diff options
Diffstat (limited to 'drivers/iommu/dma-iommu.c')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 52 |
1 files changed, 35 insertions, 17 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 98ba927aee1a..d0bc8c06e1a4 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -317,6 +317,30 @@ static bool dev_is_untrusted(struct device *dev) return dev_is_pci(dev) && to_pci_dev(dev)->untrusted; } +/* sysfs updates are serialised by the mutex of the group owning @domain */ +int iommu_dma_init_fq(struct iommu_domain *domain) +{ + struct iommu_dma_cookie *cookie = domain->iova_cookie; + int ret; + + if (cookie->fq_domain) + return 0; + + ret = init_iova_flush_queue(&cookie->iovad, iommu_dma_flush_iotlb_all, + iommu_dma_entry_dtor); + if (ret) { + pr_warn("iova flush queue initialization failed\n"); + return ret; + } + /* + * Prevent incomplete iovad->fq being observable. Pairs with path from + * __iommu_dma_unmap() through iommu_dma_free_iova() to queue_iova() + */ + smp_wmb(); + WRITE_ONCE(cookie->fq_domain, domain); + return 0; +} + /** * iommu_dma_init_domain - Initialise a DMA mapping domain * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie() @@ -370,17 +394,9 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, init_iova_domain(iovad, 1UL << order, base_pfn); - if (!cookie->fq_domain && (!dev || !dev_is_untrusted(dev)) && - domain->ops->flush_iotlb_all && !iommu_get_dma_strict(domain)) { - if (init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all, - iommu_dma_entry_dtor)) - pr_warn("iova flush queue initialization failed\n"); - else - cookie->fq_domain = domain; - } - - if (!dev) - return 0; + /* If the FQ fails we can simply fall back to strict mode */ + if (domain->type == IOMMU_DOMAIN_DMA_FQ && iommu_dma_init_fq(domain)) + domain->type = IOMMU_DOMAIN_DMA; return iova_reserve_iommu_regions(dev, domain); } @@ -455,17 +471,17 @@ static dma_addr_t iommu_dma_alloc_iova(struct iommu_domain *domain, } static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie, - dma_addr_t iova, size_t size, struct page *freelist) + dma_addr_t iova, size_t size, struct iommu_iotlb_gather *gather) { struct iova_domain *iovad = &cookie->iovad; /* The MSI case is only ever cleaning up its most recent allocation */ if (cookie->type == IOMMU_DMA_MSI_COOKIE) cookie->msi_iova -= size; - else if (cookie->fq_domain) /* non-strict mode */ + else if (gather && gather->queued) queue_iova(iovad, iova_pfn(iovad, iova), size >> iova_shift(iovad), - (unsigned long)freelist); + (unsigned long)gather->freelist); else free_iova_fast(iovad, iova_pfn(iovad, iova), size >> iova_shift(iovad)); @@ -484,13 +500,14 @@ static void __iommu_dma_unmap(struct device *dev, dma_addr_t dma_addr, dma_addr -= iova_off; size = iova_align(iovad, size + iova_off); iommu_iotlb_gather_init(&iotlb_gather); + iotlb_gather.queued = READ_ONCE(cookie->fq_domain); unmapped = iommu_unmap_fast(domain, dma_addr, size, &iotlb_gather); WARN_ON(unmapped != size); - if (!cookie->fq_domain) + if (!iotlb_gather.queued) iommu_iotlb_sync(domain, &iotlb_gather); - iommu_dma_free_iova(cookie, dma_addr, size, iotlb_gather.freelist); + iommu_dma_free_iova(cookie, dma_addr, size, &iotlb_gather); } static void __iommu_dma_unmap_swiotlb(struct device *dev, dma_addr_t dma_addr, @@ -768,6 +785,7 @@ static void iommu_dma_free_noncontiguous(struct device *dev, size_t size, __iommu_dma_unmap(dev, sgt->sgl->dma_address, size); __iommu_dma_free_pages(sh->pages, PAGE_ALIGN(size) >> PAGE_SHIFT); sg_free_table(&sh->sgt); + kfree(sh); } #endif /* CONFIG_DMA_REMAP */ @@ -1321,7 +1339,7 @@ void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit) * The IOMMU core code allocates the default DMA domain, which the * underlying IOMMU driver needs to support via the dma-iommu layer. */ - if (domain->type == IOMMU_DOMAIN_DMA) { + if (iommu_is_dma_domain(domain)) { if (iommu_dma_init_domain(domain, dma_base, dma_limit, dev)) goto out_err; dev->dma_ops = &iommu_dma_ops; |