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x86_64: abstract how we find the iommu_table for a device 

... in preparation for doing it differently for CalIOC2.

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Muli Ben-Yehuda 2007-07-21 17:10:51 +02:00 committed by Linus Torvalds
parent ff297b8c08
commit 35b6dfa087
1 changed files with 14 additions and 7 deletions
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21
arch/x86_64/kernel/pci-calgary.c
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@ -344,6 +344,15 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
spin_unlock_irqrestore(&tbl->it_lock, flags);
}
static inline struct iommu_table *find_iommu_table(struct device *dev)
{
struct iommu_table *tbl;
tbl = to_pci_dev(dev)->bus->self->sysdata;
return tbl;
}
static void __calgary_unmap_sg(struct iommu_table *tbl,
struct scatterlist *sglist, int nelems, int direction)
{
@ -365,7 +374,7 @@ void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, int direction)
{
unsigned long flags;
struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
struct iommu_table *tbl = find_iommu_table(dev);
if (!translate_phb(to_pci_dev(dev)))
return;
@ -394,7 +403,7 @@ static int calgary_nontranslate_map_sg(struct device* dev,
int calgary_map_sg(struct device *dev, struct scatterlist *sg,
int nelems, int direction)
{
struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
struct iommu_table *tbl = find_iommu_table(dev);
unsigned long flags;
unsigned long vaddr;
unsigned int npages;
@ -448,7 +457,7 @@ dma_addr_t calgary_map_single(struct device *dev, void *vaddr,
dma_addr_t dma_handle = bad_dma_address;
unsigned long uaddr;
unsigned int npages;
struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
struct iommu_table *tbl = find_iommu_table(dev);
uaddr = (unsigned long)vaddr;
npages = num_dma_pages(uaddr, size);
@ -464,7 +473,7 @@ dma_addr_t calgary_map_single(struct device *dev, void *vaddr,
void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
size_t size, int direction)
{
struct iommu_table *tbl = to_pci_dev(dev)->bus->self->sysdata;
struct iommu_table *tbl = find_iommu_table(dev);
unsigned int npages;
if (!translate_phb(to_pci_dev(dev)))
@ -480,9 +489,7 @@ void* calgary_alloc_coherent(struct device *dev, size_t size,
void *ret = NULL;
dma_addr_t mapping;
unsigned int npages, order;
struct iommu_table *tbl;
tbl = to_pci_dev(dev)->bus->self->sysdata;
struct iommu_table *tbl = find_iommu_table(dev);
size = PAGE_ALIGN(size); /* size rounded up to full pages */
npages = size >> PAGE_SHIFT;