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dma mapping changes for Linux 4.16:

Browse source 
This pull requests contains a consolidation of the generic no-IOMMU code,
 a well as the glue code for swiotlb.  All the code is based on the x86
 implementation with hooks to allow all architectures that aren't cache
 coherent to use it.  The x86 conversion itself has been deferred because
 the x86 maintainers were a little busy in the last months.
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Merge tag 'dma-mapping-4.16' of git://git.infradead.org/users/hch/dma-mapping

Pull dma mapping updates from Christoph Hellwig:
 "Except for a runtime warning fix from Christian this is all about
  consolidation of the generic no-IOMMU code, a well as the glue code
  for swiotlb.

  All the code is based on the x86 implementation with hooks to allow
  all architectures that aren't cache coherent to use it.

  The x86 conversion itself has been deferred because the x86
  maintainers were a little busy in the last months"

* tag 'dma-mapping-4.16' of git://git.infradead.org/users/hch/dma-mapping: (57 commits)
  MAINTAINERS: add the iommu list for swiotlb and xen-swiotlb
  arm64: use swiotlb_alloc and swiotlb_free
  arm64: replace ZONE_DMA with ZONE_DMA32
  mips: use swiotlb_{alloc,free}
  mips/netlogic: remove swiotlb support
  tile: use generic swiotlb_ops
  tile: replace ZONE_DMA with ZONE_DMA32
  unicore32: use generic swiotlb_ops
  ia64: remove an ifdef around the content of pci-dma.c
  ia64: clean up swiotlb support
  ia64: use generic swiotlb_ops
  ia64: replace ZONE_DMA with ZONE_DMA32
  swiotlb: remove various exports
  swiotlb: refactor coherent buffer allocation
  swiotlb: refactor coherent buffer freeing
  swiotlb: wire up ->dma_supported in swiotlb_dma_ops
  swiotlb: add common swiotlb_map_ops
  swiotlb: rename swiotlb_free to swiotlb_exit
  x86: rename swiotlb_dma_ops
  powerpc: rename swiotlb_dma_ops
  ...
This commit is contained in:
Linus Torvalds 2018-01-31 11:32:27 -08:00
commit 2382dc9a3e
119 changed files with 728 additions and 1266 deletions
Download patch file Download diff file Expand all files Collapse all files

4
arch/microblaze/include/asm/dma-mapping.h
View file

@ -18,11 +18,11 @@
/*
* Available generic sets of operations
*/
extern const struct dma_map_ops dma_direct_ops;
extern const struct dma_map_ops dma_nommu_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
return &dma_direct_ops;
return &dma_nommu_ops;
}
#endif /* _ASM_MICROBLAZE_DMA_MAPPING_H */

78
arch/microblaze/kernel/dma.c
View file

@ -15,42 +15,18 @@
#include <linux/bug.h>
#include <asm/cacheflush.h>
#define NOT_COHERENT_CACHE
static void *dma_direct_alloc_coherent(struct device *dev, size_t size,
static void *dma_nommu_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,
unsigned long attrs)
{
#ifdef NOT_COHERENT_CACHE
return consistent_alloc(flag, size, dma_handle);
#else
void *ret;
struct page *page;
int node = dev_to_node(dev);
/* ignore region specifiers */
flag &= ~(__GFP_HIGHMEM);
page = alloc_pages_node(node, flag, get_order(size));
if (page == NULL)
return NULL;
ret = page_address(page);
memset(ret, 0, size);
*dma_handle = virt_to_phys(ret);
return ret;
#endif
}
static void dma_direct_free_coherent(struct device *dev, size_t size,
static void dma_nommu_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs)
{
#ifdef NOT_COHERENT_CACHE
consistent_free(size, vaddr);
#else
free_pages((unsigned long)vaddr, get_order(size));
#endif
}
static inline void __dma_sync(unsigned long paddr,
@ -69,7 +45,7 @@ static inline void __dma_sync(unsigned long paddr,
}
}
static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
static int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction direction,
unsigned long attrs)
{
@ -89,12 +65,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
return nents;
}
static int dma_direct_dma_supported(struct device *dev, u64 mask)
{
return 1;
}
static inline dma_addr_t dma_direct_map_page(struct device *dev,
static inline dma_addr_t dma_nommu_map_page(struct device *dev,
struct page *page,
unsigned long offset,
size_t size,
@ -106,7 +77,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
return page_to_phys(page) + offset;
}
static inline void dma_direct_unmap_page(struct device *dev,
static inline void dma_nommu_unmap_page(struct device *dev,
dma_addr_t dma_address,
size_t size,
enum dma_data_direction direction,
@ -122,7 +93,7 @@ static inline void dma_direct_unmap_page(struct device *dev,
}
static inline void
dma_direct_sync_single_for_cpu(struct device *dev,
dma_nommu_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction direction)
{
@ -136,7 +107,7 @@ dma_direct_sync_single_for_cpu(struct device *dev,
}
static inline void
dma_direct_sync_single_for_device(struct device *dev,
dma_nommu_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction direction)
{
@ -150,7 +121,7 @@ dma_direct_sync_single_for_device(struct device *dev,
}
static inline void
dma_direct_sync_sg_for_cpu(struct device *dev,
dma_nommu_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sgl, int nents,
enum dma_data_direction direction)
{
@ -164,7 +135,7 @@ dma_direct_sync_sg_for_cpu(struct device *dev,
}
static inline void
dma_direct_sync_sg_for_device(struct device *dev,
dma_nommu_sync_sg_for_device(struct device *dev,
struct scatterlist *sgl, int nents,
enum dma_data_direction direction)
{
@ -178,7 +149,7 @@ dma_direct_sync_sg_for_device(struct device *dev,
}
static
int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
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)
{
@ -191,12 +162,8 @@ int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
if (off >= count || user_count > (count - off))
return -ENXIO;
#ifdef NOT_COHERENT_CACHE
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
pfn = consistent_virt_to_pfn(cpu_addr);
#else
pfn = virt_to_pfn(cpu_addr);
#endif
return remap_pfn_range(vma, vma->vm_start, pfn + off,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
#else
@ -204,20 +171,19 @@ int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
#endif
}
const struct dma_map_ops dma_direct_ops = {
.alloc = dma_direct_alloc_coherent,
.free = dma_direct_free_coherent,
.mmap = dma_direct_mmap_coherent,
.map_sg = dma_direct_map_sg,
.dma_supported = dma_direct_dma_supported,
.map_page = dma_direct_map_page,
.unmap_page = dma_direct_unmap_page,
.sync_single_for_cpu = dma_direct_sync_single_for_cpu,
.sync_single_for_device = dma_direct_sync_single_for_device,
.sync_sg_for_cpu = dma_direct_sync_sg_for_cpu,
.sync_sg_for_device = dma_direct_sync_sg_for_device,
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_direct_ops);
EXPORT_SYMBOL(dma_nommu_ops);
/* Number of entries preallocated for DMA-API debugging */
#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)