diff options
author | Stefan Haberland <stefan.haberland@de.ibm.com> | 2011-01-05 12:48:06 +0100 |
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committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-01-05 12:47:30 +0100 |
commit | e4dbb0f2b5dd6a836d0e5c60aa5f573e0bbcf76a (patch) | |
tree | cb18d0b08f2ccc8d6a078456b77f111805777db8 /drivers/s390/block/dasd_eckd.c | |
parent | 6f272b9cec285a9610a2acf101f694bc58bed37e (diff) |
[S390] dasd: Add support for raw ECKD access.
Normal I/O operations through the DASD device driver give only access
to the data fields of an ECKD device even for track based I/O.
This patch extends the DASD device driver to give access to whole
ECKD tracks including count, key and data fields.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
-rw-r--r-- | drivers/s390/block/dasd_eckd.c | 194 |
1 files changed, 190 insertions, 4 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 46eafce3a0a..318672d0556 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -54,6 +54,15 @@ #define ECKD_F7(i) (i->factor7) #define ECKD_F8(i) (i->factor8) +/* + * raw track access always map to 64k in memory + * so it maps to 16 blocks of 4k per track + */ +#define DASD_RAW_BLOCK_PER_TRACK 16 +#define DASD_RAW_BLOCKSIZE 4096 +/* 64k are 128 x 512 byte sectors */ +#define DASD_RAW_SECTORS_PER_TRACK 128 + MODULE_LICENSE("GPL"); static struct dasd_discipline dasd_eckd_discipline; @@ -385,6 +394,23 @@ static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk, data->length = reclen; data->operation.operation = 0x03; break; + case DASD_ECKD_CCW_WRITE_FULL_TRACK: + data->operation.orientation = 0x0; + data->operation.operation = 0x3F; + data->extended_operation = 0x11; + data->length = 0; + data->extended_parameter_length = 0x02; + if (data->count > 8) { + data->extended_parameter[0] = 0xFF; + data->extended_parameter[1] = 0xFF; + data->extended_parameter[1] <<= (16 - count); + } else { + data->extended_parameter[0] = 0xFF; + data->extended_parameter[0] <<= (8 - count); + data->extended_parameter[1] = 0x00; + } + data->sector = 0xFF; + break; case DASD_ECKD_CCW_WRITE_TRACK_DATA: data->auxiliary.length_valid = 0x1; data->length = reclen; /* not tlf, as one might think */ @@ -408,6 +434,12 @@ static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk, case DASD_ECKD_CCW_READ_COUNT: data->operation.operation = 0x06; break; + case DASD_ECKD_CCW_READ_TRACK: + data->operation.orientation = 0x1; + data->operation.operation = 0x0C; + data->extended_parameter_length = 0; + data->sector = 0xFF; + break; case DASD_ECKD_CCW_READ_TRACK_DATA: data->auxiliary.length_valid = 0x1; data->length = tlf; @@ -451,10 +483,16 @@ static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, ccw->cmd_code = DASD_ECKD_CCW_PFX; ccw->flags = 0; - ccw->count = sizeof(*pfxdata); - ccw->cda = (__u32) __pa(pfxdata); + if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) { + ccw->count = sizeof(*pfxdata) + 2; + ccw->cda = (__u32) __pa(pfxdata); + memset(pfxdata, 0, sizeof(*pfxdata) + 2); + } else { + ccw->count = sizeof(*pfxdata); + ccw->cda = (__u32) __pa(pfxdata); + memset(pfxdata, 0, sizeof(*pfxdata)); + } - memset(pfxdata, 0, sizeof(*pfxdata)); /* prefix data */ if (format > 1) { DBF_DEV_EVENT(DBF_ERR, basedev, @@ -488,6 +526,7 @@ static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, dedata->mask.perm = 0x1; dedata->attributes.operation = basepriv->attrib.operation; break; + case DASD_ECKD_CCW_READ_TRACK: case DASD_ECKD_CCW_READ_TRACK_DATA: dedata->mask.perm = 0x1; dedata->attributes.operation = basepriv->attrib.operation; @@ -514,6 +553,11 @@ static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, dedata->attributes.operation = DASD_BYPASS_CACHE; rc = check_XRC_on_prefix(pfxdata, basedev); break; + case DASD_ECKD_CCW_WRITE_FULL_TRACK: + dedata->mask.perm = 0x03; + dedata->attributes.operation = basepriv->attrib.operation; + dedata->blk_size = 0; + break; case DASD_ECKD_CCW_WRITE_TRACK_DATA: dedata->mask.perm = 0x02; dedata->attributes.operation = basepriv->attrib.operation; @@ -1607,6 +1651,13 @@ static int dasd_eckd_end_analysis(struct dasd_block *block) dasd_sfree_request(init_cqr, device); } + if (device->features & DASD_FEATURE_USERAW) { + block->bp_block = DASD_RAW_BLOCKSIZE; + blk_per_trk = DASD_RAW_BLOCK_PER_TRACK; + block->s2b_shift = 3; + goto raw; + } + if (status == INIT_CQR_UNFORMATTED) { dev_warn(&device->cdev->dev, "The DASD is not formatted\n"); return -EMEDIUMTYPE; @@ -1644,6 +1695,7 @@ static int dasd_eckd_end_analysis(struct dasd_block *block) dev_warn(&device->cdev->dev, "Track 0 has no records following the VTOC\n"); } + if (count_area != NULL && count_area->kl == 0) { /* we found notthing violating our disk layout */ if (dasd_check_blocksize(count_area->dl) == 0) @@ -1659,6 +1711,8 @@ static int dasd_eckd_end_analysis(struct dasd_block *block) block->s2b_shift++; blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block); + +raw: block->blocks = (private->real_cyl * private->rdc_data.trk_per_cyl * blk_per_trk); @@ -2741,6 +2795,135 @@ static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev, return cqr; } +static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev, + struct dasd_block *block, + struct request *req) +{ + struct dasd_eckd_private *private; + unsigned long *idaws; + struct dasd_device *basedev; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + struct req_iterator iter; + struct bio_vec *bv; + char *dst; + unsigned char cmd; + unsigned int trkcount; + unsigned int seg_len, len_to_track_end; + unsigned int first_offs; + unsigned int cidaw, cplength, datasize; + sector_t first_trk, last_trk; + unsigned int pfx_datasize; + + /* + * raw track access needs to be mutiple of 64k and on 64k boundary + */ + 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) { + cqr = ERR_PTR(-EINVAL); + goto out; + } + + first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK; + last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) / + DASD_RAW_SECTORS_PER_TRACK; + trkcount = last_trk - first_trk + 1; + first_offs = 0; + basedev = block->base; + private = (struct dasd_eckd_private *) basedev->private; + + if (rq_data_dir(req) == READ) + cmd = DASD_ECKD_CCW_READ_TRACK; + else if (rq_data_dir(req) == WRITE) + cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK; + else { + cqr = ERR_PTR(-EINVAL); + goto out; + } + + /* + * Raw track based I/O needs IDAWs for each page, + * and not just for 64 bit addresses. + */ + cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK; + + /* 1x prefix + one read/write ccw per track */ + cplength = 1 + trkcount; + + /* + * struct PFX_eckd_data has up to 2 byte as extended parameter + * this is needed for write full track and has to be mentioned + * seperately + * add 8 instead of 2 to keep 8 byte boundary + */ + pfx_datasize = sizeof(struct PFX_eckd_data) + 8; + + datasize = pfx_datasize + cidaw * sizeof(unsigned long long); + + /* Allocate the ccw request. */ + cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, + datasize, startdev); + if (IS_ERR(cqr)) + goto out; + ccw = cqr->cpaddr; + + if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd, + basedev, startdev, 1 /* format */, first_offs + 1, + trkcount, 0, 0) == -EAGAIN) { + /* Clock not in sync and XRC is enabled. + * Try again later. + */ + dasd_sfree_request(cqr, startdev); + cqr = ERR_PTR(-EAGAIN); + goto out; + } + + idaws = (unsigned long *)(cqr->data + pfx_datasize); + + len_to_track_end = 0; + + rq_for_each_segment(bv, req, iter) { + dst = page_address(bv->bv_page) + bv->bv_offset; + seg_len = bv->bv_len; + if (!len_to_track_end) { + 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; + ccw->cda = (__u32)(addr_t)idaws; + ccw->flags |= CCW_FLAG_IDA; + ccw->flags |= CCW_FLAG_SLI; + ccw++; + } + len_to_track_end -= seg_len; + idaws = idal_create_words(idaws, dst, seg_len); + } + + if (blk_noretry_request(req) || + block->base->features & DASD_FEATURE_FAILFAST) + set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); + cqr->startdev = startdev; + cqr->memdev = startdev; + cqr->block = block; + cqr->expires = startdev->default_expires * HZ; + cqr->lpm = startdev->path_data.ppm; + cqr->retries = 256; + cqr->buildclk = get_clock(); + cqr->status = DASD_CQR_FILLED; + + if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN) + cqr = NULL; +out: + return cqr; +} + + static int dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req) { @@ -2845,7 +3028,10 @@ static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base, spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags); private->count++; - cqr = dasd_eckd_build_cp(startdev, block, req); + if ((base->features & DASD_FEATURE_USERAW)) + cqr = dasd_raw_build_cp(startdev, block, req); + else + cqr = dasd_eckd_build_cp(startdev, block, req); if (IS_ERR(cqr)) private->count--; spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags); 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