From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/scsi/device_handler/scsi_dh_hp_sw.c | 400 ++++++++++++++++++++++++++++ 1 file changed, 400 insertions(+) create mode 100644 drivers/scsi/device_handler/scsi_dh_hp_sw.c (limited to 'drivers/scsi/device_handler/scsi_dh_hp_sw.c') diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c new file mode 100644 index 000000000..485d99544 --- /dev/null +++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c @@ -0,0 +1,400 @@ +/* + * Basic HP/COMPAQ MSA 1000 support. This is only needed if your HW cannot be + * upgraded. + * + * Copyright (C) 2006 Red Hat, Inc. All rights reserved. + * Copyright (C) 2006 Mike Christie + * Copyright (C) 2008 Hannes Reinecke + * + * 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 + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include +#include +#include +#include +#include +#include + +#define HP_SW_NAME "hp_sw" + +#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 { + struct scsi_dh_data dh_data; + unsigned char sense[SCSI_SENSE_BUFFERSIZE]; + int path_state; + int retries; + int retry_cnt; + struct scsi_device *sdev; + activate_complete callback_fn; + void *callback_data; +}; + +static int hp_sw_start_stop(struct hp_sw_dh_data *); + +static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev) +{ + return container_of(sdev->scsi_dh_data, struct hp_sw_dh_data, dh_data); +} + +/* + * 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 scsi_sense_hdr sshdr; + int ret; + + 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 == 2)) { + /* + * LUN not ready - Initialization command required + * + * This is the passive path + */ + ret = SCSI_DH_DEV_OFFLINED; + break; + } + /* Fallthrough */ + default: + 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: + 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; + +retry: + req = blk_get_request(sdev->request_queue, WRITE, GFP_NOIO); + if (IS_ERR(req)) + return SCSI_DH_RES_TEMP_UNAVAIL; + + blk_rq_set_block_pc(req); + req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | + REQ_FAILFAST_DRIVER; + req->cmd_len = COMMAND_SIZE(TEST_UNIT_READY); + 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; + + 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) { + blk_put_request(req); + 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 void start_stop_endio(struct request *req, int error) +{ + struct hp_sw_dh_data *h = req->end_io_data; + unsigned err = SCSI_DH_OK; + + if (error || host_byte(req->errors) != DID_OK || + msg_byte(req->errors) != COMMAND_COMPLETE) { + sdev_printk(KERN_WARNING, h->sdev, + "%s: sending start_stop_unit failed with %x\n", + HP_SW_NAME, req->errors); + err = SCSI_DH_IO; + goto done; + } + + if (req->sense_len > 0) { + err = start_done(h->sdev, h->sense); + if (err == SCSI_DH_RETRY) { + err = SCSI_DH_IO; + if (--h->retry_cnt) { + blk_put_request(req); + err = hp_sw_start_stop(h); + if (err == SCSI_DH_OK) + return; + } + } + } +done: + req->end_io_data = NULL; + __blk_put_request(req->q, req); + if (h->callback_fn) { + h->callback_fn(h->callback_data, err); + h->callback_fn = h->callback_data = NULL; + } + return; + +} + +/* + * 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 hp_sw_dh_data *h) +{ + struct request *req; + + req = blk_get_request(h->sdev->request_queue, WRITE, GFP_ATOMIC); + if (IS_ERR(req)) + return SCSI_DH_RES_TEMP_UNAVAIL; + + blk_rq_set_block_pc(req); + req->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | + REQ_FAILFAST_DRIVER; + req->cmd_len = COMMAND_SIZE(START_STOP); + req->cmd[0] = START_STOP; + req->cmd[4] = 1; /* Start spin cycle */ + req->timeout = HP_SW_TIMEOUT; + req->sense = h->sense; + memset(req->sense, 0, SCSI_SENSE_BUFFERSIZE); + req->sense_len = 0; + req->end_io_data = h; + + blk_execute_rq_nowait(req->q, NULL, req, 1, start_stop_endio); + return SCSI_DH_OK; +} + +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, + activate_complete fn, void *data) +{ + 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) { + h->retry_cnt = h->retries; + h->callback_fn = fn; + h->callback_data = data; + ret = hp_sw_start_stop(h); + if (ret == SCSI_DH_OK) + return 0; + h->callback_fn = h->callback_data = NULL; + } + + if (fn) + fn(data, ret); + return 0; +} + +static const struct { + char *vendor; + char *model; +} hp_sw_dh_data_list[] = { + {"COMPAQ", "MSA1000 VOLUME"}, + {"COMPAQ", "HSV110"}, + {"HP", "HSV100"}, + {"DEC", "HSG80"}, + {NULL, NULL}, +}; + +static bool hp_sw_match(struct scsi_device *sdev) +{ + int i; + + if (scsi_device_tpgs(sdev)) + return false; + + for (i = 0; hp_sw_dh_data_list[i].vendor; i++) { + if (!strncmp(sdev->vendor, hp_sw_dh_data_list[i].vendor, + strlen(hp_sw_dh_data_list[i].vendor)) && + !strncmp(sdev->model, hp_sw_dh_data_list[i].model, + strlen(hp_sw_dh_data_list[i].model))) { + return true; + } + } + return false; +} + +static struct scsi_dh_data *hp_sw_bus_attach(struct scsi_device *sdev) +{ + struct hp_sw_dh_data *h; + int ret; + + h = kzalloc(sizeof(*h), GFP_KERNEL); + if (!h) + return ERR_PTR(-ENOMEM); + h->path_state = HP_SW_PATH_UNINITIALIZED; + h->retries = HP_SW_RETRIES; + h->sdev = sdev; + + ret = hp_sw_tur(sdev, h); + if (ret != SCSI_DH_OK || h->path_state == HP_SW_PATH_UNINITIALIZED) + goto failed; + + sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n", + HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE? + "active":"passive"); + return &h->dh_data; +failed: + kfree(h); + return ERR_PTR(-EINVAL); +} + +static void hp_sw_bus_detach( struct scsi_device *sdev ) +{ + struct hp_sw_dh_data *h = get_hp_sw_data(sdev); + + kfree(h); +} + +static struct scsi_device_handler hp_sw_dh = { + .name = HP_SW_NAME, + .module = THIS_MODULE, + .attach = hp_sw_bus_attach, + .detach = hp_sw_bus_detach, + .activate = hp_sw_activate, + .prep_fn = hp_sw_prep_fn, + .match = hp_sw_match, +}; + +static int __init hp_sw_init(void) +{ + return scsi_register_device_handler(&hp_sw_dh); +} + +static void __exit hp_sw_exit(void) +{ + scsi_unregister_device_handler(&hp_sw_dh); +} + +module_init(hp_sw_init); +module_exit(hp_sw_exit); + +MODULE_DESCRIPTION("HP Active/Passive driver"); +MODULE_AUTHOR("Mike Christie