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authorNigel Hislop <hislop_nigel@emc.com>2008-10-10 21:33:25 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-10-10 21:34:00 +0200
commitab1d848fd6a9151b02c6cbf4bddce6e24707b094 (patch)
tree6476c68b552e2df56a0ebd293d0c9777c735480b
parent3ce66093f5ec5a6ae0ca90c79d81eee15e842293 (diff)
[S390] Add ioctl support for EMC Symmetrix Subsystem Control I/O
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 <hislop_nigel@emc.com> Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/include/asm/dasd.h13
-rw-r--r--drivers/s390/block/dasd_eckd.c101
2 files changed, 114 insertions, 0 deletions
diff --git a/arch/s390/include/asm/dasd.h b/arch/s390/include/asm/dasd.h
index 3f002e13d02..55b2b80cdf6 100644
--- a/arch/s390/include/asm/dasd.h
+++ b/arch/s390/include/asm/dasd.h
@@ -3,6 +3,8 @@
* Author(s)......: Holger Smolinski <Holger.Smolinski@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>
*
* This file is the interface of the DASD device driver, which is exported to user space
* any future changes wrt the API will result in a change of the APIVERSION reported
@@ -202,6 +204,16 @@ typedef struct attrib_data_t {
#define DASD_SEQ_PRESTAGE 0x4
#define DASD_REC_ACCESS 0x5
+/*
+ * Perform EMC Symmetrix I/O
+ */
+typedef struct dasd_symmio_parms {
+ unsigned char reserved[8]; /* compat with older releases */
+ unsigned long long psf_data; /* char * cast to u64 */
+ unsigned long long rssd_result; /* char * cast to u64 */
+ int psf_data_len;
+ int rssd_result_len;
+} __attribute__ ((packed)) dasd_symmio_parms_t;
/********************************************************************************
* SECTION: Definition of IOCTLs
@@ -247,6 +259,7 @@ typedef struct attrib_data_t {
/* Set Attributes (cache operations) */
#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
+#define BIODASDSYMMIO _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)
#endif /* DASD_H */
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;
}