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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/irq.h> | |
14 | #include <linux/init.h> | |
15 | ||
16 | #include <asm/mdesc.h> | |
17 | #include <asm/vio.h> | |
18 | ||
19 | static inline int find_in_proplist(const char *list, const char *match, | |
20 | int len) | |
21 | { | |
22 | while (len > 0) { | |
23 | int l; | |
24 | ||
25 | if (!strcmp(list, match)) | |
26 | return 1; | |
27 | l = strlen(list) + 1; | |
28 | list += l; | |
29 | len -= l; | |
30 | } | |
31 | return 0; | |
32 | } | |
33 | ||
34 | static const struct vio_device_id *vio_match_device( | |
35 | const struct vio_device_id *matches, | |
36 | const struct vio_dev *dev) | |
37 | { | |
38 | const char *type, *compat; | |
39 | int len; | |
40 | ||
41 | type = dev->type; | |
42 | compat = dev->compat; | |
43 | len = dev->compat_len; | |
44 | ||
45 | while (matches->type[0] || matches->compat[0]) { | |
46 | int match = 1; | |
47 | if (matches->type[0]) | |
48 | match &= !strcmp(matches->type, type); | |
49 | ||
50 | if (matches->compat[0]) { | |
51 | match &= len && | |
52 | find_in_proplist(compat, matches->compat, len); | |
53 | } | |
54 | if (match) | |
55 | return matches; | |
56 | matches++; | |
57 | } | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | static int vio_bus_match(struct device *dev, struct device_driver *drv) | |
62 | { | |
63 | struct vio_dev *vio_dev = to_vio_dev(dev); | |
64 | struct vio_driver *vio_drv = to_vio_driver(drv); | |
65 | const struct vio_device_id *matches = vio_drv->id_table; | |
66 | ||
67 | if (!matches) | |
68 | return 0; | |
69 | ||
70 | return vio_match_device(matches, vio_dev) != NULL; | |
71 | } | |
72 | ||
73 | static int vio_device_probe(struct device *dev) | |
74 | { | |
75 | struct vio_dev *vdev = to_vio_dev(dev); | |
76 | struct vio_driver *drv = to_vio_driver(dev->driver); | |
77 | const struct vio_device_id *id; | |
78 | int error = -ENODEV; | |
79 | ||
80 | if (drv->probe) { | |
81 | id = vio_match_device(drv->id_table, vdev); | |
82 | if (id) | |
83 | error = drv->probe(vdev, id); | |
84 | } | |
85 | ||
86 | return error; | |
87 | } | |
88 | ||
89 | static int vio_device_remove(struct device *dev) | |
90 | { | |
91 | struct vio_dev *vdev = to_vio_dev(dev); | |
92 | struct vio_driver *drv = to_vio_driver(dev->driver); | |
93 | ||
94 | if (drv->remove) | |
95 | return drv->remove(vdev); | |
96 | ||
97 | return 1; | |
98 | } | |
99 | ||
100 | static ssize_t devspec_show(struct device *dev, | |
101 | struct device_attribute *attr, char *buf) | |
102 | { | |
103 | struct vio_dev *vdev = to_vio_dev(dev); | |
104 | const char *str = "none"; | |
105 | ||
106 | if (!strcmp(vdev->type, "vnet-port")) | |
107 | str = "vnet"; | |
108 | else if (!strcmp(vdev->type, "vdc-port")) | |
109 | str = "vdisk"; | |
110 | ||
111 | return sprintf(buf, "%s\n", str); | |
112 | } | |
113 | ||
114 | static ssize_t type_show(struct device *dev, | |
115 | struct device_attribute *attr, char *buf) | |
116 | { | |
117 | struct vio_dev *vdev = to_vio_dev(dev); | |
118 | return sprintf(buf, "%s\n", vdev->type); | |
119 | } | |
120 | ||
121 | static struct device_attribute vio_dev_attrs[] = { | |
122 | __ATTR_RO(devspec), | |
123 | __ATTR_RO(type), | |
124 | __ATTR_NULL | |
125 | }; | |
126 | ||
127 | static struct bus_type vio_bus_type = { | |
128 | .name = "vio", | |
129 | .dev_attrs = vio_dev_attrs, | |
130 | .match = vio_bus_match, | |
131 | .probe = vio_device_probe, | |
132 | .remove = vio_device_remove, | |
133 | }; | |
134 | ||
135 | int vio_register_driver(struct vio_driver *viodrv) | |
136 | { | |
137 | viodrv->driver.bus = &vio_bus_type; | |
138 | ||
139 | return driver_register(&viodrv->driver); | |
140 | } | |
141 | EXPORT_SYMBOL(vio_register_driver); | |
142 | ||
143 | void vio_unregister_driver(struct vio_driver *viodrv) | |
144 | { | |
145 | driver_unregister(&viodrv->driver); | |
146 | } | |
147 | EXPORT_SYMBOL(vio_unregister_driver); | |
148 | ||
149 | static void __devinit vio_dev_release(struct device *dev) | |
150 | { | |
151 | kfree(to_vio_dev(dev)); | |
152 | } | |
153 | ||
154 | static ssize_t | |
155 | show_pciobppath_attr(struct device *dev, struct device_attribute *attr, | |
156 | char *buf) | |
157 | { | |
158 | struct vio_dev *vdev; | |
159 | struct device_node *dp; | |
160 | ||
161 | vdev = to_vio_dev(dev); | |
162 | dp = vdev->dp; | |
163 | ||
164 | return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); | |
165 | } | |
166 | ||
167 | static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, | |
168 | show_pciobppath_attr, NULL); | |
169 | ||
170 | struct device_node *cdev_node; | |
171 | ||
172 | static struct vio_dev *root_vdev; | |
173 | static u64 cdev_cfg_handle; | |
174 | ||
175 | static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, | |
176 | struct vio_dev *vdev) | |
177 | { | |
178 | u64 a; | |
179 | ||
180 | mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { | |
181 | const u64 *chan_id; | |
182 | const u64 *irq; | |
183 | u64 target; | |
184 | ||
185 | target = mdesc_arc_target(hp, a); | |
186 | ||
187 | irq = mdesc_get_property(hp, target, "tx-ino", NULL); | |
188 | if (irq) | |
189 | vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); | |
190 | ||
191 | irq = mdesc_get_property(hp, target, "rx-ino", NULL); | |
192 | if (irq) | |
193 | vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); | |
194 | ||
195 | chan_id = mdesc_get_property(hp, target, "id", NULL); | |
196 | if (chan_id) | |
197 | vdev->channel_id = *chan_id; | |
198 | } | |
199 | } | |
200 | ||
201 | static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, | |
202 | struct device *parent) | |
203 | { | |
204 | const char *type, *compat, *bus_id_name; | |
205 | struct device_node *dp; | |
206 | struct vio_dev *vdev; | |
207 | int err, tlen, clen; | |
208 | const u64 *id, *cfg_handle; | |
209 | u64 a; | |
210 | ||
211 | type = mdesc_get_property(hp, mp, "device-type", &tlen); | |
212 | if (!type) { | |
213 | type = mdesc_get_property(hp, mp, "name", &tlen); | |
214 | if (!type) { | |
215 | type = mdesc_node_name(hp, mp); | |
216 | tlen = strlen(type) + 1; | |
217 | } | |
218 | } | |
219 | if (tlen > VIO_MAX_TYPE_LEN) { | |
220 | printk(KERN_ERR "VIO: Type string [%s] is too long.\n", | |
221 | type); | |
222 | return NULL; | |
223 | } | |
224 | ||
225 | id = mdesc_get_property(hp, mp, "id", NULL); | |
226 | ||
227 | cfg_handle = NULL; | |
228 | mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) { | |
229 | u64 target; | |
230 | ||
231 | target = mdesc_arc_target(hp, a); | |
232 | cfg_handle = mdesc_get_property(hp, target, | |
233 | "cfg-handle", NULL); | |
234 | if (cfg_handle) | |
235 | break; | |
236 | } | |
237 | ||
238 | bus_id_name = type; | |
239 | if (!strcmp(type, "domain-services-port")) | |
240 | bus_id_name = "ds"; | |
241 | ||
242 | if (strlen(bus_id_name) >= KOBJ_NAME_LEN - 4) { | |
243 | printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n", | |
244 | bus_id_name); | |
245 | return NULL; | |
246 | } | |
247 | ||
248 | compat = mdesc_get_property(hp, mp, "device-type", &clen); | |
249 | if (!compat) { | |
250 | clen = 0; | |
251 | } else if (clen > VIO_MAX_COMPAT_LEN) { | |
252 | printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", | |
253 | clen, type); | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
258 | if (!vdev) { | |
259 | printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); | |
260 | return NULL; | |
261 | } | |
262 | ||
263 | vdev->mp = mp; | |
264 | memcpy(vdev->type, type, tlen); | |
265 | if (compat) | |
266 | memcpy(vdev->compat, compat, clen); | |
267 | else | |
268 | memset(vdev->compat, 0, sizeof(vdev->compat)); | |
269 | vdev->compat_len = clen; | |
270 | ||
271 | vdev->channel_id = ~0UL; | |
272 | vdev->tx_irq = ~0; | |
273 | vdev->rx_irq = ~0; | |
274 | ||
275 | vio_fill_channel_info(hp, mp, vdev); | |
276 | ||
277 | if (!id) { | |
278 | snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s", | |
279 | bus_id_name); | |
280 | vdev->dev_no = ~(u64)0; | |
281 | } else if (!cfg_handle) { | |
282 | snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu", | |
283 | bus_id_name, *id); | |
284 | vdev->dev_no = *id; | |
285 | } else { | |
286 | snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu-%lu", | |
287 | bus_id_name, *cfg_handle, *id); | |
288 | vdev->dev_no = *cfg_handle; | |
289 | } | |
290 | ||
291 | vdev->dev.parent = parent; | |
292 | vdev->dev.bus = &vio_bus_type; | |
293 | vdev->dev.release = vio_dev_release; | |
294 | ||
295 | if (parent == NULL) { | |
296 | dp = cdev_node; | |
297 | } else if (to_vio_dev(parent) == root_vdev) { | |
298 | dp = of_get_next_child(cdev_node, NULL); | |
299 | while (dp) { | |
300 | if (!strcmp(dp->type, type)) | |
301 | break; | |
302 | ||
303 | dp = of_get_next_child(cdev_node, dp); | |
304 | } | |
305 | } else { | |
306 | dp = to_vio_dev(parent)->dp; | |
307 | } | |
308 | vdev->dp = dp; | |
309 | ||
310 | printk(KERN_ERR "VIO: Adding device %s\n", vdev->dev.bus_id); | |
311 | ||
312 | err = device_register(&vdev->dev); | |
313 | if (err) { | |
314 | printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", | |
315 | vdev->dev.bus_id, err); | |
316 | kfree(vdev); | |
317 | return NULL; | |
318 | } | |
319 | if (vdev->dp) | |
320 | err = sysfs_create_file(&vdev->dev.kobj, | |
321 | &dev_attr_obppath.attr); | |
322 | ||
323 | return vdev; | |
324 | } | |
325 | ||
326 | static void vio_add(struct mdesc_handle *hp, u64 node) | |
327 | { | |
328 | (void) vio_create_one(hp, node, &root_vdev->dev); | |
329 | } | |
330 | ||
331 | static int vio_md_node_match(struct device *dev, void *arg) | |
332 | { | |
333 | struct vio_dev *vdev = to_vio_dev(dev); | |
334 | ||
335 | if (vdev->mp == (u64) arg) | |
336 | return 1; | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | static void vio_remove(struct mdesc_handle *hp, u64 node) | |
342 | { | |
343 | struct device *dev; | |
344 | ||
345 | dev = device_find_child(&root_vdev->dev, (void *) node, | |
346 | vio_md_node_match); | |
347 | if (dev) { | |
348 | printk(KERN_INFO "VIO: Removing device %s\n", dev->bus_id); | |
349 | ||
350 | device_unregister(dev); | |
351 | } | |
352 | } | |
353 | ||
354 | static struct mdesc_notifier_client vio_device_notifier = { | |
355 | .add = vio_add, | |
356 | .remove = vio_remove, | |
357 | .node_name = "virtual-device-port", | |
358 | }; | |
359 | ||
360 | static struct mdesc_notifier_client vio_ds_notifier = { | |
361 | .add = vio_add, | |
362 | .remove = vio_remove, | |
363 | .node_name = "domain-services-port", | |
364 | }; | |
365 | ||
366 | const char *channel_devices_node = "channel-devices"; | |
367 | const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; | |
368 | const char *cfg_handle_prop = "cfg-handle"; | |
369 | ||
370 | static int __init vio_init(void) | |
371 | { | |
372 | struct mdesc_handle *hp; | |
373 | const char *compat; | |
374 | const u64 *cfg_handle; | |
375 | int err, len; | |
376 | u64 root; | |
377 | ||
378 | err = bus_register(&vio_bus_type); | |
379 | if (err) { | |
380 | printk(KERN_ERR "VIO: Could not register bus type err=%d\n", | |
381 | err); | |
382 | return err; | |
383 | } | |
384 | ||
385 | hp = mdesc_grab(); | |
386 | if (!hp) | |
387 | return 0; | |
388 | ||
389 | root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); | |
390 | if (root == MDESC_NODE_NULL) { | |
391 | printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); | |
392 | mdesc_release(hp); | |
393 | return 0; | |
394 | } | |
395 | ||
396 | cdev_node = of_find_node_by_name(NULL, "channel-devices"); | |
397 | err = -ENODEV; | |
398 | if (!cdev_node) { | |
399 | printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); | |
400 | goto out_release; | |
401 | } | |
402 | ||
403 | compat = mdesc_get_property(hp, root, "compatible", &len); | |
404 | if (!compat) { | |
405 | printk(KERN_ERR "VIO: Channel devices lacks compatible " | |
406 | "property\n"); | |
407 | goto out_release; | |
408 | } | |
409 | if (!find_in_proplist(compat, channel_devices_compat, len)) { | |
410 | printk(KERN_ERR "VIO: Channel devices node lacks (%s) " | |
411 | "compat entry.\n", channel_devices_compat); | |
412 | goto out_release; | |
413 | } | |
414 | ||
415 | cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); | |
416 | if (!cfg_handle) { | |
417 | printk(KERN_ERR "VIO: Channel devices lacks %s property\n", | |
418 | cfg_handle_prop); | |
419 | goto out_release; | |
420 | } | |
421 | ||
422 | cdev_cfg_handle = *cfg_handle; | |
423 | ||
424 | root_vdev = vio_create_one(hp, root, NULL); | |
425 | err = -ENODEV; | |
426 | if (!root_vdev) { | |
427 | printk(KERN_ERR "VIO: Coult not create root device.\n"); | |
428 | goto out_release; | |
429 | } | |
430 | ||
431 | mdesc_register_notifier(&vio_device_notifier); | |
432 | mdesc_register_notifier(&vio_ds_notifier); | |
433 | ||
434 | mdesc_release(hp); | |
435 | ||
436 | return err; | |
437 | ||
438 | out_release: | |
439 | mdesc_release(hp); | |
440 | return err; | |
441 | } | |
442 | ||
443 | postcore_initcall(vio_init); |