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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 | |
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; |
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 | |
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 | |
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 | |
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 | |
107 | static struct device_attribute vio_dev_attrs[] = { |
108 | __ATTR_RO(devspec), |
109 | __ATTR_RO(type), |
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 | |
135 | static void vio_dev_release(struct device *dev) |
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 | |
156 | static struct device_node *cdev_node; |
157 | |
158 | static struct vio_dev *root_vdev; |
159 | static u64 cdev_cfg_handle; |
160 | |
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, |
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 | |
315 | static void vio_add(struct mdesc_handle *hp, u64 node) |
316 | { |
317 | (void) vio_create_one(hp, node, &root_vdev->dev); |
318 | } |
319 | |
320 | static 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 | |
330 | static 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 | |
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 | |
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 | |
374 | static struct mdesc_notifier_client vio_ds_notifier = { |
375 | .add = vio_add_ds, |
376 | .remove = vio_remove, |
377 | .node_name = "domain-services-port", |
378 | }; |
379 | |
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"; |
383 | |
384 | static 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 | |
452 | out_release: |
453 | mdesc_release(hp); |
454 | return err; |
455 | } |
456 | |
457 | postcore_initcall(vio_init); |
458 |
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