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373 lines
9.1 KiB
373 lines
9.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* SCSI device handler infrastructure. |
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* |
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* Copyright IBM Corporation, 2007 |
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* Authors: |
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* Chandra Seetharaman <[email protected]> |
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* Mike Anderson <[email protected]> |
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*/ |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <scsi/scsi_dh.h> |
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#include "scsi_priv.h" |
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static DEFINE_SPINLOCK(list_lock); |
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static LIST_HEAD(scsi_dh_list); |
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struct scsi_dh_blist { |
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const char *vendor; |
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const char *model; |
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const char *driver; |
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}; |
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static const struct scsi_dh_blist scsi_dh_blist[] = { |
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{"DGC", "RAID", "emc" }, |
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{"DGC", "DISK", "emc" }, |
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{"DGC", "VRAID", "emc" }, |
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{"COMPAQ", "MSA1000 VOLUME", "hp_sw" }, |
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{"COMPAQ", "HSV110", "hp_sw" }, |
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{"HP", "HSV100", "hp_sw"}, |
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{"DEC", "HSG80", "hp_sw"}, |
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{"IBM", "1722", "rdac", }, |
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{"IBM", "1724", "rdac", }, |
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{"IBM", "1726", "rdac", }, |
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{"IBM", "1742", "rdac", }, |
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{"IBM", "1745", "rdac", }, |
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{"IBM", "1746", "rdac", }, |
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{"IBM", "1813", "rdac", }, |
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{"IBM", "1814", "rdac", }, |
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{"IBM", "1815", "rdac", }, |
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{"IBM", "1818", "rdac", }, |
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{"IBM", "3526", "rdac", }, |
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{"IBM", "3542", "rdac", }, |
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{"IBM", "3552", "rdac", }, |
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{"SGI", "TP9300", "rdac", }, |
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{"SGI", "TP9400", "rdac", }, |
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{"SGI", "TP9500", "rdac", }, |
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{"SGI", "TP9700", "rdac", }, |
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{"SGI", "IS", "rdac", }, |
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{"STK", "OPENstorage", "rdac", }, |
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{"STK", "FLEXLINE 380", "rdac", }, |
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{"STK", "BladeCtlr", "rdac", }, |
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{"SUN", "CSM", "rdac", }, |
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{"SUN", "LCSM100", "rdac", }, |
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{"SUN", "STK6580_6780", "rdac", }, |
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{"SUN", "SUN_6180", "rdac", }, |
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{"SUN", "ArrayStorage", "rdac", }, |
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{"DELL", "MD3", "rdac", }, |
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{"NETAPP", "INF-01-00", "rdac", }, |
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{"LSI", "INF-01-00", "rdac", }, |
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{"ENGENIO", "INF-01-00", "rdac", }, |
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{"LENOVO", "DE_Series", "rdac", }, |
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{"FUJITSU", "ETERNUS_AHB", "rdac", }, |
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{NULL, NULL, NULL }, |
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}; |
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static const char * |
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scsi_dh_find_driver(struct scsi_device *sdev) |
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{ |
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const struct scsi_dh_blist *b; |
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if (scsi_device_tpgs(sdev)) |
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return "alua"; |
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for (b = scsi_dh_blist; b->vendor; b++) { |
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if (!strncmp(sdev->vendor, b->vendor, strlen(b->vendor)) && |
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!strncmp(sdev->model, b->model, strlen(b->model))) { |
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return b->driver; |
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} |
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} |
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return NULL; |
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} |
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static struct scsi_device_handler *__scsi_dh_lookup(const char *name) |
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{ |
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struct scsi_device_handler *tmp, *found = NULL; |
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spin_lock(&list_lock); |
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list_for_each_entry(tmp, &scsi_dh_list, list) { |
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if (!strncmp(tmp->name, name, strlen(tmp->name))) { |
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found = tmp; |
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break; |
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} |
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} |
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spin_unlock(&list_lock); |
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return found; |
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} |
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static struct scsi_device_handler *scsi_dh_lookup(const char *name) |
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{ |
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struct scsi_device_handler *dh; |
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if (!name || strlen(name) == 0) |
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return NULL; |
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dh = __scsi_dh_lookup(name); |
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if (!dh) { |
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request_module("scsi_dh_%s", name); |
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dh = __scsi_dh_lookup(name); |
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} |
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return dh; |
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} |
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/* |
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* scsi_dh_handler_attach - Attach a device handler to a device |
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* @sdev - SCSI device the device handler should attach to |
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* @scsi_dh - The device handler to attach |
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*/ |
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static int scsi_dh_handler_attach(struct scsi_device *sdev, |
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struct scsi_device_handler *scsi_dh) |
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{ |
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int error, ret = 0; |
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if (!try_module_get(scsi_dh->module)) |
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return -EINVAL; |
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error = scsi_dh->attach(sdev); |
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if (error != SCSI_DH_OK) { |
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switch (error) { |
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case SCSI_DH_NOMEM: |
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ret = -ENOMEM; |
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break; |
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case SCSI_DH_RES_TEMP_UNAVAIL: |
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ret = -EAGAIN; |
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break; |
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case SCSI_DH_DEV_UNSUPP: |
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case SCSI_DH_NOSYS: |
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ret = -ENODEV; |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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if (ret != -ENODEV) |
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sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%d)\n", |
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scsi_dh->name, error); |
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module_put(scsi_dh->module); |
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} else |
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sdev->handler = scsi_dh; |
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return ret; |
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} |
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/* |
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* scsi_dh_handler_detach - Detach a device handler from a device |
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* @sdev - SCSI device the device handler should be detached from |
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*/ |
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static void scsi_dh_handler_detach(struct scsi_device *sdev) |
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{ |
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sdev->handler->detach(sdev); |
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sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", sdev->handler->name); |
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module_put(sdev->handler->module); |
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} |
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void scsi_dh_add_device(struct scsi_device *sdev) |
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{ |
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struct scsi_device_handler *devinfo = NULL; |
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const char *drv; |
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drv = scsi_dh_find_driver(sdev); |
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if (drv) |
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devinfo = __scsi_dh_lookup(drv); |
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/* |
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* device_handler is optional, so ignore errors |
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* from scsi_dh_handler_attach() |
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*/ |
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if (devinfo) |
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(void)scsi_dh_handler_attach(sdev, devinfo); |
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} |
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void scsi_dh_release_device(struct scsi_device *sdev) |
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{ |
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if (sdev->handler) |
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scsi_dh_handler_detach(sdev); |
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} |
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/* |
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* scsi_register_device_handler - register a device handler personality |
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* module. |
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* @scsi_dh - device handler to be registered. |
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* |
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* Returns 0 on success, -EBUSY if handler already registered. |
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*/ |
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int scsi_register_device_handler(struct scsi_device_handler *scsi_dh) |
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{ |
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if (__scsi_dh_lookup(scsi_dh->name)) |
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return -EBUSY; |
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if (!scsi_dh->attach || !scsi_dh->detach) |
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return -EINVAL; |
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spin_lock(&list_lock); |
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list_add(&scsi_dh->list, &scsi_dh_list); |
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spin_unlock(&list_lock); |
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printk(KERN_INFO "%s: device handler registered\n", scsi_dh->name); |
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return SCSI_DH_OK; |
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} |
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EXPORT_SYMBOL_GPL(scsi_register_device_handler); |
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/* |
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* scsi_unregister_device_handler - register a device handler personality |
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* module. |
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* @scsi_dh - device handler to be unregistered. |
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* |
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* Returns 0 on success, -ENODEV if handler not registered. |
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*/ |
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int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh) |
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{ |
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if (!__scsi_dh_lookup(scsi_dh->name)) |
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return -ENODEV; |
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spin_lock(&list_lock); |
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list_del(&scsi_dh->list); |
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spin_unlock(&list_lock); |
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printk(KERN_INFO "%s: device handler unregistered\n", scsi_dh->name); |
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return SCSI_DH_OK; |
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} |
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EXPORT_SYMBOL_GPL(scsi_unregister_device_handler); |
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/* |
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* scsi_dh_activate - activate the path associated with the scsi_device |
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* corresponding to the given request queue. |
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* Returns immediately without waiting for activation to be completed. |
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* @q - Request queue that is associated with the scsi_device to be |
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* activated. |
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* @fn - Function to be called upon completion of the activation. |
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* Function fn is called with data (below) and the error code. |
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* Function fn may be called from the same calling context. So, |
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* do not hold the lock in the caller which may be needed in fn. |
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* @data - data passed to the function fn upon completion. |
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* |
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*/ |
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int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data) |
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{ |
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struct scsi_device *sdev; |
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int err = SCSI_DH_NOSYS; |
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sdev = scsi_device_from_queue(q); |
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if (!sdev) { |
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if (fn) |
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fn(data, err); |
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return err; |
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} |
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if (!sdev->handler) |
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goto out_fn; |
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err = SCSI_DH_NOTCONN; |
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if (sdev->sdev_state == SDEV_CANCEL || |
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sdev->sdev_state == SDEV_DEL) |
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goto out_fn; |
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err = SCSI_DH_DEV_OFFLINED; |
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if (sdev->sdev_state == SDEV_OFFLINE) |
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goto out_fn; |
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if (sdev->handler->activate) |
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err = sdev->handler->activate(sdev, fn, data); |
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out_put_device: |
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put_device(&sdev->sdev_gendev); |
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return err; |
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out_fn: |
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if (fn) |
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fn(data, err); |
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goto out_put_device; |
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} |
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EXPORT_SYMBOL_GPL(scsi_dh_activate); |
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/* |
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* scsi_dh_set_params - set the parameters for the device as per the |
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* string specified in params. |
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* @q - Request queue that is associated with the scsi_device for |
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* which the parameters to be set. |
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* @params - parameters in the following format |
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* "no_of_params\0param1\0param2\0param3\0...\0" |
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* for example, string for 2 parameters with value 10 and 21 |
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* is specified as "2\010\021\0". |
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*/ |
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int scsi_dh_set_params(struct request_queue *q, const char *params) |
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{ |
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struct scsi_device *sdev; |
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int err = -SCSI_DH_NOSYS; |
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sdev = scsi_device_from_queue(q); |
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if (!sdev) |
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return err; |
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if (sdev->handler && sdev->handler->set_params) |
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err = sdev->handler->set_params(sdev, params); |
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put_device(&sdev->sdev_gendev); |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(scsi_dh_set_params); |
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/* |
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* scsi_dh_attach - Attach device handler |
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* @q - Request queue that is associated with the scsi_device |
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* the handler should be attached to |
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* @name - name of the handler to attach |
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*/ |
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int scsi_dh_attach(struct request_queue *q, const char *name) |
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{ |
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struct scsi_device *sdev; |
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struct scsi_device_handler *scsi_dh; |
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int err = 0; |
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sdev = scsi_device_from_queue(q); |
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if (!sdev) |
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return -ENODEV; |
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scsi_dh = scsi_dh_lookup(name); |
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if (!scsi_dh) { |
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err = -EINVAL; |
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goto out_put_device; |
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} |
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if (sdev->handler) { |
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if (sdev->handler != scsi_dh) |
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err = -EBUSY; |
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goto out_put_device; |
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} |
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err = scsi_dh_handler_attach(sdev, scsi_dh); |
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out_put_device: |
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put_device(&sdev->sdev_gendev); |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(scsi_dh_attach); |
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/* |
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* scsi_dh_attached_handler_name - Get attached device handler's name |
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* @q - Request queue that is associated with the scsi_device |
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* that may have a device handler attached |
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* @gfp - the GFP mask used in the kmalloc() call when allocating memory |
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* |
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* Returns name of attached handler, NULL if no handler is attached. |
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* Caller must take care to free the returned string. |
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*/ |
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const char *scsi_dh_attached_handler_name(struct request_queue *q, gfp_t gfp) |
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{ |
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struct scsi_device *sdev; |
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const char *handler_name = NULL; |
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sdev = scsi_device_from_queue(q); |
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if (!sdev) |
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return NULL; |
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if (sdev->handler) |
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handler_name = kstrdup(sdev->handler->name, gfp); |
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put_device(&sdev->sdev_gendev); |
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return handler_name; |
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} |
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EXPORT_SYMBOL_GPL(scsi_dh_attached_handler_name);
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