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dma-direct: exclude dma_direct_map_resource from the min_low_pfn check 

The valid memory address check in dma_capable only makes sense when mapping
normal memory, not when using dma_map_resource to map a device resource.
Add a new boolean argument to dma_capable to exclude that check for the
dma_map_resource case.

Fixes: b12d66278d ("dma-direct: check for overflows on 32 bit DMA addresses")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Christoph Hellwig 2019-11-19 17:38:58 +01:00
parent 4268ac6ae5
commit 68a33b1794
5 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/amd_gart_64.c
View File

@ -185,13 +185,13 @@ static void iommu_full(struct device *dev, size_t size, int dir)
static inline int
need_iommu(struct device *dev, unsigned long addr, size_t size)
{
return force_iommu || !dma_capable(dev, addr, size);
return force_iommu || !dma_capable(dev, addr, size, true);
}
static inline int
nonforced_iommu(struct device *dev, unsigned long addr, size_t size)
{
return !dma_capable(dev, addr, size);
return !dma_capable(dev, addr, size, true);
}
/* Map a single continuous physical area into the IOMMU.

4
drivers/xen/swiotlb-xen.c
View File

@ -375,7 +375,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
* we can safely return the device addr and not worry about bounce
* buffering it.
*/
if (dma_capable(dev, dev_addr, size) &&
if (dma_capable(dev, dev_addr, size, true) &&
!range_straddles_page_boundary(phys, size) &&
!xen_arch_need_swiotlb(dev, phys, dev_addr) &&
swiotlb_force != SWIOTLB_FORCE)
@ -397,7 +397,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
/*
* Ensure that the address returned is DMA'ble
*/
if (unlikely(!dma_capable(dev, dev_addr, size))) {
if (unlikely(!dma_capable(dev, dev_addr, size, true))) {
swiotlb_tbl_unmap_single(dev, map, size, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
return DMA_MAPPING_ERROR;

5
include/linux/dma-direct.h
View File

@ -49,14 +49,15 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
return __sme_clr(__dma_to_phys(dev, daddr));
}
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
bool is_ram)
{
dma_addr_t end = addr + size - 1;
if (!dev->dma_mask)
return false;
if (!IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
return false;

4
kernel/dma/direct.c
View File

@ -363,7 +363,7 @@ static inline bool dma_direct_possible(struct device *dev, dma_addr_t dma_addr,
size_t size)
{
return swiotlb_force != SWIOTLB_FORCE &&
dma_capable(dev, dma_addr, size);
dma_capable(dev, dma_addr, size, true);
}
dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
@ -412,7 +412,7 @@ dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
{
dma_addr_t dma_addr = paddr;
if (unlikely(!dma_capable(dev, dma_addr, size))) {
if (unlikely(!dma_capable(dev, dma_addr, size, false))) {
report_addr(dev, dma_addr, size);
return DMA_MAPPING_ERROR;
}

2
kernel/dma/swiotlb.c
View File

@ -678,7 +678,7 @@ bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
/* Ensure that the address returned is DMA'ble */
*dma_addr = __phys_to_dma(dev, *phys);
if (unlikely(!dma_capable(dev, *dma_addr, size))) {
if (unlikely(!dma_capable(dev, *dma_addr, size, true))) {
swiotlb_tbl_unmap_single(dev, *phys, size, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
return false;