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Commit a862ea31 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by James Bottomley
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[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: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Jamie Lenehan <lenehan@twibble.org>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 69eca4f5
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Showing with 60 additions and 103 deletions
drivers/scsi/dc395x.c
View file @ a862ea31
......@@ -979,6 +979,7 @@ static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
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 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
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);
srb->sg_count = nseg;
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);
"build_srb: [n] len=%d buf=%p use_sg=%d segs=%d\n",
reqlen, scsi_sglist(cmd), scsi_sg_count(cmd),
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;
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 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
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 @@ static void data_out_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
/*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 @@ static void data_out_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
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 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
unsigned char *virt, *base = NULL;
unsigned long flags = 0;
size_t len = left_io;
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(scsi_sglist(srb->cmd),
srb->sg_count, &offset, &len);
virt = base + offset;
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;
}
left_io -= len;
while (len) {
......@@ -2341,10 +2324,8 @@ static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
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 @@ static void data_io_transfer(struct AdapterCtlBlk *acb,
*/
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 @@ static void data_io_transfer(struct AdapterCtlBlk *acb,
unsigned char *virt, *base = NULL;
unsigned long flags = 0;
size_t len = left_io;
size_t offset = srb->request_length - 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;
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;
}
left_io -= len;
while (len--) {
......@@ -2536,10 +2513,8 @@ static void data_io_transfer(struct AdapterCtlBlk *acb,
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 @@ static void pci_unmap_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
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 @@ static void pci_unmap_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
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 @@ static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
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 @@ static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
}
}
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 @@ static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
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 @@ static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
}
}
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;
......
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