Commit graph

13 commits

Author SHA1 Message Date
Christoph Hellwig
0a0f0d8be7 dma-mapping: split <linux/dma-mapping.h>
Split out all the bits that are purely for dma_map_ops implementations
and related code into a new <linux/dma-map-ops.h> header so that they
don't get pulled into all the drivers.  That also means the architecture
specific <asm/dma-mapping.h> is not pulled in by <linux/dma-mapping.h>
any more, which leads to a missing includes that were pulled in by the
x86 or arm versions in a few not overly portable drivers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-10-06 07:07:03 +02:00
Jim Quinlan
e0d072782c dma-mapping: introduce DMA range map, supplanting dma_pfn_offset
The new field 'dma_range_map' in struct device is used to facilitate the
use of single or multiple offsets between mapping regions of cpu addrs and
dma addrs.  It subsumes the role of "dev->dma_pfn_offset" which was only
capable of holding a single uniform offset and had no region bounds
checking.

The function of_dma_get_range() has been modified so that it takes a single
argument -- the device node -- and returns a map, NULL, or an error code.
The map is an array that holds the information regarding the DMA regions.
Each range entry contains the address offset, the cpu_start address, the
dma_start address, and the size of the region.

of_dma_configure() is the typical manner to set range offsets but there are
a number of ad hoc assignments to "dev->dma_pfn_offset" in the kernel
driver code.  These cases now invoke the function
dma_direct_set_offset(dev, cpu_addr, dma_addr, size).

Signed-off-by: Jim Quinlan <james.quinlan@broadcom.com>
[hch: various interface cleanups]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
2020-09-17 18:43:56 +02:00
Christoph Hellwig
a92df4f62f dma-mapping: move the dma_declare_coherent_memory documentation
dma_declare_coherent_memory should not be in a DMA API guide aimed
at driver writers (that is consumers of the API).  Move it to a comment
near the function instead.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
2020-09-11 09:17:42 +02:00
Kevin Grandemange
286c21de32 dma-coherent: fix integer overflow in the reserved-memory dma allocation
pageno is an int and the PAGE_SHIFT shift is done on an int,
overflowing if the memory is bigger than 2G

This can be reproduced using for example a reserved-memory of 4G

reserved-memory {
		    #address-cells = <2>;
		    #size-cells = <2>;
		    ranges;

		    reserved_dma: buffer@0 {
		        compatible = "shared-dma-pool";
		        no-map;
		        reg = <0x5 0x00000000 0x1 0x0>;
        };
};

Signed-off-by: Kevin Grandemange <kevin.grandemange@allegrodvt.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-03-16 10:43:02 +01:00
Vladimir Murzin
a445e940ea dma-mapping: fix handling of dma-ranges for reserved memory (again)
Daniele reported that issue previously fixed in c41f9ea998
("drivers: dma-coherent: Account dma_pfn_offset when used with device
tree") reappear shortly after 43fc509c3e ("dma-coherent: introduce
interface for default DMA pool") where fix was accidentally dropped.

Lets put fix back in place and respect dma-ranges for reserved memory.

Fixes: 43fc509c3e ("dma-coherent: introduce interface for default DMA pool")

Reported-by: Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
Tested-by: Daniele Alessandrelli <daniele.alessandrelli@gmail.com>
Tested-by: Alexandre Torgue <alexandre.torgue@st.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-10-30 11:07:35 -07:00
Christoph Hellwig
d9295532d5 dma-mapping: remove the dma_declare_coherent_memory export
dma_declare_coherent_memory is something that the platform setup code
(which pretty much means the device tree these days) need to do so that
drivers can use the memory as declared by the platform.  Drivers
themselves have no business calling this function.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-04 11:13:19 +02:00
Christoph Hellwig
7a01ee4220 dma-mapping: remove the dma_mmap_from_dev_coherent export
dma_mmap_from_dev_coherent is only used by dma_map_ops instances,
none of which is modular.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-04 11:13:19 +02:00
Christoph Hellwig
1fa0682448 dma-mapping: remove dma_release_declared_memory
This function is entirely unused given that declared memory is
generally provided by platform setup code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-09-04 11:13:19 +02:00
Christoph Hellwig
82c5de0ab8 dma-mapping: remove the DMA_MEMORY_EXCLUSIVE flag
All users of dma_declare_coherent want their allocations to be
exclusive, so default to exclusive allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-20 07:27:00 -07:00
Christoph Hellwig
91a6fda95c dma-mapping: remove dma_mark_declared_memory_occupied
This API is not used anywhere, so remove it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-02-20 07:27:00 -07:00
Christoph Hellwig
be4311a262 dma-mapping: remove an incorrect __iommem annotation
memmap return a regular void pointer, not and __iomem one.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-02-13 19:19:50 +01:00
Christoph Hellwig
48e638fb68 dma-mapping: remove a few unused exports
Now that the slow path DMA API calls are implemented out of line a few
helpers only used by them don't need to be exported anymore.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2019-01-04 09:03:17 +01:00
Christoph Hellwig
cf65a0f6f6 dma-mapping: move all DMA mapping code to kernel/dma
Currently the code is split over various files with dma- prefixes in the
lib/ and drives/base directories, and the number of files keeps growing.
Move them into a single directory to keep the code together and remove
the file name prefixes.  To match the irq infrastructure this directory
is placed under the kernel/ directory.

Signed-off-by: Christoph Hellwig <hch@lst.de>
2018-06-14 08:50:37 +02:00
Renamed from drivers/base/dma-coherent.c (Browse further)