aboutsummaryrefslogtreecommitdiff
path: root/sys/cam/ctl/ctl_frontend_ioctl.c
blob: 51e85087eb15a1e9adf08a1c5f7ad7e5e455877d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
/*-
 * Copyright (c) 2003-2009 Silicon Graphics International Corp.
 * Copyright (c) 2012 The FreeBSD Foundation
 * Copyright (c) 2015 Alexander Motin <mav@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/types.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/queue.h>
#include <sys/sysctl.h>

#include <cam/cam.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_da.h>
#include <cam/ctl/ctl_io.h>
#include <cam/ctl/ctl.h>
#include <cam/ctl/ctl_frontend.h>
#include <cam/ctl/ctl_util.h>
#include <cam/ctl/ctl_backend.h>
#include <cam/ctl/ctl_ioctl.h>
#include <cam/ctl/ctl_ha.h>
#include <cam/ctl/ctl_private.h>
#include <cam/ctl/ctl_debug.h>
#include <cam/ctl/ctl_error.h>

struct cfi_softc {
	uint32_t		cur_tag_num;
	struct ctl_port		port;
};

static struct cfi_softc cfi_softc;

static int cfi_init(void);
static void cfi_shutdown(void);
static void cfi_datamove(union ctl_io *io);
static void cfi_done(union ctl_io *io);

static struct ctl_frontend cfi_frontend =
{
	.name = "ioctl",
	.init = cfi_init,
	.shutdown = cfi_shutdown,
};
CTL_FRONTEND_DECLARE(ctlioctl, cfi_frontend);

static int
cfi_init(void)
{
	struct cfi_softc *isoftc = &cfi_softc;
	struct ctl_port *port;

	memset(isoftc, 0, sizeof(*isoftc));

	port = &isoftc->port;
	port->frontend = &cfi_frontend;
	port->port_type = CTL_PORT_IOCTL;
	port->num_requested_ctl_io = 100;
	port->port_name = "ioctl";
	port->fe_datamove = cfi_datamove;
	port->fe_done = cfi_done;
	port->max_targets = 1;
	port->max_target_id = 0;
	port->max_initiators = 1;

	if (ctl_port_register(port) != 0) {
		printf("%s: ioctl port registration failed\n", __func__);
		return (0);
	}
	ctl_port_online(port);
	return (0);
}

void
cfi_shutdown(void)
{
	struct cfi_softc *isoftc = &cfi_softc;
	struct ctl_port *port;

	port = &isoftc->port;
	ctl_port_offline(port);
	if (ctl_port_deregister(&isoftc->port) != 0)
		printf("%s: ctl_frontend_deregister() failed\n", __func__);
}

/*
 * Data movement routine for the CTL ioctl frontend port.
 */
static int
ctl_ioctl_do_datamove(struct ctl_scsiio *ctsio)
{
	struct ctl_sg_entry *ext_sglist, *kern_sglist;
	struct ctl_sg_entry ext_entry, kern_entry;
	int ext_sglen, ext_sg_entries, kern_sg_entries;
	int ext_sg_start, ext_offset;
	int len_to_copy, len_copied;
	int kern_watermark, ext_watermark;
	int ext_sglist_malloced;
	int i, j;

	ext_sglist_malloced = 0;
	ext_sg_start = 0;
	ext_offset = 0;

	CTL_DEBUG_PRINT(("ctl_ioctl_do_datamove\n"));

	/*
	 * If this flag is set, fake the data transfer.
	 */
	if (ctsio->io_hdr.flags & CTL_FLAG_NO_DATAMOVE) {
		ctsio->ext_data_filled = ctsio->ext_data_len;
		goto bailout;
	}

	/*
	 * To simplify things here, if we have a single buffer, stick it in
	 * a S/G entry and just make it a single entry S/G list.
	 */
	if (ctsio->io_hdr.flags & CTL_FLAG_EDPTR_SGLIST) {
		int len_seen;

		ext_sglen = ctsio->ext_sg_entries * sizeof(*ext_sglist);

		ext_sglist = (struct ctl_sg_entry *)malloc(ext_sglen, M_CTL,
							   M_WAITOK);
		ext_sglist_malloced = 1;
		if (copyin(ctsio->ext_data_ptr, ext_sglist,
				   ext_sglen) != 0) {
			ctl_set_internal_failure(ctsio,
						 /*sks_valid*/ 0,
						 /*retry_count*/ 0);
			goto bailout;
		}
		ext_sg_entries = ctsio->ext_sg_entries;
		len_seen = 0;
		for (i = 0; i < ext_sg_entries; i++) {
			if ((len_seen + ext_sglist[i].len) >=
			     ctsio->ext_data_filled) {
				ext_sg_start = i;
				ext_offset = ctsio->ext_data_filled - len_seen;
				break;
			}
			len_seen += ext_sglist[i].len;
		}
	} else {
		ext_sglist = &ext_entry;
		ext_sglist->addr = ctsio->ext_data_ptr;
		ext_sglist->len = ctsio->ext_data_len;
		ext_sg_entries = 1;
		ext_sg_start = 0;
		ext_offset = ctsio->ext_data_filled;
	}

	if (ctsio->kern_sg_entries > 0) {
		kern_sglist = (struct ctl_sg_entry *)ctsio->kern_data_ptr;
		kern_sg_entries = ctsio->kern_sg_entries;
	} else {
		kern_sglist = &kern_entry;
		kern_sglist->addr = ctsio->kern_data_ptr;
		kern_sglist->len = ctsio->kern_data_len;
		kern_sg_entries = 1;
	}


	kern_watermark = 0;
	ext_watermark = ext_offset;
	len_copied = 0;
	for (i = ext_sg_start, j = 0;
	     i < ext_sg_entries && j < kern_sg_entries;) {
		uint8_t *ext_ptr, *kern_ptr;

		len_to_copy = MIN(ext_sglist[i].len - ext_watermark,
				  kern_sglist[j].len - kern_watermark);

		ext_ptr = (uint8_t *)ext_sglist[i].addr;
		ext_ptr = ext_ptr + ext_watermark;
		if (ctsio->io_hdr.flags & CTL_FLAG_BUS_ADDR) {
			/*
			 * XXX KDM fix this!
			 */
			panic("need to implement bus address support");
#if 0
			kern_ptr = bus_to_virt(kern_sglist[j].addr);
#endif
		} else
			kern_ptr = (uint8_t *)kern_sglist[j].addr;
		kern_ptr = kern_ptr + kern_watermark;

		kern_watermark += len_to_copy;
		ext_watermark += len_to_copy;

		if ((ctsio->io_hdr.flags & CTL_FLAG_DATA_MASK) ==
		     CTL_FLAG_DATA_IN) {
			CTL_DEBUG_PRINT(("ctl_ioctl_do_datamove: copying %d "
					 "bytes to user\n", len_to_copy));
			CTL_DEBUG_PRINT(("ctl_ioctl_do_datamove: from %p "
					 "to %p\n", kern_ptr, ext_ptr));
			if (copyout(kern_ptr, ext_ptr, len_to_copy) != 0) {
				ctl_set_internal_failure(ctsio,
							 /*sks_valid*/ 0,
							 /*retry_count*/ 0);
				goto bailout;
			}
		} else {
			CTL_DEBUG_PRINT(("ctl_ioctl_do_datamove: copying %d "
					 "bytes from user\n", len_to_copy));
			CTL_DEBUG_PRINT(("ctl_ioctl_do_datamove: from %p "
					 "to %p\n", ext_ptr, kern_ptr));
			if (copyin(ext_ptr, kern_ptr, len_to_copy)!= 0){
				ctl_set_internal_failure(ctsio,
							 /*sks_valid*/ 0,
							 /*retry_count*/0);
				goto bailout;
			}
		}

		len_copied += len_to_copy;

		if (ext_sglist[i].len == ext_watermark) {
			i++;
			ext_watermark = 0;
		}

		if (kern_sglist[j].len == kern_watermark) {
			j++;
			kern_watermark = 0;
		}
	}

	ctsio->ext_data_filled += len_copied;

	CTL_DEBUG_PRINT(("ctl_ioctl_do_datamove: ext_sg_entries: %d, "
			 "kern_sg_entries: %d\n", ext_sg_entries,
			 kern_sg_entries));
	CTL_DEBUG_PRINT(("ctl_ioctl_do_datamove: ext_data_len = %d, "
			 "kern_data_len = %d\n", ctsio->ext_data_len,
			 ctsio->kern_data_len));


	/* XXX KDM set residual?? */
bailout:

	if (ext_sglist_malloced != 0)
		free(ext_sglist, M_CTL);

	return (CTL_RETVAL_COMPLETE);
}

static void
cfi_datamove(union ctl_io *io)
{
	struct ctl_fe_ioctl_params *params;

	params = (struct ctl_fe_ioctl_params *)
		io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;

	mtx_lock(&params->ioctl_mtx);
	params->state = CTL_IOCTL_DATAMOVE;
	cv_broadcast(&params->sem);
	mtx_unlock(&params->ioctl_mtx);
}

static void
cfi_done(union ctl_io *io)
{
	struct ctl_fe_ioctl_params *params;

	params = (struct ctl_fe_ioctl_params *)
		io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr;

	mtx_lock(&params->ioctl_mtx);
	params->state = CTL_IOCTL_DONE;
	cv_broadcast(&params->sem);
	mtx_unlock(&params->ioctl_mtx);
}

static int
cfi_submit_wait(union ctl_io *io)
{
	struct ctl_fe_ioctl_params params;
	ctl_fe_ioctl_state last_state;
	int done, retval;

	retval = 0;

	bzero(&params, sizeof(params));

	mtx_init(&params.ioctl_mtx, "ctliocmtx", NULL, MTX_DEF);
	cv_init(&params.sem, "ctlioccv");
	params.state = CTL_IOCTL_INPROG;
	last_state = params.state;

	io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = &params;

	CTL_DEBUG_PRINT(("cfi_submit_wait\n"));

	/* This shouldn't happen */
	if ((retval = ctl_queue(io)) != CTL_RETVAL_COMPLETE)
		return (retval);

	done = 0;

	do {
		mtx_lock(&params.ioctl_mtx);
		/*
		 * Check the state here, and don't sleep if the state has
		 * already changed (i.e. wakeup has already occured, but we
		 * weren't waiting yet).
		 */
		if (params.state == last_state) {
			/* XXX KDM cv_wait_sig instead? */
			cv_wait(&params.sem, &params.ioctl_mtx);
		}
		last_state = params.state;

		switch (params.state) {
		case CTL_IOCTL_INPROG:
			/* Why did we wake up? */
			/* XXX KDM error here? */
			mtx_unlock(&params.ioctl_mtx);
			break;
		case CTL_IOCTL_DATAMOVE:
			CTL_DEBUG_PRINT(("got CTL_IOCTL_DATAMOVE\n"));

			/*
			 * change last_state back to INPROG to avoid
			 * deadlock on subsequent data moves.
			 */
			params.state = last_state = CTL_IOCTL_INPROG;

			mtx_unlock(&params.ioctl_mtx);
			ctl_ioctl_do_datamove(&io->scsiio);
			/*
			 * Note that in some cases, most notably writes,
			 * this will queue the I/O and call us back later.
			 * In other cases, generally reads, this routine
			 * will immediately call back and wake us up,
			 * probably using our own context.
			 */
			io->scsiio.be_move_done(io);
			break;
		case CTL_IOCTL_DONE:
			mtx_unlock(&params.ioctl_mtx);
			CTL_DEBUG_PRINT(("got CTL_IOCTL_DONE\n"));
			done = 1;
			break;
		default:
			mtx_unlock(&params.ioctl_mtx);
			/* XXX KDM error here? */
			break;
		}
	} while (done == 0);

	mtx_destroy(&params.ioctl_mtx);
	cv_destroy(&params.sem);

	return (CTL_RETVAL_COMPLETE);
}

int
ctl_ioctl_io(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
    struct thread *td)
{
	union ctl_io *io;
	void *pool_tmp;
	int retval = 0;

	/*
	 * If we haven't been "enabled", don't allow any SCSI I/O
	 * to this FETD.
	 */
	if ((cfi_softc.port.status & CTL_PORT_STATUS_ONLINE) == 0)
		return (EPERM);

	io = ctl_alloc_io(cfi_softc.port.ctl_pool_ref);

	/*
	 * Need to save the pool reference so it doesn't get
	 * spammed by the user's ctl_io.
	 */
	pool_tmp = io->io_hdr.pool;
	memcpy(io, (void *)addr, sizeof(*io));
	io->io_hdr.pool = pool_tmp;

	/*
	 * No status yet, so make sure the status is set properly.
	 */
	io->io_hdr.status = CTL_STATUS_NONE;

	/*
	 * The user sets the initiator ID, target and LUN IDs.
	 */
	io->io_hdr.nexus.targ_port = cfi_softc.port.targ_port;
	io->io_hdr.flags |= CTL_FLAG_USER_REQ;
	if ((io->io_hdr.io_type == CTL_IO_SCSI) &&
	    (io->scsiio.tag_type != CTL_TAG_UNTAGGED))
		io->scsiio.tag_num = cfi_softc.cur_tag_num++;

	retval = cfi_submit_wait(io);
	if (retval == 0)
		memcpy((void *)addr, io, sizeof(*io));
	ctl_free_io(io);
	return (retval);
}