central
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role in the DRM infrastructure.
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The DRM core includes two memory managers, namely Translation Table Manager
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(TTM) and Graphics Execution Manager (GEM). TTM was the first DRM memory
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manager to be developed and tried to be a one-size-fits-them all
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solution. It provides a single userspace API to accommodate the need of
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all hardware, supporting both Unified Memory Architecture (UMA) devices
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and devices with dedicated video RAM (i.e. most discrete video cards).
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This resulted in a large, complex piece of code that turned out to be
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hard to use for driver development.
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GEM started as an Intel-sponsored project in reaction to TTM's
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complexity. Its design philosophy is completely different: instead of
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providing a solution to every graphics memory-related problems, GEM
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identified common code between drivers and created a support library to
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share it. GEM has simpler initialization and execution requirements than
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TTM, but has no video RAM management capabilities and is thus limited to
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UMA devices.
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The Translation Table Manager (TTM)
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===================================
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.. kernel-doc:: drivers/gpu/drm/ttm/ttm_module.c
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:doc: TTM
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.. kernel-doc:: include/drm/ttm/ttm_caching.h
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:internal:
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TTM device object reference
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---------------------------
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.. kernel-doc:: include/drm/ttm/ttm_device.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/ttm/ttm_device.c
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:export:
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TTM resource placement reference
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--------------------------------
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.. kernel-doc:: include/drm/ttm/ttm_placement.h
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:internal:
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TTM resource object reference
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-----------------------------
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.. kernel-doc:: include/drm/ttm/ttm_resource.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/ttm/ttm_resource.c
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:export:
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TTM TT object reference
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-----------------------
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.. kernel-doc:: include/drm/ttm/ttm_tt.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/ttm/ttm_tt.c
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:export:
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TTM page pool reference
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-----------------------
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.. kernel-doc:: include/drm/ttm/ttm_pool.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/ttm/ttm_pool.c
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:export:
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The Graphics Execution Manager (GEM)
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====================================
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The GEM design approach has resulted in a memory manager that doesn't
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provide full coverage of all (or even all common) use cases in its
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userspace or kernel API. GEM exposes a set of standard memory-related
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operations to userspace and a set of helper functions to drivers, and
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let drivers implement hardware-specific operations with their own
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private API.
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The GEM userspace API is described in the `GEM - the Graphics Execution
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Manager <http://lwn.net/Articles/283798/>`__ article on LWN. While
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slightly outdated, the document provides a good overview of the GEM API
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principles. Buffer allocation and read and write operations, described
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as part of the common GEM API, are currently implemented using
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driver-specific ioctls.
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GEM is data-agnostic. It manages abstract buffer objects without knowing
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what individual buffers contain. APIs that require knowledge of buffer
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contents or purpose, such as buffer allocation or synchronization
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primitives, are thus outside of the scope of GEM and must be implemented
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using driver-specific ioctls.
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On a fundamental level, GEM involves several operations:
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- Memory allocation and freeing
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- Command execution
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- Aperture management at command execution time
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Buffer object allocation is relatively straightforward and largely
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provided by Linux's shmem layer, which provides memory to back each
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object.
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Device-specific operations, such as command execution, pinning, buffer
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read & write, mapping, and domain ownership transfers are left to
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driver-specific ioctls.
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GEM Initialization
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------------------
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Drivers that use GEM must set the DRIVER_GEM bit in the struct
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:c:type:`struct drm_driver <drm_driver>` driver_features
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field. The DRM core will then automatically initialize the GEM core
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before calling the load operation. Behind the scene, this will create a
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DRM Memory Manager object which provides an address space pool for
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object allocation.
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In a KMS configuration, drivers need to allocate and initialize a
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command ring buffer following core GEM initialization if required by the
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hardware. UMA devices usually have what is called a "stolen" memory
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region, which provides space for the initial framebuffer and large,
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contiguous memory regions required by the device. This space is
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typically not managed by GEM, and must be initialized separately into
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its own DRM MM object.
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GEM Objects Creation
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--------------------
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GEM splits creation of GEM objects and allocation of the memory that
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backs them in two distinct operations.
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GEM objects are represented by an instance of struct :c:type:`struct
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drm_gem_object <drm_gem_object>`. Drivers usually need to
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extend GEM objects with private information and thus create a
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driver-specific GEM object structure type that embeds an instance of
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struct :c:type:`struct drm_gem_object <drm_gem_object>`.
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To create a GEM object, a driver allocates memory for an instance of its
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specific GEM object type and initializes the embedded struct
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:c:type:`struct drm_gem_object <drm_gem_object>` with a call
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to drm_gem_object_init(). The function takes a pointer
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to the DRM device, a pointer to the GEM object and the buffer object
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size in bytes.
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GEM uses shmem to allocate anonymous pageable memory.
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drm_gem_object_init() will create an shmfs file of the
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requested size and store it into the struct :c:type:`struct
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drm_gem_object <drm_gem_object>` filp field. The memory is
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used as either main storage for the object when the graphics hardware
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uses system memory directly or as a backing store otherwise.
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Drivers are responsible for the actual physical pages allocation by
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calling shmem_read_mapping_page_gfp() for each page.
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Note that they can decide to allocate pages when initializing the GEM
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object, or to delay allocation until the memory is needed (for instance
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when a page fault occurs as a result of a userspace memory access or
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when the driver needs to start a DMA transfer involving the memory).
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Anonymous pageable memory allocation is not always desired, for instance
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when the hardware requires physically contiguous system memory as is
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often the case in embedded devices. Drivers can create GEM objects with
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no shmfs backing (called private GEM objects) by initializing them with a call
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to drm_gem_private_object_init() instead of drm_gem_object_init(). Storage for
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private GEM objects must be managed by drivers.
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GEM Objects Lifetime
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--------------------
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All GEM objects are reference-counted by the GEM core. References can be
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acquired and release by calling drm_gem_object_get() and drm_gem_object_put()
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respectively.
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When the last reference to a GEM object is released the GEM core calls
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the :c:type:`struct drm_gem_object_funcs <gem_object_funcs>` free
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operation. That operation is mandatory for GEM-enabled drivers and must
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free the GEM object and all associated resources.
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void (\*free) (struct drm_gem_object \*obj); Drivers are
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responsible for freeing all GEM object resources. This includes the
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resources created by the GEM core, which need to be released with
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drm_gem_object_release().
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GEM Objects Naming
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------------------
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Communication between userspace and the kernel refers to GEM objects
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using local handles, global names or, more recently, file descriptors.
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All of those are 32-bit integer values; the usual Linux kernel limits
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apply to the file descriptors.
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GEM handles are local to a DRM file. Applications get a handle to a GEM
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object through a driver-specific ioctl, and can use that handle to refer
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to the GEM object in other standard or driver-specific ioctls. Closing a
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DRM file handle frees all its GEM handles and dereferences the
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associated GEM objects.
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To create a handle for a GEM object drivers call drm_gem_handle_create(). The
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function takes a pointer to the DRM file and the GEM object and returns a
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locally unique handle. When the handle is no longer needed drivers delete it
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with a call to drm_gem_handle_delete(). Finally the GEM object associated with a
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handle can be retrieved by a call to drm_gem_object_lookup().
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Handles don't take ownership of GEM objects, they only take a reference
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to the object that will be dropped when the handle is destroyed. To
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avoid leaking GEM objects, drivers must make sure they drop the
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reference(s) they own (such as the initial reference taken at object
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creation time) as appropriate, without any special consideration for the
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handle. For example, in the particular case of combined GEM object and
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handle creation in the implementation of the dumb_create operation,
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drivers must drop the initial reference to the GEM object before
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returning the handle.
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GEM names are similar in purpose to handles but are not local to DRM
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files. They can be passed between processes to reference a GEM object
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globally. Names can't be used directly to refer to objects in the DRM
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API, applications must convert handles to names and names to handles
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using the DRM_IOCTL_GEM_FLINK and DRM_IOCTL_GEM_OPEN ioctls
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respectively. The conversion is handled by the DRM core without any
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driver-specific support.
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GEM also supports buffer sharing with dma-buf file descriptors through
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PRIME. GEM-based drivers must use the provided helpers functions to
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implement the exporting and importing correctly. See ?. Since sharing
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file descriptors is inherently more secure than the easily guessable and
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global GEM names it is the preferred buffer sharing mechanism. Sharing
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buffers through GEM names is only supported for legacy userspace.
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Furthermore PRIME also allows cross-device buffer sharing since it is
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based on dma-bufs.
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GEM Objects Mapping
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-------------------
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Because mapping operations are fairly heavyweight GEM favours
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read/write-like access to buffers, implemented through driver-specific
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ioctls, over mapping buffers to userspace. However, when random access
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to the buffer is needed (to perform software rendering for instance),
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direct access to the object can be more efficient.
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The mmap system call can't be used directly to map GEM objects, as they
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don't have their own file handle. Two alternative methods currently
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co-exist to map GEM objects to userspace. The first method uses a
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driver-specific ioctl to perform the mapping operation, calling
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do_mmap() under the hood. This is often considered
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dubious, seems to be discouraged for new GEM-enabled drivers, and will
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thus not be described here.
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The second method uses the mmap system call on the DRM file handle. void
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\*mmap(void \*addr, size_t length, int prot, int flags, int fd, off_t
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offset); DRM identifies the GEM object to be mapped by a fake offset
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passed through the mmap offset argument. Prior to being mapped, a GEM
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object must thus be associated with a fake offset. To do so, drivers
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must call drm_gem_create_mmap_offset() on the object.
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Once allocated, the fake offset value must be passed to the application
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in a driver-specific way and can then be used as the mmap offset
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argument.
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The GEM core provides a helper method drm_gem_mmap() to
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handle object mapping. The method can be set directly as the mmap file
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operation handler. It will look up the GEM object based on the offset
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value and set the VMA operations to the :c:type:`struct drm_driver
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<drm_driver>` gem_vm_ops field. Note that drm_gem_mmap() doesn't map memory to
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userspace, but relies on the driver-provided fault handler to map pages
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individually.
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To use drm_gem_mmap(), drivers must fill the struct :c:type:`struct drm_driver
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<drm_driver>` gem_vm_ops field with a pointer to VM operations.
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The VM operations is a :c:type:`struct vm_operations_struct <vm_operations_struct>`
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made up of several fields, the more interesting ones being:
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.. code-block:: c
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struct vm_operations_struct {
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void (*open)(struct vm_area_struct * area);
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void (*close)(struct vm_area_struct * area);
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vm_fault_t (*fault)(struct vm_fault *vmf);
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};
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The open and close operations must update the GEM object reference
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count. Drivers can use the drm_gem_vm_open() and drm_gem_vm_close() helper
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functions directly as open and close handlers.
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The fault operation handler is responsible for mapping individual pages
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to userspace when a page fault occurs. Depending on the memory
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allocation scheme, drivers can allocate pages at fault time, or can
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decide to allocate memory for the GEM object at the time the object is
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created.
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Drivers that want to map the GEM object upfront instead of handling page
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faults can implement their own mmap file operation handler.
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For platforms without MMU the GEM core provides a helper method
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drm_gem_dma_get_unmapped_area(). The mmap() routines will call this to get a
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proposed address for the mapping.
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To use drm_gem_dma_get_unmapped_area(), drivers must fill the struct
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:c:type:`struct file_operations <file_operations>` get_unmapped_area field with
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a pointer on drm_gem_dma_get_unmapped_area().
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More detailed information about get_unmapped_area can be found in
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Documentation/admin-guide/mm/nommu-mmap.rst
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Memory Coherency
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----------------
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When mapped to the device or used in a command buffer, backing pages for
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an object are flushed to memory and marked write combined so as to be
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coherent with the GPU. Likewise, if the CPU accesses an object after the
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GPU has finished rendering to the object, then the object must be made
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coherent with the CPU's view of memory, usually involving GPU cache
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flushing of various kinds. This core CPU<->GPU coherency management is
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provided by a device-specific ioctl, which evaluates an object's current
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domain and performs any necessary flushing or synchronization to put the
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object into the desired coherency domain (note that the object may be
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busy, i.e. an active render target; in that case, setting the domain
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blocks the client and waits for rendering to complete before performing
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any necessary flushing operations).
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Command Execution
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-----------------
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Perhaps the most important GEM function for GPU devices is providing a
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command execution interface to clients. Client programs construct
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command buffers containing references to previously allocated memory
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objects, and then submit them to GEM. At that point, GEM takes care to
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bind all the objects into the GTT, execute the buffer, and provide
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necessary synchronization between clients accessing the same buffers.
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This often involves evicting some objects from the GTT and re-binding
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others (a fairly expensive operation), and providing relocation support
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which hides fixed GTT offsets from clients. Clients must take care not
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to submit command buffers that reference more objects than can fit in
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the GTT; otherwise, GEM will reject them and no rendering will occur.
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Similarly, if several objects in the buffer require fence registers to
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be allocated for correct rendering (e.g. 2D blits on pre-965 chips),
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care must be taken not to require more fence registers than are
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available to the client. Such resource management should be abstracted
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from the client in libdrm.
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GEM Function Reference
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----------------------
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.. kernel-doc:: include/drm/drm_gem.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_gem.c
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:export:
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GEM DMA Helper Functions Reference
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----------------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_gem_dma_helper.c
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:doc: dma helpers
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.. kernel-doc:: include/drm/drm_gem_dma_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_gem_dma_helper.c
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:export:
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GEM SHMEM Helper Function Reference
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-----------------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_gem_shmem_helper.c
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:doc: overview
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.. kernel-doc:: include/drm/drm_gem_shmem_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_gem_shmem_helper.c
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:export:
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GEM VRAM Helper Functions Reference
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-----------------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_gem_vram_helper.c
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:doc: overview
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.. kernel-doc:: include/drm/drm_gem_vram_helper.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_gem_vram_helper.c
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:export:
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GEM TTM Helper Functions Reference
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-----------------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_gem_ttm_helper.c
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:doc: overview
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.. kernel-doc:: drivers/gpu/drm/drm_gem_ttm_helper.c
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:export:
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VMA Offset Manager
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==================
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.. kernel-doc:: drivers/gpu/drm/drm_vma_manager.c
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:doc: vma offset manager
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.. kernel-doc:: include/drm/drm_vma_manager.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_vma_manager.c
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:export:
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.. _prime_buffer_sharing:
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PRIME Buffer Sharing
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====================
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PRIME is the cross device buffer sharing framework in drm, originally
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created for the OPTIMUS range of multi-gpu platforms. To userspace PRIME
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buffers are dma-buf based file descriptors.
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Overview and Lifetime Rules
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---------------------------
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.. kernel-doc:: drivers/gpu/drm/drm_prime.c
|
|
:doc: overview and lifetime rules
|
|
|
|
PRIME Helper Functions
|
|
----------------------
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/drm_prime.c
|
|
:doc: PRIME Helpers
|
|
|
|
PRIME Function References
|
|
-------------------------
|
|
|
|
.. kernel-doc:: include/drm/drm_prime.h
|
|
:internal:
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/drm_prime.c
|
|
: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 roster
|
|
|
|
DRM MM Range Allocator Function References
|
|
------------------------------------------
|
|
|
|
.. kernel-doc:: include/drm/drm_mm.h
|
|
:internal:
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/drm_mm.c
|
|
:export:
|
|
|
|
DRM Buddy Allocator
|
|
===================
|
|
|
|
DRM Buddy Function References
|
|
-----------------------------
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/drm_buddy.c
|
|
:export:
|
|
|
|
DRM Cache Handling and Fast WC memcpy()
|
|
=======================================
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/drm_cache.c
|
|
:export:
|
|
|
|
DRM Sync Objects
|
|
===========================
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/drm_syncobj.c
|
|
:doc: Overview
|
|
|
|
.. kernel-doc:: include/drm/drm_syncobj.h
|
|
:internal:
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/drm_syncobj.c
|
|
:export:
|
|
|
|
GPU Scheduler
|
|
=============
|
|
|
|
Overview
|
|
--------
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/scheduler/sched_main.c
|
|
:doc: Overview
|
|
|
|
Scheduler Function References
|
|
-----------------------------
|
|
|
|
.. kernel-doc:: include/drm/gpu_scheduler.h
|
|
:internal:
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/scheduler/sched_main.c
|
|
:export:
|
|
|
|
.. kernel-doc:: drivers/gpu/drm/scheduler/sched_entity.c
|
|
:export:
|