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[SCSI] ibmvscsi: convert to use the data buffer accessors

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- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Santiago Leon <santil@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
FUJITA Tomonori 2007-05-26 00:32:58 +09:00 committed by James Bottomley
parent a862ea3165
commit 9413d7b8aa
1 changed files with 23 additions and 57 deletions
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76
drivers/scsi/ibmvscsi/ibmvscsi.c
View file

@ -350,20 +350,19 @@ static void unmap_cmd_data(struct srp_cmd *cmd,
}
}
static int map_sg_list(int num_entries,
struct scatterlist *sg,
static int map_sg_list(struct scsi_cmnd *cmd, int nseg,
struct srp_direct_buf *md)
{
int i;
struct scatterlist *sg;
u64 total_length = 0;
for (i = 0; i < num_entries; ++i) {
scsi_for_each_sg(cmd, sg, nseg, i) {
struct srp_direct_buf *descr = md + i;
struct scatterlist *sg_entry = &sg[i];
descr->va = sg_dma_address(sg_entry);
descr->len = sg_dma_len(sg_entry);
descr->va = sg_dma_address(sg);
descr->len = sg_dma_len(sg);
descr->key = 0;
total_length += sg_dma_len(sg_entry);
total_length += sg_dma_len(sg);
}
return total_length;
}
@ -384,24 +383,28 @@ static int map_sg_data(struct scsi_cmnd *cmd,
int sg_mapped;
u64 total_length = 0;
struct scatterlist *sg = cmd->request_buffer;
struct srp_direct_buf *data =
(struct srp_direct_buf *) srp_cmd->add_data;
struct srp_indirect_buf *indirect =
(struct srp_indirect_buf *) data;
sg_mapped = dma_map_sg(dev, sg, cmd->use_sg, DMA_BIDIRECTIONAL);
if (sg_mapped == 0)
sg_mapped = scsi_dma_map(cmd);
if (!sg_mapped)
return 1;
else if (sg_mapped < 0)
return 0;
else if (sg_mapped > SG_ALL) {
printk(KERN_ERR
"ibmvscsi: More than %d mapped sg entries, got %d\n",
SG_ALL, sg_mapped);
return 0;
}
set_srp_direction(cmd, srp_cmd, sg_mapped);
/* special case; we can use a single direct descriptor */
if (sg_mapped == 1) {
data->va = sg_dma_address(&sg[0]);
data->len = sg_dma_len(&sg[0]);
data->key = 0;
map_sg_list(cmd, sg_mapped, data);
return 1;
}
@ -410,7 +413,7 @@ static int map_sg_data(struct scsi_cmnd *cmd,
indirect->table_desc.key = 0;
if (sg_mapped <= MAX_INDIRECT_BUFS) {
total_length = map_sg_list(sg_mapped, sg,
total_length = map_sg_list(cmd, sg_mapped,
&indirect->desc_list[0]);
indirect->len = total_length;
return 1;
@ -429,46 +432,13 @@ static int map_sg_data(struct scsi_cmnd *cmd,
}
}
total_length = map_sg_list(sg_mapped, sg, evt_struct->ext_list);
total_length = map_sg_list(cmd, sg_mapped, evt_struct->ext_list);
indirect->len = total_length;
indirect->table_desc.va = evt_struct->ext_list_token;
indirect->table_desc.len = sg_mapped * sizeof(indirect->desc_list[0]);
memcpy(indirect->desc_list, evt_struct->ext_list,
MAX_INDIRECT_BUFS * sizeof(struct srp_direct_buf));
return 1;
}
/**
* map_single_data: - Maps memory and initializes memory decriptor fields
* @cmd: struct scsi_cmnd with the memory to be mapped
* @srp_cmd: srp_cmd that contains the memory descriptor
* @dev: device for which to map dma memory
*
* Called by map_data_for_srp_cmd() when building srp cmd from scsi cmd.
* Returns 1 on success.
*/
static int map_single_data(struct scsi_cmnd *cmd,
struct srp_cmd *srp_cmd, struct device *dev)
{
struct srp_direct_buf *data =
(struct srp_direct_buf *) srp_cmd->add_data;
data->va =
dma_map_single(dev, cmd->request_buffer,
cmd->request_bufflen,
DMA_BIDIRECTIONAL);
if (dma_mapping_error(data->va)) {
sdev_printk(KERN_ERR, cmd->device,
"Unable to map request_buffer for command!\n");
return 0;
}
data->len = cmd->request_bufflen;
data->key = 0;
set_srp_direction(cmd, srp_cmd, 1);
return 1;
}
@ -502,11 +472,7 @@ static int map_data_for_srp_cmd(struct scsi_cmnd *cmd,
return 0;
}
if (!cmd->request_buffer)
return 1;
if (cmd->use_sg)
return map_sg_data(cmd, evt_struct, srp_cmd, dev);
return map_single_data(cmd, srp_cmd, dev);
}
/**
@ -712,9 +678,9 @@ static void handle_cmd_rsp(struct srp_event_struct *evt_struct)
evt_struct->hostdata->dev);
if (rsp->flags & SRP_RSP_FLAG_DOOVER)
cmnd->resid = rsp->data_out_res_cnt;
scsi_set_resid(cmnd, rsp->data_out_res_cnt);
else if (rsp->flags & SRP_RSP_FLAG_DIOVER)
cmnd->resid = rsp->data_in_res_cnt;
scsi_set_resid(cmnd, rsp->data_in_res_cnt);
}
if (evt_struct->cmnd_done)