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dma-mapping updates for Linux 5.3

Browse source 
- move the USB special case that bounced DMA through a device
    bar into the USB code instead of handling it in the common
    DMA code (Laurentiu Tudor and Fredrik Noring)
  - don't dip into the global CMA pool for single page allocations
    (Nicolin Chen)
  - fix a crash when allocating memory for the atomic pool failed
    during boot (Florian Fainelli)
  - move support for MIPS-style uncached segments to the common
    code and use that for MIPS and nios2 (me)
  - make support for DMA_ATTR_NON_CONSISTENT and
    DMA_ATTR_NO_KERNEL_MAPPING generic (me)
  - convert nds32 to the generic remapping allocator (me)
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Merge tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping updates from Christoph Hellwig:

 - move the USB special case that bounced DMA through a device bar into
   the USB code instead of handling it in the common DMA code (Laurentiu
   Tudor and Fredrik Noring)

 - don't dip into the global CMA pool for single page allocations
   (Nicolin Chen)

 - fix a crash when allocating memory for the atomic pool failed during
   boot (Florian Fainelli)

 - move support for MIPS-style uncached segments to the common code and
   use that for MIPS and nios2 (me)

 - make support for DMA_ATTR_NON_CONSISTENT and
   DMA_ATTR_NO_KERNEL_MAPPING generic (me)

 - convert nds32 to the generic remapping allocator (me)

* tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping: (29 commits)
  dma-mapping: mark dma_alloc_need_uncached as __always_inline
  MIPS: only select ARCH_HAS_UNCACHED_SEGMENT for non-coherent platforms
  usb: host: Fix excessive alignment restriction for local memory allocations
  lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators
  nios2: use the generic uncached segment support in dma-direct
  nds32: use the generic remapping allocator for coherent DMA allocations
  arc: use the generic remapping allocator for coherent DMA allocations
  dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code
  dma-direct: handle DMA_ATTR_NON_CONSISTENT in common code
  dma-mapping: add a dma_alloc_need_uncached helper
  openrisc: remove the partial DMA_ATTR_NON_CONSISTENT support
  arc: remove the partial DMA_ATTR_NON_CONSISTENT support
  arm-nommu: remove the partial DMA_ATTR_NON_CONSISTENT support
  ARM: dma-mapping: allow larger DMA mask than supported
  dma-mapping: truncate dma masks to what dma_addr_t can hold
  iommu/dma: Apply dma_{alloc,free}_contiguous functions
  dma-remap: Avoid de-referencing NULL atomic_pool
  MIPS: use the generic uncached segment support in dma-direct
  dma-direct: provide generic support for uncached kernel segments
  au1100fb: fix DMA API abuse
  ...
This commit is contained in:
Linus Torvalds 2019-07-12 15:13:55 -07:00
commit 9e3a25dc99
41 changed files with 515 additions and 654 deletions
Download patch file Download diff file Expand all files Collapse all files

1
arch/nios2/Kconfig
View file

@ -4,6 +4,7 @@ config NIOS2
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_HAS_UNCACHED_SEGMENT
select ARCH_NO_SWAP
select TIMER_OF
select GENERIC_ATOMIC64

6
arch/nios2/include/asm/page.h
View file

@ -101,12 +101,6 @@ static inline bool pfn_valid(unsigned long pfn)
# define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
# define UNCAC_ADDR(addr) \
((void *)((unsigned)(addr) | CONFIG_NIOS2_IO_REGION_BASE))
# define CAC_ADDR(addr) \
((void *)(((unsigned)(addr) & ~CONFIG_NIOS2_IO_REGION_BASE) | \
CONFIG_NIOS2_KERNEL_REGION_BASE))
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

40
arch/nios2/mm/dma-mapping.c
View file

@ -60,32 +60,28 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
}
}
void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
void arch_dma_prep_coherent(struct page *page, size_t size)
{
void *ret;
unsigned long start = (unsigned long)page_address(page);
/* optimized page clearing */
gfp |= __GFP_ZERO;
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
gfp |= GFP_DMA;
ret = (void *) __get_free_pages(gfp, get_order(size));
if (ret != NULL) {
*dma_handle = virt_to_phys(ret);
flush_dcache_range((unsigned long) ret,
(unsigned long) ret + size);
ret = UNCAC_ADDR(ret);
}
return ret;
flush_dcache_range(start, start + size);
}
void arch_dma_free(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
void *uncached_kernel_address(void *ptr)
{
unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
unsigned long addr = (unsigned long)ptr;
free_pages(addr, get_order(size));
addr |= CONFIG_NIOS2_IO_REGION_BASE;
return (void *)ptr;
}
void *cached_kernel_address(void *ptr)
{
unsigned long addr = (unsigned long)ptr;
addr &= ~CONFIG_NIOS2_IO_REGION_BASE;
addr |= CONFIG_NIOS2_KERNEL_REGION_BASE;
return (void *)ptr;
}