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1// SPDX-License-Identifier: GPL-2.0
2/* vio.c: Virtual I/O channel devices probing infrastructure.
3 *
4 * Copyright (c) 2003-2005 IBM Corp.
5 * Dave Engebretsen engebret@us.ibm.com
6 * Santiago Leon santil@us.ibm.com
7 * Hollis Blanchard <hollisb@us.ibm.com>
8 * Stephen Rothwell
9 *
10 * Adapted to sparc64 by David S. Miller davem@davemloft.net
11 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/irq.h>
16#include <linux/export.h>
17#include <linux/init.h>
18
19#include <asm/mdesc.h>
20#include <asm/vio.h>
21
22static const struct vio_device_id *vio_match_device(
23 const struct vio_device_id *matches,
24 const struct vio_dev *dev)
25{
26 const char *type, *compat;
27 int len;
28
29 type = dev->type;
30 compat = dev->compat;
31 len = dev->compat_len;
32
33 while (matches->type[0] || matches->compat[0]) {
34 int match = 1;
35 if (matches->type[0])
36 match &= !strcmp(matches->type, type);
37
38 if (matches->compat[0]) {
39 match &= len &&
40 of_find_in_proplist(compat, matches->compat, len);
41 }
42 if (match)
43 return matches;
44 matches++;
45 }
46 return NULL;
47}
48
49static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
50{
51 const struct vio_dev *vio_dev = to_vio_dev(dev);
52
53 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
54 return 0;
55}
56
57static int vio_bus_match(struct device *dev, struct device_driver *drv)
58{
59 struct vio_dev *vio_dev = to_vio_dev(dev);
60 struct vio_driver *vio_drv = to_vio_driver(drv);
61 const struct vio_device_id *matches = vio_drv->id_table;
62
63 if (!matches)
64 return 0;
65
66 return vio_match_device(matches, vio_dev) != NULL;
67}
68
69static int vio_device_probe(struct device *dev)
70{
71 struct vio_dev *vdev = to_vio_dev(dev);
72 struct vio_driver *drv = to_vio_driver(dev->driver);
73 const struct vio_device_id *id;
74
75 if (!drv->probe)
76 return -ENODEV;
77
78 id = vio_match_device(drv->id_table, vdev);
79 if (!id)
80 return -ENODEV;
81
82 /* alloc irqs (unless the driver specified not to) */
83 if (!drv->no_irq) {
84 if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
85 vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
86 vdev->tx_ino);
87
88 if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
89 vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
90 vdev->rx_ino);
91 }
92
93 return drv->probe(vdev, id);
94}
95
96static int vio_device_remove(struct device *dev)
97{
98 struct vio_dev *vdev = to_vio_dev(dev);
99 struct vio_driver *drv = to_vio_driver(dev->driver);
100
101 if (drv->remove) {
102 /*
103 * Ideally, we would remove/deallocate tx/rx virqs
104 * here - however, there are currently no support
105 * routines to do so at the moment. TBD
106 */
107
108 return drv->remove(vdev);
109 }
110
111 return 1;
112}
113
114static ssize_t devspec_show(struct device *dev,
115 struct device_attribute *attr, char *buf)
116{
117 struct vio_dev *vdev = to_vio_dev(dev);
118 const char *str = "none";
119
120 if (!strcmp(vdev->type, "vnet-port"))
121 str = "vnet";
122 else if (!strcmp(vdev->type, "vdc-port"))
123 str = "vdisk";
124
125 return sprintf(buf, "%s\n", str);
126}
127static DEVICE_ATTR_RO(devspec);
128
129static ssize_t type_show(struct device *dev,
130 struct device_attribute *attr, char *buf)
131{
132 struct vio_dev *vdev = to_vio_dev(dev);
133 return sprintf(buf, "%s\n", vdev->type);
134}
135static DEVICE_ATTR_RO(type);
136
137static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
138 char *buf)
139{
140 const struct vio_dev *vdev = to_vio_dev(dev);
141
142 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
143}
144static DEVICE_ATTR_RO(modalias);
145
146static struct attribute *vio_dev_attrs[] = {
147 &dev_attr_devspec.attr,
148 &dev_attr_type.attr,
149 &dev_attr_modalias.attr,
150 NULL,
151 };
152ATTRIBUTE_GROUPS(vio_dev);
153
154static struct bus_type vio_bus_type = {
155 .name = "vio",
156 .dev_groups = vio_dev_groups,
157 .uevent = vio_hotplug,
158 .match = vio_bus_match,
159 .probe = vio_device_probe,
160 .remove = vio_device_remove,
161};
162
163int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
164 const char *mod_name)
165{
166 viodrv->driver.bus = &vio_bus_type;
167 viodrv->driver.name = viodrv->name;
168 viodrv->driver.owner = owner;
169 viodrv->driver.mod_name = mod_name;
170
171 return driver_register(&viodrv->driver);
172}
173EXPORT_SYMBOL(__vio_register_driver);
174
175void vio_unregister_driver(struct vio_driver *viodrv)
176{
177 driver_unregister(&viodrv->driver);
178}
179EXPORT_SYMBOL(vio_unregister_driver);
180
181static void vio_dev_release(struct device *dev)
182{
183 kfree(to_vio_dev(dev));
184}
185
186static ssize_t
187show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
188 char *buf)
189{
190 struct vio_dev *vdev;
191 struct device_node *dp;
192
193 vdev = to_vio_dev(dev);
194 dp = vdev->dp;
195
196 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
197}
198
199static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
200 show_pciobppath_attr, NULL);
201
202static struct device_node *cdev_node;
203
204static struct vio_dev *root_vdev;
205static u64 cdev_cfg_handle;
206
207static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node)
208{
209 const u64 *cfg_handle = NULL;
210 u64 a;
211
212 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
213 u64 target;
214
215 target = mdesc_arc_target(hp, a);
216 cfg_handle = mdesc_get_property(hp, target,
217 "cfg-handle", NULL);
218 if (cfg_handle)
219 break;
220 }
221
222 return cfg_handle;
223}
224
225/**
226 * vio_vdev_node() - Find VDEV node in MD
227 * @hp: Handle to the MD
228 * @vdev: Pointer to VDEV
229 *
230 * Find the node in the current MD which matches the given vio_dev. This
231 * must be done dynamically since the node value can change if the MD
232 * is updated.
233 *
234 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine
235 *
236 * Return: The VDEV node in MDESC
237 */
238u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)
239{
240 u64 node;
241
242 if (vdev == NULL)
243 return MDESC_NODE_NULL;
244
245 node = mdesc_get_node(hp, (const char *)vdev->node_name,
246 &vdev->md_node_info);
247
248 return node;
249}
250EXPORT_SYMBOL(vio_vdev_node);
251
252static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
253 struct vio_dev *vdev)
254{
255 u64 a;
256
257 vdev->tx_ino = ~0UL;
258 vdev->rx_ino = ~0UL;
259 vdev->channel_id = ~0UL;
260 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
261 const u64 *chan_id;
262 const u64 *irq;
263 u64 target;
264
265 target = mdesc_arc_target(hp, a);
266
267 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
268 if (irq)
269 vdev->tx_ino = *irq;
270
271 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
272 if (irq)
273 vdev->rx_ino = *irq;
274
275 chan_id = mdesc_get_property(hp, target, "id", NULL);
276 if (chan_id)
277 vdev->channel_id = *chan_id;
278 }
279
280 vdev->cdev_handle = cdev_cfg_handle;
281}
282
283int vio_set_intr(unsigned long dev_ino, int state)
284{
285 int err;
286
287 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
288 return err;
289}
290EXPORT_SYMBOL(vio_set_intr);
291
292static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
293 const char *node_name,
294 struct device *parent)
295{
296 const char *type, *compat;
297 struct device_node *dp;
298 struct vio_dev *vdev;
299 int err, tlen, clen;
300 const u64 *id, *cfg_handle;
301
302 type = mdesc_get_property(hp, mp, "device-type", &tlen);
303 if (!type) {
304 type = mdesc_get_property(hp, mp, "name", &tlen);
305 if (!type) {
306 type = mdesc_node_name(hp, mp);
307 tlen = strlen(type) + 1;
308 }
309 }
310 if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) {
311 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
312 type);
313 return NULL;
314 }
315
316 id = mdesc_get_property(hp, mp, "id", NULL);
317
318 cfg_handle = vio_cfg_handle(hp, mp);
319
320 compat = mdesc_get_property(hp, mp, "device-type", &clen);
321 if (!compat) {
322 clen = 0;
323 } else if (clen > VIO_MAX_COMPAT_LEN) {
324 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
325 clen, type);
326 return NULL;
327 }
328
329 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
330 if (!vdev) {
331 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
332 return NULL;
333 }
334
335 vdev->mp = mp;
336 memcpy(vdev->type, type, tlen);
337 if (compat)
338 memcpy(vdev->compat, compat, clen);
339 else
340 memset(vdev->compat, 0, sizeof(vdev->compat));
341 vdev->compat_len = clen;
342
343 vdev->port_id = ~0UL;
344 vdev->tx_irq = 0;
345 vdev->rx_irq = 0;
346
347 vio_fill_channel_info(hp, mp, vdev);
348
349 if (!id) {
350 dev_set_name(&vdev->dev, "%s", type);
351 vdev->dev_no = ~(u64)0;
352 } else if (!cfg_handle) {
353 dev_set_name(&vdev->dev, "%s-%llu", type, *id);
354 vdev->dev_no = *id;
355 } else {
356 dev_set_name(&vdev->dev, "%s-%llu-%llu", type,
357 *cfg_handle, *id);
358 vdev->dev_no = *cfg_handle;
359 vdev->port_id = *id;
360 }
361
362 vdev->dev.parent = parent;
363 vdev->dev.bus = &vio_bus_type;
364 vdev->dev.release = vio_dev_release;
365
366 if (parent == NULL) {
367 dp = cdev_node;
368 } else if (to_vio_dev(parent) == root_vdev) {
369 dp = of_get_next_child(cdev_node, NULL);
370 while (dp) {
371 if (!strcmp(dp->type, type))
372 break;
373
374 dp = of_get_next_child(cdev_node, dp);
375 }
376 } else {
377 dp = to_vio_dev(parent)->dp;
378 }
379 vdev->dp = dp;
380
381 /*
382 * node_name is NULL for the parent/channel-devices node and
383 * the parent doesn't require the MD node info.
384 */
385 if (node_name != NULL) {
386 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
387 node_name);
388
389 err = mdesc_get_node_info(hp, mp, node_name,
390 &vdev->md_node_info);
391 if (err) {
392 pr_err("VIO: Could not get MD node info %s, err=%d\n",
393 dev_name(&vdev->dev), err);
394 kfree(vdev);
395 return NULL;
396 }
397 }
398
399 pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
400 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
401
402 err = device_register(&vdev->dev);
403 if (err) {
404 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
405 dev_name(&vdev->dev), err);
406 put_device(&vdev->dev);
407 return NULL;
408 }
409 if (vdev->dp)
410 err = sysfs_create_file(&vdev->dev.kobj,
411 &dev_attr_obppath.attr);
412
413 return vdev;
414}
415
416static void vio_add(struct mdesc_handle *hp, u64 node,
417 const char *node_name)
418{
419 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
420}
421
422struct vio_remove_node_data {
423 struct mdesc_handle *hp;
424 u64 node;
425};
426
427static int vio_md_node_match(struct device *dev, void *arg)
428{
429 struct vio_dev *vdev = to_vio_dev(dev);
430 struct vio_remove_node_data *node_data;
431 u64 node;
432
433 node_data = (struct vio_remove_node_data *)arg;
434
435 node = vio_vdev_node(node_data->hp, vdev);
436
437 if (node == node_data->node)
438 return 1;
439 else
440 return 0;
441}
442
443static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
444{
445 struct vio_remove_node_data node_data;
446 struct device *dev;
447
448 node_data.hp = hp;
449 node_data.node = node;
450
451 dev = device_find_child(&root_vdev->dev, (void *)&node_data,
452 vio_md_node_match);
453 if (dev) {
454 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
455
456 device_unregister(dev);
457 put_device(dev);
458 } else {
459 pr_err("VIO: %s node not found in MDESC\n", node_name);
460 }
461}
462
463static struct mdesc_notifier_client vio_device_notifier = {
464 .add = vio_add,
465 .remove = vio_remove,
466 .node_name = "virtual-device-port",
467};
468
469/* We are only interested in domain service ports under the
470 * "domain-services" node. On control nodes there is another port
471 * under "openboot" that we should not mess with as aparently that is
472 * reserved exclusively for OBP use.
473 */
474static void vio_add_ds(struct mdesc_handle *hp, u64 node,
475 const char *node_name)
476{
477 int found;
478 u64 a;
479
480 found = 0;
481 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
482 u64 target = mdesc_arc_target(hp, a);
483 const char *name = mdesc_node_name(hp, target);
484
485 if (!strcmp(name, "domain-services")) {
486 found = 1;
487 break;
488 }
489 }
490
491 if (found)
492 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
493}
494
495static struct mdesc_notifier_client vio_ds_notifier = {
496 .add = vio_add_ds,
497 .remove = vio_remove,
498 .node_name = "domain-services-port",
499};
500
501static const char *channel_devices_node = "channel-devices";
502static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
503static const char *cfg_handle_prop = "cfg-handle";
504
505static int __init vio_init(void)
506{
507 struct mdesc_handle *hp;
508 const char *compat;
509 const u64 *cfg_handle;
510 int err, len;
511 u64 root;
512
513 err = bus_register(&vio_bus_type);
514 if (err) {
515 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
516 err);
517 return err;
518 }
519
520 hp = mdesc_grab();
521 if (!hp)
522 return 0;
523
524 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
525 if (root == MDESC_NODE_NULL) {
526 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
527 mdesc_release(hp);
528 return 0;
529 }
530
531 cdev_node = of_find_node_by_name(NULL, "channel-devices");
532 err = -ENODEV;
533 if (!cdev_node) {
534 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
535 goto out_release;
536 }
537
538 compat = mdesc_get_property(hp, root, "compatible", &len);
539 if (!compat) {
540 printk(KERN_ERR "VIO: Channel devices lacks compatible "
541 "property\n");
542 goto out_release;
543 }
544 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
545 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
546 "compat entry.\n", channel_devices_compat);
547 goto out_release;
548 }
549
550 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
551 if (!cfg_handle) {
552 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
553 cfg_handle_prop);
554 goto out_release;
555 }
556
557 cdev_cfg_handle = *cfg_handle;
558
559 root_vdev = vio_create_one(hp, root, NULL, NULL);
560 err = -ENODEV;
561 if (!root_vdev) {
562 printk(KERN_ERR "VIO: Could not create root device.\n");
563 goto out_release;
564 }
565
566 mdesc_register_notifier(&vio_device_notifier);
567 mdesc_register_notifier(&vio_ds_notifier);
568
569 mdesc_release(hp);
570
571 return err;
572
573out_release:
574 mdesc_release(hp);
575 return err;
576}
577
578postcore_initcall(vio_init);
1/* vio.c: Virtual I/O channel devices probing infrastructure.
2 *
3 * Copyright (c) 2003-2005 IBM Corp.
4 * Dave Engebretsen engebret@us.ibm.com
5 * Santiago Leon santil@us.ibm.com
6 * Hollis Blanchard <hollisb@us.ibm.com>
7 * Stephen Rothwell
8 *
9 * Adapted to sparc64 by David S. Miller davem@davemloft.net
10 */
11
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/irq.h>
15#include <linux/export.h>
16#include <linux/init.h>
17
18#include <asm/mdesc.h>
19#include <asm/vio.h>
20
21static const struct vio_device_id *vio_match_device(
22 const struct vio_device_id *matches,
23 const struct vio_dev *dev)
24{
25 const char *type, *compat;
26 int len;
27
28 type = dev->type;
29 compat = dev->compat;
30 len = dev->compat_len;
31
32 while (matches->type[0] || matches->compat[0]) {
33 int match = 1;
34 if (matches->type[0])
35 match &= !strcmp(matches->type, type);
36
37 if (matches->compat[0]) {
38 match &= len &&
39 of_find_in_proplist(compat, matches->compat, len);
40 }
41 if (match)
42 return matches;
43 matches++;
44 }
45 return NULL;
46}
47
48static int vio_bus_match(struct device *dev, struct device_driver *drv)
49{
50 struct vio_dev *vio_dev = to_vio_dev(dev);
51 struct vio_driver *vio_drv = to_vio_driver(drv);
52 const struct vio_device_id *matches = vio_drv->id_table;
53
54 if (!matches)
55 return 0;
56
57 return vio_match_device(matches, vio_dev) != NULL;
58}
59
60static int vio_device_probe(struct device *dev)
61{
62 struct vio_dev *vdev = to_vio_dev(dev);
63 struct vio_driver *drv = to_vio_driver(dev->driver);
64 const struct vio_device_id *id;
65 int error = -ENODEV;
66
67 if (drv->probe) {
68 id = vio_match_device(drv->id_table, vdev);
69 if (id)
70 error = drv->probe(vdev, id);
71 }
72
73 return error;
74}
75
76static int vio_device_remove(struct device *dev)
77{
78 struct vio_dev *vdev = to_vio_dev(dev);
79 struct vio_driver *drv = to_vio_driver(dev->driver);
80
81 if (drv->remove)
82 return drv->remove(vdev);
83
84 return 1;
85}
86
87static ssize_t devspec_show(struct device *dev,
88 struct device_attribute *attr, char *buf)
89{
90 struct vio_dev *vdev = to_vio_dev(dev);
91 const char *str = "none";
92
93 if (!strcmp(vdev->type, "vnet-port"))
94 str = "vnet";
95 else if (!strcmp(vdev->type, "vdc-port"))
96 str = "vdisk";
97
98 return sprintf(buf, "%s\n", str);
99}
100
101static ssize_t type_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
103{
104 struct vio_dev *vdev = to_vio_dev(dev);
105 return sprintf(buf, "%s\n", vdev->type);
106}
107
108static struct device_attribute vio_dev_attrs[] = {
109 __ATTR_RO(devspec),
110 __ATTR_RO(type),
111 __ATTR_NULL
112};
113
114static struct bus_type vio_bus_type = {
115 .name = "vio",
116 .dev_attrs = vio_dev_attrs,
117 .match = vio_bus_match,
118 .probe = vio_device_probe,
119 .remove = vio_device_remove,
120};
121
122int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
123 const char *mod_name)
124{
125 viodrv->driver.bus = &vio_bus_type;
126 viodrv->driver.name = viodrv->name;
127 viodrv->driver.owner = owner;
128 viodrv->driver.mod_name = mod_name;
129
130 return driver_register(&viodrv->driver);
131}
132EXPORT_SYMBOL(__vio_register_driver);
133
134void vio_unregister_driver(struct vio_driver *viodrv)
135{
136 driver_unregister(&viodrv->driver);
137}
138EXPORT_SYMBOL(vio_unregister_driver);
139
140static void vio_dev_release(struct device *dev)
141{
142 kfree(to_vio_dev(dev));
143}
144
145static ssize_t
146show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
147 char *buf)
148{
149 struct vio_dev *vdev;
150 struct device_node *dp;
151
152 vdev = to_vio_dev(dev);
153 dp = vdev->dp;
154
155 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
156}
157
158static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
159 show_pciobppath_attr, NULL);
160
161static struct device_node *cdev_node;
162
163static struct vio_dev *root_vdev;
164static u64 cdev_cfg_handle;
165
166static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
167 struct vio_dev *vdev)
168{
169 u64 a;
170
171 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
172 const u64 *chan_id;
173 const u64 *irq;
174 u64 target;
175
176 target = mdesc_arc_target(hp, a);
177
178 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
179 if (irq)
180 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
181
182 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
183 if (irq)
184 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
185
186 chan_id = mdesc_get_property(hp, target, "id", NULL);
187 if (chan_id)
188 vdev->channel_id = *chan_id;
189 }
190}
191
192static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
193 struct device *parent)
194{
195 const char *type, *compat, *bus_id_name;
196 struct device_node *dp;
197 struct vio_dev *vdev;
198 int err, tlen, clen;
199 const u64 *id, *cfg_handle;
200 u64 a;
201
202 type = mdesc_get_property(hp, mp, "device-type", &tlen);
203 if (!type) {
204 type = mdesc_get_property(hp, mp, "name", &tlen);
205 if (!type) {
206 type = mdesc_node_name(hp, mp);
207 tlen = strlen(type) + 1;
208 }
209 }
210 if (tlen > VIO_MAX_TYPE_LEN) {
211 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
212 type);
213 return NULL;
214 }
215
216 id = mdesc_get_property(hp, mp, "id", NULL);
217
218 cfg_handle = NULL;
219 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
220 u64 target;
221
222 target = mdesc_arc_target(hp, a);
223 cfg_handle = mdesc_get_property(hp, target,
224 "cfg-handle", NULL);
225 if (cfg_handle)
226 break;
227 }
228
229 bus_id_name = type;
230 if (!strcmp(type, "domain-services-port"))
231 bus_id_name = "ds";
232
233 /*
234 * 20 char is the old driver-core name size limit, which is no more.
235 * This check can probably be removed after review and possible
236 * adaption of the vio users name length handling.
237 */
238 if (strlen(bus_id_name) >= 20 - 4) {
239 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
240 bus_id_name);
241 return NULL;
242 }
243
244 compat = mdesc_get_property(hp, mp, "device-type", &clen);
245 if (!compat) {
246 clen = 0;
247 } else if (clen > VIO_MAX_COMPAT_LEN) {
248 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
249 clen, type);
250 return NULL;
251 }
252
253 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
254 if (!vdev) {
255 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
256 return NULL;
257 }
258
259 vdev->mp = mp;
260 memcpy(vdev->type, type, tlen);
261 if (compat)
262 memcpy(vdev->compat, compat, clen);
263 else
264 memset(vdev->compat, 0, sizeof(vdev->compat));
265 vdev->compat_len = clen;
266
267 vdev->channel_id = ~0UL;
268 vdev->tx_irq = ~0;
269 vdev->rx_irq = ~0;
270
271 vio_fill_channel_info(hp, mp, vdev);
272
273 if (!id) {
274 dev_set_name(&vdev->dev, "%s", bus_id_name);
275 vdev->dev_no = ~(u64)0;
276 } else if (!cfg_handle) {
277 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
278 vdev->dev_no = *id;
279 } else {
280 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
281 *cfg_handle, *id);
282 vdev->dev_no = *cfg_handle;
283 }
284
285 vdev->dev.parent = parent;
286 vdev->dev.bus = &vio_bus_type;
287 vdev->dev.release = vio_dev_release;
288
289 if (parent == NULL) {
290 dp = cdev_node;
291 } else if (to_vio_dev(parent) == root_vdev) {
292 dp = of_get_next_child(cdev_node, NULL);
293 while (dp) {
294 if (!strcmp(dp->type, type))
295 break;
296
297 dp = of_get_next_child(cdev_node, dp);
298 }
299 } else {
300 dp = to_vio_dev(parent)->dp;
301 }
302 vdev->dp = dp;
303
304 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
305
306 err = device_register(&vdev->dev);
307 if (err) {
308 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
309 dev_name(&vdev->dev), err);
310 kfree(vdev);
311 return NULL;
312 }
313 if (vdev->dp)
314 err = sysfs_create_file(&vdev->dev.kobj,
315 &dev_attr_obppath.attr);
316
317 return vdev;
318}
319
320static void vio_add(struct mdesc_handle *hp, u64 node)
321{
322 (void) vio_create_one(hp, node, &root_vdev->dev);
323}
324
325static int vio_md_node_match(struct device *dev, void *arg)
326{
327 struct vio_dev *vdev = to_vio_dev(dev);
328
329 if (vdev->mp == (u64) arg)
330 return 1;
331
332 return 0;
333}
334
335static void vio_remove(struct mdesc_handle *hp, u64 node)
336{
337 struct device *dev;
338
339 dev = device_find_child(&root_vdev->dev, (void *) node,
340 vio_md_node_match);
341 if (dev) {
342 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
343
344 device_unregister(dev);
345 put_device(dev);
346 }
347}
348
349static struct mdesc_notifier_client vio_device_notifier = {
350 .add = vio_add,
351 .remove = vio_remove,
352 .node_name = "virtual-device-port",
353};
354
355/* We are only interested in domain service ports under the
356 * "domain-services" node. On control nodes there is another port
357 * under "openboot" that we should not mess with as aparently that is
358 * reserved exclusively for OBP use.
359 */
360static void vio_add_ds(struct mdesc_handle *hp, u64 node)
361{
362 int found;
363 u64 a;
364
365 found = 0;
366 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
367 u64 target = mdesc_arc_target(hp, a);
368 const char *name = mdesc_node_name(hp, target);
369
370 if (!strcmp(name, "domain-services")) {
371 found = 1;
372 break;
373 }
374 }
375
376 if (found)
377 (void) vio_create_one(hp, node, &root_vdev->dev);
378}
379
380static struct mdesc_notifier_client vio_ds_notifier = {
381 .add = vio_add_ds,
382 .remove = vio_remove,
383 .node_name = "domain-services-port",
384};
385
386static const char *channel_devices_node = "channel-devices";
387static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
388static const char *cfg_handle_prop = "cfg-handle";
389
390static int __init vio_init(void)
391{
392 struct mdesc_handle *hp;
393 const char *compat;
394 const u64 *cfg_handle;
395 int err, len;
396 u64 root;
397
398 err = bus_register(&vio_bus_type);
399 if (err) {
400 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
401 err);
402 return err;
403 }
404
405 hp = mdesc_grab();
406 if (!hp)
407 return 0;
408
409 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
410 if (root == MDESC_NODE_NULL) {
411 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
412 mdesc_release(hp);
413 return 0;
414 }
415
416 cdev_node = of_find_node_by_name(NULL, "channel-devices");
417 err = -ENODEV;
418 if (!cdev_node) {
419 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
420 goto out_release;
421 }
422
423 compat = mdesc_get_property(hp, root, "compatible", &len);
424 if (!compat) {
425 printk(KERN_ERR "VIO: Channel devices lacks compatible "
426 "property\n");
427 goto out_release;
428 }
429 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
430 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
431 "compat entry.\n", channel_devices_compat);
432 goto out_release;
433 }
434
435 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
436 if (!cfg_handle) {
437 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
438 cfg_handle_prop);
439 goto out_release;
440 }
441
442 cdev_cfg_handle = *cfg_handle;
443
444 root_vdev = vio_create_one(hp, root, NULL);
445 err = -ENODEV;
446 if (!root_vdev) {
447 printk(KERN_ERR "VIO: Could not create root device.\n");
448 goto out_release;
449 }
450
451 mdesc_register_notifier(&vio_device_notifier);
452 mdesc_register_notifier(&vio_ds_notifier);
453
454 mdesc_release(hp);
455
456 return err;
457
458out_release:
459 mdesc_release(hp);
460 return err;
461}
462
463postcore_initcall(vio_init);