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skd: Use a structure instead of hardcoding structure offsets

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This change makes the source code easier to read.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bart Van Assche 2017-08-17 13:13:07 -07:00 committed by Jens Axboe
parent 6507f436f9
commit d891fe6093
1 changed files with 22 additions and 19 deletions
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41
drivers/block/skd_main.c
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@ -181,6 +181,11 @@ enum skd_check_status_action {
SKD_CHECK_STATUS_BUSY_IMMINENT,
};
struct skd_msg_buf {
struct fit_msg_hdr fmh;
struct skd_scsi_request scsi[SKD_MAX_REQ_PER_MSG];
};
struct skd_fitmsg_context {
enum skd_fit_msg_state state;
@ -191,7 +196,7 @@ struct skd_fitmsg_context {
u32 length;
u8 *msg_buf;
struct skd_msg_buf *msg_buf;
dma_addr_t mb_dma_address;
};
@ -231,7 +236,7 @@ struct skd_special_context {
void *data_buf;
dma_addr_t db_dma_address;
u8 *msg_buf;
struct skd_msg_buf *msg_buf;
dma_addr_t mb_dma_address;
};
@ -520,7 +525,6 @@ static void skd_request_fn(struct request_queue *q)
__be64 be_dmaa;
u64 cmdctxt;
u32 timo_slot;
void *cmd_ptr;
int flush, fua;
if (skdev->state != SKD_DRVR_STATE_ONLINE) {
@ -639,7 +643,7 @@ static void skd_request_fn(struct request_queue *q)
skmsg->id += SKD_ID_INCR;
/* Initialize the FIT msg header */
fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
fmh = &skmsg->msg_buf->fmh;
memset(fmh, 0, sizeof(*fmh));
fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
skmsg->length = sizeof(*fmh);
@ -647,13 +651,13 @@ static void skd_request_fn(struct request_queue *q)
skreq->fitmsg_id = skmsg->id;
cmd_ptr = &skmsg->msg_buf[skmsg->length];
memset(cmd_ptr, 0, 32);
scsi_req =
&skmsg->msg_buf->scsi[fmh->num_protocol_cmds_coalesced];
memset(scsi_req, 0, sizeof(*scsi_req));
be_dmaa = cpu_to_be64(skreq->sksg_dma_address);
cmdctxt = skreq->id + SKD_ID_INCR;
scsi_req = cmd_ptr;
scsi_req->hdr.tag = cmdctxt;
scsi_req->hdr.sg_list_dma_address = be_dmaa;
@ -1549,8 +1553,8 @@ static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
struct skd_sg_io *sksgio)
{
struct skd_special_context *skspcl = sksgio->skspcl;
struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
struct fit_msg_hdr *fmh = &skspcl->msg_buf->fmh;
struct skd_scsi_request *scsi_req = &skspcl->msg_buf->scsi[0];
memset(skspcl->msg_buf, 0, SKD_N_SPECIAL_FITMSG_BYTES);
@ -1709,11 +1713,11 @@ static int skd_format_internal_skspcl(struct skd_device *skdev)
uint64_t dma_address;
struct skd_scsi_request *scsi;
fmh = (struct fit_msg_hdr *)&skspcl->msg_buf[0];
fmh = &skspcl->msg_buf->fmh;
fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
fmh->num_protocol_cmds_coalesced = 1;
scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
scsi = &skspcl->msg_buf->scsi[0];
memset(scsi, 0, sizeof(*scsi));
dma_address = skspcl->req.sksg_dma_address;
scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
@ -1748,7 +1752,7 @@ static void skd_send_internal_skspcl(struct skd_device *skdev,
skspcl->req.state = SKD_REQ_STATE_BUSY;
skspcl->req.id += SKD_ID_INCR;
scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
scsi = &skspcl->msg_buf->scsi[0];
scsi->hdr.tag = skspcl->req.id;
memset(scsi->cdb, 0, sizeof(scsi->cdb));
@ -1853,8 +1857,7 @@ static void skd_complete_internal(struct skd_device *skdev,
u8 *buf = skspcl->data_buf;
u8 status;
int i;
struct skd_scsi_request *scsi =
(struct skd_scsi_request *)&skspcl->msg_buf[64];
struct skd_scsi_request *scsi = &skspcl->msg_buf->scsi[0];
lockdep_assert_held(&skdev->lock);
@ -2020,7 +2023,7 @@ static void skd_send_fitmsg(struct skd_device *skdev,
qcmd = skmsg->mb_dma_address;
qcmd |= FIT_QCMD_QID_NORMAL;
fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
fmh = &skmsg->msg_buf->fmh;
skmsg->outstanding = fmh->num_protocol_cmds_coalesced;
if (unlikely(skdev->dbg_level > 1)) {
@ -2501,8 +2504,7 @@ static void skd_process_scsi_inq(struct skd_device *skdev,
struct skd_special_context *skspcl)
{
uint8_t *buf;
struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
struct skd_scsi_request *scsi_req = &skspcl->msg_buf->scsi[0];
dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg,
skspcl->req.sg_data_dir);
@ -4957,8 +4959,9 @@ static void skd_log_skreq(struct skd_device *skdev,
static int __init skd_init(void)
{
BUILD_BUG_ON(sizeof(struct fit_msg_hdr) + SKD_MAX_REQ_PER_MSG *
sizeof(struct skd_scsi_request) != SKD_N_FITMSG_BYTES);
BUILD_BUG_ON(offsetof(struct skd_msg_buf, fmh) != 0);
BUILD_BUG_ON(offsetof(struct skd_msg_buf, scsi) != 64);
BUILD_BUG_ON(sizeof(struct skd_msg_buf) != SKD_N_FITMSG_BYTES);
pr_info(PFX " v%s-b%s loaded\n", DRV_VERSION, DRV_BUILD_ID);