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Linux/arch/sparc/kernel/vio.c

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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 
 22 static 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 
 49 static 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 
 57 static 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 
 69 static 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 
 96 static 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 
114 static 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 }
127 static DEVICE_ATTR_RO(devspec);
128 
129 static 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 }
135 static DEVICE_ATTR_RO(type);
136 
137 static 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 }
144 static DEVICE_ATTR_RO(modalias);
145 
146 static struct attribute *vio_dev_attrs[] = {
147         &dev_attr_devspec.attr,
148         &dev_attr_type.attr,
149         &dev_attr_modalias.attr,
150         NULL,
151  };
152 ATTRIBUTE_GROUPS(vio_dev);
153 
154 static 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 
163 int __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 }
173 EXPORT_SYMBOL(__vio_register_driver);
174 
175 void vio_unregister_driver(struct vio_driver *viodrv)
176 {
177         driver_unregister(&viodrv->driver);
178 }
179 EXPORT_SYMBOL(vio_unregister_driver);
180 
181 static void vio_dev_release(struct device *dev)
182 {
183         kfree(to_vio_dev(dev));
184 }
185 
186 static ssize_t
187 show_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 
199 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
200                    show_pciobppath_attr, NULL);
201 
202 static struct device_node *cdev_node;
203 
204 static struct vio_dev *root_vdev;
205 static u64 cdev_cfg_handle;
206 
207 static 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  */
238 u64 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 }
250 EXPORT_SYMBOL(vio_vdev_node);
251 
252 static 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 
283 int 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 }
290 EXPORT_SYMBOL(vio_set_intr);
291 
292 static 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 
413 static 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 
419 struct vio_remove_node_data {
420         struct mdesc_handle *hp;
421         u64 node;
422 };
423 
424 static 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 
440 static 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 
460 static 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  */
471 static 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 
492 static struct mdesc_notifier_client vio_ds_notifier = {
493         .add            = vio_add_ds,
494         .remove         = vio_remove,
495         .node_name      = "domain-services-port",
496 };
497 
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";
501 
502 static 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 
570 out_release:
571         mdesc_release(hp);
572         return err;
573 }
574 
575 postcore_initcall(vio_init);
576 

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