[SCSI] dc395x: convert to use the data buffer accessors
- remove the unnecessary map_single path.
- convert to use the new accessors for the sg lists and the
parameters.
Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jamie Lenehan <lenehan@twibble.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 564ea90..7b8a345 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -979,6 +979,7 @@
static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
struct ScsiReqBlk *srb)
{
+ int nseg;
enum dma_data_direction dir = cmd->sc_data_direction;
dprintkdbg(DBG_0, "build_srb: (pid#%li) <%02i-%i>\n",
cmd->pid, dcb->target_id, dcb->target_lun);
@@ -1000,27 +1001,30 @@
srb->scsi_phase = PH_BUS_FREE; /* initial phase */
srb->end_message = 0;
- if (dir == PCI_DMA_NONE || !cmd->request_buffer) {
+ nseg = scsi_dma_map(cmd);
+ BUG_ON(nseg < 0);
+
+ if (dir == PCI_DMA_NONE || !nseg) {
dprintkdbg(DBG_0,
"build_srb: [0] len=%d buf=%p use_sg=%d !MAP=%08x\n",
- cmd->bufflen, cmd->request_buffer,
- cmd->use_sg, srb->segment_x[0].address);
- } else if (cmd->use_sg) {
+ cmd->bufflen, scsi_sglist(cmd), scsi_sg_count(cmd),
+ srb->segment_x[0].address);
+ } else {
int i;
- u32 reqlen = cmd->request_bufflen;
- struct scatterlist *sl = (struct scatterlist *)
- cmd->request_buffer;
+ u32 reqlen = scsi_bufflen(cmd);
+ struct scatterlist *sg;
struct SGentry *sgp = srb->segment_x;
- srb->sg_count = pci_map_sg(dcb->acb->dev, sl, cmd->use_sg,
- dir);
- dprintkdbg(DBG_0,
- "build_srb: [n] len=%d buf=%p use_sg=%d segs=%d\n",
- reqlen, cmd->request_buffer, cmd->use_sg,
- srb->sg_count);
- for (i = 0; i < srb->sg_count; i++) {
- u32 busaddr = (u32)sg_dma_address(&sl[i]);
- u32 seglen = (u32)sl[i].length;
+ srb->sg_count = nseg;
+
+ dprintkdbg(DBG_0,
+ "build_srb: [n] len=%d buf=%p use_sg=%d segs=%d\n",
+ reqlen, scsi_sglist(cmd), scsi_sg_count(cmd),
+ srb->sg_count);
+
+ scsi_for_each_sg(cmd, sg, srb->sg_count, i) {
+ u32 busaddr = (u32)sg_dma_address(sg);
+ u32 seglen = (u32)sg->length;
sgp[i].address = busaddr;
sgp[i].length = seglen;
srb->total_xfer_length += seglen;
@@ -1050,23 +1054,6 @@
dprintkdbg(DBG_SG, "build_srb: [n] map sg %p->%08x(%05x)\n",
srb->segment_x, srb->sg_bus_addr, SEGMENTX_LEN);
- } else {
- srb->total_xfer_length = cmd->request_bufflen;
- srb->sg_count = 1;
- srb->segment_x[0].address =
- pci_map_single(dcb->acb->dev, cmd->request_buffer,
- srb->total_xfer_length, dir);
-
- /* Fixup for WIDE padding - make sure length is even */
- if (dcb->sync_period & WIDE_SYNC && srb->total_xfer_length % 2)
- srb->total_xfer_length++;
-
- srb->segment_x[0].length = srb->total_xfer_length;
-
- dprintkdbg(DBG_0,
- "build_srb: [1] len=%d buf=%p use_sg=%d map=%08x\n",
- srb->total_xfer_length, cmd->request_buffer,
- cmd->use_sg, srb->segment_x[0].address);
}
srb->request_length = srb->total_xfer_length;
@@ -2128,7 +2115,7 @@
/*clear_fifo(acb, "DOP1"); */
/* KG: What is this supposed to be useful for? WIDE padding stuff? */
if (d_left_counter == 1 && dcb->sync_period & WIDE_SYNC
- && srb->cmd->request_bufflen % 2) {
+ && scsi_bufflen(srb->cmd) % 2) {
d_left_counter = 0;
dprintkl(KERN_INFO,
"data_out_phase0: Discard 1 byte (0x%02x)\n",
@@ -2159,7 +2146,7 @@
sg_update_list(srb, d_left_counter);
/* KG: Most ugly hack! Apparently, this works around a chip bug */
if ((srb->segment_x[srb->sg_index].length ==
- diff && srb->cmd->use_sg)
+ diff && scsi_sg_count(srb->cmd))
|| ((oldxferred & ~PAGE_MASK) ==
(PAGE_SIZE - diff))
) {
@@ -2289,19 +2276,15 @@
unsigned char *virt, *base = NULL;
unsigned long flags = 0;
size_t len = left_io;
+ size_t offset = srb->request_length - left_io;
- if (srb->cmd->use_sg) {
- size_t offset = srb->request_length - left_io;
- local_irq_save(flags);
- /* Assumption: it's inside one page as it's at most 4 bytes and
- I just assume it's on a 4-byte boundary */
- base = scsi_kmap_atomic_sg((struct scatterlist *)srb->cmd->request_buffer,
- srb->sg_count, &offset, &len);
- virt = base + offset;
- } else {
- virt = srb->cmd->request_buffer + srb->cmd->request_bufflen - left_io;
- len = left_io;
- }
+ local_irq_save(flags);
+ /* Assumption: it's inside one page as it's at most 4 bytes and
+ I just assume it's on a 4-byte boundary */
+ base = scsi_kmap_atomic_sg(scsi_sglist(srb->cmd),
+ srb->sg_count, &offset, &len);
+ virt = base + offset;
+
left_io -= len;
while (len) {
@@ -2341,10 +2324,8 @@
DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0);
}
- if (srb->cmd->use_sg) {
- scsi_kunmap_atomic_sg(base);
- local_irq_restore(flags);
- }
+ scsi_kunmap_atomic_sg(base);
+ local_irq_restore(flags);
}
/*printk(" %08x", *(u32*)(bus_to_virt (addr))); */
/*srb->total_xfer_length = 0; */
@@ -2455,7 +2436,7 @@
*/
srb->state |= SRB_DATA_XFER;
DC395x_write32(acb, TRM_S1040_DMA_XHIGHADDR, 0);
- if (srb->cmd->use_sg) { /* with S/G */
+ if (scsi_sg_count(srb->cmd)) { /* with S/G */
io_dir |= DMACMD_SG;
DC395x_write32(acb, TRM_S1040_DMA_XLOWADDR,
srb->sg_bus_addr +
@@ -2513,18 +2494,14 @@
unsigned char *virt, *base = NULL;
unsigned long flags = 0;
size_t len = left_io;
+ size_t offset = srb->request_length - left_io;
- if (srb->cmd->use_sg) {
- size_t offset = srb->request_length - left_io;
- local_irq_save(flags);
- /* Again, max 4 bytes */
- base = scsi_kmap_atomic_sg((struct scatterlist *)srb->cmd->request_buffer,
- srb->sg_count, &offset, &len);
- virt = base + offset;
- } else {
- virt = srb->cmd->request_buffer + srb->cmd->request_bufflen - left_io;
- len = left_io;
- }
+ local_irq_save(flags);
+ /* Again, max 4 bytes */
+ base = scsi_kmap_atomic_sg(scsi_sglist(srb->cmd),
+ srb->sg_count, &offset, &len);
+ virt = base + offset;
+
left_io -= len;
while (len--) {
@@ -2536,10 +2513,8 @@
sg_subtract_one(srb);
}
- if (srb->cmd->use_sg) {
- scsi_kunmap_atomic_sg(base);
- local_irq_restore(flags);
- }
+ scsi_kunmap_atomic_sg(base);
+ local_irq_restore(flags);
}
if (srb->dcb->sync_period & WIDE_SYNC) {
if (ln % 2) {
@@ -3295,7 +3270,8 @@
{
struct scsi_cmnd *cmd = srb->cmd;
enum dma_data_direction dir = cmd->sc_data_direction;
- if (cmd->use_sg && dir != PCI_DMA_NONE) {
+
+ if (scsi_sg_count(cmd) && dir != PCI_DMA_NONE) {
/* unmap DC395x SG list */
dprintkdbg(DBG_SG, "pci_unmap_srb: list=%08x(%05x)\n",
srb->sg_bus_addr, SEGMENTX_LEN);
@@ -3303,16 +3279,9 @@
SEGMENTX_LEN,
PCI_DMA_TODEVICE);
dprintkdbg(DBG_SG, "pci_unmap_srb: segs=%i buffer=%p\n",
- cmd->use_sg, cmd->request_buffer);
+ scsi_sg_count(cmd), scsi_bufflen(cmd));
/* unmap the sg segments */
- pci_unmap_sg(acb->dev,
- (struct scatterlist *)cmd->request_buffer,
- cmd->use_sg, dir);
- } else if (cmd->request_buffer && dir != PCI_DMA_NONE) {
- dprintkdbg(DBG_SG, "pci_unmap_srb: buffer=%08x(%05x)\n",
- srb->segment_x[0].address, cmd->request_bufflen);
- pci_unmap_single(acb->dev, srb->segment_x[0].address,
- cmd->request_bufflen, dir);
+ scsi_dma_unmap(cmd);
}
}
@@ -3352,8 +3321,8 @@
dprintkdbg(DBG_1, "srb_done: (pid#%li) <%02i-%i>\n", srb->cmd->pid,
srb->cmd->device->id, srb->cmd->device->lun);
dprintkdbg(DBG_SG, "srb_done: srb=%p sg=%i(%i/%i) buf=%p\n",
- srb, cmd->use_sg, srb->sg_index, srb->sg_count,
- cmd->request_buffer);
+ srb, scsi_sg_count(cmd), srb->sg_index, srb->sg_count,
+ scsi_sgtalbe(cmd));
status = srb->target_status;
if (srb->flag & AUTO_REQSENSE) {
dprintkdbg(DBG_0, "srb_done: AUTO_REQSENSE1\n");
@@ -3482,16 +3451,10 @@
}
}
- if (dir != PCI_DMA_NONE) {
- if (cmd->use_sg)
- pci_dma_sync_sg_for_cpu(acb->dev,
- (struct scatterlist *)cmd->
- request_buffer, cmd->use_sg, dir);
- else if (cmd->request_buffer)
- pci_dma_sync_single_for_cpu(acb->dev,
- srb->segment_x[0].address,
- cmd->request_bufflen, dir);
- }
+ if (dir != PCI_DMA_NONE && scsi_sg_count(cmd))
+ pci_dma_sync_sg_for_cpu(acb->dev, scsi_sglist(cmd),
+ scsi_sg_count(cmd), dir);
+
ckc_only = 0;
/* Check Error Conditions */
ckc_e:
@@ -3500,19 +3463,15 @@
unsigned char *base = NULL;
struct ScsiInqData *ptr;
unsigned long flags = 0;
+ struct scatterlist* sg = scsi_sglist(cmd);
+ size_t offset = 0, len = sizeof(struct ScsiInqData);
- if (cmd->use_sg) {
- struct scatterlist* sg = (struct scatterlist *)cmd->request_buffer;
- size_t offset = 0, len = sizeof(struct ScsiInqData);
-
- local_irq_save(flags);
- base = scsi_kmap_atomic_sg(sg, cmd->use_sg, &offset, &len);
- ptr = (struct ScsiInqData *)(base + offset);
- } else
- ptr = (struct ScsiInqData *)(cmd->request_buffer);
+ local_irq_save(flags);
+ base = scsi_kmap_atomic_sg(sg, scsi_sg_count(cmd), &offset, &len);
+ ptr = (struct ScsiInqData *)(base + offset);
if (!ckc_only && (cmd->result & RES_DID) == 0
- && cmd->cmnd[2] == 0 && cmd->request_bufflen >= 8
+ && cmd->cmnd[2] == 0 && scsi_bufflen(cmd) >= 8
&& dir != PCI_DMA_NONE && ptr && (ptr->Vers & 0x07) >= 2)
dcb->inquiry7 = ptr->Flags;
@@ -3527,14 +3486,12 @@
}
}
- if (cmd->use_sg) {
- scsi_kunmap_atomic_sg(base);
- local_irq_restore(flags);
- }
+ scsi_kunmap_atomic_sg(base);
+ local_irq_restore(flags);
}
/* Here is the info for Doug Gilbert's sg3 ... */
- cmd->resid = srb->total_xfer_length;
+ scsi_set_resid(cmd, srb->total_xfer_length);
/* This may be interpreted by sb. or not ... */
cmd->SCp.this_residual = srb->total_xfer_length;
cmd->SCp.buffers_residual = 0;
