The patch titled
iommu sg merging: sparc64: make iommu respect the segment size limits
has been added to the -mm tree. Its filename is
iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: iommu sg merging: sparc64: make iommu respect the segment size limits
From: FUJITA Tomonori <tomof@xxxxxxx>
This patch makes iommu respect segment size limits when merging sg
lists.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Cc: Jeff Garzik <jeff@xxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sparc64/kernel/iommu.c | 2 +-
arch/sparc64/kernel/iommu_common.c | 8 ++++++--
arch/sparc64/kernel/iommu_common.h | 3 ++-
arch/sparc64/kernel/pci_sun4v.c | 2 +-
4 files changed, 10 insertions(+), 5 deletions(-)
diff -puN arch/sparc64/kernel/iommu.c~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits arch/sparc64/kernel/iommu.c
--- a/arch/sparc64/kernel/iommu.c~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits
+++ a/arch/sparc64/kernel/iommu.c
@@ -580,7 +580,7 @@ static int dma_4u_map_sg(struct device *
/* Step 1: Prepare scatter list. */
- npages = prepare_sg(sglist, nelems);
+ npages = prepare_sg(dev, sglist, nelems);
/* Step 2: Allocate a cluster and context, if necessary. */
diff -puN arch/sparc64/kernel/iommu_common.c~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits arch/sparc64/kernel/iommu_common.c
--- a/arch/sparc64/kernel/iommu_common.c~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits
+++ a/arch/sparc64/kernel/iommu_common.c
@@ -4,6 +4,7 @@
* Copyright (C) 1999 David S. Miller (davem@xxxxxxxxxx)
*/
+#include <linux/dma-mapping.h>
#include "iommu_common.h"
/* You are _strongly_ advised to enable the following debugging code
@@ -201,21 +202,24 @@ void verify_sglist(struct scatterlist *s
}
#endif
-unsigned long prepare_sg(struct scatterlist *sg, int nents)
+unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents)
{
struct scatterlist *dma_sg = sg;
unsigned long prev;
u32 dent_addr, dent_len;
+ unsigned int max_seg_size;
prev = (unsigned long) sg_virt(sg);
prev += (unsigned long) (dent_len = sg->length);
dent_addr = (u32) ((unsigned long)(sg_virt(sg)) & (IO_PAGE_SIZE - 1UL));
+ max_seg_size = dma_get_max_seg_size(dev);
while (--nents) {
unsigned long addr;
sg = sg_next(sg);
addr = (unsigned long) sg_virt(sg);
- if (! VCONTIG(prev, addr)) {
+ if (! VCONTIG(prev, addr) ||
+ dent_len + sg->length > max_seg_size) {
dma_sg->dma_address = dent_addr;
dma_sg->dma_length = dent_len;
dma_sg = sg_next(dma_sg);
diff -puN arch/sparc64/kernel/iommu_common.h~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits arch/sparc64/kernel/iommu_common.h
--- a/arch/sparc64/kernel/iommu_common.h~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits
+++ a/arch/sparc64/kernel/iommu_common.h
@@ -9,6 +9,7 @@
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
+#include <linux/device.h>
#include <asm/iommu.h>
#include <asm/scatterlist.h>
@@ -46,4 +47,4 @@ extern void verify_sglist(struct scatter
#define VCONTIG(__X, __Y) (((__X) == (__Y)) || \
(((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
-extern unsigned long prepare_sg(struct scatterlist *sg, int nents);
+extern unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents);
diff -puN arch/sparc64/kernel/pci_sun4v.c~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits arch/sparc64/kernel/pci_sun4v.c
--- a/arch/sparc64/kernel/pci_sun4v.c~iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits
+++ a/arch/sparc64/kernel/pci_sun4v.c
@@ -490,7 +490,7 @@ static int dma_4v_map_sg(struct device *
goto bad;
/* Step 1: Prepare scatter list. */
- npages = prepare_sg(sglist, nelems);
+ npages = prepare_sg(dev, sglist, nelems);
/* Step 2: Allocate a cluster and context, if necessary. */
spin_lock_irqsave(&iommu->lock, flags);
_
Patches currently in -mm which might be from tomof@xxxxxxx are
git-scsi-misc.patch
iommu-sg-merging-add-device_dma_parameters-structure.patch
iommu-sg-merging-pci-add-device_dma_parameters-support.patch
iommu-sg-merging-x86-make-pci-gart-iommu-respect-the-segment-size-limits.patch
iommu-sg-merging-ppc-make-iommu-respect-the-segment-size-limits.patch
iommu-sg-merging-ia64-make-sba_iommu-respect-the-segment-size-limits.patch
iommu-sg-merging-alpha-make-pci_iommu-respect-the-segment-size-limits.patch
iommu-sg-merging-sparc64-make-iommu-respect-the-segment-size-limits.patch
iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits.patch
iommu-sg-merging-call-blk_queue_segment_boundary-in-__scsi_alloc_queue.patch
iommu-sg-merging-sata_inic162x-use-pci_set_dma_max_seg_size.patch
iommu-sg-merging-aacraid-use-pci_set_dma_max_seg_size.patch
-
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