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
vio_match_device(const struct vio_device_id * matches,const struct vio_dev * dev)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
vio_bus_match(struct device * dev,struct device_driver * drv)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
vio_device_probe(struct device * dev)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
vio_device_remove(struct device * dev)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
devspec_show(struct device * dev,struct device_attribute * attr,char * buf)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
type_show(struct device * dev,struct device_attribute * attr,char * buf)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
vio_register_driver(struct vio_driver * viodrv)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
vio_unregister_driver(struct vio_driver * viodrv)129 void vio_unregister_driver(struct vio_driver *viodrv)
130 {
131 driver_unregister(&viodrv->driver);
132 }
133 EXPORT_SYMBOL(vio_unregister_driver);
134
vio_dev_release(struct device * dev)135 static void vio_dev_release(struct device *dev)
136 {
137 kfree(to_vio_dev(dev));
138 }
139
140 static ssize_t
show_pciobppath_attr(struct device * dev,struct device_attribute * attr,char * buf)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
vio_fill_channel_info(struct mdesc_handle * hp,u64 mp,struct vio_dev * vdev)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
vio_create_one(struct mdesc_handle * hp,u64 mp,struct device * parent)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
vio_add(struct mdesc_handle * hp,u64 node)315 static void vio_add(struct mdesc_handle *hp, u64 node)
316 {
317 (void) vio_create_one(hp, node, &root_vdev->dev);
318 }
319
vio_md_node_match(struct device * dev,void * arg)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
vio_remove(struct mdesc_handle * hp,u64 node)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 */
vio_add_ds(struct mdesc_handle * hp,u64 node)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
vio_init(void)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