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| author | Lucas De Marchi <lucas.demarchi@intel.com> | 2022-02-04 20:05:41 +0300 |
|---|---|---|
| committer | Lucas De Marchi <lucas.demarchi@intel.com> | 2022-02-08 03:35:35 +0300 |
| commit | 7938f4218168ae9fc4bdddb15976f9ebbae41999 (patch) | |
| tree | 41a2fbe9a1091940d6043e02ad9a2f9b3680bdb0 /Documentation/driver-api/device-io.rst | |
| parent | 722b717d8e2759d943dc1f55a2f6fe19c55080aa (diff) | |
| download | linux-7938f4218168ae9fc4bdddb15976f9ebbae41999.tar.xz | |
dma-buf-map: Rename to iosys-map
Rename struct dma_buf_map to struct iosys_map and corresponding APIs.
Over time dma-buf-map grew up to more functionality than the one used by
dma-buf: in fact it's just a shim layer to abstract system memory, that
can be accessed via regular load and store, from IO memory that needs to
be acessed via arch helpers.
The idea is to extend this API so it can fulfill other needs, internal
to a single driver. Example: in the i915 driver it's desired to share
the implementation for integrated graphics, which uses mostly system
memory, with discrete graphics, which may need to access IO memory.
The conversion was mostly done with the following semantic patch:
@r1@
@@
- struct dma_buf_map
+ struct iosys_map
@r2@
@@
(
- DMA_BUF_MAP_INIT_VADDR
+ IOSYS_MAP_INIT_VADDR
|
- dma_buf_map_set_vaddr
+ iosys_map_set_vaddr
|
- dma_buf_map_set_vaddr_iomem
+ iosys_map_set_vaddr_iomem
|
- dma_buf_map_is_equal
+ iosys_map_is_equal
|
- dma_buf_map_is_null
+ iosys_map_is_null
|
- dma_buf_map_is_set
+ iosys_map_is_set
|
- dma_buf_map_clear
+ iosys_map_clear
|
- dma_buf_map_memcpy_to
+ iosys_map_memcpy_to
|
- dma_buf_map_incr
+ iosys_map_incr
)
@@
@@
- #include <linux/dma-buf-map.h>
+ #include <linux/iosys-map.h>
Then some files had their includes adjusted and some comments were
update to remove mentions to dma-buf-map.
Since this is not specific to dma-buf anymore, move the documentation to
the "Bus-Independent Device Accesses" section.
v2:
- Squash patches
v3:
- Fix wrong removal of dma-buf.h from MAINTAINERS
- Move documentation from dma-buf.rst to device-io.rst
v4:
- Change documentation title and level
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220204170541.829227-1-lucas.demarchi@intel.com
Diffstat (limited to 'Documentation/driver-api/device-io.rst')
| -rw-r--r-- | Documentation/driver-api/device-io.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/driver-api/device-io.rst b/Documentation/driver-api/device-io.rst index e9f04b1815d1..4d2baac0311c 100644 --- a/Documentation/driver-api/device-io.rst +++ b/Documentation/driver-api/device-io.rst @@ -502,6 +502,15 @@ pcim_iomap() Not using these wrappers may make drivers unusable on certain platforms with stricter rules for mapping I/O memory. +Generalizing Access to System and I/O Memory +============================================ + +.. kernel-doc:: include/linux/iosys-map.h + :doc: overview + +.. kernel-doc:: include/linux/iosys-map.h + :internal: + Public Functions Provided ========================= |