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x86-64: update pci-gart iommu to sg helpers 

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-10-04 09:35:37 +02:00
parent b922f53bd0
commit 9ee1bea469
1 changed files with 36 additions and 29 deletions
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65
arch/x86/kernel/pci-gart_64.c
View File

@ -23,6 +23,7 @@
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/kdebug.h>
#include <linux/scatterlist.h>
#include <asm/atomic.h>
#include <asm/io.h>
#include <asm/mtrr.h>
@ -278,10 +279,10 @@ static void gart_unmap_single(struct device *dev, dma_addr_t dma_addr,
*/
static void gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
{
struct scatterlist *s;
int i;
for (i = 0; i < nents; i++) {
struct scatterlist *s = &sg[i];
for_each_sg(sg, s, nents, i) {
if (!s->dma_length || !s->length)
break;
gart_unmap_single(dev, s->dma_address, s->dma_length, dir);
@ -292,14 +293,14 @@ static void gart_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
static int dma_map_sg_nonforce(struct device *dev, struct scatterlist *sg,
int nents, int dir)
{
struct scatterlist *s;
int i;
#ifdef CONFIG_IOMMU_DEBUG
printk(KERN_DEBUG "dma_map_sg overflow\n");
#endif
for (i = 0; i < nents; i++ ) {
struct scatterlist *s = &sg[i];
for_each_sg(sg, s, nents, i) {
unsigned long addr = page_to_phys(s->page) + s->offset;
if (nonforced_iommu(dev, addr, s->length)) {
addr = dma_map_area(dev, addr, s->length, dir);
@ -319,23 +320,23 @@ static int dma_map_sg_nonforce(struct device *dev, struct scatterlist *sg,
}
/* Map multiple scatterlist entries continuous into the first. */
static int __dma_map_cont(struct scatterlist *sg, int start, int stopat,
static int __dma_map_cont(struct scatterlist *start, int nelems,
struct scatterlist *sout, unsigned long pages)
{
unsigned long iommu_start = alloc_iommu(pages);
unsigned long iommu_page = iommu_start;
struct scatterlist *s;
int i;
if (iommu_start == -1)
return -1;
for (i = start; i < stopat; i++) {
struct scatterlist *s = &sg[i];
for_each_sg(start, s, nelems, i) {
unsigned long pages, addr;
unsigned long phys_addr = s->dma_address;
BUG_ON(i > start && s->offset);
if (i == start) {
BUG_ON(s != start && s->offset);
if (s == start) {
*sout = *s;
sout->dma_address = iommu_bus_base;
sout->dma_address += iommu_page*PAGE_SIZE + s->offset;
@ -357,17 +358,17 @@ static int __dma_map_cont(struct scatterlist *sg, int start, int stopat,
return 0;
}
static inline int dma_map_cont(struct scatterlist *sg, int start, int stopat,
static inline int dma_map_cont(struct scatterlist *start, int nelems,
struct scatterlist *sout,
unsigned long pages, int need)
{
if (!need) {
BUG_ON(stopat - start != 1);
*sout = sg[start];
sout->dma_length = sg[start].length;
if (!need) {
BUG_ON(nelems != 1);
*sout = *start;
sout->dma_length = start->length;
return 0;
}
return __dma_map_cont(sg, start, stopat, sout, pages);
}
return __dma_map_cont(start, nelems, sout, pages);
}
/*
@ -381,6 +382,7 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
int start;
unsigned long pages = 0;
int need = 0, nextneed;
struct scatterlist *s, *ps, *start_sg, *sgmap;
if (nents == 0)
return 0;
@ -390,8 +392,9 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
out = 0;
start = 0;
for (i = 0; i < nents; i++) {
struct scatterlist *s = &sg[i];
start_sg = sgmap = sg;
ps = NULL; /* shut up gcc */
for_each_sg(sg, s, nents, i) {
dma_addr_t addr = page_to_phys(s->page) + s->offset;
s->dma_address = addr;
BUG_ON(s->length == 0);
@ -400,29 +403,33 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
/* Handle the previous not yet processed entries */
if (i > start) {
struct scatterlist *ps = &sg[i-1];
/* Can only merge when the last chunk ends on a page
boundary and the new one doesn't have an offset. */
if (!iommu_merge || !nextneed || !need || s->offset ||
(ps->offset + ps->length) % PAGE_SIZE) {
if (dma_map_cont(sg, start, i, sg+out, pages,
need) < 0)
(ps->offset + ps->length) % PAGE_SIZE) {
if (dma_map_cont(start_sg, i - start, sgmap,
pages, need) < 0)
goto error;
out++;
sgmap = sg_next(sgmap);
pages = 0;
start = i;
start = i;
start_sg = s;
}
}
need = nextneed;
pages += to_pages(s->offset, s->length);
ps = s;
}
if (dma_map_cont(sg, start, i, sg+out, pages, need) < 0)
if (dma_map_cont(start_sg, i - start, sgmap, pages, need) < 0)
goto error;
out++;
flush_gart();
if (out < nents)
sg[out].dma_length = 0;
if (out < nents) {
sgmap = sg_next(sgmap);
sgmap->dma_length = 0;
}
return out;
error:
@ -437,8 +444,8 @@ error:
if (panic_on_overflow)
panic("dma_map_sg: overflow on %lu pages\n", pages);
iommu_full(dev, pages << PAGE_SHIFT, dir);
for (i = 0; i < nents; i++)
sg[i].dma_address = bad_dma_address;
for_each_sg(sg, s, nents, i)
s->dma_address = bad_dma_address;
return 0;
}