aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/bus/pci/pci_common.c
blob: 104fdf9049119b89ce63553c95bbaec834e661de (plain)
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
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   Copyright 2013-2014 6WIND S.A.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "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 COPYRIGHT
 *   OWNER OR CONTRIBUTORS 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 <string.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/queue.h>
#include <sys/mman.h>

#include <rte_errno.h>
#include <rte_interrupts.h>
#include <rte_log.h>
#include <rte_bus.h>
#include <rte_pci.h>
#include <rte_bus_pci.h>
#include <rte_per_lcore.h>
#include <rte_memory.h>
#include <rte_eal.h>
#include <rte_string_fns.h>
#include <rte_common.h>
#include <rte_devargs.h>

#include "private.h"

extern struct rte_pci_bus rte_pci_bus;

#define SYSFS_PCI_DEVICES "/sys/bus/pci/devices"

const char *rte_pci_get_sysfs_path(void)
{
	const char *path = NULL;

	path = getenv("SYSFS_PCI_DEVICES");
	if (path == NULL)
		return SYSFS_PCI_DEVICES;

	return path;
}

static struct rte_devargs *pci_devargs_lookup(struct rte_pci_device *dev)
{
	struct rte_devargs *devargs;
	struct rte_pci_addr addr;
	struct rte_bus *pbus;

	pbus = rte_bus_find_by_name("pci");
	TAILQ_FOREACH(devargs, &devargs_list, next) {
		if (devargs->bus != pbus)
			continue;
		devargs->bus->parse(devargs->name, &addr);
		if (!rte_pci_addr_cmp(&dev->addr, &addr))
			return devargs;
	}
	return NULL;
}

void
pci_name_set(struct rte_pci_device *dev)
{
	struct rte_devargs *devargs;

	/* Each device has its internal, canonical name set. */
	rte_pci_device_name(&dev->addr,
			dev->name, sizeof(dev->name));
	devargs = pci_devargs_lookup(dev);
	dev->device.devargs = devargs;
	/* In blacklist mode, if the device is not blacklisted, no
	 * rte_devargs exists for it.
	 */
	if (devargs != NULL)
		/* If an rte_devargs exists, the generic rte_device uses the
		 * given name as its namea
		 */
		dev->device.name = dev->device.devargs->name;
	else
		/* Otherwise, it uses the internal, canonical form. */
		dev->device.name = dev->name;
}

/*
 * Match the PCI Driver and Device using the ID Table
 */
int
rte_pci_match(const struct rte_pci_driver *pci_drv,
	      const struct rte_pci_device *pci_dev)
{
	const struct rte_pci_id *id_table;

	for (id_table = pci_drv->id_table; id_table->vendor_id != 0;
	     id_table++) {
		/* check if device's identifiers match the driver's ones */
		if (id_table->vendor_id != pci_dev->id.vendor_id &&
				id_table->vendor_id != PCI_ANY_ID)
			continue;
		if (id_table->device_id != pci_dev->id.device_id &&
				id_table->device_id != PCI_ANY_ID)
			continue;
		if (id_table->subsystem_vendor_id !=
		    pci_dev->id.subsystem_vendor_id &&
		    id_table->subsystem_vendor_id != PCI_ANY_ID)
			continue;
		if (id_table->subsystem_device_id !=
		    pci_dev->id.subsystem_device_id &&
		    id_table->subsystem_device_id != PCI_ANY_ID)
			continue;
		if (id_table->class_id != pci_dev->id.class_id &&
				id_table->class_id != RTE_CLASS_ANY_ID)
			continue;

		return 1;
	}

	return 0;
}

/*
 * If vendor/device ID match, call the probe() function of the
 * driver.
 */
static int
rte_pci_probe_one_driver(struct rte_pci_driver *dr,
			 struct rte_pci_device *dev)
{
	int ret;
	struct rte_pci_addr *loc;

	if ((dr == NULL) || (dev == NULL))
		return -EINVAL;

	loc = &dev->addr;

	/* The device is not blacklisted; Check if driver supports it */
	if (!rte_pci_match(dr, dev))
		/* Match of device and driver failed */
		return 1;

	RTE_LOG(INFO, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
			loc->domain, loc->bus, loc->devid, loc->function,
			dev->device.numa_node);

	/* no initialization when blacklisted, return without error */
	if (dev->device.devargs != NULL &&
		dev->device.devargs->policy ==
			RTE_DEV_BLACKLISTED) {
		RTE_LOG(INFO, EAL, "  Device is blacklisted, not"
			" initializing\n");
		return 1;
	}

	if (dev->device.numa_node < 0) {
		RTE_LOG(WARNING, EAL, "  Invalid NUMA socket, default to 0\n");
		dev->device.numa_node = 0;
	}

	RTE_LOG(INFO, EAL, "  probe driver: %x:%x %s\n", dev->id.vendor_id,
		dev->id.device_id, dr->driver.name);

	if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) {
		/* map resources for devices that use igb_uio */
		ret = rte_pci_map_device(dev);
		if (ret != 0)
			return ret;
	}

	/* reference driver structure */
	dev->driver = dr;
	dev->device.driver = &dr->driver;

	/* call the driver probe() function */
	ret = dr->probe(dr, dev);
	if (ret) {
		dev->driver = NULL;
		dev->device.driver = NULL;
		if ((dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) &&
			/* Don't unmap if device is unsupported and
			 * driver needs mapped resources.
			 */
			!(ret > 0 &&
				(dr->drv_flags & RTE_PCI_DRV_KEEP_MAPPED_RES)))
			rte_pci_unmap_device(dev);
	}

	return ret;
}

/*
 * If vendor/device ID match, call the remove() function of the
 * driver.
 */
static int
rte_pci_detach_dev(struct rte_pci_device *dev)
{
	struct rte_pci_addr *loc;
	struct rte_pci_driver *dr;
	int ret = 0;

	if (dev == NULL)
		return -EINVAL;

	dr = dev->driver;
	loc = &dev->addr;

	RTE_LOG(DEBUG, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
			loc->domain, loc->bus, loc->devid,
			loc->function, dev->device.numa_node);

	RTE_LOG(DEBUG, EAL, "  remove driver: %x:%x %s\n", dev->id.vendor_id,
			dev->id.device_id, dr->driver.name);

	if (dr->remove) {
		ret = dr->remove(dev);
		if (ret < 0)
			return ret;
	}

	/* clear driver structure */
	dev->driver = NULL;

	if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING)
		/* unmap resources for devices that use igb_uio */
		rte_pci_unmap_device(dev);

	return 0;
}

/*
 * If vendor/device ID match, call the probe() function of all
 * registered driver for the given device. Return -1 if initialization
 * failed, return 1 if no driver is found for this device.
 */
static int
pci_probe_all_drivers(struct rte_pci_device *dev)
{
	struct rte_pci_driver *dr = NULL;
	int rc = 0;

	if (dev == NULL)
		return -1;

	/* Check if a driver is already loaded */
	if (dev->driver != NULL)
		return 0;

	FOREACH_DRIVER_ON_PCIBUS(dr) {
		rc = rte_pci_probe_one_driver(dr, dev);
		if (rc < 0)
			/* negative value is an error */
			return -1;
		if (rc > 0)
			/* positive value means driver doesn't support it */
			continue;
		return 0;
	}
	return 1;
}

/*
 * Find the pci device specified by pci address, then invoke probe function of
 * the driver of the device.
 */
int
rte_pci_probe_one(const struct rte_pci_addr *addr)
{
	struct rte_pci_device *dev = NULL;

	int ret = 0;

	if (addr == NULL)
		return -1;

	/* update current pci device in global list, kernel bindings might have
	 * changed since last time we looked at it.
	 */
	if (pci_update_device(addr) < 0)
		goto err_return;

	FOREACH_DEVICE_ON_PCIBUS(dev) {
		if (rte_pci_addr_cmp(&dev->addr, addr))
			continue;

		ret = pci_probe_all_drivers(dev);
		if (ret)
			goto err_return;
		return 0;
	}
	return -1;

err_return:
	RTE_LOG(WARNING, EAL,
		"Requested device " PCI_PRI_FMT " cannot be used\n",
		addr->domain, addr->bus, addr->devid, addr->function);
	return -1;
}

/*
 * Detach device specified by its pci address.
 */
int
rte_pci_detach(const struct rte_pci_addr *addr)
{
	struct rte_pci_device *dev = NULL;
	int ret = 0;

	if (addr == NULL)
		return -1;

	FOREACH_DEVICE_ON_PCIBUS(dev) {
		if (rte_pci_addr_cmp(&dev->addr, addr))
			continue;

		ret = rte_pci_detach_dev(dev);
		if (ret < 0)
			/* negative value is an error */
			goto err_return;
		if (ret > 0)
			/* positive value means driver doesn't support it */
			continue;

		rte_pci_remove_device(dev);
		free(dev);
		return 0;
	}
	return -1;

err_return:
	RTE_LOG(WARNING, EAL, "Requested device " PCI_PRI_FMT
			" cannot be used\n", dev->addr.domain, dev->addr.bus,
			dev->addr.devid, dev->addr.function);
	return -1;
}

/*
 * Scan the content of the PCI bus, and call the probe() function for
 * all registered drivers that have a matching entry in its id_table
 * for discovered devices.
 */
int
rte_pci_probe(void)
{
	struct rte_pci_device *dev = NULL;
	size_t probed = 0, failed = 0;
	struct rte_devargs *devargs;
	int probe_all = 0;
	int ret = 0;

	if (rte_pci_bus.bus.conf.scan_mode != RTE_BUS_SCAN_WHITELIST)
		probe_all = 1;

	FOREACH_DEVICE_ON_PCIBUS(dev) {
		probed++;

		devargs = dev->device.devargs;
		/* probe all or only whitelisted devices */
		if (probe_all)
			ret = pci_probe_all_drivers(dev);
		else if (devargs != NULL &&
			devargs->policy == RTE_DEV_WHITELISTED)
			ret = pci_probe_all_drivers(dev);
		if (ret < 0) {
			RTE_LOG(ERR, EAL, "Requested device " PCI_PRI_FMT
				 " cannot be used\n", dev->addr.domain, dev->addr.bus,
				 dev->addr.devid, dev->addr.function);
			rte_errno = errno;
			failed++;
			ret = 0;
		}
	}

	return (probed && probed == failed) ? -1 : 0;
}

/* dump one device */
static int
pci_dump_one_device(FILE *f, struct rte_pci_device *dev)
{
	int i;

	fprintf(f, PCI_PRI_FMT, dev->addr.domain, dev->addr.bus,
	       dev->addr.devid, dev->addr.function);
	fprintf(f, " - vendor:%x device:%x\n", dev->id.vendor_id,
	       dev->id.device_id);

	for (i = 0; i != sizeof(dev->mem_resource) /
		sizeof(dev->mem_resource[0]); i++) {
		fprintf(f, "   %16.16"PRIx64" %16.16"PRIx64"\n",
			dev->mem_resource[i].phys_addr,
			dev->mem_resource[i].len);
	}
	return 0;
}

/* dump devices on the bus */
void
rte_pci_dump(FILE *f)
{
	struct rte_pci_device *dev = NULL;

	FOREACH_DEVICE_ON_PCIBUS(dev) {
		pci_dump_one_device(f, dev);
	}
}

static int
pci_parse(const char *name, void *addr)
{
	struct rte_pci_addr *out = addr;
	struct rte_pci_addr pci_addr;
	bool parse;

	parse = (rte_pci_addr_parse(name, &pci_addr) == 0);
	if (parse && addr != NULL)
		*out = pci_addr;
	return parse == false;
}

/* register a driver */
void
rte_pci_register(struct rte_pci_driver *driver)
{
	TAILQ_INSERT_TAIL(&rte_pci_bus.driver_list, driver, next);
	driver->bus = &rte_pci_bus;
}

/* unregister a driver */
void
rte_pci_unregister(struct rte_pci_driver *driver)
{
	TAILQ_REMOVE(&rte_pci_bus.driver_list, driver, next);
	driver->bus = NULL;
}

/* Add a device to PCI bus */
void
rte_pci_add_device(struct rte_pci_device *pci_dev)
{
	TAILQ_INSERT_TAIL(&rte_pci_bus.device_list, pci_dev, next);
}

/* Insert a device into a predefined position in PCI bus */
void
rte_pci_insert_device(struct rte_pci_device *exist_pci_dev,
		      struct rte_pci_device *new_pci_dev)
{
	TAILQ_INSERT_BEFORE(exist_pci_dev, new_pci_dev, next);
}

/* Remove a device from PCI bus */
void
rte_pci_remove_device(struct rte_pci_device *pci_dev)
{
	TAILQ_REMOVE(&rte_pci_bus.device_list, pci_dev, next);
}

static struct rte_device *
pci_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
		const void *data)
{
	struct rte_pci_device *dev;

	FOREACH_DEVICE_ON_PCIBUS(dev) {
		if (start && &dev->device == start) {
			start = NULL; /* starting point found */
			continue;
		}
		if (cmp(&dev->device, data) == 0)
			return &dev->device;
	}

	return NULL;
}

static int
pci_plug(struct rte_device *dev)
{
	return pci_probe_all_drivers(RTE_DEV_TO_PCI(dev));
}

static int
pci_unplug(struct rte_device *dev)
{
	struct rte_pci_device *pdev;
	int ret;

	pdev = RTE_DEV_TO_PCI(dev);
	ret = rte_pci_detach_dev(pdev);
	if (ret == 0) {
		rte_pci_remove_device(pdev);
		free(pdev);
	}
	return ret;
}

struct rte_pci_bus rte_pci_bus = {
	.bus = {
		.scan = rte_pci_scan,
		.probe = rte_pci_probe,
		.find_device = pci_find_device,
		.plug = pci_plug,
		.unplug = pci_unplug,
		.parse = pci_parse,
		.get_iommu_class = rte_pci_get_iommu_class,
	},
	.device_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.device_list),
	.driver_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.driver_list),
};

RTE_REGISTER_BUS(pci, rte_pci_bus.bus);