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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/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);
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_hotplug(struct device *dev, struct kobj_uevent_env *env)
49{
50 const struct vio_dev *vio_dev = to_vio_dev(dev);
51
52 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
53 return 0;
54}
55
56static int vio_bus_match(struct device *dev, struct device_driver *drv)
57{
58 struct vio_dev *vio_dev = to_vio_dev(dev);
59 struct vio_driver *vio_drv = to_vio_driver(drv);
60 const struct vio_device_id *matches = vio_drv->id_table;
61
62 if (!matches)
63 return 0;
64
65 return vio_match_device(matches, vio_dev) != NULL;
66}
67
68static int vio_device_probe(struct device *dev)
69{
70 struct vio_dev *vdev = to_vio_dev(dev);
71 struct vio_driver *drv = to_vio_driver(dev->driver);
72 const struct vio_device_id *id;
73 int error = -ENODEV;
74
75 if (drv->probe) {
76 id = vio_match_device(drv->id_table, vdev);
77 if (id)
78 error = drv->probe(vdev, id);
79 }
80
81 return error;
82}
83
84static int vio_device_remove(struct device *dev)
85{
86 struct vio_dev *vdev = to_vio_dev(dev);
87 struct vio_driver *drv = to_vio_driver(dev->driver);
88
89 if (drv->remove)
90 return drv->remove(vdev);
91
92 return 1;
93}
94
95static ssize_t devspec_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
97{
98 struct vio_dev *vdev = to_vio_dev(dev);
99 const char *str = "none";
100
101 if (!strcmp(vdev->type, "vnet-port"))
102 str = "vnet";
103 else if (!strcmp(vdev->type, "vdc-port"))
104 str = "vdisk";
105
106 return sprintf(buf, "%s\n", str);
107}
108
109static ssize_t type_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 struct vio_dev *vdev = to_vio_dev(dev);
113 return sprintf(buf, "%s\n", vdev->type);
114}
115
116static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118{
119 const struct vio_dev *vdev = to_vio_dev(dev);
120
121 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
122}
123
124static struct device_attribute vio_dev_attrs[] = {
125 __ATTR_RO(devspec),
126 __ATTR_RO(type),
127 __ATTR_RO(modalias),
128 __ATTR_NULL
129};
130
131static struct bus_type vio_bus_type = {
132 .name = "vio",
133 .dev_attrs = vio_dev_attrs,
134 .uevent = vio_hotplug,
135 .match = vio_bus_match,
136 .probe = vio_device_probe,
137 .remove = vio_device_remove,
138};
139
140int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
141 const char *mod_name)
142{
143 viodrv->driver.bus = &vio_bus_type;
144 viodrv->driver.name = viodrv->name;
145 viodrv->driver.owner = owner;
146 viodrv->driver.mod_name = mod_name;
147
148 return driver_register(&viodrv->driver);
149}
150EXPORT_SYMBOL(__vio_register_driver);
151
152void vio_unregister_driver(struct vio_driver *viodrv)
153{
154 driver_unregister(&viodrv->driver);
155}
156EXPORT_SYMBOL(vio_unregister_driver);
157
158static void vio_dev_release(struct device *dev)
159{
160 kfree(to_vio_dev(dev));
161}
162
163static ssize_t
164show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
165 char *buf)
166{
167 struct vio_dev *vdev;
168 struct device_node *dp;
169
170 vdev = to_vio_dev(dev);
171 dp = vdev->dp;
172
173 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
174}
175
176static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
177 show_pciobppath_attr, NULL);
178
179static struct device_node *cdev_node;
180
181static struct vio_dev *root_vdev;
182static u64 cdev_cfg_handle;
183
184static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
185 struct vio_dev *vdev)
186{
187 u64 a;
188
189 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
190 const u64 *chan_id;
191 const u64 *irq;
192 u64 target;
193
194 target = mdesc_arc_target(hp, a);
195
196 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
197 if (irq)
198 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
199
200 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
201 if (irq) {
202 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
203 vdev->rx_ino = *irq;
204 }
205
206 chan_id = mdesc_get_property(hp, target, "id", NULL);
207 if (chan_id)
208 vdev->channel_id = *chan_id;
209 }
210}
211
212int vio_set_intr(unsigned long dev_ino, int state)
213{
214 int err;
215
216 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
217 return err;
218}
219EXPORT_SYMBOL(vio_set_intr);
220
221static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
222 struct device *parent)
223{
224 const char *type, *compat, *bus_id_name;
225 struct device_node *dp;
226 struct vio_dev *vdev;
227 int err, tlen, clen;
228 const u64 *id, *cfg_handle;
229 u64 a;
230
231 type = mdesc_get_property(hp, mp, "device-type", &tlen);
232 if (!type) {
233 type = mdesc_get_property(hp, mp, "name", &tlen);
234 if (!type) {
235 type = mdesc_node_name(hp, mp);
236 tlen = strlen(type) + 1;
237 }
238 }
239 if (tlen > VIO_MAX_TYPE_LEN) {
240 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
241 type);
242 return NULL;
243 }
244
245 id = mdesc_get_property(hp, mp, "id", NULL);
246
247 cfg_handle = NULL;
248 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
249 u64 target;
250
251 target = mdesc_arc_target(hp, a);
252 cfg_handle = mdesc_get_property(hp, target,
253 "cfg-handle", NULL);
254 if (cfg_handle)
255 break;
256 }
257
258 bus_id_name = type;
259 if (!strcmp(type, "domain-services-port"))
260 bus_id_name = "ds";
261
262 /*
263 * 20 char is the old driver-core name size limit, which is no more.
264 * This check can probably be removed after review and possible
265 * adaption of the vio users name length handling.
266 */
267 if (strlen(bus_id_name) >= 20 - 4) {
268 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
269 bus_id_name);
270 return NULL;
271 }
272
273 compat = mdesc_get_property(hp, mp, "device-type", &clen);
274 if (!compat) {
275 clen = 0;
276 } else if (clen > VIO_MAX_COMPAT_LEN) {
277 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
278 clen, type);
279 return NULL;
280 }
281
282 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
283 if (!vdev) {
284 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
285 return NULL;
286 }
287
288 vdev->mp = mp;
289 memcpy(vdev->type, type, tlen);
290 if (compat)
291 memcpy(vdev->compat, compat, clen);
292 else
293 memset(vdev->compat, 0, sizeof(vdev->compat));
294 vdev->compat_len = clen;
295
296 vdev->channel_id = ~0UL;
297 vdev->tx_irq = ~0;
298 vdev->rx_irq = ~0;
299
300 vio_fill_channel_info(hp, mp, vdev);
301
302 if (!id) {
303 dev_set_name(&vdev->dev, "%s", bus_id_name);
304 vdev->dev_no = ~(u64)0;
305 } else if (!cfg_handle) {
306 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
307 vdev->dev_no = *id;
308 } else {
309 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
310 *cfg_handle, *id);
311 vdev->dev_no = *cfg_handle;
312 }
313
314 vdev->dev.parent = parent;
315 vdev->dev.bus = &vio_bus_type;
316 vdev->dev.release = vio_dev_release;
317
318 if (parent == NULL) {
319 dp = cdev_node;
320 } else if (to_vio_dev(parent) == root_vdev) {
321 dp = of_get_next_child(cdev_node, NULL);
322 while (dp) {
323 if (!strcmp(dp->type, type))
324 break;
325
326 dp = of_get_next_child(cdev_node, dp);
327 }
328 } else {
329 dp = to_vio_dev(parent)->dp;
330 }
331 vdev->dp = dp;
332
333 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
334
335 err = device_register(&vdev->dev);
336 if (err) {
337 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
338 dev_name(&vdev->dev), err);
339 kfree(vdev);
340 return NULL;
341 }
342 if (vdev->dp)
343 err = sysfs_create_file(&vdev->dev.kobj,
344 &dev_attr_obppath.attr);
345
346 return vdev;
347}
348
349static void vio_add(struct mdesc_handle *hp, u64 node)
350{
351 (void) vio_create_one(hp, node, &root_vdev->dev);
352}
353
354static int vio_md_node_match(struct device *dev, void *arg)
355{
356 struct vio_dev *vdev = to_vio_dev(dev);
357
358 if (vdev->mp == (u64) arg)
359 return 1;
360
361 return 0;
362}
363
364static void vio_remove(struct mdesc_handle *hp, u64 node)
365{
366 struct device *dev;
367
368 dev = device_find_child(&root_vdev->dev, (void *) node,
369 vio_md_node_match);
370 if (dev) {
371 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
372
373 device_unregister(dev);
374 put_device(dev);
375 }
376}
377
378static struct mdesc_notifier_client vio_device_notifier = {
379 .add = vio_add,
380 .remove = vio_remove,
381 .node_name = "virtual-device-port",
382};
383
384/* We are only interested in domain service ports under the
385 * "domain-services" node. On control nodes there is another port
386 * under "openboot" that we should not mess with as aparently that is
387 * reserved exclusively for OBP use.
388 */
389static void vio_add_ds(struct mdesc_handle *hp, u64 node)
390{
391 int found;
392 u64 a;
393
394 found = 0;
395 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
396 u64 target = mdesc_arc_target(hp, a);
397 const char *name = mdesc_node_name(hp, target);
398
399 if (!strcmp(name, "domain-services")) {
400 found = 1;
401 break;
402 }
403 }
404
405 if (found)
406 (void) vio_create_one(hp, node, &root_vdev->dev);
407}
408
409static struct mdesc_notifier_client vio_ds_notifier = {
410 .add = vio_add_ds,
411 .remove = vio_remove,
412 .node_name = "domain-services-port",
413};
414
415static const char *channel_devices_node = "channel-devices";
416static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
417static const char *cfg_handle_prop = "cfg-handle";
418
419static int __init vio_init(void)
420{
421 struct mdesc_handle *hp;
422 const char *compat;
423 const u64 *cfg_handle;
424 int err, len;
425 u64 root;
426
427 err = bus_register(&vio_bus_type);
428 if (err) {
429 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
430 err);
431 return err;
432 }
433
434 hp = mdesc_grab();
435 if (!hp)
436 return 0;
437
438 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
439 if (root == MDESC_NODE_NULL) {
440 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
441 mdesc_release(hp);
442 return 0;
443 }
444
445 cdev_node = of_find_node_by_name(NULL, "channel-devices");
446 err = -ENODEV;
447 if (!cdev_node) {
448 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
449 goto out_release;
450 }
451
452 compat = mdesc_get_property(hp, root, "compatible", &len);
453 if (!compat) {
454 printk(KERN_ERR "VIO: Channel devices lacks compatible "
455 "property\n");
456 goto out_release;
457 }
458 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
459 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
460 "compat entry.\n", channel_devices_compat);
461 goto out_release;
462 }
463
464 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
465 if (!cfg_handle) {
466 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
467 cfg_handle_prop);
468 goto out_release;
469 }
470
471 cdev_cfg_handle = *cfg_handle;
472
473 root_vdev = vio_create_one(hp, root, NULL);
474 err = -ENODEV;
475 if (!root_vdev) {
476 printk(KERN_ERR "VIO: Could not create root device.\n");
477 goto out_release;
478 }
479
480 mdesc_register_notifier(&vio_device_notifier);
481 mdesc_register_notifier(&vio_ds_notifier);
482
483 mdesc_release(hp);
484
485 return err;
486
487out_release:
488 mdesc_release(hp);
489 return err;
490}
491
492postcore_initcall(vio_init);