intel-iommu: Ensure that PTE writes are 64-bit atomic, even on i386
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
parent
3238c0c4d6
commit
c85994e477
|
@ -222,7 +222,12 @@ static inline void dma_set_pte_prot(struct dma_pte *pte, unsigned long prot)
|
|||
|
||||
static inline u64 dma_pte_addr(struct dma_pte *pte)
|
||||
{
|
||||
return (pte->val & VTD_PAGE_MASK);
|
||||
#ifdef CONFIG_64BIT
|
||||
return pte->val & VTD_PAGE_MASK;
|
||||
#else
|
||||
/* Must have a full atomic 64-bit read */
|
||||
return __cmpxchg64(pte, 0ULL, 0ULL) & VTD_PAGE_MASK;
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void dma_set_pte_pfn(struct dma_pte *pte, unsigned long pfn)
|
||||
|
@ -712,6 +717,8 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
|
|||
break;
|
||||
|
||||
if (!dma_pte_present(pte)) {
|
||||
uint64_t pteval;
|
||||
|
||||
tmp_page = alloc_pgtable_page();
|
||||
|
||||
if (!tmp_page) {
|
||||
|
@ -719,16 +726,16 @@ static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain,
|
|||
flags);
|
||||
return NULL;
|
||||
}
|
||||
domain_flush_cache(domain, tmp_page, PAGE_SIZE);
|
||||
dma_set_pte_pfn(pte, virt_to_dma_pfn(tmp_page));
|
||||
/*
|
||||
* high level table always sets r/w, last level page
|
||||
* table control read/write
|
||||
*/
|
||||
dma_set_pte_readable(pte);
|
||||
dma_set_pte_writable(pte);
|
||||
domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE);
|
||||
pteval = (virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE;
|
||||
if (cmpxchg64(&pte->val, 0ULL, pteval)) {
|
||||
/* Someone else set it while we were thinking; use theirs. */
|
||||
free_pgtable_page(tmp_page);
|
||||
} else {
|
||||
dma_pte_addr(pte);
|
||||
domain_flush_cache(domain, pte, sizeof(*pte));
|
||||
}
|
||||
}
|
||||
parent = phys_to_virt(dma_pte_addr(pte));
|
||||
level--;
|
||||
}
|
||||
|
@ -1666,6 +1673,8 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
|
|||
}
|
||||
|
||||
while (nr_pages--) {
|
||||
uint64_t tmp;
|
||||
|
||||
if (!sg_res) {
|
||||
sg_res = (sg->offset + sg->length + VTD_PAGE_SIZE - 1) >> VTD_PAGE_SHIFT;
|
||||
sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset;
|
||||
|
@ -1680,17 +1689,17 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
|
|||
/* We don't need lock here, nobody else
|
||||
* touches the iova range
|
||||
*/
|
||||
if (unlikely(dma_pte_addr(pte))) {
|
||||
tmp = cmpxchg64(&pte->val, 0ULL, pteval);
|
||||
if (tmp) {
|
||||
static int dumps = 5;
|
||||
printk(KERN_CRIT "ERROR: DMA PTE for vPFN 0x%lx already set (to %llx)\n",
|
||||
iov_pfn, pte->val);
|
||||
printk(KERN_CRIT "ERROR: DMA PTE for vPFN 0x%lx already set (to %llx not %llx)\n",
|
||||
iov_pfn, tmp, (unsigned long long)pteval);
|
||||
if (dumps) {
|
||||
dumps--;
|
||||
debug_dma_dump_mappings(NULL);
|
||||
}
|
||||
WARN_ON(1);
|
||||
}
|
||||
pte->val = pteval;
|
||||
pte++;
|
||||
if (!nr_pages ||
|
||||
(unsigned long)pte >> VTD_PAGE_SHIFT !=
|
||||
|
|
Loading…
Reference in a new issue