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| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2021-11-25 16:46:00 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2021-12-06 14:42:26 +0100 |
| commit | 568de506e31749ae9140c1a804f3b1d1ab47b4c2 (patch) | |
| tree | b8b530d2e892d9e7c83c48357c66129259b831f7 /drivers | |
| parent | 4e4dc65ab578c962ea898d475c0418ea29cc6b2f (diff) | |
| download | linux-568de506e31749ae9140c1a804f3b1d1ab47b4c2.tar.bz2 | |
s390/pci: use physical addresses in DMA tables
The entries in the DMA translation tables for our IOMMU must specify
physical addresses of either the next level table or the final page
to be mapped for DMA. Currently however the code simply passes the
virtual addresses of both. On the other hand we still need to walk the
tables via their virtual addresses so we need to do a phys_to_virt()
when setting the entries and a virt_to_phys() when getting them.
Similarly when passing the I/O translation anchor to the hardware we
must also specify its physical address.
As the DMA and IOMMU APIs we are implementing already use the correct
phys_addr_t type for the address to be mapped let's also thread this
through instead of treating it as just an unsigned long.
Note: this currently doesn't fix a real bug, since virtual addresses
are indentical to physical ones.
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/s390-iommu.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index 83df387e70a3..50860ebdd087 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -109,7 +109,7 @@ static int s390_iommu_attach_device(struct iommu_domain *domain, zdev->dma_table = s390_domain->dma_table; cc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, - (u64) zdev->dma_table); + virt_to_phys(zdev->dma_table)); if (cc) { rc = -EIO; goto out_restore; @@ -205,11 +205,11 @@ static void s390_iommu_release_device(struct device *dev) } static int s390_iommu_update_trans(struct s390_domain *s390_domain, - unsigned long pa, dma_addr_t dma_addr, + phys_addr_t pa, dma_addr_t dma_addr, size_t size, int flags) { struct s390_domain_device *domain_device; - u8 *page_addr = (u8 *) (pa & PAGE_MASK); + phys_addr_t page_addr = pa & PAGE_MASK; dma_addr_t start_dma_addr = dma_addr; unsigned long irq_flags, nr_pages, i; unsigned long *entry; @@ -274,7 +274,7 @@ static int s390_iommu_map(struct iommu_domain *domain, unsigned long iova, if (!(prot & IOMMU_WRITE)) flags |= ZPCI_TABLE_PROTECTED; - rc = s390_iommu_update_trans(s390_domain, (unsigned long) paddr, iova, + rc = s390_iommu_update_trans(s390_domain, paddr, iova, size, flags); return rc; @@ -324,7 +324,7 @@ static size_t s390_iommu_unmap(struct iommu_domain *domain, if (!paddr) return 0; - rc = s390_iommu_update_trans(s390_domain, (unsigned long) paddr, iova, + rc = s390_iommu_update_trans(s390_domain, paddr, iova, size, flags); if (rc) return 0; |