[S390] dasd: add High Performance FICON multitrack support
Some storage systems support multitrack High Performance FICON
requests, which read or write data to more than one track.
This patch enables the DASD device driver to generate multitrack
High Performance FICON requests.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index bf61274a..549443a 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1105,6 +1105,37 @@
"returned rc=%d", private->uid.ssid, rc);
}
+static u32 get_fcx_max_data(struct dasd_device *device)
+{
+#if defined(CONFIG_64BIT)
+ int tpm, mdc;
+ int fcx_in_css, fcx_in_gneq, fcx_in_features;
+ struct dasd_eckd_private *private;
+
+ if (dasd_nofcx)
+ return 0;
+ /* is transport mode supported? */
+ private = (struct dasd_eckd_private *) device->private;
+ fcx_in_css = css_general_characteristics.fcx;
+ fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
+ fcx_in_features = private->features.feature[40] & 0x80;
+ tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
+
+ if (!tpm)
+ return 0;
+
+ mdc = ccw_device_get_mdc(device->cdev, 0);
+ if (mdc < 0) {
+ dev_warn(&device->cdev->dev, "Detecting the maximum supported"
+ " data size for zHPF requests failed\n");
+ return 0;
+ } else
+ return mdc * FCX_MAX_DATA_FACTOR;
+#else
+ return 0;
+#endif
+}
+
/*
* Check device characteristics.
* If the device is accessible using ECKD discipline, the device is enabled.
@@ -1223,6 +1254,8 @@
else
private->real_cyl = private->rdc_data.no_cyl;
+ private->fcx_max_data = get_fcx_max_data(device);
+
readonly = dasd_device_is_ro(device);
if (readonly)
set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
@@ -2326,6 +2359,12 @@
struct tidaw *last_tidaw = NULL;
int itcw_op;
size_t itcw_size;
+ u8 tidaw_flags;
+ unsigned int seg_len, part_len, len_to_track_end;
+ unsigned char new_track;
+ sector_t recid, trkid;
+ unsigned int offs;
+ unsigned int count, count_to_trk_end;
basedev = block->base;
private = (struct dasd_eckd_private *) basedev->private;
@@ -2341,12 +2380,16 @@
/* trackbased I/O needs address all memory via TIDAWs,
* not just for 64 bit addresses. This allows us to map
* each segment directly to one tidaw.
+ * In the case of write requests, additional tidaws may
+ * be needed when a segment crosses a track boundary.
*/
trkcount = last_trk - first_trk + 1;
ctidaw = 0;
rq_for_each_segment(bv, req, iter) {
++ctidaw;
}
+ if (rq_data_dir(req) == WRITE)
+ ctidaw += (last_trk - first_trk);
/* Allocate the ccw request. */
itcw_size = itcw_calc_size(0, ctidaw, 0);
@@ -2354,15 +2397,6 @@
if (IS_ERR(cqr))
return cqr;
- cqr->cpmode = 1;
- cqr->startdev = startdev;
- cqr->memdev = startdev;
- cqr->block = block;
- cqr->expires = 100*HZ;
- cqr->buildclk = get_clock();
- cqr->status = DASD_CQR_FILLED;
- cqr->retries = 10;
-
/* transfer length factor: how many bytes to read from the last track */
if (first_trk == last_trk)
tlf = last_offs - first_offs + 1;
@@ -2371,8 +2405,11 @@
tlf *= blksize;
itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
+ if (IS_ERR(itcw)) {
+ dasd_sfree_request(cqr, startdev);
+ return ERR_PTR(-EINVAL);
+ }
cqr->cpaddr = itcw_get_tcw(itcw);
-
if (prepare_itcw(itcw, first_trk, last_trk,
cmd, basedev, startdev,
first_offs + 1,
@@ -2385,26 +2422,64 @@
dasd_sfree_request(cqr, startdev);
return ERR_PTR(-EAGAIN);
}
-
/*
* A tidaw can address 4k of memory, but must not cross page boundaries
* We can let the block layer handle this by setting
* blk_queue_segment_boundary to page boundaries and
* blk_max_segment_size to page size when setting up the request queue.
+ * For write requests, a TIDAW must not cross track boundaries, because
+ * we have to set the CBC flag on the last tidaw for each track.
*/
- rq_for_each_segment(bv, req, iter) {
- dst = page_address(bv->bv_page) + bv->bv_offset;
- last_tidaw = itcw_add_tidaw(itcw, 0x00, dst, bv->bv_len);
- if (IS_ERR(last_tidaw))
- return (struct dasd_ccw_req *)last_tidaw;
+ if (rq_data_dir(req) == WRITE) {
+ new_track = 1;
+ recid = first_rec;
+ rq_for_each_segment(bv, req, iter) {
+ dst = page_address(bv->bv_page) + bv->bv_offset;
+ seg_len = bv->bv_len;
+ while (seg_len) {
+ if (new_track) {
+ trkid = recid;
+ offs = sector_div(trkid, blk_per_trk);
+ count_to_trk_end = blk_per_trk - offs;
+ count = min((last_rec - recid + 1),
+ (sector_t)count_to_trk_end);
+ len_to_track_end = count * blksize;
+ recid += count;
+ new_track = 0;
+ }
+ part_len = min(seg_len, len_to_track_end);
+ seg_len -= part_len;
+ len_to_track_end -= part_len;
+ /* We need to end the tidaw at track end */
+ if (!len_to_track_end) {
+ new_track = 1;
+ tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
+ } else
+ tidaw_flags = 0;
+ last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
+ dst, part_len);
+ if (IS_ERR(last_tidaw))
+ return ERR_PTR(-EINVAL);
+ dst += part_len;
+ }
+ }
+ } else {
+ rq_for_each_segment(bv, req, iter) {
+ dst = page_address(bv->bv_page) + bv->bv_offset;
+ last_tidaw = itcw_add_tidaw(itcw, 0x00,
+ dst, bv->bv_len);
+ if (IS_ERR(last_tidaw))
+ return ERR_PTR(-EINVAL);
+ }
}
-
- last_tidaw->flags |= 0x80;
+ last_tidaw->flags |= TIDAW_FLAGS_LAST;
+ last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
itcw_finalize(itcw);
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
+ cqr->cpmode = 1;
cqr->startdev = startdev;
cqr->memdev = startdev;
cqr->block = block;
@@ -2420,11 +2495,9 @@
struct dasd_block *block,
struct request *req)
{
- int tpm, cmdrtd, cmdwtd;
+ int cmdrtd, cmdwtd;
int use_prefix;
-#if defined(CONFIG_64BIT)
- int fcx_in_css, fcx_in_gneq, fcx_in_features;
-#endif
+ int fcx_multitrack;
struct dasd_eckd_private *private;
struct dasd_device *basedev;
sector_t first_rec, last_rec;
@@ -2432,6 +2505,7 @@
unsigned int first_offs, last_offs;
unsigned int blk_per_trk, blksize;
int cdlspecial;
+ unsigned int data_size;
struct dasd_ccw_req *cqr;
basedev = block->base;
@@ -2450,15 +2524,11 @@
last_offs = sector_div(last_trk, blk_per_trk);
cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
- /* is transport mode supported? */
-#if defined(CONFIG_64BIT)
- fcx_in_css = css_general_characteristics.fcx;
- fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
- fcx_in_features = private->features.feature[40] & 0x80;
- tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
-#else
- tpm = 0;
-#endif
+ fcx_multitrack = private->features.feature[40] & 0x20;
+ data_size = blk_rq_bytes(req);
+ /* tpm write request add CBC data on each track boundary */
+ if (rq_data_dir(req) == WRITE)
+ data_size += (last_trk - first_trk) * 4;
/* is read track data and write track data in command mode supported? */
cmdrtd = private->features.feature[9] & 0x20;
@@ -2468,13 +2538,15 @@
cqr = NULL;
if (cdlspecial || dasd_page_cache) {
/* do nothing, just fall through to the cmd mode single case */
- } else if (!dasd_nofcx && tpm && (first_trk == last_trk)) {
+ } else if ((data_size <= private->fcx_max_data)
+ && (fcx_multitrack || (first_trk == last_trk))) {
cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
first_rec, last_rec,
first_trk, last_trk,
first_offs, last_offs,
blk_per_trk, blksize);
- if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
+ if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
+ (PTR_ERR(cqr) != -ENOMEM))
cqr = NULL;
} else if (use_prefix &&
(((rq_data_dir(req) == READ) && cmdrtd) ||
@@ -2484,7 +2556,8 @@
first_trk, last_trk,
first_offs, last_offs,
blk_per_trk, blksize);
- if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
+ if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
+ (PTR_ERR(cqr) != -ENOMEM))
cqr = NULL;
}
if (!cqr)
@@ -3279,10 +3352,8 @@
{
char *page;
int len, sl, sct, residual;
-
struct tsb *tsb;
- u8 *sense;
-
+ u8 *sense, *rcq;
page = (char *) get_zeroed_page(GFP_ATOMIC);
if (page == NULL) {
@@ -3348,12 +3419,15 @@
case 2: /* ts_ddpc */
len += sprintf(page + len, KERN_ERR PRINTK_HEADER
" tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
- len += sprintf(page + len, KERN_ERR PRINTK_HEADER
- " tsb->tsa.ddpc.rcq: ");
- for (sl = 0; sl < 16; sl++) {
+ for (sl = 0; sl < 2; sl++) {
+ len += sprintf(page + len,
+ KERN_ERR PRINTK_HEADER
+ " tsb->tsa.ddpc.rcq %2d-%2d: ",
+ (8 * sl), ((8 * sl) + 7));
+ rcq = tsb->tsa.ddpc.rcq;
for (sct = 0; sct < 8; sct++) {
len += sprintf(page + len, " %02x",
- tsb->tsa.ddpc.rcq[sl]);
+ rcq[8 * sl + sct]);
}
len += sprintf(page + len, "\n");
}
@@ -3573,7 +3647,7 @@
.owner = THIS_MODULE,
.name = "ECKD",
.ebcname = "ECKD",
- .max_blocks = 240,
+ .max_blocks = 190,
.check_device = dasd_eckd_check_characteristics,
.uncheck_device = dasd_eckd_uncheck_device,
.do_analysis = dasd_eckd_do_analysis,