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authorJoerg Roedel <jroedel@suse.de>2019-09-25 16:23:00 +0300
committerJoerg Roedel <jroedel@suse.de>2019-09-28 15:44:13 +0300
commit2a78f9962565e53b78363eaf516eb052009e8020 (patch)
tree7d33ccd62917126b896ba4e54b25c697ecc7babd /drivers/iommu
parentab7b2577f0d119052b98b8d913bad369ac2760eb (diff)
downloadlinux-2a78f9962565e53b78363eaf516eb052009e8020.tar.xz
iommu/amd: Lock code paths traversing protection_domain->dev_list
The traversing of this list requires protection_domain->lock to be taken to avoid nasty races with attach/detach code. Make sure the lock is held on all code-paths traversing this list. Reported-by: Filippo Sironi <sironi@amazon.de> Fixes: 92d420ec028d ("iommu/amd: Relax locking in dma_ops path") Reviewed-by: Filippo Sironi <sironi@amazon.de> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index bac4e20a5919..9c26976a0f99 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1334,8 +1334,12 @@ static void domain_flush_np_cache(struct protection_domain *domain,
dma_addr_t iova, size_t size)
{
if (unlikely(amd_iommu_np_cache)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&domain->lock, flags);
domain_flush_pages(domain, iova, size);
domain_flush_complete(domain);
+ spin_unlock_irqrestore(&domain->lock, flags);
}
}
@@ -1700,8 +1704,13 @@ static int iommu_map_page(struct protection_domain *dom,
ret = 0;
out:
- if (updated)
+ if (updated) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&dom->lock, flags);
update_domain(dom);
+ spin_unlock_irqrestore(&dom->lock, flags);
+ }
/* Everything flushed out, free pages now */
free_page_list(freelist);
@@ -1857,8 +1866,12 @@ static void free_gcr3_table(struct protection_domain *domain)
static void dma_ops_domain_flush_tlb(struct dma_ops_domain *dom)
{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dom->domain.lock, flags);
domain_flush_tlb(&dom->domain);
domain_flush_complete(&dom->domain);
+ spin_unlock_irqrestore(&dom->domain.lock, flags);
}
static void iova_domain_flush_tlb(struct iova_domain *iovad)
@@ -2414,6 +2427,7 @@ static dma_addr_t __map_single(struct device *dev,
{
dma_addr_t offset = paddr & ~PAGE_MASK;
dma_addr_t address, start, ret;
+ unsigned long flags;
unsigned int pages;
int prot = 0;
int i;
@@ -2451,8 +2465,10 @@ out_unmap:
iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE);
}
+ spin_lock_irqsave(&dma_dom->domain.lock, flags);
domain_flush_tlb(&dma_dom->domain);
domain_flush_complete(&dma_dom->domain);
+ spin_unlock_irqrestore(&dma_dom->domain.lock, flags);
dma_ops_free_iova(dma_dom, address, pages);
@@ -2481,8 +2497,12 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
}
if (amd_iommu_unmap_flush) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&dma_dom->domain.lock, flags);
domain_flush_tlb(&dma_dom->domain);
domain_flush_complete(&dma_dom->domain);
+ spin_unlock_irqrestore(&dma_dom->domain.lock, flags);
dma_ops_free_iova(dma_dom, dma_addr, pages);
} else {
pages = __roundup_pow_of_two(pages);
@@ -3246,9 +3266,12 @@ static bool amd_iommu_is_attach_deferred(struct iommu_domain *domain,
static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain)
{
struct protection_domain *dom = to_pdomain(domain);
+ unsigned long flags;
+ spin_lock_irqsave(&dom->lock, flags);
domain_flush_tlb_pde(dom);
domain_flush_complete(dom);
+ spin_unlock_irqrestore(&dom->lock, flags);
}
static void amd_iommu_iotlb_sync(struct iommu_domain *domain,