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dma-mapping fixes for 5.3-rc1

Browse source 
Fix various regressions:
 
  - force unencrypted dma-coherent buffers if encryption bit can't fit
    into the dma coherent mask (Tom Lendacky)
  - avoid limiting request size if swiotlb is not used (me)
  - fix swiotlb handling in dma_direct_sync_sg_for_cpu/device
    (Fugang Duan)
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Merge tag 'dma-mapping-5.3-1' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:
 "Fix various regressions:

   - force unencrypted dma-coherent buffers if encryption bit can't fit
     into the dma coherent mask (Tom Lendacky)

   - avoid limiting request size if swiotlb is not used (me)

   - fix swiotlb handling in dma_direct_sync_sg_for_cpu/device (Fugang
     Duan)"

* tag 'dma-mapping-5.3-1' of git://git.infradead.org/users/hch/dma-mapping:
  dma-direct: correct the physical addr in dma_direct_sync_sg_for_cpu/device
  dma-direct: only limit the mapping size if swiotlb could be used
  dma-mapping: add a dma_addressing_limited helper
  dma-direct: Force unencrypted DMA under SME for certain DMA masks
This commit is contained in:
Linus Torvalds 2019-07-20 12:09:52 -07:00
commit ac60602a6d
8 changed files with 83 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

3
kernel/dma/Kconfig
View file

@ -48,6 +48,9 @@ config ARCH_HAS_DMA_COHERENT_TO_PFN
config ARCH_HAS_DMA_MMAP_PGPROT
bool
config ARCH_HAS_FORCE_DMA_UNENCRYPTED
bool
config DMA_NONCOHERENT_CACHE_SYNC
bool

44
kernel/dma/direct.c
View file

@ -23,14 +23,6 @@
#define ARCH_ZONE_DMA_BITS 24
#endif
/*
* For AMD SEV all DMA must be to unencrypted addresses.
*/
static inline bool force_dma_unencrypted(void)
{
return sev_active();
}
static void report_addr(struct device *dev, dma_addr_t dma_addr, size_t size)
{
if (!dev->dma_mask) {
@ -46,7 +38,7 @@ static void report_addr(struct device *dev, dma_addr_t dma_addr, size_t size)
static inline dma_addr_t phys_to_dma_direct(struct device *dev,
phys_addr_t phys)
{
if (force_dma_unencrypted())
if (force_dma_unencrypted(dev))
return __phys_to_dma(dev, phys);
return phys_to_dma(dev, phys);
}
@ -67,7 +59,7 @@ static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
if (dev->bus_dma_mask && dev->bus_dma_mask < dma_mask)
dma_mask = dev->bus_dma_mask;
if (force_dma_unencrypted())
if (force_dma_unencrypted(dev))
*phys_mask = __dma_to_phys(dev, dma_mask);
else
*phys_mask = dma_to_phys(dev, dma_mask);
@ -159,7 +151,7 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
}
ret = page_address(page);
if (force_dma_unencrypted()) {
if (force_dma_unencrypted(dev)) {
set_memory_decrypted((unsigned long)ret, 1 << get_order(size));
*dma_handle = __phys_to_dma(dev, page_to_phys(page));
} else {
@ -192,7 +184,7 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
return;
}
if (force_dma_unencrypted())
if (force_dma_unencrypted(dev))
set_memory_encrypted((unsigned long)cpu_addr, 1 << page_order);
if (IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) &&
@ -242,12 +234,14 @@ void dma_direct_sync_sg_for_device(struct device *dev,
int i;
for_each_sg(sgl, sg, nents, i) {
if (unlikely(is_swiotlb_buffer(sg_phys(sg))))
swiotlb_tbl_sync_single(dev, sg_phys(sg), sg->length,
phys_addr_t paddr = dma_to_phys(dev, sg_dma_address(sg));
if (unlikely(is_swiotlb_buffer(paddr)))
swiotlb_tbl_sync_single(dev, paddr, sg->length,
dir, SYNC_FOR_DEVICE);
if (!dev_is_dma_coherent(dev))
arch_sync_dma_for_device(dev, sg_phys(sg), sg->length,
arch_sync_dma_for_device(dev, paddr, sg->length,
dir);
}
}
@ -279,11 +273,13 @@ void dma_direct_sync_sg_for_cpu(struct device *dev,
int i;
for_each_sg(sgl, sg, nents, i) {
phys_addr_t paddr = dma_to_phys(dev, sg_dma_address(sg));
if (!dev_is_dma_coherent(dev))
arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
if (unlikely(is_swiotlb_buffer(sg_phys(sg))))
swiotlb_tbl_sync_single(dev, sg_phys(sg), sg->length, dir,
arch_sync_dma_for_cpu(dev, paddr, sg->length, dir);
if (unlikely(is_swiotlb_buffer(paddr)))
swiotlb_tbl_sync_single(dev, paddr, sg->length, dir,
SYNC_FOR_CPU);
}
@ -407,11 +403,9 @@ int dma_direct_supported(struct device *dev, u64 mask)
size_t dma_direct_max_mapping_size(struct device *dev)
{
size_t size = SIZE_MAX;
/* If SWIOTLB is active, use its maximum mapping size */
if (is_swiotlb_active())
size = swiotlb_max_mapping_size(dev);
return size;
if (is_swiotlb_active() &&
(dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE))
return swiotlb_max_mapping_size(dev);
return SIZE_MAX;
}