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Date: Mon, 16 Jul 2007 11:47:47 +0200
From: Jens Axboe <jens.axboe@...cle.com>
To: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Cc: Jens Axboe <jens.axboe@...cle.com>, bzolnier@...il.com
Subject: [PATCH 33/33] IDE: sg chaining support
Cc: bzolnier@...il.com
Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
drivers/ide/cris/ide-cris.c | 3 ++-
drivers/ide/ide-dma.c | 2 +-
drivers/ide/ide-io.c | 3 ++-
drivers/ide/ide-probe.c | 2 +-
drivers/ide/ide-taskfile.c | 17 +++++++++++++----
drivers/ide/mips/au1xxx-ide.c | 2 +-
drivers/ide/pci/sgiioc4.c | 2 +-
drivers/ide/ppc/pmac.c | 2 +-
include/linux/ide.h | 2 +-
9 files changed, 23 insertions(+), 12 deletions(-)
diff --git a/drivers/ide/cris/ide-cris.c b/drivers/ide/cris/ide-cris.c
index 886091b..e1b2d01 100644
--- a/drivers/ide/cris/ide-cris.c
+++ b/drivers/ide/cris/ide-cris.c
@@ -951,7 +951,8 @@ static int cris_ide_build_dmatable (ide_drive_t *drive)
/* group sequential buffers into one large buffer */
addr = page_to_phys(sg->page) + sg->offset;
size = sg_dma_len(sg);
- while (sg++, --i) {
+ while (--i) {
+ sg = sg_next(sg);
if ((addr + size) != page_to_phys(sg->page) + sg->offset)
break;
size += sg_dma_len(sg);
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index 5fe1d72..a9a18a1 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -294,7 +294,7 @@ int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
}
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index c5b5011..2465c24 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -836,7 +836,8 @@ void ide_init_sg_cmd(ide_drive_t *drive, struct request *rq)
ide_hwif_t *hwif = drive->hwif;
hwif->nsect = hwif->nleft = rq->nr_sectors;
- hwif->cursg = hwif->cursg_ofs = 0;
+ hwif->cursg_ofs = 0;
+ hwif->cursg = NULL;
}
EXPORT_SYMBOL_GPL(ide_init_sg_cmd);
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index cc58013..111ec02 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1352,7 +1352,7 @@ static int hwif_init(ide_hwif_t *hwif)
if (!hwif->sg_max_nents)
hwif->sg_max_nents = PRD_ENTRIES;
- hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
+ hwif->sg_table = kzalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
GFP_KERNEL);
if (!hwif->sg_table) {
printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index aa06daf..3c92790 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -263,6 +263,7 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
+ struct scatterlist *cursg = hwif->cursg;
struct page *page;
#ifdef CONFIG_HIGHMEM
unsigned long flags;
@@ -270,8 +271,14 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
unsigned int offset;
u8 *buf;
- page = sg[hwif->cursg].page;
- offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
+ cursg = hwif->cursg;
+ if (!cursg) {
+ cursg = sg;
+ hwif->cursg = sg;
+ }
+
+ page = cursg->page;
+ offset = cursg->offset + hwif->cursg_ofs * SECTOR_SIZE;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
@@ -285,8 +292,8 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
hwif->nleft--;
hwif->cursg_ofs++;
- if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
- hwif->cursg++;
+ if ((hwif->cursg_ofs * SECTOR_SIZE) == cursg->length) {
+ hwif->cursg = sg_next(hwif->cursg);
hwif->cursg_ofs = 0;
}
@@ -367,6 +374,8 @@ static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
{
+ HWIF(drive)->cursg = NULL;
+
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
ide_task_t *task = rq->special;
diff --git a/drivers/ide/mips/au1xxx-ide.c b/drivers/ide/mips/au1xxx-ide.c
index 2e7013a..48cfb62 100644
--- a/drivers/ide/mips/au1xxx-ide.c
+++ b/drivers/ide/mips/au1xxx-ide.c
@@ -324,7 +324,7 @@ static int auide_build_dmatable(ide_drive_t *drive)
cur_addr += tc;
cur_len -= tc;
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index d396b29..9e36b29 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -531,7 +531,7 @@ sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
}
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index e46f472..9f78c6a 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1648,7 +1648,7 @@ pmac_ide_build_dmatable(ide_drive_t *drive, struct request *rq)
cur_len -= tc;
++table;
}
- sg++;
+ sg = sg_next(sg);
i--;
}
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 19ab258..1e6639e 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -767,7 +767,7 @@ typedef struct hwif_s {
unsigned int nsect;
unsigned int nleft;
- unsigned int cursg;
+ struct scatterlist *cursg;
unsigned int cursg_ofs;
int rqsize; /* max sectors per request */
--
1.5.3.rc0.90.gbaa79
-
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