xref: /illumos-gate/usr/src/uts/common/io/pseudonex.c (revision b38ce9de)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 
27 /*
28  * Pseudo devices are devices implemented entirely in software; pseudonex
29  * (pseudo) is the traditional nexus for pseudodevices.  Instances are
30  * typically specified via driver.conf files; e.g. a leaf device which
31  * should be attached below pseudonex will have an entry like:
32  *
33  *	name="foo" parent="/pseudo" instance=0;
34  *
35  * pseudonex also supports the devctl (see <sys/devctl.h>) interface via
36  * its :devctl minor node.  This allows priveleged userland applications to
37  * online/offline children of pseudo as needed.
38  *
39  * In general, we discourage widespread use of this tactic, as it may lead to a
40  * proliferation of nodes in /pseudo.  It is preferred that implementors update
41  * pseudo.conf, adding another 'pseudo' nexus child of /pseudo, and then use
42  * that for their collection of device nodes.  To do so, add a driver alias
43  * for the name of the nexus child and a line in pseudo.conf such as:
44  *
45  *	name="foo" parent="/pseudo" instance=<n> valid-children="bar","baz";
46  *
47  * Setting 'valid-children' is important because we have an annoying problem;
48  * we need to prevent pseudo devices with 'parent="pseudo"' set from binding
49  * to our new pseudonex child node.  A better way might be to teach the
50  * spec-node code to understand that parent="pseudo" really means
51  * parent="/pseudo".
52  *
53  * At some point in the future, it would be desirable to extend the instance
54  * database to include nexus children of pseudo.  Then we could use devctl
55  * or devfs to online nexus children of pseudo, auto-selecting an instance #,
56  * and the instance number selected would be preserved across reboot in
57  * path_to_inst.
58  */
59 
60 #include <sys/types.h>
61 #include <sys/cmn_err.h>
62 #include <sys/conf.h>
63 #include <sys/ddi.h>
64 #include <sys/ddi_impldefs.h>
65 #include <sys/devops.h>
66 #include <sys/instance.h>
67 #include <sys/modctl.h>
68 #include <sys/open.h>
69 #include <sys/stat.h>
70 #include <sys/sunddi.h>
71 #include <sys/sunndi.h>
72 #include <sys/systm.h>
73 #include <sys/mkdev.h>
74 
75 /*
76  * Config information
77  */
78 static int pseudonex_intr_op(dev_info_t *dip, dev_info_t *rdip,
79 	    ddi_intr_op_t op, ddi_intr_handle_impl_t *hdlp, void *result);
80 
81 static int pseudonex_attach(dev_info_t *, ddi_attach_cmd_t);
82 static int pseudonex_detach(dev_info_t *, ddi_detach_cmd_t);
83 static int pseudonex_open(dev_t *, int, int, cred_t *);
84 static int pseudonex_close(dev_t, int, int, cred_t *);
85 static int pseudonex_ioctl(dev_t, int, intptr_t, int, cred_t *, int *);
86 static int pseudonex_fm_init(dev_info_t *, dev_info_t *, int,
87     ddi_iblock_cookie_t *);
88 static int pseudonex_ctl(dev_info_t *, dev_info_t *, ddi_ctl_enum_t, void *,
89     void *);
90 
91 static void *pseudonex_state;
92 
93 typedef struct pseudonex_state {
94 	dev_info_t *pnx_devi;
95 	int pnx_fmcap;
96 	ddi_iblock_cookie_t pnx_fm_ibc;
97 } pseudonex_state_t;
98 
99 static struct bus_ops pseudonex_bus_ops = {
100 	BUSO_REV,
101 	nullbusmap,		/* bus_map */
102 	NULL,			/* bus_get_intrspec */
103 	NULL,			/* bus_add_intrspec */
104 	NULL,			/* bus_remove_intrspec */
105 	i_ddi_map_fault,	/* bus_map_fault */
106 	ddi_no_dma_map,		/* bus_dma_map */
107 	ddi_no_dma_allochdl,	/* bus_dma_allochdl */
108 	NULL,			/* bus_dma_freehdl */
109 	NULL,			/* bus_dma_bindhdl */
110 	NULL,			/* bus_dma_unbindhdl */
111 	NULL,			/* bus_dma_flush */
112 	NULL,			/* bus_dma_win */
113 	NULL,			/* bus_dma_ctl */
114 	pseudonex_ctl,		/* bus_ctl */
115 	ddi_bus_prop_op,	/* bus_prop_op */
116 	0,			/* bus_get_eventcookie */
117 	0,			/* bus_add_eventcall */
118 	0,			/* bus_remove_eventcall	*/
119 	0,			/* bus_post_event */
120 	NULL,			/* bus_intr_ctl */
121 	NULL,			/* bus_config */
122 	NULL,			/* bus_unconfig */
123 	pseudonex_fm_init,	/* bus_fm_init */
124 	NULL,			/* bus_fm_fini */
125 	NULL,			/* bus_fm_access_enter */
126 	NULL,			/* bus_fm_access_exit */
127 	NULL,			/* bus_power */
128 	pseudonex_intr_op	/* bus_intr_op */
129 };
130 
131 static struct cb_ops pseudonex_cb_ops = {
132 	pseudonex_open,			/* open */
133 	pseudonex_close,		/* close */
134 	nodev,				/* strategy */
135 	nodev,				/* print */
136 	nodev,				/* dump */
137 	nodev,				/* read */
138 	nodev,				/* write */
139 	pseudonex_ioctl,		/* ioctl */
140 	nodev,				/* devmap */
141 	nodev,				/* mmap */
142 	nodev,				/* segmap */
143 	nochpoll,			/* poll */
144 	ddi_prop_op,			/* cb_prop_op */
145 	0,				/* streamtab  */
146 	D_MP | D_NEW | D_HOTPLUG	/* Driver compatibility flag */
147 };
148 
149 static struct dev_ops pseudo_ops = {
150 	DEVO_REV,		/* devo_rev, */
151 	0,			/* refcnt  */
152 	ddi_getinfo_1to1,	/* info */
153 	nulldev,		/* identify */
154 	nulldev,		/* probe */
155 	pseudonex_attach,	/* attach */
156 	pseudonex_detach,	/* detach */
157 	nodev,			/* reset */
158 	&pseudonex_cb_ops,	/* driver operations */
159 	&pseudonex_bus_ops,	/* bus operations */
160 	nulldev,		/* power */
161 	ddi_quiesce_not_needed,		/* quiesce */
162 };
163 
164 /*
165  * Module linkage information for the kernel.
166  */
167 static struct modldrv modldrv = {
168 	&mod_driverops,
169 	"nexus driver for 'pseudo' 1.31",
170 	&pseudo_ops,
171 };
172 
173 static struct modlinkage modlinkage = {
174 	MODREV_1, (void *)&modldrv, NULL
175 };
176 
177 int
_init(void)178 _init(void)
179 {
180 	int err;
181 
182 	if ((err = ddi_soft_state_init(&pseudonex_state,
183 	    sizeof (pseudonex_state_t), 0)) != 0) {
184 		return (err);
185 	}
186 	if ((err = mod_install(&modlinkage)) != 0) {
187 		ddi_soft_state_fini(&pseudonex_state);
188 		return (err);
189 	}
190 	return (0);
191 }
192 
193 int
_fini(void)194 _fini(void)
195 {
196 	int err;
197 
198 	if ((err = mod_remove(&modlinkage)) != 0)
199 		return (err);
200 	ddi_soft_state_fini(&pseudonex_state);
201 	return (0);
202 }
203 
204 int
_info(struct modinfo * modinfop)205 _info(struct modinfo *modinfop)
206 {
207 	return (mod_info(&modlinkage, modinfop));
208 }
209 
210 /*ARGSUSED*/
211 static int
pseudonex_attach(dev_info_t * devi,ddi_attach_cmd_t cmd)212 pseudonex_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
213 {
214 	int instance;
215 	pseudonex_state_t *pnx_state;
216 
217 	switch (cmd) {
218 	case DDI_ATTACH:
219 		break;
220 	case DDI_RESUME:
221 		return (DDI_SUCCESS);
222 	default:
223 		return (DDI_FAILURE);
224 	}
225 
226 	/*
227 	 * Save the devi for this instance in the soft_state data.
228 	 */
229 	instance = ddi_get_instance(devi);
230 	if (ddi_soft_state_zalloc(pseudonex_state, instance) != DDI_SUCCESS)
231 		return (DDI_FAILURE);
232 	pnx_state = ddi_get_soft_state(pseudonex_state, instance);
233 	pnx_state->pnx_devi = devi;
234 
235 	pnx_state->pnx_fmcap = DDI_FM_EREPORT_CAPABLE;
236 	ddi_fm_init(devi, &pnx_state->pnx_fmcap, &pnx_state->pnx_fm_ibc);
237 
238 	if (ddi_create_minor_node(devi, "devctl", S_IFCHR, instance,
239 	    DDI_NT_NEXUS, 0) != DDI_SUCCESS) {
240 		ddi_remove_minor_node(devi, NULL);
241 		ddi_soft_state_free(pseudonex_state, instance);
242 		return (DDI_FAILURE);
243 	}
244 	ddi_report_dev(devi);
245 	return (DDI_SUCCESS);
246 }
247 
248 /*ARGSUSED*/
249 static int
pseudonex_detach(dev_info_t * devi,ddi_detach_cmd_t cmd)250 pseudonex_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
251 {
252 	int instance = ddi_get_instance(devi);
253 
254 	if (cmd == DDI_SUSPEND)
255 		return (DDI_SUCCESS);
256 
257 	if (cmd != DDI_DETACH)
258 		return (DDI_FAILURE);
259 
260 	ddi_fm_fini(devi);
261 	ddi_remove_minor_node(devi, NULL);
262 	ddi_soft_state_free(pseudonex_state, instance);
263 	return (DDI_SUCCESS);
264 }
265 
266 /*ARGSUSED*/
267 static int
pseudonex_open(dev_t * devp,int flags,int otyp,cred_t * credp)268 pseudonex_open(dev_t *devp, int flags, int otyp, cred_t *credp)
269 {
270 	int instance;
271 
272 	if (otyp != OTYP_CHR)
273 		return (EINVAL);
274 
275 	instance = getminor(*devp);
276 	if (ddi_get_soft_state(pseudonex_state, instance) == NULL)
277 		return (ENXIO);
278 
279 	return (0);
280 }
281 
282 /*ARGSUSED*/
283 static int
pseudonex_close(dev_t dev,int flags,int otyp,cred_t * credp)284 pseudonex_close(dev_t dev, int flags, int otyp, cred_t *credp)
285 {
286 	int instance;
287 
288 	if (otyp != OTYP_CHR)
289 		return (EINVAL);
290 
291 	instance = getminor(dev);
292 	if (ddi_get_soft_state(pseudonex_state, instance) == NULL)
293 		return (ENXIO);
294 
295 	return (0);
296 }
297 
298 /*ARGSUSED*/
299 static int
pseudonex_ioctl(dev_t dev,int cmd,intptr_t arg,int mode,cred_t * cred_p,int * rval_p)300 pseudonex_ioctl(dev_t dev,
301     int cmd, intptr_t arg, int mode, cred_t *cred_p, int *rval_p)
302 {
303 	int instance;
304 	pseudonex_state_t *pnx_state;
305 
306 	instance = getminor(dev);
307 	if ((pnx_state = ddi_get_soft_state(pseudonex_state, instance)) == NULL)
308 		return (ENXIO);
309 	ASSERT(pnx_state->pnx_devi);
310 	return (ndi_devctl_ioctl(pnx_state->pnx_devi, cmd, arg, mode, 0));
311 }
312 
313 /*
314  * pseudonex_intr_op: pseudonex convert an interrupt number to an
315  *			interrupt. NO OP for pseudo drivers.
316  */
317 /*ARGSUSED*/
318 static int
pseudonex_intr_op(dev_info_t * dip,dev_info_t * rdip,ddi_intr_op_t op,ddi_intr_handle_impl_t * hdlp,void * result)319 pseudonex_intr_op(dev_info_t *dip, dev_info_t *rdip, ddi_intr_op_t op,
320     ddi_intr_handle_impl_t *hdlp, void *result)
321 {
322 	return (DDI_FAILURE);
323 }
324 
325 static int
pseudonex_check_assignment(dev_info_t * child,int test_inst)326 pseudonex_check_assignment(dev_info_t *child, int test_inst)
327 {
328 	dev_info_t	*tdip;
329 	kmutex_t	*dmp;
330 	const char	*childname = ddi_driver_name(child);
331 	major_t		childmaj = ddi_name_to_major((char *)childname);
332 
333 	dmp = &devnamesp[childmaj].dn_lock;
334 	LOCK_DEV_OPS(dmp);
335 	for (tdip = devnamesp[childmaj].dn_head;
336 	    tdip != NULL; tdip = ddi_get_next(tdip)) {
337 		/* is this the current node? */
338 		if (tdip == child)
339 			continue;
340 		/* is this a duplicate instance? */
341 		if (test_inst == ddi_get_instance(tdip)) {
342 			UNLOCK_DEV_OPS(dmp);
343 			return (DDI_FAILURE);
344 		}
345 	}
346 	UNLOCK_DEV_OPS(dmp);
347 	return (DDI_SUCCESS);
348 }
349 
350 /*
351  * This is a nasty, slow hack.  But we're stuck with it until we do some
352  * major surgery on the instance assignment subsystem, to allow pseudonode
353  * instance assignment to be tracked there.
354  *
355  * To auto-assign an instance number, we exhaustively search the instance
356  * list for each possible instance number until we find one which is unused.
357  */
358 static int
pseudonex_auto_assign(dev_info_t * child)359 pseudonex_auto_assign(dev_info_t *child)
360 {
361 	dev_info_t	*tdip;
362 	kmutex_t	*dmp;
363 	const char	*childname = ddi_driver_name(child);
364 	major_t		childmaj = ddi_name_to_major((char *)childname);
365 	int inst = 0;
366 
367 	dmp = &devnamesp[childmaj].dn_lock;
368 	LOCK_DEV_OPS(dmp);
369 	for (inst = 0; inst <= MAXMIN32; inst++) {
370 		for (tdip = devnamesp[childmaj].dn_head; tdip != NULL;
371 		    tdip = ddi_get_next(tdip)) {
372 			/* is this the current node? */
373 			if (tdip == child)
374 				continue;
375 			if (inst == ddi_get_instance(tdip)) {
376 				break;
377 			}
378 		}
379 		if (tdip == NULL) {
380 			UNLOCK_DEV_OPS(dmp);
381 			return (inst);
382 		}
383 	}
384 	UNLOCK_DEV_OPS(dmp);
385 	return (-1);
386 }
387 
388 static int
pseudonex_fm_init(dev_info_t * dip,dev_info_t * tdip,int cap,ddi_iblock_cookie_t * ibc)389 pseudonex_fm_init(dev_info_t *dip, dev_info_t *tdip, int cap,
390     ddi_iblock_cookie_t *ibc)
391 {
392 	pseudonex_state_t *pnx_state;
393 
394 	pnx_state = ddi_get_soft_state(pseudonex_state, ddi_get_instance(dip));
395 	ASSERT(pnx_state != NULL);
396 	ASSERT(ibc != NULL);
397 	*ibc = pnx_state->pnx_fm_ibc;
398 	return (pnx_state->pnx_fmcap & cap);
399 }
400 
401 static int
pseudonex_ctl(dev_info_t * dip,dev_info_t * rdip,ddi_ctl_enum_t ctlop,void * arg,void * result)402 pseudonex_ctl(dev_info_t *dip, dev_info_t *rdip, ddi_ctl_enum_t ctlop,
403     void *arg, void *result)
404 {
405 	switch (ctlop) {
406 	case DDI_CTLOPS_REPORTDEV:
407 		if (rdip == NULL)
408 			return (DDI_FAILURE);
409 		cmn_err(CE_CONT, "?pseudo-device: %s%d\n",
410 		    ddi_driver_name(rdip), ddi_get_instance(rdip));
411 		return (DDI_SUCCESS);
412 
413 	case DDI_CTLOPS_INITCHILD:
414 	{
415 		char name[12];	/* enough for a decimal integer */
416 		int instance = -1;
417 		dev_info_t *child = (dev_info_t *)arg;
418 		const char *childname = ddi_driver_name(child);
419 		char **childlist;
420 		uint_t nelems;
421 		int auto_assign = 0;
422 
423 		/*
424 		 * If this pseudonex node has a valid-children property,
425 		 * then that acts as an access control list for children
426 		 * allowed to attach beneath this node.  Honor it.
427 		 */
428 		if (ddi_prop_lookup_string_array(DDI_DEV_T_ANY, dip,
429 		    DDI_PROP_DONTPASS, "valid-children", &childlist,
430 		    &nelems) == DDI_PROP_SUCCESS) {
431 			int i, ok = 0;
432 			for (i = 0; i < nelems; i++) {
433 				if (strcmp(childlist[i], childname) == 0) {
434 					ok = 1;
435 					break;
436 				}
437 			}
438 			ddi_prop_free(childlist);
439 			if (!ok)
440 				return (DDI_FAILURE);
441 		}
442 
443 		/*
444 		 * Look up the "instance" property. If it does not exist,
445 		 * check to see if the "auto-assign-instance" property is set.
446 		 * If not, default to using instance 0; while not ideal, this
447 		 * is a legacy behavior we must continue to support.
448 		 */
449 		instance = ddi_prop_get_int(DDI_DEV_T_ANY, child,
450 		    DDI_PROP_DONTPASS, "instance", -1);
451 		auto_assign = ddi_prop_exists(DDI_DEV_T_ANY, child,
452 		    DDI_PROP_DONTPASS, "auto-assign-instance");
453 		NDI_CONFIG_DEBUG((CE_NOTE,
454 		    "pseudonex: DDI_CTLOPS_INITCHILD(instance=%d, "
455 		    "auto-assign=%d)", instance, auto_assign));
456 
457 		if (instance != -1 && auto_assign != 0) {
458 			NDI_CONFIG_DEBUG((CE_NOTE, "both instance and "
459 			    "auto-assign-instance properties specified. "
460 			    "Node rejected."));
461 			return (DDI_FAILURE);
462 		}
463 
464 		if (instance == -1 && auto_assign == 0) {
465 			/* default to instance 0 if not specified */
466 			NDI_CONFIG_DEBUG((CE_NOTE, "defaulting to 0"));
467 			instance = 0;
468 		}
469 
470 		/*
471 		 * If an instance has been specified, determine if this
472 		 * instance is already in use; if we need to pick an instance,
473 		 * we do it here.
474 		 */
475 		if (auto_assign) {
476 			if ((instance = pseudonex_auto_assign(child)) == -1) {
477 				NDI_CONFIG_DEBUG((CE_NOTE, "failed to "
478 				    "auto-select instance for %s", childname));
479 				return (DDI_FAILURE);
480 			}
481 			NDI_CONFIG_DEBUG((CE_NOTE,
482 			    "auto-selected instance for %s: %d",
483 			    childname, instance));
484 		} else {
485 			if (pseudonex_check_assignment(child, instance) ==
486 			    DDI_FAILURE) {
487 				NDI_CONFIG_DEBUG((CE_WARN,
488 				    "Duplicate instance %d of node \"%s\" "
489 				    "ignored.", instance, childname));
490 				return (DDI_FAILURE);
491 			}
492 			NDI_CONFIG_DEBUG((CE_NOTE,
493 			    "using fixed-assignment instance for %s: %d",
494 			    childname, instance));
495 		}
496 
497 		/*
498 		 * Attach the instance number to the node. This allows
499 		 * us to have multiple instances of the same pseudo
500 		 * device, they will be named 'device@instance'. If this
501 		 * breaks programs, we may need to special-case instance 0
502 		 * into 'device'. Ick. devlinks appears to handle the
503 		 * new names ok, so if only names in /dev are used
504 		 * this may not be necessary.
505 		 */
506 		(void) snprintf(name, sizeof (name), "%d", instance);
507 		DEVI(child)->devi_instance = instance;
508 		ddi_set_name_addr(child, name);
509 		return (DDI_SUCCESS);
510 	}
511 
512 	case DDI_CTLOPS_UNINITCHILD:
513 	{
514 		dev_info_t *child = (dev_info_t *)arg;
515 
516 		NDI_CONFIG_DEBUG((CE_NOTE,
517 		    "DDI_CTLOPS_UNINITCHILD(%s, instance=%d)",
518 		    ddi_driver_name(child), DEVI(child)->devi_instance));
519 
520 		ddi_set_name_addr(child, NULL);
521 
522 		return (DDI_SUCCESS);
523 	}
524 
525 	case DDI_CTLOPS_DMAPMAPC:
526 	case DDI_CTLOPS_REPORTINT:
527 	case DDI_CTLOPS_REGSIZE:
528 	case DDI_CTLOPS_NREGS:
529 	case DDI_CTLOPS_SIDDEV:
530 	case DDI_CTLOPS_SLAVEONLY:
531 	case DDI_CTLOPS_AFFINITY:
532 	case DDI_CTLOPS_POKE:
533 	case DDI_CTLOPS_PEEK:
534 		/*
535 		 * These ops correspond to functions that "shouldn't" be called
536 		 * by a pseudo driver.  So we whine when we're called.
537 		 */
538 		cmn_err(CE_CONT, "%s%d: invalid op (%d) from %s%d\n",
539 		    ddi_driver_name(dip), ddi_get_instance(dip), ctlop,
540 		    ddi_driver_name(rdip), ddi_get_instance(rdip));
541 		return (DDI_FAILURE);
542 
543 	case DDI_CTLOPS_ATTACH:
544 	case DDI_CTLOPS_BTOP:
545 	case DDI_CTLOPS_BTOPR:
546 	case DDI_CTLOPS_DETACH:
547 	case DDI_CTLOPS_DVMAPAGESIZE:
548 	case DDI_CTLOPS_IOMIN:
549 	case DDI_CTLOPS_POWER:
550 	case DDI_CTLOPS_PTOB:
551 	default:
552 		/*
553 		 * The ops that we pass up (default).  We pass up memory
554 		 * allocation oriented ops that we receive - these may be
555 		 * associated with pseudo HBA drivers below us with target
556 		 * drivers below them that use ddi memory allocation
557 		 * interfaces like scsi_alloc_consistent_buf.
558 		 */
559 		return (ddi_ctlops(dip, rdip, ctlop, arg, result));
560 	}
561 }
562