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Subject[PATCH] intel-iommu: use coherent_dma_mask in alloc_coherent
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This patch fixes intel-iommu to use dev->coherent_dma_mask in
alloc_coherent. Currently, intel-iommu uses dev->dma_mask in
alloc_coherent but alloc_coherent is supposed to use
coherent_dma_mask. It could break drivers that uses smaller
coherent_dma_mask than dma_mask (though the current code works for the
majority that use the same mask for coherent_dma_mask and dma_mask).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
drivers/pci/intel-iommu.c | 30 ++++++++++++++++++++----------
1 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 389fdd6..68a97bc 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1759,14 +1759,14 @@ iommu_alloc_iova(struct dmar_domain *domain, size_t size, u64 end)

static struct iova *
__intel_alloc_iova(struct device *dev, struct dmar_domain *domain,
- size_t size)
+ size_t size, unsigned long dma_mask)
{
struct pci_dev *pdev = to_pci_dev(dev);
struct iova *iova = NULL;

- if ((pdev->dma_mask <= DMA_32BIT_MASK) || (dmar_forcedac)) {
- iova = iommu_alloc_iova(domain, size, pdev->dma_mask);
- } else {
+ if (dma_mask <= DMA_32BIT_MASK || dmar_forcedac)
+ iova = iommu_alloc_iova(domain, size, dma_mask);
+ else {
/*
* First try to allocate an io virtual address in
* DMA_32BIT_MASK and if that fails then try allocating
@@ -1774,7 +1774,7 @@ __intel_alloc_iova(struct device *dev, struct dmar_domain *domain,
*/
iova = iommu_alloc_iova(domain, size, DMA_32BIT_MASK);
if (!iova)
- iova = iommu_alloc_iova(domain, size, pdev->dma_mask);
+ iova = iommu_alloc_iova(domain, size, dma_mask);
}

if (!iova) {
@@ -1813,8 +1813,9 @@ get_valid_domain_for_dev(struct pci_dev *pdev)
return domain;
}

-static dma_addr_t
-intel_map_single(struct device *hwdev, phys_addr_t paddr, size_t size, int dir)
+static dma_addr_t __intel_map_single(struct device *hwdev, phys_addr_t paddr,
+ size_t size, int dir,
+ unsigned long dma_mask)
{
struct pci_dev *pdev = to_pci_dev(hwdev);
struct dmar_domain *domain;
@@ -1833,7 +1834,7 @@ intel_map_single(struct device *hwdev, phys_addr_t paddr, size_t size, int dir)

size = aligned_size((u64)paddr, size);

- iova = __intel_alloc_iova(hwdev, domain, size);
+ iova = __intel_alloc_iova(hwdev, domain, size, pdev->dma_mask);
if (!iova)
goto error;

@@ -1879,6 +1880,13 @@ error:
return 0;
}

+static dma_addr_t
+intel_map_single(struct device *hwdev, phys_addr_t paddr, size_t size, int dir)
+{
+ return __intel_map_single(hwdev, paddr, size, dir,
+ to_pci_dev(hwdev)->dma_mask);
+}
+
static void flush_unmaps(void)
{
int i, j;
@@ -1993,7 +2001,9 @@ static void * intel_alloc_coherent(struct device *hwdev, size_t size,
return NULL;
memset(vaddr, 0, size);

- *dma_handle = intel_map_single(hwdev, virt_to_bus(vaddr), size, DMA_BIDIRECTIONAL);
+ *dma_handle = __intel_map_single(hwdev, virt_to_bus(vaddr), size,
+ DMA_BIDIRECTIONAL,
+ hwdev->coherent_dma_mask);
if (*dma_handle)
return vaddr;
free_pages((unsigned long)vaddr, order);
@@ -2096,7 +2106,7 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist,
size += aligned_size((u64)addr, sg->length);
}

- iova = __intel_alloc_iova(hwdev, domain, size);
+ iova = __intel_alloc_iova(hwdev, domain, size, pdev->dma_mask);
if (!iova) {
sglist->dma_length = 0;
return 0;
--
1.5.5.GIT


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