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Revert "iommu/amd: Remove the leftover of bypass support"

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This reverts commit 7a5dbf3ab2.

This commit not only removes the leftovers of bypass
support, it also mostly removes the checking of the return
value of the get_domain() function. This can lead to silent
data corruption bugs when a device is not attached to its
dma_ops domain and a DMA-API function is called for that
device.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2019-05-06 14:24:18 +02:00
parent 1a1079011d
commit 89736a0ee8
1 changed files with 63 additions and 17 deletions
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80
drivers/iommu/amd_iommu.c
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@ -2459,10 +2459,20 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
unsigned long attrs)
{
phys_addr_t paddr = page_to_phys(page) + offset;
struct protection_domain *domain = get_domain(dev);
struct dma_ops_domain *dma_dom = to_dma_ops_domain(domain);
struct protection_domain *domain;
struct dma_ops_domain *dma_dom;
u64 dma_mask;
return __map_single(dev, dma_dom, paddr, size, dir, *dev->dma_mask);
domain = get_domain(dev);
if (PTR_ERR(domain) == -EINVAL)
return (dma_addr_t)paddr;
else if (IS_ERR(domain))
return DMA_MAPPING_ERROR;
dma_mask = *dev->dma_mask;
dma_dom = to_dma_ops_domain(domain);
return __map_single(dev, dma_dom, paddr, size, dir, dma_mask);
}
/*
@ -2471,8 +2481,14 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction dir, unsigned long attrs)
{
struct protection_domain *domain = get_domain(dev);
struct dma_ops_domain *dma_dom = to_dma_ops_domain(domain);
struct protection_domain *domain;
struct dma_ops_domain *dma_dom;
domain = get_domain(dev);
if (IS_ERR(domain))
return;
dma_dom = to_dma_ops_domain(domain);
__unmap_single(dma_dom, dma_addr, size, dir);
}
@ -2512,13 +2528,20 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
unsigned long attrs)
{
int mapped_pages = 0, npages = 0, prot = 0, i;
struct protection_domain *domain = get_domain(dev);
struct dma_ops_domain *dma_dom = to_dma_ops_domain(domain);
struct protection_domain *domain;
struct dma_ops_domain *dma_dom;
struct scatterlist *s;
unsigned long address;
u64 dma_mask = *dev->dma_mask;
u64 dma_mask;
int ret;
domain = get_domain(dev);
if (IS_ERR(domain))
return 0;
dma_dom = to_dma_ops_domain(domain);
dma_mask = *dev->dma_mask;
npages = sg_num_pages(dev, sglist, nelems);
address = dma_ops_alloc_iova(dev, dma_dom, npages, dma_mask);
@ -2592,11 +2615,20 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction dir,
unsigned long attrs)
{
struct protection_domain *domain = get_domain(dev);
struct dma_ops_domain *dma_dom = to_dma_ops_domain(domain);
struct protection_domain *domain;
struct dma_ops_domain *dma_dom;
unsigned long startaddr;
int npages = 2;
__unmap_single(dma_dom, sg_dma_address(sglist) & PAGE_MASK,
sg_num_pages(dev, sglist, nelems) << PAGE_SHIFT, dir);
domain = get_domain(dev);
if (IS_ERR(domain))
return;
startaddr = sg_dma_address(sglist) & PAGE_MASK;
dma_dom = to_dma_ops_domain(domain);
npages = sg_num_pages(dev, sglist, nelems);
__unmap_single(dma_dom, startaddr, npages << PAGE_SHIFT, dir);
}
/*
@ -2607,11 +2639,16 @@ static void *alloc_coherent(struct device *dev, size_t size,
unsigned long attrs)
{
u64 dma_mask = dev->coherent_dma_mask;
struct protection_domain *domain = get_domain(dev);
struct protection_domain *domain;
struct dma_ops_domain *dma_dom;
struct page *page;
if (IS_ERR(domain))
domain = get_domain(dev);
if (PTR_ERR(domain) == -EINVAL) {
page = alloc_pages(flag, get_order(size));
*dma_addr = page_to_phys(page);
return page_address(page);
} else if (IS_ERR(domain))
return NULL;
dma_dom = to_dma_ops_domain(domain);
@ -2657,13 +2694,22 @@ static void free_coherent(struct device *dev, size_t size,
void *virt_addr, dma_addr_t dma_addr,
unsigned long attrs)
{
struct protection_domain *domain = get_domain(dev);
struct dma_ops_domain *dma_dom = to_dma_ops_domain(domain);
struct page *page = virt_to_page(virt_addr);
struct protection_domain *domain;
struct dma_ops_domain *dma_dom;
struct page *page;
page = virt_to_page(virt_addr);
size = PAGE_ALIGN(size);
domain = get_domain(dev);
if (IS_ERR(domain))
goto free_mem;
dma_dom = to_dma_ops_domain(domain);
__unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL);
free_mem:
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
__free_pages(page, get_order(size));
}