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dma-mapping: don't store redundant offsets 

A bus_dma_region necessarily stores both CPU and DMA base addresses for
a range, so there's no need to also store the difference between them.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Robin Murphy 2023-11-24 18:10:03 +00:00 committed by Christoph Hellwig
parent 3f7168591e
commit 4ad4c1f394
4 changed files with 12 additions and 10 deletions
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1
drivers/acpi/scan.c
View File

@ -1532,7 +1532,6 @@ int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map)
r->cpu_start = rentry->res->start;
r->dma_start = rentry->res->start - rentry->offset;
r->size = resource_size(rentry->res);
r->offset = rentry->offset;
r++;
}
}

1
drivers/of/address.c
View File

@ -955,7 +955,6 @@ int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
r->cpu_start = range.cpu_addr;
r->dma_start = range.bus_addr;
r->size = range.size;
r->offset = range.cpu_addr - range.bus_addr;
r++;
}
out:

19
include/linux/dma-direct.h
View File

@ -21,7 +21,6 @@ struct bus_dma_region {
phys_addr_t cpu_start;
dma_addr_t dma_start;
u64 size;
u64 offset;
};
static inline dma_addr_t translate_phys_to_dma(struct device *dev,
@ -29,9 +28,12 @@ static inline dma_addr_t translate_phys_to_dma(struct device *dev,
{
const struct bus_dma_region *m;
for (m = dev->dma_range_map; m->size; m++)
if (paddr >= m->cpu_start && paddr - m->cpu_start < m->size)
return (dma_addr_t)paddr - m->offset;
for (m = dev->dma_range_map; m->size; m++) {
u64 offset = paddr - m->cpu_start;
if (paddr >= m->cpu_start && offset < m->size)
return m->dma_start + offset;
}
/* make sure dma_capable fails when no translation is available */
return DMA_MAPPING_ERROR;
@ -42,9 +44,12 @@ static inline phys_addr_t translate_dma_to_phys(struct device *dev,
{
const struct bus_dma_region *m;
for (m = dev->dma_range_map; m->size; m++)
if (dma_addr >= m->dma_start && dma_addr - m->dma_start < m->size)
return (phys_addr_t)dma_addr + m->offset;
for (m = dev->dma_range_map; m->size; m++) {
u64 offset = dma_addr - m->dma_start;
if (dma_addr >= m->dma_start && offset < m->size)
return m->cpu_start + offset;
}
return (phys_addr_t)-1;
}

1
kernel/dma/direct.c
View File

@ -677,7 +677,6 @@ int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
return -ENOMEM;
map[0].cpu_start = cpu_start;
map[0].dma_start = dma_start;
map[0].offset = offset;
map[0].size = size;
dev->dma_range_map = map;
return 0;