diff options
Diffstat (limited to 'arch/s390/pci/pci_dma.c')
| -rw-r--r-- | arch/s390/pci/pci_dma.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index d348f2c09a1e..4638b93c7632 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -366,8 +366,7 @@ static void *s390_dma_alloc(struct device *dev, size_t size, pa = page_to_phys(page); memset((void *) pa, 0, size); - map = s390_dma_map_pages(dev, page, pa % PAGE_SIZE, - size, DMA_BIDIRECTIONAL, NULL); + map = s390_dma_map_pages(dev, page, 0, size, DMA_BIDIRECTIONAL, NULL); if (dma_mapping_error(dev, map)) { free_pages(pa, get_order(size)); return NULL; @@ -458,7 +457,19 @@ int zpci_dma_init_device(struct zpci_dev *zdev) goto out_clean; } - zdev->iommu_size = (unsigned long) high_memory - PAGE_OFFSET; + /* + * Restrict the iommu bitmap size to the minimum of the following: + * - main memory size + * - 3-level pagetable address limit minus start_dma offset + * - DMA address range allowed by the hardware (clp query pci fn) + * + * Also set zdev->end_dma to the actual end address of the usable + * range, instead of the theoretical maximum as reported by hardware. + */ + zdev->iommu_size = min3((u64) high_memory, + ZPCI_TABLE_SIZE_RT - zdev->start_dma, + zdev->end_dma - zdev->start_dma + 1); + zdev->end_dma = zdev->start_dma + zdev->iommu_size - 1; zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT; zdev->iommu_bitmap = vzalloc(zdev->iommu_pages / 8); if (!zdev->iommu_bitmap) { @@ -466,10 +477,7 @@ int zpci_dma_init_device(struct zpci_dev *zdev) goto out_reg; } - rc = zpci_register_ioat(zdev, - 0, - zdev->start_dma + PAGE_OFFSET, - zdev->start_dma + zdev->iommu_size - 1, + rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma, (u64) zdev->dma_table); if (rc) goto out_reg; |