summaryrefslogtreecommitdiff
path: root/drivers/infiniband/sw/rxe/rxe_mr.c
blob: 6e8c41567ba08e13d0ca8515901e0206c8165ce6 (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
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
 */

#include "rxe.h"
#include "rxe_loc.h"

/*
 * lfsr (linear feedback shift register) with period 255
 */
static u8 rxe_get_key(void)
{
	static u32 key = 1;

	key = key << 1;

	key |= (0 != (key & 0x100)) ^ (0 != (key & 0x10))
		^ (0 != (key & 0x80)) ^ (0 != (key & 0x40));

	key &= 0xff;

	return key;
}

int mem_check_range(struct rxe_mem *mem, u64 iova, size_t length)
{
	switch (mem->type) {
	case RXE_MEM_TYPE_DMA:
		return 0;

	case RXE_MEM_TYPE_MR:
		if (iova < mem->iova ||
		    length > mem->length ||
		    iova > mem->iova + mem->length - length)
			return -EFAULT;
		return 0;

	default:
		return -EFAULT;
	}
}

#define IB_ACCESS_REMOTE	(IB_ACCESS_REMOTE_READ		\
				| IB_ACCESS_REMOTE_WRITE	\
				| IB_ACCESS_REMOTE_ATOMIC)

static void rxe_mem_init(int access, struct rxe_mem *mem)
{
	u32 lkey = mem->pelem.index << 8 | rxe_get_key();
	u32 rkey = (access & IB_ACCESS_REMOTE) ? lkey : 0;

	mem->ibmr.lkey		= lkey;
	mem->ibmr.rkey		= rkey;
	mem->state		= RXE_MEM_STATE_INVALID;
	mem->type		= RXE_MEM_TYPE_NONE;
	mem->map_shift		= ilog2(RXE_BUF_PER_MAP);
}

void rxe_mem_cleanup(struct rxe_pool_entry *arg)
{
	struct rxe_mem *mem = container_of(arg, typeof(*mem), pelem);
	int i;

	ib_umem_release(mem->umem);

	if (mem->map) {
		for (i = 0; i < mem->num_map; i++)
			kfree(mem->map[i]);

		kfree(mem->map);
	}
}

static int rxe_mem_alloc(struct rxe_mem *mem, int num_buf)
{
	int i;
	int num_map;
	struct rxe_map **map = mem->map;

	num_map = (num_buf + RXE_BUF_PER_MAP - 1) / RXE_BUF_PER_MAP;

	mem->map = kmalloc_array(num_map, sizeof(*map), GFP_KERNEL);
	if (!mem->map)
		goto err1;

	for (i = 0; i < num_map; i++) {
		mem->map[i] = kmalloc(sizeof(**map), GFP_KERNEL);
		if (!mem->map[i])
			goto err2;
	}

	BUILD_BUG_ON(!is_power_of_2(RXE_BUF_PER_MAP));

	mem->map_shift	= ilog2(RXE_BUF_PER_MAP);
	mem->map_mask	= RXE_BUF_PER_MAP - 1;

	mem->num_buf = num_buf;
	mem->num_map = num_map;
	mem->max_buf = num_map * RXE_BUF_PER_MAP;

	return 0;

err2:
	for (i--; i >= 0; i--)
		kfree(mem->map[i]);

	kfree(mem->map);
err1:
	return -ENOMEM;
}

void rxe_mem_init_dma(struct rxe_pd *pd,
		      int access, struct rxe_mem *mem)
{
	rxe_mem_init(access, mem);

	mem->ibmr.pd		= &pd->ibpd;
	mem->access		= access;
	mem->state		= RXE_MEM_STATE_VALID;
	mem->type		= RXE_MEM_TYPE_DMA;
}

int rxe_mem_init_user(struct rxe_pd *pd, u64 start,
		      u64 length, u64 iova, int access, struct ib_udata *udata,
		      struct rxe_mem *mem)
{
	struct rxe_map		**map;
	struct rxe_phys_buf	*buf = NULL;
	struct ib_umem		*umem;
	struct sg_page_iter	sg_iter;
	int			num_buf;
	void			*vaddr;
	int err;

	umem = ib_umem_get(pd->ibpd.device, start, length, access);
	if (IS_ERR(umem)) {
		pr_warn("err %d from rxe_umem_get\n",
			(int)PTR_ERR(umem));
		err = -EINVAL;
		goto err1;
	}

	mem->umem = umem;
	num_buf = ib_umem_num_pages(umem);

	rxe_mem_init(access, mem);

	err = rxe_mem_alloc(mem, num_buf);
	if (err) {
		pr_warn("err %d from rxe_mem_alloc\n", err);
		ib_umem_release(umem);
		goto err1;
	}

	mem->page_shift		= PAGE_SHIFT;
	mem->page_mask = PAGE_SIZE - 1;

	num_buf			= 0;
	map			= mem->map;
	if (length > 0) {
		buf = map[0]->buf;

		for_each_sg_page(umem->sg_head.sgl, &sg_iter, umem->nmap, 0) {
			if (num_buf >= RXE_BUF_PER_MAP) {
				map++;
				buf = map[0]->buf;
				num_buf = 0;
			}

			vaddr = page_address(sg_page_iter_page(&sg_iter));
			if (!vaddr) {
				pr_warn("null vaddr\n");
				ib_umem_release(umem);
				err = -ENOMEM;
				goto err1;
			}

			buf->addr = (uintptr_t)vaddr;
			buf->size = PAGE_SIZE;
			num_buf++;
			buf++;

		}
	}

	mem->ibmr.pd		= &pd->ibpd;
	mem->umem		= umem;
	mem->access		= access;
	mem->length		= length;
	mem->iova		= iova;
	mem->va			= start;
	mem->offset		= ib_umem_offset(umem);
	mem->state		= RXE_MEM_STATE_VALID;
	mem->type		= RXE_MEM_TYPE_MR;

	return 0;

err1:
	return err;
}

int rxe_mem_init_fast(struct rxe_pd *pd,
		      int max_pages, struct rxe_mem *mem)
{
	int err;

	rxe_mem_init(0, mem);

	/* In fastreg, we also set the rkey */
	mem->ibmr.rkey = mem->ibmr.lkey;

	err = rxe_mem_alloc(mem, max_pages);
	if (err)
		goto err1;

	mem->ibmr.pd		= &pd->ibpd;
	mem->max_buf		= max_pages;
	mem->state		= RXE_MEM_STATE_FREE;
	mem->type		= RXE_MEM_TYPE_MR;

	return 0;

err1:
	return err;
}

static void lookup_iova(
	struct rxe_mem	*mem,
	u64			iova,
	int			*m_out,
	int			*n_out,
	size_t			*offset_out)
{
	size_t			offset = iova - mem->iova + mem->offset;
	int			map_index;
	int			buf_index;
	u64			length;

	if (likely(mem->page_shift)) {
		*offset_out = offset & mem->page_mask;
		offset >>= mem->page_shift;
		*n_out = offset & mem->map_mask;
		*m_out = offset >> mem->map_shift;
	} else {
		map_index = 0;
		buf_index = 0;

		length = mem->map[map_index]->buf[buf_index].size;

		while (offset >= length) {
			offset -= length;
			buf_index++;

			if (buf_index == RXE_BUF_PER_MAP) {
				map_index++;
				buf_index = 0;
			}
			length = mem->map[map_index]->buf[buf_index].size;
		}

		*m_out = map_index;
		*n_out = buf_index;
		*offset_out = offset;
	}
}

void *iova_to_vaddr(struct rxe_mem *mem, u64 iova, int length)
{
	size_t offset;
	int m, n;
	void *addr;

	if (mem->state != RXE_MEM_STATE_VALID) {
		pr_warn("mem not in valid state\n");
		addr = NULL;
		goto out;
	}

	if (!mem->map) {
		addr = (void *)(uintptr_t)iova;
		goto out;
	}

	if (mem_check_range(mem, iova, length)) {
		pr_warn("range violation\n");
		addr = NULL;
		goto out;
	}

	lookup_iova(mem, iova, &m, &n, &offset);

	if (offset + length > mem->map[m]->buf[n].size) {
		pr_warn("crosses page boundary\n");
		addr = NULL;
		goto out;
	}

	addr = (void *)(uintptr_t)mem->map[m]->buf[n].addr + offset;

out:
	return addr;
}

/* copy data from a range (vaddr, vaddr+length-1) to or from
 * a mem object starting at iova. Compute incremental value of
 * crc32 if crcp is not zero. caller must hold a reference to mem
 */
int rxe_mem_copy(struct rxe_mem *mem, u64 iova, void *addr, int length,
		 enum copy_direction dir, u32 *crcp)
{
	int			err;
	int			bytes;
	u8			*va;
	struct rxe_map		**map;
	struct rxe_phys_buf	*buf;
	int			m;
	int			i;
	size_t			offset;
	u32			crc = crcp ? (*crcp) : 0;

	if (length == 0)
		return 0;

	if (mem->type == RXE_MEM_TYPE_DMA) {
		u8 *src, *dest;

		src  = (dir == to_mem_obj) ?
			addr : ((void *)(uintptr_t)iova);

		dest = (dir == to_mem_obj) ?
			((void *)(uintptr_t)iova) : addr;

		memcpy(dest, src, length);

		if (crcp)
			*crcp = rxe_crc32(to_rdev(mem->ibmr.device),
					*crcp, dest, length);

		return 0;
	}

	WARN_ON_ONCE(!mem->map);

	err = mem_check_range(mem, iova, length);
	if (err) {
		err = -EFAULT;
		goto err1;
	}

	lookup_iova(mem, iova, &m, &i, &offset);

	map	= mem->map + m;
	buf	= map[0]->buf + i;

	while (length > 0) {
		u8 *src, *dest;

		va	= (u8 *)(uintptr_t)buf->addr + offset;
		src  = (dir == to_mem_obj) ? addr : va;
		dest = (dir == to_mem_obj) ? va : addr;

		bytes	= buf->size - offset;

		if (bytes > length)
			bytes = length;

		memcpy(dest, src, bytes);

		if (crcp)
			crc = rxe_crc32(to_rdev(mem->ibmr.device),
					crc, dest, bytes);

		length	-= bytes;
		addr	+= bytes;

		offset	= 0;
		buf++;
		i++;

		if (i == RXE_BUF_PER_MAP) {
			i = 0;
			map++;
			buf = map[0]->buf;
		}
	}

	if (crcp)
		*crcp = crc;

	return 0;

err1:
	return err;
}

/* copy data in or out of a wqe, i.e. sg list
 * under the control of a dma descriptor
 */
int copy_data(
	struct rxe_pd		*pd,
	int			access,
	struct rxe_dma_info	*dma,
	void			*addr,
	int			length,
	enum copy_direction	dir,
	u32			*crcp)
{
	int			bytes;
	struct rxe_sge		*sge	= &dma->sge[dma->cur_sge];
	int			offset	= dma->sge_offset;
	int			resid	= dma->resid;
	struct rxe_mem		*mem	= NULL;
	u64			iova;
	int			err;

	if (length == 0)
		return 0;

	if (length > resid) {
		err = -EINVAL;
		goto err2;
	}

	if (sge->length && (offset < sge->length)) {
		mem = lookup_mem(pd, access, sge->lkey, lookup_local);
		if (!mem) {
			err = -EINVAL;
			goto err1;
		}
	}

	while (length > 0) {
		bytes = length;

		if (offset >= sge->length) {
			if (mem) {
				rxe_drop_ref(mem);
				mem = NULL;
			}
			sge++;
			dma->cur_sge++;
			offset = 0;

			if (dma->cur_sge >= dma->num_sge) {
				err = -ENOSPC;
				goto err2;
			}

			if (sge->length) {
				mem = lookup_mem(pd, access, sge->lkey,
						 lookup_local);
				if (!mem) {
					err = -EINVAL;
					goto err1;
				}
			} else {
				continue;
			}
		}

		if (bytes > sge->length - offset)
			bytes = sge->length - offset;

		if (bytes > 0) {
			iova = sge->addr + offset;

			err = rxe_mem_copy(mem, iova, addr, bytes, dir, crcp);
			if (err)
				goto err2;

			offset	+= bytes;
			resid	-= bytes;
			length	-= bytes;
			addr	+= bytes;
		}
	}

	dma->sge_offset = offset;
	dma->resid	= resid;

	if (mem)
		rxe_drop_ref(mem);

	return 0;

err2:
	if (mem)
		rxe_drop_ref(mem);
err1:
	return err;
}

int advance_dma_data(struct rxe_dma_info *dma, unsigned int length)
{
	struct rxe_sge		*sge	= &dma->sge[dma->cur_sge];
	int			offset	= dma->sge_offset;
	int			resid	= dma->resid;

	while (length) {
		unsigned int bytes;

		if (offset >= sge->length) {
			sge++;
			dma->cur_sge++;
			offset = 0;
			if (dma->cur_sge >= dma->num_sge)
				return -ENOSPC;
		}

		bytes = length;

		if (bytes > sge->length - offset)
			bytes = sge->length - offset;

		offset	+= bytes;
		resid	-= bytes;
		length	-= bytes;
	}

	dma->sge_offset = offset;
	dma->resid	= resid;

	return 0;
}

/* (1) find the mem (mr or mw) corresponding to lkey/rkey
 *     depending on lookup_type
 * (2) verify that the (qp) pd matches the mem pd
 * (3) verify that the mem can support the requested access
 * (4) verify that mem state is valid
 */
struct rxe_mem *lookup_mem(struct rxe_pd *pd, int access, u32 key,
			   enum lookup_type type)
{
	struct rxe_mem *mem;
	struct rxe_dev *rxe = to_rdev(pd->ibpd.device);
	int index = key >> 8;

	mem = rxe_pool_get_index(&rxe->mr_pool, index);
	if (!mem)
		return NULL;

	if (unlikely((type == lookup_local && mr_lkey(mem) != key) ||
		     (type == lookup_remote && mr_rkey(mem) != key) ||
		     mr_pd(mem) != pd ||
		     (access && !(access & mem->access)) ||
		     mem->state != RXE_MEM_STATE_VALID)) {
		rxe_drop_ref(mem);
		mem = NULL;
	}

	return mem;
}