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-rw-r--r--drivers/s390/block/dasd.c4
-rw-r--r--drivers/s390/block/dasd_eckd.c158
-rw-r--r--drivers/s390/block/dasd_eckd.h6
3 files changed, 122 insertions, 46 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index faa7d425cb9c..605f96f154a5 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -745,10 +745,6 @@ struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
char *data;
int size;
- /* Sanity checks */
- BUG_ON(datasize > PAGE_SIZE ||
- (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
-
size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
if (cplength > 0)
size += cplength * sizeof(struct ccw1);
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index bf61274af3bb..549443af121c 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1105,6 +1105,37 @@ static void dasd_eckd_validate_server(struct dasd_device *device)
"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 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
/* 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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
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 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
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 @@ static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
{
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 @@ static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
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 @@ static struct dasd_discipline dasd_eckd_discipline = {
.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,
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h
index 12097c24f2f5..2150aed541be 100644
--- a/drivers/s390/block/dasd_eckd.h
+++ b/drivers/s390/block/dasd_eckd.h
@@ -57,6 +57,10 @@
*/
#define LV_COMPAT_CYL 0xFFFE
+
+#define FCX_MAX_DATA_FACTOR 65536
+
+
/*****************************************************************************
* SECTION: Type Definitions
****************************************************************************/
@@ -455,6 +459,8 @@ struct dasd_eckd_private {
struct alias_pav_group *pavgroup;
struct alias_lcu *lcu;
int count;
+
+ u32 fcx_max_data;
};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.