Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/agpgart
[linux-2.6] / drivers / scsi / scsi_devinfo.c
1
2 #include <linux/blkdev.h>
3 #include <linux/init.h>
4 #include <linux/kernel.h>
5 #include <linux/module.h>
6 #include <linux/moduleparam.h>
7 #include <linux/proc_fs.h>
8 #include <linux/seq_file.h>
9
10 #include <scsi/scsi_device.h>
11 #include <scsi/scsi_devinfo.h>
12
13 #include "scsi_priv.h"
14
15
16 /*
17  * scsi_dev_info_list: structure to hold black/white listed devices.
18  */
19 struct scsi_dev_info_list {
20         struct list_head dev_info_list;
21         char vendor[8];
22         char model[16];
23         unsigned flags;
24         unsigned compatible; /* for use with scsi_static_device_list entries */
25 };
26
27
28 static const char spaces[] = "                "; /* 16 of them */
29 static unsigned scsi_default_dev_flags;
30 static LIST_HEAD(scsi_dev_info_list);
31 static char scsi_dev_flags[256];
32
33 /*
34  * scsi_static_device_list: deprecated list of devices that require
35  * settings that differ from the default, includes black-listed (broken)
36  * devices. The entries here are added to the tail of scsi_dev_info_list
37  * via scsi_dev_info_list_init.
38  *
39  * Do not add to this list, use the command line or proc interface to add
40  * to the scsi_dev_info_list. This table will eventually go away.
41  */
42 static struct {
43         char *vendor;
44         char *model;
45         char *revision; /* revision known to be bad, unused */
46         unsigned flags;
47 } scsi_static_device_list[] __initdata = {
48         /*
49          * The following devices are known not to tolerate a lun != 0 scan
50          * for one reason or another. Some will respond to all luns,
51          * others will lock up.
52          */
53         {"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},     /* locks up */
54         {"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},       /* locks up */
55         {"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},       /* locks up */
56         {"DENON", "DRD-25X", "V", BLIST_NOLUN},                 /* locks up */
57         {"HITACHI", "DK312C", "CM81", BLIST_NOLUN},     /* responds to all lun */
58         {"HITACHI", "DK314C", "CR21", BLIST_NOLUN},     /* responds to all lun */
59         {"IBM", "2104-DU3", NULL, BLIST_NOLUN},         /* locks up */
60         {"IBM", "2104-TU3", NULL, BLIST_NOLUN},         /* locks up */
61         {"IMS", "CDD521/10", "2.06", BLIST_NOLUN},      /* locks up */
62         {"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},     /* locks up */
63         {"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},     /* locks up */
64         {"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},   /* locks up */
65         {"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},     /* locks up */
66         {"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},     /* locks up */
67         {"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},    /* responds to all lun */
68         {"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN},      /* responds to all lun */
69         {"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
70         {"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},    /* responds to all lun */
71         {"RODIME", "RO3000S", "2.33", BLIST_NOLUN},     /* locks up */
72         {"SUN", "SENA", NULL, BLIST_NOLUN},             /* responds to all luns */
73         /*
74          * The following causes a failed REQUEST SENSE on lun 1 for
75          * aha152x controller, which causes SCSI code to reset bus.
76          */
77         {"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
78         /*
79          * The following causes a failed REQUEST SENSE on lun 1 for
80          * aha152x controller, which causes SCSI code to reset bus.
81          */
82         {"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
83         {"SEAGATE", "ST296", "921", BLIST_NOLUN},       /* responds to all lun */
84         {"SEAGATE", "ST1581", "6538", BLIST_NOLUN},     /* responds to all lun */
85         {"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
86         {"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
87         {"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
88         {"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
89         {"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
90         {"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},   /* locks up */
91         {"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},       /* locks up */
92         /*
93          * The following causes a failed REQUEST SENSE on lun 1 for
94          * seagate controller, which causes SCSI code to reset bus.
95          */
96         {"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
97         {"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},        /* responds to all lun */
98         /*
99          * The following causes a failed REQUEST SENSE on lun 1 for
100          * seagate controller, which causes SCSI code to reset bus.
101          */
102         {"HP", "C1750A", "3226", BLIST_NOLUN},          /* scanjet iic */
103         {"HP", "C1790A", "", BLIST_NOLUN},              /* scanjet iip */
104         {"HP", "C2500A", "", BLIST_NOLUN},              /* scanjet iicx */
105         {"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN}, /* locks up */
106         {"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},      /* responds to all lun */
107         {"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},     /* locks up */
108         {"NEC", "D3856", "0009", BLIST_NOLUN},
109         {"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},    /* locks up */
110         {"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},    /* locks up */
111         {"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},    /* locks up */
112         {"RELISYS", "Scorpio", NULL, BLIST_NOLUN},      /* responds to all lun */
113         {"SANKYO", "CP525", "6.64", BLIST_NOLUN},       /* causes failed REQ SENSE, extra reset */
114         {"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN},
115         {"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
116         {"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},      /* locks up */
117         {"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},      /* locks up */
118         {"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},     /* locks up */
119         {"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},    /* locks up */
120         {"", "Scanner", "1.80", BLIST_NOLUN},   /* responds to all lun */
121
122         /*
123          * Other types of devices that have special flags.
124          * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
125          */
126         {"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
127         {"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
128         {"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
129         {"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
130         {"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
131         {"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
132         {"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
133         {"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
134         {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
135         {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
136         {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
137         {"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
138                 BLIST_MAX_512 | BLIST_REPORTLUN2},      /* Compaq RA4x00 */
139         {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
140         {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
141         {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
142         {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
143         {"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
144         {"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
145         {"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
146         {"DELL", "PV660F", NULL, BLIST_SPARSELUN},
147         {"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
148         {"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},     /* Dell PV 530F */
149         {"DELL", "PV530F", NULL, BLIST_SPARSELUN},
150         {"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
151         {"DGC", "RAID", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, storage on LUN 0 */
152         {"DGC", "DISK", NULL, BLIST_SPARSELUN}, /* Dell PV 650F, no storage on LUN 0 */
153         {"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN | BLIST_FORCELUN},
154         {"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
155         {"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
156         {"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
157         {"Generic", "USB Storage-SMC", "0180", BLIST_FORCELUN | BLIST_INQUIRY_36},
158         {"Generic", "USB Storage-SMC", "0207", BLIST_FORCELUN | BLIST_INQUIRY_36},
159         {"HITACHI", "DF400", "*", BLIST_SPARSELUN},
160         {"HITACHI", "DF500", "*", BLIST_SPARSELUN},
161         {"HITACHI", "DF600", "*", BLIST_SPARSELUN},
162         {"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},       /* HP VA7400 */
163         {"HP", "OPEN-", "*", BLIST_SPARSELUN | BLIST_LARGELUN}, /* HP XP Arrays */
164         {"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
165         {"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
166         {"HP", "C1557A", NULL, BLIST_FORCELUN},
167         {"HP", "C3323-300", "4269", BLIST_NOTQ},
168         {"HP", "C5713A", NULL, BLIST_NOREPORTLUN},
169         {"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
170         {"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
171         {"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
172         {"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
173         {"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
174         {"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
175         {"INSITE", "I325VM", NULL, BLIST_KEY},
176         {"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
177         {"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
178         {"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
179         {"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
180         {"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
181         {"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
182         {"MegaRAID", "LD", NULL, BLIST_FORCELUN},
183         {"MICROP", "4110", NULL, BLIST_NOTQ},
184         {"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
185         {"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
186         {"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
187         {"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
188         {"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
189         {"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
190         {"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
191         {"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
192         {"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
193         {"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
194         {"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
195         {"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
196         {"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
197         {"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},    /* Chokes on tagged INQUIRY */
198         {"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
199         {"SGI", "RAID3", "*", BLIST_SPARSELUN},
200         {"SGI", "RAID5", "*", BLIST_SPARSELUN},
201         {"SGI", "TP9100", "*", BLIST_REPORTLUN2},
202         {"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
203         {"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
204         {"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
205         {"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
206         {"SONY", "TSL", NULL, BLIST_FORCELUN},          /* DDS3 & DDS4 autoloaders */
207         {"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
208         {"SUN", "T300", "*", BLIST_SPARSELUN},
209         {"SUN", "T4", "*", BLIST_SPARSELUN},
210         {"TEXEL", "CD-ROM", "1.06", BLIST_BORKEN},
211         {"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
212         {"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
213         {"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
214         {"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
215         {"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
216         {"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
217         {"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
218         {"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
219         {"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
220         {"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
221         { NULL, NULL, NULL, 0 },
222 };
223
224 /*
225  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
226  * devinfo vendor and model strings.
227  */
228 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
229                                 char *from, int compatible)
230 {
231         size_t from_length;
232
233         from_length = strlen(from);
234         strncpy(to, from, min(to_length, from_length));
235         if (from_length < to_length) {
236                 if (compatible) {
237                         /*
238                          * NUL terminate the string if it is short.
239                          */
240                         to[from_length] = '\0';
241                 } else {
242                         /* 
243                          * space pad the string if it is short. 
244                          */
245                         strncpy(&to[from_length], spaces,
246                                 to_length - from_length);
247                 }
248         }
249         if (from_length > to_length)
250                  printk(KERN_WARNING "%s: %s string '%s' is too long\n",
251                         __FUNCTION__, name, from);
252 }
253
254 /**
255  * scsi_dev_info_list_add: add one dev_info list entry.
256  * @vendor:     vendor string
257  * @model:      model (product) string
258  * @strflags:   integer string
259  * @flag:       if strflags NULL, use this flag value
260  *
261  * Description:
262  *      Create and add one dev_info entry for @vendor, @model, @strflags or
263  *      @flag. If @compatible, add to the tail of the list, do not space
264  *      pad, and set devinfo->compatible. The scsi_static_device_list entries
265  *      are added with @compatible 1 and @clfags NULL.
266  *
267  * Returns: 0 OK, -error on failure.
268  **/
269 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
270                             char *strflags, int flags)
271 {
272         struct scsi_dev_info_list *devinfo;
273
274         devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
275         if (!devinfo) {
276                 printk(KERN_ERR "%s: no memory\n", __FUNCTION__);
277                 return -ENOMEM;
278         }
279
280         scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
281                             vendor, compatible);
282         scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
283                             model, compatible);
284
285         if (strflags)
286                 devinfo->flags = simple_strtoul(strflags, NULL, 0);
287         else
288                 devinfo->flags = flags;
289
290         devinfo->compatible = compatible;
291
292         if (compatible)
293                 list_add_tail(&devinfo->dev_info_list, &scsi_dev_info_list);
294         else
295                 list_add(&devinfo->dev_info_list, &scsi_dev_info_list);
296
297         return 0;
298 }
299
300 /**
301  * scsi_dev_info_list_add_str: parse dev_list and add to the
302  * scsi_dev_info_list.
303  * @dev_list:   string of device flags to add
304  *
305  * Description:
306  *      Parse dev_list, and add entries to the scsi_dev_info_list.
307  *      dev_list is of the form "vendor:product:flag,vendor:product:flag".
308  *      dev_list is modified via strsep. Can be called for command line
309  *      addition, for proc or mabye a sysfs interface.
310  *
311  * Returns: 0 if OK, -error on failure.
312  **/
313 static int scsi_dev_info_list_add_str(char *dev_list)
314 {
315         char *vendor, *model, *strflags, *next;
316         char *next_check;
317         int res = 0;
318
319         next = dev_list;
320         if (next && next[0] == '"') {
321                 /*
322                  * Ignore both the leading and trailing quote.
323                  */
324                 next++;
325                 next_check = ",\"";
326         } else {
327                 next_check = ",";
328         }
329
330         /*
331          * For the leading and trailing '"' case, the for loop comes
332          * through the last time with vendor[0] == '\0'.
333          */
334         for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
335              && (res == 0); vendor = strsep(&next, ":")) {
336                 strflags = NULL;
337                 model = strsep(&next, ":");
338                 if (model)
339                         strflags = strsep(&next, next_check);
340                 if (!model || !strflags) {
341                         printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
342                                " '%s'\n", __FUNCTION__, vendor, model,
343                                strflags);
344                         res = -EINVAL;
345                 } else
346                         res = scsi_dev_info_list_add(0 /* compatible */, vendor,
347                                                      model, strflags, 0);
348         }
349         return res;
350 }
351
352 /**
353  * get_device_flags - get device specific flags from the dynamic device
354  * list. Called during scan time.
355  * @vendor:     vendor name
356  * @model:      model name
357  *
358  * Description:
359  *     Search the scsi_dev_info_list for an entry matching @vendor and
360  *     @model, if found, return the matching flags value, else return
361  *     the host or global default settings.
362  **/
363 int scsi_get_device_flags(struct scsi_device *sdev,
364                           const unsigned char *vendor,
365                           const unsigned char *model)
366 {
367         struct scsi_dev_info_list *devinfo;
368         unsigned int bflags;
369
370         bflags = sdev->sdev_bflags;
371         if (!bflags)
372                 bflags = scsi_default_dev_flags;
373
374         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
375                 if (devinfo->compatible) {
376                         /*
377                          * Behave like the older version of get_device_flags.
378                          */
379                         size_t max;
380                         /*
381                          * XXX why skip leading spaces? If an odd INQUIRY
382                          * value, that should have been part of the
383                          * scsi_static_device_list[] entry, such as "  FOO"
384                          * rather than "FOO". Since this code is already
385                          * here, and we don't know what device it is
386                          * trying to work with, leave it as-is.
387                          */
388                         max = 8;        /* max length of vendor */
389                         while ((max > 0) && *vendor == ' ') {
390                                 max--;
391                                 vendor++;
392                         }
393                         /*
394                          * XXX removing the following strlen() would be
395                          * good, using it means that for a an entry not in
396                          * the list, we scan every byte of every vendor
397                          * listed in scsi_static_device_list[], and never match
398                          * a single one (and still have to compare at
399                          * least the first byte of each vendor).
400                          */
401                         if (memcmp(devinfo->vendor, vendor,
402                                     min(max, strlen(devinfo->vendor))))
403                                 continue;
404                         /*
405                          * Skip spaces again.
406                          */
407                         max = 16;       /* max length of model */
408                         while ((max > 0) && *model == ' ') {
409                                 max--;
410                                 model++;
411                         }
412                         if (memcmp(devinfo->model, model,
413                                    min(max, strlen(devinfo->model))))
414                                 continue;
415                         return devinfo->flags;
416                 } else {
417                         if (!memcmp(devinfo->vendor, vendor,
418                                      sizeof(devinfo->vendor)) &&
419                              !memcmp(devinfo->model, model,
420                                       sizeof(devinfo->model)))
421                                 return devinfo->flags;
422                 }
423         }
424         return bflags;
425 }
426
427 #ifdef CONFIG_SCSI_PROC_FS
428 /* 
429  * proc_scsi_dev_info_read: dump the scsi_dev_info_list via
430  * /proc/scsi/device_info
431  */
432 static int proc_scsi_devinfo_read(char *buffer, char **start,
433                                   off_t offset, int length)
434 {
435         struct scsi_dev_info_list *devinfo;
436         int size, len = 0;
437         off_t begin = 0;
438         off_t pos = 0;
439
440         list_for_each_entry(devinfo, &scsi_dev_info_list, dev_info_list) {
441                 size = sprintf(buffer + len, "'%.8s' '%.16s' 0x%x\n",
442                         devinfo->vendor, devinfo->model, devinfo->flags);
443                 len += size;
444                 pos = begin + len;
445                 if (pos < offset) {
446                         len = 0;
447                         begin = pos;
448                 }
449                 if (pos > offset + length)
450                         goto stop_output;
451         }
452
453 stop_output:
454         *start = buffer + (offset - begin);     /* Start of wanted data */
455         len -= (offset - begin);        /* Start slop */
456         if (len > length)
457                 len = length;   /* Ending slop */
458         return (len);
459 }
460
461 /* 
462  * proc_scsi_dev_info_write: allow additions to the scsi_dev_info_list via
463  * /proc.
464  *
465  * Use: echo "vendor:model:flag" > /proc/scsi/device_info
466  *
467  * To add a black/white list entry for vendor and model with an integer
468  * value of flag to the scsi device info list.
469  */
470 static int proc_scsi_devinfo_write(struct file *file, const char __user *buf,
471                                    unsigned long length, void *data)
472 {
473         char *buffer;
474         int err = length;
475
476         if (!buf || length>PAGE_SIZE)
477                 return -EINVAL;
478         if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
479                 return -ENOMEM;
480         if (copy_from_user(buffer, buf, length)) {
481                 err =-EFAULT;
482                 goto out;
483         }
484
485         if (length < PAGE_SIZE)
486                 buffer[length] = '\0';
487         else if (buffer[PAGE_SIZE-1]) {
488                 err = -EINVAL;
489                 goto out;
490         }
491
492         scsi_dev_info_list_add_str(buffer);
493
494 out:
495         free_page((unsigned long)buffer);
496         return err;
497 }
498 #endif /* CONFIG_SCSI_PROC_FS */
499
500 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
501 MODULE_PARM_DESC(dev_flags,
502          "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
503          " list entries for vendor and model with an integer value of flags"
504          " to the scsi device info list");
505
506 module_param_named(default_dev_flags, scsi_default_dev_flags, int, S_IRUGO|S_IWUSR);
507 MODULE_PARM_DESC(default_dev_flags,
508                  "scsi default device flag integer value");
509
510 /**
511  * scsi_dev_info_list_delete: called from scsi.c:exit_scsi to remove
512  *      the scsi_dev_info_list.
513  **/
514 void scsi_exit_devinfo(void)
515 {
516         struct list_head *lh, *lh_next;
517         struct scsi_dev_info_list *devinfo;
518
519 #ifdef CONFIG_SCSI_PROC_FS
520         remove_proc_entry("scsi/device_info", NULL);
521 #endif
522
523         list_for_each_safe(lh, lh_next, &scsi_dev_info_list) {
524                 devinfo = list_entry(lh, struct scsi_dev_info_list,
525                                      dev_info_list);
526                 kfree(devinfo);
527         }
528 }
529
530 /**
531  * scsi_dev_list_init: set up the dynamic device list.
532  * @dev_list:   string of device flags to add
533  *
534  * Description:
535  *      Add command line @dev_list entries, then add
536  *      scsi_static_device_list entries to the scsi device info list.
537  **/
538 int __init scsi_init_devinfo(void)
539 {
540 #ifdef CONFIG_SCSI_PROC_FS
541         struct proc_dir_entry *p;
542 #endif
543         int error, i;
544
545         error = scsi_dev_info_list_add_str(scsi_dev_flags);
546         if (error)
547                 return error;
548
549         for (i = 0; scsi_static_device_list[i].vendor; i++) {
550                 error = scsi_dev_info_list_add(1 /* compatibile */,
551                                 scsi_static_device_list[i].vendor,
552                                 scsi_static_device_list[i].model,
553                                 NULL,
554                                 scsi_static_device_list[i].flags);
555                 if (error)
556                         goto out;
557         }
558
559 #ifdef CONFIG_SCSI_PROC_FS
560         p = create_proc_entry("scsi/device_info", 0, NULL);
561         if (!p) {
562                 error = -ENOMEM;
563                 goto out;
564         }
565
566         p->owner = THIS_MODULE;
567         p->get_info = proc_scsi_devinfo_read;
568         p->write_proc = proc_scsi_devinfo_write;
569 #endif /* CONFIG_SCSI_PROC_FS */
570
571  out:
572         if (error)
573                 scsi_exit_devinfo();
574         return error;
575 }