aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/ipath/ipath_diag.c
blob: d4ce8b63e19eba275cc2e11235dc751ed438e1f1 (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
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
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
/*
 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * This file contains support for diagnostic functions.  It is accessed by
 * opening the ipath_diag device, normally minor number 129.  Diagnostic use
 * of the InfiniPath chip may render the chip or board unusable until the
 * driver is unloaded, or in some cases, until the system is rebooted.
 *
 * Accesses to the chip through this interface are not similar to going
 * through the /sys/bus/pci resource mmap interface.
 */

#include <linux/io.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <asm/uaccess.h>

#include "ipath_kernel.h"
#include "ipath_common.h"

int ipath_diag_inuse;
static int diag_set_link;

static int ipath_diag_open(struct inode *in, struct file *fp);
static int ipath_diag_release(struct inode *in, struct file *fp);
static ssize_t ipath_diag_read(struct file *fp, char __user *data,
			       size_t count, loff_t *off);
static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
				size_t count, loff_t *off);

static const struct file_operations diag_file_ops = {
	.owner = THIS_MODULE,
	.write = ipath_diag_write,
	.read = ipath_diag_read,
	.open = ipath_diag_open,
	.release = ipath_diag_release
};

static ssize_t ipath_diagpkt_write(struct file *fp,
				   const char __user *data,
				   size_t count, loff_t *off);

static const struct file_operations diagpkt_file_ops = {
	.owner = THIS_MODULE,
	.write = ipath_diagpkt_write,
};

static atomic_t diagpkt_count = ATOMIC_INIT(0);
static struct cdev *diagpkt_cdev;
static struct device *diagpkt_dev;

int ipath_diag_add(struct ipath_devdata *dd)
{
	char name[16];
	int ret = 0;

	if (atomic_inc_return(&diagpkt_count) == 1) {
		ret = ipath_cdev_init(IPATH_DIAGPKT_MINOR,
				      "ipath_diagpkt", &diagpkt_file_ops,
				      &diagpkt_cdev, &diagpkt_dev);

		if (ret) {
			ipath_dev_err(dd, "Couldn't create ipath_diagpkt "
				      "device: %d", ret);
			goto done;
		}
	}

	snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);

	ret = ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
			      &diag_file_ops, &dd->diag_cdev,
			      &dd->diag_dev);
	if (ret)
		ipath_dev_err(dd, "Couldn't create %s device: %d",
			      name, ret);

done:
	return ret;
}

void ipath_diag_remove(struct ipath_devdata *dd)
{
	if (atomic_dec_and_test(&diagpkt_count))
		ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_dev);

	ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_dev);
}

/**
 * ipath_read_umem64 - read a 64-bit quantity from the chip into user space
 * @dd: the infinipath device
 * @uaddr: the location to store the data in user memory
 * @caddr: the source chip address (full pointer, not offset)
 * @count: number of bytes to copy (multiple of 32 bits)
 *
 * This function also localizes all chip memory accesses.
 * The copy should be written such that we read full cacheline packets
 * from the chip.  This is usually used for a single qword
 *
 * NOTE:  This assumes the chip address is 64-bit aligned.
 */
static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
			     const void __iomem *caddr, size_t count)
{
	const u64 __iomem *reg_addr = caddr;
	const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
	int ret;

	/* not very efficient, but it works for now */
	if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
		ret = -EINVAL;
		goto bail;
	}
	while (reg_addr < reg_end) {
		u64 data = readq(reg_addr);
		if (copy_to_user(uaddr, &data, sizeof(u64))) {
			ret = -EFAULT;
			goto bail;
		}
		reg_addr++;
		uaddr += sizeof(u64);
	}
	ret = 0;
bail:
	return ret;
}

/**
 * ipath_write_umem64 - write a 64-bit quantity to the chip from user space
 * @dd: the infinipath device
 * @caddr: the destination chip address (full pointer, not offset)
 * @uaddr: the source of the data in user memory
 * @count: the number of bytes to copy (multiple of 32 bits)
 *
 * This is usually used for a single qword
 * NOTE:  This assumes the chip address is 64-bit aligned.
 */

static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
			      const void __user *uaddr, size_t count)
{
	u64 __iomem *reg_addr = caddr;
	const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
	int ret;

	/* not very efficient, but it works for now */
	if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
		ret = -EINVAL;
		goto bail;
	}
	while (reg_addr < reg_end) {
		u64 data;
		if (copy_from_user(&data, uaddr, sizeof(data))) {
			ret = -EFAULT;
			goto bail;
		}
		writeq(data, reg_addr);

		reg_addr++;
		uaddr += sizeof(u64);
	}
	ret = 0;
bail:
	return ret;
}

/**
 * ipath_read_umem32 - read a 32-bit quantity from the chip into user space
 * @dd: the infinipath device
 * @uaddr: the location to store the data in user memory
 * @caddr: the source chip address (full pointer, not offset)
 * @count: number of bytes to copy
 *
 * read 32 bit values, not 64 bit; for memories that only
 * support 32 bit reads; usually a single dword.
 */
static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr,
			     const void __iomem *caddr, size_t count)
{
	const u32 __iomem *reg_addr = caddr;
	const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
	int ret;

	if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
	    reg_end > (u32 __iomem *) dd->ipath_kregend) {
		ret = -EINVAL;
		goto bail;
	}
	/* not very efficient, but it works for now */
	while (reg_addr < reg_end) {
		u32 data = readl(reg_addr);
		if (copy_to_user(uaddr, &data, sizeof(data))) {
			ret = -EFAULT;
			goto bail;
		}

		reg_addr++;
		uaddr += sizeof(u32);

	}
	ret = 0;
bail:
	return ret;
}

/**
 * ipath_write_umem32 - write a 32-bit quantity to the chip from user space
 * @dd: the infinipath device
 * @caddr: the destination chip address (full pointer, not offset)
 * @uaddr: the source of the data in user memory
 * @count: number of bytes to copy
 *
 * write 32 bit values, not 64 bit; for memories that only
 * support 32 bit write; usually a single dword.
 */

static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
			      const void __user *uaddr, size_t count)
{
	u32 __iomem *reg_addr = caddr;
	const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
	int ret;

	if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
	    reg_end > (u32 __iomem *) dd->ipath_kregend) {
		ret = -EINVAL;
		goto bail;
	}
	while (reg_addr < reg_end) {
		u32 data;
		if (copy_from_user(&data, uaddr, sizeof(data))) {
			ret = -EFAULT;
			goto bail;
		}
		writel(data, reg_addr);

		reg_addr++;
		uaddr += sizeof(u32);
	}
	ret = 0;
bail:
	return ret;
}

static int ipath_diag_open(struct inode *in, struct file *fp)
{
	int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
	struct ipath_devdata *dd;
	int ret;

	mutex_lock(&ipath_mutex);

	if (ipath_diag_inuse) {
		ret = -EBUSY;
		goto bail;
	}

	dd = ipath_lookup(unit);

	if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
	    !dd->ipath_kregbase) {
		ret = -ENODEV;
		goto bail;
	}

	fp->private_data = dd;
	ipath_diag_inuse = -2;
	diag_set_link = 0;
	ret = 0;

	/* Only expose a way to reset the device if we
	   make it into diag mode. */
	ipath_expose_reset(&dd->pcidev->dev);

bail:
	mutex_unlock(&ipath_mutex);

	return ret;
}

/**
 * ipath_diagpkt_write - write an IB packet
 * @fp: the diag data device file pointer
 * @data: ipath_diag_pkt structure saying where to get the packet
 * @count: size of data to write
 * @off: unused by this code
 */
static ssize_t ipath_diagpkt_write(struct file *fp,
				   const char __user *data,
				   size_t count, loff_t *off)
{
	u32 __iomem *piobuf;
	u32 plen, clen, pbufn;
	struct ipath_diag_pkt odp;
	struct ipath_diag_xpkt dp;
	u32 *tmpbuf = NULL;
	struct ipath_devdata *dd;
	ssize_t ret = 0;
	u64 val;
	u32 l_state, lt_state; /* LinkState, LinkTrainingState */

	if (count < sizeof(odp)) {
		ret = -EINVAL;
		goto bail;
	}

	if (count == sizeof(dp)) {
		if (copy_from_user(&dp, data, sizeof(dp))) {
			ret = -EFAULT;
			goto bail;
		}
	} else if (copy_from_user(&odp, data, sizeof(odp))) {
		ret = -EFAULT;
		goto bail;
	}

	/*
	 * Due to padding/alignment issues (lessened with new struct)
	 * the old and new structs are the same length. We need to
	 * disambiguate them, which we can do because odp.len has never
	 * been less than the total of LRH+BTH+DETH so far, while
	 * dp.unit (same offset) unit is unlikely to get that high.
	 * Similarly, dp.data, the pointer to user at the same offset
	 * as odp.unit, is almost certainly at least one (512byte)page
	 * "above" NULL. The if-block below can be omitted if compatibility
	 * between a new driver and older diagnostic code is unimportant.
	 * compatibility the other direction (new diags, old driver) is
	 * handled in the diagnostic code, with a warning.
	 */
	if (dp.unit >= 20 && dp.data < 512) {
		/* very probable version mismatch. Fix it up */
		memcpy(&odp, &dp, sizeof(odp));
		/* We got a legacy dp, copy elements to dp */
		dp.unit = odp.unit;
		dp.data = odp.data;
		dp.len = odp.len;
		dp.pbc_wd = 0; /* Indicate we need to compute PBC wd */
	}

	/* send count must be an exact number of dwords */
	if (dp.len & 3) {
		ret = -EINVAL;
		goto bail;
	}

	clen = dp.len >> 2;

	dd = ipath_lookup(dp.unit);
	if (!dd || !(dd->ipath_flags & IPATH_PRESENT) ||
	    !dd->ipath_kregbase) {
		ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n",
			   dp.unit);
		ret = -ENODEV;
		goto bail;
	}

	if (ipath_diag_inuse && !diag_set_link &&
	    !(dd->ipath_flags & IPATH_LINKACTIVE)) {
		diag_set_link = 1;
		ipath_cdbg(VERBOSE, "Trying to set to set link active for "
			   "diag pkt\n");
		ipath_set_linkstate(dd, IPATH_IB_LINKARM);
		ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE);
	}

	if (!(dd->ipath_flags & IPATH_INITTED)) {
		/* no hardware, freeze, etc. */
		ipath_cdbg(VERBOSE, "unit %u not usable\n", dd->ipath_unit);
		ret = -ENODEV;
		goto bail;
	}
	/*
	 * Want to skip check for l_state if using custom PBC,
	 * because we might be trying to force an SM packet out.
	 * first-cut, skip _all_ state checking in that case.
	 */
	val = ipath_ib_state(dd, dd->ipath_lastibcstat);
	lt_state = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat);
	l_state = ipath_ib_linkstate(dd, dd->ipath_lastibcstat);
	if (!dp.pbc_wd && (lt_state != INFINIPATH_IBCS_LT_STATE_LINKUP ||
	    (val != dd->ib_init && val != dd->ib_arm &&
	    val != dd->ib_active))) {
		ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n",
			   dd->ipath_unit, (unsigned long long) val);
		ret = -EINVAL;
		goto bail;
	}

	/* need total length before first word written */
	/* +1 word is for the qword padding */
	plen = sizeof(u32) + dp.len;

	if ((plen + 4) > dd->ipath_ibmaxlen) {
		ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n",
			  plen - 4, dd->ipath_ibmaxlen);
		ret = -EINVAL;
		goto bail;	/* before writing pbc */
	}
	tmpbuf = vmalloc(plen);
	if (!tmpbuf) {
		dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, "
			 "failing\n");
		ret = -ENOMEM;
		goto bail;
	}

	if (copy_from_user(tmpbuf,
			   (const void __user *) (unsigned long) dp.data,
			   dp.len)) {
		ret = -EFAULT;
		goto bail;
	}

	plen >>= 2;		/* in dwords */

	piobuf = ipath_getpiobuf(dd, plen, &pbufn);
	if (!piobuf) {
		ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n",
			   dd->ipath_unit);
		ret = -EBUSY;
		goto bail;
	}
	/* disarm it just to be extra sure */
	ipath_disarm_piobufs(dd, pbufn, 1);

	if (ipath_debug & __IPATH_PKTDBG)
		ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n",
			   dd->ipath_unit, plen - 1, pbufn);

	if (dp.pbc_wd == 0)
		dp.pbc_wd = plen;
	writeq(dp.pbc_wd, piobuf);
	/*
	 * Copy all by the trigger word, then flush, so it's written
	 * to chip before trigger word, then write trigger word, then
	 * flush again, so packet is sent.
	 */
	if (dd->ipath_flags & IPATH_PIO_FLUSH_WC) {
		ipath_flush_wc();
		__iowrite32_copy(piobuf + 2, tmpbuf, clen - 1);
		ipath_flush_wc();
		__raw_writel(tmpbuf[clen - 1], piobuf + clen + 1);
	} else
		__iowrite32_copy(piobuf + 2, tmpbuf, clen);

	ipath_flush_wc();

	ret = sizeof(dp);

bail:
	vfree(tmpbuf);
	return ret;
}

static int ipath_diag_release(struct inode *in, struct file *fp)
{
	mutex_lock(&ipath_mutex);
	ipath_diag_inuse = 0;
	fp->private_data = NULL;
	mutex_unlock(&ipath_mutex);
	return 0;
}

static ssize_t ipath_diag_read(struct file *fp, char __user *data,
			       size_t count, loff_t *off)
{
	struct ipath_devdata *dd = fp->private_data;
	void __iomem *kreg_base;
	ssize_t ret;

	kreg_base = dd->ipath_kregbase;

	if (count == 0)
		ret = 0;
	else if ((count % 4) || (*off % 4))
		/* address or length is not 32-bit aligned, hence invalid */
		ret = -EINVAL;
	else if (ipath_diag_inuse < 1 && (*off || count != 8))
		ret = -EINVAL;  /* prevent cat /dev/ipath_diag* */
	else if ((count % 8) || (*off % 8))
		/* address or length not 64-bit aligned; do 32-bit reads */
		ret = ipath_read_umem32(dd, data, kreg_base + *off, count);
	else
		ret = ipath_read_umem64(dd, data, kreg_base + *off, count);

	if (ret >= 0) {
		*off += count;
		ret = count;
		if (ipath_diag_inuse == -2)
			ipath_diag_inuse++;
	}

	return ret;
}

static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
				size_t count, loff_t *off)
{
	struct ipath_devdata *dd = fp->private_data;
	void __iomem *kreg_base;
	ssize_t ret;

	kreg_base = dd->ipath_kregbase;

	if (count == 0)
		ret = 0;
	else if ((count % 4) || (*off % 4))
		/* address or length is not 32-bit aligned, hence invalid */
		ret = -EINVAL;
	else if ((ipath_diag_inuse == -1 && (*off || count != 8)) ||
		 ipath_diag_inuse == -2)  /* read qw off 0, write qw off 0 */
		ret = -EINVAL;  /* before any other write allowed */
	else if ((count % 8) || (*off % 8))
		/* address or length not 64-bit aligned; do 32-bit writes */
		ret = ipath_write_umem32(dd, kreg_base + *off, data, count);
	else
		ret = ipath_write_umem64(dd, kreg_base + *off, data, count);

	if (ret >= 0) {
		*off += count;
		ret = count;
		if (ipath_diag_inuse == -1)
			ipath_diag_inuse = 1; /* all read/write OK now */
	}

	return ret;
}