xref: /linux/drivers/scsi/scsi_devinfo.c (revision 84b9b44b)
1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <linux/blkdev.h>
4 #include <linux/init.h>
5 #include <linux/kernel.h>
6 #include <linux/module.h>
7 #include <linux/moduleparam.h>
8 #include <linux/proc_fs.h>
9 #include <linux/seq_file.h>
10 #include <linux/slab.h>
11 
12 #include <scsi/scsi_device.h>
13 #include <scsi/scsi_devinfo.h>
14 
15 #include "scsi_priv.h"
16 
17 
18 /*
19  * scsi_dev_info_list: structure to hold black/white listed devices.
20  */
21 struct scsi_dev_info_list {
22 	struct list_head dev_info_list;
23 	char vendor[8];
24 	char model[16];
25 	blist_flags_t flags;
26 	unsigned compatible; /* for use with scsi_static_device_list entries */
27 };
28 
29 struct scsi_dev_info_list_table {
30 	struct list_head node;	/* our node for being on the master list */
31 	struct list_head scsi_dev_info_list; /* head of dev info list */
32 	const char *name;	/* name of list for /proc (NULL for global) */
33 	int key;		/* unique numeric identifier */
34 };
35 
36 
37 static blist_flags_t scsi_default_dev_flags;
38 static LIST_HEAD(scsi_dev_info_list);
39 static char scsi_dev_flags[256];
40 
41 /*
42  * scsi_static_device_list: deprecated list of devices that require
43  * settings that differ from the default, includes black-listed (broken)
44  * devices. The entries here are added to the tail of scsi_dev_info_list
45  * via scsi_dev_info_list_init.
46  *
47  * Do not add to this list, use the command line or proc interface to add
48  * to the scsi_dev_info_list. This table will eventually go away.
49  */
50 static struct {
51 	char *vendor;
52 	char *model;
53 	char *revision;	/* revision known to be bad, unused */
54 	blist_flags_t flags;
55 } scsi_static_device_list[] __initdata = {
56 	/*
57 	 * The following devices are known not to tolerate a lun != 0 scan
58 	 * for one reason or another. Some will respond to all luns,
59 	 * others will lock up.
60 	 */
61 	{"Aashima", "IMAGERY 2400SP", "1.03", BLIST_NOLUN},	/* locks up */
62 	{"CHINON", "CD-ROM CDS-431", "H42", BLIST_NOLUN},	/* locks up */
63 	{"CHINON", "CD-ROM CDS-535", "Q14", BLIST_NOLUN},	/* locks up */
64 	{"DENON", "DRD-25X", "V", BLIST_NOLUN},			/* locks up */
65 	{"HITACHI", "DK312C", "CM81", BLIST_NOLUN},	/* responds to all lun */
66 	{"HITACHI", "DK314C", "CR21", BLIST_NOLUN},	/* responds to all lun */
67 	{"IBM", "2104-DU3", NULL, BLIST_NOLUN},		/* locks up */
68 	{"IBM", "2104-TU3", NULL, BLIST_NOLUN},		/* locks up */
69 	{"IMS", "CDD521/10", "2.06", BLIST_NOLUN},	/* locks up */
70 	{"MAXTOR", "XT-3280", "PR02", BLIST_NOLUN},	/* locks up */
71 	{"MAXTOR", "XT-4380S", "B3C", BLIST_NOLUN},	/* locks up */
72 	{"MAXTOR", "MXT-1240S", "I1.2", BLIST_NOLUN},	/* locks up */
73 	{"MAXTOR", "XT-4170S", "B5A", BLIST_NOLUN},	/* locks up */
74 	{"MAXTOR", "XT-8760S", "B7B", BLIST_NOLUN},	/* locks up */
75 	{"MEDIAVIS", "RENO CD-ROMX2A", "2.03", BLIST_NOLUN},	/* responds to all lun */
76 	{"MICROTEK", "ScanMakerIII", "2.30", BLIST_NOLUN},	/* responds to all lun */
77 	{"NEC", "CD-ROM DRIVE:841", "1.0", BLIST_NOLUN},/* locks up */
78 	{"PHILIPS", "PCA80SC", "V4-2", BLIST_NOLUN},	/* responds to all lun */
79 	{"RODIME", "RO3000S", "2.33", BLIST_NOLUN},	/* locks up */
80 	{"SUN", "SENA", NULL, BLIST_NOLUN},		/* responds to all luns */
81 	/*
82 	 * The following causes a failed REQUEST SENSE on lun 1 for
83 	 * aha152x controller, which causes SCSI code to reset bus.
84 	 */
85 	{"SANYO", "CRD-250S", "1.20", BLIST_NOLUN},
86 	/*
87 	 * The following causes a failed REQUEST SENSE on lun 1 for
88 	 * aha152x controller, which causes SCSI code to reset bus.
89 	 */
90 	{"SEAGATE", "ST157N", "\004|j", BLIST_NOLUN},
91 	{"SEAGATE", "ST296", "921", BLIST_NOLUN},	/* responds to all lun */
92 	{"SEAGATE", "ST1581", "6538", BLIST_NOLUN},	/* responds to all lun */
93 	{"SONY", "CD-ROM CDU-541", "4.3d", BLIST_NOLUN},
94 	{"SONY", "CD-ROM CDU-55S", "1.0i", BLIST_NOLUN},
95 	{"SONY", "CD-ROM CDU-561", "1.7x", BLIST_NOLUN},
96 	{"SONY", "CD-ROM CDU-8012", NULL, BLIST_NOLUN},
97 	{"SONY", "SDT-5000", "3.17", BLIST_SELECT_NO_ATN},
98 	{"TANDBERG", "TDC 3600", "U07", BLIST_NOLUN},	/* locks up */
99 	{"TEAC", "CD-R55S", "1.0H", BLIST_NOLUN},	/* locks up */
100 	/*
101 	 * The following causes a failed REQUEST SENSE on lun 1 for
102 	 * seagate controller, which causes SCSI code to reset bus.
103 	 */
104 	{"TEAC", "CD-ROM", "1.06", BLIST_NOLUN},
105 	{"TEAC", "MT-2ST/45S2-27", "RV M", BLIST_NOLUN},	/* responds to all lun */
106 	/*
107 	 * The following causes a failed REQUEST SENSE on lun 1 for
108 	 * seagate controller, which causes SCSI code to reset bus.
109 	 */
110 	{"HP", "C1750A", "3226", BLIST_NOLUN},		/* scanjet iic */
111 	{"HP", "C1790A", NULL, BLIST_NOLUN},		/* scanjet iip */
112 	{"HP", "C2500A", NULL, BLIST_NOLUN},		/* scanjet iicx */
113 	{"MEDIAVIS", "CDR-H93MV", "1.31", BLIST_NOLUN},	/* locks up */
114 	{"MICROTEK", "ScanMaker II", "5.61", BLIST_NOLUN},	/* responds to all lun */
115 	{"MITSUMI", "CD-R CR-2201CS", "6119", BLIST_NOLUN},	/* locks up */
116 	{"NEC", "D3856", "0009", BLIST_NOLUN},
117 	{"QUANTUM", "LPS525S", "3110", BLIST_NOLUN},	/* locks up */
118 	{"QUANTUM", "PD1225S", "3110", BLIST_NOLUN},	/* locks up */
119 	{"QUANTUM", "FIREBALL ST4.3S", "0F0C", BLIST_NOLUN},	/* locks up */
120 	{"RELISYS", "Scorpio", NULL, BLIST_NOLUN},	/* responds to all lun */
121 	{"SANKYO", "CP525", "6.64", BLIST_NOLUN},	/* causes failed REQ SENSE, extra reset */
122 	{"TEXEL", "CD-ROM", "1.06", BLIST_NOLUN | BLIST_BORKEN},
123 	{"transtec", "T5008", "0001", BLIST_NOREPORTLUN },
124 	{"YAMAHA", "CDR100", "1.00", BLIST_NOLUN},	/* locks up */
125 	{"YAMAHA", "CDR102", "1.00", BLIST_NOLUN},	/* locks up */
126 	{"YAMAHA", "CRW8424S", "1.0", BLIST_NOLUN},	/* locks up */
127 	{"YAMAHA", "CRW6416S", "1.0c", BLIST_NOLUN},	/* locks up */
128 	{"", "Scanner", "1.80", BLIST_NOLUN},	/* responds to all lun */
129 
130 	/*
131 	 * Other types of devices that have special flags.
132 	 * Note that all USB devices should have the BLIST_INQUIRY_36 flag.
133 	 */
134 	{"3PARdata", "VV", NULL, BLIST_REPORTLUN2},
135 	{"ADAPTEC", "AACRAID", NULL, BLIST_FORCELUN},
136 	{"ADAPTEC", "Adaptec 5400S", NULL, BLIST_FORCELUN},
137 	{"AIX", "VDASD", NULL, BLIST_TRY_VPD_PAGES | BLIST_NO_VPD_SIZE},
138 	{"AFT PRO", "-IX CF", "0.0>", BLIST_FORCELUN},
139 	{"BELKIN", "USB 2 HS-CF", "1.95",  BLIST_FORCELUN | BLIST_INQUIRY_36},
140 	{"BROWNIE", "1200U3P", NULL, BLIST_NOREPORTLUN},
141 	{"BROWNIE", "1600U3P", NULL, BLIST_NOREPORTLUN},
142 	{"CANON", "IPUBJD", NULL, BLIST_SPARSELUN},
143 	{"CBOX3", "USB Storage-SMC", "300A", BLIST_FORCELUN | BLIST_INQUIRY_36},
144 	{"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},	/* CMD RAID Controller */
145 	{"CNSI", "G7324", NULL, BLIST_SPARSELUN},	/* Chaparral G7324 RAID */
146 	{"CNSi", "G8324", NULL, BLIST_SPARSELUN},	/* Chaparral G8324 RAID */
147 	{"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
148 		BLIST_MAX_512 | BLIST_REPORTLUN2},	/* Compaq RA4x00 */
149 	{"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
150 	{"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
151 	{"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
152 	{"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
153 	{"COMPAQ", "HSV110", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
154 	{"DDN", "SAN DataDirector", "*", BLIST_SPARSELUN},
155 	{"DEC", "HSG80", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
156 	{"DELL", "PV660F", NULL, BLIST_SPARSELUN},
157 	{"DELL", "PV660F   PSEUDO", NULL, BLIST_SPARSELUN},
158 	{"DELL", "PSEUDO DEVICE .", NULL, BLIST_SPARSELUN},	/* Dell PV 530F */
159 	{"DELL", "PV530F", NULL, BLIST_SPARSELUN},
160 	{"DELL", "PERCRAID", NULL, BLIST_FORCELUN},
161 	{"DGC", "RAID", NULL, BLIST_SPARSELUN},	/* EMC CLARiiON, storage on LUN 0 */
162 	{"DGC", "DISK", NULL, BLIST_SPARSELUN},	/* EMC CLARiiON, no storage on LUN 0 */
163 	{"EMC",  "Invista", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
164 	{"EMC", "SYMMETRIX", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
165 	 BLIST_REPORTLUN2 | BLIST_RETRY_ITF},
166 	{"EMULEX", "MD21/S2     ESDI", NULL, BLIST_SINGLELUN},
167 	{"easyRAID", "16P", NULL, BLIST_NOREPORTLUN},
168 	{"easyRAID", "X6P", NULL, BLIST_NOREPORTLUN},
169 	{"easyRAID", "F8", NULL, BLIST_NOREPORTLUN},
170 	{"FSC", "CentricStor", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
171 	{"FUJITSU", "ETERNUS_DXM", "*", BLIST_RETRY_ASC_C1},
172 	{"Generic", "USB SD Reader", "1.00", BLIST_FORCELUN | BLIST_INQUIRY_36},
173 	{"Generic", "USB Storage-SMC", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36}, /* FW: 0180 and 0207 */
174 	{"Generic", "Ultra HS-SD/MMC", "2.09", BLIST_IGN_MEDIA_CHANGE | BLIST_INQUIRY_36},
175 	{"HITACHI", "DF400", "*", BLIST_REPORTLUN2},
176 	{"HITACHI", "DF500", "*", BLIST_REPORTLUN2},
177 	{"HITACHI", "DISK-SUBSYSTEM", "*", BLIST_REPORTLUN2},
178 	{"HITACHI", "HUS1530", "*", BLIST_NO_DIF},
179 	{"HITACHI", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES},
180 	{"HP", "A6189A", NULL, BLIST_SPARSELUN | BLIST_LARGELUN},	/* HP VA7400 */
181 	{"HP", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES}, /* HP XP Arrays */
182 	{"HP", "NetRAID-4M", NULL, BLIST_FORCELUN},
183 	{"HP", "HSV100", NULL, BLIST_REPORTLUN2 | BLIST_NOSTARTONADD},
184 	{"HP", "C1557A", NULL, BLIST_FORCELUN},
185 	{"HP", "C3323-300", "4269", BLIST_NOTQ},
186 	{"HP", "C5713A", NULL, BLIST_NOREPORTLUN},
187 	{"HP", "DISK-SUBSYSTEM", "*", BLIST_REPORTLUN2},
188 	{"HPE", "OPEN-", "*", BLIST_REPORTLUN2 | BLIST_TRY_VPD_PAGES},
189 	{"IBM", "AuSaV1S2", NULL, BLIST_FORCELUN},
190 	{"IBM", "ProFibre 4000R", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
191 	{"IBM", "2076", NULL, BLIST_NO_VPD_SIZE},
192 	{"IBM", "2105", NULL, BLIST_RETRY_HWERROR},
193 	{"iomega", "jaz 1GB", "J.86", BLIST_NOTQ | BLIST_NOLUN},
194 	{"IOMEGA", "ZIP", NULL, BLIST_NOTQ | BLIST_NOLUN},
195 	{"IOMEGA", "Io20S         *F", NULL, BLIST_KEY},
196 	{"INSITE", "Floptical   F*8I", NULL, BLIST_KEY},
197 	{"INSITE", "I325VM", NULL, BLIST_KEY},
198 	{"Intel", "Multi-Flex", NULL, BLIST_NO_RSOC},
199 	{"iRiver", "iFP Mass Driver", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
200 	{"LASOUND", "CDX7405", "3.10", BLIST_MAX5LUN | BLIST_SINGLELUN},
201 	{"Marvell", "Console", NULL, BLIST_SKIP_VPD_PAGES},
202 	{"Marvell", "91xx Config", "1.01", BLIST_SKIP_VPD_PAGES},
203 	{"MATSHITA", "PD-1", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
204 	{"MATSHITA", "DMC-LC5", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
205 	{"MATSHITA", "DMC-LC40", NULL, BLIST_NOT_LOCKABLE | BLIST_INQUIRY_36},
206 	{"Medion", "Flash XL  MMC/SD", "2.6D", BLIST_FORCELUN},
207 	{"MegaRAID", "LD", NULL, BLIST_FORCELUN},
208 	{"MICROP", "4110", NULL, BLIST_NOTQ},
209 	{"MSFT", "Virtual HD", NULL, BLIST_MAX_1024 | BLIST_NO_RSOC},
210 	{"MYLEX", "DACARMRB", "*", BLIST_REPORTLUN2},
211 	{"nCipher", "Fastness Crypto", NULL, BLIST_FORCELUN},
212 	{"NAKAMICH", "MJ-4.8S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
213 	{"NAKAMICH", "MJ-5.16S", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
214 	{"NEC", "PD-1 ODX654P", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
215 	{"NEC", "iStorage", NULL, BLIST_REPORTLUN2},
216 	{"NRC", "MBR-7", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
217 	{"NRC", "MBR-7.4", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
218 	{"PIONEER", "CD-ROM DRM-600", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
219 	{"PIONEER", "CD-ROM DRM-602X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
220 	{"PIONEER", "CD-ROM DRM-604X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
221 	{"PIONEER", "CD-ROM DRM-624X", NULL, BLIST_FORCELUN | BLIST_SINGLELUN},
222 	{"Promise", "VTrak E610f", NULL, BLIST_SPARSELUN | BLIST_NO_RSOC},
223 	{"Promise", "", NULL, BLIST_SPARSELUN},
224 	{"QEMU", "QEMU CD-ROM", NULL, BLIST_SKIP_VPD_PAGES},
225 	{"QNAP", "iSCSI Storage", NULL, BLIST_MAX_1024},
226 	{"SYNOLOGY", "iSCSI Storage", NULL, BLIST_MAX_1024},
227 	{"QUANTUM", "XP34301", "1071", BLIST_NOTQ},
228 	{"REGAL", "CDC-4X", NULL, BLIST_MAX5LUN | BLIST_SINGLELUN},
229 	{"SanDisk", "ImageMate CF-SD1", NULL, BLIST_FORCELUN},
230 	{"SEAGATE", "ST34555N", "0930", BLIST_NOTQ},	/* Chokes on tagged INQUIRY */
231 	{"SEAGATE", "ST3390N", "9546", BLIST_NOTQ},
232 	{"SEAGATE", "ST900MM0006", NULL, BLIST_SKIP_VPD_PAGES},
233 	{"SGI", "RAID3", "*", BLIST_SPARSELUN},
234 	{"SGI", "RAID5", "*", BLIST_SPARSELUN},
235 	{"SGI", "TP9100", "*", BLIST_REPORTLUN2},
236 	{"SGI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
237 	{"SKhynix", "H28U74301AMR", NULL, BLIST_SKIP_VPD_PAGES},
238 	{"IBM", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
239 	{"SUN", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
240 	{"DELL", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
241 	{"STK", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
242 	{"NETAPP", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
243 	{"LSI", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
244 	{"ENGENIO", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
245 	{"LENOVO", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
246 	{"FUJITSU", "Universal Xport", "*", BLIST_NO_ULD_ATTACH},
247 	{"SanDisk", "Cruzer Blade", NULL, BLIST_TRY_VPD_PAGES |
248 		BLIST_INQUIRY_36},
249 	{"SMSC", "USB 2 HS-CF", NULL, BLIST_SPARSELUN | BLIST_INQUIRY_36},
250 	{"SONY", "CD-ROM CDU-8001", NULL, BLIST_BORKEN},
251 	{"SONY", "TSL", NULL, BLIST_FORCELUN},		/* DDS3 & DDS4 autoloaders */
252 	{"ST650211", "CF", NULL, BLIST_RETRY_HWERROR},
253 	{"SUN", "T300", "*", BLIST_SPARSELUN},
254 	{"SUN", "T4", "*", BLIST_SPARSELUN},
255 	{"Tornado-", "F4", "*", BLIST_NOREPORTLUN},
256 	{"TOSHIBA", "CDROM", NULL, BLIST_ISROM},
257 	{"TOSHIBA", "CD-ROM", NULL, BLIST_ISROM},
258 	{"Traxdata", "CDR4120", NULL, BLIST_NOLUN},	/* locks up */
259 	{"USB2.0", "SMARTMEDIA/XD", NULL, BLIST_FORCELUN | BLIST_INQUIRY_36},
260 	{"WangDAT", "Model 2600", "01.7", BLIST_SELECT_NO_ATN},
261 	{"WangDAT", "Model 3200", "02.2", BLIST_SELECT_NO_ATN},
262 	{"WangDAT", "Model 1300", "02.4", BLIST_SELECT_NO_ATN},
263 	{"WDC WD25", "00JB-00FUA0", NULL, BLIST_NOREPORTLUN},
264 	{"XYRATEX", "RS", "*", BLIST_SPARSELUN | BLIST_LARGELUN},
265 	{"Zzyzx", "RocketStor 500S", NULL, BLIST_SPARSELUN},
266 	{"Zzyzx", "RocketStor 2000", NULL, BLIST_SPARSELUN},
267 	{ NULL, NULL, NULL, 0 },
268 };
269 
270 static struct scsi_dev_info_list_table *scsi_devinfo_lookup_by_key(int key)
271 {
272 	struct scsi_dev_info_list_table *devinfo_table;
273 	int found = 0;
274 
275 	list_for_each_entry(devinfo_table, &scsi_dev_info_list, node)
276 		if (devinfo_table->key == key) {
277 			found = 1;
278 			break;
279 		}
280 	if (!found)
281 		return ERR_PTR(-EINVAL);
282 
283 	return devinfo_table;
284 }
285 
286 /*
287  * scsi_strcpy_devinfo: called from scsi_dev_info_list_add to copy into
288  * devinfo vendor and model strings.
289  */
290 static void scsi_strcpy_devinfo(char *name, char *to, size_t to_length,
291 				char *from, int compatible)
292 {
293 	size_t from_length;
294 
295 	from_length = strlen(from);
296 	/* This zero-pads the destination */
297 	strncpy(to, from, to_length);
298 	if (from_length < to_length && !compatible) {
299 		/*
300 		 * space pad the string if it is short.
301 		 */
302 		memset(&to[from_length], ' ', to_length - from_length);
303 	}
304 	if (from_length > to_length)
305 		 printk(KERN_WARNING "%s: %s string '%s' is too long\n",
306 			__func__, name, from);
307 }
308 
309 /**
310  * scsi_dev_info_list_add - add one dev_info list entry.
311  * @compatible: if true, null terminate short strings.  Otherwise space pad.
312  * @vendor:	vendor string
313  * @model:	model (product) string
314  * @strflags:	integer string
315  * @flags:	if strflags NULL, use this flag value
316  *
317  * Description:
318  *	Create and add one dev_info entry for @vendor, @model, @strflags or
319  *	@flag. If @compatible, add to the tail of the list, do not space
320  *	pad, and set devinfo->compatible. The scsi_static_device_list entries
321  *	are added with @compatible 1 and @clfags NULL.
322  *
323  * Returns: 0 OK, -error on failure.
324  **/
325 static int scsi_dev_info_list_add(int compatible, char *vendor, char *model,
326 			    char *strflags, blist_flags_t flags)
327 {
328 	return scsi_dev_info_list_add_keyed(compatible, vendor, model,
329 					    strflags, flags,
330 					    SCSI_DEVINFO_GLOBAL);
331 }
332 
333 /**
334  * scsi_dev_info_list_add_keyed - add one dev_info list entry.
335  * @compatible: if true, null terminate short strings.  Otherwise space pad.
336  * @vendor:	vendor string
337  * @model:	model (product) string
338  * @strflags:	integer string
339  * @flags:	if strflags NULL, use this flag value
340  * @key:	specify list to use
341  *
342  * Description:
343  *	Create and add one dev_info entry for @vendor, @model,
344  *	@strflags or @flag in list specified by @key. If @compatible,
345  *	add to the tail of the list, do not space pad, and set
346  *	devinfo->compatible. The scsi_static_device_list entries are
347  *	added with @compatible 1 and @clfags NULL.
348  *
349  * Returns: 0 OK, -error on failure.
350  **/
351 int scsi_dev_info_list_add_keyed(int compatible, char *vendor, char *model,
352 				 char *strflags, blist_flags_t flags,
353 				 enum scsi_devinfo_key key)
354 {
355 	struct scsi_dev_info_list *devinfo;
356 	struct scsi_dev_info_list_table *devinfo_table =
357 		scsi_devinfo_lookup_by_key(key);
358 
359 	if (IS_ERR(devinfo_table))
360 		return PTR_ERR(devinfo_table);
361 
362 	devinfo = kmalloc(sizeof(*devinfo), GFP_KERNEL);
363 	if (!devinfo) {
364 		printk(KERN_ERR "%s: no memory\n", __func__);
365 		return -ENOMEM;
366 	}
367 
368 	scsi_strcpy_devinfo("vendor", devinfo->vendor, sizeof(devinfo->vendor),
369 			    vendor, compatible);
370 	scsi_strcpy_devinfo("model", devinfo->model, sizeof(devinfo->model),
371 			    model, compatible);
372 
373 	if (strflags) {
374 		unsigned long long val;
375 		int ret = kstrtoull(strflags, 0, &val);
376 
377 		if (ret != 0) {
378 			kfree(devinfo);
379 			return ret;
380 		}
381 		flags = (__force blist_flags_t)val;
382 	}
383 	if (flags & __BLIST_UNUSED_MASK) {
384 		pr_err("scsi_devinfo (%s:%s): unsupported flags 0x%llx",
385 		       vendor, model, flags & __BLIST_UNUSED_MASK);
386 		kfree(devinfo);
387 		return -EINVAL;
388 	}
389 	devinfo->flags = flags;
390 	devinfo->compatible = compatible;
391 
392 	if (compatible)
393 		list_add_tail(&devinfo->dev_info_list,
394 			      &devinfo_table->scsi_dev_info_list);
395 	else
396 		list_add(&devinfo->dev_info_list,
397 			 &devinfo_table->scsi_dev_info_list);
398 
399 	return 0;
400 }
401 EXPORT_SYMBOL(scsi_dev_info_list_add_keyed);
402 
403 /**
404  * scsi_dev_info_list_find - find a matching dev_info list entry.
405  * @vendor:	full vendor string
406  * @model:	full model (product) string
407  * @key:	specify list to use
408  *
409  * Description:
410  *	Finds the first dev_info entry matching @vendor, @model
411  *	in list specified by @key.
412  *
413  * Returns: pointer to matching entry, or ERR_PTR on failure.
414  **/
415 static struct scsi_dev_info_list *scsi_dev_info_list_find(const char *vendor,
416 		const char *model, enum scsi_devinfo_key key)
417 {
418 	struct scsi_dev_info_list *devinfo;
419 	struct scsi_dev_info_list_table *devinfo_table =
420 		scsi_devinfo_lookup_by_key(key);
421 	size_t vmax, mmax, mlen;
422 	const char *vskip, *mskip;
423 
424 	if (IS_ERR(devinfo_table))
425 		return (struct scsi_dev_info_list *) devinfo_table;
426 
427 	/* Prepare for "compatible" matches */
428 
429 	/*
430 	 * XXX why skip leading spaces? If an odd INQUIRY
431 	 * value, that should have been part of the
432 	 * scsi_static_device_list[] entry, such as "  FOO"
433 	 * rather than "FOO". Since this code is already
434 	 * here, and we don't know what device it is
435 	 * trying to work with, leave it as-is.
436 	 */
437 	vmax = sizeof(devinfo->vendor);
438 	vskip = vendor;
439 	while (vmax > 0 && *vskip == ' ') {
440 		vmax--;
441 		vskip++;
442 	}
443 	/* Also skip trailing spaces */
444 	while (vmax > 0 && vskip[vmax - 1] == ' ')
445 		--vmax;
446 
447 	mmax = sizeof(devinfo->model);
448 	mskip = model;
449 	while (mmax > 0 && *mskip == ' ') {
450 		mmax--;
451 		mskip++;
452 	}
453 	while (mmax > 0 && mskip[mmax - 1] == ' ')
454 		--mmax;
455 
456 	list_for_each_entry(devinfo, &devinfo_table->scsi_dev_info_list,
457 			    dev_info_list) {
458 		if (devinfo->compatible) {
459 			/*
460 			 * vendor strings must be an exact match
461 			 */
462 			if (vmax != strnlen(devinfo->vendor,
463 					    sizeof(devinfo->vendor)) ||
464 			    memcmp(devinfo->vendor, vskip, vmax))
465 				continue;
466 
467 			/*
468 			 * @model specifies the full string, and
469 			 * must be larger or equal to devinfo->model
470 			 */
471 			mlen = strnlen(devinfo->model, sizeof(devinfo->model));
472 			if (mmax < mlen || memcmp(devinfo->model, mskip, mlen))
473 				continue;
474 			return devinfo;
475 		} else {
476 			if (!memcmp(devinfo->vendor, vendor,
477 				    sizeof(devinfo->vendor)) &&
478 			    !memcmp(devinfo->model, model,
479 				    sizeof(devinfo->model)))
480 				return devinfo;
481 		}
482 	}
483 
484 	return ERR_PTR(-ENOENT);
485 }
486 
487 /**
488  * scsi_dev_info_list_del_keyed - remove one dev_info list entry.
489  * @vendor:	vendor string
490  * @model:	model (product) string
491  * @key:	specify list to use
492  *
493  * Description:
494  *	Remove and destroy one dev_info entry for @vendor, @model
495  *	in list specified by @key.
496  *
497  * Returns: 0 OK, -error on failure.
498  **/
499 int scsi_dev_info_list_del_keyed(char *vendor, char *model,
500 				 enum scsi_devinfo_key key)
501 {
502 	struct scsi_dev_info_list *found;
503 
504 	found = scsi_dev_info_list_find(vendor, model, key);
505 	if (IS_ERR(found))
506 		return PTR_ERR(found);
507 
508 	list_del(&found->dev_info_list);
509 	kfree(found);
510 	return 0;
511 }
512 EXPORT_SYMBOL(scsi_dev_info_list_del_keyed);
513 
514 /**
515  * scsi_dev_info_list_add_str - parse dev_list and add to the scsi_dev_info_list.
516  * @dev_list:	string of device flags to add
517  *
518  * Description:
519  *	Parse dev_list, and add entries to the scsi_dev_info_list.
520  *	dev_list is of the form "vendor:product:flag,vendor:product:flag".
521  *	dev_list is modified via strsep. Can be called for command line
522  *	addition, for proc or mabye a sysfs interface.
523  *
524  * Returns: 0 if OK, -error on failure.
525  **/
526 static int scsi_dev_info_list_add_str(char *dev_list)
527 {
528 	char *vendor, *model, *strflags, *next;
529 	char *next_check;
530 	int res = 0;
531 
532 	next = dev_list;
533 	if (next && next[0] == '"') {
534 		/*
535 		 * Ignore both the leading and trailing quote.
536 		 */
537 		next++;
538 		next_check = ",\"";
539 	} else {
540 		next_check = ",";
541 	}
542 
543 	/*
544 	 * For the leading and trailing '"' case, the for loop comes
545 	 * through the last time with vendor[0] == '\0'.
546 	 */
547 	for (vendor = strsep(&next, ":"); vendor && (vendor[0] != '\0')
548 	     && (res == 0); vendor = strsep(&next, ":")) {
549 		strflags = NULL;
550 		model = strsep(&next, ":");
551 		if (model)
552 			strflags = strsep(&next, next_check);
553 		if (!model || !strflags) {
554 			printk(KERN_ERR "%s: bad dev info string '%s' '%s'"
555 			       " '%s'\n", __func__, vendor, model,
556 			       strflags);
557 			res = -EINVAL;
558 		} else
559 			res = scsi_dev_info_list_add(0 /* compatible */, vendor,
560 						     model, strflags, 0);
561 	}
562 	return res;
563 }
564 
565 /**
566  * scsi_get_device_flags - get device specific flags from the dynamic
567  *	device list.
568  * @sdev:       &scsi_device to get flags for
569  * @vendor:	vendor name
570  * @model:	model name
571  *
572  * Description:
573  *     Search the global scsi_dev_info_list (specified by list zero)
574  *     for an entry matching @vendor and @model, if found, return the
575  *     matching flags value, else return the host or global default
576  *     settings.  Called during scan time.
577  **/
578 blist_flags_t scsi_get_device_flags(struct scsi_device *sdev,
579 				    const unsigned char *vendor,
580 				    const unsigned char *model)
581 {
582 	return scsi_get_device_flags_keyed(sdev, vendor, model,
583 					   SCSI_DEVINFO_GLOBAL);
584 }
585 
586 
587 /**
588  * scsi_get_device_flags_keyed - get device specific flags from the dynamic device list
589  * @sdev:       &scsi_device to get flags for
590  * @vendor:	vendor name
591  * @model:	model name
592  * @key:	list to look up
593  *
594  * Description:
595  *     Search the scsi_dev_info_list specified by @key for an entry
596  *     matching @vendor and @model, if found, return the matching
597  *     flags value, else return the host or global default settings.
598  *     Called during scan time.
599  **/
600 blist_flags_t scsi_get_device_flags_keyed(struct scsi_device *sdev,
601 				const unsigned char *vendor,
602 				const unsigned char *model,
603 				enum scsi_devinfo_key key)
604 {
605 	struct scsi_dev_info_list *devinfo;
606 
607 	devinfo = scsi_dev_info_list_find(vendor, model, key);
608 	if (!IS_ERR(devinfo))
609 		return devinfo->flags;
610 
611 	/* key or device not found: return nothing */
612 	if (key != SCSI_DEVINFO_GLOBAL)
613 		return 0;
614 
615 	/* except for the global list, where we have an exception */
616 	if (sdev->sdev_bflags)
617 		return sdev->sdev_bflags;
618 
619 	return scsi_default_dev_flags;
620 }
621 EXPORT_SYMBOL(scsi_get_device_flags_keyed);
622 
623 #ifdef CONFIG_SCSI_PROC_FS
624 struct double_list {
625 	struct list_head *top;
626 	struct list_head *bottom;
627 };
628 
629 static int devinfo_seq_show(struct seq_file *m, void *v)
630 {
631 	struct double_list *dl = v;
632 	struct scsi_dev_info_list_table *devinfo_table =
633 		list_entry(dl->top, struct scsi_dev_info_list_table, node);
634 	struct scsi_dev_info_list *devinfo =
635 		list_entry(dl->bottom, struct scsi_dev_info_list,
636 			   dev_info_list);
637 
638 	if (devinfo_table->scsi_dev_info_list.next == dl->bottom &&
639 	    devinfo_table->name)
640 		seq_printf(m, "[%s]:\n", devinfo_table->name);
641 
642 	seq_printf(m, "'%.8s' '%.16s' 0x%llx\n",
643 		   devinfo->vendor, devinfo->model, devinfo->flags);
644 	return 0;
645 }
646 
647 static void *devinfo_seq_start(struct seq_file *m, loff_t *ppos)
648 {
649 	struct double_list *dl = kmalloc(sizeof(*dl), GFP_KERNEL);
650 	loff_t pos = *ppos;
651 
652 	if (!dl)
653 		return NULL;
654 
655 	list_for_each(dl->top, &scsi_dev_info_list) {
656 		struct scsi_dev_info_list_table *devinfo_table =
657 			list_entry(dl->top, struct scsi_dev_info_list_table,
658 				   node);
659 		list_for_each(dl->bottom, &devinfo_table->scsi_dev_info_list)
660 			if (pos-- == 0)
661 				return dl;
662 	}
663 
664 	kfree(dl);
665 	return NULL;
666 }
667 
668 static void *devinfo_seq_next(struct seq_file *m, void *v, loff_t *ppos)
669 {
670 	struct double_list *dl = v;
671 	struct scsi_dev_info_list_table *devinfo_table =
672 		list_entry(dl->top, struct scsi_dev_info_list_table, node);
673 
674 	++*ppos;
675 	dl->bottom = dl->bottom->next;
676 	while (&devinfo_table->scsi_dev_info_list == dl->bottom) {
677 		dl->top = dl->top->next;
678 		if (dl->top == &scsi_dev_info_list) {
679 			kfree(dl);
680 			return NULL;
681 		}
682 		devinfo_table = list_entry(dl->top,
683 					   struct scsi_dev_info_list_table,
684 					   node);
685 		dl->bottom = devinfo_table->scsi_dev_info_list.next;
686 	}
687 
688 	return dl;
689 }
690 
691 static void devinfo_seq_stop(struct seq_file *m, void *v)
692 {
693 	kfree(v);
694 }
695 
696 static const struct seq_operations scsi_devinfo_seq_ops = {
697 	.start	= devinfo_seq_start,
698 	.next	= devinfo_seq_next,
699 	.stop	= devinfo_seq_stop,
700 	.show	= devinfo_seq_show,
701 };
702 
703 static int proc_scsi_devinfo_open(struct inode *inode, struct file *file)
704 {
705 	return seq_open(file, &scsi_devinfo_seq_ops);
706 }
707 
708 /*
709  * proc_scsi_dev_info_write - allow additions to scsi_dev_info_list via /proc.
710  *
711  * Description: Adds a black/white list entry for vendor and model with an
712  * integer value of flag to the scsi device info list.
713  * To use, echo "vendor:model:flag" > /proc/scsi/device_info
714  */
715 static ssize_t proc_scsi_devinfo_write(struct file *file,
716 				       const char __user *buf,
717 				       size_t length, loff_t *ppos)
718 {
719 	char *buffer;
720 	ssize_t err = length;
721 
722 	if (!buf || length>PAGE_SIZE)
723 		return -EINVAL;
724 	if (!(buffer = (char *) __get_free_page(GFP_KERNEL)))
725 		return -ENOMEM;
726 	if (copy_from_user(buffer, buf, length)) {
727 		err =-EFAULT;
728 		goto out;
729 	}
730 
731 	if (length < PAGE_SIZE)
732 		buffer[length] = '\0';
733 	else if (buffer[PAGE_SIZE-1]) {
734 		err = -EINVAL;
735 		goto out;
736 	}
737 
738 	scsi_dev_info_list_add_str(buffer);
739 
740 out:
741 	free_page((unsigned long)buffer);
742 	return err;
743 }
744 
745 static const struct proc_ops scsi_devinfo_proc_ops = {
746 	.proc_open	= proc_scsi_devinfo_open,
747 	.proc_read	= seq_read,
748 	.proc_write	= proc_scsi_devinfo_write,
749 	.proc_lseek	= seq_lseek,
750 	.proc_release	= seq_release,
751 };
752 #endif /* CONFIG_SCSI_PROC_FS */
753 
754 module_param_string(dev_flags, scsi_dev_flags, sizeof(scsi_dev_flags), 0);
755 MODULE_PARM_DESC(dev_flags,
756 	 "Given scsi_dev_flags=vendor:model:flags[,v:m:f] add black/white"
757 	 " list entries for vendor and model with an integer value of flags"
758 	 " to the scsi device info list");
759 
760 module_param_named(default_dev_flags, scsi_default_dev_flags, ullong, 0644);
761 MODULE_PARM_DESC(default_dev_flags,
762 		 "scsi default device flag uint64_t value");
763 
764 /**
765  * scsi_exit_devinfo - remove /proc/scsi/device_info & the scsi_dev_info_list
766  **/
767 void scsi_exit_devinfo(void)
768 {
769 #ifdef CONFIG_SCSI_PROC_FS
770 	remove_proc_entry("scsi/device_info", NULL);
771 #endif
772 
773 	scsi_dev_info_remove_list(SCSI_DEVINFO_GLOBAL);
774 }
775 
776 /**
777  * scsi_dev_info_add_list - add a new devinfo list
778  * @key:	key of the list to add
779  * @name:	Name of the list to add (for /proc/scsi/device_info)
780  *
781  * Adds the requested list, returns zero on success, -EEXIST if the
782  * key is already registered to a list, or other error on failure.
783  */
784 int scsi_dev_info_add_list(enum scsi_devinfo_key key, const char *name)
785 {
786 	struct scsi_dev_info_list_table *devinfo_table =
787 		scsi_devinfo_lookup_by_key(key);
788 
789 	if (!IS_ERR(devinfo_table))
790 		/* list already exists */
791 		return -EEXIST;
792 
793 	devinfo_table = kmalloc(sizeof(*devinfo_table), GFP_KERNEL);
794 
795 	if (!devinfo_table)
796 		return -ENOMEM;
797 
798 	INIT_LIST_HEAD(&devinfo_table->node);
799 	INIT_LIST_HEAD(&devinfo_table->scsi_dev_info_list);
800 	devinfo_table->name = name;
801 	devinfo_table->key = key;
802 	list_add_tail(&devinfo_table->node, &scsi_dev_info_list);
803 
804 	return 0;
805 }
806 EXPORT_SYMBOL(scsi_dev_info_add_list);
807 
808 /**
809  * scsi_dev_info_remove_list - destroy an added devinfo list
810  * @key: key of the list to destroy
811  *
812  * Iterates over the entire list first, freeing all the values, then
813  * frees the list itself.  Returns 0 on success or -EINVAL if the key
814  * can't be found.
815  */
816 int scsi_dev_info_remove_list(enum scsi_devinfo_key key)
817 {
818 	struct list_head *lh, *lh_next;
819 	struct scsi_dev_info_list_table *devinfo_table =
820 		scsi_devinfo_lookup_by_key(key);
821 
822 	if (IS_ERR(devinfo_table))
823 		/* no such list */
824 		return -EINVAL;
825 
826 	/* remove from the master list */
827 	list_del(&devinfo_table->node);
828 
829 	list_for_each_safe(lh, lh_next, &devinfo_table->scsi_dev_info_list) {
830 		struct scsi_dev_info_list *devinfo;
831 
832 		devinfo = list_entry(lh, struct scsi_dev_info_list,
833 				     dev_info_list);
834 		kfree(devinfo);
835 	}
836 	kfree(devinfo_table);
837 
838 	return 0;
839 }
840 EXPORT_SYMBOL(scsi_dev_info_remove_list);
841 
842 /**
843  * scsi_init_devinfo - set up the dynamic device list.
844  *
845  * Description:
846  *	Add command line entries from scsi_dev_flags, then add
847  *	scsi_static_device_list entries to the scsi device info list.
848  */
849 int __init scsi_init_devinfo(void)
850 {
851 #ifdef CONFIG_SCSI_PROC_FS
852 	struct proc_dir_entry *p;
853 #endif
854 	int error, i;
855 
856 	error = scsi_dev_info_add_list(SCSI_DEVINFO_GLOBAL, NULL);
857 	if (error)
858 		return error;
859 
860 	error = scsi_dev_info_list_add_str(scsi_dev_flags);
861 	if (error)
862 		goto out;
863 
864 	for (i = 0; scsi_static_device_list[i].vendor; i++) {
865 		error = scsi_dev_info_list_add(1 /* compatibile */,
866 				scsi_static_device_list[i].vendor,
867 				scsi_static_device_list[i].model,
868 				NULL,
869 				scsi_static_device_list[i].flags);
870 		if (error)
871 			goto out;
872 	}
873 
874 #ifdef CONFIG_SCSI_PROC_FS
875 	p = proc_create("scsi/device_info", 0, NULL, &scsi_devinfo_proc_ops);
876 	if (!p) {
877 		error = -ENOMEM;
878 		goto out;
879 	}
880 #endif /* CONFIG_SCSI_PROC_FS */
881 
882  out:
883 	if (error)
884 		scsi_exit_devinfo();
885 	return error;
886 }
887