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openrisc: fix cache maintainance the the sync_single_for_device DMA operation 

The cache maintaince in the sync_single_for_device operation should be
equivalent to the map_page operation to facilitate reusing buffers.  Fix the
openrisc implementation by moving the cache maintaince performed in map_page
into the sync_single method, and calling that from map_page.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Christoph Hellwig 2018-07-19 06:02:31 -07:00 committed by Stafford Horne
parent dcc9c91944
commit 2c1de929ae
1 changed files with 19 additions and 23 deletions
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42
arch/openrisc/kernel/dma.c
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@ -133,19 +133,15 @@ or1k_dma_free(struct device *dev, size_t size, void *vaddr,
free_pages_exact(vaddr, size);
}
static dma_addr_t
or1k_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
unsigned long attrs)
static void
or1k_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
{
unsigned long cl;
dma_addr_t addr = page_to_phys(page) + offset;
dma_addr_t addr = dma_handle;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
return addr;
switch (dir) {
case DMA_TO_DEVICE:
/* Flush the dcache for the requested range */
@ -168,6 +164,20 @@ or1k_map_page(struct device *dev, struct page *page,
break;
}
}
static dma_addr_t
or1k_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
unsigned long attrs)
{
unsigned long cl;
dma_addr_t addr = page_to_phys(page) + offset;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
or1k_sync_single_for_device(dev, addr, size, dir);
return addr;
}
@ -187,20 +197,6 @@ or1k_map_sg(struct device *dev, struct scatterlist *sg,
return nents;
}
static void
or1k_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
{
unsigned long cl;
dma_addr_t addr = dma_handle;
struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()];
/* Flush the dcache for the requested range */
for (cl = addr; cl < addr + size; cl += cpuinfo->dcache_block_size)
mtspr(SPR_DCBFR, cl);
}
const struct dma_map_ops or1k_dma_map_ops = {
.alloc = or1k_dma_alloc,
.free = or1k_dma_free,