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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 engebret@us.ibm.com
6 * Santiago Leon santil@us.ibm.com
7 * Hollis Blanchard <hollisb@us.ibm.com>
8 * Stephen Rothwell
9 *
10 * Adapted to sparc64 by David S. Miller davem@davemloft.net
11 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/irq.h>
16#include <linux/export.h>
17#include <linux/init.h>
18
19#include <asm/mdesc.h>
20#include <asm/vio.h>
21
22static const struct vio_device_id *vio_match_device(
23 const struct vio_device_id *matches,
24 const struct vio_dev *dev)
25{
26 const char *type, *compat;
27 int len;
28
29 type = dev->type;
30 compat = dev->compat;
31 len = dev->compat_len;
32
33 while (matches->type[0] || matches->compat[0]) {
34 int match = 1;
35 if (matches->type[0])
36 match &= !strcmp(matches->type, type);
37
38 if (matches->compat[0]) {
39 match &= len &&
40 of_find_in_proplist(compat, matches->compat, len);
41 }
42 if (match)
43 return matches;
44 matches++;
45 }
46 return NULL;
47}
48
49static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
50{
51 const struct vio_dev *vio_dev = to_vio_dev(dev);
52
53 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
54 return 0;
55}
56
57static int vio_bus_match(struct device *dev, struct device_driver *drv)
58{
59 struct vio_dev *vio_dev = to_vio_dev(dev);
60 struct vio_driver *vio_drv = to_vio_driver(drv);
61 const struct vio_device_id *matches = vio_drv->id_table;
62
63 if (!matches)
64 return 0;
65
66 return vio_match_device(matches, vio_dev) != NULL;
67}
68
69static int vio_device_probe(struct device *dev)
70{
71 struct vio_dev *vdev = to_vio_dev(dev);
72 struct vio_driver *drv = to_vio_driver(dev->driver);
73 const struct vio_device_id *id;
74
75 if (!drv->probe)
76 return -ENODEV;
77
78 id = vio_match_device(drv->id_table, vdev);
79 if (!id)
80 return -ENODEV;
81
82 /* alloc irqs (unless the driver specified not to) */
83 if (!drv->no_irq) {
84 if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
85 vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
86 vdev->tx_ino);
87
88 if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
89 vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
90 vdev->rx_ino);
91 }
92
93 return drv->probe(vdev, id);
94}
95
96static int vio_device_remove(struct device *dev)
97{
98 struct vio_dev *vdev = to_vio_dev(dev);
99 struct vio_driver *drv = to_vio_driver(dev->driver);
100
101 if (drv->remove) {
102 /*
103 * Ideally, we would remove/deallocate tx/rx virqs
104 * here - however, there are currently no support
105 * routines to do so at the moment. TBD
106 */
107
108 return drv->remove(vdev);
109 }
110
111 return 1;
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 sprintf(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 sprintf(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 sprintf(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 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 snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
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(sizeof(*vdev), GFP_KERNEL);
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 dp = of_get_next_child(cdev_node, NULL);
370 while (dp) {
371 if (!strcmp(dp->type, type))
372 break;
373
374 dp = of_get_next_child(cdev_node, dp);
375 }
376 } else {
377 dp = to_vio_dev(parent)->dp;
378 }
379 vdev->dp = dp;
380
381 /*
382 * node_name is NULL for the parent/channel-devices node and
383 * the parent doesn't require the MD node info.
384 */
385 if (node_name != NULL) {
386 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
387 node_name);
388
389 err = mdesc_get_node_info(hp, mp, node_name,
390 &vdev->md_node_info);
391 if (err) {
392 pr_err("VIO: Could not get MD node info %s, err=%d\n",
393 dev_name(&vdev->dev), err);
394 kfree(vdev);
395 return NULL;
396 }
397 }
398
399 pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
400 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
401
402 err = device_register(&vdev->dev);
403 if (err) {
404 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
405 dev_name(&vdev->dev), err);
406 put_device(&vdev->dev);
407 return NULL;
408 }
409 if (vdev->dp)
410 err = sysfs_create_file(&vdev->dev.kobj,
411 &dev_attr_obppath.attr);
412
413 return vdev;
414}
415
416static void vio_add(struct mdesc_handle *hp, u64 node,
417 const char *node_name)
418{
419 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
420}
421
422struct vio_remove_node_data {
423 struct mdesc_handle *hp;
424 u64 node;
425};
426
427static int vio_md_node_match(struct device *dev, void *arg)
428{
429 struct vio_dev *vdev = to_vio_dev(dev);
430 struct vio_remove_node_data *node_data;
431 u64 node;
432
433 node_data = (struct vio_remove_node_data *)arg;
434
435 node = vio_vdev_node(node_data->hp, vdev);
436
437 if (node == node_data->node)
438 return 1;
439 else
440 return 0;
441}
442
443static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
444{
445 struct vio_remove_node_data node_data;
446 struct device *dev;
447
448 node_data.hp = hp;
449 node_data.node = node;
450
451 dev = device_find_child(&root_vdev->dev, (void *)&node_data,
452 vio_md_node_match);
453 if (dev) {
454 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
455
456 device_unregister(dev);
457 put_device(dev);
458 } else {
459 pr_err("VIO: %s node not found in MDESC\n", node_name);
460 }
461}
462
463static struct mdesc_notifier_client vio_device_notifier = {
464 .add = vio_add,
465 .remove = vio_remove,
466 .node_name = "virtual-device-port",
467};
468
469/* We are only interested in domain service ports under the
470 * "domain-services" node. On control nodes there is another port
471 * under "openboot" that we should not mess with as aparently that is
472 * reserved exclusively for OBP use.
473 */
474static void vio_add_ds(struct mdesc_handle *hp, u64 node,
475 const char *node_name)
476{
477 int found;
478 u64 a;
479
480 found = 0;
481 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
482 u64 target = mdesc_arc_target(hp, a);
483 const char *name = mdesc_node_name(hp, target);
484
485 if (!strcmp(name, "domain-services")) {
486 found = 1;
487 break;
488 }
489 }
490
491 if (found)
492 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
493}
494
495static struct mdesc_notifier_client vio_ds_notifier = {
496 .add = vio_add_ds,
497 .remove = vio_remove,
498 .node_name = "domain-services-port",
499};
500
501static const char *channel_devices_node = "channel-devices";
502static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
503static const char *cfg_handle_prop = "cfg-handle";
504
505static int __init vio_init(void)
506{
507 struct mdesc_handle *hp;
508 const char *compat;
509 const u64 *cfg_handle;
510 int err, len;
511 u64 root;
512
513 err = bus_register(&vio_bus_type);
514 if (err) {
515 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
516 err);
517 return err;
518 }
519
520 hp = mdesc_grab();
521 if (!hp)
522 return 0;
523
524 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
525 if (root == MDESC_NODE_NULL) {
526 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
527 mdesc_release(hp);
528 return 0;
529 }
530
531 cdev_node = of_find_node_by_name(NULL, "channel-devices");
532 err = -ENODEV;
533 if (!cdev_node) {
534 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
535 goto out_release;
536 }
537
538 compat = mdesc_get_property(hp, root, "compatible", &len);
539 if (!compat) {
540 printk(KERN_ERR "VIO: Channel devices lacks compatible "
541 "property\n");
542 goto out_release;
543 }
544 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
545 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
546 "compat entry.\n", channel_devices_compat);
547 goto out_release;
548 }
549
550 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
551 if (!cfg_handle) {
552 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
553 cfg_handle_prop);
554 goto out_release;
555 }
556
557 cdev_cfg_handle = *cfg_handle;
558
559 root_vdev = vio_create_one(hp, root, NULL, NULL);
560 err = -ENODEV;
561 if (!root_vdev) {
562 printk(KERN_ERR "VIO: Could not create root device.\n");
563 goto out_release;
564 }
565
566 mdesc_register_notifier(&vio_device_notifier);
567 mdesc_register_notifier(&vio_ds_notifier);
568
569 mdesc_release(hp);
570
571 return err;
572
573out_release:
574 mdesc_release(hp);
575 return err;
576}
577
578postcore_initcall(vio_init);
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 engebret@us.ibm.com
6 * Santiago Leon santil@us.ibm.com
7 * Hollis Blanchard <hollisb@us.ibm.com>
8 * Stephen Rothwell
9 *
10 * Adapted to sparc64 by David S. Miller davem@davemloft.net
11 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/irq.h>
16#include <linux/export.h>
17#include <linux/init.h>
18
19#include <asm/mdesc.h>
20#include <asm/vio.h>
21
22static const struct vio_device_id *vio_match_device(
23 const struct vio_device_id *matches,
24 const struct vio_dev *dev)
25{
26 const char *type, *compat;
27 int len;
28
29 type = dev->type;
30 compat = dev->compat;
31 len = dev->compat_len;
32
33 while (matches->type[0] || matches->compat[0]) {
34 int match = 1;
35 if (matches->type[0])
36 match &= !strcmp(matches->type, type);
37
38 if (matches->compat[0]) {
39 match &= len &&
40 of_find_in_proplist(compat, matches->compat, len);
41 }
42 if (match)
43 return matches;
44 matches++;
45 }
46 return NULL;
47}
48
49static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
50{
51 const struct vio_dev *vio_dev = to_vio_dev(dev);
52
53 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
54 return 0;
55}
56
57static int vio_bus_match(struct device *dev, struct device_driver *drv)
58{
59 struct vio_dev *vio_dev = to_vio_dev(dev);
60 struct vio_driver *vio_drv = to_vio_driver(drv);
61 const struct vio_device_id *matches = vio_drv->id_table;
62
63 if (!matches)
64 return 0;
65
66 return vio_match_device(matches, vio_dev) != NULL;
67}
68
69static int vio_device_probe(struct device *dev)
70{
71 struct vio_dev *vdev = to_vio_dev(dev);
72 struct vio_driver *drv = to_vio_driver(dev->driver);
73 const struct vio_device_id *id;
74
75 if (!drv->probe)
76 return -ENODEV;
77
78 id = vio_match_device(drv->id_table, vdev);
79 if (!id)
80 return -ENODEV;
81
82 /* alloc irqs (unless the driver specified not to) */
83 if (!drv->no_irq) {
84 if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
85 vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
86 vdev->tx_ino);
87
88 if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
89 vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
90 vdev->rx_ino);
91 }
92
93 return drv->probe(vdev, id);
94}
95
96static int vio_device_remove(struct device *dev)
97{
98 struct vio_dev *vdev = to_vio_dev(dev);
99 struct vio_driver *drv = to_vio_driver(dev->driver);
100
101 if (drv->remove) {
102 /*
103 * Ideally, we would remove/deallocate tx/rx virqs
104 * here - however, there are currently no support
105 * routines to do so at the moment. TBD
106 */
107
108 return drv->remove(vdev);
109 }
110
111 return 1;
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 sprintf(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 sprintf(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 sprintf(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 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 snprintf (buf, PAGE_SIZE, "%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(sizeof(*vdev), GFP_KERNEL);
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 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
384 node_name);
385
386 err = mdesc_get_node_info(hp, mp, node_name,
387 &vdev->md_node_info);
388 if (err) {
389 pr_err("VIO: Could not get MD node info %s, err=%d\n",
390 dev_name(&vdev->dev), err);
391 kfree(vdev);
392 return NULL;
393 }
394 }
395
396 pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
397 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
398
399 err = device_register(&vdev->dev);
400 if (err) {
401 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
402 dev_name(&vdev->dev), err);
403 put_device(&vdev->dev);
404 return NULL;
405 }
406 if (vdev->dp)
407 err = sysfs_create_file(&vdev->dev.kobj,
408 &dev_attr_obppath.attr);
409
410 return vdev;
411}
412
413static void vio_add(struct mdesc_handle *hp, u64 node,
414 const char *node_name)
415{
416 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
417}
418
419struct vio_remove_node_data {
420 struct mdesc_handle *hp;
421 u64 node;
422};
423
424static int vio_md_node_match(struct device *dev, void *arg)
425{
426 struct vio_dev *vdev = to_vio_dev(dev);
427 struct vio_remove_node_data *node_data;
428 u64 node;
429
430 node_data = (struct vio_remove_node_data *)arg;
431
432 node = vio_vdev_node(node_data->hp, vdev);
433
434 if (node == node_data->node)
435 return 1;
436 else
437 return 0;
438}
439
440static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
441{
442 struct vio_remove_node_data node_data;
443 struct device *dev;
444
445 node_data.hp = hp;
446 node_data.node = node;
447
448 dev = device_find_child(&root_vdev->dev, (void *)&node_data,
449 vio_md_node_match);
450 if (dev) {
451 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
452
453 device_unregister(dev);
454 put_device(dev);
455 } else {
456 pr_err("VIO: %s node not found in MDESC\n", node_name);
457 }
458}
459
460static struct mdesc_notifier_client vio_device_notifier = {
461 .add = vio_add,
462 .remove = vio_remove,
463 .node_name = "virtual-device-port",
464};
465
466/* We are only interested in domain service ports under the
467 * "domain-services" node. On control nodes there is another port
468 * under "openboot" that we should not mess with as aparently that is
469 * reserved exclusively for OBP use.
470 */
471static void vio_add_ds(struct mdesc_handle *hp, u64 node,
472 const char *node_name)
473{
474 int found;
475 u64 a;
476
477 found = 0;
478 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
479 u64 target = mdesc_arc_target(hp, a);
480 const char *name = mdesc_node_name(hp, target);
481
482 if (!strcmp(name, "domain-services")) {
483 found = 1;
484 break;
485 }
486 }
487
488 if (found)
489 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
490}
491
492static struct mdesc_notifier_client vio_ds_notifier = {
493 .add = vio_add_ds,
494 .remove = vio_remove,
495 .node_name = "domain-services-port",
496};
497
498static const char *channel_devices_node = "channel-devices";
499static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
500static const char *cfg_handle_prop = "cfg-handle";
501
502static int __init vio_init(void)
503{
504 struct mdesc_handle *hp;
505 const char *compat;
506 const u64 *cfg_handle;
507 int err, len;
508 u64 root;
509
510 err = bus_register(&vio_bus_type);
511 if (err) {
512 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
513 err);
514 return err;
515 }
516
517 hp = mdesc_grab();
518 if (!hp)
519 return 0;
520
521 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
522 if (root == MDESC_NODE_NULL) {
523 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
524 mdesc_release(hp);
525 return 0;
526 }
527
528 cdev_node = of_find_node_by_name(NULL, "channel-devices");
529 err = -ENODEV;
530 if (!cdev_node) {
531 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
532 goto out_release;
533 }
534
535 compat = mdesc_get_property(hp, root, "compatible", &len);
536 if (!compat) {
537 printk(KERN_ERR "VIO: Channel devices lacks compatible "
538 "property\n");
539 goto out_release;
540 }
541 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
542 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
543 "compat entry.\n", channel_devices_compat);
544 goto out_release;
545 }
546
547 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
548 if (!cfg_handle) {
549 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
550 cfg_handle_prop);
551 goto out_release;
552 }
553
554 cdev_cfg_handle = *cfg_handle;
555
556 root_vdev = vio_create_one(hp, root, NULL, NULL);
557 err = -ENODEV;
558 if (!root_vdev) {
559 printk(KERN_ERR "VIO: Could not create root device.\n");
560 goto out_release;
561 }
562
563 mdesc_register_notifier(&vio_device_notifier);
564 mdesc_register_notifier(&vio_ds_notifier);
565
566 mdesc_release(hp);
567
568 return err;
569
570out_release:
571 mdesc_release(hp);
572 return err;
573}
574
575postcore_initcall(vio_init);