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dma-mapping fixes for Linux 6.0 

- revert a panic on swiotlb initialization failure (Yu Zhao)
  - fix the lookup for partial syncs in dma-debug (Robin Murphy)
  - fix a shift overflow in swiotlb (Chao Gao)
  - fix a comment typo in swiotlb (Chao Gao)
  - mark a function static now that all abusers are gone
    (Christoph Hellwig)
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Merge tag 'dma-mapping-6.0-2022-09-10' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:

 - revert a panic on swiotlb initialization failure (Yu Zhao)

 - fix the lookup for partial syncs in dma-debug (Robin Murphy)

 - fix a shift overflow in swiotlb (Chao Gao)

 - fix a comment typo in swiotlb (Chao Gao)

 - mark a function static now that all abusers are gone (Christoph
   Hellwig)

* tag 'dma-mapping-6.0-2022-09-10' of git://git.infradead.org/users/hch/dma-mapping:
  dma-mapping: mark dma_supported static
  swiotlb: fix a typo
  swiotlb: avoid potential left shift overflow
  dma-debug: improve search for partial syncs
  Revert "swiotlb: panic if nslabs is too small"
This commit is contained in:
Linus Torvalds 2022-09-10 12:18:19 -04:00
parent ce888220d5 9fc18f6d56
commit 16547b21b1
4 changed files with 9 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -139,7 +139,6 @@ int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
bool dma_can_mmap(struct device *dev);
int dma_supported(struct device *dev, u64 mask);
bool dma_pci_p2pdma_supported(struct device *dev);
int dma_set_mask(struct device *dev, u64 mask);
int dma_set_coherent_mask(struct device *dev, u64 mask);
@ -248,10 +247,6 @@ static inline bool dma_can_mmap(struct device *dev)
{
return false;
}
static inline int dma_supported(struct device *dev, u64 mask)
{
return 0;
}
static inline bool dma_pci_p2pdma_supported(struct device *dev)
{
return false;

6
kernel/dma/debug.c
View File

@ -350,11 +350,10 @@ static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
unsigned long *flags)
{
unsigned int max_range = dma_get_max_seg_size(ref->dev);
struct dma_debug_entry *entry, index = *ref;
unsigned int range = 0;
int limit = min(HASH_SIZE, (index.dev_addr >> HASH_FN_SHIFT) + 1);
while (range <= max_range) {
for (int i = 0; i < limit; i++) {
entry = __hash_bucket_find(*bucket, ref, containing_match);
if (entry)
@ -364,7 +363,6 @@ static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
* Nothing found, go back a hash bucket
*/
put_hash_bucket(*bucket, *flags);
range += (1 << HASH_FN_SHIFT);
index.dev_addr -= (1 << HASH_FN_SHIFT);
*bucket = get_hash_bucket(&index, flags);
}

3
kernel/dma/mapping.c
View File

@ -707,7 +707,7 @@ int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
}
EXPORT_SYMBOL_GPL(dma_mmap_noncontiguous);
int dma_supported(struct device *dev, u64 mask)
static int dma_supported(struct device *dev, u64 mask)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
@ -721,7 +721,6 @@ int dma_supported(struct device *dev, u64 mask)
return 1;
return ops->dma_supported(dev, mask);
}
EXPORT_SYMBOL(dma_supported);
bool dma_pci_p2pdma_supported(struct device *dev)
{

13
kernel/dma/swiotlb.c
View File

@ -326,9 +326,6 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
swiotlb_adjust_nareas(num_possible_cpus());
nslabs = default_nslabs;
if (nslabs < IO_TLB_MIN_SLABS)
panic("%s: nslabs = %lu too small\n", __func__, nslabs);
/*
* By default allocate the bounce buffer memory from low memory, but
* allow to pick a location everywhere for hypervisors with guest
@ -341,8 +338,7 @@ retry:
else
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb) {
pr_warn("%s: Failed to allocate %zu bytes tlb structure\n",
__func__, bytes);
pr_warn("%s: failed to allocate tlb structure\n", __func__);
return;
}
@ -579,7 +575,10 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size
}
}
#define slot_addr(start, idx) ((start) + ((idx) << IO_TLB_SHIFT))
static inline phys_addr_t slot_addr(phys_addr_t start, phys_addr_t idx)
{
return start + (idx << IO_TLB_SHIFT);
}
/*
* Carefully handle integer overflow which can occur when boundary_mask == ~0UL.
@ -765,7 +764,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
/*
* When dir == DMA_FROM_DEVICE we could omit the copy from the orig
* to the tlb buffer, if we knew for sure the device will
* overwirte the entire current content. But we don't. Thus
* overwrite the entire current content. But we don't. Thus
* unconditional bounce may prevent leaking swiotlb content (i.e.
* kernel memory) to user-space.
*/