| /* |
| * scsi_scan.c |
| * |
| * Copyright (C) 2000 Eric Youngdale, |
| * Copyright (C) 2002 Patrick Mansfield |
| * |
| * The general scanning/probing algorithm is as follows, exceptions are |
| * made to it depending on device specific flags, compilation options, and |
| * global variable (boot or module load time) settings. |
| * |
| * A specific LUN is scanned via an INQUIRY command; if the LUN has a |
| * device attached, a scsi_device is allocated and setup for it. |
| * |
| * For every id of every channel on the given host: |
| * |
| * Scan LUN 0; if the target responds to LUN 0 (even if there is no |
| * device or storage attached to LUN 0): |
| * |
| * If LUN 0 has a device attached, allocate and setup a |
| * scsi_device for it. |
| * |
| * If target is SCSI-3 or up, issue a REPORT LUN, and scan |
| * all of the LUNs returned by the REPORT LUN; else, |
| * sequentially scan LUNs up until some maximum is reached, |
| * or a LUN is seen that cannot have a device attached to it. |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/init.h> |
| #include <linux/blkdev.h> |
| #include <asm/semaphore.h> |
| |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_driver.h> |
| #include <scsi/scsi_devinfo.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_request.h> |
| #include <scsi/scsi_transport.h> |
| #include <scsi/scsi_eh.h> |
| |
| #include "scsi_priv.h" |
| #include "scsi_logging.h" |
| |
| #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ |
| " SCSI scanning, some SCSI devices might not be configured\n" |
| |
| /* |
| * Default timeout |
| */ |
| #define SCSI_TIMEOUT (2*HZ) |
| |
| /* |
| * Prefix values for the SCSI id's (stored in driverfs name field) |
| */ |
| #define SCSI_UID_SER_NUM 'S' |
| #define SCSI_UID_UNKNOWN 'Z' |
| |
| /* |
| * Return values of some of the scanning functions. |
| * |
| * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this |
| * includes allocation or general failures preventing IO from being sent. |
| * |
| * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available |
| * on the given LUN. |
| * |
| * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a |
| * given LUN. |
| */ |
| #define SCSI_SCAN_NO_RESPONSE 0 |
| #define SCSI_SCAN_TARGET_PRESENT 1 |
| #define SCSI_SCAN_LUN_PRESENT 2 |
| |
| static char *scsi_null_device_strs = "nullnullnullnull"; |
| |
| #define MAX_SCSI_LUNS 512 |
| |
| #ifdef CONFIG_SCSI_MULTI_LUN |
| static unsigned int max_scsi_luns = MAX_SCSI_LUNS; |
| #else |
| static unsigned int max_scsi_luns = 1; |
| #endif |
| |
| module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(max_luns, |
| "last scsi LUN (should be between 1 and 2^32-1)"); |
| |
| /* |
| * max_scsi_report_luns: the maximum number of LUNS that will be |
| * returned from the REPORT LUNS command. 8 times this value must |
| * be allocated. In theory this could be up to an 8 byte value, but |
| * in practice, the maximum number of LUNs suppored by any device |
| * is about 16k. |
| */ |
| static unsigned int max_scsi_report_luns = 511; |
| |
| module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(max_report_luns, |
| "REPORT LUNS maximum number of LUNS received (should be" |
| " between 1 and 16384)"); |
| |
| static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; |
| |
| module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR); |
| MODULE_PARM_DESC(inq_timeout, |
| "Timeout (in seconds) waiting for devices to answer INQUIRY." |
| " Default is 5. Some non-compliant devices need more."); |
| |
| /** |
| * scsi_unlock_floptical - unlock device via a special MODE SENSE command |
| * @sdev: scsi device to send command to |
| * @result: area to store the result of the MODE SENSE |
| * |
| * Description: |
| * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
| * Called for BLIST_KEY devices. |
| **/ |
| static void scsi_unlock_floptical(struct scsi_device *sdev, |
| unsigned char *result) |
| { |
| unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| |
| printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); |
| scsi_cmd[0] = MODE_SENSE; |
| scsi_cmd[1] = 0; |
| scsi_cmd[2] = 0x2e; |
| scsi_cmd[3] = 0; |
| scsi_cmd[4] = 0x2a; /* size */ |
| scsi_cmd[5] = 0; |
| scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
| SCSI_TIMEOUT, 3); |
| } |
| |
| /** |
| * print_inquiry - printk the inquiry information |
| * @inq_result: printk this SCSI INQUIRY |
| * |
| * Description: |
| * printk the vendor, model, and other information found in the |
| * INQUIRY data in @inq_result. |
| * |
| * Notes: |
| * Remove this, and replace with a hotplug event that logs any |
| * relevant information. |
| **/ |
| static void print_inquiry(unsigned char *inq_result) |
| { |
| int i; |
| |
| printk(KERN_NOTICE " Vendor: "); |
| for (i = 8; i < 16; i++) |
| if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) |
| printk("%c", inq_result[i]); |
| else |
| printk(" "); |
| |
| printk(" Model: "); |
| for (i = 16; i < 32; i++) |
| if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) |
| printk("%c", inq_result[i]); |
| else |
| printk(" "); |
| |
| printk(" Rev: "); |
| for (i = 32; i < 36; i++) |
| if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) |
| printk("%c", inq_result[i]); |
| else |
| printk(" "); |
| |
| printk("\n"); |
| |
| i = inq_result[0] & 0x1f; |
| |
| printk(KERN_NOTICE " Type: %s ", |
| i < |
| MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] : |
| "Unknown "); |
| printk(" ANSI SCSI revision: %02x", |
| inq_result[2] & 0x07); |
| if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1) |
| printk(" CCS\n"); |
| else |
| printk("\n"); |
| } |
| |
| /** |
| * scsi_alloc_sdev - allocate and setup a scsi_Device |
| * |
| * Description: |
| * Allocate, initialize for io, and return a pointer to a scsi_Device. |
| * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and |
| * adds scsi_Device to the appropriate list. |
| * |
| * Return value: |
| * scsi_Device pointer, or NULL on failure. |
| **/ |
| static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, |
| unsigned int lun, void *hostdata) |
| { |
| struct scsi_device *sdev; |
| int display_failure_msg = 1, ret; |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| |
| sdev = kmalloc(sizeof(*sdev) + shost->transportt->device_size, |
| GFP_ATOMIC); |
| if (!sdev) |
| goto out; |
| |
| memset(sdev, 0, sizeof(*sdev)); |
| sdev->vendor = scsi_null_device_strs; |
| sdev->model = scsi_null_device_strs; |
| sdev->rev = scsi_null_device_strs; |
| sdev->host = shost; |
| sdev->id = starget->id; |
| sdev->lun = lun; |
| sdev->channel = starget->channel; |
| sdev->sdev_state = SDEV_CREATED; |
| INIT_LIST_HEAD(&sdev->siblings); |
| INIT_LIST_HEAD(&sdev->same_target_siblings); |
| INIT_LIST_HEAD(&sdev->cmd_list); |
| INIT_LIST_HEAD(&sdev->starved_entry); |
| spin_lock_init(&sdev->list_lock); |
| |
| sdev->sdev_gendev.parent = get_device(&starget->dev); |
| sdev->sdev_target = starget; |
| |
| /* usually NULL and set by ->slave_alloc instead */ |
| sdev->hostdata = hostdata; |
| |
| /* if the device needs this changing, it may do so in the |
| * slave_configure function */ |
| sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; |
| |
| /* |
| * Some low level driver could use device->type |
| */ |
| sdev->type = -1; |
| |
| /* |
| * Assume that the device will have handshaking problems, |
| * and then fix this field later if it turns out it |
| * doesn't |
| */ |
| sdev->borken = 1; |
| |
| sdev->request_queue = scsi_alloc_queue(sdev); |
| if (!sdev->request_queue) { |
| /* release fn is set up in scsi_sysfs_device_initialise, so |
| * have to free and put manually here */ |
| put_device(&starget->dev); |
| goto out; |
| } |
| |
| sdev->request_queue->queuedata = sdev; |
| scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); |
| |
| scsi_sysfs_device_initialize(sdev); |
| |
| if (shost->hostt->slave_alloc) { |
| ret = shost->hostt->slave_alloc(sdev); |
| if (ret) { |
| /* |
| * if LLDD reports slave not present, don't clutter |
| * console with alloc failure messages |
| */ |
| if (ret == -ENXIO) |
| display_failure_msg = 0; |
| goto out_device_destroy; |
| } |
| } |
| |
| return sdev; |
| |
| out_device_destroy: |
| transport_destroy_device(&sdev->sdev_gendev); |
| put_device(&sdev->sdev_gendev); |
| out: |
| if (display_failure_msg) |
| printk(ALLOC_FAILURE_MSG, __FUNCTION__); |
| return NULL; |
| } |
| |
| static void scsi_target_dev_release(struct device *dev) |
| { |
| struct device *parent = dev->parent; |
| struct scsi_target *starget = to_scsi_target(dev); |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| |
| if (shost->hostt->target_destroy) |
| shost->hostt->target_destroy(starget); |
| kfree(starget); |
| put_device(parent); |
| } |
| |
| int scsi_is_target_device(const struct device *dev) |
| { |
| return dev->release == scsi_target_dev_release; |
| } |
| EXPORT_SYMBOL(scsi_is_target_device); |
| |
| static struct scsi_target *__scsi_find_target(struct device *parent, |
| int channel, uint id) |
| { |
| struct scsi_target *starget, *found_starget = NULL; |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| /* |
| * Search for an existing target for this sdev. |
| */ |
| list_for_each_entry(starget, &shost->__targets, siblings) { |
| if (starget->id == id && |
| starget->channel == channel) { |
| found_starget = starget; |
| break; |
| } |
| } |
| if (found_starget) |
| get_device(&found_starget->dev); |
| |
| return found_starget; |
| } |
| |
| static struct scsi_target *scsi_alloc_target(struct device *parent, |
| int channel, uint id) |
| { |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| struct device *dev = NULL; |
| unsigned long flags; |
| const int size = sizeof(struct scsi_target) |
| + shost->transportt->target_size; |
| struct scsi_target *starget; |
| struct scsi_target *found_target; |
| |
| /* |
| * Obtain the real parent from the transport. The transport |
| * is allowed to fail (no error) if there is nothing at that |
| * target id. |
| */ |
| if (shost->transportt->target_parent) { |
| spin_lock_irqsave(shost->host_lock, flags); |
| parent = shost->transportt->target_parent(shost, channel, id); |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| if (!parent) |
| return NULL; |
| } |
| |
| starget = kmalloc(size, GFP_KERNEL); |
| if (!starget) { |
| printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__); |
| return NULL; |
| } |
| memset(starget, 0, size); |
| dev = &starget->dev; |
| device_initialize(dev); |
| starget->reap_ref = 1; |
| dev->parent = get_device(parent); |
| dev->release = scsi_target_dev_release; |
| sprintf(dev->bus_id, "target%d:%d:%d", |
| shost->host_no, channel, id); |
| starget->id = id; |
| starget->channel = channel; |
| INIT_LIST_HEAD(&starget->siblings); |
| INIT_LIST_HEAD(&starget->devices); |
| spin_lock_irqsave(shost->host_lock, flags); |
| |
| found_target = __scsi_find_target(parent, channel, id); |
| if (found_target) |
| goto found; |
| |
| list_add_tail(&starget->siblings, &shost->__targets); |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| /* allocate and add */ |
| transport_setup_device(dev); |
| device_add(dev); |
| transport_add_device(dev); |
| if (shost->hostt->target_alloc) { |
| int error = shost->hostt->target_alloc(starget); |
| |
| if(error) { |
| dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); |
| /* don't want scsi_target_reap to do the final |
| * put because it will be under the host lock */ |
| get_device(dev); |
| scsi_target_reap(starget); |
| put_device(dev); |
| return NULL; |
| } |
| } |
| |
| return starget; |
| |
| found: |
| found_target->reap_ref++; |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| put_device(parent); |
| kfree(starget); |
| return found_target; |
| } |
| |
| struct work_queue_wrapper { |
| struct work_struct work; |
| struct scsi_target *starget; |
| }; |
| |
| static void scsi_target_reap_work(void *data) { |
| struct work_queue_wrapper *wqw = (struct work_queue_wrapper *)data; |
| struct scsi_target *starget = wqw->starget; |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| unsigned long flags; |
| |
| kfree(wqw); |
| |
| spin_lock_irqsave(shost->host_lock, flags); |
| |
| if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { |
| list_del_init(&starget->siblings); |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| device_del(&starget->dev); |
| transport_unregister_device(&starget->dev); |
| put_device(&starget->dev); |
| return; |
| |
| } |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| |
| return; |
| } |
| |
| /** |
| * scsi_target_reap - check to see if target is in use and destroy if not |
| * |
| * @starget: target to be checked |
| * |
| * This is used after removing a LUN or doing a last put of the target |
| * it checks atomically that nothing is using the target and removes |
| * it if so. |
| */ |
| void scsi_target_reap(struct scsi_target *starget) |
| { |
| struct work_queue_wrapper *wqw = |
| kzalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); |
| |
| if (!wqw) { |
| starget_printk(KERN_ERR, starget, |
| "Failed to allocate memory in scsi_reap_target()\n"); |
| return; |
| } |
| |
| INIT_WORK(&wqw->work, scsi_target_reap_work, wqw); |
| wqw->starget = starget; |
| schedule_work(&wqw->work); |
| } |
| |
| /** |
| * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY |
| * @sdev: scsi_device to probe |
| * @inq_result: area to store the INQUIRY result |
| * @result_len: len of inq_result |
| * @bflags: store any bflags found here |
| * |
| * Description: |
| * Probe the lun associated with @req using a standard SCSI INQUIRY; |
| * |
| * If the INQUIRY is successful, zero is returned and the |
| * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
| * are copied to the scsi_device any flags value is stored in *@bflags. |
| **/ |
| static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result, |
| int result_len, int *bflags) |
| { |
| unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| int first_inquiry_len, try_inquiry_len, next_inquiry_len; |
| int response_len = 0; |
| int pass, count, result; |
| struct scsi_sense_hdr sshdr; |
| |
| *bflags = 0; |
| |
| /* Perform up to 3 passes. The first pass uses a conservative |
| * transfer length of 36 unless sdev->inquiry_len specifies a |
| * different value. */ |
| first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; |
| try_inquiry_len = first_inquiry_len; |
| pass = 1; |
| |
| next_pass: |
| SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
| "scsi scan: INQUIRY pass %d length %d\n", |
| pass, try_inquiry_len)); |
| |
| /* Each pass gets up to three chances to ignore Unit Attention */ |
| for (count = 0; count < 3; ++count) { |
| memset(scsi_cmd, 0, 6); |
| scsi_cmd[0] = INQUIRY; |
| scsi_cmd[4] = (unsigned char) try_inquiry_len; |
| |
| memset(inq_result, 0, try_inquiry_len); |
| |
| result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
| inq_result, try_inquiry_len, &sshdr, |
| HZ / 2 + HZ * scsi_inq_timeout, 3); |
| |
| SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " |
| "with code 0x%x\n", |
| result ? "failed" : "successful", result)); |
| |
| if (result) { |
| /* |
| * not-ready to ready transition [asc/ascq=0x28/0x0] |
| * or power-on, reset [asc/ascq=0x29/0x0], continue. |
| * INQUIRY should not yield UNIT_ATTENTION |
| * but many buggy devices do so anyway. |
| */ |
| if ((driver_byte(result) & DRIVER_SENSE) && |
| scsi_sense_valid(&sshdr)) { |
| if ((sshdr.sense_key == UNIT_ATTENTION) && |
| ((sshdr.asc == 0x28) || |
| (sshdr.asc == 0x29)) && |
| (sshdr.ascq == 0)) |
| continue; |
| } |
| } |
| break; |
| } |
| |
| if (result == 0) { |
| response_len = (unsigned char) inq_result[4] + 5; |
| if (response_len > 255) |
| response_len = first_inquiry_len; /* sanity */ |
| |
| /* |
| * Get any flags for this device. |
| * |
| * XXX add a bflags to scsi_device, and replace the |
| * corresponding bit fields in scsi_device, so bflags |
| * need not be passed as an argument. |
| */ |
| *bflags = scsi_get_device_flags(sdev, &inq_result[8], |
| &inq_result[16]); |
| |
| /* When the first pass succeeds we gain information about |
| * what larger transfer lengths might work. */ |
| if (pass == 1) { |
| if (BLIST_INQUIRY_36 & *bflags) |
| next_inquiry_len = 36; |
| else if (BLIST_INQUIRY_58 & *bflags) |
| next_inquiry_len = 58; |
| else if (sdev->inquiry_len) |
| next_inquiry_len = sdev->inquiry_len; |
| else |
| next_inquiry_len = response_len; |
| |
| /* If more data is available perform the second pass */ |
| if (next_inquiry_len > try_inquiry_len) { |
| try_inquiry_len = next_inquiry_len; |
| pass = 2; |
| goto next_pass; |
| } |
| } |
| |
| } else if (pass == 2) { |
| printk(KERN_INFO "scsi scan: %d byte inquiry failed. " |
| "Consider BLIST_INQUIRY_36 for this device\n", |
| try_inquiry_len); |
| |
| /* If this pass failed, the third pass goes back and transfers |
| * the same amount as we successfully got in the first pass. */ |
| try_inquiry_len = first_inquiry_len; |
| pass = 3; |
| goto next_pass; |
| } |
| |
| /* If the last transfer attempt got an error, assume the |
| * peripheral doesn't exist or is dead. */ |
| if (result) |
| return -EIO; |
| |
| /* Don't report any more data than the device says is valid */ |
| sdev->inquiry_len = min(try_inquiry_len, response_len); |
| |
| /* |
| * XXX Abort if the response length is less than 36? If less than |
| * 32, the lookup of the device flags (above) could be invalid, |
| * and it would be possible to take an incorrect action - we do |
| * not want to hang because of a short INQUIRY. On the flip side, |
| * if the device is spun down or becoming ready (and so it gives a |
| * short INQUIRY), an abort here prevents any further use of the |
| * device, including spin up. |
| * |
| * Related to the above issue: |
| * |
| * XXX Devices (disk or all?) should be sent a TEST UNIT READY, |
| * and if not ready, sent a START_STOP to start (maybe spin up) and |
| * then send the INQUIRY again, since the INQUIRY can change after |
| * a device is initialized. |
| * |
| * Ideally, start a device if explicitly asked to do so. This |
| * assumes that a device is spun up on power on, spun down on |
| * request, and then spun up on request. |
| */ |
| |
| /* |
| * The scanning code needs to know the scsi_level, even if no |
| * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so |
| * non-zero LUNs can be scanned. |
| */ |
| sdev->scsi_level = inq_result[2] & 0x07; |
| if (sdev->scsi_level >= 2 || |
| (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) |
| sdev->scsi_level++; |
| sdev->sdev_target->scsi_level = sdev->scsi_level; |
| |
| return 0; |
| } |
| |
| /** |
| * scsi_add_lun - allocate and fully initialze a scsi_device |
| * @sdevscan: holds information to be stored in the new scsi_device |
| * @sdevnew: store the address of the newly allocated scsi_device |
| * @inq_result: holds the result of a previous INQUIRY to the LUN |
| * @bflags: black/white list flag |
| * |
| * Description: |
| * Allocate and initialize a scsi_device matching sdevscan. Optionally |
| * set fields based on values in *@bflags. If @sdevnew is not |
| * NULL, store the address of the new scsi_device in *@sdevnew (needed |
| * when scanning a particular LUN). |
| * |
| * Return: |
| * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
| * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
| **/ |
| static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags) |
| { |
| /* |
| * XXX do not save the inquiry, since it can change underneath us, |
| * save just vendor/model/rev. |
| * |
| * Rather than save it and have an ioctl that retrieves the saved |
| * value, have an ioctl that executes the same INQUIRY code used |
| * in scsi_probe_lun, let user level programs doing INQUIRY |
| * scanning run at their own risk, or supply a user level program |
| * that can correctly scan. |
| */ |
| sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC); |
| if (sdev->inquiry == NULL) { |
| return SCSI_SCAN_NO_RESPONSE; |
| } |
| |
| memcpy(sdev->inquiry, inq_result, sdev->inquiry_len); |
| sdev->vendor = (char *) (sdev->inquiry + 8); |
| sdev->model = (char *) (sdev->inquiry + 16); |
| sdev->rev = (char *) (sdev->inquiry + 32); |
| |
| if (*bflags & BLIST_ISROM) { |
| /* |
| * It would be better to modify sdev->type, and set |
| * sdev->removable, but then the print_inquiry() output |
| * would not show TYPE_ROM; if print_inquiry() is removed |
| * the issue goes away. |
| */ |
| inq_result[0] = TYPE_ROM; |
| inq_result[1] |= 0x80; /* removable */ |
| } else if (*bflags & BLIST_NO_ULD_ATTACH) |
| sdev->no_uld_attach = 1; |
| |
| switch (sdev->type = (inq_result[0] & 0x1f)) { |
| case TYPE_TAPE: |
| case TYPE_DISK: |
| case TYPE_PRINTER: |
| case TYPE_MOD: |
| case TYPE_PROCESSOR: |
| case TYPE_SCANNER: |
| case TYPE_MEDIUM_CHANGER: |
| case TYPE_ENCLOSURE: |
| case TYPE_COMM: |
| case TYPE_RBC: |
| sdev->writeable = 1; |
| break; |
| case TYPE_WORM: |
| case TYPE_ROM: |
| sdev->writeable = 0; |
| break; |
| default: |
| printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); |
| } |
| |
| print_inquiry(inq_result); |
| |
| /* |
| * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI |
| * spec says: The device server is capable of supporting the |
| * specified peripheral device type on this logical unit. However, |
| * the physical device is not currently connected to this logical |
| * unit. |
| * |
| * The above is vague, as it implies that we could treat 001 and |
| * 011 the same. Stay compatible with previous code, and create a |
| * scsi_device for a PQ of 1 |
| * |
| * Don't set the device offline here; rather let the upper |
| * level drivers eval the PQ to decide whether they should |
| * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. |
| */ |
| |
| sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; |
| sdev->removable = (0x80 & inq_result[1]) >> 7; |
| sdev->lockable = sdev->removable; |
| sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); |
| |
| if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 && |
| inq_result[56] & 0x04)) |
| sdev->ppr = 1; |
| if (inq_result[7] & 0x60) |
| sdev->wdtr = 1; |
| if (inq_result[7] & 0x10) |
| sdev->sdtr = 1; |
| |
| sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d", |
| sdev->host->host_no, sdev->channel, |
| sdev->id, sdev->lun); |
| |
| /* |
| * End driverfs/devfs code. |
| */ |
| |
| if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
| !(*bflags & BLIST_NOTQ)) |
| sdev->tagged_supported = 1; |
| /* |
| * Some devices (Texel CD ROM drives) have handshaking problems |
| * when used with the Seagate controllers. borken is initialized |
| * to 1, and then set it to 0 here. |
| */ |
| if ((*bflags & BLIST_BORKEN) == 0) |
| sdev->borken = 0; |
| |
| /* |
| * Apparently some really broken devices (contrary to the SCSI |
| * standards) need to be selected without asserting ATN |
| */ |
| if (*bflags & BLIST_SELECT_NO_ATN) |
| sdev->select_no_atn = 1; |
| |
| /* |
| * Some devices may not want to have a start command automatically |
| * issued when a device is added. |
| */ |
| if (*bflags & BLIST_NOSTARTONADD) |
| sdev->no_start_on_add = 1; |
| |
| if (*bflags & BLIST_SINGLELUN) |
| sdev->single_lun = 1; |
| |
| |
| sdev->use_10_for_rw = 1; |
| |
| if (*bflags & BLIST_MS_SKIP_PAGE_08) |
| sdev->skip_ms_page_8 = 1; |
| |
| if (*bflags & BLIST_MS_SKIP_PAGE_3F) |
| sdev->skip_ms_page_3f = 1; |
| |
| if (*bflags & BLIST_USE_10_BYTE_MS) |
| sdev->use_10_for_ms = 1; |
| |
| /* set the device running here so that slave configure |
| * may do I/O */ |
| scsi_device_set_state(sdev, SDEV_RUNNING); |
| |
| if (*bflags & BLIST_MS_192_BYTES_FOR_3F) |
| sdev->use_192_bytes_for_3f = 1; |
| |
| if (*bflags & BLIST_NOT_LOCKABLE) |
| sdev->lockable = 0; |
| |
| if (*bflags & BLIST_RETRY_HWERROR) |
| sdev->retry_hwerror = 1; |
| |
| transport_configure_device(&sdev->sdev_gendev); |
| |
| if (sdev->host->hostt->slave_configure) |
| sdev->host->hostt->slave_configure(sdev); |
| |
| /* |
| * Ok, the device is now all set up, we can |
| * register it and tell the rest of the kernel |
| * about it. |
| */ |
| if (scsi_sysfs_add_sdev(sdev) != 0) |
| return SCSI_SCAN_NO_RESPONSE; |
| |
| return SCSI_SCAN_LUN_PRESENT; |
| } |
| |
| static inline void scsi_destroy_sdev(struct scsi_device *sdev) |
| { |
| if (sdev->host->hostt->slave_destroy) |
| sdev->host->hostt->slave_destroy(sdev); |
| transport_destroy_device(&sdev->sdev_gendev); |
| put_device(&sdev->sdev_gendev); |
| } |
| |
| |
| /** |
| * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it |
| * @starget: pointer to target device structure |
| * @lun: LUN of target device |
| * @sdevscan: probe the LUN corresponding to this scsi_device |
| * @sdevnew: store the value of any new scsi_device allocated |
| * @bflagsp: store bflags here if not NULL |
| * |
| * Description: |
| * Call scsi_probe_lun, if a LUN with an attached device is found, |
| * allocate and set it up by calling scsi_add_lun. |
| * |
| * Return: |
| * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
| * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
| * attached at the LUN |
| * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
| **/ |
| static int scsi_probe_and_add_lun(struct scsi_target *starget, |
| uint lun, int *bflagsp, |
| struct scsi_device **sdevp, int rescan, |
| void *hostdata) |
| { |
| struct scsi_device *sdev; |
| unsigned char *result; |
| int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| |
| /* |
| * The rescan flag is used as an optimization, the first scan of a |
| * host adapter calls into here with rescan == 0. |
| */ |
| sdev = scsi_device_lookup_by_target(starget, lun); |
| if (sdev) { |
| if (rescan || sdev->sdev_state != SDEV_CREATED) { |
| SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
| "scsi scan: device exists on %s\n", |
| sdev->sdev_gendev.bus_id)); |
| if (sdevp) |
| *sdevp = sdev; |
| else |
| scsi_device_put(sdev); |
| |
| if (bflagsp) |
| *bflagsp = scsi_get_device_flags(sdev, |
| sdev->vendor, |
| sdev->model); |
| return SCSI_SCAN_LUN_PRESENT; |
| } |
| scsi_device_put(sdev); |
| } else |
| sdev = scsi_alloc_sdev(starget, lun, hostdata); |
| if (!sdev) |
| goto out; |
| |
| result = kmalloc(result_len, GFP_ATOMIC | |
| ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
| if (!result) |
| goto out_free_sdev; |
| |
| if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
| goto out_free_result; |
| |
| /* |
| * result contains valid SCSI INQUIRY data. |
| */ |
| if ((result[0] >> 5) == 3) { |
| /* |
| * For a Peripheral qualifier 3 (011b), the SCSI |
| * spec says: The device server is not capable of |
| * supporting a physical device on this logical |
| * unit. |
| * |
| * For disks, this implies that there is no |
| * logical disk configured at sdev->lun, but there |
| * is a target id responding. |
| */ |
| SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
| "scsi scan: peripheral qualifier of 3," |
| " no device added\n")); |
| res = SCSI_SCAN_TARGET_PRESENT; |
| goto out_free_result; |
| } |
| |
| res = scsi_add_lun(sdev, result, &bflags); |
| if (res == SCSI_SCAN_LUN_PRESENT) { |
| if (bflags & BLIST_KEY) { |
| sdev->lockable = 0; |
| scsi_unlock_floptical(sdev, result); |
| } |
| if (bflagsp) |
| *bflagsp = bflags; |
| } |
| |
| out_free_result: |
| kfree(result); |
| out_free_sdev: |
| if (res == SCSI_SCAN_LUN_PRESENT) { |
| if (sdevp) { |
| if (scsi_device_get(sdev) == 0) { |
| *sdevp = sdev; |
| } else { |
| __scsi_remove_device(sdev); |
| res = SCSI_SCAN_NO_RESPONSE; |
| } |
| } |
| } else |
| scsi_destroy_sdev(sdev); |
| out: |
| return res; |
| } |
| |
| /** |
| * scsi_sequential_lun_scan - sequentially scan a SCSI target |
| * @starget: pointer to target structure to scan |
| * @bflags: black/white list flag for LUN 0 |
| * @lun0_res: result of scanning LUN 0 |
| * |
| * Description: |
| * Generally, scan from LUN 1 (LUN 0 is assumed to already have been |
| * scanned) to some maximum lun until a LUN is found with no device |
| * attached. Use the bflags to figure out any oddities. |
| * |
| * Modifies sdevscan->lun. |
| **/ |
| static void scsi_sequential_lun_scan(struct scsi_target *starget, |
| int bflags, int lun0_res, int scsi_level, |
| int rescan) |
| { |
| unsigned int sparse_lun, lun, max_dev_lun; |
| struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| |
| SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" |
| "%s\n", starget->dev.bus_id)); |
| |
| max_dev_lun = min(max_scsi_luns, shost->max_lun); |
| /* |
| * If this device is known to support sparse multiple units, |
| * override the other settings, and scan all of them. Normally, |
| * SCSI-3 devices should be scanned via the REPORT LUNS. |
| */ |
| if (bflags & BLIST_SPARSELUN) { |
| max_dev_lun = shost->max_lun; |
| sparse_lun = 1; |
| } else |
| sparse_lun = 0; |
| |
| /* |
| * If not sparse lun and no device attached at LUN 0 do not scan |
| * any further. |
| */ |
| if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT)) |
| return; |
| |
| /* |
| * If less than SCSI_1_CSS, and no special lun scaning, stop |
| * scanning; this matches 2.4 behaviour, but could just be a bug |
| * (to continue scanning a SCSI_1_CSS device). |
| * |
| * This test is broken. We might not have any device on lun0 for |
| * a sparselun device, and if that's the case then how would we |
| * know the real scsi_level, eh? It might make sense to just not |
| * scan any SCSI_1 device for non-0 luns, but that check would best |
| * go into scsi_alloc_sdev() and just have it return null when asked |
| * to alloc an sdev for lun > 0 on an already found SCSI_1 device. |
| * |
| if ((sdevscan->scsi_level < SCSI_1_CCS) && |
| ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) |
| == 0)) |
| return; |
| */ |
| /* |
| * If this device is known to support multiple units, override |
| * the other settings, and scan all of them. |
| */ |
| if (bflags & BLIST_FORCELUN) |
| max_dev_lun = shost->max_lun; |
| /* |
| * REGAL CDC-4X: avoid hang after LUN 4 |
| */ |
| if (bflags & BLIST_MAX5LUN) |
| max_dev_lun = min(5U, max_dev_lun); |
| /* |
| * Do not scan SCSI-2 or lower device past LUN 7, unless |
| * BLIST_LARGELUN. |
| */ |
| if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) |
| max_dev_lun = min(8U, max_dev_lun); |
| |
| /* |
| * We have already scanned LUN 0, so start at LUN 1. Keep scanning |
| * until we reach the max, or no LUN is found and we are not |
| * sparse_lun. |
| */ |
| for (lun = 1; lun < max_dev_lun; ++lun) |
| if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, |
| NULL) != SCSI_SCAN_LUN_PRESENT) && |
| !sparse_lun) |
| return; |
| } |
| |
| /** |
| * scsilun_to_int: convert a scsi_lun to an int |
| * @scsilun: struct scsi_lun to be converted. |
| * |
| * Description: |
| * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered |
| * integer, and return the result. The caller must check for |
| * truncation before using this function. |
| * |
| * Notes: |
| * The struct scsi_lun is assumed to be four levels, with each level |
| * effectively containing a SCSI byte-ordered (big endian) short; the |
| * addressing bits of each level are ignored (the highest two bits). |
| * For a description of the LUN format, post SCSI-3 see the SCSI |
| * Architecture Model, for SCSI-3 see the SCSI Controller Commands. |
| * |
| * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns |
| * the integer: 0x0b030a04 |
| **/ |
| static int scsilun_to_int(struct scsi_lun *scsilun) |
| { |
| int i; |
| unsigned int lun; |
| |
| lun = 0; |
| for (i = 0; i < sizeof(lun); i += 2) |
| lun = lun | (((scsilun->scsi_lun[i] << 8) | |
| scsilun->scsi_lun[i + 1]) << (i * 8)); |
| return lun; |
| } |
| |
| /** |
| * int_to_scsilun: reverts an int into a scsi_lun |
| * @int: integer to be reverted |
| * @scsilun: struct scsi_lun to be set. |
| * |
| * Description: |
| * Reverts the functionality of the scsilun_to_int, which packed |
| * an 8-byte lun value into an int. This routine unpacks the int |
| * back into the lun value. |
| * Note: the scsilun_to_int() routine does not truly handle all |
| * 8bytes of the lun value. This functions restores only as much |
| * as was set by the routine. |
| * |
| * Notes: |
| * Given an integer : 0x0b030a04, this function returns a |
| * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 |
| * |
| **/ |
| void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) |
| { |
| int i; |
| |
| memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); |
| |
| for (i = 0; i < sizeof(lun); i += 2) { |
| scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; |
| scsilun->scsi_lun[i+1] = lun & 0xFF; |
| lun = lun >> 16; |
| } |
| } |
| EXPORT_SYMBOL(int_to_scsilun); |
| |
| /** |
| * scsi_report_lun_scan - Scan using SCSI REPORT LUN results |
| * @sdevscan: scan the host, channel, and id of this scsi_device |
| * |
| * Description: |
| * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN |
| * command, and scan the resulting list of LUNs by calling |
| * scsi_probe_and_add_lun. |
| * |
| * Modifies sdevscan->lun. |
| * |
| * Return: |
| * 0: scan completed (or no memory, so further scanning is futile) |
| * 1: no report lun scan, or not configured |
| **/ |
| static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
| int rescan) |
| { |
| char devname[64]; |
| unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| unsigned int length; |
| unsigned int lun; |
| unsigned int num_luns; |
| unsigned int retries; |
| int result; |
| struct scsi_lun *lunp, *lun_data; |
| u8 *data; |
| struct scsi_sense_hdr sshdr; |
| struct scsi_device *sdev; |
| struct Scsi_Host *shost = dev_to_shost(&starget->dev); |
| int ret = 0; |
| |
| /* |
| * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. |
| * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does |
| * support more than 8 LUNs. |
| */ |
| if ((bflags & BLIST_NOREPORTLUN) || |
| starget->scsi_level < SCSI_2 || |
| (starget->scsi_level < SCSI_3 && |
| (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) ) |
| return 1; |
| if (bflags & BLIST_NOLUN) |
| return 0; |
| |
| if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
| sdev = scsi_alloc_sdev(starget, 0, NULL); |
| if (!sdev) |
| return 0; |
| if (scsi_device_get(sdev)) |
| return 0; |
| } |
| |
| sprintf(devname, "host %d channel %d id %d", |
| shost->host_no, sdev->channel, sdev->id); |
| |
| /* |
| * Allocate enough to hold the header (the same size as one scsi_lun) |
| * plus the max number of luns we are requesting. |
| * |
| * Reallocating and trying again (with the exact amount we need) |
| * would be nice, but then we need to somehow limit the size |
| * allocated based on the available memory and the limits of |
| * kmalloc - we don't want a kmalloc() failure of a huge value to |
| * prevent us from finding any LUNs on this target. |
| */ |
| length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); |
| lun_data = kmalloc(length, GFP_ATOMIC | |
| (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); |
| if (!lun_data) { |
| printk(ALLOC_FAILURE_MSG, __FUNCTION__); |
| goto out; |
| } |
| |
| scsi_cmd[0] = REPORT_LUNS; |
| |
| /* |
| * bytes 1 - 5: reserved, set to zero. |
| */ |
| memset(&scsi_cmd[1], 0, 5); |
| |
| /* |
| * bytes 6 - 9: length of the command. |
| */ |
| scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; |
| scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; |
| scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; |
| scsi_cmd[9] = (unsigned char) length & 0xff; |
| |
| scsi_cmd[10] = 0; /* reserved */ |
| scsi_cmd[11] = 0; /* control */ |
| |
| /* |
| * We can get a UNIT ATTENTION, for example a power on/reset, so |
| * retry a few times (like sd.c does for TEST UNIT READY). |
| * Experience shows some combinations of adapter/devices get at |
| * least two power on/resets. |
| * |
| * Illegal requests (for devices that do not support REPORT LUNS) |
| * should come through as a check condition, and will not generate |
| * a retry. |
| */ |
| for (retries = 0; retries < 3; retries++) { |
| SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" |
| " REPORT LUNS to %s (try %d)\n", devname, |
| retries)); |
| |
| result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
| lun_data, length, &sshdr, |
| SCSI_TIMEOUT + 4 * HZ, 3); |
| |
| SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
| " %s (try %d) result 0x%x\n", result |
| ? "failed" : "successful", retries, result)); |
| if (result == 0) |
| break; |
| else if (scsi_sense_valid(&sshdr)) { |
| if (sshdr.sense_key != UNIT_ATTENTION) |
| break; |
| } |
| } |
| |
| if (result) { |
| /* |
| * The device probably does not support a REPORT LUN command |
| */ |
| ret = 1; |
| goto out_err; |
| } |
| |
| /* |
| * Get the length from the first four bytes of lun_data. |
| */ |
| data = (u8 *) lun_data->scsi_lun; |
| length = ((data[0] << 24) | (data[1] << 16) | |
| (data[2] << 8) | (data[3] << 0)); |
| |
| num_luns = (length / sizeof(struct scsi_lun)); |
| if (num_luns > max_scsi_report_luns) { |
| printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" |
| " of %d luns reported, try increasing" |
| " max_scsi_report_luns.\n", devname, |
| max_scsi_report_luns, num_luns); |
| num_luns = max_scsi_report_luns; |
| } |
| |
| SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
| "scsi scan: REPORT LUN scan\n")); |
| |
| /* |
| * Scan the luns in lun_data. The entry at offset 0 is really |
| * the header, so start at 1 and go up to and including num_luns. |
| */ |
| for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { |
| lun = scsilun_to_int(lunp); |
| |
| /* |
| * Check if the unused part of lunp is non-zero, and so |
| * does not fit in lun. |
| */ |
| if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { |
| int i; |
| |
| /* |
| * Output an error displaying the LUN in byte order, |
| * this differs from what linux would print for the |
| * integer LUN value. |
| */ |
| printk(KERN_WARNING "scsi: %s lun 0x", devname); |
| data = (char *)lunp->scsi_lun; |
| for (i = 0; i < sizeof(struct scsi_lun); i++) |
| printk("%02x", data[i]); |
| printk(" has a LUN larger than currently supported.\n"); |
| } else if (lun > sdev->host->max_lun) { |
| printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" |
| " than allowed by the host adapter\n", |
| devname, lun); |
| } else { |
| int res; |
| |
| res = scsi_probe_and_add_lun(starget, |
| lun, NULL, NULL, rescan, NULL); |
| if (res == SCSI_SCAN_NO_RESPONSE) { |
| /* |
| * Got some results, but now none, abort. |
| */ |
| sdev_printk(KERN_ERR, sdev, |
| "Unexpected response" |
| " from lun %d while scanning, scan" |
| " aborted\n", lun); |
| break; |
| } |
| } |
| } |
| |
| out_err: |
| kfree(lun_data); |
| out: |
| scsi_device_put(sdev); |
| if (sdev->sdev_state == SDEV_CREATED) |
| /* |
| * the sdev we used didn't appear in the report luns scan |
| */ |
| scsi_destroy_sdev(sdev); |
| return ret; |
| } |
| |
| struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, |
| uint id, uint lun, void *hostdata) |
| { |
| struct scsi_device *sdev; |
| struct device *parent = &shost->shost_gendev; |
| int res; |
| struct scsi_target *starget = scsi_alloc_target(parent, channel, id); |
| |
| if (!starget) |
| return ERR_PTR(-ENOMEM); |
| |
| get_device(&starget->dev); |
| down(&shost->scan_mutex); |
| if (scsi_host_scan_allowed(shost)) { |
| res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, |
| hostdata); |
| if (res != SCSI_SCAN_LUN_PRESENT) |
| sdev = ERR_PTR(-ENODEV); |
| } |
| up(&shost->scan_mutex); |
| scsi_target_reap(starget); |
| put_device(&starget->dev); |
| |
| return sdev; |
| } |
| EXPORT_SYMBOL(__scsi_add_device); |
| |
| int scsi_add_device(struct Scsi_Host *host, uint channel, |
| uint target, uint lun) |
| { |
| struct scsi_device *sdev = |
| __scsi_add_device(host, channel, target, lun, NULL); |
| if (IS_ERR(sdev)) |
| return PTR_ERR(sdev); |
| |
| scsi_device_put(sdev); |
| return 0; |
| } |
| EXPORT_SYMBOL(scsi_add_device); |
| |
| void scsi_rescan_device(struct device *dev) |
| { |
| struct scsi_driver *drv; |
| |
| if (!dev->driver) |
| return; |
| |
| drv = to_scsi_driver(dev->driver); |
| if (try_module_get(drv->owner)) { |
| if (drv->rescan) |
| drv->rescan(dev); |
| module_put(drv->owner); |
| } |
| } |
| EXPORT_SYMBOL(scsi_rescan_device); |
| |
| static void __scsi_scan_target(struct device *parent, unsigned int channel, |
| unsigned int id, unsigned int lun, int rescan) |
| { |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| int bflags = 0; |
| int res; |
| struct scsi_target *starget; |
| |
| if (shost->this_id == id) |
| /* |
| * Don't scan the host adapter |
| */ |
| return; |
| |
| starget = scsi_alloc_target(parent, channel, id); |
| if (!starget) |
| return; |
| |
| get_device(&starget->dev); |
| if (lun != SCAN_WILD_CARD) { |
| /* |
| * Scan for a specific host/chan/id/lun. |
| */ |
| scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); |
| goto out_reap; |
| } |
| |
| /* |
| * Scan LUN 0, if there is some response, scan further. Ideally, we |
| * would not configure LUN 0 until all LUNs are scanned. |
| */ |
| res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
| if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { |
| if (scsi_report_lun_scan(starget, bflags, rescan) != 0) |
| /* |
| * The REPORT LUN did not scan the target, |
| * do a sequential scan. |
| */ |
| scsi_sequential_lun_scan(starget, bflags, |
| res, starget->scsi_level, rescan); |
| } |
| |
| out_reap: |
| /* now determine if the target has any children at all |
| * and if not, nuke it */ |
| scsi_target_reap(starget); |
| |
| put_device(&starget->dev); |
| } |
| |
| /** |
| * scsi_scan_target - scan a target id, possibly including all LUNs on the |
| * target. |
| * @parent: host to scan |
| * @channel: channel to scan |
| * @id: target id to scan |
| * @lun: Specific LUN to scan or SCAN_WILD_CARD |
| * @rescan: passed to LUN scanning routines |
| * |
| * Description: |
| * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, |
| * and possibly all LUNs on the target id. |
| * |
| * First try a REPORT LUN scan, if that does not scan the target, do a |
| * sequential scan of LUNs on the target id. |
| **/ |
| void scsi_scan_target(struct device *parent, unsigned int channel, |
| unsigned int id, unsigned int lun, int rescan) |
| { |
| struct Scsi_Host *shost = dev_to_shost(parent); |
| |
| down(&shost->scan_mutex); |
| if (scsi_host_scan_allowed(shost)) |
| __scsi_scan_target(parent, channel, id, lun, rescan); |
| up(&shost->scan_mutex); |
| } |
| EXPORT_SYMBOL(scsi_scan_target); |
| |
| static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, |
| unsigned int id, unsigned int lun, int rescan) |
| { |
| uint order_id; |
| |
| if (id == SCAN_WILD_CARD) |
| for (id = 0; id < shost->max_id; ++id) { |
| /* |
| * XXX adapter drivers when possible (FCP, iSCSI) |
| * could modify max_id to match the current max, |
| * not the absolute max. |
| * |
| * XXX add a shost id iterator, so for example, |
| * the FC ID can be the same as a target id |
| * without a huge overhead of sparse id's. |
| */ |
| if (shost->reverse_ordering) |
| /* |
| * Scan from high to low id. |
| */ |
| order_id = shost->max_id - id - 1; |
| else |
| order_id = id; |
| __scsi_scan_target(&shost->shost_gendev, channel, |
| order_id, lun, rescan); |
| } |
| else |
| __scsi_scan_target(&shost->shost_gendev, channel, |
| id, lun, rescan); |
| } |
| |
| int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, |
| unsigned int id, unsigned int lun, int rescan) |
| { |
| SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
| "%s: <%u:%u:%u>\n", |
| __FUNCTION__, channel, id, lun)); |
| |
| if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || |
| ((id != SCAN_WILD_CARD) && (id > shost->max_id)) || |
| ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) |
| return -EINVAL; |
| |
| down(&shost->scan_mutex); |
| if (scsi_host_scan_allowed(shost)) { |
| if (channel == SCAN_WILD_CARD) |
| for (channel = 0; channel <= shost->max_channel; |
| channel++) |
| scsi_scan_channel(shost, channel, id, lun, |
| rescan); |
| else |
| scsi_scan_channel(shost, channel, id, lun, rescan); |
| } |
| up(&shost->scan_mutex); |
| |
| return 0; |
| } |
| |
| /** |
| * scsi_scan_host - scan the given adapter |
| * @shost: adapter to scan |
| **/ |
| void scsi_scan_host(struct Scsi_Host *shost) |
| { |
| scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, |
| SCAN_WILD_CARD, 0); |
| } |
| EXPORT_SYMBOL(scsi_scan_host); |
| |
| void scsi_forget_host(struct Scsi_Host *shost) |
| { |
| struct scsi_device *sdev; |
| unsigned long flags; |
| |
| restart: |
| spin_lock_irqsave(shost->host_lock, flags); |
| list_for_each_entry(sdev, &shost->__devices, siblings) { |
| if (sdev->sdev_state == SDEV_DEL) |
| continue; |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| __scsi_remove_device(sdev); |
| goto restart; |
| } |
| spin_unlock_irqrestore(shost->host_lock, flags); |
| } |
| |
| /* |
| * Function: scsi_get_host_dev() |
| * |
| * Purpose: Create a scsi_device that points to the host adapter itself. |
| * |
| * Arguments: SHpnt - Host that needs a scsi_device |
| * |
| * Lock status: None assumed. |
| * |
| * Returns: The scsi_device or NULL |
| * |
| * Notes: |
| * Attach a single scsi_device to the Scsi_Host - this should |
| * be made to look like a "pseudo-device" that points to the |
| * HA itself. |
| * |
| * Note - this device is not accessible from any high-level |
| * drivers (including generics), which is probably not |
| * optimal. We can add hooks later to attach |
| */ |
| struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) |
| { |
| struct scsi_device *sdev = NULL; |
| struct scsi_target *starget; |
| |
| down(&shost->scan_mutex); |
| if (!scsi_host_scan_allowed(shost)) |
| goto out; |
| starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
| if (!starget) |
| goto out; |
| |
| sdev = scsi_alloc_sdev(starget, 0, NULL); |
| if (sdev) { |
| sdev->sdev_gendev.parent = get_device(&starget->dev); |
| sdev->borken = 0; |
| } |
| put_device(&starget->dev); |
| out: |
| up(&shost->scan_mutex); |
| return sdev; |
| } |
| EXPORT_SYMBOL(scsi_get_host_dev); |
| |
| /* |
| * Function: scsi_free_host_dev() |
| * |
| * Purpose: Free a scsi_device that points to the host adapter itself. |
| * |
| * Arguments: SHpnt - Host that needs a scsi_device |
| * |
| * Lock status: None assumed. |
| * |
| * Returns: Nothing |
| * |
| * Notes: |
| */ |
| void scsi_free_host_dev(struct scsi_device *sdev) |
| { |
| BUG_ON(sdev->id != sdev->host->this_id); |
| |
| scsi_destroy_sdev(sdev); |
| } |
| EXPORT_SYMBOL(scsi_free_host_dev); |
| |