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Date: Wed, 17 Oct 2007 14:07:47 +0900
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To: davem@...emloft.net, linux-kernel@...r.kernel.org
Cc: jens.axboe@...cle.com, linux-scsi@...r.kernel.org
Subject: [PATCH] SPARC64: fix iommu sg chaining
Commit 2c941a204070ab32d92d40318a3196a7fb994c00 looks incomplete. The
helper functions like prepare_sg() need to support sg chaining too.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
arch/sparc64/kernel/iommu.c | 1 -
arch/sparc64/kernel/iommu_common.c | 51 +++++++++++++++++++++---------------
arch/sparc64/kernel/iommu_common.h | 1 +
arch/sparc64/kernel/pci_sun4v.c | 1 -
4 files changed, 31 insertions(+), 23 deletions(-)
diff --git a/arch/sparc64/kernel/iommu.c b/arch/sparc64/kernel/iommu.c
index db3ffcf..5d4e96d 100644
--- a/arch/sparc64/kernel/iommu.c
+++ b/arch/sparc64/kernel/iommu.c
@@ -10,7 +10,6 @@
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
-#include <linux/scatterlist.h>
#ifdef CONFIG_PCI
#include <linux/pci.h>
diff --git a/arch/sparc64/kernel/iommu_common.c b/arch/sparc64/kernel/iommu_common.c
index 12c93a3..d7ca900 100644
--- a/arch/sparc64/kernel/iommu_common.c
+++ b/arch/sparc64/kernel/iommu_common.c
@@ -12,18 +12,22 @@
*/
#ifdef VERIFY_SG
-static int verify_lengths(struct scatterlist *sg, int nents, int npages)
+static int verify_lengths(struct scatterlist *sglist, int nents, int npages)
{
int sg_len, dma_len;
int i, pgcount;
+ struct scatterlist *sg;
sg_len = 0;
- for (i = 0; i < nents; i++)
- sg_len += sg[i].length;
+ for_each_sg(sglist, sg, nents, i)
+ sg_len += sg->length;
dma_len = 0;
- for (i = 0; i < nents && sg[i].dma_length; i++)
- dma_len += sg[i].dma_length;
+ for_each_sg(sglist, sg, nents, i) {
+ if (!sg->dma_length)
+ break;
+ dma_len += sg->dma_length;
+ }
if (sg_len != dma_len) {
printk("verify_lengths: Error, different, sg[%d] dma[%d]\n",
@@ -32,13 +36,16 @@ static int verify_lengths(struct scatterlist *sg, int nents, int npages)
}
pgcount = 0;
- for (i = 0; i < nents && sg[i].dma_length; i++) {
+ for_each_sg(sglist, sg, nents, i) {
unsigned long start, end;
- start = sg[i].dma_address;
+ if (!sg->dma_length)
+ break;
+
+ start = sg->dma_address;
start = start & IO_PAGE_MASK;
- end = sg[i].dma_address + sg[i].dma_length;
+ end = sg->dma_address + sg->dma_length;
end = (end + (IO_PAGE_SIZE - 1)) & IO_PAGE_MASK;
pgcount += ((end - start) >> IO_PAGE_SHIFT);
@@ -113,7 +120,7 @@ static int verify_one_map(struct scatterlist *dma_sg, struct scatterlist **__sg,
if (dlen > 0 && ((daddr & ~IO_PAGE_MASK) == 0))
iopte++;
- sg++;
+ sg = sg_next(sg);
if (--nents <= 0)
break;
sgaddr = (unsigned long) (page_address(sg->page) + sg->offset);
@@ -147,7 +154,7 @@ static int verify_maps(struct scatterlist *sg, int nents, iopte_t *iopte)
nents = verify_one_map(dma_sg, &sg, nents, &iopte);
if (nents <= 0)
break;
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
if (dma_sg->dma_length == 0)
break;
}
@@ -169,22 +176,24 @@ static int verify_maps(struct scatterlist *sg, int nents, iopte_t *iopte)
return 0;
}
-void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages)
+void verify_sglist(struct scatterlist *sglist, int nents, iopte_t *iopte, int npages)
{
- if (verify_lengths(sg, nents, npages) < 0 ||
- verify_maps(sg, nents, iopte) < 0) {
+ struct scatterlist *sg;
+
+ if (verify_lengths(sglist, nents, npages) < 0 ||
+ verify_maps(sglist, nents, iopte) < 0) {
int i;
printk("verify_sglist: Crap, messed up mappings, dumping, iodma at ");
- printk("%016lx.\n", sg->dma_address & IO_PAGE_MASK);
+ printk("%016lx.\n", sglist->dma_address & IO_PAGE_MASK);
- for (i = 0; i < nents; i++) {
+ for_each_sg(sglist, sg, nents, i) {
printk("sg(%d): page_addr(%p) off(%x) length(%x) "
- "dma_address[%016lx] dma_length[%016lx]\n",
+ "dma_address[%016x] dma_length[%016x]\n",
i,
- page_address(sg[i].page), sg[i].offset,
- sg[i].length,
- sg[i].dma_address, sg[i].dma_length);
+ page_address(sg->page), sg->offset,
+ sg->length,
+ sg->dma_address, sg->dma_length);
}
}
@@ -205,12 +214,12 @@ unsigned long prepare_sg(struct scatterlist *sg, int nents)
while (--nents) {
unsigned long addr;
- sg++;
+ sg = sg_next(sg);
addr = (unsigned long) (page_address(sg->page) + sg->offset);
if (! VCONTIG(prev, addr)) {
dma_sg->dma_address = dent_addr;
dma_sg->dma_length = dent_len;
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
dent_addr = ((dent_addr +
dent_len +
diff --git a/arch/sparc64/kernel/iommu_common.h b/arch/sparc64/kernel/iommu_common.h
index ad79101..75b5a58 100644
--- a/arch/sparc64/kernel/iommu_common.h
+++ b/arch/sparc64/kernel/iommu_common.h
@@ -8,6 +8,7 @@
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
+#include <linux/scatterlist.h>
#include <asm/iommu.h>
#include <asm/scatterlist.h>
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index cacacfa..119f8ef 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -13,7 +13,6 @@
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/log2.h>
-#include <linux/scatterlist.h>
#include <asm/iommu.h>
#include <asm/irq.h>
--
1.5.2.4
-
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