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author | Jan Höppner <hoeppner@linux.vnet.ibm.com> | 2017-03-14 11:10:16 +0100 |
---|---|---|
committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-07-05 07:35:28 +0200 |
commit | 45f186becfcfa12a98acdfa2af513018d8b086e0 (patch) | |
tree | 8fe253f470ce2275f4214843c63550edb573e1aa /drivers | |
parent | s390: fix up for "blk-mq: switch ->queue_rq return value to blk_status_t" (diff) | |
download | linux-45f186becfcfa12a98acdfa2af513018d8b086e0.tar.xz linux-45f186becfcfa12a98acdfa2af513018d8b086e0.zip |
s390/dasd: Refactor prefix_LRE() and related functions
We already have define_extent() that prepares necessary data for the
Define Extent CCW. The exact same thing is done in prefix_LRE().
Remove the duplicate code and move commands that were only used in
combination with the Prefix command to define_extent(). One of these
commands needs the blocksize to be specified. Add the blksize parameter
to define_extent() to account for that.
In addition, the check_XRC() function can be made more generic. Do this
and remove the Prefix-specific check_XRC_on_prefix() function.
Furthermore, prefix_LRE() uses fill_LRE_data() to prepare Locate Record
Extended data. Rename the function to fit the scheme better and make it
usable outside of the Prefix context by adding the corresponding CCW
command.
Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to '')
-rw-r--r-- | drivers/s390/block/dasd_eckd.c | 217 | ||||
-rw-r--r-- | drivers/s390/block/dasd_eckd.h | 1 |
2 files changed, 78 insertions, 140 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 122456e4db89..4fdf1101bd2f 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -213,10 +213,8 @@ static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head) geo->head |= head; } -static int -check_XRC (struct ccw1 *de_ccw, - struct DE_eckd_data *data, - struct dasd_device *device) +static int check_XRC(struct ccw1 *ccw, struct DE_eckd_data *data, + struct dasd_device *device) { struct dasd_eckd_private *private = device->private; int rc; @@ -224,7 +222,7 @@ check_XRC (struct ccw1 *de_ccw, if (!private->rdc_data.facilities.XRC_supported) return 0; - /* switch on System Time Stamp - needed for XRC Support */ + /* switch on System Time Stamp - needed for XRC Support */ data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */ data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */ @@ -233,24 +231,30 @@ check_XRC (struct ccw1 *de_ccw, if (rc == -EOPNOTSUPP || rc == -EACCES) rc = 0; - de_ccw->count = sizeof(struct DE_eckd_data); - de_ccw->flags |= CCW_FLAG_SLI; + if (ccw) { + ccw->count = sizeof(struct DE_eckd_data); + ccw->flags |= CCW_FLAG_SLI; + } + return rc; } static int define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk, - unsigned int totrk, int cmd, struct dasd_device *device) + unsigned int totrk, int cmd, struct dasd_device *device, + int blksize) { struct dasd_eckd_private *private = device->private; - u32 begcyl, endcyl; u16 heads, beghead, endhead; + u32 begcyl, endcyl; int rc = 0; - ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT; - ccw->flags = 0; - ccw->count = 16; - ccw->cda = (__u32) __pa(data); + if (ccw) { + ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT; + ccw->flags = 0; + ccw->count = 16; + ccw->cda = (__u32)__pa(data); + } memset(data, 0, sizeof(struct DE_eckd_data)); switch (cmd) { @@ -269,18 +273,24 @@ define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk, data->mask.perm = 0x1; data->attributes.operation = DASD_BYPASS_CACHE; break; + case DASD_ECKD_CCW_READ_TRACK: + case DASD_ECKD_CCW_READ_TRACK_DATA: + data->mask.perm = 0x1; + data->attributes.operation = private->attrib.operation; + data->blk_size = 0; + break; case DASD_ECKD_CCW_WRITE: case DASD_ECKD_CCW_WRITE_MT: case DASD_ECKD_CCW_WRITE_KD: case DASD_ECKD_CCW_WRITE_KD_MT: data->mask.perm = 0x02; data->attributes.operation = private->attrib.operation; - rc = check_XRC (ccw, data, device); + rc = check_XRC(ccw, data, device); break; case DASD_ECKD_CCW_WRITE_CKD: case DASD_ECKD_CCW_WRITE_CKD_MT: data->attributes.operation = DASD_BYPASS_CACHE; - rc = check_XRC (ccw, data, device); + rc = check_XRC(ccw, data, device); break; case DASD_ECKD_CCW_ERASE: case DASD_ECKD_CCW_WRITE_HOME_ADDRESS: @@ -288,7 +298,18 @@ define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk, data->mask.perm = 0x3; data->mask.auth = 0x1; data->attributes.operation = DASD_BYPASS_CACHE; - rc = check_XRC (ccw, data, device); + rc = check_XRC(ccw, data, device); + break; + case DASD_ECKD_CCW_WRITE_FULL_TRACK: + data->mask.perm = 0x03; + data->attributes.operation = private->attrib.operation; + data->blk_size = 0; + break; + case DASD_ECKD_CCW_WRITE_TRACK_DATA: + data->mask.perm = 0x02; + data->attributes.operation = private->attrib.operation; + data->blk_size = blksize; + rc = check_XRC(ccw, data, device); break; default: dev_err(&device->cdev->dev, @@ -325,36 +346,26 @@ define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk, return rc; } -static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata, - struct dasd_device *device) -{ - struct dasd_eckd_private *private = device->private; - int rc; - if (!private->rdc_data.facilities.XRC_supported) - return 0; - - /* switch on System Time Stamp - needed for XRC Support */ - pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid' */ - pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */ - pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */ - - rc = get_phys_clock(&pfxdata->define_extent.ep_sys_time); - /* Ignore return code if sync clock is switched off. */ - if (rc == -EOPNOTSUPP || rc == -EACCES) - rc = 0; - return rc; -} - -static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk, - unsigned int rec_on_trk, int count, int cmd, - struct dasd_device *device, unsigned int reclen, - unsigned int tlf) +static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data, + unsigned int trk, unsigned int rec_on_trk, + int count, int cmd, struct dasd_device *device, + unsigned int reclen, unsigned int tlf) { struct dasd_eckd_private *private = device->private; int sector; int dn, d; + if (ccw) { + ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT; + ccw->flags = 0; + if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) + ccw->count = 22; + else + ccw->count = 20; + ccw->cda = (__u32)__pa(data); + } + memset(data, 0, sizeof(*data)); sector = 0; if (rec_on_trk) { @@ -481,14 +492,12 @@ static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk, static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, unsigned int trk, unsigned int totrk, int cmd, struct dasd_device *basedev, struct dasd_device *startdev, - unsigned char format, unsigned int rec_on_trk, int count, + unsigned int format, unsigned int rec_on_trk, int count, unsigned int blksize, unsigned int tlf) { struct dasd_eckd_private *basepriv, *startpriv; - struct DE_eckd_data *dedata; struct LRE_eckd_data *lredata; - u32 begcyl, endcyl; - u16 heads, beghead, endhead; + struct DE_eckd_data *dedata; int rc = 0; basepriv = basedev->private; @@ -527,98 +536,19 @@ static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata, pfxdata->validity.hyper_pav = 1; } - /* define extend data (mostly)*/ - switch (cmd) { - case DASD_ECKD_CCW_READ_HOME_ADDRESS: - case DASD_ECKD_CCW_READ_RECORD_ZERO: - case DASD_ECKD_CCW_READ: - case DASD_ECKD_CCW_READ_MT: - case DASD_ECKD_CCW_READ_CKD: - case DASD_ECKD_CCW_READ_CKD_MT: - case DASD_ECKD_CCW_READ_KD: - case DASD_ECKD_CCW_READ_KD_MT: - dedata->mask.perm = 0x1; - dedata->attributes.operation = basepriv->attrib.operation; - break; - case DASD_ECKD_CCW_READ_COUNT: - dedata->mask.perm = 0x1; - dedata->attributes.operation = DASD_BYPASS_CACHE; - break; - case DASD_ECKD_CCW_READ_TRACK: - case DASD_ECKD_CCW_READ_TRACK_DATA: - dedata->mask.perm = 0x1; - dedata->attributes.operation = basepriv->attrib.operation; - dedata->blk_size = 0; - break; - case DASD_ECKD_CCW_WRITE: - case DASD_ECKD_CCW_WRITE_MT: - case DASD_ECKD_CCW_WRITE_KD: - case DASD_ECKD_CCW_WRITE_KD_MT: - dedata->mask.perm = 0x02; - dedata->attributes.operation = basepriv->attrib.operation; - rc = check_XRC_on_prefix(pfxdata, basedev); - break; - case DASD_ECKD_CCW_WRITE_CKD: - case DASD_ECKD_CCW_WRITE_CKD_MT: - dedata->attributes.operation = DASD_BYPASS_CACHE; - rc = check_XRC_on_prefix(pfxdata, basedev); - break; - case DASD_ECKD_CCW_ERASE: - case DASD_ECKD_CCW_WRITE_HOME_ADDRESS: - case DASD_ECKD_CCW_WRITE_RECORD_ZERO: - dedata->mask.perm = 0x3; - dedata->mask.auth = 0x1; - 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; - dedata->blk_size = blksize; - rc = check_XRC_on_prefix(pfxdata, basedev); - break; - default: - DBF_DEV_EVENT(DBF_ERR, basedev, - "PFX LRE unknown opcode 0x%x", cmd); - BUG(); - return -EINVAL; - } - - dedata->attributes.mode = 0x3; /* ECKD */ - - if ((basepriv->rdc_data.cu_type == 0x2105 || - basepriv->rdc_data.cu_type == 0x2107 || - basepriv->rdc_data.cu_type == 0x1750) - && !(basepriv->uses_cdl && trk < 2)) - dedata->ga_extended |= 0x40; /* Regular Data Format Mode */ - - heads = basepriv->rdc_data.trk_per_cyl; - begcyl = trk / heads; - beghead = trk % heads; - endcyl = totrk / heads; - endhead = totrk % heads; - - /* check for sequential prestage - enhance cylinder range */ - if (dedata->attributes.operation == DASD_SEQ_PRESTAGE || - dedata->attributes.operation == DASD_SEQ_ACCESS) { - - if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl) - endcyl += basepriv->attrib.nr_cyl; - else - endcyl = (basepriv->real_cyl - 1); - } + rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize); - set_ch_t(&dedata->beg_ext, begcyl, beghead); - set_ch_t(&dedata->end_ext, endcyl, endhead); + /* + * For some commands the System Time Stamp is set in the define extent + * data when XRC is supported. The validity of the time stamp must be + * reflected in the prefix data as well. + */ + if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02) + pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */ if (format == 1) { - fill_LRE_data(lredata, trk, rec_on_trk, count, cmd, - basedev, blksize, tlf); + locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd, + basedev, blksize, tlf); } return rc; @@ -1887,7 +1817,7 @@ dasd_eckd_analysis_ccw(struct dasd_device *device) ccw = cqr->cpaddr; /* Define extent for the first 3 tracks. */ define_extent(ccw++, cqr->data, 0, 2, - DASD_ECKD_CCW_READ_COUNT, device); + DASD_ECKD_CCW_READ_COUNT, device, 0); LO_data = cqr->data + sizeof(struct DE_eckd_data); /* Locate record for the first 4 records on track 0. */ ccw[-1].flags |= CCW_FLAG_CC; @@ -2266,7 +2196,7 @@ dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata, count, 0, 0); } else { define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit, - DASD_ECKD_CCW_READ_COUNT, startdev); + DASD_ECKD_CCW_READ_COUNT, startdev, 0); data += sizeof(struct DE_eckd_data); ccw[-1].flags |= CCW_FLAG_CC; @@ -2420,7 +2350,7 @@ dasd_eckd_build_format(struct dasd_device *base, } else { define_extent(ccw++, (struct DE_eckd_data *) data, fdata->start_unit, fdata->stop_unit, - DASD_ECKD_CCW_WRITE_CKD, startdev); + DASD_ECKD_CCW_WRITE_CKD, startdev, 0); /* grant subsystem permission to format R0 */ if (r0_perm) ((struct DE_eckd_data *) data) @@ -2444,7 +2374,7 @@ dasd_eckd_build_format(struct dasd_device *base, } else { define_extent(ccw++, (struct DE_eckd_data *) data, fdata->start_unit, fdata->stop_unit, - DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev); + DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0); data += sizeof(struct DE_eckd_data); } ccw[-1].flags |= CCW_FLAG_CC; @@ -2463,7 +2393,7 @@ dasd_eckd_build_format(struct dasd_device *base, } else { define_extent(ccw++, (struct DE_eckd_data *) data, fdata->start_unit, fdata->stop_unit, - DASD_ECKD_CCW_WRITE_CKD, startdev); + DASD_ECKD_CCW_WRITE_CKD, startdev, 0); data += sizeof(struct DE_eckd_data); } ccw[-1].flags |= CCW_FLAG_CC; @@ -3187,7 +3117,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single( sizeof(struct PFX_eckd_data)); } else { if (define_extent(ccw++, cqr->data, first_trk, - last_trk, cmd, basedev) == -EAGAIN) { + last_trk, cmd, basedev, 0) == -EAGAIN) { /* Clock not in sync and XRC is enabled. * Try again later. */ @@ -3509,12 +3439,19 @@ static int prepare_itcw(struct itcw *itcw, dedata->mask.perm = 0x02; dedata->attributes.operation = basepriv->attrib.operation; dedata->blk_size = blksize; - rc = check_XRC_on_prefix(&pfxdata, basedev); + rc = check_XRC(NULL, dedata, basedev); dedata->ga_extended |= 0x42; lredata->operation.orientation = 0x0; lredata->operation.operation = 0x3F; lredata->extended_operation = 0x23; lredata->auxiliary.check_bytes = 0x2; + /* + * If XRC is supported the System Time Stamp is set. The + * validity of the time stamp must be reflected in the prefix + * data as well. + */ + if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02) + pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */ pfx_cmd = DASD_ECKD_CCW_PFX; break; case DASD_ECKD_CCW_READ_COUNT_MT: diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h index e2a710c250a5..fb1f537d986a 100644 --- a/drivers/s390/block/dasd_eckd.h +++ b/drivers/s390/block/dasd_eckd.h @@ -29,6 +29,7 @@ #define DASD_ECKD_CCW_SNID 0x34 #define DASD_ECKD_CCW_RSSD 0x3e #define DASD_ECKD_CCW_LOCATE_RECORD 0x47 +#define DASD_ECKD_CCW_LOCATE_RECORD_EXT 0x4b #define DASD_ECKD_CCW_SNSS 0x54 #define DASD_ECKD_CCW_DEFINE_EXTENT 0x63 #define DASD_ECKD_CCW_WRITE_MT 0x85 |