Commit 3f217cce authored by Stefan Haberland's avatar Stefan Haberland Committed by Jens Axboe
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s390/dasd: add query PPRC function 



Add function to query the Peer-to-Peer-Remote-Copy (PPRC) state of a
device by reading the related structure through a read subsystem data call.

Signed-off-by: default avatarStefan Haberland <sth@linux.ibm.com>
Reviewed-by: default avatarJan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20220920192616.808070-3-sth@linux.ibm.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 2b43bf06

drivers/s390/block/dasd_eckd.c

+66 −0
Original line number Diff line number Diff line
@@ -6086,6 +6086,71 @@ static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m) 
	return 0;

}



/*

 * Perform Subsystem Function - Peer-to-Peer Remote Copy Extended Query

 */

static int dasd_eckd_query_pprc_status(struct dasd_device *device,

				       struct dasd_pprc_data_sc4 *data)

{

	struct dasd_pprc_data_sc4 *pprc_data;

	struct dasd_psf_prssd_data *prssdp;

	struct dasd_ccw_req *cqr;

	struct ccw1 *ccw;

	int rc;



	cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */	+ 1 /* RSSD */,

				   sizeof(*prssdp) + sizeof(*pprc_data) + 1,

				   device, NULL);

	if (IS_ERR(cqr)) {

		DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",

				"Could not allocate query PPRC status request");

		return PTR_ERR(cqr);

	}

	cqr->startdev = device;

	cqr->memdev = device;

	cqr->block = NULL;

	cqr->retries = 256;

	cqr->expires = 10 * HZ;



	/* Prepare for Read Subsystem Data */

	prssdp = (struct dasd_psf_prssd_data *)cqr->data;

	memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));

	prssdp->order = PSF_ORDER_PRSSD;

	prssdp->suborder = PSF_SUBORDER_PPRCEQ;

	prssdp->varies[0] = PPRCEQ_SCOPE_4;

	pprc_data = (struct dasd_pprc_data_sc4 *)(prssdp + 1);



	ccw = cqr->cpaddr;

	ccw->cmd_code = DASD_ECKD_CCW_PSF;

	ccw->count = sizeof(struct dasd_psf_prssd_data);

	ccw->flags |= CCW_FLAG_CC;

	ccw->flags |= CCW_FLAG_SLI;

	ccw->cda = (__u32)(addr_t)prssdp;



	/* Read Subsystem Data - query host access */

	ccw++;

	ccw->cmd_code = DASD_ECKD_CCW_RSSD;

	ccw->count = sizeof(*pprc_data);

	ccw->flags |= CCW_FLAG_SLI;

	ccw->cda = (__u32)(addr_t)pprc_data;



	cqr->buildclk = get_tod_clock();

	cqr->status = DASD_CQR_FILLED;



	rc = dasd_sleep_on_interruptible(cqr);

	if (rc == 0) {

		*data = *pprc_data;

	} else {

		DBF_EVENT_DEVID(DBF_WARNING, device->cdev,

				"PPRC Extended Query failed with rc=%d\n",

				rc);

		rc = -EOPNOTSUPP;

	}



	dasd_sfree_request(cqr, cqr->memdev);

	return rc;

}



/*

 * Perform Subsystem Function - CUIR response

 */
@@ -6705,6 +6770,7 @@ static struct dasd_discipline dasd_eckd_discipline = { 
	.ext_pool_exhaust = dasd_eckd_ext_pool_exhaust,

	.ese_format = dasd_eckd_ese_format,

	.ese_read = dasd_eckd_ese_read,

	.pprc_status = dasd_eckd_query_pprc_status,

};



static int __init

drivers/s390/block/dasd_eckd.h

+6 −0
Original line number Diff line number Diff line
@@ -66,9 +66,15 @@ 
 * Perform Subsystem Function / Sub-Orders

 */

#define PSF_SUBORDER_QHA		 0x1C /* Query Host Access */

#define PSF_SUBORDER_PPRCEQ		 0x50 /* PPRC Extended Query */

#define PSF_SUBORDER_VSQ		 0x52 /* Volume Storage Query */

#define PSF_SUBORDER_LCQ		 0x53 /* Logical Configuration Query */



/*

 * PPRC Extended Query Scopes

 */

#define PPRCEQ_SCOPE_4			 0x04 /* Scope 4 for PPRC Extended Query */



/*

 * CUIR response condition codes

 */

drivers/s390/block/dasd_int.h

+32 −0
Original line number Diff line number Diff line
@@ -259,6 +259,37 @@ struct dasd_uid { 
	char vduit[33];

};



/*

 * PPRC Status data

 */

struct dasd_pprc_header {

	__u8 entries;		/* 0     Number of device entries */

	__u8 unused;		/* 1     unused */

	__u16 entry_length;	/* 2-3   Length of device entry */

	__u32 unused2;		/* 4-7   unused */

} __packed;



struct dasd_pprc_dev_info {

	__u8 state;		/* 0       Copy State */

	__u8 flags;		/* 1       Flags */

	__u8 reserved1[2];	/* 2-3     reserved */

	__u8 prim_lss;		/* 4       Primary device LSS */

	__u8 primary;		/* 5       Primary device address */

	__u8 sec_lss;		/* 6       Secondary device LSS */

	__u8 secondary;		/* 7       Secondary device address */

	__u16 pprc_id;		/* 8-9     Peer-to-Peer Remote Copy ID */

	__u8 reserved2[12];	/* 10-21   reserved */

	__u16 prim_cu_ssid;	/* 22-23   Pimary Control Unit SSID */

	__u8 reserved3[12];	/* 24-35   reserved */

	__u16 sec_cu_ssid;	/* 36-37   Secondary Control Unit SSID */

	__u8 reserved4[90];	/* 38-127  reserved */

} __packed;



struct dasd_pprc_data_sc4 {

	struct dasd_pprc_header header;

	struct dasd_pprc_dev_info dev_info[5];

} __packed;



/*

 * the struct dasd_discipline is

 * sth like a table of virtual functions, if you think of dasd_eckd
@@ -387,6 +418,7 @@ struct dasd_discipline { 
	struct dasd_ccw_req *(*ese_format)(struct dasd_device *,

					   struct dasd_ccw_req *, struct irb *);

	int (*ese_read)(struct dasd_ccw_req *, struct irb *);

	int (*pprc_status)(struct dasd_device *, struct	dasd_pprc_data_sc4 *);

};



extern struct dasd_discipline *dasd_diag_discipline_pointer;