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iommu sg merging: alpha: make pci_iommu respect the segment size limits 

This patch makes pci_iommu respect segment size limits when merging sg
lists.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2008-02-04 22:27:58 -08:00 committed by Linus Torvalds
parent a031bbcb8d
commit 7c53664dcd
2 changed files with 19 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
arch/alpha/kernel/pci_iommu.c
View File

@ -9,6 +9,7 @@
#include <linux/bootmem.h>
#include <linux/scatterlist.h>
#include <linux/log2.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/hwrpb.h>
@ -470,22 +471,29 @@ EXPORT_SYMBOL(pci_free_consistent);
#define SG_ENT_PHYS_ADDRESS(SG) __pa(SG_ENT_VIRT_ADDRESS(SG))
static void
sg_classify(struct scatterlist *sg, struct scatterlist *end, int virt_ok)
sg_classify(struct device *dev, struct scatterlist *sg, struct scatterlist *end,
int virt_ok)
{
unsigned long next_paddr;
struct scatterlist *leader;
long leader_flag, leader_length;
unsigned int max_seg_size;
leader = sg;
leader_flag = 0;
leader_length = leader->length;
next_paddr = SG_ENT_PHYS_ADDRESS(leader) + leader_length;
/* we will not marge sg without device. */
max_seg_size = dev ? dma_get_max_seg_size(dev) : 0;
for (++sg; sg < end; ++sg) {
unsigned long addr, len;
addr = SG_ENT_PHYS_ADDRESS(sg);
len = sg->length;
if (leader_length + len > max_seg_size)
goto new_segment;
if (next_paddr == addr) {
sg->dma_address = -1;
leader_length += len;
@ -494,6 +502,7 @@ sg_classify(struct scatterlist *sg, struct scatterlist *end, int virt_ok)
leader_flag = 1;
leader_length += len;
} else {
new_segment:
leader->dma_address = leader_flag;
leader->dma_length = leader_length;
leader = sg;
@ -512,7 +521,7 @@ sg_classify(struct scatterlist *sg, struct scatterlist *end, int virt_ok)
in the blanks. */
static int
sg_fill(struct scatterlist *leader, struct scatterlist *end,
sg_fill(struct device *dev, struct scatterlist *leader, struct scatterlist *end,
struct scatterlist *out, struct pci_iommu_arena *arena,
dma_addr_t max_dma, int dac_allowed)
{
@ -562,8 +571,8 @@ sg_fill(struct scatterlist *leader, struct scatterlist *end,
/* Otherwise, break up the remaining virtually contiguous
hunks into individual direct maps and retry. */
sg_classify(leader, end, 0);
return sg_fill(leader, end, out, arena, max_dma, dac_allowed);
sg_classify(dev, leader, end, 0);
return sg_fill(dev, leader, end, out, arena, max_dma, dac_allowed);
}
out->dma_address = arena->dma_base + dma_ofs*PAGE_SIZE + paddr;
@ -619,12 +628,15 @@ pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
struct pci_iommu_arena *arena;
dma_addr_t max_dma;
int dac_allowed;
struct device *dev;
if (direction == PCI_DMA_NONE)
BUG();
dac_allowed = pdev ? pci_dac_dma_supported(pdev, pdev->dma_mask) : 0;
dev = pdev ? &pdev->dev : NULL;
/* Fast path single entry scatterlists. */
if (nents == 1) {
sg->dma_length = sg->length;
@ -638,7 +650,7 @@ pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
end = sg + nents;
/* First, prepare information about the entries. */
sg_classify(sg, end, alpha_mv.mv_pci_tbi != 0);
sg_classify(dev, sg, end, alpha_mv.mv_pci_tbi != 0);
/* Second, figure out where we're going to map things. */
if (alpha_mv.mv_pci_tbi) {
@ -658,7 +670,7 @@ pci_map_sg(struct pci_dev *pdev, struct scatterlist *sg, int nents,
for (out = sg; sg < end; ++sg) {
if ((int) sg->dma_address < 0)
continue;
if (sg_fill(sg, end, out, arena, max_dma, dac_allowed) < 0)
if (sg_fill(dev, sg, end, out, arena, max_dma, dac_allowed) < 0)
goto error;
out++;
}

1
include/asm-alpha/pci.h
View File

@ -4,6 +4,7 @@
#ifdef __KERNEL__
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <asm/scatterlist.h>
#include <asm/machvec.h>