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authorChristoph Hellwig <hch@lst.de>2018-07-19 05:54:39 -0700
committerMichal Simek <michal.simek@xilinx.com>2018-07-20 14:29:47 +0200
commit5411ad27dba1e59923f3865f90ab756fd6b9ab3c (patch)
treefba184190c76cefbaf233b08dbce9cb88adc8353 /arch/microblaze/kernel/dma.c
parentbd05a58ddfd719015d66e8670af48feb386a3ca6 (diff)
microblaze: use generic dma_noncoherent_ops
Switch to the generic noncoherent direct mapping implementation. This removes the direction-based optimizations in sync_{single,sg}_for_{cpu,device} which were marked untestested and do not match the usually very well tested {un,}map_{single,sg} implementations. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/microblaze/kernel/dma.c')
-rw-r--r--arch/microblaze/kernel/dma.c144
1 files changed, 12 insertions, 132 deletions
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index 3145e7dc8ab1..71032cf64669 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -8,29 +8,15 @@
*/
#include <linux/device.h>
-#include <linux/dma-mapping.h>
+#include <linux/dma-noncoherent.h>
#include <linux/gfp.h>
#include <linux/dma-debug.h>
#include <linux/export.h>
#include <linux/bug.h>
#include <asm/cacheflush.h>
-static void *dma_nommu_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t flag,
- unsigned long attrs)
-{
- return consistent_alloc(flag, size, dma_handle);
-}
-
-static void dma_nommu_free_coherent(struct device *dev, size_t size,
- void *vaddr, dma_addr_t dma_handle,
- unsigned long attrs)
-{
- consistent_free(size, vaddr);
-}
-
-static inline void __dma_sync(unsigned long paddr,
- size_t size, enum dma_data_direction direction)
+static void __dma_sync(struct device *dev, phys_addr_t paddr, size_t size,
+ enum dma_data_direction direction)
{
switch (direction) {
case DMA_TO_DEVICE:
@@ -45,113 +31,21 @@ static inline void __dma_sync(unsigned long paddr,
}
}
-static int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction direction,
- unsigned long attrs)
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
{
- struct scatterlist *sg;
- int i;
-
- /* FIXME this part of code is untested */
- for_each_sg(sgl, sg, nents, i) {
- sg->dma_address = sg_phys(sg);
-
- if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
- continue;
-
- __dma_sync(sg_phys(sg), sg->length, direction);
- }
-
- return nents;
-}
-
-static inline dma_addr_t dma_nommu_map_page(struct device *dev,
- struct page *page,
- unsigned long offset,
- size_t size,
- enum dma_data_direction direction,
- unsigned long attrs)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_sync(page_to_phys(page) + offset, size, direction);
- return page_to_phys(page) + offset;
+ __dma_sync(dev, paddr, size, dir);
}
-static inline void dma_nommu_unmap_page(struct device *dev,
- dma_addr_t dma_address,
- size_t size,
- enum dma_data_direction direction,
- unsigned long attrs)
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir)
{
-/* There is not necessary to do cache cleanup
- *
- * phys_to_virt is here because in __dma_sync_page is __virt_to_phys and
- * dma_address is physical address
- */
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_sync(dma_address, size, direction);
+ __dma_sync(dev, paddr, size, dir);
}
-static inline void
-dma_nommu_sync_single_for_cpu(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction direction)
-{
- /*
- * It's pointless to flush the cache as the memory segment
- * is given to the CPU
- */
-
- if (direction == DMA_FROM_DEVICE)
- __dma_sync(dma_handle, size, direction);
-}
-
-static inline void
-dma_nommu_sync_single_for_device(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- enum dma_data_direction direction)
-{
- /*
- * It's pointless to invalidate the cache if the device isn't
- * supposed to write to the relevant region
- */
-
- if (direction == DMA_TO_DEVICE)
- __dma_sync(dma_handle, size, direction);
-}
-
-static inline void
-dma_nommu_sync_sg_for_cpu(struct device *dev,
- struct scatterlist *sgl, int nents,
- enum dma_data_direction direction)
-{
- struct scatterlist *sg;
- int i;
-
- /* FIXME this part of code is untested */
- if (direction == DMA_FROM_DEVICE)
- for_each_sg(sgl, sg, nents, i)
- __dma_sync(sg->dma_address, sg->length, direction);
-}
-
-static inline void
-dma_nommu_sync_sg_for_device(struct device *dev,
- struct scatterlist *sgl, int nents,
- enum dma_data_direction direction)
-{
- struct scatterlist *sg;
- int i;
-
- /* FIXME this part of code is untested */
- if (direction == DMA_TO_DEVICE)
- for_each_sg(sgl, sg, nents, i)
- __dma_sync(sg->dma_address, sg->length, direction);
-}
-
-static
-int dma_nommu_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
- void *cpu_addr, dma_addr_t handle, size_t size,
- unsigned long attrs)
+int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t handle, size_t size,
+ unsigned long attrs)
{
#ifdef CONFIG_MMU
unsigned long user_count = vma_pages(vma);
@@ -170,17 +64,3 @@ int dma_nommu_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
return -ENXIO;
#endif
}
-
-const struct dma_map_ops dma_nommu_ops = {
- .alloc = dma_nommu_alloc_coherent,
- .free = dma_nommu_free_coherent,
- .mmap = dma_nommu_mmap_coherent,
- .map_sg = dma_nommu_map_sg,
- .map_page = dma_nommu_map_page,
- .unmap_page = dma_nommu_unmap_page,
- .sync_single_for_cpu = dma_nommu_sync_single_for_cpu,
- .sync_single_for_device = dma_nommu_sync_single_for_device,
- .sync_sg_for_cpu = dma_nommu_sync_sg_for_cpu,
- .sync_sg_for_device = dma_nommu_sync_sg_for_device,
-};
-EXPORT_SYMBOL(dma_nommu_ops);