diff options
Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 8095629bc49..49f9d221e23 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -6,6 +6,8 @@ * Martin Schwidefsky <schwidefsky@de.ibm.com> * Bugreports.to..: <Linux390@de.ibm.com> * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 + * EMC Symmetrix ioctl Copyright EMC Corporation, 2008 + * Author.........: Nigel Hislop <hislop_nigel@emc.com> * */ @@ -2083,6 +2085,103 @@ dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp) return 0; } +/* + * Issue syscall I/O to EMC Symmetrix array. + * CCWs are PSF and RSSD + */ +static int dasd_symm_io(struct dasd_device *device, void __user *argp) +{ + struct dasd_symmio_parms usrparm; + char *psf_data, *rssd_result; + struct dasd_ccw_req *cqr; + struct ccw1 *ccw; + int rc; + + /* Copy parms from caller */ + rc = -EFAULT; + if (copy_from_user(&usrparm, argp, sizeof(usrparm))) + goto out; +#ifndef CONFIG_64BIT + /* Make sure pointers are sane even on 31 bit. */ + if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) { + rc = -EINVAL; + goto out; + } +#endif + /* alloc I/O data area */ + psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA); + rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA); + if (!psf_data || !rssd_result) { + rc = -ENOMEM; + goto out_free; + } + + /* get syscall header from user space */ + rc = -EFAULT; + if (copy_from_user(psf_data, + (void __user *)(unsigned long) usrparm.psf_data, + usrparm.psf_data_len)) + goto out_free; + + /* sanity check on syscall header */ + if (psf_data[0] != 0x17 && psf_data[1] != 0xce) { + rc = -EINVAL; + goto out_free; + } + + /* setup CCWs for PSF + RSSD */ + cqr = dasd_smalloc_request("ECKD", 2 , 0, device); + if (IS_ERR(cqr)) { + DEV_MESSAGE(KERN_WARNING, device, "%s", + "Could not allocate initialization request"); + rc = PTR_ERR(cqr); + goto out_free; + } + + cqr->startdev = device; + cqr->memdev = device; + cqr->retries = 3; + cqr->expires = 10 * HZ; + cqr->buildclk = get_clock(); + cqr->status = DASD_CQR_FILLED; + + /* Build the ccws */ + ccw = cqr->cpaddr; + + /* PSF ccw */ + ccw->cmd_code = DASD_ECKD_CCW_PSF; + ccw->count = usrparm.psf_data_len; + ccw->flags |= CCW_FLAG_CC; + ccw->cda = (__u32)(addr_t) psf_data; + + ccw++; + + /* RSSD ccw */ + ccw->cmd_code = DASD_ECKD_CCW_RSSD; + ccw->count = usrparm.rssd_result_len; + ccw->flags = CCW_FLAG_SLI ; + ccw->cda = (__u32)(addr_t) rssd_result; + + rc = dasd_sleep_on(cqr); + if (rc) + goto out_sfree; + + rc = -EFAULT; + if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result, + rssd_result, usrparm.rssd_result_len)) + goto out_sfree; + rc = 0; + +out_sfree: + dasd_sfree_request(cqr, cqr->memdev); +out_free: + kfree(rssd_result); + kfree(psf_data); +out: + DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc); + return rc; +} + static int dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp) { @@ -2101,6 +2200,8 @@ dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp) return dasd_eckd_reserve(device); case BIODASDSLCK: return dasd_eckd_steal_lock(device); + case BIODASDSYMMIO: + return dasd_symm_io(device, argp); default: return -ENOIOCTLCMD; } |