Commit | Line | Data |
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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 DM |
14 | #include <linux/irq.h> |
15 | #include <linux/init.h> | |
16 | ||
17 | #include <asm/mdesc.h> | |
18 | #include <asm/vio.h> | |
19 | ||
e53e97ce DM |
20 | static 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; | |
83292e0a DM |
33 | if (matches->type[0]) |
34 | match &= !strcmp(matches->type, type); | |
35 | ||
e53e97ce | 36 | if (matches->compat[0]) { |
83292e0a | 37 | match &= len && |
46bcea77 | 38 | of_find_in_proplist(compat, matches->compat, len); |
e53e97ce DM |
39 | } |
40 | if (match) | |
41 | return matches; | |
42 | matches++; | |
43 | } | |
44 | return NULL; | |
45 | } | |
46 | ||
47 | static 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 | ||
59 | static 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 | ||
75 | static 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 | ||
86 | static 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 | ||
48db7b7c | 92 | if (!strcmp(vdev->type, "vnet-port")) |
2c4f4ecb | 93 | str = "vnet"; |
48db7b7c | 94 | else if (!strcmp(vdev->type, "vdc-port")) |
2c4f4ecb | 95 | str = "vdisk"; |
e53e97ce DM |
96 | |
97 | return sprintf(buf, "%s\n", str); | |
98 | } | |
99 | ||
2c4f4ecb DM |
100 | static 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 | ||
e53e97ce DM |
107 | static struct device_attribute vio_dev_attrs[] = { |
108 | __ATTR_RO(devspec), | |
2c4f4ecb | 109 | __ATTR_RO(type), |
e53e97ce DM |
110 | __ATTR_NULL |
111 | }; | |
112 | ||
113 | static 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 | ||
121 | int vio_register_driver(struct vio_driver *viodrv) | |
122 | { | |
123 | viodrv->driver.bus = &vio_bus_type; | |
124 | ||
125 | return driver_register(&viodrv->driver); | |
126 | } | |
127 | EXPORT_SYMBOL(vio_register_driver); | |
128 | ||
129 | void vio_unregister_driver(struct vio_driver *viodrv) | |
130 | { | |
131 | driver_unregister(&viodrv->driver); | |
132 | } | |
133 | EXPORT_SYMBOL(vio_unregister_driver); | |
134 | ||
a1f35ba3 | 135 | static void vio_dev_release(struct device *dev) |
e53e97ce DM |
136 | { |
137 | kfree(to_vio_dev(dev)); | |
138 | } | |
139 | ||
140 | static ssize_t | |
141 | show_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 | ||
153 | static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, | |
154 | show_pciobppath_attr, NULL); | |
155 | ||
7694b024 | 156 | static struct device_node *cdev_node; |
e53e97ce DM |
157 | |
158 | static struct vio_dev *root_vdev; | |
159 | static u64 cdev_cfg_handle; | |
160 | ||
43fdf274 DM |
161 | static 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 | ||
187 | static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, | |
e53e97ce DM |
188 | struct device *parent) |
189 | { | |
6160f635 | 190 | const char *type, *compat, *bus_id_name; |
e53e97ce DM |
191 | struct device_node *dp; |
192 | struct vio_dev *vdev; | |
83292e0a | 193 | int err, tlen, clen; |
58fb6666 DM |
194 | const u64 *id, *cfg_handle; |
195 | u64 a; | |
e53e97ce | 196 | |
83292e0a | 197 | type = mdesc_get_property(hp, mp, "device-type", &tlen); |
2c4f4ecb | 198 | if (!type) { |
83292e0a DM |
199 | type = mdesc_get_property(hp, mp, "name", &tlen); |
200 | if (!type) { | |
43fdf274 | 201 | type = mdesc_node_name(hp, mp); |
83292e0a DM |
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; | |
2c4f4ecb | 209 | } |
83292e0a | 210 | |
58fb6666 | 211 | id = mdesc_get_property(hp, mp, "id", NULL); |
91ba3c21 | 212 | |
58fb6666 DM |
213 | cfg_handle = NULL; |
214 | mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { | |
215 | u64 target; | |
91ba3c21 | 216 | |
58fb6666 DM |
217 | target = mdesc_arc_target(hp, a); |
218 | cfg_handle = mdesc_get_property(hp, target, | |
91ba3c21 | 219 | "cfg-handle", NULL); |
58fb6666 DM |
220 | if (cfg_handle) |
221 | break; | |
222 | } | |
91ba3c21 | 223 | |
6160f635 DM |
224 | bus_id_name = type; |
225 | if (!strcmp(type, "domain-services-port")) | |
226 | bus_id_name = "ds"; | |
227 | ||
08f42877 KS |
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) { | |
6160f635 DM |
234 | printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", |
235 | bus_id_name); | |
236 | return NULL; | |
237 | } | |
238 | ||
43fdf274 | 239 | compat = mdesc_get_property(hp, mp, "device-type", &clen); |
83292e0a DM |
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 | } | |
e53e97ce DM |
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; | |
83292e0a DM |
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)); | |
e53e97ce DM |
260 | vdev->compat_len = clen; |
261 | ||
43fdf274 DM |
262 | vdev->channel_id = ~0UL; |
263 | vdev->tx_irq = ~0; | |
264 | vdev->rx_irq = ~0; | |
e53e97ce | 265 | |
43fdf274 | 266 | vio_fill_channel_info(hp, mp, vdev); |
e53e97ce | 267 | |
91ba3c21 | 268 | if (!id) { |
2222c313 | 269 | dev_set_name(&vdev->dev, "%s", bus_id_name); |
91ba3c21 | 270 | vdev->dev_no = ~(u64)0; |
58fb6666 | 271 | } else if (!cfg_handle) { |
90181136 | 272 | dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id); |
91ba3c21 | 273 | vdev->dev_no = *id; |
58fb6666 | 274 | } else { |
90181136 | 275 | dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name, |
2222c313 | 276 | *cfg_handle, *id); |
58fb6666 | 277 | vdev->dev_no = *cfg_handle; |
91ba3c21 | 278 | } |
6160f635 | 279 | |
e53e97ce DM |
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 | ||
2222c313 | 299 | printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev)); |
6160f635 | 300 | |
e53e97ce DM |
301 | err = device_register(&vdev->dev); |
302 | if (err) { | |
303 | printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", | |
2222c313 | 304 | dev_name(&vdev->dev), err); |
e53e97ce DM |
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 | ||
6160f635 | 315 | static void vio_add(struct mdesc_handle *hp, u64 node) |
e53e97ce | 316 | { |
6160f635 | 317 | (void) vio_create_one(hp, node, &root_vdev->dev); |
e53e97ce DM |
318 | } |
319 | ||
6160f635 | 320 | static int vio_md_node_match(struct device *dev, void *arg) |
e53e97ce | 321 | { |
6160f635 | 322 | struct vio_dev *vdev = to_vio_dev(dev); |
2c4f4ecb | 323 | |
6160f635 DM |
324 | if (vdev->mp == (u64) arg) |
325 | return 1; | |
e53e97ce | 326 | |
6160f635 DM |
327 | return 0; |
328 | } | |
2c4f4ecb | 329 | |
6160f635 DM |
330 | static void vio_remove(struct mdesc_handle *hp, u64 node) |
331 | { | |
332 | struct device *dev; | |
2c4f4ecb | 333 | |
6160f635 DM |
334 | dev = device_find_child(&root_vdev->dev, (void *) node, |
335 | vio_md_node_match); | |
336 | if (dev) { | |
2222c313 | 337 | printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev)); |
6160f635 DM |
338 | |
339 | device_unregister(dev); | |
2c4f4ecb | 340 | } |
e53e97ce DM |
341 | } |
342 | ||
6160f635 DM |
343 | static struct mdesc_notifier_client vio_device_notifier = { |
344 | .add = vio_add, | |
345 | .remove = vio_remove, | |
346 | .node_name = "virtual-device-port", | |
347 | }; | |
348 | ||
07607c54 DM |
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 | */ | |
354 | static 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 | ||
6160f635 | 374 | static struct mdesc_notifier_client vio_ds_notifier = { |
07607c54 | 375 | .add = vio_add_ds, |
6160f635 DM |
376 | .remove = vio_remove, |
377 | .node_name = "domain-services-port", | |
378 | }; | |
379 | ||
7694b024 DM |
380 | static const char *channel_devices_node = "channel-devices"; |
381 | static const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; | |
382 | static const char *cfg_handle_prop = "cfg-handle"; | |
e53e97ce DM |
383 | |
384 | static int __init vio_init(void) | |
385 | { | |
43fdf274 | 386 | struct mdesc_handle *hp; |
e53e97ce DM |
387 | const char *compat; |
388 | const u64 *cfg_handle; | |
389 | int err, len; | |
43fdf274 DM |
390 | u64 root; |
391 | ||
f8be339c DM |
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 | ||
43fdf274 DM |
399 | hp = mdesc_grab(); |
400 | if (!hp) | |
401 | return 0; | |
e53e97ce | 402 | |
43fdf274 DM |
403 | root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); |
404 | if (root == MDESC_NODE_NULL) { | |
e53e97ce | 405 | printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); |
43fdf274 | 406 | mdesc_release(hp); |
e53e97ce DM |
407 | return 0; |
408 | } | |
409 | ||
410 | cdev_node = of_find_node_by_name(NULL, "channel-devices"); | |
43fdf274 | 411 | err = -ENODEV; |
e53e97ce DM |
412 | if (!cdev_node) { |
413 | printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); | |
43fdf274 | 414 | goto out_release; |
e53e97ce DM |
415 | } |
416 | ||
43fdf274 | 417 | compat = mdesc_get_property(hp, root, "compatible", &len); |
e53e97ce DM |
418 | if (!compat) { |
419 | printk(KERN_ERR "VIO: Channel devices lacks compatible " | |
420 | "property\n"); | |
43fdf274 | 421 | goto out_release; |
e53e97ce | 422 | } |
46bcea77 | 423 | if (!of_find_in_proplist(compat, channel_devices_compat, len)) { |
e53e97ce DM |
424 | printk(KERN_ERR "VIO: Channel devices node lacks (%s) " |
425 | "compat entry.\n", channel_devices_compat); | |
43fdf274 | 426 | goto out_release; |
e53e97ce DM |
427 | } |
428 | ||
43fdf274 | 429 | cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); |
e53e97ce DM |
430 | if (!cfg_handle) { |
431 | printk(KERN_ERR "VIO: Channel devices lacks %s property\n", | |
432 | cfg_handle_prop); | |
43fdf274 | 433 | goto out_release; |
e53e97ce DM |
434 | } |
435 | ||
436 | cdev_cfg_handle = *cfg_handle; | |
437 | ||
6160f635 DM |
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 | ||
920c3ed7 DM |
445 | mdesc_register_notifier(&vio_device_notifier); |
446 | mdesc_register_notifier(&vio_ds_notifier); | |
447 | ||
43fdf274 | 448 | mdesc_release(hp); |
e53e97ce | 449 | |
6160f635 | 450 | return err; |
43fdf274 DM |
451 | |
452 | out_release: | |
453 | mdesc_release(hp); | |
454 | return err; | |
e53e97ce DM |
455 | } |
456 | ||
457 | postcore_initcall(vio_init); |