1 // SPDX-License-Identifier: GPL-2.0
2 /* vio.c: Virtual I/O channel devices probing infrastructure.
4 * Copyright (c) 2003-2005 IBM Corp.
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(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 int 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
108 return drv->remove(vdev);
114 static ssize_t devspec_show(struct device *dev,
115 struct device_attribute *attr, char *buf)
117 struct vio_dev *vdev = to_vio_dev(dev);
118 const char *str = "none";
120 if (!strcmp(vdev->type, "vnet-port"))
122 else if (!strcmp(vdev->type, "vdc-port"))
125 return sprintf(buf, "%s\n", str);
127 static DEVICE_ATTR_RO(devspec);
129 static ssize_t type_show(struct device *dev,
130 struct device_attribute *attr, char *buf)
132 struct vio_dev *vdev = to_vio_dev(dev);
133 return sprintf(buf, "%s\n", vdev->type);
135 static DEVICE_ATTR_RO(type);
137 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
140 const struct vio_dev *vdev = to_vio_dev(dev);
142 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
144 static DEVICE_ATTR_RO(modalias);
146 static struct attribute *vio_dev_attrs[] = {
147 &dev_attr_devspec.attr,
149 &dev_attr_modalias.attr,
152 ATTRIBUTE_GROUPS(vio_dev);
154 static struct bus_type vio_bus_type = {
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,
163 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
164 const char *mod_name)
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;
171 return driver_register(&viodrv->driver);
173 EXPORT_SYMBOL(__vio_register_driver);
175 void vio_unregister_driver(struct vio_driver *viodrv)
177 driver_unregister(&viodrv->driver);
179 EXPORT_SYMBOL(vio_unregister_driver);
181 static void vio_dev_release(struct device *dev)
183 kfree(to_vio_dev(dev));
187 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
190 struct vio_dev *vdev;
191 struct device_node *dp;
193 vdev = to_vio_dev(dev);
196 return snprintf (buf, PAGE_SIZE, "%pOF\n", dp);
199 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
200 show_pciobppath_attr, NULL);
202 static struct device_node *cdev_node;
204 static struct vio_dev *root_vdev;
205 static u64 cdev_cfg_handle;
207 static const u64 *vio_cfg_handle(struct mdesc_handle *hp, u64 node)
209 const u64 *cfg_handle = NULL;
212 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
215 target = mdesc_arc_target(hp, a);
216 cfg_handle = mdesc_get_property(hp, target,
226 * vio_vdev_node() - Find VDEV node in MD
227 * @hp: Handle to the MD
228 * @vdev: Pointer to VDEV
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
234 * NOTE: the MD must be locked, using mdesc_grab(), when calling this routine
236 * Return: The VDEV node in MDESC
238 u64 vio_vdev_node(struct mdesc_handle *hp, struct vio_dev *vdev)
243 return MDESC_NODE_NULL;
245 node = mdesc_get_node(hp, (const char *)vdev->node_name,
246 &vdev->md_node_info);
250 EXPORT_SYMBOL(vio_vdev_node);
252 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
253 struct vio_dev *vdev)
259 vdev->channel_id = ~0UL;
260 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
265 target = mdesc_arc_target(hp, a);
267 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
271 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
275 chan_id = mdesc_get_property(hp, target, "id", NULL);
277 vdev->channel_id = *chan_id;
280 vdev->cdev_handle = cdev_cfg_handle;
283 int vio_set_intr(unsigned long dev_ino, int state)
287 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
290 EXPORT_SYMBOL(vio_set_intr);
292 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
293 const char *node_name,
294 struct device *parent)
296 const char *type, *compat;
297 struct device_node *dp;
298 struct vio_dev *vdev;
300 const u64 *id, *cfg_handle;
302 type = mdesc_get_property(hp, mp, "device-type", &tlen);
304 type = mdesc_get_property(hp, mp, "name", &tlen);
306 type = mdesc_node_name(hp, mp);
307 tlen = strlen(type) + 1;
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",
316 id = mdesc_get_property(hp, mp, "id", NULL);
318 cfg_handle = vio_cfg_handle(hp, mp);
320 compat = mdesc_get_property(hp, mp, "device-type", &clen);
323 } else if (clen > VIO_MAX_COMPAT_LEN) {
324 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
329 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
331 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
336 memcpy(vdev->type, type, tlen);
338 memcpy(vdev->compat, compat, clen);
340 memset(vdev->compat, 0, sizeof(vdev->compat));
341 vdev->compat_len = clen;
343 vdev->port_id = ~0UL;
347 vio_fill_channel_info(hp, mp, vdev);
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);
356 dev_set_name(&vdev->dev, "%s-%llu-%llu", type,
358 vdev->dev_no = *cfg_handle;
362 vdev->dev.parent = parent;
363 vdev->dev.bus = &vio_bus_type;
364 vdev->dev.release = vio_dev_release;
366 if (parent == NULL) {
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))
374 dp = to_vio_dev(parent)->dp;
379 * node_name is NULL for the parent/channel-devices node and
380 * the parent doesn't require the MD node info.
382 if (node_name != NULL) {
383 (void) snprintf(vdev->node_name, VIO_MAX_NAME_LEN, "%s",
386 err = mdesc_get_node_info(hp, mp, node_name,
387 &vdev->md_node_info);
389 pr_err("VIO: Could not get MD node info %s, err=%d\n",
390 dev_name(&vdev->dev), err);
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);
399 err = device_register(&vdev->dev);
401 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
402 dev_name(&vdev->dev), err);
403 put_device(&vdev->dev);
407 err = sysfs_create_file(&vdev->dev.kobj,
408 &dev_attr_obppath.attr);
413 static void vio_add(struct mdesc_handle *hp, u64 node,
414 const char *node_name)
416 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
419 struct vio_remove_node_data {
420 struct mdesc_handle *hp;
424 static int vio_md_node_match(struct device *dev, void *arg)
426 struct vio_dev *vdev = to_vio_dev(dev);
427 struct vio_remove_node_data *node_data;
430 node_data = (struct vio_remove_node_data *)arg;
432 node = vio_vdev_node(node_data->hp, vdev);
434 if (node == node_data->node)
440 static void vio_remove(struct mdesc_handle *hp, u64 node, const char *node_name)
442 struct vio_remove_node_data node_data;
446 node_data.node = node;
448 dev = device_find_child(&root_vdev->dev, (void *)&node_data,
451 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
453 device_unregister(dev);
456 pr_err("VIO: %s node not found in MDESC\n", node_name);
460 static struct mdesc_notifier_client vio_device_notifier = {
462 .remove = vio_remove,
463 .node_name = "virtual-device-port",
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.
471 static void vio_add_ds(struct mdesc_handle *hp, u64 node,
472 const char *node_name)
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);
482 if (!strcmp(name, "domain-services")) {
489 (void) vio_create_one(hp, node, node_name, &root_vdev->dev);
492 static struct mdesc_notifier_client vio_ds_notifier = {
494 .remove = vio_remove,
495 .node_name = "domain-services-port",
498 static const char *channel_devices_node = "channel-devices";
499 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
500 static const char *cfg_handle_prop = "cfg-handle";
502 static int __init vio_init(void)
504 struct mdesc_handle *hp;
506 const u64 *cfg_handle;
510 err = bus_register(&vio_bus_type);
512 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
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");
528 cdev_node = of_find_node_by_name(NULL, "channel-devices");
531 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
535 compat = mdesc_get_property(hp, root, "compatible", &len);
537 printk(KERN_ERR "VIO: Channel devices lacks compatible "
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);
547 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
549 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
554 cdev_cfg_handle = *cfg_handle;
556 root_vdev = vio_create_one(hp, root, NULL, NULL);
559 printk(KERN_ERR "VIO: Could not create root device.\n");
563 mdesc_register_notifier(&vio_device_notifier);
564 mdesc_register_notifier(&vio_ds_notifier);
575 postcore_initcall(vio_init);