c4e00fac42
Conflicts: drivers/scsi/nsp32.c drivers/scsi/pcmcia/nsp_cs.c Removal of randomness flag conflicts with SA_ -> IRQF_ global replacement. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
1618 lines
45 KiB
C
1618 lines
45 KiB
C
/*
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* scsi_scan.c
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*
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* Copyright (C) 2000 Eric Youngdale,
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* Copyright (C) 2002 Patrick Mansfield
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*
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* The general scanning/probing algorithm is as follows, exceptions are
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* made to it depending on device specific flags, compilation options, and
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* global variable (boot or module load time) settings.
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*
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* A specific LUN is scanned via an INQUIRY command; if the LUN has a
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* device attached, a scsi_device is allocated and setup for it.
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*
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* For every id of every channel on the given host:
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*
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* Scan LUN 0; if the target responds to LUN 0 (even if there is no
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* device or storage attached to LUN 0):
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*
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* If LUN 0 has a device attached, allocate and setup a
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* scsi_device for it.
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*
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* If target is SCSI-3 or up, issue a REPORT LUN, and scan
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* all of the LUNs returned by the REPORT LUN; else,
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* sequentially scan LUNs up until some maximum is reached,
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* or a LUN is seen that cannot have a device attached to it.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <asm/semaphore.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_devinfo.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_eh.h>
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#include "scsi_priv.h"
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#include "scsi_logging.h"
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#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
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" SCSI scanning, some SCSI devices might not be configured\n"
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/*
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* Default timeout
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*/
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#define SCSI_TIMEOUT (2*HZ)
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/*
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* Prefix values for the SCSI id's (stored in driverfs name field)
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*/
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#define SCSI_UID_SER_NUM 'S'
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#define SCSI_UID_UNKNOWN 'Z'
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/*
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* Return values of some of the scanning functions.
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*
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* SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
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* includes allocation or general failures preventing IO from being sent.
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*
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* SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
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* on the given LUN.
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*
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* SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
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* given LUN.
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*/
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#define SCSI_SCAN_NO_RESPONSE 0
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#define SCSI_SCAN_TARGET_PRESENT 1
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#define SCSI_SCAN_LUN_PRESENT 2
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static const char *scsi_null_device_strs = "nullnullnullnull";
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#define MAX_SCSI_LUNS 512
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#ifdef CONFIG_SCSI_MULTI_LUN
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static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
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#else
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static unsigned int max_scsi_luns = 1;
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#endif
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module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(max_luns,
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"last scsi LUN (should be between 1 and 2^32-1)");
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/*
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* max_scsi_report_luns: the maximum number of LUNS that will be
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* returned from the REPORT LUNS command. 8 times this value must
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* be allocated. In theory this could be up to an 8 byte value, but
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* in practice, the maximum number of LUNs suppored by any device
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* is about 16k.
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*/
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static unsigned int max_scsi_report_luns = 511;
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module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(max_report_luns,
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"REPORT LUNS maximum number of LUNS received (should be"
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" between 1 and 16384)");
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static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
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module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
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MODULE_PARM_DESC(inq_timeout,
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"Timeout (in seconds) waiting for devices to answer INQUIRY."
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" Default is 5. Some non-compliant devices need more.");
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/**
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* scsi_unlock_floptical - unlock device via a special MODE SENSE command
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* @sdev: scsi device to send command to
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* @result: area to store the result of the MODE SENSE
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*
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* Description:
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* Send a vendor specific MODE SENSE (not a MODE SELECT) command.
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* Called for BLIST_KEY devices.
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**/
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static void scsi_unlock_floptical(struct scsi_device *sdev,
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unsigned char *result)
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{
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unsigned char scsi_cmd[MAX_COMMAND_SIZE];
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printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
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scsi_cmd[0] = MODE_SENSE;
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scsi_cmd[1] = 0;
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scsi_cmd[2] = 0x2e;
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scsi_cmd[3] = 0;
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scsi_cmd[4] = 0x2a; /* size */
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scsi_cmd[5] = 0;
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scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
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SCSI_TIMEOUT, 3);
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}
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/**
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* print_inquiry - printk the inquiry information
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* @inq_result: printk this SCSI INQUIRY
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*
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* Description:
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* printk the vendor, model, and other information found in the
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* INQUIRY data in @inq_result.
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*
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* Notes:
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* Remove this, and replace with a hotplug event that logs any
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* relevant information.
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**/
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static void print_inquiry(unsigned char *inq_result)
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{
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int i;
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printk(KERN_NOTICE " Vendor: ");
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for (i = 8; i < 16; i++)
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if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
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printk("%c", inq_result[i]);
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else
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printk(" ");
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printk(" Model: ");
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for (i = 16; i < 32; i++)
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if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
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printk("%c", inq_result[i]);
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else
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printk(" ");
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printk(" Rev: ");
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for (i = 32; i < 36; i++)
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if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
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printk("%c", inq_result[i]);
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else
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printk(" ");
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printk("\n");
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i = inq_result[0] & 0x1f;
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printk(KERN_NOTICE " Type: %s ",
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i <
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MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] :
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"Unknown ");
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printk(" ANSI SCSI revision: %02x",
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inq_result[2] & 0x07);
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if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1)
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printk(" CCS\n");
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else
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printk("\n");
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}
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/**
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* scsi_alloc_sdev - allocate and setup a scsi_Device
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*
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* Description:
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* Allocate, initialize for io, and return a pointer to a scsi_Device.
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* Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
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* adds scsi_Device to the appropriate list.
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*
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* Return value:
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* scsi_Device pointer, or NULL on failure.
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**/
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static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
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unsigned int lun, void *hostdata)
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{
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struct scsi_device *sdev;
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int display_failure_msg = 1, ret;
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
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GFP_ATOMIC);
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if (!sdev)
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goto out;
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sdev->vendor = scsi_null_device_strs;
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sdev->model = scsi_null_device_strs;
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sdev->rev = scsi_null_device_strs;
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sdev->host = shost;
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sdev->id = starget->id;
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sdev->lun = lun;
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sdev->channel = starget->channel;
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sdev->sdev_state = SDEV_CREATED;
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INIT_LIST_HEAD(&sdev->siblings);
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INIT_LIST_HEAD(&sdev->same_target_siblings);
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INIT_LIST_HEAD(&sdev->cmd_list);
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INIT_LIST_HEAD(&sdev->starved_entry);
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spin_lock_init(&sdev->list_lock);
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sdev->sdev_gendev.parent = get_device(&starget->dev);
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sdev->sdev_target = starget;
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/* usually NULL and set by ->slave_alloc instead */
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sdev->hostdata = hostdata;
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/* if the device needs this changing, it may do so in the
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* slave_configure function */
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sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
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/*
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* Some low level driver could use device->type
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*/
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sdev->type = -1;
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/*
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* Assume that the device will have handshaking problems,
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* and then fix this field later if it turns out it
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* doesn't
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*/
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sdev->borken = 1;
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sdev->request_queue = scsi_alloc_queue(sdev);
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if (!sdev->request_queue) {
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/* release fn is set up in scsi_sysfs_device_initialise, so
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* have to free and put manually here */
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put_device(&starget->dev);
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kfree(sdev);
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goto out;
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}
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sdev->request_queue->queuedata = sdev;
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scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
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scsi_sysfs_device_initialize(sdev);
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if (shost->hostt->slave_alloc) {
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ret = shost->hostt->slave_alloc(sdev);
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if (ret) {
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/*
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* if LLDD reports slave not present, don't clutter
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* console with alloc failure messages
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*/
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if (ret == -ENXIO)
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display_failure_msg = 0;
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goto out_device_destroy;
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}
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}
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return sdev;
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out_device_destroy:
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transport_destroy_device(&sdev->sdev_gendev);
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put_device(&sdev->sdev_gendev);
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out:
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if (display_failure_msg)
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printk(ALLOC_FAILURE_MSG, __FUNCTION__);
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return NULL;
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}
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static void scsi_target_dev_release(struct device *dev)
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{
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struct device *parent = dev->parent;
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struct scsi_target *starget = to_scsi_target(dev);
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kfree(starget);
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put_device(parent);
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}
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int scsi_is_target_device(const struct device *dev)
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{
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return dev->release == scsi_target_dev_release;
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}
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EXPORT_SYMBOL(scsi_is_target_device);
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static struct scsi_target *__scsi_find_target(struct device *parent,
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int channel, uint id)
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{
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struct scsi_target *starget, *found_starget = NULL;
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struct Scsi_Host *shost = dev_to_shost(parent);
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/*
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* Search for an existing target for this sdev.
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*/
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list_for_each_entry(starget, &shost->__targets, siblings) {
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if (starget->id == id &&
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starget->channel == channel) {
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found_starget = starget;
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break;
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}
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}
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if (found_starget)
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get_device(&found_starget->dev);
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return found_starget;
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}
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static struct scsi_target *scsi_alloc_target(struct device *parent,
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int channel, uint id)
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{
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struct Scsi_Host *shost = dev_to_shost(parent);
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struct device *dev = NULL;
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unsigned long flags;
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const int size = sizeof(struct scsi_target)
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+ shost->transportt->target_size;
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struct scsi_target *starget;
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struct scsi_target *found_target;
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int error;
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starget = kzalloc(size, GFP_KERNEL);
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if (!starget) {
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printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
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return NULL;
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}
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dev = &starget->dev;
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device_initialize(dev);
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starget->reap_ref = 1;
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dev->parent = get_device(parent);
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dev->release = scsi_target_dev_release;
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sprintf(dev->bus_id, "target%d:%d:%d",
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shost->host_no, channel, id);
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starget->id = id;
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starget->channel = channel;
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INIT_LIST_HEAD(&starget->siblings);
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INIT_LIST_HEAD(&starget->devices);
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starget->state = STARGET_RUNNING;
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retry:
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spin_lock_irqsave(shost->host_lock, flags);
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found_target = __scsi_find_target(parent, channel, id);
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if (found_target)
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goto found;
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list_add_tail(&starget->siblings, &shost->__targets);
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spin_unlock_irqrestore(shost->host_lock, flags);
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/* allocate and add */
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transport_setup_device(dev);
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error = device_add(dev);
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if (error) {
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dev_err(dev, "target device_add failed, error %d\n", error);
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spin_lock_irqsave(shost->host_lock, flags);
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list_del_init(&starget->siblings);
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spin_unlock_irqrestore(shost->host_lock, flags);
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transport_destroy_device(dev);
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put_device(parent);
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kfree(starget);
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return NULL;
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}
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transport_add_device(dev);
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if (shost->hostt->target_alloc) {
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error = shost->hostt->target_alloc(starget);
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if(error) {
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dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
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/* don't want scsi_target_reap to do the final
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* put because it will be under the host lock */
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get_device(dev);
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scsi_target_reap(starget);
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put_device(dev);
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return NULL;
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}
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}
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return starget;
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found:
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found_target->reap_ref++;
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spin_unlock_irqrestore(shost->host_lock, flags);
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put_device(parent);
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if (found_target->state != STARGET_DEL) {
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kfree(starget);
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return found_target;
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}
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/* Unfortunately, we found a dying target; need to
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* wait until it's dead before we can get a new one */
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put_device(&found_target->dev);
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flush_scheduled_work();
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goto retry;
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}
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static void scsi_target_reap_usercontext(void *data)
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{
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struct scsi_target *starget = data;
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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unsigned long flags;
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transport_remove_device(&starget->dev);
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device_del(&starget->dev);
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transport_destroy_device(&starget->dev);
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spin_lock_irqsave(shost->host_lock, flags);
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if (shost->hostt->target_destroy)
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shost->hostt->target_destroy(starget);
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list_del_init(&starget->siblings);
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spin_unlock_irqrestore(shost->host_lock, flags);
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put_device(&starget->dev);
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}
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|
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/**
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* scsi_target_reap - check to see if target is in use and destroy if not
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*
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* @starget: target to be checked
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*
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* This is used after removing a LUN or doing a last put of the target
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* it checks atomically that nothing is using the target and removes
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* it if so.
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*/
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void scsi_target_reap(struct scsi_target *starget)
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{
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struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
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unsigned long flags;
|
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|
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spin_lock_irqsave(shost->host_lock, flags);
|
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|
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if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
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BUG_ON(starget->state == STARGET_DEL);
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starget->state = STARGET_DEL;
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spin_unlock_irqrestore(shost->host_lock, flags);
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execute_in_process_context(scsi_target_reap_usercontext,
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starget, &starget->ew);
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return;
|
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|
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}
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spin_unlock_irqrestore(shost->host_lock, flags);
|
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|
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return;
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}
|
|
|
|
/**
|
|
* 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:
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|
* Probe the lun associated with @req using a standard SCSI INQUIRY;
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|
*
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* If the INQUIRY is successful, zero is returned and the
|
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* 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,
|
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int result_len, int *bflags)
|
|
{
|
|
unsigned char scsi_cmd[MAX_COMMAND_SIZE];
|
|
int first_inquiry_len, try_inquiry_len, next_inquiry_len;
|
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int response_len = 0;
|
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int pass, count, result;
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struct scsi_sense_hdr sshdr;
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|
|
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*bflags = 0;
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|
|
|
/* Perform up to 3 passes. The first pass uses a conservative
|
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* transfer length of 36 unless sdev->inquiry_len specifies a
|
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* different value. */
|
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first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
|
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try_inquiry_len = first_inquiry_len;
|
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pass = 1;
|
|
|
|
next_pass:
|
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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_RAID:
|
|
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;
|
|
|
|
/*
|
|
* End sysfs 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;
|
|
|
|
/*
|
|
* Maximum 512 sector transfer length
|
|
* broken RA4x00 Compaq Disk Array
|
|
*/
|
|
if (*bflags & BLIST_MAX_512)
|
|
blk_queue_max_sectors(sdev->request_queue, 512);
|
|
|
|
/*
|
|
* 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) {
|
|
int ret = sdev->host->hostt->slave_configure(sdev);
|
|
if (ret) {
|
|
/*
|
|
* if LLDD reports slave not present, don't clutter
|
|
* console with alloc failure messages
|
|
*/
|
|
if (ret != -ENXIO) {
|
|
sdev_printk(KERN_ERR, sdev,
|
|
"failed to configure device\n");
|
|
}
|
|
return SCSI_SCAN_NO_RESPONSE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
scsi_device_set_state(sdev, SDEV_DEL);
|
|
if (sdev->host->hostt->slave_destroy)
|
|
sdev->host->hostt->slave_destroy(sdev);
|
|
transport_destroy_device(&sdev->sdev_gendev);
|
|
put_device(&sdev->sdev_gendev);
|
|
}
|
|
|
|
#ifdef CONFIG_SCSI_LOGGING
|
|
/**
|
|
* scsi_inq_str - print INQUIRY data from min to max index,
|
|
* strip trailing whitespace
|
|
* @buf: Output buffer with at least end-first+1 bytes of space
|
|
* @inq: Inquiry buffer (input)
|
|
* @first: Offset of string into inq
|
|
* @end: Index after last character in inq
|
|
*/
|
|
static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
|
|
unsigned first, unsigned end)
|
|
{
|
|
unsigned term = 0, idx;
|
|
|
|
for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
|
|
if (inq[idx+first] > ' ') {
|
|
buf[idx] = inq[idx+first];
|
|
term = idx+1;
|
|
} else {
|
|
buf[idx] = ' ';
|
|
}
|
|
}
|
|
buf[term] = 0;
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (bflagsp)
|
|
*bflagsp = bflags;
|
|
/*
|
|
* result contains valid SCSI INQUIRY data.
|
|
*/
|
|
if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
|
|
/*
|
|
* 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(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
|
|
" peripheral qualifier of 3, device not"
|
|
" added\n"))
|
|
if (lun == 0) {
|
|
SCSI_LOG_SCAN_BUS(1, {
|
|
unsigned char vend[9];
|
|
unsigned char mod[17];
|
|
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"scsi scan: consider passing scsi_mod."
|
|
"dev_flags=%s:%s:0x240 or 0x800240\n",
|
|
scsi_inq_str(vend, result, 8, 16),
|
|
scsi_inq_str(mod, result, 16, 32));
|
|
});
|
|
}
|
|
|
|
res = SCSI_SCAN_TARGET_PRESENT;
|
|
goto out_free_result;
|
|
}
|
|
|
|
/*
|
|
* Non-standard SCSI targets may set the PDT to 0x1f (unknown or
|
|
* no device type) instead of using the Peripheral Qualifier to
|
|
* indicate that no LUN is present. For example, USB UFI does this.
|
|
*/
|
|
if (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f) {
|
|
SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
|
|
"scsi scan: peripheral device type"
|
|
" of 31, 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);
|
|
}
|
|
}
|
|
|
|
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
|
|
*
|
|
* 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 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 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)
|
|
return 1;
|
|
if (starget->scsi_level < SCSI_2 &&
|
|
starget->scsi_level != SCSI_UNKNOWN)
|
|
return 1;
|
|
if (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 = ERR_PTR(-ENODEV);
|
|
struct device *parent = &shost->shost_gendev;
|
|
struct scsi_target *starget;
|
|
|
|
starget = scsi_alloc_target(parent, channel, id);
|
|
if (!starget)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
get_device(&starget->dev);
|
|
mutex_lock(&shost->scan_mutex);
|
|
if (scsi_host_scan_allowed(shost))
|
|
scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
|
|
mutex_unlock(&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,
|
|
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);
|
|
|
|
mutex_lock(&shost->scan_mutex);
|
|
if (scsi_host_scan_allowed(shost))
|
|
__scsi_scan_target(parent, channel, id, lun, rescan);
|
|
mutex_unlock(&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;
|
|
|
|
mutex_lock(&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);
|
|
}
|
|
mutex_unlock(&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;
|
|
|
|
mutex_lock(&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:
|
|
mutex_unlock(&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);
|
|
|