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Merge branch 'for-linus-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb

Browse Source 
Pull swiotlb updates from Konrad Rzeszutek Wilk:
 "One compiler fix, and a bug-fix in swiotlb_nr_tbl() and
  swiotlb_max_segment() to check also for no_iotlb_memory"

* 'for-linus-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb:
  swiotlb: fix phys_addr_t overflow warning
  swiotlb: Return consistent SWIOTLB segments/nr_tbl
  swiotlb: Group identical cleanup in swiotlb_cleanup()
This commit is contained in:
Linus Torvalds 2019-07-18 11:48:05 -07:00
commit d4df33b0e9
2 changed files with 17 additions and 15 deletions
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2
drivers/xen/swiotlb-xen.c
View File

@ -402,7 +402,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir,
attrs);
if (map == DMA_MAPPING_ERROR)
if (map == (phys_addr_t)DMA_MAPPING_ERROR)
return DMA_MAPPING_ERROR;
dev_addr = xen_phys_to_bus(map);

30
kernel/dma/swiotlb.c
View File

@ -129,15 +129,17 @@ setup_io_tlb_npages(char *str)
}
early_param("swiotlb", setup_io_tlb_npages);
static bool no_iotlb_memory;
unsigned long swiotlb_nr_tbl(void)
{
return io_tlb_nslabs;
return unlikely(no_iotlb_memory) ? 0 : io_tlb_nslabs;
}
EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
unsigned int swiotlb_max_segment(void)
{
return max_segment;
return unlikely(no_iotlb_memory) ? 0 : max_segment;
}
EXPORT_SYMBOL_GPL(swiotlb_max_segment);
@ -160,8 +162,6 @@ unsigned long swiotlb_size_or_default(void)
return size ? size : (IO_TLB_DEFAULT_SIZE);
}
static bool no_iotlb_memory;
void swiotlb_print_info(void)
{
unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
@ -317,6 +317,14 @@ swiotlb_late_init_with_default_size(size_t default_size)
return rc;
}
static void swiotlb_cleanup(void)
{
io_tlb_end = 0;
io_tlb_start = 0;
io_tlb_nslabs = 0;
max_segment = 0;
}
int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
@ -367,10 +375,7 @@ cleanup4:
sizeof(int)));
io_tlb_list = NULL;
cleanup3:
io_tlb_end = 0;
io_tlb_start = 0;
io_tlb_nslabs = 0;
max_segment = 0;
swiotlb_cleanup();
return -ENOMEM;
}
@ -394,10 +399,7 @@ void __init swiotlb_exit(void)
memblock_free_late(io_tlb_start,
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
}
io_tlb_start = 0;
io_tlb_end = 0;
io_tlb_nslabs = 0;
max_segment = 0;
swiotlb_cleanup();
}
/*
@ -546,7 +548,7 @@ not_found:
if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n",
size, io_tlb_nslabs, tmp_io_tlb_used);
return DMA_MAPPING_ERROR;
return (phys_addr_t)DMA_MAPPING_ERROR;
found:
io_tlb_used += nslots;
spin_unlock_irqrestore(&io_tlb_lock, flags);
@ -664,7 +666,7 @@ bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
/* Oh well, have to allocate and map a bounce buffer. */
*phys = swiotlb_tbl_map_single(dev, __phys_to_dma(dev, io_tlb_start),
*phys, size, dir, attrs);
if (*phys == DMA_MAPPING_ERROR)
if (*phys == (phys_addr_t)DMA_MAPPING_ERROR)
return false;
/* Ensure that the address returned is DMA'ble */