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amd-iommu: change dma_dom->next_bit to dma_dom->next_address

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Simplify the code a little bit by using the same unit for all address
space related state in the dma_ops domain structure.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-05-18 15:32:48 +02:00
parent 384de72910
commit 803b8cb4d9
2 changed files with 10 additions and 9 deletions
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2
arch/x86/include/asm/amd_iommu_types.h
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@ -249,7 +249,7 @@ struct dma_ops_domain {
unsigned long aperture_size;
/* address we start to search for free addresses */
unsigned long next_bit;
unsigned long next_address;
/* address space relevant data */
struct aperture_range *aperture[APERTURE_MAX_RANGES];

17
arch/x86/kernel/amd_iommu.c
View file

@ -627,13 +627,15 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
u64 dma_mask,
unsigned long start)
{
unsigned long next_bit = dom->next_bit % APERTURE_RANGE_PAGES;
unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE;
int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT;
int i = start >> APERTURE_RANGE_SHIFT;
unsigned long boundary_size;
unsigned long address = -1;
unsigned long limit;
next_bit >>= PAGE_SHIFT;
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
PAGE_SIZE) >> PAGE_SHIFT;
@ -652,7 +654,7 @@ static unsigned long dma_ops_area_alloc(struct device *dev,
if (address != -1) {
address = dom->aperture[i]->offset +
(address << PAGE_SHIFT);
dom->next_bit = (address >> PAGE_SHIFT) + pages;
dom->next_address = address + (pages << PAGE_SHIFT);
break;
}
@ -669,14 +671,12 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
u64 dma_mask)
{
unsigned long address;
unsigned long start = dom->next_bit << PAGE_SHIFT;
address = dma_ops_area_alloc(dev, dom, pages, align_mask,
dma_mask, start);
dma_mask, dom->next_address);
if (address == -1) {
dom->next_bit = 0;
dom->next_address = 0;
address = dma_ops_area_alloc(dev, dom, pages, align_mask,
dma_mask, 0);
dom->need_flush = true;
@ -704,10 +704,11 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL);
if ((address >> PAGE_SHIFT) >= dom->next_bit)
if (address >= dom->next_address)
dom->need_flush = true;
address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT;
iommu_area_free(range->bitmap, address, pages);
}
@ -870,7 +871,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu,
* a valid dma-address. So we can use 0 as error value
*/
dma_dom->aperture[0]->bitmap[0] = 1;
dma_dom->next_bit = 0;
dma_dom->next_address = 0;
dma_dom->need_flush = false;
dma_dom->target_dev = 0xffff;