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Merge tag 'dma-mapping-5.7' of git://git.infradead.org/users/hch/dma-mapping

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Pull dma-mapping updates from Christoph Hellwig:

 - fix an integer overflow in the coherent pool (Kevin Grandemange)

 - provide support for in-place uncached remapping and use that for
   openrisc

 - fix the arm coherent allocator to take the bus limit into account

* tag 'dma-mapping-5.7' of git://git.infradead.org/users/hch/dma-mapping:
  ARM/dma-mapping: merge __dma_supported into arm_dma_supported
  ARM/dma-mapping: take the bus limit into account in __dma_alloc
  ARM/dma-mapping: remove get_coherent_dma_mask
  openrisc: use the generic in-place uncached DMA allocator
  dma-direct: provide a arch_dma_clear_uncached hook
  dma-direct: make uncached_kernel_address more general
  dma-direct: consolidate the error handling in dma_direct_alloc_pages
  dma-direct: remove the cached_kernel_address hook
  dma-coherent: fix integer overflow in the reserved-memory dma allocation
This commit is contained in:
Linus Torvalds
2020-04-04 10:12:47 -07:00
parent 1e396a5d17 fd27a526bb
commit 6f43bae382
16 changed files with 76 additions and 166 deletions
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13
kernel/dma/coherent.c
View File

@@ -134,7 +134,7 @@ static void *__dma_alloc_from_coherent(struct device *dev,
spin_lock_irqsave(&mem->spinlock, flags);
if (unlikely(size > (mem->size << PAGE_SHIFT)))
if (unlikely(size > ((dma_addr_t)mem->size << PAGE_SHIFT)))
goto err;
pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
@@ -144,8 +144,9 @@ static void *__dma_alloc_from_coherent(struct device *dev,
/*
* Memory was found in the coherent area.
*/
*dma_handle = dma_get_device_base(dev, mem) + (pageno << PAGE_SHIFT);
ret = mem->virt_base + (pageno << PAGE_SHIFT);
*dma_handle = dma_get_device_base(dev, mem) +
((dma_addr_t)pageno << PAGE_SHIFT);
ret = mem->virt_base + ((dma_addr_t)pageno << PAGE_SHIFT);
spin_unlock_irqrestore(&mem->spinlock, flags);
memset(ret, 0, size);
return ret;
@@ -194,7 +195,7 @@ static int __dma_release_from_coherent(struct dma_coherent_mem *mem,
int order, void *vaddr)
{
if (mem && vaddr >= mem->virt_base && vaddr <
(mem->virt_base + (mem->size << PAGE_SHIFT))) {
(mem->virt_base + ((dma_addr_t)mem->size << PAGE_SHIFT))) {
int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
unsigned long flags;
@@ -238,10 +239,10 @@ static int __dma_mmap_from_coherent(struct dma_coherent_mem *mem,
struct vm_area_struct *vma, void *vaddr, size_t size, int *ret)
{
if (mem && vaddr >= mem->virt_base && vaddr + size <=
(mem->virt_base + (mem->size << PAGE_SHIFT))) {
(mem->virt_base + ((dma_addr_t)mem->size << PAGE_SHIFT))) {
unsigned long off = vma->vm_pgoff;
int start = (vaddr - mem->virt_base) >> PAGE_SHIFT;
int user_count = vma_pages(vma);
unsigned long user_count = vma_pages(vma);
int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
*ret = -ENXIO;

25
kernel/dma/direct.c
View File

@@ -157,11 +157,8 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
ret = dma_common_contiguous_remap(page, PAGE_ALIGN(size),
dma_pgprot(dev, PAGE_KERNEL, attrs),
__builtin_return_address(0));
if (!ret) {
dma_free_contiguous(dev, page, size);
return ret;
}
if (!ret)
goto out_free_pages;
memset(ret, 0, size);
goto done;
}
@@ -174,8 +171,7 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
* so log an error and fail.
*/
dev_info(dev, "Rejecting highmem page from CMA.\n");
dma_free_contiguous(dev, page, size);
return NULL;
goto out_free_pages;
}
ret = page_address(page);
@@ -184,10 +180,12 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
memset(ret, 0, size);
if (IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) &&
if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
dma_alloc_need_uncached(dev, attrs)) {
arch_dma_prep_coherent(page, size);
ret = uncached_kernel_address(ret);
ret = arch_dma_set_uncached(ret, size);
if (IS_ERR(ret))
goto out_free_pages;
}
done:
if (force_dma_unencrypted(dev))
@@ -195,6 +193,9 @@ done:
else
*dma_handle = phys_to_dma(dev, page_to_phys(page));
return ret;
out_free_pages:
dma_free_contiguous(dev, page, size);
return NULL;
}
void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
@@ -218,6 +219,8 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr))
vunmap(cpu_addr);
else if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED))
arch_dma_clear_uncached(cpu_addr, size);
dma_free_contiguous(dev, dma_direct_to_page(dev, dma_addr), size);
}
@@ -225,7 +228,7 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
void *dma_direct_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
if (!IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) &&
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
dma_alloc_need_uncached(dev, attrs))
return arch_dma_alloc(dev, size, dma_handle, gfp, attrs);
@@ -235,7 +238,7 @@ void *dma_direct_alloc(struct device *dev, size_t size,
void dma_direct_free(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs)
{
if (!IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) &&
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) &&
!IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
dma_alloc_need_uncached(dev, attrs))
arch_dma_free(dev, size, cpu_addr, dma_addr, attrs);