diff options
Diffstat (limited to 'arch/s390/pci/pci_dma.c')
| -rw-r--r-- | arch/s390/pci/pci_dma.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c index 0d300ee00f4e..2d15d84c20ed 100644 --- a/arch/s390/pci/pci_dma.c +++ b/arch/s390/pci/pci_dma.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright IBM Corp. 2012 * @@ -180,6 +181,9 @@ out_unlock: static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr, size_t size, int flags) { + unsigned long irqflags; + int ret; + /* * With zdev->tlb_refresh == 0, rpcit is not required to establish new * translations when previously invalid translation-table entries are @@ -195,8 +199,22 @@ static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr, return 0; } - return zpci_refresh_trans((u64) zdev->fh << 32, dma_addr, - PAGE_ALIGN(size)); + ret = zpci_refresh_trans((u64) zdev->fh << 32, dma_addr, + PAGE_ALIGN(size)); + if (ret == -ENOMEM && !s390_iommu_strict) { + /* enable the hypervisor to free some resources */ + if (zpci_refresh_global(zdev)) + goto out; + + spin_lock_irqsave(&zdev->iommu_bitmap_lock, irqflags); + bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap, + zdev->lazy_bitmap, zdev->iommu_pages); + bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages); + spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, irqflags); + ret = 0; + } +out: + return ret; } static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa, |