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x86: Kill bad_dma_address variable

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This kills bad_dma_address variable, the old mechanism to enable
IOMMU drivers to make dma_mapping_error() work in IOMMU's
specific way.

bad_dma_address variable was introduced to enable IOMMU drivers
to make dma_mapping_error() work in IOMMU's specific way.
However, it can't handle systems that use both swiotlb and HW
IOMMU. SO we introduced dma_map_ops->mapping_error to solve that
case.

Intel VT-d, GART, and swiotlb already use
dma_map_ops->mapping_error. Calgary, AMD IOMMU, and nommu use
zero for an error dma address. This adds DMA_ERROR_CODE and
converts them to use it (as SPARC and POWER does).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: muli@il.ibm.com
Cc: joerg.roedel@amd.com
LKML-Reference: <1258287594-8777-3-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori
2009-11-15 21:19:53 +09:00
committed by Ingo Molnar
parent 42109197eb
commit 8fd524b355
5 changed files with 24 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
arch/x86/kernel/amd_iommu.c
View File

@@ -928,7 +928,7 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
}
if (unlikely(address == -1))
address = bad_dma_address;
address = DMA_ERROR_CODE;
WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size);
@@ -1544,7 +1544,7 @@ static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu,
pte = dma_ops_get_pte(dom, address);
if (!pte)
return bad_dma_address;
return DMA_ERROR_CODE;
__pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
@@ -1625,7 +1625,7 @@ static dma_addr_t __map_single(struct device *dev,
retry:
address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask,
dma_mask);
if (unlikely(address == bad_dma_address)) {
if (unlikely(address == DMA_ERROR_CODE)) {
/*
* setting next_address here will let the address
* allocator only scan the new allocated range in the
@@ -1646,7 +1646,7 @@ retry:
start = address;
for (i = 0; i < pages; ++i) {
ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);
if (ret == bad_dma_address)
if (ret == DMA_ERROR_CODE)
goto out_unmap;
paddr += PAGE_SIZE;
@@ -1674,7 +1674,7 @@ out_unmap:
dma_ops_free_addresses(dma_dom, address, pages);
return bad_dma_address;
return DMA_ERROR_CODE;
}
/*
@@ -1690,7 +1690,7 @@ static void __unmap_single(struct amd_iommu *iommu,
dma_addr_t i, start;
unsigned int pages;
if ((dma_addr == bad_dma_address) ||
if ((dma_addr == DMA_ERROR_CODE) ||
(dma_addr + size > dma_dom->aperture_size))
return;
@@ -1732,7 +1732,7 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
INC_STATS_COUNTER(cnt_map_single);
if (!check_device(dev))
return bad_dma_address;
return DMA_ERROR_CODE;
dma_mask = *dev->dma_mask;
@@ -1743,12 +1743,12 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
return (dma_addr_t)paddr;
if (!dma_ops_domain(domain))
return bad_dma_address;
return DMA_ERROR_CODE;
spin_lock_irqsave(&domain->lock, flags);
addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false,
dma_mask);
if (addr == bad_dma_address)
if (addr == DMA_ERROR_CODE)
goto out;
iommu_completion_wait(iommu);
@@ -1957,7 +1957,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
*dma_addr = __map_single(dev, iommu, domain->priv, paddr,
size, DMA_BIDIRECTIONAL, true, dma_mask);
if (*dma_addr == bad_dma_address) {
if (*dma_addr == DMA_ERROR_CODE) {
spin_unlock_irqrestore(&domain->lock, flags);
goto out_free;
}
@@ -2110,7 +2110,6 @@ int __init amd_iommu_init_dma_ops(void)
prealloc_protection_domains();
iommu_detected = 1;
bad_dma_address = 0;
swiotlb = 0;
#ifdef CONFIG_GART_IOMMU
gart_iommu_aperture_disabled = 1;