Commit | Line | Data |
---|---|---|
e53e97ce DM |
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> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
e53e97ce | 14 | #include <linux/irq.h> |
7b64db60 | 15 | #include <linux/export.h> |
e53e97ce DM |
16 | #include <linux/init.h> |
17 | ||
18 | #include <asm/mdesc.h> | |
19 | #include <asm/vio.h> | |
20 | ||
e53e97ce DM |
21 | static 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; | |
83292e0a DM |
34 | if (matches->type[0]) |
35 | match &= !strcmp(matches->type, type); | |
36 | ||
e53e97ce | 37 | if (matches->compat[0]) { |
83292e0a | 38 | match &= len && |
46bcea77 | 39 | of_find_in_proplist(compat, matches->compat, len); |
e53e97ce DM |
40 | } |
41 | if (match) | |
42 | return matches; | |
43 | matches++; | |
44 | } | |
45 | return NULL; | |
46 | } | |
47 | ||
48 | static 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 | ||
60 | static 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 | ||
76 | static 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 | ||
87 | static 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 | ||
48db7b7c | 93 | if (!strcmp(vdev->type, "vnet-port")) |
2c4f4ecb | 94 | str = "vnet"; |
48db7b7c | 95 | else if (!strcmp(vdev->type, "vdc-port")) |
2c4f4ecb | 96 | str = "vdisk"; |
e53e97ce DM |
97 | |
98 | return sprintf(buf, "%s\n", str); | |
99 | } | |
100 | ||
2c4f4ecb DM |
101 | static 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 | ||
e53e97ce DM |
108 | static struct device_attribute vio_dev_attrs[] = { |
109 | __ATTR_RO(devspec), | |
2c4f4ecb | 110 | __ATTR_RO(type), |
e53e97ce DM |
111 | __ATTR_NULL |
112 | }; | |
113 | ||
114 | static 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 | ||
cb52d897 BH |
122 | int __vio_register_driver(struct vio_driver *viodrv, struct module *owner, |
123 | const char *mod_name) | |
e53e97ce DM |
124 | { |
125 | viodrv->driver.bus = &vio_bus_type; | |
cb52d897 BH |
126 | viodrv->driver.name = viodrv->name; |
127 | viodrv->driver.owner = owner; | |
128 | viodrv->driver.mod_name = mod_name; | |
e53e97ce DM |
129 | |
130 | return driver_register(&viodrv->driver); | |
131 | } | |
cb52d897 | 132 | EXPORT_SYMBOL(__vio_register_driver); |
e53e97ce DM |
133 | |
134 | void vio_unregister_driver(struct vio_driver *viodrv) | |
135 | { | |
136 | driver_unregister(&viodrv->driver); | |
137 | } | |
138 | EXPORT_SYMBOL(vio_unregister_driver); | |
139 | ||
a1f35ba3 | 140 | static void vio_dev_release(struct device *dev) |
e53e97ce DM |
141 | { |
142 | kfree(to_vio_dev(dev)); | |
143 | } | |
144 | ||
145 | static ssize_t | |
146 | show_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 | ||
158 | static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, | |
159 | show_pciobppath_attr, NULL); | |
160 | ||
7694b024 | 161 | static struct device_node *cdev_node; |
e53e97ce DM |
162 | |
163 | static struct vio_dev *root_vdev; | |
164 | static u64 cdev_cfg_handle; | |
165 | ||
43fdf274 DM |
166 | static 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 | ||
192 | static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, | |
e53e97ce DM |
193 | struct device *parent) |
194 | { | |
6160f635 | 195 | const char *type, *compat, *bus_id_name; |
e53e97ce DM |
196 | struct device_node *dp; |
197 | struct vio_dev *vdev; | |
83292e0a | 198 | int err, tlen, clen; |
58fb6666 DM |
199 | const u64 *id, *cfg_handle; |
200 | u64 a; | |
e53e97ce | 201 | |
83292e0a | 202 | type = mdesc_get_property(hp, mp, "device-type", &tlen); |
2c4f4ecb | 203 | if (!type) { |
83292e0a DM |
204 | type = mdesc_get_property(hp, mp, "name", &tlen); |
205 | if (!type) { | |
43fdf274 | 206 | type = mdesc_node_name(hp, mp); |
83292e0a DM |
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; | |
2c4f4ecb | 214 | } |
83292e0a | 215 | |
58fb6666 | 216 | id = mdesc_get_property(hp, mp, "id", NULL); |
91ba3c21 | 217 | |
58fb6666 DM |
218 | cfg_handle = NULL; |
219 | mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { | |
220 | u64 target; | |
91ba3c21 | 221 | |
58fb6666 DM |
222 | target = mdesc_arc_target(hp, a); |
223 | cfg_handle = mdesc_get_property(hp, target, | |
91ba3c21 | 224 | "cfg-handle", NULL); |
58fb6666 DM |
225 | if (cfg_handle) |
226 | break; | |
227 | } | |
91ba3c21 | 228 | |
6160f635 DM |
229 | bus_id_name = type; |
230 | if (!strcmp(type, "domain-services-port")) | |
231 | bus_id_name = "ds"; | |
232 | ||
08f42877 KS |
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) { | |
6160f635 DM |
239 | printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", |
240 | bus_id_name); | |
241 | return NULL; | |
242 | } | |
243 | ||
43fdf274 | 244 | compat = mdesc_get_property(hp, mp, "device-type", &clen); |
83292e0a DM |
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 | } | |
e53e97ce DM |
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; | |
83292e0a DM |
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)); | |
e53e97ce DM |
265 | vdev->compat_len = clen; |
266 | ||
43fdf274 DM |
267 | vdev->channel_id = ~0UL; |
268 | vdev->tx_irq = ~0; | |
269 | vdev->rx_irq = ~0; | |
e53e97ce | 270 | |
43fdf274 | 271 | vio_fill_channel_info(hp, mp, vdev); |
e53e97ce | 272 | |
91ba3c21 | 273 | if (!id) { |
2222c313 | 274 | dev_set_name(&vdev->dev, "%s", bus_id_name); |
91ba3c21 | 275 | vdev->dev_no = ~(u64)0; |
58fb6666 | 276 | } else if (!cfg_handle) { |
90181136 | 277 | dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id); |
91ba3c21 | 278 | vdev->dev_no = *id; |
58fb6666 | 279 | } else { |
90181136 | 280 | dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name, |
2222c313 | 281 | *cfg_handle, *id); |
58fb6666 | 282 | vdev->dev_no = *cfg_handle; |
91ba3c21 | 283 | } |
6160f635 | 284 | |
e53e97ce DM |
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 | ||
2222c313 | 304 | printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev)); |
6160f635 | 305 | |
e53e97ce DM |
306 | err = device_register(&vdev->dev); |
307 | if (err) { | |
308 | printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", | |
2222c313 | 309 | dev_name(&vdev->dev), err); |
e53e97ce DM |
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 | ||
6160f635 | 320 | static void vio_add(struct mdesc_handle *hp, u64 node) |
e53e97ce | 321 | { |
6160f635 | 322 | (void) vio_create_one(hp, node, &root_vdev->dev); |
e53e97ce DM |
323 | } |
324 | ||
6160f635 | 325 | static int vio_md_node_match(struct device *dev, void *arg) |
e53e97ce | 326 | { |
6160f635 | 327 | struct vio_dev *vdev = to_vio_dev(dev); |
2c4f4ecb | 328 | |
6160f635 DM |
329 | if (vdev->mp == (u64) arg) |
330 | return 1; | |
e53e97ce | 331 | |
6160f635 DM |
332 | return 0; |
333 | } | |
2c4f4ecb | 334 | |
6160f635 DM |
335 | static void vio_remove(struct mdesc_handle *hp, u64 node) |
336 | { | |
337 | struct device *dev; | |
2c4f4ecb | 338 | |
6160f635 DM |
339 | dev = device_find_child(&root_vdev->dev, (void *) node, |
340 | vio_md_node_match); | |
341 | if (dev) { | |
2222c313 | 342 | printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); |
6160f635 DM |
343 | |
344 | device_unregister(dev); | |
2c4f4ecb | 345 | } |
e53e97ce DM |
346 | } |
347 | ||
6160f635 DM |
348 | static struct mdesc_notifier_client vio_device_notifier = { |
349 | .add = vio_add, | |
350 | .remove = vio_remove, | |
351 | .node_name = "virtual-device-port", | |
352 | }; | |
353 | ||
07607c54 DM |
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 | */ | |
359 | static 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 | ||
6160f635 | 379 | static struct mdesc_notifier_client vio_ds_notifier = { |
07607c54 | 380 | .add = vio_add_ds, |
6160f635 DM |
381 | .remove = vio_remove, |
382 | .node_name = "domain-services-port", | |
383 | }; | |
384 | ||
7694b024 DM |
385 | static const char *channel_devices_node = "channel-devices"; |
386 | static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; | |
387 | static const char *cfg_handle_prop = "cfg-handle"; | |
e53e97ce DM |
388 | |
389 | static int __init vio_init(void) | |
390 | { | |
43fdf274 | 391 | struct mdesc_handle *hp; |
e53e97ce DM |
392 | const char *compat; |
393 | const u64 *cfg_handle; | |
394 | int err, len; | |
43fdf274 DM |
395 | u64 root; |
396 | ||
f8be339c DM |
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 | ||
43fdf274 DM |
404 | hp = mdesc_grab(); |
405 | if (!hp) | |
406 | return 0; | |
e53e97ce | 407 | |
43fdf274 DM |
408 | root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); |
409 | if (root == MDESC_NODE_NULL) { | |
e53e97ce | 410 | printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); |
43fdf274 | 411 | mdesc_release(hp); |
e53e97ce DM |
412 | return 0; |
413 | } | |
414 | ||
415 | cdev_node = of_find_node_by_name(NULL, "channel-devices"); | |
43fdf274 | 416 | err = -ENODEV; |
e53e97ce DM |
417 | if (!cdev_node) { |
418 | printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); | |
43fdf274 | 419 | goto out_release; |
e53e97ce DM |
420 | } |
421 | ||
43fdf274 | 422 | compat = mdesc_get_property(hp, root, "compatible", &len); |
e53e97ce DM |
423 | if (!compat) { |
424 | printk(KERN_ERR "VIO: Channel devices lacks compatible " | |
425 | "property\n"); | |
43fdf274 | 426 | goto out_release; |
e53e97ce | 427 | } |
46bcea77 | 428 | if (!of_find_in_proplist(compat, channel_devices_compat, len)) { |
e53e97ce DM |
429 | printk(KERN_ERR "VIO: Channel devices node lacks (%s) " |
430 | "compat entry.\n", channel_devices_compat); | |
43fdf274 | 431 | goto out_release; |
e53e97ce DM |
432 | } |
433 | ||
43fdf274 | 434 | cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); |
e53e97ce DM |
435 | if (!cfg_handle) { |
436 | printk(KERN_ERR "VIO: Channel devices lacks %s property\n", | |
437 | cfg_handle_prop); | |
43fdf274 | 438 | goto out_release; |
e53e97ce DM |
439 | } |
440 | ||
441 | cdev_cfg_handle = *cfg_handle; | |
442 | ||
6160f635 DM |
443 | root_vdev = vio_create_one(hp, root, NULL); |
444 | err = -ENODEV; | |
445 | if (!root_vdev) { | |
02b7d834 | 446 | printk(KERN_ERR "VIO: Could not create root device.\n"); |
6160f635 DM |
447 | goto out_release; |
448 | } | |
449 | ||
920c3ed7 DM |
450 | mdesc_register_notifier(&vio_device_notifier); |
451 | mdesc_register_notifier(&vio_ds_notifier); | |
452 | ||
43fdf274 | 453 | mdesc_release(hp); |
e53e97ce | 454 | |
6160f635 | 455 | return err; |
43fdf274 DM |
456 | |
457 | out_release: | |
458 | mdesc_release(hp); | |
459 | return err; | |
e53e97ce DM |
460 | } |
461 | ||
462 | postcore_initcall(vio_init); |