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path: root/drivers/s390/block/dasd_eckd.c
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Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
-rw-r--r--drivers/s390/block/dasd_eckd.c54
1 files changed, 43 insertions, 11 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index e61a6deea3c0..5adb2042e824 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -85,6 +85,8 @@ MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
static struct ccw_driver dasd_eckd_driver; /* see below */
+static void *rawpadpage;
+
#define INIT_CQR_OK 0
#define INIT_CQR_UNFORMATTED 1
#define INIT_CQR_ERROR 2
@@ -3237,18 +3239,26 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
unsigned int seg_len, len_to_track_end;
unsigned int first_offs;
unsigned int cidaw, cplength, datasize;
- sector_t first_trk, last_trk;
+ sector_t first_trk, last_trk, sectors;
+ sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
unsigned int pfx_datasize;
/*
* raw track access needs to be mutiple of 64k and on 64k boundary
+ * For read requests we can fix an incorrect alignment by padding
+ * the request with dummy pages.
*/
- if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
- cqr = ERR_PTR(-EINVAL);
- goto out;
- }
- if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
- DASD_RAW_SECTORS_PER_TRACK) != 0) {
+ start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
+ end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
+ DASD_RAW_SECTORS_PER_TRACK;
+ end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
+ DASD_RAW_SECTORS_PER_TRACK;
+ basedev = block->base;
+ if ((start_padding_sectors || end_padding_sectors) &&
+ (rq_data_dir(req) == WRITE)) {
+ DBF_DEV_EVENT(DBF_ERR, basedev,
+ "raw write not track aligned (%lu,%lu) req %p",
+ start_padding_sectors, end_padding_sectors, req);
cqr = ERR_PTR(-EINVAL);
goto out;
}
@@ -3258,7 +3268,6 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
DASD_RAW_SECTORS_PER_TRACK;
trkcount = last_trk - first_trk + 1;
first_offs = 0;
- basedev = block->base;
if (rq_data_dir(req) == READ)
cmd = DASD_ECKD_CCW_READ_TRACK;
@@ -3307,12 +3316,26 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
}
idaws = (unsigned long *)(cqr->data + pfx_datasize);
-
len_to_track_end = 0;
-
+ if (start_padding_sectors) {
+ ccw[-1].flags |= CCW_FLAG_CC;
+ ccw->cmd_code = cmd;
+ /* maximum 3390 track size */
+ ccw->count = 57326;
+ /* 64k map to one track */
+ len_to_track_end = 65536 - start_padding_sectors * 512;
+ ccw->cda = (__u32)(addr_t)idaws;
+ ccw->flags |= CCW_FLAG_IDA;
+ ccw->flags |= CCW_FLAG_SLI;
+ ccw++;
+ for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
+ idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
+ }
rq_for_each_segment(bv, req, iter) {
dst = page_address(bv->bv_page) + bv->bv_offset;
seg_len = bv->bv_len;
+ if (cmd == DASD_ECKD_CCW_READ_TRACK)
+ memset(dst, 0, seg_len);
if (!len_to_track_end) {
ccw[-1].flags |= CCW_FLAG_CC;
ccw->cmd_code = cmd;
@@ -3328,7 +3351,8 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
len_to_track_end -= seg_len;
idaws = idal_create_words(idaws, dst, seg_len);
}
-
+ for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
+ idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
if (blk_noretry_request(req) ||
block->base->features & DASD_FEATURE_FAILFAST)
set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
@@ -4479,12 +4503,19 @@ dasd_eckd_init(void)
kfree(dasd_reserve_req);
return -ENOMEM;
}
+ rawpadpage = (void *)__get_free_page(GFP_KERNEL);
+ if (!rawpadpage) {
+ kfree(path_verification_worker);
+ kfree(dasd_reserve_req);
+ return -ENOMEM;
+ }
ret = ccw_driver_register(&dasd_eckd_driver);
if (!ret)
wait_for_device_probe();
else {
kfree(path_verification_worker);
kfree(dasd_reserve_req);
+ free_page((unsigned long)rawpadpage);
}
return ret;
}
@@ -4495,6 +4526,7 @@ dasd_eckd_cleanup(void)
ccw_driver_unregister(&dasd_eckd_driver);
kfree(path_verification_worker);
kfree(dasd_reserve_req);
+ free_page((unsigned long)rawpadpage);
}
module_init(dasd_eckd_init);