x86-64: update pci-gart iommu to sg helpers
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 4918c57..cfcc84e 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -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_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 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 @@
}
/* 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 @@
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 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 @@
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 @@
/* 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 @@
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;
}
