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[S390] Add ioctl support for EMC Symmetrix Subsystem Control I/O

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EMC Symmetrix Subsystem Control I/O through CKD dasd requires a
specific parameter list sent to the array via a Perform Subsystem
Function CCW. The Symmetrix response is retrieved from the array
via a Read Subsystem Data CCW.

Signed-off-by: Nigel Hislop <[email protected]>
Signed-off-by: Hannes Reinecke <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Nigel Hislop 2008-10-10 21:33:25 +02:00 • committed by Martin Schwidefsky
commit ab1d848fd6
2 changed files with 114 additions and 0 deletions
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101
drivers/s390/block/dasd_eckd.c
View file

@ -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;
}