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iommu/dma-iommu: Handle deferred devices

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Handle devices which defer their attach to the iommu in the dma-iommu api

Signed-off-by: Tom Murphy <murphyt7@tcd.ie>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Tom Murphy 2019-09-08 09:56:39 -07:00 committed by Joerg Roedel
parent 781ca2de89
commit 795bbbb9b6
1 changed files with 26 additions and 1 deletions
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27
drivers/iommu/dma-iommu.c
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@ -22,6 +22,7 @@
#include <linux/pci.h>
#include <linux/scatterlist.h>
#include <linux/vmalloc.h>
#include <linux/crash_dump.h>
struct iommu_dma_msi_page {
struct list_head list;
@ -353,6 +354,21 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
return iova_reserve_iommu_regions(dev, domain);
}
static int iommu_dma_deferred_attach(struct device *dev,
struct iommu_domain *domain)
{
const struct iommu_ops *ops = domain->ops;
if (!is_kdump_kernel())
return 0;
if (unlikely(ops->is_attach_deferred &&
ops->is_attach_deferred(domain, dev)))
return iommu_attach_device(domain, dev);
return 0;
}
/**
* dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API
* page flags.
@ -470,6 +486,9 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
size_t iova_off = iova_offset(iovad, phys);
dma_addr_t iova;
if (unlikely(iommu_dma_deferred_attach(dev, domain)))
return DMA_MAPPING_ERROR;
size = iova_align(iovad, size + iova_off);
iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
@ -579,6 +598,9 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size,
*dma_handle = DMA_MAPPING_ERROR;
if (unlikely(iommu_dma_deferred_attach(dev, domain)))
return NULL;
min_size = alloc_sizes & -alloc_sizes;
if (min_size < PAGE_SIZE) {
min_size = PAGE_SIZE;
@ -711,7 +733,7 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
int prot = dma_info_to_prot(dir, coherent, attrs);
dma_addr_t dma_handle;
dma_handle =__iommu_dma_map(dev, phys, size, prot);
dma_handle = __iommu_dma_map(dev, phys, size, prot);
if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
dma_handle != DMA_MAPPING_ERROR)
arch_sync_dma_for_device(dev, phys, size, dir);
@ -821,6 +843,9 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
unsigned long mask = dma_get_seg_boundary(dev);
int i;
if (unlikely(iommu_dma_deferred_attach(dev, domain)))
return 0;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
iommu_dma_sync_sg_for_device(dev, sg, nents, dir);