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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [ieee1394/] [nodemgr.c] - Blame information for rev 65

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Line No. Rev Author Line
1 62 marcus.erl
/*
2
 * Node information (ConfigROM) collection and management.
3
 *
4
 * Copyright (C) 2000           Andreas E. Bombe
5
 *               2001-2003      Ben Collins <bcollins@debian.net>
6
 *
7
 * This code is licensed under the GPL.  See the file COPYING in the root
8
 * directory of the kernel sources for details.
9
 */
10
 
11
#include <linux/bitmap.h>
12
#include <linux/kernel.h>
13
#include <linux/list.h>
14
#include <linux/slab.h>
15
#include <linux/delay.h>
16
#include <linux/kthread.h>
17
#include <linux/module.h>
18
#include <linux/moduleparam.h>
19
#include <linux/mutex.h>
20
#include <linux/freezer.h>
21
#include <asm/atomic.h>
22
#include <asm/semaphore.h>
23
 
24
#include "csr.h"
25
#include "highlevel.h"
26
#include "hosts.h"
27
#include "ieee1394.h"
28
#include "ieee1394_core.h"
29
#include "ieee1394_hotplug.h"
30
#include "ieee1394_types.h"
31
#include "ieee1394_transactions.h"
32
#include "nodemgr.h"
33
 
34
static int ignore_drivers;
35
module_param(ignore_drivers, int, S_IRUGO | S_IWUSR);
36
MODULE_PARM_DESC(ignore_drivers, "Disable automatic probing for drivers.");
37
 
38
struct nodemgr_csr_info {
39
        struct hpsb_host *host;
40
        nodeid_t nodeid;
41
        unsigned int generation;
42
        unsigned int speed_unverified:1;
43
};
44
 
45
 
46
/*
47
 * Correct the speed map entry.  This is necessary
48
 *  - for nodes with link speed < phy speed,
49
 *  - for 1394b nodes with negotiated phy port speed < IEEE1394_SPEED_MAX.
50
 * A possible speed is determined by trial and error, using quadlet reads.
51
 */
52
static int nodemgr_check_speed(struct nodemgr_csr_info *ci, u64 addr,
53
                               quadlet_t *buffer)
54
{
55
        quadlet_t q;
56
        u8 i, *speed, old_speed, good_speed;
57
        int error;
58
 
59
        speed = &(ci->host->speed[NODEID_TO_NODE(ci->nodeid)]);
60
        old_speed = *speed;
61
        good_speed = IEEE1394_SPEED_MAX + 1;
62
 
63
        /* Try every speed from S100 to old_speed.
64
         * If we did it the other way around, a too low speed could be caught
65
         * if the retry succeeded for some other reason, e.g. because the link
66
         * just finished its initialization. */
67
        for (i = IEEE1394_SPEED_100; i <= old_speed; i++) {
68
                *speed = i;
69
                error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
70
                                  &q, sizeof(quadlet_t));
71
                if (error)
72
                        break;
73
                *buffer = q;
74
                good_speed = i;
75
        }
76
        if (good_speed <= IEEE1394_SPEED_MAX) {
77
                HPSB_DEBUG("Speed probe of node " NODE_BUS_FMT " yields %s",
78
                           NODE_BUS_ARGS(ci->host, ci->nodeid),
79
                           hpsb_speedto_str[good_speed]);
80
                *speed = good_speed;
81
                ci->speed_unverified = 0;
82
                return 0;
83
        }
84
        *speed = old_speed;
85
        return error;
86
}
87
 
88
static int nodemgr_bus_read(struct csr1212_csr *csr, u64 addr, u16 length,
89
                            void *buffer, void *__ci)
90
{
91
        struct nodemgr_csr_info *ci = (struct nodemgr_csr_info*)__ci;
92
        int i, error;
93
 
94
        for (i = 1; ; i++) {
95
                error = hpsb_read(ci->host, ci->nodeid, ci->generation, addr,
96
                                  buffer, length);
97
                if (!error) {
98
                        ci->speed_unverified = 0;
99
                        break;
100
                }
101
                /* Give up after 3rd failure. */
102
                if (i == 3)
103
                        break;
104
 
105
                /* The ieee1394_core guessed the node's speed capability from
106
                 * the self ID.  Check whether a lower speed works. */
107
                if (ci->speed_unverified && length == sizeof(quadlet_t)) {
108
                        error = nodemgr_check_speed(ci, addr, buffer);
109
                        if (!error)
110
                                break;
111
                }
112
                if (msleep_interruptible(334))
113
                        return -EINTR;
114
        }
115
        return error;
116
}
117
 
118
static int nodemgr_get_max_rom(quadlet_t *bus_info_data, void *__ci)
119
{
120
        return (be32_to_cpu(bus_info_data[2]) >> 8) & 0x3;
121
}
122
 
123
static struct csr1212_bus_ops nodemgr_csr_ops = {
124
        .bus_read =     nodemgr_bus_read,
125
        .get_max_rom =  nodemgr_get_max_rom
126
};
127
 
128
 
129
/*
130
 * Basically what we do here is start off retrieving the bus_info block.
131
 * From there will fill in some info about the node, verify it is of IEEE
132
 * 1394 type, and that the crc checks out ok. After that we start off with
133
 * the root directory, and subdirectories. To do this, we retrieve the
134
 * quadlet header for a directory, find out the length, and retrieve the
135
 * complete directory entry (be it a leaf or a directory). We then process
136
 * it and add the info to our structure for that particular node.
137
 *
138
 * We verify CRC's along the way for each directory/block/leaf. The entire
139
 * node structure is generic, and simply stores the information in a way
140
 * that's easy to parse by the protocol interface.
141
 */
142
 
143
/*
144
 * The nodemgr relies heavily on the Driver Model for device callbacks and
145
 * driver/device mappings. The old nodemgr used to handle all this itself,
146
 * but now we are much simpler because of the LDM.
147
 */
148
 
149
struct host_info {
150
        struct hpsb_host *host;
151
        struct list_head list;
152
        struct task_struct *thread;
153
};
154
 
155
static int nodemgr_bus_match(struct device * dev, struct device_driver * drv);
156
static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env);
157
static void nodemgr_resume_ne(struct node_entry *ne);
158
static void nodemgr_remove_ne(struct node_entry *ne);
159
static struct node_entry *find_entry_by_guid(u64 guid);
160
 
161
struct bus_type ieee1394_bus_type = {
162
        .name           = "ieee1394",
163
        .match          = nodemgr_bus_match,
164
};
165
 
166
static void host_cls_release(struct device *dev)
167
{
168
        put_device(&container_of((dev), struct hpsb_host, host_dev)->device);
169
}
170
 
171
struct class hpsb_host_class = {
172
        .name           = "ieee1394_host",
173
        .dev_release    = host_cls_release,
174
};
175
 
176
static void ne_cls_release(struct device *dev)
177
{
178
        put_device(&container_of((dev), struct node_entry, node_dev)->device);
179
}
180
 
181
static struct class nodemgr_ne_class = {
182
        .name           = "ieee1394_node",
183
        .dev_release    = ne_cls_release,
184
};
185
 
186
static void ud_cls_release(struct device *dev)
187
{
188
        put_device(&container_of((dev), struct unit_directory, unit_dev)->device);
189
}
190
 
191
/* The name here is only so that unit directory hotplug works with old
192
 * style hotplug, which only ever did unit directories anyway.
193
 */
194
static struct class nodemgr_ud_class = {
195
        .name           = "ieee1394",
196
        .dev_release    = ud_cls_release,
197
        .dev_uevent     = nodemgr_uevent,
198
};
199
 
200
static struct hpsb_highlevel nodemgr_highlevel;
201
 
202
 
203
static void nodemgr_release_ud(struct device *dev)
204
{
205
        struct unit_directory *ud = container_of(dev, struct unit_directory, device);
206
 
207
        if (ud->vendor_name_kv)
208
                csr1212_release_keyval(ud->vendor_name_kv);
209
        if (ud->model_name_kv)
210
                csr1212_release_keyval(ud->model_name_kv);
211
 
212
        kfree(ud);
213
}
214
 
215
static void nodemgr_release_ne(struct device *dev)
216
{
217
        struct node_entry *ne = container_of(dev, struct node_entry, device);
218
 
219
        if (ne->vendor_name_kv)
220
                csr1212_release_keyval(ne->vendor_name_kv);
221
 
222
        kfree(ne);
223
}
224
 
225
 
226
static void nodemgr_release_host(struct device *dev)
227
{
228
        struct hpsb_host *host = container_of(dev, struct hpsb_host, device);
229
 
230
        csr1212_destroy_csr(host->csr.rom);
231
 
232
        kfree(host);
233
}
234
 
235
static int nodemgr_ud_platform_data;
236
 
237
static struct device nodemgr_dev_template_ud = {
238
        .bus            = &ieee1394_bus_type,
239
        .release        = nodemgr_release_ud,
240
        .platform_data  = &nodemgr_ud_platform_data,
241
};
242
 
243
static struct device nodemgr_dev_template_ne = {
244
        .bus            = &ieee1394_bus_type,
245
        .release        = nodemgr_release_ne,
246
};
247
 
248
/* This dummy driver prevents the host devices from being scanned. We have no
249
 * useful drivers for them yet, and there would be a deadlock possible if the
250
 * driver core scans the host device while the host's low-level driver (i.e.
251
 * the host's parent device) is being removed. */
252
static struct device_driver nodemgr_mid_layer_driver = {
253
        .bus            = &ieee1394_bus_type,
254
        .name           = "nodemgr",
255
        .owner          = THIS_MODULE,
256
};
257
 
258
struct device nodemgr_dev_template_host = {
259
        .bus            = &ieee1394_bus_type,
260
        .release        = nodemgr_release_host,
261
};
262
 
263
 
264
#define fw_attr(class, class_type, field, type, format_string)          \
265
static ssize_t fw_show_##class##_##field (struct device *dev, struct device_attribute *attr, char *buf)\
266
{                                                                       \
267
        class_type *class;                                              \
268
        class = container_of(dev, class_type, device);                  \
269
        return sprintf(buf, format_string, (type)class->field);         \
270
}                                                                       \
271
static struct device_attribute dev_attr_##class##_##field = {           \
272
        .attr = {.name = __stringify(field), .mode = S_IRUGO },         \
273
        .show   = fw_show_##class##_##field,                            \
274
};
275
 
276
#define fw_attr_td(class, class_type, td_kv)                            \
277
static ssize_t fw_show_##class##_##td_kv (struct device *dev, struct device_attribute *attr, char *buf)\
278
{                                                                       \
279
        int len;                                                        \
280
        class_type *class = container_of(dev, class_type, device);      \
281
        len = (class->td_kv->value.leaf.len - 2) * sizeof(quadlet_t);   \
282
        memcpy(buf,                                                     \
283
               CSR1212_TEXTUAL_DESCRIPTOR_LEAF_DATA(class->td_kv),      \
284
               len);                                                    \
285
        while (buf[len - 1] == '\0')                                    \
286
                len--;                                                  \
287
        buf[len++] = '\n';                                              \
288
        buf[len] = '\0';                                                \
289
        return len;                                                     \
290
}                                                                       \
291
static struct device_attribute dev_attr_##class##_##td_kv = {           \
292
        .attr = {.name = __stringify(td_kv), .mode = S_IRUGO },         \
293
        .show   = fw_show_##class##_##td_kv,                            \
294
};
295
 
296
 
297
#define fw_drv_attr(field, type, format_string)                 \
298
static ssize_t fw_drv_show_##field (struct device_driver *drv, char *buf) \
299
{                                                               \
300
        struct hpsb_protocol_driver *driver;                    \
301
        driver = container_of(drv, struct hpsb_protocol_driver, driver); \
302
        return sprintf(buf, format_string, (type)driver->field);\
303
}                                                               \
304
static struct driver_attribute driver_attr_drv_##field = {      \
305
        .attr = {.name = __stringify(field), .mode = S_IRUGO }, \
306
        .show   = fw_drv_show_##field,                          \
307
};
308
 
309
 
310
static ssize_t fw_show_ne_bus_options(struct device *dev, struct device_attribute *attr, char *buf)
311
{
312
        struct node_entry *ne = container_of(dev, struct node_entry, device);
313
 
314
        return sprintf(buf, "IRMC(%d) CMC(%d) ISC(%d) BMC(%d) PMC(%d) GEN(%d) "
315
                       "LSPD(%d) MAX_REC(%d) MAX_ROM(%d) CYC_CLK_ACC(%d)\n",
316
                       ne->busopt.irmc,
317
                       ne->busopt.cmc, ne->busopt.isc, ne->busopt.bmc,
318
                       ne->busopt.pmc, ne->busopt.generation, ne->busopt.lnkspd,
319
                       ne->busopt.max_rec,
320
                       ne->busopt.max_rom,
321
                       ne->busopt.cyc_clk_acc);
322
}
323
static DEVICE_ATTR(bus_options,S_IRUGO,fw_show_ne_bus_options,NULL);
324
 
325
 
326
#ifdef HPSB_DEBUG_TLABELS
327
static ssize_t fw_show_ne_tlabels_free(struct device *dev,
328
                                       struct device_attribute *attr, char *buf)
329
{
330
        struct node_entry *ne = container_of(dev, struct node_entry, device);
331
        unsigned long flags;
332
        unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
333
        int tf;
334
 
335
        spin_lock_irqsave(&hpsb_tlabel_lock, flags);
336
        tf = 64 - bitmap_weight(tp, 64);
337
        spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
338
 
339
        return sprintf(buf, "%d\n", tf);
340
}
341
static DEVICE_ATTR(tlabels_free,S_IRUGO,fw_show_ne_tlabels_free,NULL);
342
 
343
 
344
static ssize_t fw_show_ne_tlabels_mask(struct device *dev,
345
                                       struct device_attribute *attr, char *buf)
346
{
347
        struct node_entry *ne = container_of(dev, struct node_entry, device);
348
        unsigned long flags;
349
        unsigned long *tp = ne->host->tl_pool[NODEID_TO_NODE(ne->nodeid)].map;
350
        u64 tm;
351
 
352
        spin_lock_irqsave(&hpsb_tlabel_lock, flags);
353
#if (BITS_PER_LONG <= 32)
354
        tm = ((u64)tp[0] << 32) + tp[1];
355
#else
356
        tm = tp[0];
357
#endif
358
        spin_unlock_irqrestore(&hpsb_tlabel_lock, flags);
359
 
360
        return sprintf(buf, "0x%016llx\n", (unsigned long long)tm);
361
}
362
static DEVICE_ATTR(tlabels_mask, S_IRUGO, fw_show_ne_tlabels_mask, NULL);
363
#endif /* HPSB_DEBUG_TLABELS */
364
 
365
 
366
static ssize_t fw_set_ignore_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
367
{
368
        struct unit_directory *ud = container_of(dev, struct unit_directory, device);
369
        int state = simple_strtoul(buf, NULL, 10);
370
 
371
        if (state == 1) {
372
                ud->ignore_driver = 1;
373
                device_release_driver(dev);
374
        } else if (state == 0)
375
                ud->ignore_driver = 0;
376
 
377
        return count;
378
}
379
static ssize_t fw_get_ignore_driver(struct device *dev, struct device_attribute *attr, char *buf)
380
{
381
        struct unit_directory *ud = container_of(dev, struct unit_directory, device);
382
 
383
        return sprintf(buf, "%d\n", ud->ignore_driver);
384
}
385
static DEVICE_ATTR(ignore_driver, S_IWUSR | S_IRUGO, fw_get_ignore_driver, fw_set_ignore_driver);
386
 
387
 
388
static ssize_t fw_set_destroy_node(struct bus_type *bus, const char *buf, size_t count)
389
{
390
        struct node_entry *ne;
391
        u64 guid = (u64)simple_strtoull(buf, NULL, 16);
392
 
393
        ne = find_entry_by_guid(guid);
394
 
395
        if (ne == NULL || !ne->in_limbo)
396
                return -EINVAL;
397
 
398
        nodemgr_remove_ne(ne);
399
 
400
        return count;
401
}
402
static ssize_t fw_get_destroy_node(struct bus_type *bus, char *buf)
403
{
404
        return sprintf(buf, "You can destroy in_limbo nodes by writing their GUID to this file\n");
405
}
406
static BUS_ATTR(destroy_node, S_IWUSR | S_IRUGO, fw_get_destroy_node, fw_set_destroy_node);
407
 
408
 
409
static ssize_t fw_set_rescan(struct bus_type *bus, const char *buf,
410
                             size_t count)
411
{
412
        int error = 0;
413
 
414
        if (simple_strtoul(buf, NULL, 10) == 1)
415
                error = bus_rescan_devices(&ieee1394_bus_type);
416
        return error ? error : count;
417
}
418
static ssize_t fw_get_rescan(struct bus_type *bus, char *buf)
419
{
420
        return sprintf(buf, "You can force a rescan of the bus for "
421
                        "drivers by writing a 1 to this file\n");
422
}
423
static BUS_ATTR(rescan, S_IWUSR | S_IRUGO, fw_get_rescan, fw_set_rescan);
424
 
425
 
426
static ssize_t fw_set_ignore_drivers(struct bus_type *bus, const char *buf, size_t count)
427
{
428
        int state = simple_strtoul(buf, NULL, 10);
429
 
430
        if (state == 1)
431
                ignore_drivers = 1;
432
        else if (state == 0)
433
                ignore_drivers = 0;
434
 
435
        return count;
436
}
437
static ssize_t fw_get_ignore_drivers(struct bus_type *bus, char *buf)
438
{
439
        return sprintf(buf, "%d\n", ignore_drivers);
440
}
441
static BUS_ATTR(ignore_drivers, S_IWUSR | S_IRUGO, fw_get_ignore_drivers, fw_set_ignore_drivers);
442
 
443
 
444
struct bus_attribute *const fw_bus_attrs[] = {
445
        &bus_attr_destroy_node,
446
        &bus_attr_rescan,
447
        &bus_attr_ignore_drivers,
448
        NULL
449
};
450
 
451
 
452
fw_attr(ne, struct node_entry, capabilities, unsigned int, "0x%06x\n")
453
fw_attr(ne, struct node_entry, nodeid, unsigned int, "0x%04x\n")
454
 
455
fw_attr(ne, struct node_entry, vendor_id, unsigned int, "0x%06x\n")
456
fw_attr_td(ne, struct node_entry, vendor_name_kv)
457
 
458
fw_attr(ne, struct node_entry, guid, unsigned long long, "0x%016Lx\n")
459
fw_attr(ne, struct node_entry, guid_vendor_id, unsigned int, "0x%06x\n")
460
fw_attr(ne, struct node_entry, in_limbo, int, "%d\n");
461
 
462
static struct device_attribute *const fw_ne_attrs[] = {
463
        &dev_attr_ne_guid,
464
        &dev_attr_ne_guid_vendor_id,
465
        &dev_attr_ne_capabilities,
466
        &dev_attr_ne_vendor_id,
467
        &dev_attr_ne_nodeid,
468
        &dev_attr_bus_options,
469
#ifdef HPSB_DEBUG_TLABELS
470
        &dev_attr_tlabels_free,
471
        &dev_attr_tlabels_mask,
472
#endif
473
};
474
 
475
 
476
 
477
fw_attr(ud, struct unit_directory, address, unsigned long long, "0x%016Lx\n")
478
fw_attr(ud, struct unit_directory, length, int, "%d\n")
479
/* These are all dependent on the value being provided */
480
fw_attr(ud, struct unit_directory, vendor_id, unsigned int, "0x%06x\n")
481
fw_attr(ud, struct unit_directory, model_id, unsigned int, "0x%06x\n")
482
fw_attr(ud, struct unit_directory, specifier_id, unsigned int, "0x%06x\n")
483
fw_attr(ud, struct unit_directory, version, unsigned int, "0x%06x\n")
484
fw_attr_td(ud, struct unit_directory, vendor_name_kv)
485
fw_attr_td(ud, struct unit_directory, model_name_kv)
486
 
487
static struct device_attribute *const fw_ud_attrs[] = {
488
        &dev_attr_ud_address,
489
        &dev_attr_ud_length,
490
        &dev_attr_ignore_driver,
491
};
492
 
493
 
494
fw_attr(host, struct hpsb_host, node_count, int, "%d\n")
495
fw_attr(host, struct hpsb_host, selfid_count, int, "%d\n")
496
fw_attr(host, struct hpsb_host, nodes_active, int, "%d\n")
497
fw_attr(host, struct hpsb_host, in_bus_reset, int, "%d\n")
498
fw_attr(host, struct hpsb_host, is_root, int, "%d\n")
499
fw_attr(host, struct hpsb_host, is_cycmst, int, "%d\n")
500
fw_attr(host, struct hpsb_host, is_irm, int, "%d\n")
501
fw_attr(host, struct hpsb_host, is_busmgr, int, "%d\n")
502
 
503
static struct device_attribute *const fw_host_attrs[] = {
504
        &dev_attr_host_node_count,
505
        &dev_attr_host_selfid_count,
506
        &dev_attr_host_nodes_active,
507
        &dev_attr_host_in_bus_reset,
508
        &dev_attr_host_is_root,
509
        &dev_attr_host_is_cycmst,
510
        &dev_attr_host_is_irm,
511
        &dev_attr_host_is_busmgr,
512
};
513
 
514
 
515
static ssize_t fw_show_drv_device_ids(struct device_driver *drv, char *buf)
516
{
517
        struct hpsb_protocol_driver *driver;
518
        struct ieee1394_device_id *id;
519
        int length = 0;
520
        char *scratch = buf;
521
 
522
        driver = container_of(drv, struct hpsb_protocol_driver, driver);
523
 
524
        for (id = driver->id_table; id->match_flags != 0; id++) {
525
                int need_coma = 0;
526
 
527
                if (id->match_flags & IEEE1394_MATCH_VENDOR_ID) {
528
                        length += sprintf(scratch, "vendor_id=0x%06x", id->vendor_id);
529
                        scratch = buf + length;
530
                        need_coma++;
531
                }
532
 
533
                if (id->match_flags & IEEE1394_MATCH_MODEL_ID) {
534
                        length += sprintf(scratch, "%smodel_id=0x%06x",
535
                                          need_coma++ ? "," : "",
536
                                          id->model_id);
537
                        scratch = buf + length;
538
                }
539
 
540
                if (id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) {
541
                        length += sprintf(scratch, "%sspecifier_id=0x%06x",
542
                                          need_coma++ ? "," : "",
543
                                          id->specifier_id);
544
                        scratch = buf + length;
545
                }
546
 
547
                if (id->match_flags & IEEE1394_MATCH_VERSION) {
548
                        length += sprintf(scratch, "%sversion=0x%06x",
549
                                          need_coma++ ? "," : "",
550
                                          id->version);
551
                        scratch = buf + length;
552
                }
553
 
554
                if (need_coma) {
555
                        *scratch++ = '\n';
556
                        length++;
557
                }
558
        }
559
 
560
        return length;
561
}
562
static DRIVER_ATTR(device_ids,S_IRUGO,fw_show_drv_device_ids,NULL);
563
 
564
 
565
fw_drv_attr(name, const char *, "%s\n")
566
 
567
static struct driver_attribute *const fw_drv_attrs[] = {
568
        &driver_attr_drv_name,
569
        &driver_attr_device_ids,
570
};
571
 
572
 
573
static void nodemgr_create_drv_files(struct hpsb_protocol_driver *driver)
574
{
575
        struct device_driver *drv = &driver->driver;
576
        int i;
577
 
578
        for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
579
                if (driver_create_file(drv, fw_drv_attrs[i]))
580
                        goto fail;
581
        return;
582
fail:
583
        HPSB_ERR("Failed to add sysfs attribute");
584
}
585
 
586
 
587
static void nodemgr_remove_drv_files(struct hpsb_protocol_driver *driver)
588
{
589
        struct device_driver *drv = &driver->driver;
590
        int i;
591
 
592
        for (i = 0; i < ARRAY_SIZE(fw_drv_attrs); i++)
593
                driver_remove_file(drv, fw_drv_attrs[i]);
594
}
595
 
596
 
597
static void nodemgr_create_ne_dev_files(struct node_entry *ne)
598
{
599
        struct device *dev = &ne->device;
600
        int i;
601
 
602
        for (i = 0; i < ARRAY_SIZE(fw_ne_attrs); i++)
603
                if (device_create_file(dev, fw_ne_attrs[i]))
604
                        goto fail;
605
        return;
606
fail:
607
        HPSB_ERR("Failed to add sysfs attribute");
608
}
609
 
610
 
611
static void nodemgr_create_host_dev_files(struct hpsb_host *host)
612
{
613
        struct device *dev = &host->device;
614
        int i;
615
 
616
        for (i = 0; i < ARRAY_SIZE(fw_host_attrs); i++)
617
                if (device_create_file(dev, fw_host_attrs[i]))
618
                        goto fail;
619
        return;
620
fail:
621
        HPSB_ERR("Failed to add sysfs attribute");
622
}
623
 
624
 
625
static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
626
                                               nodeid_t nodeid);
627
 
628
static void nodemgr_update_host_dev_links(struct hpsb_host *host)
629
{
630
        struct device *dev = &host->device;
631
        struct node_entry *ne;
632
 
633
        sysfs_remove_link(&dev->kobj, "irm_id");
634
        sysfs_remove_link(&dev->kobj, "busmgr_id");
635
        sysfs_remove_link(&dev->kobj, "host_id");
636
 
637
        if ((ne = find_entry_by_nodeid(host, host->irm_id)) &&
638
            sysfs_create_link(&dev->kobj, &ne->device.kobj, "irm_id"))
639
                goto fail;
640
        if ((ne = find_entry_by_nodeid(host, host->busmgr_id)) &&
641
            sysfs_create_link(&dev->kobj, &ne->device.kobj, "busmgr_id"))
642
                goto fail;
643
        if ((ne = find_entry_by_nodeid(host, host->node_id)) &&
644
            sysfs_create_link(&dev->kobj, &ne->device.kobj, "host_id"))
645
                goto fail;
646
        return;
647
fail:
648
        HPSB_ERR("Failed to update sysfs attributes for host %d", host->id);
649
}
650
 
651
static void nodemgr_create_ud_dev_files(struct unit_directory *ud)
652
{
653
        struct device *dev = &ud->device;
654
        int i;
655
 
656
        for (i = 0; i < ARRAY_SIZE(fw_ud_attrs); i++)
657
                if (device_create_file(dev, fw_ud_attrs[i]))
658
                        goto fail;
659
        if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
660
                if (device_create_file(dev, &dev_attr_ud_specifier_id))
661
                        goto fail;
662
        if (ud->flags & UNIT_DIRECTORY_VERSION)
663
                if (device_create_file(dev, &dev_attr_ud_version))
664
                        goto fail;
665
        if (ud->flags & UNIT_DIRECTORY_VENDOR_ID) {
666
                if (device_create_file(dev, &dev_attr_ud_vendor_id))
667
                        goto fail;
668
                if (ud->vendor_name_kv &&
669
                    device_create_file(dev, &dev_attr_ud_vendor_name_kv))
670
                        goto fail;
671
        }
672
        if (ud->flags & UNIT_DIRECTORY_MODEL_ID) {
673
                if (device_create_file(dev, &dev_attr_ud_model_id))
674
                        goto fail;
675
                if (ud->model_name_kv &&
676
                    device_create_file(dev, &dev_attr_ud_model_name_kv))
677
                        goto fail;
678
        }
679
        return;
680
fail:
681
        HPSB_ERR("Failed to add sysfs attribute");
682
}
683
 
684
 
685
static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
686
{
687
        struct hpsb_protocol_driver *driver;
688
        struct unit_directory *ud;
689
        struct ieee1394_device_id *id;
690
 
691
        /* We only match unit directories */
692
        if (dev->platform_data != &nodemgr_ud_platform_data)
693
                return 0;
694
 
695
        ud = container_of(dev, struct unit_directory, device);
696
        if (ud->ne->in_limbo || ud->ignore_driver)
697
                return 0;
698
 
699
        /* We only match drivers of type hpsb_protocol_driver */
700
        if (drv == &nodemgr_mid_layer_driver)
701
                return 0;
702
 
703
        driver = container_of(drv, struct hpsb_protocol_driver, driver);
704
        for (id = driver->id_table; id->match_flags != 0; id++) {
705
                if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
706
                    id->vendor_id != ud->vendor_id)
707
                        continue;
708
 
709
                if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
710
                    id->model_id != ud->model_id)
711
                        continue;
712
 
713
                if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
714
                    id->specifier_id != ud->specifier_id)
715
                        continue;
716
 
717
                if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
718
                    id->version != ud->version)
719
                        continue;
720
 
721
                return 1;
722
        }
723
 
724
        return 0;
725
}
726
 
727
 
728
static DEFINE_MUTEX(nodemgr_serialize_remove_uds);
729
 
730
static void nodemgr_remove_uds(struct node_entry *ne)
731
{
732
        struct device *dev;
733
        struct unit_directory *tmp, *ud;
734
 
735
        /* Iteration over nodemgr_ud_class.devices has to be protected by
736
         * nodemgr_ud_class.sem, but device_unregister() will eventually
737
         * take nodemgr_ud_class.sem too. Therefore pick out one ud at a time,
738
         * release the semaphore, and then unregister the ud. Since this code
739
         * may be called from other contexts besides the knodemgrds, protect the
740
         * gap after release of the semaphore by nodemgr_serialize_remove_uds.
741
         */
742
        mutex_lock(&nodemgr_serialize_remove_uds);
743
        for (;;) {
744
                ud = NULL;
745
                down(&nodemgr_ud_class.sem);
746
                list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
747
                        tmp = container_of(dev, struct unit_directory,
748
                                           unit_dev);
749
                        if (tmp->ne == ne) {
750
                                ud = tmp;
751
                                break;
752
                        }
753
                }
754
                up(&nodemgr_ud_class.sem);
755
                if (ud == NULL)
756
                        break;
757
                device_unregister(&ud->unit_dev);
758
                device_unregister(&ud->device);
759
        }
760
        mutex_unlock(&nodemgr_serialize_remove_uds);
761
}
762
 
763
 
764
static void nodemgr_remove_ne(struct node_entry *ne)
765
{
766
        struct device *dev;
767
 
768
        dev = get_device(&ne->device);
769
        if (!dev)
770
                return;
771
 
772
        HPSB_DEBUG("Node removed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
773
                   NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
774
        nodemgr_remove_uds(ne);
775
 
776
        device_unregister(&ne->node_dev);
777
        device_unregister(dev);
778
 
779
        put_device(dev);
780
}
781
 
782
static int __nodemgr_remove_host_dev(struct device *dev, void *data)
783
{
784
        if (dev->bus == &ieee1394_bus_type)
785
                nodemgr_remove_ne(container_of(dev, struct node_entry,
786
                                  device));
787
        return 0;
788
}
789
 
790
static void nodemgr_remove_host_dev(struct device *dev)
791
{
792
        WARN_ON(device_for_each_child(dev, NULL, __nodemgr_remove_host_dev));
793
        sysfs_remove_link(&dev->kobj, "irm_id");
794
        sysfs_remove_link(&dev->kobj, "busmgr_id");
795
        sysfs_remove_link(&dev->kobj, "host_id");
796
}
797
 
798
 
799
static void nodemgr_update_bus_options(struct node_entry *ne)
800
{
801
#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
802
        static const u16 mr[] = { 4, 64, 1024, 0};
803
#endif
804
        quadlet_t busoptions = be32_to_cpu(ne->csr->bus_info_data[2]);
805
 
806
        ne->busopt.irmc         = (busoptions >> 31) & 1;
807
        ne->busopt.cmc          = (busoptions >> 30) & 1;
808
        ne->busopt.isc          = (busoptions >> 29) & 1;
809
        ne->busopt.bmc          = (busoptions >> 28) & 1;
810
        ne->busopt.pmc          = (busoptions >> 27) & 1;
811
        ne->busopt.cyc_clk_acc  = (busoptions >> 16) & 0xff;
812
        ne->busopt.max_rec      = 1 << (((busoptions >> 12) & 0xf) + 1);
813
        ne->busopt.max_rom      = (busoptions >> 8) & 0x3;
814
        ne->busopt.generation   = (busoptions >> 4) & 0xf;
815
        ne->busopt.lnkspd       = busoptions & 0x7;
816
 
817
        HPSB_VERBOSE("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
818
                     "cyc_clk_acc=%d max_rec=%d max_rom=%d gen=%d lspd=%d",
819
                     busoptions, ne->busopt.irmc, ne->busopt.cmc,
820
                     ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
821
                     ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
822
                     mr[ne->busopt.max_rom],
823
                     ne->busopt.generation, ne->busopt.lnkspd);
824
}
825
 
826
 
827
static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr *csr,
828
                                              struct host_info *hi, nodeid_t nodeid,
829
                                              unsigned int generation)
830
{
831
        struct hpsb_host *host = hi->host;
832
        struct node_entry *ne;
833
 
834
        ne = kzalloc(sizeof(*ne), GFP_KERNEL);
835
        if (!ne)
836
                goto fail_alloc;
837
 
838
        ne->host = host;
839
        ne->nodeid = nodeid;
840
        ne->generation = generation;
841
        ne->needs_probe = 1;
842
 
843
        ne->guid = guid;
844
        ne->guid_vendor_id = (guid >> 40) & 0xffffff;
845
        ne->csr = csr;
846
 
847
        memcpy(&ne->device, &nodemgr_dev_template_ne,
848
               sizeof(ne->device));
849
        ne->device.parent = &host->device;
850
        snprintf(ne->device.bus_id, BUS_ID_SIZE, "%016Lx",
851
                 (unsigned long long)(ne->guid));
852
 
853
        ne->node_dev.parent = &ne->device;
854
        ne->node_dev.class = &nodemgr_ne_class;
855
        snprintf(ne->node_dev.bus_id, BUS_ID_SIZE, "%016Lx",
856
                (unsigned long long)(ne->guid));
857
 
858
        if (device_register(&ne->device))
859
                goto fail_devreg;
860
        if (device_register(&ne->node_dev))
861
                goto fail_classdevreg;
862
        get_device(&ne->device);
863
 
864
        nodemgr_create_ne_dev_files(ne);
865
 
866
        nodemgr_update_bus_options(ne);
867
 
868
        HPSB_DEBUG("%s added: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
869
                   (host->node_id == nodeid) ? "Host" : "Node",
870
                   NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
871
 
872
        return ne;
873
 
874
fail_classdevreg:
875
        device_unregister(&ne->device);
876
fail_devreg:
877
        kfree(ne);
878
fail_alloc:
879
        HPSB_ERR("Failed to create node ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
880
                 NODE_BUS_ARGS(host, nodeid), (unsigned long long)guid);
881
 
882
        return NULL;
883
}
884
 
885
 
886
static struct node_entry *find_entry_by_guid(u64 guid)
887
{
888
        struct device *dev;
889
        struct node_entry *ne, *ret_ne = NULL;
890
 
891
        down(&nodemgr_ne_class.sem);
892
        list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
893
                ne = container_of(dev, struct node_entry, node_dev);
894
 
895
                if (ne->guid == guid) {
896
                        ret_ne = ne;
897
                        break;
898
                }
899
        }
900
        up(&nodemgr_ne_class.sem);
901
 
902
        return ret_ne;
903
}
904
 
905
 
906
static struct node_entry *find_entry_by_nodeid(struct hpsb_host *host,
907
                                               nodeid_t nodeid)
908
{
909
        struct device *dev;
910
        struct node_entry *ne, *ret_ne = NULL;
911
 
912
        down(&nodemgr_ne_class.sem);
913
        list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
914
                ne = container_of(dev, struct node_entry, node_dev);
915
 
916
                if (ne->host == host && ne->nodeid == nodeid) {
917
                        ret_ne = ne;
918
                        break;
919
                }
920
        }
921
        up(&nodemgr_ne_class.sem);
922
 
923
        return ret_ne;
924
}
925
 
926
 
927
static void nodemgr_register_device(struct node_entry *ne,
928
        struct unit_directory *ud, struct device *parent)
929
{
930
        memcpy(&ud->device, &nodemgr_dev_template_ud,
931
               sizeof(ud->device));
932
 
933
        ud->device.parent = parent;
934
 
935
        snprintf(ud->device.bus_id, BUS_ID_SIZE, "%s-%u",
936
                 ne->device.bus_id, ud->id);
937
 
938
        ud->unit_dev.parent = &ud->device;
939
        ud->unit_dev.class = &nodemgr_ud_class;
940
        snprintf(ud->unit_dev.bus_id, BUS_ID_SIZE, "%s-%u",
941
                 ne->device.bus_id, ud->id);
942
 
943
        if (device_register(&ud->device))
944
                goto fail_devreg;
945
        if (device_register(&ud->unit_dev))
946
                goto fail_classdevreg;
947
        get_device(&ud->device);
948
 
949
        nodemgr_create_ud_dev_files(ud);
950
 
951
        return;
952
 
953
fail_classdevreg:
954
        device_unregister(&ud->device);
955
fail_devreg:
956
        HPSB_ERR("Failed to create unit %s", ud->device.bus_id);
957
}
958
 
959
 
960
/* This implementation currently only scans the config rom and its
961
 * immediate unit directories looking for software_id and
962
 * software_version entries, in order to get driver autoloading working. */
963
static struct unit_directory *nodemgr_process_unit_directory
964
        (struct host_info *hi, struct node_entry *ne, struct csr1212_keyval *ud_kv,
965
         unsigned int *id, struct unit_directory *parent)
966
{
967
        struct unit_directory *ud;
968
        struct unit_directory *ud_child = NULL;
969
        struct csr1212_dentry *dentry;
970
        struct csr1212_keyval *kv;
971
        u8 last_key_id = 0;
972
 
973
        ud = kzalloc(sizeof(*ud), GFP_KERNEL);
974
        if (!ud)
975
                goto unit_directory_error;
976
 
977
        ud->ne = ne;
978
        ud->ignore_driver = ignore_drivers;
979
        ud->address = ud_kv->offset + CSR1212_REGISTER_SPACE_BASE;
980
        ud->directory_id = ud->address & 0xffffff;
981
        ud->ud_kv = ud_kv;
982
        ud->id = (*id)++;
983
 
984
        csr1212_for_each_dir_entry(ne->csr, kv, ud_kv, dentry) {
985
                switch (kv->key.id) {
986
                case CSR1212_KV_ID_VENDOR:
987
                        if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
988
                                ud->vendor_id = kv->value.immediate;
989
                                ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
990
                        }
991
                        break;
992
 
993
                case CSR1212_KV_ID_MODEL:
994
                        ud->model_id = kv->value.immediate;
995
                        ud->flags |= UNIT_DIRECTORY_MODEL_ID;
996
                        break;
997
 
998
                case CSR1212_KV_ID_SPECIFIER_ID:
999
                        ud->specifier_id = kv->value.immediate;
1000
                        ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
1001
                        break;
1002
 
1003
                case CSR1212_KV_ID_VERSION:
1004
                        ud->version = kv->value.immediate;
1005
                        ud->flags |= UNIT_DIRECTORY_VERSION;
1006
                        break;
1007
 
1008
                case CSR1212_KV_ID_DESCRIPTOR:
1009
                        if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1010
                            CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1011
                            CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1012
                            CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1013
                            CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1014
                            CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1015
                                switch (last_key_id) {
1016
                                case CSR1212_KV_ID_VENDOR:
1017
                                        csr1212_keep_keyval(kv);
1018
                                        ud->vendor_name_kv = kv;
1019
                                        break;
1020
 
1021
                                case CSR1212_KV_ID_MODEL:
1022
                                        csr1212_keep_keyval(kv);
1023
                                        ud->model_name_kv = kv;
1024
                                        break;
1025
 
1026
                                }
1027
                        } /* else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) ... */
1028
                        break;
1029
 
1030
                case CSR1212_KV_ID_DEPENDENT_INFO:
1031
                        /* Logical Unit Number */
1032
                        if (kv->key.type == CSR1212_KV_TYPE_IMMEDIATE) {
1033
                                if (ud->flags & UNIT_DIRECTORY_HAS_LUN) {
1034
                                        ud_child = kmemdup(ud, sizeof(*ud_child), GFP_KERNEL);
1035
                                        if (!ud_child)
1036
                                                goto unit_directory_error;
1037
                                        nodemgr_register_device(ne, ud_child, &ne->device);
1038
                                        ud_child = NULL;
1039
 
1040
                                        ud->id = (*id)++;
1041
                                }
1042
                                ud->lun = kv->value.immediate;
1043
                                ud->flags |= UNIT_DIRECTORY_HAS_LUN;
1044
 
1045
                        /* Logical Unit Directory */
1046
                        } else if (kv->key.type == CSR1212_KV_TYPE_DIRECTORY) {
1047
                                /* This should really be done in SBP2 as this is
1048
                                 * doing SBP2 specific parsing.
1049
                                 */
1050
 
1051
                                /* first register the parent unit */
1052
                                ud->flags |= UNIT_DIRECTORY_HAS_LUN_DIRECTORY;
1053
                                if (ud->device.bus != &ieee1394_bus_type)
1054
                                        nodemgr_register_device(ne, ud, &ne->device);
1055
 
1056
                                /* process the child unit */
1057
                                ud_child = nodemgr_process_unit_directory(hi, ne, kv, id, ud);
1058
 
1059
                                if (ud_child == NULL)
1060
                                        break;
1061
 
1062
                                /* inherit unspecified values, the driver core picks it up */
1063
                                if ((ud->flags & UNIT_DIRECTORY_MODEL_ID) &&
1064
                                    !(ud_child->flags & UNIT_DIRECTORY_MODEL_ID))
1065
                                {
1066
                                        ud_child->flags |=  UNIT_DIRECTORY_MODEL_ID;
1067
                                        ud_child->model_id = ud->model_id;
1068
                                }
1069
                                if ((ud->flags & UNIT_DIRECTORY_SPECIFIER_ID) &&
1070
                                    !(ud_child->flags & UNIT_DIRECTORY_SPECIFIER_ID))
1071
                                {
1072
                                        ud_child->flags |=  UNIT_DIRECTORY_SPECIFIER_ID;
1073
                                        ud_child->specifier_id = ud->specifier_id;
1074
                                }
1075
                                if ((ud->flags & UNIT_DIRECTORY_VERSION) &&
1076
                                    !(ud_child->flags & UNIT_DIRECTORY_VERSION))
1077
                                {
1078
                                        ud_child->flags |=  UNIT_DIRECTORY_VERSION;
1079
                                        ud_child->version = ud->version;
1080
                                }
1081
 
1082
                                /* register the child unit */
1083
                                ud_child->flags |= UNIT_DIRECTORY_LUN_DIRECTORY;
1084
                                nodemgr_register_device(ne, ud_child, &ud->device);
1085
                        }
1086
 
1087
                        break;
1088
 
1089
                case CSR1212_KV_ID_DIRECTORY_ID:
1090
                        ud->directory_id = kv->value.immediate;
1091
                        break;
1092
 
1093
                default:
1094
                        break;
1095
                }
1096
                last_key_id = kv->key.id;
1097
        }
1098
 
1099
        /* do not process child units here and only if not already registered */
1100
        if (!parent && ud->device.bus != &ieee1394_bus_type)
1101
                nodemgr_register_device(ne, ud, &ne->device);
1102
 
1103
        return ud;
1104
 
1105
unit_directory_error:
1106
        kfree(ud);
1107
        return NULL;
1108
}
1109
 
1110
 
1111
static void nodemgr_process_root_directory(struct host_info *hi, struct node_entry *ne)
1112
{
1113
        unsigned int ud_id = 0;
1114
        struct csr1212_dentry *dentry;
1115
        struct csr1212_keyval *kv, *vendor_name_kv = NULL;
1116
        u8 last_key_id = 0;
1117
 
1118
        ne->needs_probe = 0;
1119
 
1120
        csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
1121
                switch (kv->key.id) {
1122
                case CSR1212_KV_ID_VENDOR:
1123
                        ne->vendor_id = kv->value.immediate;
1124
                        break;
1125
 
1126
                case CSR1212_KV_ID_NODE_CAPABILITIES:
1127
                        ne->capabilities = kv->value.immediate;
1128
                        break;
1129
 
1130
                case CSR1212_KV_ID_UNIT:
1131
                        nodemgr_process_unit_directory(hi, ne, kv, &ud_id, NULL);
1132
                        break;
1133
 
1134
                case CSR1212_KV_ID_DESCRIPTOR:
1135
                        if (last_key_id == CSR1212_KV_ID_VENDOR) {
1136
                                if (kv->key.type == CSR1212_KV_TYPE_LEAF &&
1137
                                    CSR1212_DESCRIPTOR_LEAF_TYPE(kv) == 0 &&
1138
                                    CSR1212_DESCRIPTOR_LEAF_SPECIFIER_ID(kv) == 0 &&
1139
                                    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_WIDTH(kv) == 0 &&
1140
                                    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_CHAR_SET(kv) == 0 &&
1141
                                    CSR1212_TEXTUAL_DESCRIPTOR_LEAF_LANGUAGE(kv) == 0) {
1142
                                        csr1212_keep_keyval(kv);
1143
                                        vendor_name_kv = kv;
1144
                                }
1145
                        }
1146
                        break;
1147
                }
1148
                last_key_id = kv->key.id;
1149
        }
1150
 
1151
        if (ne->vendor_name_kv) {
1152
                kv = ne->vendor_name_kv;
1153
                ne->vendor_name_kv = vendor_name_kv;
1154
                csr1212_release_keyval(kv);
1155
        } else if (vendor_name_kv) {
1156
                ne->vendor_name_kv = vendor_name_kv;
1157
                if (device_create_file(&ne->device,
1158
                                       &dev_attr_ne_vendor_name_kv) != 0)
1159
                        HPSB_ERR("Failed to add sysfs attribute");
1160
        }
1161
}
1162
 
1163
#ifdef CONFIG_HOTPLUG
1164
 
1165
static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1166
{
1167
        struct unit_directory *ud;
1168
        int retval = 0;
1169
        /* ieee1394:venNmoNspNverN */
1170
        char buf[8 + 1 + 3 + 8 + 2 + 8 + 2 + 8 + 3 + 8 + 1];
1171
 
1172
        if (!dev)
1173
                return -ENODEV;
1174
 
1175
        ud = container_of(dev, struct unit_directory, unit_dev);
1176
 
1177
        if (ud->ne->in_limbo || ud->ignore_driver)
1178
                return -ENODEV;
1179
 
1180
#define PUT_ENVP(fmt,val)                                       \
1181
do {                                                            \
1182
        retval = add_uevent_var(env, fmt, val);         \
1183
        if (retval)                                             \
1184
                return retval;                                  \
1185
} while (0)
1186
 
1187
        PUT_ENVP("VENDOR_ID=%06x", ud->vendor_id);
1188
        PUT_ENVP("MODEL_ID=%06x", ud->model_id);
1189
        PUT_ENVP("GUID=%016Lx", (unsigned long long)ud->ne->guid);
1190
        PUT_ENVP("SPECIFIER_ID=%06x", ud->specifier_id);
1191
        PUT_ENVP("VERSION=%06x", ud->version);
1192
        snprintf(buf, sizeof(buf), "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
1193
                        ud->vendor_id,
1194
                        ud->model_id,
1195
                        ud->specifier_id,
1196
                        ud->version);
1197
        PUT_ENVP("MODALIAS=%s", buf);
1198
 
1199
#undef PUT_ENVP
1200
 
1201
        return 0;
1202
}
1203
 
1204
#else
1205
 
1206
static int nodemgr_uevent(struct device *dev, struct kobj_uevent_env *env)
1207
{
1208
        return -ENODEV;
1209
}
1210
 
1211
#endif /* CONFIG_HOTPLUG */
1212
 
1213
 
1214
int __hpsb_register_protocol(struct hpsb_protocol_driver *drv,
1215
                             struct module *owner)
1216
{
1217
        int error;
1218
 
1219
        drv->driver.bus = &ieee1394_bus_type;
1220
        drv->driver.owner = owner;
1221
        drv->driver.name = drv->name;
1222
 
1223
        /* This will cause a probe for devices */
1224
        error = driver_register(&drv->driver);
1225
        if (!error)
1226
                nodemgr_create_drv_files(drv);
1227
        return error;
1228
}
1229
 
1230
void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
1231
{
1232
        nodemgr_remove_drv_files(driver);
1233
        /* This will subsequently disconnect all devices that our driver
1234
         * is attached to. */
1235
        driver_unregister(&driver->driver);
1236
}
1237
 
1238
 
1239
/*
1240
 * This function updates nodes that were present on the bus before the
1241
 * reset and still are after the reset.  The nodeid and the config rom
1242
 * may have changed, and the drivers managing this device must be
1243
 * informed that this device just went through a bus reset, to allow
1244
 * the to take whatever actions required.
1245
 */
1246
static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
1247
                                struct host_info *hi, nodeid_t nodeid,
1248
                                unsigned int generation)
1249
{
1250
        if (ne->nodeid != nodeid) {
1251
                HPSB_DEBUG("Node changed: " NODE_BUS_FMT " -> " NODE_BUS_FMT,
1252
                           NODE_BUS_ARGS(ne->host, ne->nodeid),
1253
                           NODE_BUS_ARGS(ne->host, nodeid));
1254
                ne->nodeid = nodeid;
1255
        }
1256
 
1257
        if (ne->busopt.generation != ((be32_to_cpu(csr->bus_info_data[2]) >> 4) & 0xf)) {
1258
                kfree(ne->csr->private);
1259
                csr1212_destroy_csr(ne->csr);
1260
                ne->csr = csr;
1261
 
1262
                /* If the node's configrom generation has changed, we
1263
                 * unregister all the unit directories. */
1264
                nodemgr_remove_uds(ne);
1265
 
1266
                nodemgr_update_bus_options(ne);
1267
 
1268
                /* Mark the node as new, so it gets re-probed */
1269
                ne->needs_probe = 1;
1270
        } else {
1271
                /* old cache is valid, so update its generation */
1272
                struct nodemgr_csr_info *ci = ne->csr->private;
1273
                ci->generation = generation;
1274
                /* free the partially filled now unneeded new cache */
1275
                kfree(csr->private);
1276
                csr1212_destroy_csr(csr);
1277
        }
1278
 
1279
        if (ne->in_limbo)
1280
                nodemgr_resume_ne(ne);
1281
 
1282
        /* Mark the node current */
1283
        ne->generation = generation;
1284
}
1285
 
1286
 
1287
 
1288
static void nodemgr_node_scan_one(struct host_info *hi,
1289
                                  nodeid_t nodeid, int generation)
1290
{
1291
        struct hpsb_host *host = hi->host;
1292
        struct node_entry *ne;
1293
        octlet_t guid;
1294
        struct csr1212_csr *csr;
1295
        struct nodemgr_csr_info *ci;
1296
        u8 *speed;
1297
 
1298
        ci = kmalloc(sizeof(*ci), GFP_KERNEL);
1299
        if (!ci)
1300
                return;
1301
 
1302
        ci->host = host;
1303
        ci->nodeid = nodeid;
1304
        ci->generation = generation;
1305
 
1306
        /* Prepare for speed probe which occurs when reading the ROM */
1307
        speed = &(host->speed[NODEID_TO_NODE(nodeid)]);
1308
        if (*speed > host->csr.lnk_spd)
1309
                *speed = host->csr.lnk_spd;
1310
        ci->speed_unverified = *speed > IEEE1394_SPEED_100;
1311
 
1312
        /* We need to detect when the ConfigROM's generation has changed,
1313
         * so we only update the node's info when it needs to be.  */
1314
 
1315
        csr = csr1212_create_csr(&nodemgr_csr_ops, 5 * sizeof(quadlet_t), ci);
1316
        if (!csr || csr1212_parse_csr(csr) != CSR1212_SUCCESS) {
1317
                HPSB_ERR("Error parsing configrom for node " NODE_BUS_FMT,
1318
                         NODE_BUS_ARGS(host, nodeid));
1319
                if (csr)
1320
                        csr1212_destroy_csr(csr);
1321
                kfree(ci);
1322
                return;
1323
        }
1324
 
1325
        if (csr->bus_info_data[1] != IEEE1394_BUSID_MAGIC) {
1326
                /* This isn't a 1394 device, but we let it slide. There
1327
                 * was a report of a device with broken firmware which
1328
                 * reported '2394' instead of '1394', which is obviously a
1329
                 * mistake. One would hope that a non-1394 device never
1330
                 * gets connected to Firewire bus. If someone does, we
1331
                 * shouldn't be held responsible, so we'll allow it with a
1332
                 * warning.  */
1333
                HPSB_WARN("Node " NODE_BUS_FMT " has invalid busID magic [0x%08x]",
1334
                          NODE_BUS_ARGS(host, nodeid), csr->bus_info_data[1]);
1335
        }
1336
 
1337
        guid = ((u64)be32_to_cpu(csr->bus_info_data[3]) << 32) | be32_to_cpu(csr->bus_info_data[4]);
1338
        ne = find_entry_by_guid(guid);
1339
 
1340
        if (ne && ne->host != host && ne->in_limbo) {
1341
                /* Must have moved this device from one host to another */
1342
                nodemgr_remove_ne(ne);
1343
                ne = NULL;
1344
        }
1345
 
1346
        if (!ne)
1347
                nodemgr_create_node(guid, csr, hi, nodeid, generation);
1348
        else
1349
                nodemgr_update_node(ne, csr, hi, nodeid, generation);
1350
}
1351
 
1352
 
1353
static void nodemgr_node_scan(struct host_info *hi, int generation)
1354
{
1355
        int count;
1356
        struct hpsb_host *host = hi->host;
1357
        struct selfid *sid = (struct selfid *)host->topology_map;
1358
        nodeid_t nodeid = LOCAL_BUS;
1359
 
1360
        /* Scan each node on the bus */
1361
        for (count = host->selfid_count; count; count--, sid++) {
1362
                if (sid->extended)
1363
                        continue;
1364
 
1365
                if (!sid->link_active) {
1366
                        nodeid++;
1367
                        continue;
1368
                }
1369
                nodemgr_node_scan_one(hi, nodeid++, generation);
1370
        }
1371
}
1372
 
1373
 
1374
static void nodemgr_suspend_ne(struct node_entry *ne)
1375
{
1376
        struct device *dev;
1377
        struct unit_directory *ud;
1378
        struct device_driver *drv;
1379
        int error;
1380
 
1381
        HPSB_DEBUG("Node suspended: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1382
                   NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1383
 
1384
        ne->in_limbo = 1;
1385
        WARN_ON(device_create_file(&ne->device, &dev_attr_ne_in_limbo));
1386
 
1387
        down(&nodemgr_ud_class.sem);
1388
        list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1389
                ud = container_of(dev, struct unit_directory, unit_dev);
1390
                if (ud->ne != ne)
1391
                        continue;
1392
 
1393
                drv = get_driver(ud->device.driver);
1394
                if (!drv)
1395
                        continue;
1396
 
1397
                error = 1; /* release if suspend is not implemented */
1398
                if (drv->suspend) {
1399
                        down(&ud->device.sem);
1400
                        error = drv->suspend(&ud->device, PMSG_SUSPEND);
1401
                        up(&ud->device.sem);
1402
                }
1403
                if (error)
1404
                        device_release_driver(&ud->device);
1405
                put_driver(drv);
1406
        }
1407
        up(&nodemgr_ud_class.sem);
1408
}
1409
 
1410
 
1411
static void nodemgr_resume_ne(struct node_entry *ne)
1412
{
1413
        struct device *dev;
1414
        struct unit_directory *ud;
1415
        struct device_driver *drv;
1416
 
1417
        ne->in_limbo = 0;
1418
        device_remove_file(&ne->device, &dev_attr_ne_in_limbo);
1419
 
1420
        down(&nodemgr_ud_class.sem);
1421
        list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1422
                ud = container_of(dev, struct unit_directory, unit_dev);
1423
                if (ud->ne != ne)
1424
                        continue;
1425
 
1426
                drv = get_driver(ud->device.driver);
1427
                if (!drv)
1428
                        continue;
1429
 
1430
                if (drv->resume) {
1431
                        down(&ud->device.sem);
1432
                        drv->resume(&ud->device);
1433
                        up(&ud->device.sem);
1434
                }
1435
                put_driver(drv);
1436
        }
1437
        up(&nodemgr_ud_class.sem);
1438
 
1439
        HPSB_DEBUG("Node resumed: ID:BUS[" NODE_BUS_FMT "]  GUID[%016Lx]",
1440
                   NODE_BUS_ARGS(ne->host, ne->nodeid), (unsigned long long)ne->guid);
1441
}
1442
 
1443
 
1444
static void nodemgr_update_pdrv(struct node_entry *ne)
1445
{
1446
        struct device *dev;
1447
        struct unit_directory *ud;
1448
        struct device_driver *drv;
1449
        struct hpsb_protocol_driver *pdrv;
1450
        int error;
1451
 
1452
        down(&nodemgr_ud_class.sem);
1453
        list_for_each_entry(dev, &nodemgr_ud_class.devices, node) {
1454
                ud = container_of(dev, struct unit_directory, unit_dev);
1455
                if (ud->ne != ne)
1456
                        continue;
1457
 
1458
                drv = get_driver(ud->device.driver);
1459
                if (!drv)
1460
                        continue;
1461
 
1462
                error = 0;
1463
                pdrv = container_of(drv, struct hpsb_protocol_driver, driver);
1464
                if (pdrv->update) {
1465
                        down(&ud->device.sem);
1466
                        error = pdrv->update(ud);
1467
                        up(&ud->device.sem);
1468
                }
1469
                if (error)
1470
                        device_release_driver(&ud->device);
1471
                put_driver(drv);
1472
        }
1473
        up(&nodemgr_ud_class.sem);
1474
}
1475
 
1476
 
1477
/* Write the BROADCAST_CHANNEL as per IEEE1394a 8.3.2.3.11 and 8.4.2.3.  This
1478
 * seems like an optional service but in the end it is practically mandatory
1479
 * as a consequence of these clauses.
1480
 *
1481
 * Note that we cannot do a broadcast write to all nodes at once because some
1482
 * pre-1394a devices would hang. */
1483
static void nodemgr_irm_write_bc(struct node_entry *ne, int generation)
1484
{
1485
        const u64 bc_addr = (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL);
1486
        quadlet_t bc_remote, bc_local;
1487
        int error;
1488
 
1489
        if (!ne->host->is_irm || ne->generation != generation ||
1490
            ne->nodeid == ne->host->node_id)
1491
                return;
1492
 
1493
        bc_local = cpu_to_be32(ne->host->csr.broadcast_channel);
1494
 
1495
        /* Check if the register is implemented and 1394a compliant. */
1496
        error = hpsb_read(ne->host, ne->nodeid, generation, bc_addr, &bc_remote,
1497
                          sizeof(bc_remote));
1498
        if (!error && bc_remote & cpu_to_be32(0x80000000) &&
1499
            bc_remote != bc_local)
1500
                hpsb_node_write(ne, bc_addr, &bc_local, sizeof(bc_local));
1501
}
1502
 
1503
 
1504
static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int generation)
1505
{
1506
        struct device *dev;
1507
 
1508
        if (ne->host != hi->host || ne->in_limbo)
1509
                return;
1510
 
1511
        dev = get_device(&ne->device);
1512
        if (!dev)
1513
                return;
1514
 
1515
        nodemgr_irm_write_bc(ne, generation);
1516
 
1517
        /* If "needs_probe", then this is either a new or changed node we
1518
         * rescan totally. If the generation matches for an existing node
1519
         * (one that existed prior to the bus reset) we send update calls
1520
         * down to the drivers. Otherwise, this is a dead node and we
1521
         * suspend it. */
1522
        if (ne->needs_probe)
1523
                nodemgr_process_root_directory(hi, ne);
1524
        else if (ne->generation == generation)
1525
                nodemgr_update_pdrv(ne);
1526
        else
1527
                nodemgr_suspend_ne(ne);
1528
 
1529
        put_device(dev);
1530
}
1531
 
1532
 
1533
static void nodemgr_node_probe(struct host_info *hi, int generation)
1534
{
1535
        struct hpsb_host *host = hi->host;
1536
        struct device *dev;
1537
        struct node_entry *ne;
1538
 
1539
        /* Do some processing of the nodes we've probed. This pulls them
1540
         * into the sysfs layer if needed, and can result in processing of
1541
         * unit-directories, or just updating the node and it's
1542
         * unit-directories.
1543
         *
1544
         * Run updates before probes. Usually, updates are time-critical
1545
         * while probes are time-consuming. (Well, those probes need some
1546
         * improvement...) */
1547
 
1548
        down(&nodemgr_ne_class.sem);
1549
        list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1550
                ne = container_of(dev, struct node_entry, node_dev);
1551
                if (!ne->needs_probe)
1552
                        nodemgr_probe_ne(hi, ne, generation);
1553
        }
1554
        list_for_each_entry(dev, &nodemgr_ne_class.devices, node) {
1555
                ne = container_of(dev, struct node_entry, node_dev);
1556
                if (ne->needs_probe)
1557
                        nodemgr_probe_ne(hi, ne, generation);
1558
        }
1559
        up(&nodemgr_ne_class.sem);
1560
 
1561
 
1562
        /* If we had a bus reset while we were scanning the bus, it is
1563
         * possible that we did not probe all nodes.  In that case, we
1564
         * skip the clean up for now, since we could remove nodes that
1565
         * were still on the bus.  Another bus scan is pending which will
1566
         * do the clean up eventually.
1567
         *
1568
         * Now let's tell the bus to rescan our devices. This may seem
1569
         * like overhead, but the driver-model core will only scan a
1570
         * device for a driver when either the device is added, or when a
1571
         * new driver is added. A bus reset is a good reason to rescan
1572
         * devices that were there before.  For example, an sbp2 device
1573
         * may become available for login, if the host that held it was
1574
         * just removed.  */
1575
 
1576
        if (generation == get_hpsb_generation(host))
1577
                if (bus_rescan_devices(&ieee1394_bus_type))
1578
                        HPSB_DEBUG("bus_rescan_devices had an error");
1579
}
1580
 
1581
static int nodemgr_send_resume_packet(struct hpsb_host *host)
1582
{
1583
        struct hpsb_packet *packet;
1584
        int error = -ENOMEM;
1585
 
1586
        packet = hpsb_make_phypacket(host,
1587
                        EXTPHYPACKET_TYPE_RESUME |
1588
                        NODEID_TO_NODE(host->node_id) << PHYPACKET_PORT_SHIFT);
1589
        if (packet) {
1590
                packet->no_waiter = 1;
1591
                packet->generation = get_hpsb_generation(host);
1592
                error = hpsb_send_packet(packet);
1593
        }
1594
        if (error)
1595
                HPSB_WARN("fw-host%d: Failed to broadcast resume packet",
1596
                          host->id);
1597
        return error;
1598
}
1599
 
1600
/* Perform a few high-level IRM responsibilities. */
1601
static int nodemgr_do_irm_duties(struct hpsb_host *host, int cycles)
1602
{
1603
        quadlet_t bc;
1604
 
1605
        /* if irm_id == -1 then there is no IRM on this bus */
1606
        if (!host->is_irm || host->irm_id == (nodeid_t)-1)
1607
                return 1;
1608
 
1609
        /* We are a 1394a-2000 compliant IRM. Set the validity bit. */
1610
        host->csr.broadcast_channel |= 0x40000000;
1611
 
1612
        /* If there is no bus manager then we should set the root node's
1613
         * force_root bit to promote bus stability per the 1394
1614
         * spec. (8.4.2.6) */
1615
        if (host->busmgr_id == 0xffff && host->node_count > 1)
1616
        {
1617
                u16 root_node = host->node_count - 1;
1618
 
1619
                /* get cycle master capability flag from root node */
1620
                if (host->is_cycmst ||
1621
                    (!hpsb_read(host, LOCAL_BUS | root_node, get_hpsb_generation(host),
1622
                                (CSR_REGISTER_BASE + CSR_CONFIG_ROM + 2 * sizeof(quadlet_t)),
1623
                                &bc, sizeof(quadlet_t)) &&
1624
                     be32_to_cpu(bc) & 1 << CSR_CMC_SHIFT))
1625
                        hpsb_send_phy_config(host, root_node, -1);
1626
                else {
1627
                        HPSB_DEBUG("The root node is not cycle master capable; "
1628
                                   "selecting a new root node and resetting...");
1629
 
1630
                        if (cycles >= 5) {
1631
                                /* Oh screw it! Just leave the bus as it is */
1632
                                HPSB_DEBUG("Stopping reset loop for IRM sanity");
1633
                                return 1;
1634
                        }
1635
 
1636
                        hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1637
                        hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1638
 
1639
                        return 0;
1640
                }
1641
        }
1642
 
1643
        /* Some devices suspend their ports while being connected to an inactive
1644
         * host adapter, i.e. if connected before the low-level driver is
1645
         * loaded.  They become visible either when physically unplugged and
1646
         * replugged, or when receiving a resume packet.  Send one once. */
1647
        if (!host->resume_packet_sent && !nodemgr_send_resume_packet(host))
1648
                host->resume_packet_sent = 1;
1649
 
1650
        return 1;
1651
}
1652
 
1653
/* We need to ensure that if we are not the IRM, that the IRM node is capable of
1654
 * everything we can do, otherwise issue a bus reset and try to become the IRM
1655
 * ourselves. */
1656
static int nodemgr_check_irm_capability(struct hpsb_host *host, int cycles)
1657
{
1658
        quadlet_t bc;
1659
        int status;
1660
 
1661
        if (hpsb_disable_irm || host->is_irm)
1662
                return 1;
1663
 
1664
        status = hpsb_read(host, LOCAL_BUS | (host->irm_id),
1665
                           get_hpsb_generation(host),
1666
                           (CSR_REGISTER_BASE | CSR_BROADCAST_CHANNEL),
1667
                           &bc, sizeof(quadlet_t));
1668
 
1669
        if (status < 0 || !(be32_to_cpu(bc) & 0x80000000)) {
1670
                /* The current irm node does not have a valid BROADCAST_CHANNEL
1671
                 * register and we do, so reset the bus with force_root set */
1672
                HPSB_DEBUG("Current remote IRM is not 1394a-2000 compliant, resetting...");
1673
 
1674
                if (cycles >= 5) {
1675
                        /* Oh screw it! Just leave the bus as it is */
1676
                        HPSB_DEBUG("Stopping reset loop for IRM sanity");
1677
                        return 1;
1678
                }
1679
 
1680
                hpsb_send_phy_config(host, NODEID_TO_NODE(host->node_id), -1);
1681
                hpsb_reset_bus(host, LONG_RESET_FORCE_ROOT);
1682
 
1683
                return 0;
1684
        }
1685
 
1686
        return 1;
1687
}
1688
 
1689
static int nodemgr_host_thread(void *__hi)
1690
{
1691
        struct host_info *hi = (struct host_info *)__hi;
1692
        struct hpsb_host *host = hi->host;
1693
        unsigned int g, generation = 0;
1694
        int i, reset_cycles = 0;
1695
 
1696
        set_freezable();
1697
        /* Setup our device-model entries */
1698
        nodemgr_create_host_dev_files(host);
1699
 
1700
        for (;;) {
1701
                /* Sleep until next bus reset */
1702
                set_current_state(TASK_INTERRUPTIBLE);
1703
                if (get_hpsb_generation(host) == generation &&
1704
                    !kthread_should_stop())
1705
                        schedule();
1706
                __set_current_state(TASK_RUNNING);
1707
 
1708
                /* Thread may have been woken up to freeze or to exit */
1709
                if (try_to_freeze())
1710
                        continue;
1711
                if (kthread_should_stop())
1712
                        goto exit;
1713
 
1714
                /* Pause for 1/4 second in 1/16 second intervals,
1715
                 * to make sure things settle down. */
1716
                g = get_hpsb_generation(host);
1717
                for (i = 0; i < 4 ; i++) {
1718
                        msleep_interruptible(63);
1719
                        if (kthread_should_stop())
1720
                                goto exit;
1721
 
1722
                        /* Now get the generation in which the node ID's we collect
1723
                         * are valid.  During the bus scan we will use this generation
1724
                         * for the read transactions, so that if another reset occurs
1725
                         * during the scan the transactions will fail instead of
1726
                         * returning bogus data. */
1727
                        generation = get_hpsb_generation(host);
1728
 
1729
                        /* If we get a reset before we are done waiting, then
1730
                         * start the waiting over again */
1731
                        if (generation != g)
1732
                                g = generation, i = 0;
1733
                }
1734
 
1735
                if (!nodemgr_check_irm_capability(host, reset_cycles) ||
1736
                    !nodemgr_do_irm_duties(host, reset_cycles)) {
1737
                        reset_cycles++;
1738
                        continue;
1739
                }
1740
                reset_cycles = 0;
1741
 
1742
                /* Scan our nodes to get the bus options and create node
1743
                 * entries. This does not do the sysfs stuff, since that
1744
                 * would trigger uevents and such, which is a bad idea at
1745
                 * this point. */
1746
                nodemgr_node_scan(hi, generation);
1747
 
1748
                /* This actually does the full probe, with sysfs
1749
                 * registration. */
1750
                nodemgr_node_probe(hi, generation);
1751
 
1752
                /* Update some of our sysfs symlinks */
1753
                nodemgr_update_host_dev_links(host);
1754
        }
1755
exit:
1756
        HPSB_VERBOSE("NodeMgr: Exiting thread");
1757
        return 0;
1758
}
1759
 
1760
/**
1761
 * nodemgr_for_each_host - call a function for each IEEE 1394 host
1762
 * @data: an address to supply to the callback
1763
 * @cb: function to call for each host
1764
 *
1765
 * Iterate the hosts, calling a given function with supplied data for each host.
1766
 * If the callback fails on a host, i.e. if it returns a non-zero value, the
1767
 * iteration is stopped.
1768
 *
1769
 * Return value: 0 on success, non-zero on failure (same as returned by last run
1770
 * of the callback).
1771
 */
1772
int nodemgr_for_each_host(void *data, int (*cb)(struct hpsb_host *, void *))
1773
{
1774
        struct device *dev;
1775
        struct hpsb_host *host;
1776
        int error = 0;
1777
 
1778
        down(&hpsb_host_class.sem);
1779
        list_for_each_entry(dev, &hpsb_host_class.devices, node) {
1780
                host = container_of(dev, struct hpsb_host, host_dev);
1781
 
1782
                if ((error = cb(host, data)))
1783
                        break;
1784
        }
1785
        up(&hpsb_host_class.sem);
1786
 
1787
        return error;
1788
}
1789
 
1790
/* The following two convenience functions use a struct node_entry
1791
 * for addressing a node on the bus.  They are intended for use by any
1792
 * process context, not just the nodemgr thread, so we need to be a
1793
 * little careful when reading out the node ID and generation.  The
1794
 * thing that can go wrong is that we get the node ID, then a bus
1795
 * reset occurs, and then we read the generation.  The node ID is
1796
 * possibly invalid, but the generation is current, and we end up
1797
 * sending a packet to a the wrong node.
1798
 *
1799
 * The solution is to make sure we read the generation first, so that
1800
 * if a reset occurs in the process, we end up with a stale generation
1801
 * and the transactions will fail instead of silently using wrong node
1802
 * ID's.
1803
 */
1804
 
1805
/**
1806
 * hpsb_node_fill_packet - fill some destination information into a packet
1807
 * @ne: destination node
1808
 * @packet: packet to fill in
1809
 *
1810
 * This will fill in the given, pre-initialised hpsb_packet with the current
1811
 * information from the node entry (host, node ID, bus generation number).
1812
 */
1813
void hpsb_node_fill_packet(struct node_entry *ne, struct hpsb_packet *packet)
1814
{
1815
        packet->host = ne->host;
1816
        packet->generation = ne->generation;
1817
        barrier();
1818
        packet->node_id = ne->nodeid;
1819
}
1820
 
1821
int hpsb_node_write(struct node_entry *ne, u64 addr,
1822
                    quadlet_t *buffer, size_t length)
1823
{
1824
        unsigned int generation = ne->generation;
1825
 
1826
        barrier();
1827
        return hpsb_write(ne->host, ne->nodeid, generation,
1828
                          addr, buffer, length);
1829
}
1830
 
1831
static void nodemgr_add_host(struct hpsb_host *host)
1832
{
1833
        struct host_info *hi;
1834
 
1835
        hi = hpsb_create_hostinfo(&nodemgr_highlevel, host, sizeof(*hi));
1836
        if (!hi) {
1837
                HPSB_ERR("NodeMgr: out of memory in add host");
1838
                return;
1839
        }
1840
        hi->host = host;
1841
        hi->thread = kthread_run(nodemgr_host_thread, hi, "knodemgrd_%d",
1842
                                 host->id);
1843
        if (IS_ERR(hi->thread)) {
1844
                HPSB_ERR("NodeMgr: cannot start thread for host %d", host->id);
1845
                hpsb_destroy_hostinfo(&nodemgr_highlevel, host);
1846
        }
1847
}
1848
 
1849
static void nodemgr_host_reset(struct hpsb_host *host)
1850
{
1851
        struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1852
 
1853
        if (hi) {
1854
                HPSB_VERBOSE("NodeMgr: Processing reset for host %d", host->id);
1855
                wake_up_process(hi->thread);
1856
        }
1857
}
1858
 
1859
static void nodemgr_remove_host(struct hpsb_host *host)
1860
{
1861
        struct host_info *hi = hpsb_get_hostinfo(&nodemgr_highlevel, host);
1862
 
1863
        if (hi) {
1864
                kthread_stop(hi->thread);
1865
                nodemgr_remove_host_dev(&host->device);
1866
        }
1867
}
1868
 
1869
static struct hpsb_highlevel nodemgr_highlevel = {
1870
        .name =         "Node manager",
1871
        .add_host =     nodemgr_add_host,
1872
        .host_reset =   nodemgr_host_reset,
1873
        .remove_host =  nodemgr_remove_host,
1874
};
1875
 
1876
int init_ieee1394_nodemgr(void)
1877
{
1878
        int error;
1879
 
1880
        error = class_register(&nodemgr_ne_class);
1881
        if (error)
1882
                goto fail_ne;
1883
        error = class_register(&nodemgr_ud_class);
1884
        if (error)
1885
                goto fail_ud;
1886
        error = driver_register(&nodemgr_mid_layer_driver);
1887
        if (error)
1888
                goto fail_ml;
1889
        /* This driver is not used if nodemgr is off (disable_nodemgr=1). */
1890
        nodemgr_dev_template_host.driver = &nodemgr_mid_layer_driver;
1891
 
1892
        hpsb_register_highlevel(&nodemgr_highlevel);
1893
        return 0;
1894
 
1895
fail_ml:
1896
        class_unregister(&nodemgr_ud_class);
1897
fail_ud:
1898
        class_unregister(&nodemgr_ne_class);
1899
fail_ne:
1900
        return error;
1901
}
1902
 
1903
void cleanup_ieee1394_nodemgr(void)
1904
{
1905
        hpsb_unregister_highlevel(&nodemgr_highlevel);
1906
        driver_unregister(&nodemgr_mid_layer_driver);
1907
        class_unregister(&nodemgr_ud_class);
1908
        class_unregister(&nodemgr_ne_class);
1909
}

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