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x86: Kill bad_dma_address variable 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/x86/include/asm/dma-mapping.h
View File

@ -20,7 +20,8 @@
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
#endif
extern dma_addr_t bad_dma_address;
#define DMA_ERROR_CODE 0
extern int iommu_merge;
extern struct device x86_dma_fallback_dev;
extern int panic_on_overflow;
@ -48,7 +49,7 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
if (ops->mapping_error)
return ops->mapping_error(dev, dma_addr);
return (dma_addr == bad_dma_address);
return (dma_addr == DMA_ERROR_CODE);
}
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)

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;

22
arch/x86/kernel/pci-calgary_64.c
View File

@ -245,7 +245,7 @@ static unsigned long iommu_range_alloc(struct device *dev,
if (panic_on_overflow)
panic("Calgary: fix the allocator.\n");
else
return bad_dma_address;
return DMA_ERROR_CODE;
}
}
@ -261,11 +261,11 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
void *vaddr, unsigned int npages, int direction)
{
unsigned long entry;
dma_addr_t ret = bad_dma_address;
dma_addr_t ret = DMA_ERROR_CODE;
entry = iommu_range_alloc(dev, tbl, npages);
if (unlikely(entry == bad_dma_address))
if (unlikely(entry == DMA_ERROR_CODE))
goto error;
/* set the return dma address */
@ -280,7 +280,7 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
error:
printk(KERN_WARNING "Calgary: failed to allocate %u pages in "
"iommu %p\n", npages, tbl);
return bad_dma_address;
return DMA_ERROR_CODE;
}
static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
@ -291,8 +291,8 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
unsigned long flags;
/* were we called with bad_dma_address? */
badend = bad_dma_address + (EMERGENCY_PAGES * PAGE_SIZE);
if (unlikely((dma_addr >= bad_dma_address) && (dma_addr < badend))) {
badend = DMA_ERROR_CODE + (EMERGENCY_PAGES * PAGE_SIZE);
if (unlikely((dma_addr >= DMA_ERROR_CODE) && (dma_addr < badend))) {
WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
"address 0x%Lx\n", dma_addr);
return;
@ -374,7 +374,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);
entry = iommu_range_alloc(dev, tbl, npages);
if (entry == bad_dma_address) {
if (entry == DMA_ERROR_CODE) {
/* makes sure unmap knows to stop */
s->dma_length = 0;
goto error;
@ -392,7 +392,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
error:
calgary_unmap_sg(dev, sg, nelems, dir, NULL);
for_each_sg(sg, s, nelems, i) {
sg->dma_address = bad_dma_address;
sg->dma_address = DMA_ERROR_CODE;
sg->dma_length = 0;
}
return 0;
@ -447,7 +447,7 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size,
/* set up tces to cover the allocated range */
mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
if (mapping == bad_dma_address)
if (mapping == DMA_ERROR_CODE)
goto free;
*dma_handle = mapping;
return ret;
@ -728,7 +728,7 @@ static void __init calgary_reserve_regions(struct pci_dev *dev)
struct iommu_table *tbl = pci_iommu(dev->bus);
/* reserve EMERGENCY_PAGES from bad_dma_address and up */
iommu_range_reserve(tbl, bad_dma_address, EMERGENCY_PAGES);
iommu_range_reserve(tbl, DMA_ERROR_CODE, EMERGENCY_PAGES);
/* avoid the BIOS/VGA first 640KB-1MB region */
/* for CalIOC2 - avoid the entire first MB */
@ -1359,8 +1359,6 @@ static int __init calgary_iommu_init(void)
return ret;
}
bad_dma_address = 0x0;
return 0;
}

3
arch/x86/kernel/pci-dma.c
View File

@ -43,9 +43,6 @@ int iommu_detected __read_mostly = 0;
*/
int iommu_pass_through __read_mostly;
dma_addr_t bad_dma_address __read_mostly = 0;
EXPORT_SYMBOL(bad_dma_address);
/* Dummy device used for NULL arguments (normally ISA). */
struct device x86_dma_fallback_dev = {
.init_name = "fallback device",

2
arch/x86/kernel/pci-nommu.c
View File

@ -33,7 +33,7 @@ static dma_addr_t nommu_map_page(struct device *dev, struct page *page,
dma_addr_t bus = page_to_phys(page) + offset;
WARN_ON(size == 0);
if (!check_addr("map_single", dev, bus, size))
return bad_dma_address;
return DMA_ERROR_CODE;
flush_write_buffers();
return bus;
}