diff options
| -rw-r--r-- | drivers/scsi/device_handler/scsi_dh_hp_sw.c | 272 |
1 files changed, 234 insertions, 38 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c index 78259bc5dfc..9c7a1f8ebb7 100644 --- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c @@ -4,6 +4,7 @@ * * Copyright (C) 2006 Red Hat, Inc. All rights reserved. * Copyright (C) 2006 Mike Christie + * Copyright (C) 2008 Hannes Reinecke <hare@suse.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -25,13 +26,18 @@ #include <scsi/scsi_eh.h> #include <scsi/scsi_dh.h> -#define HP_SW_NAME "hp_sw" +#define HP_SW_NAME "hp_sw" -#define HP_SW_TIMEOUT (60 * HZ) -#define HP_SW_RETRIES 3 +#define HP_SW_TIMEOUT (60 * HZ) +#define HP_SW_RETRIES 3 + +#define HP_SW_PATH_UNINITIALIZED -1 +#define HP_SW_PATH_ACTIVE 0 +#define HP_SW_PATH_PASSIVE 1 struct hp_sw_dh_data { unsigned char sense[SCSI_SENSE_BUFFERSIZE]; + int path_state; int retries; }; @@ -42,51 +48,161 @@ static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev) return ((struct hp_sw_dh_data *) scsi_dh_data->buf); } -static int hp_sw_done(struct scsi_device *sdev) +/* + * tur_done - Handle TEST UNIT READY return status + * @sdev: sdev the command has been sent to + * @errors: blk error code + * + * Returns SCSI_DH_DEV_OFFLINED if the sdev is on the passive path + */ +static int tur_done(struct scsi_device *sdev, unsigned char *sense) { - struct hp_sw_dh_data *h = get_hp_sw_data(sdev); struct scsi_sense_hdr sshdr; - int rc; - - sdev_printk(KERN_INFO, sdev, "hp_sw_done\n"); + int ret; - rc = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE, &sshdr); - if (!rc) + ret = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr); + if (!ret) { + sdev_printk(KERN_WARNING, sdev, + "%s: sending tur failed, no sense available\n", + HP_SW_NAME); + ret = SCSI_DH_IO; goto done; + } switch (sshdr.sense_key) { + case UNIT_ATTENTION: + ret = SCSI_DH_IMM_RETRY; + break; case NOT_READY: - if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) { - rc = SCSI_DH_RETRY; - h->retries++; + if ((sshdr.asc == 0x04) && (sshdr.ascq == 2)) { + /* + * LUN not ready - Initialization command required + * + * This is the passive path + */ + ret = SCSI_DH_DEV_OFFLINED; break; } - /* fall through */ + /* Fallthrough */ default: - h->retries++; - rc = SCSI_DH_IMM_RETRY; + sdev_printk(KERN_WARNING, sdev, + "%s: sending tur failed, sense %x/%x/%x\n", + HP_SW_NAME, sshdr.sense_key, sshdr.asc, + sshdr.ascq); + break; } done: - if (rc == SCSI_DH_OK || rc == SCSI_DH_IO) - h->retries = 0; - else if (h->retries > HP_SW_RETRIES) { - h->retries = 0; + return ret; +} + +/* + * hp_sw_tur - Send TEST UNIT READY + * @sdev: sdev command should be sent to + * + * Use the TEST UNIT READY command to determine + * the path state. + */ +static int hp_sw_tur(struct scsi_device *sdev, struct hp_sw_dh_data *h) +{ + struct request *req; + int ret; + + req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); + if (!req) + return SCSI_DH_RES_TEMP_UNAVAIL; + + req->cmd_type = REQ_TYPE_BLOCK_PC; + req->cmd_flags |= REQ_FAILFAST; + req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY); + memset(req->cmd, 0, MAX_COMMAND_SIZE); + req->cmd[0] = TEST_UNIT_READY; + req->timeout = HP_SW_TIMEOUT; + req->sense = h->sense; + memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); + req->sense_len = 0; + +retry: + ret = blk_execute_rq(req->q, NULL, req, 1); + if (ret == -EIO) { + if (req->sense_len > 0) { + ret = tur_done(sdev, h->sense); + } else { + sdev_printk(KERN_WARNING, sdev, + "%s: sending tur failed with %x\n", + HP_SW_NAME, req->errors); + ret = SCSI_DH_IO; + } + } else { + h->path_state = HP_SW_PATH_ACTIVE; + ret = SCSI_DH_OK; + } + if (ret == SCSI_DH_IMM_RETRY) + goto retry; + if (ret == SCSI_DH_DEV_OFFLINED) { + h->path_state = HP_SW_PATH_PASSIVE; + ret = SCSI_DH_OK; + } + + blk_put_request(req); + + return ret; +} + +/* + * start_done - Handle START STOP UNIT return status + * @sdev: sdev the command has been sent to + * @errors: blk error code + */ +static int start_done(struct scsi_device *sdev, unsigned char *sense) +{ + struct scsi_sense_hdr sshdr; + int rc; + + rc = scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr); + if (!rc) { + sdev_printk(KERN_WARNING, sdev, + "%s: sending start_stop_unit failed, " + "no sense available\n", + HP_SW_NAME); + return SCSI_DH_IO; + } + switch (sshdr.sense_key) { + case NOT_READY: + if ((sshdr.asc == 0x04) && (sshdr.ascq == 3)) { + /* + * LUN not ready - manual intervention required + * + * Switch-over in progress, retry. + */ + rc = SCSI_DH_RETRY; + break; + } + /* fall through */ + default: + sdev_printk(KERN_WARNING, sdev, + "%s: sending start_stop_unit failed, sense %x/%x/%x\n", + HP_SW_NAME, sshdr.sense_key, sshdr.asc, + sshdr.ascq); rc = SCSI_DH_IO; } + return rc; } -static int hp_sw_activate(struct scsi_device *sdev) +/* + * hp_sw_start_stop - Send START STOP UNIT command + * @sdev: sdev command should be sent to + * + * Sending START STOP UNIT activates the SP. + */ +static int hp_sw_start_stop(struct scsi_device *sdev, struct hp_sw_dh_data *h) { - struct hp_sw_dh_data *h = get_hp_sw_data(sdev); struct request *req; - int ret = SCSI_DH_RES_TEMP_UNAVAIL; + int ret, retry; - req = blk_get_request(sdev->request_queue, WRITE, GFP_ATOMIC); + req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); if (!req) - goto done; - - sdev_printk(KERN_INFO, sdev, "sending START_STOP."); + return SCSI_DH_RES_TEMP_UNAVAIL; req->cmd_type = REQ_TYPE_BLOCK_PC; req->cmd_flags |= REQ_FAILFAST; @@ -98,19 +214,78 @@ static int hp_sw_activate(struct scsi_device *sdev) req->sense = h->sense; memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); req->sense_len = 0; + retry = h->retries; +retry: ret = blk_execute_rq(req->q, NULL, req, 1); - if (!ret) /* SUCCESS */ - ret = hp_sw_done(sdev); - else + if (ret == -EIO) { + if (req->sense_len > 0) { + ret = start_done(sdev, h->sense); + } else { + sdev_printk(KERN_WARNING, sdev, + "%s: sending start_stop_unit failed with %x\n", + HP_SW_NAME, req->errors); + ret = SCSI_DH_IO; + } + } else + ret = SCSI_DH_OK; + + if (ret == SCSI_DH_RETRY) { + if (--retry) + goto retry; ret = SCSI_DH_IO; -done: + } + + blk_put_request(req); + + return ret; +} + +static int hp_sw_prep_fn(struct scsi_device *sdev, struct request *req) +{ + struct hp_sw_dh_data *h = get_hp_sw_data(sdev); + int ret = BLKPREP_OK; + + if (h->path_state != HP_SW_PATH_ACTIVE) { + ret = BLKPREP_KILL; + req->cmd_flags |= REQ_QUIET; + } + return ret; + +} + +/* + * hp_sw_activate - Activate a path + * @sdev: sdev on the path to be activated + * + * The HP Active/Passive firmware is pretty simple; + * the passive path reports NOT READY with sense codes + * 0x04/0x02; a START STOP UNIT command will then + * activate the passive path (and deactivate the + * previously active one). + */ +static int hp_sw_activate(struct scsi_device *sdev) +{ + int ret = SCSI_DH_OK; + struct hp_sw_dh_data *h = get_hp_sw_data(sdev); + + ret = hp_sw_tur(sdev, h); + + if (ret == SCSI_DH_OK && h->path_state == HP_SW_PATH_PASSIVE) { + ret = hp_sw_start_stop(sdev, h); + if (ret == SCSI_DH_OK) + sdev_printk(KERN_INFO, sdev, + "%s: activated path\n", + HP_SW_NAME); + } + return ret; } const struct scsi_dh_devlist hp_sw_dh_data_list[] = { - {"COMPAQ", "MSA"}, - {"HP", "HSV"}, + {"COMPAQ", "MSA1000 VOLUME"}, + {"COMPAQ", "HSV110"}, + {"HP", "HSV100"}, {"DEC", "HSG80"}, {NULL, NULL}, }; @@ -125,30 +300,51 @@ static struct scsi_device_handler hp_sw_dh = { .attach = hp_sw_bus_attach, .detach = hp_sw_bus_detach, .activate = hp_sw_activate, + .prep_fn = hp_sw_prep_fn, }; static int hp_sw_bus_attach(struct scsi_device *sdev) { struct scsi_dh_data *scsi_dh_data; + struct hp_sw_dh_data *h; unsigned long flags; + int ret; scsi_dh_data = kzalloc(sizeof(struct scsi_device_handler *) + sizeof(struct hp_sw_dh_data) , GFP_KERNEL); if (!scsi_dh_data) { - sdev_printk(KERN_ERR, sdev, "Attach Failed %s.\n", + sdev_printk(KERN_ERR, sdev, "%s: Attach Failed\n", HP_SW_NAME); return 0; } scsi_dh_data->scsi_dh = &hp_sw_dh; + h = (struct hp_sw_dh_data *) scsi_dh_data->buf; + h->path_state = HP_SW_PATH_UNINITIALIZED; + h->retries = HP_SW_RETRIES; + + ret = hp_sw_tur(sdev, h); + if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED) + goto failed; + + if (!try_module_get(THIS_MODULE)) + goto failed; + spin_lock_irqsave(sdev->request_queue->queue_lock, flags); sdev->scsi_dh_data = scsi_dh_data; spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); - try_module_get(THIS_MODULE); - sdev_printk(KERN_NOTICE, sdev, "Attached %s.\n", HP_SW_NAME); + sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n", + HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE? + "active":"passive"); return 0; + +failed: + kfree(scsi_dh_data); + sdev_printk(KERN_ERR, sdev, "%s: not attached\n", + HP_SW_NAME); + return -EINVAL; } static void hp_sw_bus_detach( struct scsi_device *sdev ) @@ -162,7 +358,7 @@ static void hp_sw_bus_detach( struct scsi_device *sdev ) spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); module_put(THIS_MODULE); - sdev_printk(KERN_NOTICE, sdev, "Detached %s\n", HP_SW_NAME); + sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", HP_SW_NAME); kfree(scsi_dh_data); } @@ -180,6 +376,6 @@ static void __exit hp_sw_exit(void) module_init(hp_sw_init); module_exit(hp_sw_exit); -MODULE_DESCRIPTION("HP MSA 1000"); +MODULE_DESCRIPTION("HP Active/Passive driver"); MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu"); MODULE_LICENSE("GPL"); |