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linux/drivers/scsi/scsi_devinfo.c
Mike Christie 35e9a9f939 SCSI: add 1024 max sectors black list flag 
This works around a issue with qnap iscsi targets not handling large IOs
very well.

The target returns:

VPD INQUIRY: Block limits page (SBC)
  Maximum compare and write length: 1 blocks
  Optimal transfer length granularity: 1 blocks
  Maximum transfer length: 4294967295 blocks
  Optimal transfer length: 4294967295 blocks
  Maximum prefetch, xdread, xdwrite transfer length: 0 blocks
  Maximum unmap LBA count: 8388607
  Maximum unmap block descriptor count: 1
  Optimal unmap granularity: 16383
  Unmap granularity alignment valid: 0
  Unmap granularity alignment: 0
  Maximum write same length: 0xffffffff blocks
  Maximum atomic transfer length: 0
  Atomic alignment: 0
  Atomic transfer length granularity: 0

and it is *sometimes* able to handle at least one IO of size up to 8 MB. We
have seen in traces where it will sometimes work, but other times it
looks like it fails and it looks like it returns failures if we send
multiple large IOs sometimes. Also it looks like it can return 2 different
errors. It will sometimes send iscsi reject errors indicating out of
resources or it will send invalid cdb illegal requests check conditions.
And then when it sends iscsi rejects it does not seem to handle retries
when there are command sequence holes, so I could not just add code to
try and gracefully handle that error code.

The problem is that we do not have a good contact for the company,
so we are not able to determine under what conditions it returns
which error and why it sometimes works.

So, this patch just adds a new black list flag to set targets like this to
the old max safe sectors of 1024. The max_hw_sectors changes added in 3.19
caused this regression, so I also ccing stable.

Reported-by: Christian Hesse <list@eworm.de>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: stable@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-04-27 09:38:06 -07:00

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#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_devinfo.h>
#include "scsi_priv.h"
/*
* scsi_dev_info_list: structure to hold black/white listed devices.
*/
struct scsi_dev_info_list {
struct list_head dev_info_list;
char vendor[8];
char model[16];
unsigned flags;
unsigned compatible; /* for use with scsi_static_device_list entries */
};
struct scsi_dev_info_list_table {
struct list_head node; /* our node for being on the master list */
struct list_head scsi_dev_info_list; /* head of dev info list */
const char *name; /* name of list for /proc (NULL for global) */
int key; /* unique numeric identifier */
};
static const char spaces[] = " "; /* 16 of them */
static unsigned scsi_default_dev_flags;
static LIST_HEAD(scsi_dev_info_list);
static char scsi_dev_flags[256];
/*
* scsi_static_device_list: deprecated list of devices that require
* settings that differ from the default, includes black-listed (broken)
* devices. The entries here are added to the tail of scsi_dev_info_list
* via scsi_dev_info_list_init.
*
* Do not add to this list, use the command line or proc interface to add
* to the scsi_dev_info_list. This table will eventually go away.
*/
static struct {
char *vendor;
char *model;
char *revision; /* revision known to be bad, unused */
unsigned flags;
} scsi_static_device_list[] __initdata = {
/*
* The following devices are known not to tolerate a lun != 0 scan
* for one reason or another. Some will respond to all luns,
* others will lock up.
*/
{"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN}, /* locks up */
{"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN}, /* locks up */
{"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN}, /* locks up */
{"DENON", "DRD-25X", "V", BLIST_NOLUN}, /* locks up */
{"HITACHI", "DK312C", "CM81", BLIST_NOLUN}, /* responds to all lun */
{"HITACHI", "DK314C", "CR21", BLIST_NOLUN}, /* responds to all lun */
{"IBM", "2104-DU3", NULL, BLIST_NOLUN}, /* locks up */
{"IBM", "2104-TU3", NULL, BLIST_NOLUN}, /* locks up */
{"IMS", "CDD521/10", "2.06", BLIST_NOLUN}, /* locks up */
{"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN}, /* locks up */
{"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN}, /* locks up */
{"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN}, /* locks up */
{"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN}, /* locks up */
{"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN}, /* locks up */
{"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN}, /* responds to all lun */
{"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN}, /* responds to all lun */
{"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
{"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN}, /* responds to all lun */
{"RODIME", "RO3000S", "2.33", BLIST_NOLUN}, /* locks up */
{"SUN", "SENA", NULL, BLIST_NOLUN}, /* responds to all luns */
/*
* The following causes a failed REQUEST SENSE on lun 1 for
* aha152x controller, which causes SCSI code to reset bus.
*/
{"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
/*
* The following causes a failed REQUEST SENSE on lun 1 for
* aha152x controller, which causes SCSI code to reset bus.
*/
{"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
{"SEAGATE", "ST296", "921", BLIST_NOLUN}, /* responds to all lun */
{"SEAGATE", "ST1581", "6538", BLIST_NOLUN}, /* responds to all lun */
{"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
{"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
{"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
{"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
{"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
{"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN}, /* locks up */
{"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN}, /* locks up */
/*
* The following causes a failed REQUEST SENSE on lun 1 for
* seagate controller, which causes SCSI code to reset bus.
*/
{"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
{"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN}, /* responds to all lun */
/*
* The following causes a failed REQUEST SENSE on lun 1 for
* seagate controller, which causes SCSI code to reset bus.
*/
{"HP", "C1750A", "3226", BLIST_NOLUN}, /* scanjet iic */
{"HP", "C1790A", "", BLIST_NOLUN}, /* scanjet iip */
{"HP", "C2500A", "", BLIST_NOLUN}, /* scanjet iicx */
{"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN}, /* locks up */
{"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN}, /* responds to all lun */
{"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN}, /* locks up */
{"NEC", "D3856", "0009", BLIST_NOLUN},
{"QUANTUM", "LPS525S", "3110", BLIST_NOLUN}, /* locks up */
{"QUANTUM", "PD1225S", "3110", BLIST_NOLUN}, /* locks up */
{"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN}, /* locks up */
{"RELISYS", "Scorpio", NULL, BLIST_NOLUN}, /* responds to all lun */
{"SANKYO", "CP525", "6.64", BLIST_NOLUN}, /* causes failed REQ SENSE, extra reset */
{"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},
{"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
{"YAMAHA", "CDR100", "1.00", BLIST_NOLUN}, /* locks up */
{"YAMAHA", "CDR102", "1.00", BLIST_NOLUN}, /* locks up */
{"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN}, /* locks up */
{"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN}, /* locks up */
{"", "Scanner", "1.80", BLIST_NOLUN}, /* responds to all lun */
/*
* Other types of devices that have special flags.
* Note that all USB devices should have the BLIST_INQUIRY_36 flag.
*/
{"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
{"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
{"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
{"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
{"BELKIN", "USB 2 HS-CF", "1.95", BLIST_FORCELUN | BLIST_INQUIRY_36},
{"BROWNIE", "1200U3P", NULL, BLIST_NOREPORTLUN},
{"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
{"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
{"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
{"CMD", "CRA-7280", NULL, BLIST_SPARSELUN}, /* CMD RAID Controller */
{"CNSI", "G7324", NULL, BLIST_SPARSELUN}, /* Chaparral G7324 RAID */
{"CNSi", "G8324", NULL, BLIST_SPARSELUN}, /* Chaparral G8324 RAID */
{"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
BLIST_MAX_512 | BLIST_REPORTLUN2}, /* Compaq RA4x00 */
{"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
{"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
{"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
{"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
{"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
{"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
{"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
{"DELL", "PV660F", NULL, BLIST_SPARSELUN},
{"DELL", "PV660F PSEUDO", NULL, BLIST_SPARSELUN},
{"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN}, /* Dell PV 530F */
{"DELL", "PV530F", NULL, BLIST_SPARSELUN},
{"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
{"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, storage on LUN 0 */
{"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, no storage on LUN 0 */
{"EMC", "Invista", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_FORCELUN},
{"EMULEX", "MD21/S2 ESDI", NULL, BLIST_SINGLELUN},
{"easyRAID", "16P", NULL, BLIST_NOREPORTLUN},
{"easyRAID", "X6P", NULL, BLIST_NOREPORTLUN},
{"easyRAID", "F8", NULL, BLIST_NOREPORTLUN},
{"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
{"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN | BLIST_INQUIRY_36},
{"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN | BLIST_INQUIRY_36},
{"HITACHI", "DF400", "*", BLIST_REPORTLUN2},
{"HITACHI", "DF500", "*", BLIST_REPORTLUN2},
{"HITACHI", "DISK-SUBSYSTEM", "*", BLIST_REPORTLUN2},
{"HITACHI", "HUS1530", "*", BLIST_NO_DIF},
{"HITACHI", "OPEN-", "*", BLIST_REPORTLUN2},
{"HITACHI", "OP-C-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HITACHI", "3380-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HITACHI", "3390-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HITACHI", "6586-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HITACHI", "6588-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP VA7400 */
{"HP", "OPEN-", "*", BLIST_REPORTLUN2}, /* HP XP Arrays */
{"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
{"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
{"HP", "C1557A", NULL, BLIST_FORCELUN},
{"HP", "C3323-300", "4269", BLIST_NOTQ},
{"HP", "C5713A", NULL, BLIST_NOREPORTLUN},
{"HP", "DF400", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "DF500", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "DF600", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "OP-C-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "3380-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "3390-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "6586-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"HP", "6588-", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
{"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
{"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
{"IOMEGA", "ZIP", NULL, BLIST_NOTQ | BLIST_NOLUN},
{"IOMEGA", "Io20S *F", NULL, BLIST_KEY},
{"INSITE", "Floptical F*8I", NULL, BLIST_KEY},
{"INSITE", "I325VM", NULL, BLIST_KEY},
{"Intel", "Multi-Flex", NULL, BLIST_NO_RSOC},
{"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
{"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
{"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
{"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
{"Medion", "Flash XL MMC/SD", "2.6D", BLIST_FORCELUN},
{"MegaRAID", "LD", NULL, BLIST_FORCELUN},
{"MICROP", "4110", NULL, BLIST_NOTQ},
{"MSFT", "Virtual HD", NULL, BLIST_NO_RSOC},
{"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
{"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
{"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"NEC", "iStorage", NULL, BLIST_REPORTLUN2},
{"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
{"Promise", "VTrak E610f", NULL, BLIST_SPARSELUN | BLIST_NO_RSOC},
{"Promise", "", NULL, BLIST_SPARSELUN},
{"QNAP", "iSCSI Storage", NULL, BLIST_MAX_1024},
{"QUANTUM", "XP34301", "1071", BLIST_NOTQ},
{"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
{"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
{"SEAGATE", "ST34555N", "0930", BLIST_NOTQ}, /* Chokes on tagged INQUIRY */
{"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
{"SEAGATE", "ST900MM0006", NULL, BLIST_SKIP_VPD_PAGES},
{"SGI", "RAID3", "*", BLIST_SPARSELUN},
{"SGI", "RAID5", "*", BLIST_SPARSELUN},
{"SGI", "TP9100", "*", BLIST_REPORTLUN2},
{"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
{"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
{"SUN", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
{"DELL", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
{"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
{"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
{"SONY", "TSL", NULL, BLIST_FORCELUN}, /* DDS3 & DDS4 autoloaders */
{"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
{"SUN", "T300", "*", BLIST_SPARSELUN},
{"SUN", "T4", "*", BLIST_SPARSELUN},
{"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
{"Tornado-", "F4", "*", BLIST_NOREPORTLUN},
{"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
{"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
{"Traxdata", "CDR4120", NULL, BLIST_NOLUN}, /* locks up */
{"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
{"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
{"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
{"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
{"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
{"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
{"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
{"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
{ NULL, NULL, NULL, 0 },
};
static struct scsi_dev_info_list_table *scsi_devinfo_lookup_by_key(int key)
{
struct scsi_dev_info_list_table *devinfo_table;
int found = 0;
list_for_each_entry(devinfo_table, &scsi_dev_info_list, node)
if (devinfo_table->key == key) {
found = 1;
break;
}
if (!found)
return ERR_PTR(-EINVAL);
return devinfo_table;
}
/*
* scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
* devinfo vendor and model strings.
*/
static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
char *from, int compatible)
{
size_t from_length;
from_length = strlen(from);
strncpy(to, from, min(to_length, from_length));
if (from_length < to_length) {
if (compatible) {
/*
* NUL terminate the string if it is short.
*/
to[from_length] = '\0';
} else {
/*
* space pad the string if it is short.
*/
strncpy(&to[from_length], spaces,
to_length - from_length);
}
}
if (from_length > to_length)
printk(KERN_WARNING "%s: %s string '%s' is too long\n",
__func__, name, from);
}
/**
* scsi_dev_info_list_add - add one dev_info list entry.
* @compatible: if true, null terminate short strings. Otherwise space pad.
* @vendor: vendor string
* @model: model (product) string
* @strflags: integer string
* @flags: if strflags NULL, use this flag value
*
* Description:
* Create and add one dev_info entry for @vendor, @model, @strflags or
* @flag. If @compatible, add to the tail of the list, do not space
* pad, and set devinfo->compatible. The scsi_static_device_list entries
* are added with @compatible 1 and @clfags NULL.
*
* Returns: 0 OK, -error on failure.
**/
static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
char *strflags, int flags)
{
return scsi_dev_info_list_add_keyed(compatible, vendor, model,
strflags, flags,
SCSI_DEVINFO_GLOBAL);
}
/**
* scsi_dev_info_list_add_keyed - add one dev_info list entry.
* @compatible: if true, null terminate short strings. Otherwise space pad.
* @vendor: vendor string
* @model: model (product) string
* @strflags: integer string
* @flags: if strflags NULL, use this flag value
* @key: specify list to use
*
* Description:
* Create and add one dev_info entry for @vendor, @model,
* @strflags or @flag in list specified by @key. If @compatible,
* add to the tail of the list, do not space pad, and set
* devinfo->compatible. The scsi_static_device_list entries are
* added with @compatible 1 and @clfags NULL.
*
* Returns: 0 OK, -error on failure.
**/
int scsi_dev_info_list_add_keyed(int compatible, char *vendor, char *model,
char *strflags, int flags, int key)
{
struct scsi_dev_info_list *devinfo;
struct scsi_dev_info_list_table *devinfo_table =
scsi_devinfo_lookup_by_key(key);
if (IS_ERR(devinfo_table))
return PTR_ERR(devinfo_table);
devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
if (!devinfo) {
printk(KERN_ERR "%s: no memory\n", __func__);
return -ENOMEM;
}
scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
vendor, compatible);
scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
model, compatible);
if (strflags)
devinfo->flags = simple_strtoul(strflags, NULL, 0);
else
devinfo->flags = flags;
devinfo->compatible = compatible;
if (compatible)
list_add_tail(&devinfo->dev_info_list,
&devinfo_table->scsi_dev_info_list);
else
list_add(&devinfo->dev_info_list,
&devinfo_table->scsi_dev_info_list);
return 0;
}
EXPORT_SYMBOL(scsi_dev_info_list_add_keyed);
/**
* scsi_dev_info_list_del_keyed - remove one dev_info list entry.
* @vendor: vendor string
* @model: model (product) string
* @key: specify list to use
*
* Description:
* Remove and destroy one dev_info entry for @vendor, @model
* in list specified by @key.
*
* Returns: 0 OK, -error on failure.
**/
int scsi_dev_info_list_del_keyed(char *vendor, char *model, int key)
{
struct scsi_dev_info_list *devinfo, *found = NULL;
struct scsi_dev_info_list_table *devinfo_table =
scsi_devinfo_lookup_by_key(key);
if (IS_ERR(devinfo_table))
return PTR_ERR(devinfo_table);
list_for_each_entry(devinfo, &devinfo_table->scsi_dev_info_list,
dev_info_list) {
if (devinfo->compatible) {
/*
* Behave like the older version of get_device_flags.
*/
size_t max;
/*
* XXX why skip leading spaces? If an odd INQUIRY
* value, that should have been part of the
* scsi_static_device_list[] entry, such as " FOO"
* rather than "FOO". Since this code is already
* here, and we don't know what device it is
* trying to work with, leave it as-is.
*/
max = 8; /* max length of vendor */
while ((max > 0) && *vendor == ' ') {
max--;
vendor++;
}
/*
* XXX removing the following strlen() would be
* good, using it means that for a an entry not in
* the list, we scan every byte of every vendor
* listed in scsi_static_device_list[], and never match
* a single one (and still have to compare at
* least the first byte of each vendor).
*/
if (memcmp(devinfo->vendor, vendor,
min(max, strlen(devinfo->vendor))))
continue;
/*
* Skip spaces again.
*/
max = 16; /* max length of model */
while ((max > 0) && *model == ' ') {
max--;
model++;
}
if (memcmp(devinfo->model, model,
min(max, strlen(devinfo->model))))
continue;
found = devinfo;
} else {
if (!memcmp(devinfo->vendor, vendor,
sizeof(devinfo->vendor)) &&
!memcmp(devinfo->model, model,
sizeof(devinfo->model)))
found = devinfo;
}
if (found)
break;
}
if (found) {
list_del(&found->dev_info_list);
kfree(found);
return 0;
}
return -ENOENT;
}
EXPORT_SYMBOL(scsi_dev_info_list_del_keyed);
/**
* scsi_dev_info_list_add_str - parse dev_list and add to the scsi_dev_info_list.
* @dev_list: string of device flags to add
*
* Description:
* Parse dev_list, and add entries to the scsi_dev_info_list.
* dev_list is of the form "vendor:product:flag,vendor:product:flag".
* dev_list is modified via strsep. Can be called for command line
* addition, for proc or mabye a sysfs interface.
*
* Returns: 0 if OK, -error on failure.
**/
static int scsi_dev_info_list_add_str(char *dev_list)
{
char *vendor, *model, *strflags, *next;
char *next_check;
int res = 0;
next = dev_list;
if (next && next[0] == '"') {
/*
* Ignore both the leading and trailing quote.
*/
next++;
next_check = ",\"";
} else {
next_check = ",";
}
/*
* For the leading and trailing '"' case, the for loop comes
* through the last time with vendor[0] == '\0'.
*/
for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
&& (res == 0); vendor = strsep(&next, ":")) {
strflags = NULL;
model = strsep(&next, ":");
if (model)
strflags = strsep(&next, next_check);
if (!model || !strflags) {
printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
" '%s'\n", __func__, vendor, model,
strflags);
res = -EINVAL;
} else
res = scsi_dev_info_list_add(0 /* compatible */, vendor,
model, strflags, 0);
}
return res;
}
/**
* get_device_flags - get device specific flags from the dynamic device list.
* @sdev: &scsi_device to get flags for
* @vendor: vendor name
* @model: model name
*
* Description:
* Search the global scsi_dev_info_list (specified by list zero)
* for an entry matching @vendor and @model, if found, return the
* matching flags value, else return the host or global default
* settings. Called during scan time.
**/
int scsi_get_device_flags(struct scsi_device *sdev,
const unsigned char *vendor,
const unsigned char *model)
{
return scsi_get_device_flags_keyed(sdev, vendor, model,
SCSI_DEVINFO_GLOBAL);
}
/**
* scsi_get_device_flags_keyed - get device specific flags from the dynamic device list
* @sdev: &scsi_device to get flags for
* @vendor: vendor name
* @model: model name
* @key: list to look up
*
* Description:
* Search the scsi_dev_info_list specified by @key for an entry
* matching @vendor and @model, if found, return the matching
* flags value, else return the host or global default settings.
* Called during scan time.
**/
int scsi_get_device_flags_keyed(struct scsi_device *sdev,
const unsigned char *vendor,
const unsigned char *model,
int key)
{
struct scsi_dev_info_list *devinfo;
struct scsi_dev_info_list_table *devinfo_table;
devinfo_table = scsi_devinfo_lookup_by_key(key);
if (IS_ERR(devinfo_table))
return PTR_ERR(devinfo_table);
list_for_each_entry(devinfo, &devinfo_table->scsi_dev_info_list,
dev_info_list) {
if (devinfo->compatible) {
/*
* Behave like the older version of get_device_flags.
*/
size_t max;
/*
* XXX why skip leading spaces? If an odd INQUIRY
* value, that should have been part of the
* scsi_static_device_list[] entry, such as " FOO"
* rather than "FOO". Since this code is already
* here, and we don't know what device it is
* trying to work with, leave it as-is.
*/
max = 8; /* max length of vendor */
while ((max > 0) && *vendor == ' ') {
max--;
vendor++;
}
/*
* XXX removing the following strlen() would be
* good, using it means that for a an entry not in
* the list, we scan every byte of every vendor
* listed in scsi_static_device_list[], and never match
* a single one (and still have to compare at
* least the first byte of each vendor).
*/
if (memcmp(devinfo->vendor, vendor,
min(max, strlen(devinfo->vendor))))
continue;
/*
* Skip spaces again.
*/
max = 16; /* max length of model */
while ((max > 0) && *model == ' ') {
max--;
model++;
}
if (memcmp(devinfo->model, model,
min(max, strlen(devinfo->model))))
continue;
return devinfo->flags;
} else {
if (!memcmp(devinfo->vendor, vendor,
sizeof(devinfo->vendor)) &&
!memcmp(devinfo->model, model,
sizeof(devinfo->model)))
return devinfo->flags;
}
}
/* nothing found, return nothing */
if (key != SCSI_DEVINFO_GLOBAL)
return 0;
/* except for the global list, where we have an exception */
if (sdev->sdev_bflags)
return sdev->sdev_bflags;
return scsi_default_dev_flags;
}
EXPORT_SYMBOL(scsi_get_device_flags_keyed);
#ifdef CONFIG_SCSI_PROC_FS
struct double_list {
struct list_head *top;
struct list_head *bottom;
};
static int devinfo_seq_show(struct seq_file *m, void *v)
{
struct double_list *dl = v;
struct scsi_dev_info_list_table *devinfo_table =
list_entry(dl->top, struct scsi_dev_info_list_table, node);
struct scsi_dev_info_list *devinfo =
list_entry(dl->bottom, struct scsi_dev_info_list,
dev_info_list);
if (devinfo_table->scsi_dev_info_list.next == dl->bottom &&
devinfo_table->name)
seq_printf(m, "[%s]:\n", devinfo_table->name);
seq_printf(m, "'%.8s' '%.16s' 0x%x\n",
devinfo->vendor, devinfo->model, devinfo->flags);
return 0;
}
static void *devinfo_seq_start(struct seq_file *m, loff_t *ppos)
{
struct double_list *dl = kmalloc(sizeof(*dl), GFP_KERNEL);
loff_t pos = *ppos;
if (!dl)
return NULL;
list_for_each(dl->top, &scsi_dev_info_list) {
struct scsi_dev_info_list_table *devinfo_table =
list_entry(dl->top, struct scsi_dev_info_list_table,
node);
list_for_each(dl->bottom, &devinfo_table->scsi_dev_info_list)
if (pos-- == 0)
return dl;
}
kfree(dl);
return NULL;
}
static void *devinfo_seq_next(struct seq_file *m, void *v, loff_t *ppos)
{
struct double_list *dl = v;
struct scsi_dev_info_list_table *devinfo_table =
list_entry(dl->top, struct scsi_dev_info_list_table, node);
++*ppos;
dl->bottom = dl->bottom->next;
while (&devinfo_table->scsi_dev_info_list == dl->bottom) {
dl->top = dl->top->next;
if (dl->top == &scsi_dev_info_list) {
kfree(dl);
return NULL;
}
devinfo_table = list_entry(dl->top,
struct scsi_dev_info_list_table,
node);
dl->bottom = devinfo_table->scsi_dev_info_list.next;
}
return dl;
}
static void devinfo_seq_stop(struct seq_file *m, void *v)
{
kfree(v);
}
static const struct seq_operations scsi_devinfo_seq_ops = {
.start = devinfo_seq_start,
.next = devinfo_seq_next,
.stop = devinfo_seq_stop,
.show = devinfo_seq_show,
};
static int proc_scsi_devinfo_open(struct inode *inode, struct file *file)
{
return seq_open(file, &scsi_devinfo_seq_ops);
}
/*
* proc_scsi_dev_info_write - allow additions to scsi_dev_info_list via /proc.
*
* Description: Adds a black/white list entry for vendor and model with an
* integer value of flag to the scsi device info list.
* To use, echo "vendor:model:flag" > /proc/scsi/device_info
*/
static ssize_t proc_scsi_devinfo_write(struct file *file,
const char __user *buf,
size_t length, loff_t *ppos)
{
char *buffer;
ssize_t err = length;
if (!buf || length>PAGE_SIZE)
return -EINVAL;
if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
return -ENOMEM;
if (copy_from_user(buffer, buf, length)) {
err =-EFAULT;
goto out;
}
if (length < PAGE_SIZE)
buffer[length] = '\0';
else if (buffer[PAGE_SIZE-1]) {
err = -EINVAL;
goto out;
}
scsi_dev_info_list_add_str(buffer);
out:
free_page((unsigned long)buffer);
return err;
}
static const struct file_operations scsi_devinfo_proc_fops = {
.owner = THIS_MODULE,
.open = proc_scsi_devinfo_open,
.read = seq_read,
.write = proc_scsi_devinfo_write,
.llseek = seq_lseek,
.release = seq_release,
};
#endif /* CONFIG_SCSI_PROC_FS */
module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
MODULE_PARM_DESC(dev_flags,
"Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
" list entries for vendor and model with an integer value of flags"
" to the scsi device info list");
module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(default_dev_flags,
"scsi default device flag integer value");
/**
* scsi_exit_devinfo - remove /proc/scsi/device_info & the scsi_dev_info_list
**/
void scsi_exit_devinfo(void)
{
#ifdef CONFIG_SCSI_PROC_FS
remove_proc_entry("scsi/device_info", NULL);
#endif
scsi_dev_info_remove_list(SCSI_DEVINFO_GLOBAL);
}
/**
* scsi_dev_info_add_list - add a new devinfo list
* @key: key of the list to add
* @name: Name of the list to add (for /proc/scsi/device_info)
*
* Adds the requested list, returns zero on success, -EEXIST if the
* key is already registered to a list, or other error on failure.
*/
int scsi_dev_info_add_list(int key, const char *name)
{
struct scsi_dev_info_list_table *devinfo_table =
scsi_devinfo_lookup_by_key(key);
if (!IS_ERR(devinfo_table))
/* list already exists */
return -EEXIST;
devinfo_table = kmalloc(sizeof(*devinfo_table), GFP_KERNEL);
if (!devinfo_table)
return -ENOMEM;
INIT_LIST_HEAD(&devinfo_table->node);
INIT_LIST_HEAD(&devinfo_table->scsi_dev_info_list);
devinfo_table->name = name;
devinfo_table->key = key;
list_add_tail(&devinfo_table->node, &scsi_dev_info_list);
return 0;
}
EXPORT_SYMBOL(scsi_dev_info_add_list);
/**
* scsi_dev_info_remove_list - destroy an added devinfo list
* @key: key of the list to destroy
*
* Iterates over the entire list first, freeing all the values, then
* frees the list itself. Returns 0 on success or -EINVAL if the key
* can't be found.
*/
int scsi_dev_info_remove_list(int key)
{
struct list_head *lh, *lh_next;
struct scsi_dev_info_list_table *devinfo_table =
scsi_devinfo_lookup_by_key(key);
if (IS_ERR(devinfo_table))
/* no such list */
return -EINVAL;
/* remove from the master list */
list_del(&devinfo_table->node);
list_for_each_safe(lh, lh_next, &devinfo_table->scsi_dev_info_list) {
struct scsi_dev_info_list *devinfo;
devinfo = list_entry(lh, struct scsi_dev_info_list,
dev_info_list);
kfree(devinfo);
}
kfree(devinfo_table);
return 0;
}
EXPORT_SYMBOL(scsi_dev_info_remove_list);
/**
* scsi_init_devinfo - set up the dynamic device list.
*
* Description:
* Add command line entries from scsi_dev_flags, then add
* scsi_static_device_list entries to the scsi device info list.
*/
int __init scsi_init_devinfo(void)
{
#ifdef CONFIG_SCSI_PROC_FS
struct proc_dir_entry *p;
#endif
int error, i;
error = scsi_dev_info_add_list(SCSI_DEVINFO_GLOBAL, NULL);
if (error)
return error;
error = scsi_dev_info_list_add_str(scsi_dev_flags);
if (error)
goto out;
for (i = 0; scsi_static_device_list[i].vendor; i++) {
error = scsi_dev_info_list_add(1 /* compatibile */,
scsi_static_device_list[i].vendor,
scsi_static_device_list[i].model,
NULL,
scsi_static_device_list[i].flags);
if (error)
goto out;
}
#ifdef CONFIG_SCSI_PROC_FS
p = proc_create("scsi/device_info", 0, NULL, &scsi_devinfo_proc_fops);
if (!p) {
error = -ENOMEM;
goto out;
}
#endif /* CONFIG_SCSI_PROC_FS */
out:
if (error)
scsi_exit_devinfo();
return error;
}
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