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Date: Mon, 16 Jul 2007 11:47:35 +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>, hch@...radead.org
Subject: [PATCH 21/33] qla1280: sg chaining support
Interesting hardware setup...
Cc: hch@...radead.org
Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
drivers/scsi/qla1280.c | 66 +++++++++++++++++++++++++++---------------------
1 files changed, 37 insertions(+), 29 deletions(-)
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 54d8bdf..bd805ec 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2775,7 +2775,7 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
struct device_reg __iomem *reg = ha->iobase;
struct scsi_cmnd *cmd = sp->cmd;
cmd_a64_entry_t *pkt;
- struct scatterlist *sg = NULL;
+ struct scatterlist *sg = NULL, *s;
__le32 *dword_ptr;
dma_addr_t dma_handle;
int status = 0;
@@ -2889,13 +2889,16 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
* Load data segments.
*/
if (seg_cnt) { /* If data transfer. */
+ int remseg = seg_cnt;
/* Setup packet address segment pointer. */
dword_ptr = (u32 *)&pkt->dseg_0_address;
if (cmd->use_sg) { /* If scatter gather */
/* Load command entry data segments. */
- for (cnt = 0; cnt < 2 && seg_cnt; cnt++, seg_cnt--) {
- dma_handle = sg_dma_address(sg);
+ for_each_sg(sg, s, seg_cnt, cnt) {
+ if (cnt == 2)
+ break;
+ dma_handle = sg_dma_address(s);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
if (ha->flags.use_pci_vchannel)
sn_pci_set_vchan(ha->pdev,
@@ -2906,12 +2909,12 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
cpu_to_le32(pci_dma_lo32(dma_handle));
*dword_ptr++ =
cpu_to_le32(pci_dma_hi32(dma_handle));
- *dword_ptr++ = cpu_to_le32(sg_dma_len(sg));
- sg++;
+ *dword_ptr++ = cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
cpu_to_le32(pci_dma_hi32(dma_handle)),
cpu_to_le32(pci_dma_lo32(dma_handle)),
- cpu_to_le32(sg_dma_len(sg)));
+ cpu_to_le32(sg_dma_len(sg_next(s))));
+ remseg--;
}
dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
"command packet data - b %i, t %i, l %i \n",
@@ -2926,7 +2929,9 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
"remains\n", seg_cnt);
- while (seg_cnt > 0) {
+ while (remseg > 0) {
+ /* Update sg start */
+ sg = s;
/* Adjust ring index. */
ha->req_ring_index++;
if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
@@ -2952,9 +2957,10 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
(u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;
/* Load continuation entry data segments. */
- for (cnt = 0; cnt < 5 && seg_cnt;
- cnt++, seg_cnt--) {
- dma_handle = sg_dma_address(sg);
+ for_each_sg(sg, s, remseg, cnt) {
+ if (cnt == 5)
+ break;
+ dma_handle = sg_dma_address(s);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
if (ha->flags.use_pci_vchannel)
sn_pci_set_vchan(ha->pdev,
@@ -2966,12 +2972,12 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
*dword_ptr++ =
cpu_to_le32(pci_dma_hi32(dma_handle));
*dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
cpu_to_le32(pci_dma_hi32(dma_handle)),
cpu_to_le32(pci_dma_lo32(dma_handle)),
- cpu_to_le32(sg_dma_len(sg)));
- sg++;
+ cpu_to_le32(sg_dma_len(s)));
+ remseg--;
}
dprintk(5, "qla1280_64bit_start_scsi: "
"continuation packet data - b %i, t "
@@ -3062,7 +3068,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
struct device_reg __iomem *reg = ha->iobase;
struct scsi_cmnd *cmd = sp->cmd;
struct cmd_entry *pkt;
- struct scatterlist *sg = NULL;
+ struct scatterlist *sg = NULL, *s;
__le32 *dword_ptr;
int status = 0;
int cnt;
@@ -3188,6 +3194,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
* Load data segments.
*/
if (seg_cnt) {
+ int remseg = seg_cnt;
/* Setup packet address segment pointer. */
dword_ptr = &pkt->dseg_0_address;
@@ -3196,22 +3203,25 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
qla1280_dump_buffer(1, (char *)sg, 4 * 16);
/* Load command entry data segments. */
- for (cnt = 0; cnt < 4 && seg_cnt; cnt++, seg_cnt--) {
+ for_each_sg(sg, s, seg_cnt, cnt) {
+ if (cnt == 4)
+ break;
*dword_ptr++ =
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
- *dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
+ *dword_ptr++ = cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
- (pci_dma_lo32(sg_dma_address(sg))),
- (sg_dma_len(sg)));
- sg++;
+ (pci_dma_lo32(sg_dma_address(s))),
+ (sg_dma_len(s)));
+ remseg--;
}
/*
* Build continuation packets.
*/
dprintk(3, "S/G Building Continuation"
"...seg_cnt=0x%x remains\n", seg_cnt);
- while (seg_cnt > 0) {
+ while (remseg > 0) {
+ /* Continue from end point */
+ sg = s;
/* Adjust ring index. */
ha->req_ring_index++;
if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
@@ -3239,18 +3249,16 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
&((struct cont_entry *) pkt)->dseg_0_address;
/* Load continuation entry data segments. */
- for (cnt = 0; cnt < 7 && seg_cnt;
- cnt++, seg_cnt--) {
+ for_each_sg(sg, s, remseg, cnt) {
*dword_ptr++ =
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
*dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(sg_dma_len(s));
dprintk(1,
"S/G Segment Cont. phys_addr=0x%x, "
"len=0x%x\n",
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg))),
- cpu_to_le32(sg_dma_len(sg)));
- sg++;
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s))),
+ cpu_to_le32(sg_dma_len(s)));
}
dprintk(5, "qla1280_32bit_start_scsi: "
"continuation packet data - "
--
1.5.3.rc0.90.gbaa79
-
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