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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 }
346}
347
348static struct mdesc_notifier_client vio_device_notifier = {
349 .add = vio_add,
350 .remove = vio_remove,
351 .node_name = "virtual-device-port",
352};
353
354/* We are only interested in domain service ports under the
355 * "domain-services" node. On control nodes there is another port
356 * under "openboot" that we should not mess with as aparently that is
357 * reserved exclusively for OBP use.
358 */
359static void vio_add_ds(struct mdesc_handle *hp, u64 node)
360{
361 int found;
362 u64 a;
363
364 found = 0;
365 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
366 u64 target = mdesc_arc_target(hp, a);
367 const char *name = mdesc_node_name(hp, target);
368
369 if (!strcmp(name, "domain-services")) {
370 found = 1;
371 break;
372 }
373 }
374
375 if (found)
376 (void) vio_create_one(hp, node, &root_vdev->dev);
377}
378
379static struct mdesc_notifier_client vio_ds_notifier = {
380 .add = vio_add_ds,
381 .remove = vio_remove,
382 .node_name = "domain-services-port",
383};
384
385static const char *channel_devices_node = "channel-devices";
386static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
387static const char *cfg_handle_prop = "cfg-handle";
388
389static int __init vio_init(void)
390{
391 struct mdesc_handle *hp;
392 const char *compat;
393 const u64 *cfg_handle;
394 int err, len;
395 u64 root;
396
397 err = bus_register(&vio_bus_type);
398 if (err) {
399 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
400 err);
401 return err;
402 }
403
404 hp = mdesc_grab();
405 if (!hp)
406 return 0;
407
408 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
409 if (root == MDESC_NODE_NULL) {
410 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
411 mdesc_release(hp);
412 return 0;
413 }
414
415 cdev_node = of_find_node_by_name(NULL, "channel-devices");
416 err = -ENODEV;
417 if (!cdev_node) {
418 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
419 goto out_release;
420 }
421
422 compat = mdesc_get_property(hp, root, "compatible", &len);
423 if (!compat) {
424 printk(KERN_ERR "VIO: Channel devices lacks compatible "
425 "property\n");
426 goto out_release;
427 }
428 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
429 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
430 "compat entry.\n", channel_devices_compat);
431 goto out_release;
432 }
433
434 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
435 if (!cfg_handle) {
436 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
437 cfg_handle_prop);
438 goto out_release;
439 }
440
441 cdev_cfg_handle = *cfg_handle;
442
443 root_vdev = vio_create_one(hp, root, NULL);
444 err = -ENODEV;
445 if (!root_vdev) {
446 printk(KERN_ERR "VIO: Could not create root device.\n");
447 goto out_release;
448 }
449
450 mdesc_register_notifier(&vio_device_notifier);
451 mdesc_register_notifier(&vio_ds_notifier);
452
453 mdesc_release(hp);
454
455 return err;
456
457out_release:
458 mdesc_release(hp);
459 return err;
460}
461
462postcore_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/init.h>
16
17#include <asm/mdesc.h>
18#include <asm/vio.h>
19
20static const struct vio_device_id *vio_match_device(
21 const struct vio_device_id *matches,
22 const struct vio_dev *dev)
23{
24 const char *type, *compat;
25 int len;
26
27 type = dev->type;
28 compat = dev->compat;
29 len = dev->compat_len;
30
31 while (matches->type[0] || matches->compat[0]) {
32 int match = 1;
33 if (matches->type[0])
34 match &= !strcmp(matches->type, type);
35
36 if (matches->compat[0]) {
37 match &= len &&
38 of_find_in_proplist(compat, matches->compat, len);
39 }
40 if (match)
41 return matches;
42 matches++;
43 }
44 return NULL;
45}
46
47static int vio_bus_match(struct device *dev, struct device_driver *drv)
48{
49 struct vio_dev *vio_dev = to_vio_dev(dev);
50 struct vio_driver *vio_drv = to_vio_driver(drv);
51 const struct vio_device_id *matches = vio_drv->id_table;
52
53 if (!matches)
54 return 0;
55
56 return vio_match_device(matches, vio_dev) != NULL;
57}
58
59static int vio_device_probe(struct device *dev)
60{
61 struct vio_dev *vdev = to_vio_dev(dev);
62 struct vio_driver *drv = to_vio_driver(dev->driver);
63 const struct vio_device_id *id;
64 int error = -ENODEV;
65
66 if (drv->probe) {
67 id = vio_match_device(drv->id_table, vdev);
68 if (id)
69 error = drv->probe(vdev, id);
70 }
71
72 return error;
73}
74
75static int vio_device_remove(struct device *dev)
76{
77 struct vio_dev *vdev = to_vio_dev(dev);
78 struct vio_driver *drv = to_vio_driver(dev->driver);
79
80 if (drv->remove)
81 return drv->remove(vdev);
82
83 return 1;
84}
85
86static ssize_t devspec_show(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 struct vio_dev *vdev = to_vio_dev(dev);
90 const char *str = "none";
91
92 if (!strcmp(vdev->type, "vnet-port"))
93 str = "vnet";
94 else if (!strcmp(vdev->type, "vdc-port"))
95 str = "vdisk";
96
97 return sprintf(buf, "%s\n", str);
98}
99
100static ssize_t type_show(struct device *dev,
101 struct device_attribute *attr, char *buf)
102{
103 struct vio_dev *vdev = to_vio_dev(dev);
104 return sprintf(buf, "%s\n", vdev->type);
105}
106
107static struct device_attribute vio_dev_attrs[] = {
108 __ATTR_RO(devspec),
109 __ATTR_RO(type),
110 __ATTR_NULL
111};
112
113static struct bus_type vio_bus_type = {
114 .name = "vio",
115 .dev_attrs = vio_dev_attrs,
116 .match = vio_bus_match,
117 .probe = vio_device_probe,
118 .remove = vio_device_remove,
119};
120
121int vio_register_driver(struct vio_driver *viodrv)
122{
123 viodrv->driver.bus = &vio_bus_type;
124
125 return driver_register(&viodrv->driver);
126}
127EXPORT_SYMBOL(vio_register_driver);
128
129void vio_unregister_driver(struct vio_driver *viodrv)
130{
131 driver_unregister(&viodrv->driver);
132}
133EXPORT_SYMBOL(vio_unregister_driver);
134
135static void vio_dev_release(struct device *dev)
136{
137 kfree(to_vio_dev(dev));
138}
139
140static ssize_t
141show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
142 char *buf)
143{
144 struct vio_dev *vdev;
145 struct device_node *dp;
146
147 vdev = to_vio_dev(dev);
148 dp = vdev->dp;
149
150 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
151}
152
153static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
154 show_pciobppath_attr, NULL);
155
156static struct device_node *cdev_node;
157
158static struct vio_dev *root_vdev;
159static u64 cdev_cfg_handle;
160
161static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
162 struct vio_dev *vdev)
163{
164 u64 a;
165
166 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
167 const u64 *chan_id;
168 const u64 *irq;
169 u64 target;
170
171 target = mdesc_arc_target(hp, a);
172
173 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
174 if (irq)
175 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
176
177 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
178 if (irq)
179 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
180
181 chan_id = mdesc_get_property(hp, target, "id", NULL);
182 if (chan_id)
183 vdev->channel_id = *chan_id;
184 }
185}
186
187static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
188 struct device *parent)
189{
190 const char *type, *compat, *bus_id_name;
191 struct device_node *dp;
192 struct vio_dev *vdev;
193 int err, tlen, clen;
194 const u64 *id, *cfg_handle;
195 u64 a;
196
197 type = mdesc_get_property(hp, mp, "device-type", &tlen);
198 if (!type) {
199 type = mdesc_get_property(hp, mp, "name", &tlen);
200 if (!type) {
201 type = mdesc_node_name(hp, mp);
202 tlen = strlen(type) + 1;
203 }
204 }
205 if (tlen > VIO_MAX_TYPE_LEN) {
206 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
207 type);
208 return NULL;
209 }
210
211 id = mdesc_get_property(hp, mp, "id", NULL);
212
213 cfg_handle = NULL;
214 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
215 u64 target;
216
217 target = mdesc_arc_target(hp, a);
218 cfg_handle = mdesc_get_property(hp, target,
219 "cfg-handle", NULL);
220 if (cfg_handle)
221 break;
222 }
223
224 bus_id_name = type;
225 if (!strcmp(type, "domain-services-port"))
226 bus_id_name = "ds";
227
228 /*
229 * 20 char is the old driver-core name size limit, which is no more.
230 * This check can probably be removed after review and possible
231 * adaption of the vio users name length handling.
232 */
233 if (strlen(bus_id_name) >= 20 - 4) {
234 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
235 bus_id_name);
236 return NULL;
237 }
238
239 compat = mdesc_get_property(hp, mp, "device-type", &clen);
240 if (!compat) {
241 clen = 0;
242 } else if (clen > VIO_MAX_COMPAT_LEN) {
243 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
244 clen, type);
245 return NULL;
246 }
247
248 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
249 if (!vdev) {
250 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
251 return NULL;
252 }
253
254 vdev->mp = mp;
255 memcpy(vdev->type, type, tlen);
256 if (compat)
257 memcpy(vdev->compat, compat, clen);
258 else
259 memset(vdev->compat, 0, sizeof(vdev->compat));
260 vdev->compat_len = clen;
261
262 vdev->channel_id = ~0UL;
263 vdev->tx_irq = ~0;
264 vdev->rx_irq = ~0;
265
266 vio_fill_channel_info(hp, mp, vdev);
267
268 if (!id) {
269 dev_set_name(&vdev->dev, "%s", bus_id_name);
270 vdev->dev_no = ~(u64)0;
271 } else if (!cfg_handle) {
272 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
273 vdev->dev_no = *id;
274 } else {
275 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
276 *cfg_handle, *id);
277 vdev->dev_no = *cfg_handle;
278 }
279
280 vdev->dev.parent = parent;
281 vdev->dev.bus = &vio_bus_type;
282 vdev->dev.release = vio_dev_release;
283
284 if (parent == NULL) {
285 dp = cdev_node;
286 } else if (to_vio_dev(parent) == root_vdev) {
287 dp = of_get_next_child(cdev_node, NULL);
288 while (dp) {
289 if (!strcmp(dp->type, type))
290 break;
291
292 dp = of_get_next_child(cdev_node, dp);
293 }
294 } else {
295 dp = to_vio_dev(parent)->dp;
296 }
297 vdev->dp = dp;
298
299 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
300
301 err = device_register(&vdev->dev);
302 if (err) {
303 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
304 dev_name(&vdev->dev), err);
305 kfree(vdev);
306 return NULL;
307 }
308 if (vdev->dp)
309 err = sysfs_create_file(&vdev->dev.kobj,
310 &dev_attr_obppath.attr);
311
312 return vdev;
313}
314
315static void vio_add(struct mdesc_handle *hp, u64 node)
316{
317 (void) vio_create_one(hp, node, &root_vdev->dev);
318}
319
320static int vio_md_node_match(struct device *dev, void *arg)
321{
322 struct vio_dev *vdev = to_vio_dev(dev);
323
324 if (vdev->mp == (u64) arg)
325 return 1;
326
327 return 0;
328}
329
330static void vio_remove(struct mdesc_handle *hp, u64 node)
331{
332 struct device *dev;
333
334 dev = device_find_child(&root_vdev->dev, (void *) node,
335 vio_md_node_match);
336 if (dev) {
337 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
338
339 device_unregister(dev);
340 }
341}
342
343static struct mdesc_notifier_client vio_device_notifier = {
344 .add = vio_add,
345 .remove = vio_remove,
346 .node_name = "virtual-device-port",
347};
348
349/* We are only interested in domain service ports under the
350 * "domain-services" node. On control nodes there is another port
351 * under "openboot" that we should not mess with as aparently that is
352 * reserved exclusively for OBP use.
353 */
354static void vio_add_ds(struct mdesc_handle *hp, u64 node)
355{
356 int found;
357 u64 a;
358
359 found = 0;
360 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
361 u64 target = mdesc_arc_target(hp, a);
362 const char *name = mdesc_node_name(hp, target);
363
364 if (!strcmp(name, "domain-services")) {
365 found = 1;
366 break;
367 }
368 }
369
370 if (found)
371 (void) vio_create_one(hp, node, &root_vdev->dev);
372}
373
374static struct mdesc_notifier_client vio_ds_notifier = {
375 .add = vio_add_ds,
376 .remove = vio_remove,
377 .node_name = "domain-services-port",
378};
379
380static const char *channel_devices_node = "channel-devices";
381static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
382static const char *cfg_handle_prop = "cfg-handle";
383
384static int __init vio_init(void)
385{
386 struct mdesc_handle *hp;
387 const char *compat;
388 const u64 *cfg_handle;
389 int err, len;
390 u64 root;
391
392 err = bus_register(&vio_bus_type);
393 if (err) {
394 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
395 err);
396 return err;
397 }
398
399 hp = mdesc_grab();
400 if (!hp)
401 return 0;
402
403 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
404 if (root == MDESC_NODE_NULL) {
405 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
406 mdesc_release(hp);
407 return 0;
408 }
409
410 cdev_node = of_find_node_by_name(NULL, "channel-devices");
411 err = -ENODEV;
412 if (!cdev_node) {
413 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
414 goto out_release;
415 }
416
417 compat = mdesc_get_property(hp, root, "compatible", &len);
418 if (!compat) {
419 printk(KERN_ERR "VIO: Channel devices lacks compatible "
420 "property\n");
421 goto out_release;
422 }
423 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
424 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
425 "compat entry.\n", channel_devices_compat);
426 goto out_release;
427 }
428
429 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
430 if (!cfg_handle) {
431 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
432 cfg_handle_prop);
433 goto out_release;
434 }
435
436 cdev_cfg_handle = *cfg_handle;
437
438 root_vdev = vio_create_one(hp, root, NULL);
439 err = -ENODEV;
440 if (!root_vdev) {
441 printk(KERN_ERR "VIO: Coult not create root device.\n");
442 goto out_release;
443 }
444
445 mdesc_register_notifier(&vio_device_notifier);
446 mdesc_register_notifier(&vio_ds_notifier);
447
448 mdesc_release(hp);
449
450 return err;
451
452out_release:
453 mdesc_release(hp);
454 return err;
455}
456
457postcore_initcall(vio_init);