From: Stefan Haberland sth@linux.ibm.com
[ Upstream commit 3f217cceb6846e7533511fc69bc774cdba37ff7d ]
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: Stefan Haberland sth@linux.ibm.com Reviewed-by: Jan Hoeppner hoeppner@linux.ibm.com Link: https://lore.kernel.org/r/20220920192616.808070-3-sth@linux.ibm.com Signed-off-by: Jens Axboe axboe@kernel.dk Stable-dep-of: c3116e62ddef ("s390/dasd: fix double module refcount decrement") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/s390/block/dasd_eckd.c | 66 ++++++++++++++++++++++++++++++++++ drivers/s390/block/dasd_eckd.h | 6 ++++ drivers/s390/block/dasd_int.h | 32 +++++++++++++++++ 3 files changed, 104 insertions(+)
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index cf80db7a74a3d..76f861c2ce614 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -6105,6 +6105,71 @@ 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 */ @@ -6723,6 +6788,7 @@ 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 diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h index 65e4630ad2aea..ed83a9a55191b 100644 --- a/drivers/s390/block/dasd_eckd.h +++ b/drivers/s390/block/dasd_eckd.h @@ -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 */ diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index d94ae067f085e..2ee8bc035b34a 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -260,6 +260,37 @@ 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 @@ -388,6 +419,7 @@ 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;