[S390] Add ioctl support for EMC Symmetrix Subsystem Control I/O (ab1d848f) · Commits · e / devices / android_kernel_samsung_universal8895

arch/s390/include/asm/dasd.h

+13 −0

Original line number	Original line	Diff line number	Diff line
	@@ -3,6 +3,8 @@
	* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>		* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
	* Bugreports.to..: <Linux390@de.ibm.com>		* Bugreports.to..: <Linux390@de.ibm.com>
	* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000		* (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		* 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		* 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_SEQ_PRESTAGE 0x4
	#define DASD_REC_ACCESS 0x5		#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		* SECTION: Definition of IOCTLs
	@@ -247,6 +259,7 @@ typedef struct attrib_data_t {
	/* Set Attributes (cache operations) */		/* Set Attributes (cache operations) */
	#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)		#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)

			#define BIODASDSYMMIO _IOWR(DASD_IOCTL_LETTER, 240, dasd_symmio_parms_t)

	#endif /* DASD_H */		#endif /* DASD_H */

drivers/s390/block/dasd_eckd.c

+101 −0

Original line number	Original line	Diff line number	Diff line
	@@ -6,6 +6,8 @@
	* Martin Schwidefsky <schwidefsky@de.ibm.com>		* Martin Schwidefsky <schwidefsky@de.ibm.com>
	* Bugreports.to..: <Linux390@de.ibm.com>		* Bugreports.to..: <Linux390@de.ibm.com>
	* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000		* (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;		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		static int
	dasd_eckd_ioctl(struct dasd_block block, unsigned int cmd, void __user argp)		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);		return dasd_eckd_reserve(device);
	case BIODASDSLCK:		case BIODASDSLCK:
	return dasd_eckd_steal_lock(device);		return dasd_eckd_steal_lock(device);
			case BIODASDSYMMIO:
			return dasd_symm_io(device, argp);
	default:		default:
	return -ENOIOCTLCMD;		return -ENOIOCTLCMD;
	}		}