swiotlb: don't assume PA 0 is invalid

In 2.6.29 io_tlb_orig_addr[] got converted from storing virtual addresses
to storing physical ones. While checking virtual addresses against NULL
is a legitimate thing to catch invalid entries, checking physical ones
against zero isn't: There's no guarantee that PFN 0 is reserved on a
particular platform.

Since it is unclear whether the check in swiotlb_tbl_unmap_single() is
actually needed, retain it but check against a guaranteed invalid physical
address. This requires setting up the array in a suitable fashion. And
since the original code failed to invalidate array entries when regions
get unmapped, this is being fixed at once along with adding a similar
check to swiotlb_tbl_sync_single().

Obviously the less intrusive change would be to simply drop the check in
swiotlb_tbl_unmap_single().

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jan Beulich 2014-06-02 14:58:25 +01:00 коммит произвёл Konrad Rzeszutek Wilk
Родитель 7171511eae
Коммит 8e0629c1d4
1 изменённых файлов: 18 добавлений и 10 удалений

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@ -86,6 +86,7 @@ static unsigned int io_tlb_index;
* We need to save away the original address corresponding to a mapped entry * We need to save away the original address corresponding to a mapped entry
* for the sync operations. * for the sync operations.
*/ */
#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
static phys_addr_t *io_tlb_orig_addr; static phys_addr_t *io_tlb_orig_addr;
/* /*
@ -188,12 +189,14 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
io_tlb_list = memblock_virt_alloc( io_tlb_list = memblock_virt_alloc(
PAGE_ALIGN(io_tlb_nslabs * sizeof(int)), PAGE_ALIGN(io_tlb_nslabs * sizeof(int)),
PAGE_SIZE); PAGE_SIZE);
for (i = 0; i < io_tlb_nslabs; i++)
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
io_tlb_index = 0;
io_tlb_orig_addr = memblock_virt_alloc( io_tlb_orig_addr = memblock_virt_alloc(
PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)), PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)),
PAGE_SIZE); PAGE_SIZE);
for (i = 0; i < io_tlb_nslabs; i++) {
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
}
io_tlb_index = 0;
if (verbose) if (verbose)
swiotlb_print_info(); swiotlb_print_info();
@ -313,10 +316,6 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
if (!io_tlb_list) if (!io_tlb_list)
goto cleanup3; goto cleanup3;
for (i = 0; i < io_tlb_nslabs; i++)
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
io_tlb_index = 0;
io_tlb_orig_addr = (phys_addr_t *) io_tlb_orig_addr = (phys_addr_t *)
__get_free_pages(GFP_KERNEL, __get_free_pages(GFP_KERNEL,
get_order(io_tlb_nslabs * get_order(io_tlb_nslabs *
@ -324,7 +323,11 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
if (!io_tlb_orig_addr) if (!io_tlb_orig_addr)
goto cleanup4; goto cleanup4;
memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t)); for (i = 0; i < io_tlb_nslabs; i++) {
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
}
io_tlb_index = 0;
swiotlb_print_info(); swiotlb_print_info();
@ -556,7 +559,8 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
/* /*
* First, sync the memory before unmapping the entry * First, sync the memory before unmapping the entry
*/ */
if (orig_addr && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) if (orig_addr != INVALID_PHYS_ADDR &&
((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE); swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE);
/* /*
@ -573,8 +577,10 @@ void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
* Step 1: return the slots to the free list, merging the * Step 1: return the slots to the free list, merging the
* slots with superceeding slots * slots with superceeding slots
*/ */
for (i = index + nslots - 1; i >= index; i--) for (i = index + nslots - 1; i >= index; i--) {
io_tlb_list[i] = ++count; io_tlb_list[i] = ++count;
io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
}
/* /*
* Step 2: merge the returned slots with the preceding slots, * Step 2: merge the returned slots with the preceding slots,
* if available (non zero) * if available (non zero)
@ -593,6 +599,8 @@ void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT; int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
phys_addr_t orig_addr = io_tlb_orig_addr[index]; phys_addr_t orig_addr = io_tlb_orig_addr[index];
if (orig_addr == INVALID_PHYS_ADDR)
return;
orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1); orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
switch (target) { switch (target) {