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| author | Jim Quinlan <james.quinlan@broadcom.com> | 2020-09-17 18:43:40 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-09-17 18:43:56 +0200 |
| commit | e0d072782c734d27f5af062c62266f2598f68542 (patch) | |
| tree | f259e9eaab55ae8ffedaea07a19e8f147dcceb9a /kernel/dma/coherent.c | |
| parent | 6eb0233ec2d0df288fe8515d5b0b2b15562e05bb (diff) | |
| download | linux-e0d072782c734d27f5af062c62266f2598f68542.tar.bz2 | |
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>
Diffstat (limited to 'kernel/dma/coherent.c')
| -rw-r--r-- | kernel/dma/coherent.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index f85d14bbfcbe..c0685196fb6d 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -7,7 +7,7 @@ #include <linux/slab.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/dma-mapping.h> +#include <linux/dma-direct.h> struct dma_coherent_mem { void *virt_base; @@ -32,9 +32,8 @@ static inline dma_addr_t dma_get_device_base(struct device *dev, struct dma_coherent_mem * mem) { if (mem->use_dev_dma_pfn_offset) - return (mem->pfn_base - dev->dma_pfn_offset) << PAGE_SHIFT; - else - return mem->device_base; + return phys_to_dma(dev, PFN_PHYS(mem->pfn_base)); + return mem->device_base; } static int dma_init_coherent_memory(phys_addr_t phys_addr, |