diff options
Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.c | 1722 |
1 files changed, 1722 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c new file mode 100644 index 00000000000..838aedf78a5 --- /dev/null +++ b/drivers/s390/block/dasd_eckd.c @@ -0,0 +1,1722 @@ +/* + * File...........: linux/drivers/s390/block/dasd_eckd.c + * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> + * Horst Hummel <Horst.Hummel@de.ibm.com> + * Carsten Otte <Cotte@de.ibm.com> + * Martin Schwidefsky <schwidefsky@de.ibm.com> + * Bugreports.to..: <Linux390@de.ibm.com> + * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 + * + * $Revision: 1.69 $ + */ + +#include <linux/config.h> +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/hdreg.h> /* HDIO_GETGEO */ +#include <linux/bio.h> +#include <linux/module.h> +#include <linux/init.h> + +#include <asm/debug.h> +#include <asm/idals.h> +#include <asm/ebcdic.h> +#include <asm/io.h> +#include <asm/todclk.h> +#include <asm/uaccess.h> +#include <asm/ccwdev.h> + +#include "dasd_int.h" +#include "dasd_eckd.h" + +#ifdef PRINTK_HEADER +#undef PRINTK_HEADER +#endif /* PRINTK_HEADER */ +#define PRINTK_HEADER "dasd(eckd):" + +#define ECKD_C0(i) (i->home_bytes) +#define ECKD_F(i) (i->formula) +#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\ + (i->factors.f_0x02.f1)) +#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\ + (i->factors.f_0x02.f2)) +#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\ + (i->factors.f_0x02.f3)) +#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0) +#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0) +#define ECKD_F6(i) (i->factor6) +#define ECKD_F7(i) (i->factor7) +#define ECKD_F8(i) (i->factor8) + +MODULE_LICENSE("GPL"); + +static struct dasd_discipline dasd_eckd_discipline; + +struct dasd_eckd_private { + struct dasd_eckd_characteristics rdc_data; + struct dasd_eckd_confdata conf_data; + struct dasd_eckd_path path_data; + struct eckd_count count_area[5]; + int init_cqr_status; + int uses_cdl; + struct attrib_data_t attrib; /* e.g. cache operations */ +}; + +/* The ccw bus type uses this table to find devices that it sends to + * dasd_eckd_probe */ +static struct ccw_device_id dasd_eckd_ids[] = { + { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), driver_info: 0x1}, + { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), driver_info: 0x2}, + { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), driver_info: 0x3}, + { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), driver_info: 0x4}, + { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), driver_info: 0x5}, + { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), driver_info: 0x6}, + { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), driver_info: 0x7}, + { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), driver_info: 0x8}, + { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), driver_info: 0x9}, + { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), driver_info: 0xa}, + { /* end of list */ }, +}; + +MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids); + +static struct ccw_driver dasd_eckd_driver; /* see below */ + +/* initial attempt at a probe function. this can be simplified once + * the other detection code is gone */ +static int +dasd_eckd_probe (struct ccw_device *cdev) +{ + int ret; + + ret = dasd_generic_probe (cdev, &dasd_eckd_discipline); + if (ret) + return ret; + ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE); + return 0; +} + +static int +dasd_eckd_set_online(struct ccw_device *cdev) +{ + return dasd_generic_set_online (cdev, &dasd_eckd_discipline); +} + +static struct ccw_driver dasd_eckd_driver = { + .name = "dasd-eckd", + .owner = THIS_MODULE, + .ids = dasd_eckd_ids, + .probe = dasd_eckd_probe, + .remove = dasd_generic_remove, + .set_offline = dasd_generic_set_offline, + .set_online = dasd_eckd_set_online, + .notify = dasd_generic_notify, +}; + +static const int sizes_trk0[] = { 28, 148, 84 }; +#define LABEL_SIZE 140 + +static inline unsigned int +round_up_multiple(unsigned int no, unsigned int mult) +{ + int rem = no % mult; + return (rem ? no - rem + mult : no); +} + +static inline unsigned int +ceil_quot(unsigned int d1, unsigned int d2) +{ + return (d1 + (d2 - 1)) / d2; +} + +static inline int +bytes_per_record(struct dasd_eckd_characteristics *rdc, int kl, int dl) +{ + unsigned int fl1, fl2, int1, int2; + int bpr; + + switch (rdc->formula) { + case 0x01: + fl1 = round_up_multiple(ECKD_F2(rdc) + dl, ECKD_F1(rdc)); + fl2 = round_up_multiple(kl ? ECKD_F2(rdc) + kl : 0, + ECKD_F1(rdc)); + bpr = fl1 + fl2; + break; + case 0x02: + int1 = ceil_quot(dl + ECKD_F6(rdc), ECKD_F5(rdc) << 1); + int2 = ceil_quot(kl + ECKD_F6(rdc), ECKD_F5(rdc) << 1); + fl1 = round_up_multiple(ECKD_F1(rdc) * ECKD_F2(rdc) + dl + + ECKD_F6(rdc) + ECKD_F4(rdc) * int1, + ECKD_F1(rdc)); + fl2 = round_up_multiple(ECKD_F1(rdc) * ECKD_F3(rdc) + kl + + ECKD_F6(rdc) + ECKD_F4(rdc) * int2, + ECKD_F1(rdc)); + bpr = fl1 + fl2; + break; + default: + bpr = 0; + break; + } + return bpr; +} + +static inline unsigned int +bytes_per_track(struct dasd_eckd_characteristics *rdc) +{ + return *(unsigned int *) (rdc->byte_per_track) >> 8; +} + +static inline unsigned int +recs_per_track(struct dasd_eckd_characteristics * rdc, + unsigned int kl, unsigned int dl) +{ + int dn, kn; + + switch (rdc->dev_type) { + case 0x3380: + if (kl) + return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) + + ceil_quot(dl + 12, 32)); + else + return 1499 / (15 + ceil_quot(dl + 12, 32)); + case 0x3390: + dn = ceil_quot(dl + 6, 232) + 1; + if (kl) { + kn = ceil_quot(kl + 6, 232) + 1; + return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) + + 9 + ceil_quot(dl + 6 * dn, 34)); + } else + return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34)); + case 0x9345: + dn = ceil_quot(dl + 6, 232) + 1; + if (kl) { + kn = ceil_quot(kl + 6, 232) + 1; + return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) + + ceil_quot(dl + 6 * dn, 34)); + } else + return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34)); + } + return 0; +} + +static inline void +check_XRC (struct ccw1 *de_ccw, + struct DE_eckd_data *data, + struct dasd_device *device) +{ + struct dasd_eckd_private *private; + + private = (struct dasd_eckd_private *) device->private; + + /* switch on System Time Stamp - needed for XRC Support */ + if (private->rdc_data.facilities.XRC_supported) { + + data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */ + data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */ + + data->ep_sys_time = get_clock (); + + de_ccw->count = sizeof (struct DE_eckd_data); + de_ccw->flags |= CCW_FLAG_SLI; + } + + return; + +} /* end check_XRC */ + +static inline void +define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk, + int totrk, int cmd, struct dasd_device * device) +{ + struct dasd_eckd_private *private; + struct ch_t geo, beg, end; + + private = (struct dasd_eckd_private *) device->private; + + 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) { + 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: + case DASD_ECKD_CCW_READ_COUNT: + data->mask.perm = 0x1; + data->attributes.operation = private->attrib.operation; + 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; + 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; + check_XRC (ccw, data, device); + break; + case DASD_ECKD_CCW_ERASE: + case DASD_ECKD_CCW_WRITE_HOME_ADDRESS: + case DASD_ECKD_CCW_WRITE_RECORD_ZERO: + data->mask.perm = 0x3; + data->mask.auth = 0x1; + data->attributes.operation = DASD_BYPASS_CACHE; + check_XRC (ccw, data, device); + break; + default: + DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd); + break; + } + + data->attributes.mode = 0x3; /* ECKD */ + + if ((private->rdc_data.cu_type == 0x2105 || + private->rdc_data.cu_type == 0x2107 || + private->rdc_data.cu_type == 0x1750) + && !(private->uses_cdl && trk < 2)) + data->ga_extended |= 0x40; /* Regular Data Format Mode */ + + geo.cyl = private->rdc_data.no_cyl; + geo.head = private->rdc_data.trk_per_cyl; + beg.cyl = trk / geo.head; + beg.head = trk % geo.head; + end.cyl = totrk / geo.head; + end.head = totrk % geo.head; + + /* check for sequential prestage - enhance cylinder range */ + if (data->attributes.operation == DASD_SEQ_PRESTAGE || + data->attributes.operation == DASD_SEQ_ACCESS) { + + if (end.cyl + private->attrib.nr_cyl < geo.cyl) + end.cyl += private->attrib.nr_cyl; + else + end.cyl = (geo.cyl - 1); + } + + data->beg_ext.cyl = beg.cyl; + data->beg_ext.head = beg.head; + data->end_ext.cyl = end.cyl; + data->end_ext.head = end.head; +} + +static inline void +locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk, + int rec_on_trk, int no_rec, int cmd, + struct dasd_device * device, int reclen) +{ + struct dasd_eckd_private *private; + int sector; + int dn, d; + + private = (struct dasd_eckd_private *) device->private; + + DBF_DEV_EVENT(DBF_INFO, device, + "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d", + trk, rec_on_trk, no_rec, cmd, reclen); + + ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD; + ccw->flags = 0; + ccw->count = 16; + ccw->cda = (__u32) __pa(data); + + memset(data, 0, sizeof (struct LO_eckd_data)); + sector = 0; + if (rec_on_trk) { + switch (private->rdc_data.dev_type) { + case 0x3390: + dn = ceil_quot(reclen + 6, 232); + d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34); + sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8; + break; + case 0x3380: + d = 7 + ceil_quot(reclen + 12, 32); + sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7; + break; + } + } + data->sector = sector; + data->count = no_rec; + switch (cmd) { + case DASD_ECKD_CCW_WRITE_HOME_ADDRESS: + data->operation.orientation = 0x3; + data->operation.operation = 0x03; + break; + case DASD_ECKD_CCW_READ_HOME_ADDRESS: + data->operation.orientation = 0x3; + data->operation.operation = 0x16; + break; + case DASD_ECKD_CCW_WRITE_RECORD_ZERO: + data->operation.orientation = 0x1; + data->operation.operation = 0x03; + data->count++; + break; + case DASD_ECKD_CCW_READ_RECORD_ZERO: + data->operation.orientation = 0x3; + data->operation.operation = 0x16; + data->count++; + 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->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x01; + break; + case DASD_ECKD_CCW_WRITE_CKD: + case DASD_ECKD_CCW_WRITE_CKD_MT: + data->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x03; + break; + case DASD_ECKD_CCW_READ: + case DASD_ECKD_CCW_READ_MT: + case DASD_ECKD_CCW_READ_KD: + case DASD_ECKD_CCW_READ_KD_MT: + data->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x06; + break; + case DASD_ECKD_CCW_READ_CKD: + case DASD_ECKD_CCW_READ_CKD_MT: + data->auxiliary.last_bytes_used = 0x1; + data->length = reclen; + data->operation.operation = 0x16; + break; + case DASD_ECKD_CCW_READ_COUNT: + data->operation.operation = 0x06; + break; + case DASD_ECKD_CCW_ERASE: + data->length = reclen; + data->auxiliary.last_bytes_used = 0x1; + data->operation.operation = 0x0b; + break; + default: + DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd); + } + data->seek_addr.cyl = data->search_arg.cyl = + trk / private->rdc_data.trk_per_cyl; + data->seek_addr.head = data->search_arg.head = + trk % private->rdc_data.trk_per_cyl; + data->search_arg.record = rec_on_trk; +} + +/* + * Returns 1 if the block is one of the special blocks that needs + * to get read/written with the KD variant of the command. + * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and + * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT. + * Luckily the KD variants differ only by one bit (0x08) from the + * normal variant. So don't wonder about code like: + * if (dasd_eckd_cdl_special(blk_per_trk, recid)) + * ccw->cmd_code |= 0x8; + */ +static inline int +dasd_eckd_cdl_special(int blk_per_trk, int recid) +{ + if (recid < 3) + return 1; + if (recid < blk_per_trk) + return 0; + if (recid < 2 * blk_per_trk) + return 1; + return 0; +} + +/* + * Returns the record size for the special blocks of the cdl format. + * Only returns something useful if dasd_eckd_cdl_special is true + * for the recid. + */ +static inline int +dasd_eckd_cdl_reclen(int recid) +{ + if (recid < 3) + return sizes_trk0[recid]; + return LABEL_SIZE; +} + +static int +dasd_eckd_read_conf(struct dasd_device *device) +{ + void *conf_data; + int conf_len, conf_data_saved; + int rc; + __u8 lpm; + struct dasd_eckd_private *private; + struct dasd_eckd_path *path_data; + + private = (struct dasd_eckd_private *) device->private; + path_data = (struct dasd_eckd_path *) &private->path_data; + path_data->opm = ccw_device_get_path_mask(device->cdev); + lpm = 0x80; + conf_data_saved = 0; + + /* get configuration data per operational path */ + for (lpm = 0x80; lpm; lpm>>= 1) { + if (lpm & path_data->opm){ + rc = read_conf_data_lpm(device->cdev, &conf_data, + &conf_len, lpm); + if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */ + MESSAGE(KERN_WARNING, + "Read configuration data returned " + "error %d", rc); + return rc; + } + if (conf_data == NULL) { + MESSAGE(KERN_WARNING, "%s", "No configuration " + "data retrieved"); + continue; /* no errror */ + } + if (conf_len != sizeof (struct dasd_eckd_confdata)) { + MESSAGE(KERN_WARNING, + "sizes of configuration data mismatch" + "%d (read) vs %ld (expected)", + conf_len, + sizeof (struct dasd_eckd_confdata)); + kfree(conf_data); + continue; /* no errror */ + } + /* save first valid configuration data */ + if (!conf_data_saved){ + memcpy(&private->conf_data, conf_data, + sizeof (struct dasd_eckd_confdata)); + conf_data_saved++; + } + switch (((char *)conf_data)[242] & 0x07){ + case 0x02: + path_data->npm |= lpm; + break; + case 0x03: + path_data->ppm |= lpm; + break; + } + kfree(conf_data); + } + } + return 0; +} + + +static int +dasd_eckd_check_characteristics(struct dasd_device *device) +{ + struct dasd_eckd_private *private; + void *rdc_data; + int rc; + + private = (struct dasd_eckd_private *) device->private; + if (private == NULL) { + private = kmalloc(sizeof(struct dasd_eckd_private), + GFP_KERNEL | GFP_DMA); + if (private == NULL) { + DEV_MESSAGE(KERN_WARNING, device, "%s", + "memory allocation failed for private " + "data"); + return -ENOMEM; + } + memset(private, 0, sizeof(struct dasd_eckd_private)); + device->private = (void *) private; + } + /* Invalidate status of initial analysis. */ + private->init_cqr_status = -1; + /* Set default cache operations. */ + private->attrib.operation = DASD_NORMAL_CACHE; + private->attrib.nr_cyl = 0; + + /* Read Device Characteristics */ + rdc_data = (void *) &(private->rdc_data); + rc = read_dev_chars(device->cdev, &rdc_data, 64); + if (rc) { + DEV_MESSAGE(KERN_WARNING, device, + "Read device characteristics returned error %d", + rc); + return rc; + } + + DEV_MESSAGE(KERN_INFO, device, + "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d", + private->rdc_data.dev_type, + private->rdc_data.dev_model, + private->rdc_data.cu_type, + private->rdc_data.cu_model.model, + private->rdc_data.no_cyl, + private->rdc_data.trk_per_cyl, + private->rdc_data.sec_per_trk); + + /* Read Configuration Data */ + rc = dasd_eckd_read_conf (device); + return rc; + +} + +static struct dasd_ccw_req * +dasd_eckd_analysis_ccw(struct dasd_device *device) +{ + struct dasd_eckd_private *private; + struct eckd_count *count_data; + struct LO_eckd_data *LO_data; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int cplength, datasize; + int i; + + private = (struct dasd_eckd_private *) device->private; + + cplength = 8; + datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data); + cqr = dasd_smalloc_request(dasd_eckd_discipline.name, + cplength, datasize, device); + if (IS_ERR(cqr)) + return cqr; + ccw = cqr->cpaddr; + /* Define extent for the first 3 tracks. */ + define_extent(ccw++, cqr->data, 0, 2, + DASD_ECKD_CCW_READ_COUNT, device); + 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; + locate_record(ccw++, LO_data++, 0, 0, 4, + DASD_ECKD_CCW_READ_COUNT, device, 0); + + count_data = private->count_area; + for (i = 0; i < 4; i++) { + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT; + ccw->flags = 0; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) count_data; + ccw++; + count_data++; + } + + /* Locate record for the first record on track 2. */ + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, 2, 0, 1, + DASD_ECKD_CCW_READ_COUNT, device, 0); + /* Read count ccw. */ + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT; + ccw->flags = 0; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) count_data; + + cqr->device = device; + cqr->retries = 0; + cqr->buildclk = get_clock(); + cqr->status = DASD_CQR_FILLED; + return cqr; +} + +/* + * This is the callback function for the init_analysis cqr. It saves + * the status of the initial analysis ccw before it frees it and kicks + * the device to continue the startup sequence. This will call + * dasd_eckd_do_analysis again (if the devices has not been marked + * for deletion in the meantime). + */ +static void +dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data) +{ + struct dasd_eckd_private *private; + struct dasd_device *device; + + device = init_cqr->device; + private = (struct dasd_eckd_private *) device->private; + private->init_cqr_status = init_cqr->status; + dasd_sfree_request(init_cqr, device); + dasd_kick_device(device); +} + +static int +dasd_eckd_start_analysis(struct dasd_device *device) +{ + struct dasd_eckd_private *private; + struct dasd_ccw_req *init_cqr; + + private = (struct dasd_eckd_private *) device->private; + init_cqr = dasd_eckd_analysis_ccw(device); + if (IS_ERR(init_cqr)) + return PTR_ERR(init_cqr); + init_cqr->callback = dasd_eckd_analysis_callback; + init_cqr->callback_data = NULL; + init_cqr->expires = 5*HZ; + dasd_add_request_head(init_cqr); + return -EAGAIN; +} + +static int +dasd_eckd_end_analysis(struct dasd_device *device) +{ + struct dasd_eckd_private *private; + struct eckd_count *count_area; + unsigned int sb, blk_per_trk; + int status, i; + + private = (struct dasd_eckd_private *) device->private; + status = private->init_cqr_status; + private->init_cqr_status = -1; + if (status != DASD_CQR_DONE) { + DEV_MESSAGE(KERN_WARNING, device, "%s", + "volume analysis returned unformatted disk"); + return -EMEDIUMTYPE; + } + + private->uses_cdl = 1; + /* Calculate number of blocks/records per track. */ + blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block); + /* Check Track 0 for Compatible Disk Layout */ + count_area = NULL; + for (i = 0; i < 3; i++) { + if (private->count_area[i].kl != 4 || + private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) { + private->uses_cdl = 0; + break; + } + } + if (i == 3) + count_area = &private->count_area[4]; + + if (private->uses_cdl == 0) { + for (i = 0; i < 5; i++) { + if ((private->count_area[i].kl != 0) || + (private->count_area[i].dl != + private->count_area[0].dl)) + break; + } + if (i == 5) + count_area = &private->count_area[0]; + } else { + if (private->count_area[3].record == 1) + DEV_MESSAGE(KERN_WARNING, device, "%s", + "Trk 0: no records after VTOC!"); + } + if (count_area != NULL && count_area->kl == 0) { + /* we found notthing violating our disk layout */ + if (dasd_check_blocksize(count_area->dl) == 0) + device->bp_block = count_area->dl; + } + if (device->bp_block == 0) { + DEV_MESSAGE(KERN_WARNING, device, "%s", + "Volume has incompatible disk layout"); + return -EMEDIUMTYPE; + } + device->s2b_shift = 0; /* bits to shift 512 to get a block */ + for (sb = 512; sb < device->bp_block; sb = sb << 1) + device->s2b_shift++; + + blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block); + device->blocks = (private->rdc_data.no_cyl * + private->rdc_data.trk_per_cyl * + blk_per_trk); + + DEV_MESSAGE(KERN_INFO, device, + "(%dkB blks): %dkB at %dkB/trk %s", + (device->bp_block >> 10), + ((private->rdc_data.no_cyl * + private->rdc_data.trk_per_cyl * + blk_per_trk * (device->bp_block >> 9)) >> 1), + ((blk_per_trk * device->bp_block) >> 10), + private->uses_cdl ? + "compatible disk layout" : "linux disk layout"); + + return 0; +} + +static int +dasd_eckd_do_analysis(struct dasd_device *device) +{ + struct dasd_eckd_private *private; + + private = (struct dasd_eckd_private *) device->private; + if (private->init_cqr_status < 0) + return dasd_eckd_start_analysis(device); + else + return dasd_eckd_end_analysis(device); +} + +static int +dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo) +{ + struct dasd_eckd_private *private; + + private = (struct dasd_eckd_private *) device->private; + if (dasd_check_blocksize(device->bp_block) == 0) { + geo->sectors = recs_per_track(&private->rdc_data, + 0, device->bp_block); + } + geo->cylinders = private->rdc_data.no_cyl; + geo->heads = private->rdc_data.trk_per_cyl; + return 0; +} + +static struct dasd_ccw_req * +dasd_eckd_format_device(struct dasd_device * device, + struct format_data_t * fdata) +{ + struct dasd_eckd_private *private; + struct dasd_ccw_req *fcp; + struct eckd_count *ect; + struct ccw1 *ccw; + void *data; + int rpt, cyl, head; + int cplength, datasize; + int i; + + private = (struct dasd_eckd_private *) device->private; + rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize); + cyl = fdata->start_unit / private->rdc_data.trk_per_cyl; + head = fdata->start_unit % private->rdc_data.trk_per_cyl; + + /* Sanity checks. */ + if (fdata->start_unit >= + (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) { + DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!", + fdata->start_unit); + return ERR_PTR(-EINVAL); + } + if (fdata->start_unit > fdata->stop_unit) { + DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.", + fdata->start_unit); + return ERR_PTR(-EINVAL); + } + if (dasd_check_blocksize(fdata->blksize) != 0) { + DEV_MESSAGE(KERN_WARNING, device, + "Invalid blocksize %d...terminating!", + fdata->blksize); + return ERR_PTR(-EINVAL); + } + + /* + * fdata->intensity is a bit string that tells us what to do: + * Bit 0: write record zero + * Bit 1: write home address, currently not supported + * Bit 2: invalidate tracks + * Bit 3: use OS/390 compatible disk layout (cdl) + * Only some bit combinations do make sense. + */ + switch (fdata->intensity) { + case 0x00: /* Normal format */ + case 0x08: /* Normal format, use cdl. */ + cplength = 2 + rpt; + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + rpt * sizeof(struct eckd_count); + break; + case 0x01: /* Write record zero and format track. */ + case 0x09: /* Write record zero and format track, use cdl. */ + cplength = 3 + rpt; + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count) + + rpt * sizeof(struct eckd_count); + break; + case 0x04: /* Invalidate track. */ + case 0x0c: /* Invalidate track, use cdl. */ + cplength = 3; + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count); + break; + default: + DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.", + fdata->intensity); + return ERR_PTR(-EINVAL); + } + /* Allocate the format ccw request. */ + fcp = dasd_smalloc_request(dasd_eckd_discipline.name, + cplength, datasize, device); + if (IS_ERR(fcp)) + return fcp; + + data = fcp->data; + ccw = fcp->cpaddr; + + switch (fdata->intensity & ~0x08) { + case 0x00: /* Normal format. */ + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->start_unit, + DASD_ECKD_CCW_WRITE_CKD, device); + data += sizeof(struct DE_eckd_data); + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, (struct LO_eckd_data *) data, + fdata->start_unit, 0, rpt, + DASD_ECKD_CCW_WRITE_CKD, device, + fdata->blksize); + data += sizeof(struct LO_eckd_data); + break; + case 0x01: /* Write record zero + format track. */ + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->start_unit, + DASD_ECKD_CCW_WRITE_RECORD_ZERO, + device); + data += sizeof(struct DE_eckd_data); + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, (struct LO_eckd_data *) data, + fdata->start_unit, 0, rpt + 1, + DASD_ECKD_CCW_WRITE_RECORD_ZERO, device, + device->bp_block); + data += sizeof(struct LO_eckd_data); + break; + case 0x04: /* Invalidate track. */ + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->start_unit, + DASD_ECKD_CCW_WRITE_CKD, device); + data += sizeof(struct DE_eckd_data); + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, (struct LO_eckd_data *) data, + fdata->start_unit, 0, 1, + DASD_ECKD_CCW_WRITE_CKD, device, 8); + data += sizeof(struct LO_eckd_data); + break; + } + if (fdata->intensity & 0x01) { /* write record zero */ + ect = (struct eckd_count *) data; + data += sizeof(struct eckd_count); + ect->cyl = cyl; + ect->head = head; + ect->record = 0; + ect->kl = 0; + ect->dl = 8; + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) ect; + ccw++; + } + if ((fdata->intensity & ~0x08) & 0x04) { /* erase track */ + ect = (struct eckd_count *) data; + data += sizeof(struct eckd_count); + ect->cyl = cyl; + ect->head = head; + ect->record = 1; + ect->kl = 0; + ect->dl = 0; + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) ect; + } else { /* write remaining records */ + for (i = 0; i < rpt; i++) { + ect = (struct eckd_count *) data; + data += sizeof(struct eckd_count); + ect->cyl = cyl; + ect->head = head; + ect->record = i + 1; + ect->kl = 0; + ect->dl = fdata->blksize; + /* Check for special tracks 0-1 when formatting CDL */ + if ((fdata->intensity & 0x08) && + fdata->start_unit == 0) { + if (i < 3) { + ect->kl = 4; + ect->dl = sizes_trk0[i] - 4; + } + } + if ((fdata->intensity & 0x08) && + fdata->start_unit == 1) { + ect->kl = 44; + ect->dl = LABEL_SIZE - 44; + } + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD; + ccw->flags = CCW_FLAG_SLI; + ccw->count = 8; + ccw->cda = (__u32)(addr_t) ect; + ccw++; + } + } + fcp->device = device; + fcp->retries = 2; /* set retry counter to enable ERP */ + fcp->buildclk = get_clock(); + fcp->status = DASD_CQR_FILLED; + return fcp; +} + +static dasd_era_t +dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb) +{ + struct dasd_device *device = (struct dasd_device *) cqr->device; + struct ccw_device *cdev = device->cdev; + + if (irb->scsw.cstat == 0x00 && + irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END)) + return dasd_era_none; + + switch (cdev->id.cu_type) { + case 0x3990: + case 0x2105: + case 0x2107: + case 0x1750: + return dasd_3990_erp_examine(cqr, irb); + case 0x9343: + return dasd_9343_erp_examine(cqr, irb); + case 0x3880: + default: + DEV_MESSAGE(KERN_WARNING, device, "%s", + "default (unknown CU type) - RECOVERABLE return"); + return dasd_era_recover; + } +} + +static dasd_erp_fn_t +dasd_eckd_erp_action(struct dasd_ccw_req * cqr) +{ + struct dasd_device *device = (struct dasd_device *) cqr->device; + struct ccw_device *cdev = device->cdev; + + switch (cdev->id.cu_type) { + case 0x3990: + case 0x2105: + case 0x2107: + case 0x1750: + return dasd_3990_erp_action; + case 0x9343: + case 0x3880: + default: + return dasd_default_erp_action; + } +} + +static dasd_erp_fn_t +dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr) +{ + return dasd_default_erp_postaction; +} + +static struct dasd_ccw_req * +dasd_eckd_build_cp(struct dasd_device * device, struct request *req) +{ + struct dasd_eckd_private *private; + unsigned long *idaws; + struct LO_eckd_data *LO_data; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + struct bio *bio; + struct bio_vec *bv; + char *dst; + unsigned int blksize, blk_per_trk, off; + int count, cidaw, cplength, datasize; + sector_t recid, first_rec, last_rec; + sector_t first_trk, last_trk; + unsigned int first_offs, last_offs; + unsigned char cmd, rcmd; + int i; + + private = (struct dasd_eckd_private *) device->private; + if (rq_data_dir(req) == READ) + cmd = DASD_ECKD_CCW_READ_MT; + else if (rq_data_dir(req) == WRITE) + cmd = DASD_ECKD_CCW_WRITE_MT; + else + return ERR_PTR(-EINVAL); + /* Calculate number of blocks/records per track. */ + blksize = device->bp_block; + blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize); + /* Calculate record id of first and last block. */ + first_rec = first_trk = req->sector >> device->s2b_shift; + first_offs = sector_div(first_trk, blk_per_trk); + last_rec = last_trk = + (req->sector + req->nr_sectors - 1) >> device->s2b_shift; + last_offs = sector_div(last_trk, blk_per_trk); + /* Check struct bio and count the number of blocks for the request. */ + count = 0; + cidaw = 0; + rq_for_each_bio(bio, req) { + bio_for_each_segment(bv, bio, i) { + if (bv->bv_len & (blksize - 1)) + /* Eckd can only do full blocks. */ + return ERR_PTR(-EINVAL); + count += bv->bv_len >> (device->s2b_shift + 9); +#if defined(CONFIG_ARCH_S390X) + if (idal_is_needed (page_address(bv->bv_page), + bv->bv_len)) + cidaw += bv->bv_len >> (device->s2b_shift + 9); +#endif + } + } + /* Paranoia. */ + if (count != last_rec - first_rec + 1) + return ERR_PTR(-EINVAL); + /* 1x define extent + 1x locate record + number of blocks */ + cplength = 2 + count; + /* 1x define extent + 1x locate record + cidaws*sizeof(long) */ + datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) + + cidaw * sizeof(unsigned long); + /* Find out the number of additional locate record ccws for cdl. */ + if (private->uses_cdl && first_rec < 2*blk_per_trk) { + if (last_rec >= 2*blk_per_trk) + count = 2*blk_per_trk - first_rec; + cplength += count; + datasize += count*sizeof(struct LO_eckd_data); + } + /* Allocate the ccw request. */ + cqr = dasd_smalloc_request(dasd_eckd_discipline.name, + cplength, datasize, device); + if (IS_ERR(cqr)) + return cqr; + ccw = cqr->cpaddr; + /* First ccw is define extent. */ + define_extent(ccw++, cqr->data, first_trk, last_trk, cmd, device); + /* Build locate_record+read/write/ccws. */ + idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data)); + LO_data = (struct LO_eckd_data *) (idaws + cidaw); + recid = first_rec; + if (private->uses_cdl == 0 || recid > 2*blk_per_trk) { + /* Only standard blocks so there is just one locate record. */ + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, first_trk, first_offs + 1, + last_rec - recid + 1, cmd, device, blksize); + } + rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) { + dst = page_address(bv->bv_page) + bv->bv_offset; + if (dasd_page_cache) { + char *copy = kmem_cache_alloc(dasd_page_cache, + SLAB_DMA | __GFP_NOWARN); + if (copy && rq_data_dir(req) == WRITE) + memcpy(copy + bv->bv_offset, dst, bv->bv_len); + if (copy) + dst = copy + bv->bv_offset; + } + for (off = 0; off < bv->bv_len; off += blksize) { + sector_t trkid = recid; + unsigned int recoffs = sector_div(trkid, blk_per_trk); + rcmd = cmd; + count = blksize; + /* Locate record for cdl special block ? */ + if (private->uses_cdl && recid < 2*blk_per_trk) { + if (dasd_eckd_cdl_special(blk_per_trk, recid)){ + rcmd |= 0x8; + count = dasd_eckd_cdl_reclen(recid); + if (count < blksize) + memset(dst + count, 0xe5, + blksize - count); + } + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, + trkid, recoffs + 1, + 1, rcmd, device, count); + } + /* Locate record for standard blocks ? */ + if (private->uses_cdl && recid == 2*blk_per_trk) { + ccw[-1].flags |= CCW_FLAG_CC; + locate_record(ccw++, LO_data++, + trkid, recoffs + 1, + last_rec - recid + 1, + cmd, device, count); + } + /* Read/write ccw. */ + ccw[-1].flags |= CCW |