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	Fixed MTP to work with TWRP
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					 50820 changed files with 20846062 additions and 0 deletions
				
			
		
							
								
								
									
										669
									
								
								drivers/s390/cio/device_pgid.c
									
										
									
									
									
										Normal file
									
								
							
							
						
						
									
										669
									
								
								drivers/s390/cio/device_pgid.c
									
										
									
									
									
										Normal file
									
								
							|  | @ -0,0 +1,669 @@ | |||
| /*
 | ||||
|  *  CCW device PGID and path verification I/O handling. | ||||
|  * | ||||
|  *    Copyright IBM Corp. 2002, 2009 | ||||
|  *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> | ||||
|  *		 Martin Schwidefsky <schwidefsky@de.ibm.com> | ||||
|  *		 Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | ||||
|  */ | ||||
| 
 | ||||
| #include <linux/kernel.h> | ||||
| #include <linux/string.h> | ||||
| #include <linux/types.h> | ||||
| #include <linux/errno.h> | ||||
| #include <linux/bitops.h> | ||||
| #include <asm/ccwdev.h> | ||||
| #include <asm/cio.h> | ||||
| 
 | ||||
| #include "cio.h" | ||||
| #include "cio_debug.h" | ||||
| #include "device.h" | ||||
| #include "io_sch.h" | ||||
| 
 | ||||
| #define PGID_RETRIES	256 | ||||
| #define PGID_TIMEOUT	(10 * HZ) | ||||
| 
 | ||||
| static void verify_start(struct ccw_device *cdev); | ||||
| 
 | ||||
| /*
 | ||||
|  * Process path verification data and report result. | ||||
|  */ | ||||
| static void verify_done(struct ccw_device *cdev, int rc) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_dev_id *id = &cdev->private->dev_id; | ||||
| 	int mpath = cdev->private->flags.mpath; | ||||
| 	int pgroup = cdev->private->flags.pgroup; | ||||
| 
 | ||||
| 	if (rc) | ||||
| 		goto out; | ||||
| 	/* Ensure consistent multipathing state at device and channel. */ | ||||
| 	if (sch->config.mp != mpath) { | ||||
| 		sch->config.mp = mpath; | ||||
| 		rc = cio_commit_config(sch); | ||||
| 	} | ||||
| out: | ||||
| 	CIO_MSG_EVENT(2, "vrfy: device 0.%x.%04x: rc=%d pgroup=%d mpath=%d " | ||||
| 			 "vpm=%02x\n", id->ssid, id->devno, rc, pgroup, mpath, | ||||
| 			 sch->vpm); | ||||
| 	ccw_device_verify_done(cdev, rc); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Create channel program to perform a NOOP. | ||||
|  */ | ||||
| static void nop_build_cp(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	struct ccw1 *cp = cdev->private->iccws; | ||||
| 
 | ||||
| 	cp->cmd_code	= CCW_CMD_NOOP; | ||||
| 	cp->cda		= 0; | ||||
| 	cp->count	= 0; | ||||
| 	cp->flags	= CCW_FLAG_SLI; | ||||
| 	req->cp		= cp; | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Perform NOOP on a single path. | ||||
|  */ | ||||
| static void nop_do(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 
 | ||||
| 	req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm & | ||||
| 			      ~cdev->private->path_noirq_mask); | ||||
| 	if (!req->lpm) | ||||
| 		goto out_nopath; | ||||
| 	nop_build_cp(cdev); | ||||
| 	ccw_request_start(cdev); | ||||
| 	return; | ||||
| 
 | ||||
| out_nopath: | ||||
| 	verify_done(cdev, sch->vpm ? 0 : -EACCES); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Adjust NOOP I/O status. | ||||
|  */ | ||||
| static enum io_status nop_filter(struct ccw_device *cdev, void *data, | ||||
| 				 struct irb *irb, enum io_status status) | ||||
| { | ||||
| 	/* Only subchannel status might indicate a path error. */ | ||||
| 	if (status == IO_STATUS_ERROR && irb->scsw.cmd.cstat == 0) | ||||
| 		return IO_DONE; | ||||
| 	return status; | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Process NOOP request result for a single path. | ||||
|  */ | ||||
| static void nop_callback(struct ccw_device *cdev, void *data, int rc) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 
 | ||||
| 	switch (rc) { | ||||
| 	case 0: | ||||
| 		sch->vpm |= req->lpm; | ||||
| 		break; | ||||
| 	case -ETIME: | ||||
| 		cdev->private->path_noirq_mask |= req->lpm; | ||||
| 		break; | ||||
| 	case -EACCES: | ||||
| 		cdev->private->path_notoper_mask |= req->lpm; | ||||
| 		break; | ||||
| 	default: | ||||
| 		goto err; | ||||
| 	} | ||||
| 	/* Continue on the next path. */ | ||||
| 	req->lpm >>= 1; | ||||
| 	nop_do(cdev); | ||||
| 	return; | ||||
| 
 | ||||
| err: | ||||
| 	verify_done(cdev, rc); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Create channel program to perform SET PGID on a single path. | ||||
|  */ | ||||
| static void spid_build_cp(struct ccw_device *cdev, u8 fn) | ||||
| { | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	struct ccw1 *cp = cdev->private->iccws; | ||||
| 	int i = 8 - ffs(req->lpm); | ||||
| 	struct pgid *pgid = &cdev->private->pgid[i]; | ||||
| 
 | ||||
| 	pgid->inf.fc	= fn; | ||||
| 	cp->cmd_code	= CCW_CMD_SET_PGID; | ||||
| 	cp->cda		= (u32) (addr_t) pgid; | ||||
| 	cp->count	= sizeof(*pgid); | ||||
| 	cp->flags	= CCW_FLAG_SLI; | ||||
| 	req->cp		= cp; | ||||
| } | ||||
| 
 | ||||
| static void pgid_wipeout_callback(struct ccw_device *cdev, void *data, int rc) | ||||
| { | ||||
| 	if (rc) { | ||||
| 		/* We don't know the path groups' state. Abort. */ | ||||
| 		verify_done(cdev, rc); | ||||
| 		return; | ||||
| 	} | ||||
| 	/*
 | ||||
| 	 * Path groups have been reset. Restart path verification but | ||||
| 	 * leave paths in path_noirq_mask out. | ||||
| 	 */ | ||||
| 	cdev->private->flags.pgid_unknown = 0; | ||||
| 	verify_start(cdev); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Reset pathgroups and restart path verification, leave unusable paths out. | ||||
|  */ | ||||
| static void pgid_wipeout_start(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_dev_id *id = &cdev->private->dev_id; | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	u8 fn; | ||||
| 
 | ||||
| 	CIO_MSG_EVENT(2, "wipe: device 0.%x.%04x: pvm=%02x nim=%02x\n", | ||||
| 		      id->ssid, id->devno, cdev->private->pgid_valid_mask, | ||||
| 		      cdev->private->path_noirq_mask); | ||||
| 
 | ||||
| 	/* Initialize request data. */ | ||||
| 	memset(req, 0, sizeof(*req)); | ||||
| 	req->timeout	= PGID_TIMEOUT; | ||||
| 	req->maxretries	= PGID_RETRIES; | ||||
| 	req->lpm	= sch->schib.pmcw.pam; | ||||
| 	req->callback	= pgid_wipeout_callback; | ||||
| 	fn = SPID_FUNC_DISBAND; | ||||
| 	if (cdev->private->flags.mpath) | ||||
| 		fn |= SPID_FUNC_MULTI_PATH; | ||||
| 	spid_build_cp(cdev, fn); | ||||
| 	ccw_request_start(cdev); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Perform establish/resign SET PGID on a single path. | ||||
|  */ | ||||
| static void spid_do(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	u8 fn; | ||||
| 
 | ||||
| 	/* Use next available path that is not already in correct state. */ | ||||
| 	req->lpm = lpm_adjust(req->lpm, cdev->private->pgid_todo_mask); | ||||
| 	if (!req->lpm) | ||||
| 		goto out_nopath; | ||||
| 	/* Channel program setup. */ | ||||
| 	if (req->lpm & sch->opm) | ||||
| 		fn = SPID_FUNC_ESTABLISH; | ||||
| 	else | ||||
| 		fn = SPID_FUNC_RESIGN; | ||||
| 	if (cdev->private->flags.mpath) | ||||
| 		fn |= SPID_FUNC_MULTI_PATH; | ||||
| 	spid_build_cp(cdev, fn); | ||||
| 	ccw_request_start(cdev); | ||||
| 	return; | ||||
| 
 | ||||
| out_nopath: | ||||
| 	if (cdev->private->flags.pgid_unknown) { | ||||
| 		/* At least one SPID could be partially done. */ | ||||
| 		pgid_wipeout_start(cdev); | ||||
| 		return; | ||||
| 	} | ||||
| 	verify_done(cdev, sch->vpm ? 0 : -EACCES); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Process SET PGID request result for a single path. | ||||
|  */ | ||||
| static void spid_callback(struct ccw_device *cdev, void *data, int rc) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 
 | ||||
| 	switch (rc) { | ||||
| 	case 0: | ||||
| 		sch->vpm |= req->lpm & sch->opm; | ||||
| 		break; | ||||
| 	case -ETIME: | ||||
| 		cdev->private->flags.pgid_unknown = 1; | ||||
| 		cdev->private->path_noirq_mask |= req->lpm; | ||||
| 		break; | ||||
| 	case -EACCES: | ||||
| 		cdev->private->path_notoper_mask |= req->lpm; | ||||
| 		break; | ||||
| 	case -EOPNOTSUPP: | ||||
| 		if (cdev->private->flags.mpath) { | ||||
| 			/* Try without multipathing. */ | ||||
| 			cdev->private->flags.mpath = 0; | ||||
| 			goto out_restart; | ||||
| 		} | ||||
| 		/* Try without pathgrouping. */ | ||||
| 		cdev->private->flags.pgroup = 0; | ||||
| 		goto out_restart; | ||||
| 	default: | ||||
| 		goto err; | ||||
| 	} | ||||
| 	req->lpm >>= 1; | ||||
| 	spid_do(cdev); | ||||
| 	return; | ||||
| 
 | ||||
| out_restart: | ||||
| 	verify_start(cdev); | ||||
| 	return; | ||||
| err: | ||||
| 	verify_done(cdev, rc); | ||||
| } | ||||
| 
 | ||||
| static void spid_start(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 
 | ||||
| 	/* Initialize request data. */ | ||||
| 	memset(req, 0, sizeof(*req)); | ||||
| 	req->timeout	= PGID_TIMEOUT; | ||||
| 	req->maxretries	= PGID_RETRIES; | ||||
| 	req->lpm	= 0x80; | ||||
| 	req->singlepath	= 1; | ||||
| 	req->callback	= spid_callback; | ||||
| 	spid_do(cdev); | ||||
| } | ||||
| 
 | ||||
| static int pgid_is_reset(struct pgid *p) | ||||
| { | ||||
| 	char *c; | ||||
| 
 | ||||
| 	for (c = (char *)p + 1; c < (char *)(p + 1); c++) { | ||||
| 		if (*c != 0) | ||||
| 			return 0; | ||||
| 	} | ||||
| 	return 1; | ||||
| } | ||||
| 
 | ||||
| static int pgid_cmp(struct pgid *p1, struct pgid *p2) | ||||
| { | ||||
| 	return memcmp((char *) p1 + 1, (char *) p2 + 1, | ||||
| 		      sizeof(struct pgid) - 1); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Determine pathgroup state from PGID data. | ||||
|  */ | ||||
| static void pgid_analyze(struct ccw_device *cdev, struct pgid **p, | ||||
| 			 int *mismatch, u8 *reserved, u8 *reset) | ||||
| { | ||||
| 	struct pgid *pgid = &cdev->private->pgid[0]; | ||||
| 	struct pgid *first = NULL; | ||||
| 	int lpm; | ||||
| 	int i; | ||||
| 
 | ||||
| 	*mismatch = 0; | ||||
| 	*reserved = 0; | ||||
| 	*reset = 0; | ||||
| 	for (i = 0, lpm = 0x80; i < 8; i++, pgid++, lpm >>= 1) { | ||||
| 		if ((cdev->private->pgid_valid_mask & lpm) == 0) | ||||
| 			continue; | ||||
| 		if (pgid->inf.ps.state2 == SNID_STATE2_RESVD_ELSE) | ||||
| 			*reserved |= lpm; | ||||
| 		if (pgid_is_reset(pgid)) { | ||||
| 			*reset |= lpm; | ||||
| 			continue; | ||||
| 		} | ||||
| 		if (!first) { | ||||
| 			first = pgid; | ||||
| 			continue; | ||||
| 		} | ||||
| 		if (pgid_cmp(pgid, first) != 0) | ||||
| 			*mismatch = 1; | ||||
| 	} | ||||
| 	if (!first) | ||||
| 		first = &channel_subsystems[0]->global_pgid; | ||||
| 	*p = first; | ||||
| } | ||||
| 
 | ||||
| static u8 pgid_to_donepm(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct pgid *pgid; | ||||
| 	int i; | ||||
| 	int lpm; | ||||
| 	u8 donepm = 0; | ||||
| 
 | ||||
| 	/* Set bits for paths which are already in the target state. */ | ||||
| 	for (i = 0; i < 8; i++) { | ||||
| 		lpm = 0x80 >> i; | ||||
| 		if ((cdev->private->pgid_valid_mask & lpm) == 0) | ||||
| 			continue; | ||||
| 		pgid = &cdev->private->pgid[i]; | ||||
| 		if (sch->opm & lpm) { | ||||
| 			if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED) | ||||
| 				continue; | ||||
| 		} else { | ||||
| 			if (pgid->inf.ps.state1 != SNID_STATE1_UNGROUPED) | ||||
| 				continue; | ||||
| 		} | ||||
| 		if (cdev->private->flags.mpath) { | ||||
| 			if (pgid->inf.ps.state3 != SNID_STATE3_MULTI_PATH) | ||||
| 				continue; | ||||
| 		} else { | ||||
| 			if (pgid->inf.ps.state3 != SNID_STATE3_SINGLE_PATH) | ||||
| 				continue; | ||||
| 		} | ||||
| 		donepm |= lpm; | ||||
| 	} | ||||
| 
 | ||||
| 	return donepm; | ||||
| } | ||||
| 
 | ||||
| static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid) | ||||
| { | ||||
| 	int i; | ||||
| 
 | ||||
| 	for (i = 0; i < 8; i++) | ||||
| 		memcpy(&cdev->private->pgid[i], pgid, sizeof(struct pgid)); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Process SENSE PGID data and report result. | ||||
|  */ | ||||
| static void snid_done(struct ccw_device *cdev, int rc) | ||||
| { | ||||
| 	struct ccw_dev_id *id = &cdev->private->dev_id; | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct pgid *pgid; | ||||
| 	int mismatch = 0; | ||||
| 	u8 reserved = 0; | ||||
| 	u8 reset = 0; | ||||
| 	u8 donepm; | ||||
| 
 | ||||
| 	if (rc) | ||||
| 		goto out; | ||||
| 	pgid_analyze(cdev, &pgid, &mismatch, &reserved, &reset); | ||||
| 	if (reserved == cdev->private->pgid_valid_mask) | ||||
| 		rc = -EUSERS; | ||||
| 	else if (mismatch) | ||||
| 		rc = -EOPNOTSUPP; | ||||
| 	else { | ||||
| 		donepm = pgid_to_donepm(cdev); | ||||
| 		sch->vpm = donepm & sch->opm; | ||||
| 		cdev->private->pgid_reset_mask |= reset; | ||||
| 		cdev->private->pgid_todo_mask &= | ||||
| 			~(donepm | cdev->private->path_noirq_mask); | ||||
| 		pgid_fill(cdev, pgid); | ||||
| 	} | ||||
| out: | ||||
| 	CIO_MSG_EVENT(2, "snid: device 0.%x.%04x: rc=%d pvm=%02x vpm=%02x " | ||||
| 		      "todo=%02x mism=%d rsvd=%02x reset=%02x\n", id->ssid, | ||||
| 		      id->devno, rc, cdev->private->pgid_valid_mask, sch->vpm, | ||||
| 		      cdev->private->pgid_todo_mask, mismatch, reserved, reset); | ||||
| 	switch (rc) { | ||||
| 	case 0: | ||||
| 		if (cdev->private->flags.pgid_unknown) { | ||||
| 			pgid_wipeout_start(cdev); | ||||
| 			return; | ||||
| 		} | ||||
| 		/* Anything left to do? */ | ||||
| 		if (cdev->private->pgid_todo_mask == 0) { | ||||
| 			verify_done(cdev, sch->vpm == 0 ? -EACCES : 0); | ||||
| 			return; | ||||
| 		} | ||||
| 		/* Perform path-grouping. */ | ||||
| 		spid_start(cdev); | ||||
| 		break; | ||||
| 	case -EOPNOTSUPP: | ||||
| 		/* Path-grouping not supported. */ | ||||
| 		cdev->private->flags.pgroup = 0; | ||||
| 		cdev->private->flags.mpath = 0; | ||||
| 		verify_start(cdev); | ||||
| 		break; | ||||
| 	default: | ||||
| 		verify_done(cdev, rc); | ||||
| 	} | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Create channel program to perform a SENSE PGID on a single path. | ||||
|  */ | ||||
| static void snid_build_cp(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	struct ccw1 *cp = cdev->private->iccws; | ||||
| 	int i = 8 - ffs(req->lpm); | ||||
| 
 | ||||
| 	/* Channel program setup. */ | ||||
| 	cp->cmd_code	= CCW_CMD_SENSE_PGID; | ||||
| 	cp->cda		= (u32) (addr_t) &cdev->private->pgid[i]; | ||||
| 	cp->count	= sizeof(struct pgid); | ||||
| 	cp->flags	= CCW_FLAG_SLI; | ||||
| 	req->cp		= cp; | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Perform SENSE PGID on a single path. | ||||
|  */ | ||||
| static void snid_do(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	int ret; | ||||
| 
 | ||||
| 	req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & | ||||
| 			      ~cdev->private->path_noirq_mask); | ||||
| 	if (!req->lpm) | ||||
| 		goto out_nopath; | ||||
| 	snid_build_cp(cdev); | ||||
| 	ccw_request_start(cdev); | ||||
| 	return; | ||||
| 
 | ||||
| out_nopath: | ||||
| 	if (cdev->private->pgid_valid_mask) | ||||
| 		ret = 0; | ||||
| 	else if (cdev->private->path_noirq_mask) | ||||
| 		ret = -ETIME; | ||||
| 	else | ||||
| 		ret = -EACCES; | ||||
| 	snid_done(cdev, ret); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Process SENSE PGID request result for single path. | ||||
|  */ | ||||
| static void snid_callback(struct ccw_device *cdev, void *data, int rc) | ||||
| { | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 
 | ||||
| 	switch (rc) { | ||||
| 	case 0: | ||||
| 		cdev->private->pgid_valid_mask |= req->lpm; | ||||
| 		break; | ||||
| 	case -ETIME: | ||||
| 		cdev->private->flags.pgid_unknown = 1; | ||||
| 		cdev->private->path_noirq_mask |= req->lpm; | ||||
| 		break; | ||||
| 	case -EACCES: | ||||
| 		cdev->private->path_notoper_mask |= req->lpm; | ||||
| 		break; | ||||
| 	default: | ||||
| 		goto err; | ||||
| 	} | ||||
| 	/* Continue on the next path. */ | ||||
| 	req->lpm >>= 1; | ||||
| 	snid_do(cdev); | ||||
| 	return; | ||||
| 
 | ||||
| err: | ||||
| 	snid_done(cdev, rc); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Perform path verification. | ||||
|  */ | ||||
| static void verify_start(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	struct ccw_dev_id *devid = &cdev->private->dev_id; | ||||
| 
 | ||||
| 	sch->vpm = 0; | ||||
| 	sch->lpm = sch->schib.pmcw.pam; | ||||
| 
 | ||||
| 	/* Initialize PGID data. */ | ||||
| 	memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid)); | ||||
| 	cdev->private->pgid_valid_mask = 0; | ||||
| 	cdev->private->pgid_todo_mask = sch->schib.pmcw.pam; | ||||
| 	cdev->private->path_notoper_mask = 0; | ||||
| 
 | ||||
| 	/* Initialize request data. */ | ||||
| 	memset(req, 0, sizeof(*req)); | ||||
| 	req->timeout	= PGID_TIMEOUT; | ||||
| 	req->maxretries	= PGID_RETRIES; | ||||
| 	req->lpm	= 0x80; | ||||
| 	req->singlepath	= 1; | ||||
| 	if (cdev->private->flags.pgroup) { | ||||
| 		CIO_TRACE_EVENT(4, "snid"); | ||||
| 		CIO_HEX_EVENT(4, devid, sizeof(*devid)); | ||||
| 		req->callback	= snid_callback; | ||||
| 		snid_do(cdev); | ||||
| 	} else { | ||||
| 		CIO_TRACE_EVENT(4, "nop"); | ||||
| 		CIO_HEX_EVENT(4, devid, sizeof(*devid)); | ||||
| 		req->filter	= nop_filter; | ||||
| 		req->callback	= nop_callback; | ||||
| 		nop_do(cdev); | ||||
| 	} | ||||
| } | ||||
| 
 | ||||
| /**
 | ||||
|  * ccw_device_verify_start - perform path verification | ||||
|  * @cdev: ccw device | ||||
|  * | ||||
|  * Perform an I/O on each available channel path to @cdev to determine which | ||||
|  * paths are operational. The resulting path mask is stored in sch->vpm. | ||||
|  * If device options specify pathgrouping, establish a pathgroup for the | ||||
|  * operational paths. When finished, call ccw_device_verify_done with a | ||||
|  * return code specifying the result. | ||||
|  */ | ||||
| void ccw_device_verify_start(struct ccw_device *cdev) | ||||
| { | ||||
| 	CIO_TRACE_EVENT(4, "vrfy"); | ||||
| 	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); | ||||
| 	/*
 | ||||
| 	 * Initialize pathgroup and multipath state with target values. | ||||
| 	 * They may change in the course of path verification. | ||||
| 	 */ | ||||
| 	cdev->private->flags.pgroup = cdev->private->options.pgroup; | ||||
| 	cdev->private->flags.mpath = cdev->private->options.mpath; | ||||
| 	cdev->private->flags.doverify = 0; | ||||
| 	cdev->private->path_noirq_mask = 0; | ||||
| 	verify_start(cdev); | ||||
| } | ||||
| 
 | ||||
| /*
 | ||||
|  * Process disband SET PGID request result. | ||||
|  */ | ||||
| static void disband_callback(struct ccw_device *cdev, void *data, int rc) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_dev_id *id = &cdev->private->dev_id; | ||||
| 
 | ||||
| 	if (rc) | ||||
| 		goto out; | ||||
| 	/* Ensure consistent multipathing state at device and channel. */ | ||||
| 	cdev->private->flags.mpath = 0; | ||||
| 	if (sch->config.mp) { | ||||
| 		sch->config.mp = 0; | ||||
| 		rc = cio_commit_config(sch); | ||||
| 	} | ||||
| out: | ||||
| 	CIO_MSG_EVENT(0, "disb: device 0.%x.%04x: rc=%d\n", id->ssid, id->devno, | ||||
| 		      rc); | ||||
| 	ccw_device_disband_done(cdev, rc); | ||||
| } | ||||
| 
 | ||||
| /**
 | ||||
|  * ccw_device_disband_start - disband pathgroup | ||||
|  * @cdev: ccw device | ||||
|  * | ||||
|  * Execute a SET PGID channel program on @cdev to disband a previously | ||||
|  * established pathgroup. When finished, call ccw_device_disband_done with | ||||
|  * a return code specifying the result. | ||||
|  */ | ||||
| void ccw_device_disband_start(struct ccw_device *cdev) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	u8 fn; | ||||
| 
 | ||||
| 	CIO_TRACE_EVENT(4, "disb"); | ||||
| 	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); | ||||
| 	/* Request setup. */ | ||||
| 	memset(req, 0, sizeof(*req)); | ||||
| 	req->timeout	= PGID_TIMEOUT; | ||||
| 	req->maxretries	= PGID_RETRIES; | ||||
| 	req->lpm	= sch->schib.pmcw.pam & sch->opm; | ||||
| 	req->singlepath	= 1; | ||||
| 	req->callback	= disband_callback; | ||||
| 	fn = SPID_FUNC_DISBAND; | ||||
| 	if (cdev->private->flags.mpath) | ||||
| 		fn |= SPID_FUNC_MULTI_PATH; | ||||
| 	spid_build_cp(cdev, fn); | ||||
| 	ccw_request_start(cdev); | ||||
| } | ||||
| 
 | ||||
| static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2) | ||||
| { | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 	struct ccw1 *cp = cdev->private->iccws; | ||||
| 
 | ||||
| 	cp[0].cmd_code = CCW_CMD_STLCK; | ||||
| 	cp[0].cda = (u32) (addr_t) buf1; | ||||
| 	cp[0].count = 32; | ||||
| 	cp[0].flags = CCW_FLAG_CC; | ||||
| 	cp[1].cmd_code = CCW_CMD_RELEASE; | ||||
| 	cp[1].cda = (u32) (addr_t) buf2; | ||||
| 	cp[1].count = 32; | ||||
| 	cp[1].flags = 0; | ||||
| 	req->cp = cp; | ||||
| } | ||||
| 
 | ||||
| static void stlck_callback(struct ccw_device *cdev, void *data, int rc) | ||||
| { | ||||
| 	ccw_device_stlck_done(cdev, data, rc); | ||||
| } | ||||
| 
 | ||||
| /**
 | ||||
|  * ccw_device_stlck_start - perform unconditional release | ||||
|  * @cdev: ccw device | ||||
|  * @data: data pointer to be passed to ccw_device_stlck_done | ||||
|  * @buf1: data pointer used in channel program | ||||
|  * @buf2: data pointer used in channel program | ||||
|  * | ||||
|  * Execute a channel program on @cdev to release an existing PGID reservation. | ||||
|  * When finished, call ccw_device_stlck_done with a return code specifying the | ||||
|  * result. | ||||
|  */ | ||||
| void ccw_device_stlck_start(struct ccw_device *cdev, void *data, void *buf1, | ||||
| 			    void *buf2) | ||||
| { | ||||
| 	struct subchannel *sch = to_subchannel(cdev->dev.parent); | ||||
| 	struct ccw_request *req = &cdev->private->req; | ||||
| 
 | ||||
| 	CIO_TRACE_EVENT(4, "stlck"); | ||||
| 	CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); | ||||
| 	/* Request setup. */ | ||||
| 	memset(req, 0, sizeof(*req)); | ||||
| 	req->timeout	= PGID_TIMEOUT; | ||||
| 	req->maxretries	= PGID_RETRIES; | ||||
| 	req->lpm	= sch->schib.pmcw.pam & sch->opm; | ||||
| 	req->data	= data; | ||||
| 	req->callback	= stlck_callback; | ||||
| 	stlck_build_cp(cdev, buf1, buf2); | ||||
| 	ccw_request_start(cdev); | ||||
| } | ||||
| 
 | ||||
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