1 // SPDX-License-Identifier: GPL-2.0
2 /* vio.c: Virtual I/O channel devices probing infrastructure.
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>
10 * Adapted to sparc64 by David S. Miller davem@davemloft.net
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>
19 #include <asm/mdesc.h>
22 static const struct vio_device_id *vio_match_device(
23 const struct vio_device_id *matches,
24 const struct vio_dev *dev)
26 const char *type, *compat;
31 len = dev->compat_len;
33 while (matches->type[0] || matches->compat[0]) {
36 match &= !strcmp(matches->type, type);
38 if (matches->compat[0]) {
40 of_find_in_proplist(compat, matches->compat, len);
49 static int vio_hotplug(const struct device *dev, struct kobj_uevent_env *env)
51 const struct vio_dev *vio_dev = to_vio_dev(dev);
53 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
57 static int vio_bus_match(struct device *dev, struct device_driver *drv)
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;
66 return vio_match_device(matches, vio_dev) != NULL;
69 static int vio_device_probe(struct device *dev)
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;
78 id = vio_match_device(drv->id_table, vdev);
82 /* alloc irqs (unless the driver specified not to) */
84 if (vdev->tx_irq == 0 && vdev->tx_ino != ~0UL)
85 vdev->tx_irq = sun4v_build_virq(vdev->cdev_handle,
88 if (vdev->rx_irq == 0 && vdev->rx_ino != ~0UL)
89 vdev->rx_irq = sun4v_build_virq(vdev->cdev_handle,
93 return drv->probe(vdev, id);
96 static void vio_device_remove(struct device *dev)
98 struct vio_dev *vdev = to_vio_dev(dev);
99 struct vio_driver *drv = to_vio_driver(dev->driver);
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
112 static ssize_t devspec_show(struct device *dev,
113 struct device_attribute *attr, char *buf)
115 struct vio_dev *vdev = to_vio_dev(dev);
116 const char *str = "none";
118 if (!strcmp(vdev->type, "vnet-port"))
120 else if (!strcmp(vdev->type, "vdc-port"))
123 return sprintf(buf, "%s\n", str);
125 static DEVICE_ATTR_RO(devspec);
127 static ssize_t type_show(struct device *dev,
128 struct device_attribute *attr, char *buf)
130 struct vio_dev *vdev = to_vio_dev(dev);
131 return sprintf(buf, "%s\n", vdev->type);
133 static DEVICE_ATTR_RO(type);
135 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
138 const struct vio_dev *vdev = to_vio_dev(dev);
140 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
142 static DEVICE_ATTR_RO(modalias);
144 static struct attribute *vio_dev_attrs[] = {
145 &dev_attr_devspec.attr,
147 &dev_attr_modalias.attr,
150 ATTRIBUTE_GROUPS(vio_dev);
152 static const struct bus_type vio_bus_type = {
154 .dev_groups = vio_dev_groups,
155 .uevent = vio_hotplug,
156 .match = vio_bus_match,
157 .probe = vio_device_probe,
158 .remove = vio_device_remove,
161 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
162 const char *mod_name)
164 viodrv->driver.bus = &vio_bus_type;
165 viodrv->driver.name = viodrv->name;
166 viodrv->driver.owner = owner;
167 viodrv->driver.mod_name = mod_name;
169 return driver_register(&viodrv->driver);
171 EXPORT_SYMBOL(__vio_register_driver);
173 void vio_unregister_driver(struct vio_driver *viodrv)
175 driver_unregister(&viodrv->driver);
177 EXPORT_SYMBOL(vio_unregister_driver);
179 static void vio_dev_release(struct device *dev)
181 kfree(to_vio_dev(dev));
185 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
188 struct vio_dev *vdev;
189 struct device_node *dp;
191 vdev = to_vio_dev(dev);
194 return scnprintf(buf, PAGE_SIZE, "%pOF\n", dp);
197 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
198 show_pciobppath_attr, NULL);
200 static struct device_node *cdev_node;
202 static struct vio_dev *root_vdev;
203 static u64 cdev_cfg_handle;
205 static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node)
207 const u64 *cfg_handle = NULL;
210 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
213 target = mdesc_arc_target(hp, a);
214 cfg_handle = mdesc_get_property(hp, target,
224 * vio_vdev_node() - Find VDEV node in MD
225 * @hp: Handle to the MD
226 * @vdev: Pointer to VDEV
228 * Find the node in the current MD which matches the given vio_dev. This
229 * must be done dynamically since the node value can change if the MD
232 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine
234 * Return: The VDEV node in MDESC
236 u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)
241 return MDESC_NODE_NULL;
243 node = mdesc_get_node(hp, (const char *)vdev->node_name,
244 &vdev->md_node_info);
248 EXPORT_SYMBOL(vio_vdev_node);
250 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
251 struct vio_dev *vdev)
257 vdev->channel_id = ~0UL;
258 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
263 target = mdesc_arc_target(hp, a);
265 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
269 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
273 chan_id = mdesc_get_property(hp, target, "id", NULL);
275 vdev->channel_id = *chan_id;
278 vdev->cdev_handle = cdev_cfg_handle;
281 int vio_set_intr(unsigned long dev_ino, int state)
285 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
288 EXPORT_SYMBOL(vio_set_intr);
290 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
291 const char *node_name,
292 struct device *parent)
294 const char *type, *compat;
295 struct device_node *dp;
296 struct vio_dev *vdev;
298 const u64 *id, *cfg_handle;
300 type = mdesc_get_property(hp, mp, "device-type", &tlen);
302 type = mdesc_get_property(hp, mp, "name", &tlen);
304 type = mdesc_node_name(hp, mp);
305 tlen = strlen(type) + 1;
308 if (tlen > VIO_MAX_TYPE_LEN || strlen(type) >= VIO_MAX_TYPE_LEN) {
309 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
314 id = mdesc_get_property(hp, mp, "id", NULL);
316 cfg_handle = vio_cfg_handle(hp, mp);
318 compat = mdesc_get_property(hp, mp, "device-type", &clen);
321 } else if (clen > VIO_MAX_COMPAT_LEN) {
322 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
327 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
329 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
334 memcpy(vdev->type, type, tlen);
336 memcpy(vdev->compat, compat, clen);
338 memset(vdev->compat, 0, sizeof(vdev->compat));
339 vdev->compat_len = clen;
341 vdev->port_id = ~0UL;
345 vio_fill_channel_info(hp, mp, vdev);
348 dev_set_name(&vdev->dev, "%s", type);
349 vdev->dev_no = ~(u64)0;
350 } else if (!cfg_handle) {
351 dev_set_name(&vdev->dev, "%s-%llu", type, *id);
354 dev_set_name(&vdev->dev, "%s-%llu-%llu", type,
356 vdev->dev_no = *cfg_handle;
360 vdev->dev.parent = parent;
361 vdev->dev.bus = &vio_bus_type;
362 vdev->dev.release = vio_dev_release;
364 if (parent == NULL) {
366 } else if (to_vio_dev(parent) == root_vdev) {
367 for_each_child_of_node(cdev_node, dp) {
368 if (of_node_is_type(dp, type))
372 dp = to_vio_dev(parent)->dp;
377 * node_name is NULL for the parent/channel-devices node and
378 * the parent doesn't require the MD node info.
380 if (node_name != NULL) {
381 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
384 err = mdesc_get_node_info(hp, mp, node_name,
385 &vdev->md_node_info);
387 pr_err("VIO: Could not get MD node info %s, err=%d\n",
388 dev_name(&vdev->dev), err);
394 pr_info("VIO: Adding device %s (tx_ino = %llx, rx_ino = %llx)\n",
395 dev_name(&vdev->dev), vdev->tx_ino, vdev->rx_ino);
397 err = device_register(&vdev->dev);
399 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
400 dev_name(&vdev->dev), err);
401 put_device(&vdev->dev);
405 err = sysfs_create_file(&vdev->dev.kobj,
406 &dev_attr_obppath.attr);
411 static void vio_add(struct mdesc_handle *hp, u64 node,
412 const char *node_name)
414 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
417 struct vio_remove_node_data {
418 struct mdesc_handle *hp;
422 static int vio_md_node_match(struct device *dev, void *arg)
424 struct vio_dev *vdev = to_vio_dev(dev);
425 struct vio_remove_node_data *node_data;
428 node_data = (struct vio_remove_node_data *)arg;
430 node = vio_vdev_node(node_data->hp, vdev);
432 if (node == node_data->node)
438 static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
440 struct vio_remove_node_data node_data;
444 node_data.node = node;
446 dev = device_find_child(&root_vdev->dev, (void *)&node_data,
449 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
451 device_unregister(dev);
454 pr_err("VIO: %s node not found in MDESC\n", node_name);
458 static struct mdesc_notifier_client vio_device_notifier = {
460 .remove = vio_remove,
461 .node_name = "virtual-device-port",
464 /* We are only interested in domain service ports under the
465 * "domain-services" node. On control nodes there is another port
466 * under "openboot" that we should not mess with as aparently that is
467 * reserved exclusively for OBP use.
469 static void vio_add_ds(struct mdesc_handle *hp, u64 node,
470 const char *node_name)
476 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
477 u64 target = mdesc_arc_target(hp, a);
478 const char *name = mdesc_node_name(hp, target);
480 if (!strcmp(name, "domain-services")) {
487 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
490 static struct mdesc_notifier_client vio_ds_notifier = {
492 .remove = vio_remove,
493 .node_name = "domain-services-port",
496 static const char *channel_devices_node = "channel-devices";
497 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
498 static const char *cfg_handle_prop = "cfg-handle";
500 static int __init vio_init(void)
502 struct mdesc_handle *hp;
504 const u64 *cfg_handle;
508 err = bus_register(&vio_bus_type);
510 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
519 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
520 if (root == MDESC_NODE_NULL) {
521 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
526 cdev_node = of_find_node_by_name(NULL, "channel-devices");
529 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
533 compat = mdesc_get_property(hp, root, "compatible", &len);
535 printk(KERN_ERR "VIO: Channel devices lacks compatible "
539 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
540 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
541 "compat entry.\n", channel_devices_compat);
545 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
547 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
552 cdev_cfg_handle = *cfg_handle;
554 root_vdev = vio_create_one(hp, root, NULL, NULL);
557 printk(KERN_ERR "VIO: Could not create root device.\n");
561 mdesc_register_notifier(&vio_device_notifier);
562 mdesc_register_notifier(&vio_ds_notifier);
573 postcore_initcall(vio_init);