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1// SPDX-License-Identifier: GPL-2.0
2/* vio.c: Virtual I/O channel devices probing infrastructure.
3 *
4 * Copyright (c) 2003-2005 IBM Corp.
5 * Dave Engebretsen [email protected]
6 * Santiago Leon [email protected]
7 * Hollis Blanchard <[email protected]>
8 * Stephen Rothwell
9 *
10 * Adapted to sparc64 by David S. Miller [email protected]
11 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/string.h>
16#include <linux/sysfs.h>
17#include <linux/irq.h>
18#include <linux/export.h>
19#include <linux/init.h>
20
21#include <asm/mdesc.h>
22#include <asm/vio.h>
23
24static const struct vio_device_id *vio_match_device(
25 const struct vio_device_id *matches,
26 const struct vio_dev *dev)
27{
28 const char *type, *compat;
29 int len;
30
31 type = dev->type;
32 compat = dev->compat;
33 len = dev->compat_len;
34
35 while (matches->type[0] || matches->compat[0]) {
36 int match = 1;
37 if (matches->type[0])
38 match &= !strcmp(matches->type, type);
39
40 if (matches->compat[0]) {
41 match &= len &&
42 of_find_in_proplist(compat, matches->compat, len);
43 }
44 if (match)
45 return matches;
46 matches++;
47 }
48 return NULL;
49}
50
51static int vio_hotplug(const struct device *dev, struct kobj_uevent_env *env)
52{
53 const struct vio_dev *vio_dev = to_vio_dev(dev);
54
55 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
56 return 0;
57}
58
59static int vio_bus_match(struct device *dev, const struct device_driver *drv)
60{
61 struct vio_dev *vio_dev = to_vio_dev(dev);
62 const struct vio_driver *vio_drv = to_vio_driver(drv);
63 const struct vio_device_id *matches = vio_drv->id_table;
64
65 if (!matches)
66 return 0;
67
68 return vio_match_device(matches, vio_dev) != NULL;
69}
70
71static int vio_device_probe(struct device *dev)
72{
73 struct vio_dev *vdev = to_vio_dev(dev);
74 struct vio_driver *drv = to_vio_driver(dev->driver);
75 const struct vio_device_id *id;
76
77 if (!drv->probe)
78 return -ENODEV;
79
80 id = vio_match_device(drv->id_table, vdev);
81 if (!id)
82 return -ENODEV;
83
84 /* alloc irqs (unless the driver specified not to) */
85 if (!drv->no_irq) {
86 if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
87 vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
88 vdev->tx_ino);
89
90 if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
91 vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
92 vdev->rx_ino);
93 }
94
95 return drv->probe(vdev, id);
96}
97
98static void vio_device_remove(struct device *dev)
99{
100 struct vio_dev *vdev = to_vio_dev(dev);
101 struct vio_driver *drv = to_vio_driver(dev->driver);
102
103 if (drv->remove) {
104 /*
105 * Ideally, we would remove/deallocate tx/rx virqs
106 * here - however, there are currently no support
107 * routines to do so at the moment. TBD
108 */
109
110 drv->remove(vdev);
111 }
112}
113
114static ssize_t devspec_show(struct device *dev,
115 struct device_attribute *attr, char *buf)
116{
117 struct vio_dev *vdev = to_vio_dev(dev);
118 const char *str = "none";
119
120 if (!strcmp(vdev->type, "vnet-port"))
121 str = "vnet";
122 else if (!strcmp(vdev->type, "vdc-port"))
123 str = "vdisk";
124
125 return sysfs_emit(buf, "%s\n", str);
126}
127static DEVICE_ATTR_RO(devspec);
128
129static ssize_t type_show(struct device *dev,
130 struct device_attribute *attr, char *buf)
131{
132 struct vio_dev *vdev = to_vio_dev(dev);
133 return sysfs_emit(buf, "%s\n", vdev->type);
134}
135static DEVICE_ATTR_RO(type);
136
137static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
138 char *buf)
139{
140 const struct vio_dev *vdev = to_vio_dev(dev);
141
142 return sysfs_emit(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
143}
144static DEVICE_ATTR_RO(modalias);
145
146static struct attribute *vio_dev_attrs[] = {
147 &dev_attr_devspec.attr,
148 &dev_attr_type.attr,
149 &dev_attr_modalias.attr,
150 NULL,
151 };
152ATTRIBUTE_GROUPS(vio_dev);
153
154static const struct bus_type vio_bus_type = {
155 .name = "vio",
156 .dev_groups = vio_dev_groups,
157 .uevent = vio_hotplug,
158 .match = vio_bus_match,
159 .probe = vio_device_probe,
160 .remove = vio_device_remove,
161};
162
163int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
164 const char *mod_name)
165{
166 viodrv->driver.bus = &vio_bus_type;
167 viodrv->driver.name = viodrv->name;
168 viodrv->driver.owner = owner;
169 viodrv->driver.mod_name = mod_name;
170
171 return driver_register(&viodrv->driver);
172}
173EXPORT_SYMBOL(__vio_register_driver);
174
175void vio_unregister_driver(struct vio_driver *viodrv)
176{
177 driver_unregister(&viodrv->driver);
178}
179EXPORT_SYMBOL(vio_unregister_driver);
180
181static void vio_dev_release(struct device *dev)
182{
183 kfree(to_vio_dev(dev));
184}
185
186static ssize_t
187show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
188 char *buf)
189{
190 struct vio_dev *vdev;
191 struct device_node *dp;
192
193 vdev = to_vio_dev(dev);
194 dp = vdev->dp;
195
196 return sysfs_emit(buf, "%pOF\n", dp);
197}
198
199static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
200 show_pciobppath_attr, NULL);
201
202static struct device_node *cdev_node;
203
204static struct vio_dev *root_vdev;
205static u64 cdev_cfg_handle;
206
207static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node)
208{
209 const u64 *cfg_handle = NULL;
210 u64 a;
211
212 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
213 u64 target;
214
215 target = mdesc_arc_target(hp, a);
216 cfg_handle = mdesc_get_property(hp, target,
217 "cfg-handle", NULL);
218 if (cfg_handle)
219 break;
220 }
221
222 return cfg_handle;
223}
224
225/**
226 * vio_vdev_node() - Find VDEV node in MD
227 * @hp: Handle to the MD
228 * @vdev: Pointer to VDEV
229 *
230 * Find the node in the current MD which matches the given vio_dev. This
231 * must be done dynamically since the node value can change if the MD
232 * is updated.
233 *
234 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine
235 *
236 * Return: The VDEV node in MDESC
237 */
238u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)
239{
240 u64 node;
241
242 if (vdev == NULL)
243 return MDESC_NODE_NULL;
244
245 node = mdesc_get_node(hp, (const char *)vdev->node_name,
246 &vdev->md_node_info);
247
248 return node;
249}
250EXPORT_SYMBOL(vio_vdev_node);
251
252static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
253 struct vio_dev *vdev)
254{
255 u64 a;
256
257 vdev->tx_ino = ~0UL;
258 vdev->rx_ino = ~0UL;
259 vdev->channel_id = ~0UL;
260 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
261 const u64 *chan_id;
262 const u64 *irq;
263 u64 target;
264
265 target = mdesc_arc_target(hp, a);
266
267 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
268 if (irq)
269 vdev->tx_ino = *irq;
270
271 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
272 if (irq)
273 vdev->rx_ino = *irq;
274
275 chan_id = mdesc_get_property(hp, target, "id", NULL);
276 if (chan_id)
277 vdev->channel_id = *chan_id;
278 }
279
280 vdev->cdev_handle = cdev_cfg_handle;
281}
282
283int vio_set_intr(unsigned long dev_ino, int state)
284{
285 int err;
286
287 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
288 return err;
289}
290EXPORT_SYMBOL(vio_set_intr);
291
292static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
293 const char *node_name,
294 struct device *parent)
295{
296 const char *type, *compat;
297 struct device_node *dp;
298 struct vio_dev *vdev;
299 int err, tlen, clen;
300 const u64 *id, *cfg_handle;
301
302 type = mdesc_get_property(hp, mp, "device-type", &tlen);
303 if (!type) {
304 type = mdesc_get_property(hp, mp, "name", &tlen);
305 if (!type) {
306 type = mdesc_node_name(hp, mp);
307 tlen = strlen(type) + 1;
308 }
309 }
310 if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) {
311 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
312 type);
313 return NULL;
314 }
315
316 id = mdesc_get_property(hp, mp, "id", NULL);
317
318 cfg_handle = vio_cfg_handle(hp, mp);
319
320 compat = mdesc_get_property(hp, mp, "device-type", &clen);
321 if (!compat) {
322 clen = 0;
323 } else if (clen > VIO_MAX_COMPAT_LEN) {
324 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
325 clen, type);
326 return NULL;
327 }
328
329 vdev = kzalloc_obj(*vdev);
330 if (!vdev) {
331 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
332 return NULL;
333 }
334
335 vdev->mp = mp;
336 memcpy(vdev->type, type, tlen);
337 if (compat)
338 memcpy(vdev->compat, compat, clen);
339 else
340 memset(vdev->compat, 0, sizeof(vdev->compat));
341 vdev->compat_len = clen;
342
343 vdev->port_id = ~0UL;
344 vdev->tx_irq = 0;
345 vdev->rx_irq = 0;
346
347 vio_fill_channel_info(hp, mp, vdev);
348
349 if (!id) {
350 dev_set_name(&vdev->dev, "%s", type);
351 vdev->dev_no = ~(u64)0;
352 } else if (!cfg_handle) {
353 dev_set_name(&vdev->dev, "%s-%llu", type, *id);
354 vdev->dev_no = *id;
355 } else {
356 dev_set_name(&vdev->dev, "%s-%llu-%llu", type,
357 *cfg_handle, *id);
358 vdev->dev_no = *cfg_handle;
359 vdev->port_id = *id;
360 }
361
362 vdev->dev.parent = parent;
363 vdev->dev.bus = &vio_bus_type;
364 vdev->dev.release = vio_dev_release;
365
366 if (parent == NULL) {
367 dp = cdev_node;
368 } else if (to_vio_dev(parent) == root_vdev) {
369 for_each_child_of_node(cdev_node, dp) {
370 if (of_node_is_type(dp, type))
371 break;
372 }
373 } else {
374 dp = to_vio_dev(parent)->dp;
375 }
376 vdev->dp = dp;
377
378 /*
379 * node_name is NULL for the parent/channel-devices node and
380 * the parent doesn't require the MD node info.
381 */
382 if (node_name != NULL) {
383 strscpy(vdev->node_name, node_name);
384
385 err = mdesc_get_node_info(hp, mp, node_name,
386 &vdev->md_node_info);
387 if (err) {
388 pr_err("VIO: Could not get MD node info %s, err=%d\n",
389 dev_name(&vdev->dev), err);
390 kfree(vdev);
391 return NULL;
392 }
393 }
394
395 pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
396 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
397
398 err = device_register(&vdev->dev);
399 if (err) {
400 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
401 dev_name(&vdev->dev), err);
402 put_device(&vdev->dev);
403 return NULL;
404 }
405 if (vdev->dp)
406 err = sysfs_create_file(&vdev->dev.kobj,
407 &dev_attr_obppath.attr);
408
409 return vdev;
410}
411
412static void vio_add(struct mdesc_handle *hp, u64 node,
413 const char *node_name)
414{
415 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
416}
417
418struct vio_remove_node_data {
419 struct mdesc_handle *hp;
420 u64 node;
421};
422
423static int vio_md_node_match(struct device *dev, const void *arg)
424{
425 struct vio_dev *vdev = to_vio_dev(dev);
426 const struct vio_remove_node_data *node_data;
427 u64 node;
428
429 node_data = (const struct vio_remove_node_data *)arg;
430
431 node = vio_vdev_node(node_data->hp, vdev);
432
433 if (node == node_data->node)
434 return 1;
435 else
436 return 0;
437}
438
439static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
440{
441 struct vio_remove_node_data node_data;
442 struct device *dev;
443
444 node_data.hp = hp;
445 node_data.node = node;
446
447 dev = device_find_child(&root_vdev->dev, (void *)&node_data,
448 vio_md_node_match);
449 if (dev) {
450 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
451
452 device_unregister(dev);
453 put_device(dev);
454 } else {
455 pr_err("VIO: %s node not found in MDESC\n", node_name);
456 }
457}
458
459static struct mdesc_notifier_client vio_device_notifier = {
460 .add = vio_add,
461 .remove = vio_remove,
462 .node_name = "virtual-device-port",
463};
464
465/* We are only interested in domain service ports under the
466 * "domain-services" node. On control nodes there is another port
467 * under "openboot" that we should not mess with as aparently that is
468 * reserved exclusively for OBP use.
469 */
470static void vio_add_ds(struct mdesc_handle *hp, u64 node,
471 const char *node_name)
472{
473 int found;
474 u64 a;
475
476 found = 0;
477 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
478 u64 target = mdesc_arc_target(hp, a);
479 const char *name = mdesc_node_name(hp, target);
480
481 if (!strcmp(name, "domain-services")) {
482 found = 1;
483 break;
484 }
485 }
486
487 if (found)
488 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
489}
490
491static struct mdesc_notifier_client vio_ds_notifier = {
492 .add = vio_add_ds,
493 .remove = vio_remove,
494 .node_name = "domain-services-port",
495};
496
497static const char *channel_devices_node = "channel-devices";
498static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
499static const char *cfg_handle_prop = "cfg-handle";
500
501static int __init vio_init(void)
502{
503 struct mdesc_handle *hp;
504 const char *compat;
505 const u64 *cfg_handle;
506 int err, len;
507 u64 root;
508
509 err = bus_register(&vio_bus_type);
510 if (err) {
511 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
512 err);
513 return err;
514 }
515
516 hp = mdesc_grab();
517 if (!hp)
518 return 0;
519
520 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
521 if (root == MDESC_NODE_NULL) {
522 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
523 mdesc_release(hp);
524 return 0;
525 }
526
527 cdev_node = of_find_node_by_name(NULL, "channel-devices");
528 err = -ENODEV;
529 if (!cdev_node) {
530 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
531 goto out_release;
532 }
533
534 compat = mdesc_get_property(hp, root, "compatible", &len);
535 if (!compat) {
536 printk(KERN_ERR "VIO: Channel devices lacks compatible "
537 "property\n");
538 goto out_release;
539 }
540 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
541 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
542 "compat entry.\n", channel_devices_compat);
543 goto out_release;
544 }
545
546 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
547 if (!cfg_handle) {
548 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
549 cfg_handle_prop);
550 goto out_release;
551 }
552
553 cdev_cfg_handle = *cfg_handle;
554
555 root_vdev = vio_create_one(hp, root, NULL, NULL);
556 err = -ENODEV;
557 if (!root_vdev) {
558 printk(KERN_ERR "VIO: Could not create root device.\n");
559 goto out_release;
560 }
561
562 mdesc_register_notifier(&vio_device_notifier);
563 mdesc_register_notifier(&vio_ds_notifier);
564
565 mdesc_release(hp);
566
567 return err;
568
569out_release:
570 mdesc_release(hp);
571 return err;
572}
573
574postcore_initcall(vio_init);