1 /* vio.c: Virtual I/O channel devices probing infrastructure.
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>
9 * Adapted to sparc64 by David S. Miller davem@davemloft.net
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/irq.h>
15 #include <linux/export.h>
16 #include <linux/init.h>
18 #include <asm/mdesc.h>
21 static const struct vio_device_id *vio_match_device(
22 const struct vio_device_id *matches,
23 const struct vio_dev *dev)
25 const char *type, *compat;
30 len = dev->compat_len;
32 while (matches->type[0] || matches->compat[0]) {
35 match &= !strcmp(matches->type, type);
37 if (matches->compat[0]) {
39 of_find_in_proplist(compat, matches->compat, len);
48 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
50 const struct vio_dev *vio_dev = to_vio_dev(dev);
52 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
56 static int vio_bus_match(struct device *dev, struct device_driver *drv)
58 struct vio_dev *vio_dev = to_vio_dev(dev);
59 struct vio_driver *vio_drv = to_vio_driver(drv);
60 const struct vio_device_id *matches = vio_drv->id_table;
65 return vio_match_device(matches, vio_dev) != NULL;
68 static int vio_device_probe(struct device *dev)
70 struct vio_dev *vdev = to_vio_dev(dev);
71 struct vio_driver *drv = to_vio_driver(dev->driver);
72 const struct vio_device_id *id;
76 id = vio_match_device(drv->id_table, vdev);
78 error = drv->probe(vdev, id);
84 static int vio_device_remove(struct device *dev)
86 struct vio_dev *vdev = to_vio_dev(dev);
87 struct vio_driver *drv = to_vio_driver(dev->driver);
90 return drv->remove(vdev);
95 static ssize_t devspec_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
98 struct vio_dev *vdev = to_vio_dev(dev);
99 const char *str = "none";
101 if (!strcmp(vdev->type, "vnet-port"))
103 else if (!strcmp(vdev->type, "vdc-port"))
106 return sprintf(buf, "%s\n", str);
109 static ssize_t type_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
112 struct vio_dev *vdev = to_vio_dev(dev);
113 return sprintf(buf, "%s\n", vdev->type);
116 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
119 const struct vio_dev *vdev = to_vio_dev(dev);
121 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
124 static struct device_attribute vio_dev_attrs[] = {
131 static struct bus_type vio_bus_type = {
133 .dev_attrs = vio_dev_attrs,
134 .uevent = vio_hotplug,
135 .match = vio_bus_match,
136 .probe = vio_device_probe,
137 .remove = vio_device_remove,
140 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
141 const char *mod_name)
143 viodrv->driver.bus = &vio_bus_type;
144 viodrv->driver.name = viodrv->name;
145 viodrv->driver.owner = owner;
146 viodrv->driver.mod_name = mod_name;
148 return driver_register(&viodrv->driver);
150 EXPORT_SYMBOL(__vio_register_driver);
152 void vio_unregister_driver(struct vio_driver *viodrv)
154 driver_unregister(&viodrv->driver);
156 EXPORT_SYMBOL(vio_unregister_driver);
158 static void vio_dev_release(struct device *dev)
160 kfree(to_vio_dev(dev));
164 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
167 struct vio_dev *vdev;
168 struct device_node *dp;
170 vdev = to_vio_dev(dev);
173 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
176 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
177 show_pciobppath_attr, NULL);
179 static struct device_node *cdev_node;
181 static struct vio_dev *root_vdev;
182 static u64 cdev_cfg_handle;
184 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
185 struct vio_dev *vdev)
189 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
194 target = mdesc_arc_target(hp, a);
196 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
198 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
200 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
202 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
206 chan_id = mdesc_get_property(hp, target, "id", NULL);
208 vdev->channel_id = *chan_id;
212 int vio_set_intr(unsigned long dev_ino, int state)
216 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
219 EXPORT_SYMBOL(vio_set_intr);
221 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
222 struct device *parent)
224 const char *type, *compat, *bus_id_name;
225 struct device_node *dp;
226 struct vio_dev *vdev;
228 const u64 *id, *cfg_handle;
231 type = mdesc_get_property(hp, mp, "device-type", &tlen);
233 type = mdesc_get_property(hp, mp, "name", &tlen);
235 type = mdesc_node_name(hp, mp);
236 tlen = strlen(type) + 1;
239 if (tlen > VIO_MAX_TYPE_LEN) {
240 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
245 id = mdesc_get_property(hp, mp, "id", NULL);
248 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
251 target = mdesc_arc_target(hp, a);
252 cfg_handle = mdesc_get_property(hp, target,
259 if (!strcmp(type, "domain-services-port"))
263 * 20 char is the old driver-core name size limit, which is no more.
264 * This check can probably be removed after review and possible
265 * adaption of the vio users name length handling.
267 if (strlen(bus_id_name) >= 20 - 4) {
268 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
273 compat = mdesc_get_property(hp, mp, "device-type", &clen);
276 } else if (clen > VIO_MAX_COMPAT_LEN) {
277 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
282 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
284 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
289 memcpy(vdev->type, type, tlen);
291 memcpy(vdev->compat, compat, clen);
293 memset(vdev->compat, 0, sizeof(vdev->compat));
294 vdev->compat_len = clen;
296 vdev->channel_id = ~0UL;
300 vio_fill_channel_info(hp, mp, vdev);
303 dev_set_name(&vdev->dev, "%s", bus_id_name);
304 vdev->dev_no = ~(u64)0;
305 } else if (!cfg_handle) {
306 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
309 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
311 vdev->dev_no = *cfg_handle;
314 vdev->dev.parent = parent;
315 vdev->dev.bus = &vio_bus_type;
316 vdev->dev.release = vio_dev_release;
318 if (parent == NULL) {
320 } else if (to_vio_dev(parent) == root_vdev) {
321 dp = of_get_next_child(cdev_node, NULL);
323 if (!strcmp(dp->type, type))
326 dp = of_get_next_child(cdev_node, dp);
329 dp = to_vio_dev(parent)->dp;
333 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
335 err = device_register(&vdev->dev);
337 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
338 dev_name(&vdev->dev), err);
343 err = sysfs_create_file(&vdev->dev.kobj,
344 &dev_attr_obppath.attr);
349 static void vio_add(struct mdesc_handle *hp, u64 node)
351 (void) vio_create_one(hp, node, &root_vdev->dev);
354 static int vio_md_node_match(struct device *dev, void *arg)
356 struct vio_dev *vdev = to_vio_dev(dev);
358 if (vdev->mp == (u64) arg)
364 static void vio_remove(struct mdesc_handle *hp, u64 node)
368 dev = device_find_child(&root_vdev->dev, (void *) node,
371 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
373 device_unregister(dev);
378 static struct mdesc_notifier_client vio_device_notifier = {
380 .remove = vio_remove,
381 .node_name = "virtual-device-port",
384 /* We are only interested in domain service ports under the
385 * "domain-services" node. On control nodes there is another port
386 * under "openboot" that we should not mess with as aparently that is
387 * reserved exclusively for OBP use.
389 static void vio_add_ds(struct mdesc_handle *hp, u64 node)
395 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
396 u64 target = mdesc_arc_target(hp, a);
397 const char *name = mdesc_node_name(hp, target);
399 if (!strcmp(name, "domain-services")) {
406 (void) vio_create_one(hp, node, &root_vdev->dev);
409 static struct mdesc_notifier_client vio_ds_notifier = {
411 .remove = vio_remove,
412 .node_name = "domain-services-port",
415 static const char *channel_devices_node = "channel-devices";
416 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
417 static const char *cfg_handle_prop = "cfg-handle";
419 static int __init vio_init(void)
421 struct mdesc_handle *hp;
423 const u64 *cfg_handle;
427 err = bus_register(&vio_bus_type);
429 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
438 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
439 if (root == MDESC_NODE_NULL) {
440 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
445 cdev_node = of_find_node_by_name(NULL, "channel-devices");
448 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
452 compat = mdesc_get_property(hp, root, "compatible", &len);
454 printk(KERN_ERR "VIO: Channel devices lacks compatible "
458 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
459 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
460 "compat entry.\n", channel_devices_compat);
464 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
466 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
471 cdev_cfg_handle = *cfg_handle;
473 root_vdev = vio_create_one(hp, root, NULL);
476 printk(KERN_ERR "VIO: Could not create root device.\n");
480 mdesc_register_notifier(&vio_device_notifier);
481 mdesc_register_notifier(&vio_ds_notifier);
492 postcore_initcall(vio_init);