summaryrefslogtreecommitdiff
path: root/drivers/infiniband/hw/mthca/mthca_memfree.c
blob: 637b30e355928756be4ea01c160bed02f5c346aa (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
/*
 * Copyright (c) 2004, 2005 Topspin Communications.  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.
 *
 * $Id$
 */

#include <linux/mm.h>

#include "mthca_memfree.h"
#include "mthca_dev.h"
#include "mthca_cmd.h"

/*
 * We allocate in as big chunks as we can, up to a maximum of 256 KB
 * per chunk.
 */
enum {
	MTHCA_ICM_ALLOC_SIZE   = 1 << 18,
	MTHCA_TABLE_CHUNK_SIZE = 1 << 18
};

void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm)
{
	struct mthca_icm_chunk *chunk, *tmp;
	int i;

	if (!icm)
		return;

	list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
		if (chunk->nsg > 0)
			pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
				     PCI_DMA_BIDIRECTIONAL);

		for (i = 0; i < chunk->npages; ++i)
			__free_pages(chunk->mem[i].page,
				     get_order(chunk->mem[i].length));

		kfree(chunk);
	}

	kfree(icm);
}

struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
				  unsigned int gfp_mask)
{
	struct mthca_icm *icm;
	struct mthca_icm_chunk *chunk = NULL;
	int cur_order;

	icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
	if (!icm)
		return icm;

	icm->refcount = 0;
	INIT_LIST_HEAD(&icm->chunk_list);

	cur_order = get_order(MTHCA_ICM_ALLOC_SIZE);

	while (npages > 0) {
		if (!chunk) {
			chunk = kmalloc(sizeof *chunk,
					gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
			if (!chunk)
				goto fail;

			chunk->npages = 0;
			chunk->nsg    = 0;
			list_add_tail(&chunk->list, &icm->chunk_list);
		}

		while (1 << cur_order > npages)
			--cur_order;

		chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order);
		if (chunk->mem[chunk->npages].page) {
			chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order;
			chunk->mem[chunk->npages].offset = 0;

			if (++chunk->npages == MTHCA_ICM_CHUNK_LEN) {
				chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
							chunk->npages,
							PCI_DMA_BIDIRECTIONAL);

				if (chunk->nsg <= 0)
					goto fail;

				chunk = NULL;
			}

			npages -= 1 << cur_order;
		} else {
			--cur_order;
			if (cur_order < 0)
				goto fail;
		}
	}

	if (chunk) {
		chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
					chunk->npages,
					PCI_DMA_BIDIRECTIONAL);

		if (chunk->nsg <= 0)
			goto fail;
	}

	return icm;

fail:
	mthca_free_icm(dev, icm);
	return NULL;
}

int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
{
	int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
	int ret = 0;
	u8 status;

	down(&table->mutex);

	if (table->icm[i]) {
		++table->icm[i]->refcount;
		goto out;
	}

	table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
					(table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
					__GFP_NOWARN);
	if (!table->icm[i]) {
		ret = -ENOMEM;
		goto out;
	}

	if (mthca_MAP_ICM(dev, table->icm[i], table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
			  &status) || status) {
		mthca_free_icm(dev, table->icm[i]);
		table->icm[i] = NULL;
		ret = -ENOMEM;
		goto out;
	}

	++table->icm[i]->refcount;

out:
	up(&table->mutex);
	return ret;
}

void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
{
	int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
	u8 status;

	down(&table->mutex);

	if (--table->icm[i]->refcount == 0) {
		mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
				MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
		mthca_free_icm(dev, table->icm[i]);
		table->icm[i] = NULL;
	}

	up(&table->mutex);
}

void *mthca_table_find(struct mthca_icm_table *table, int obj)
{
	int idx, offset, i;
	struct mthca_icm_chunk *chunk;
	struct mthca_icm *icm;
	struct page *page = NULL;

	if (!table->lowmem)
		return NULL;

	down(&table->mutex);

	idx = (obj & (table->num_obj - 1)) * table->obj_size;
	icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
	offset = idx % MTHCA_TABLE_CHUNK_SIZE;

	if (!icm)
		goto out;

	list_for_each_entry(chunk, &icm->chunk_list, list) {
		for (i = 0; i < chunk->npages; ++i) {
			if (chunk->mem[i].length >= offset) {
				page = chunk->mem[i].page;
				break;
			}
			offset -= chunk->mem[i].length;
		}
	}

out:
	up(&table->mutex);
	return page ? lowmem_page_address(page) + offset : NULL;
}

int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
			  int start, int end)
{
	int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size;
	int i, err;

	for (i = start; i <= end; i += inc) {
		err = mthca_table_get(dev, table, i);
		if (err)
			goto fail;
	}

	return 0;

fail:
	while (i > start) {
		i -= inc;
		mthca_table_put(dev, table, i);
	}

	return err;
}

void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
			   int start, int end)
{
	int i;

	for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size)
		mthca_table_put(dev, table, i);
}

struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
					      u64 virt, int obj_size,
					      int nobj, int reserved,
					      int use_lowmem)
{
	struct mthca_icm_table *table;
	int num_icm;
	int i;
	u8 status;

	num_icm = obj_size * nobj / MTHCA_TABLE_CHUNK_SIZE;

	table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL);
	if (!table)
		return NULL;

	table->virt     = virt;
	table->num_icm  = num_icm;
	table->num_obj  = nobj;
	table->obj_size = obj_size;
	table->lowmem   = use_lowmem;
	init_MUTEX(&table->mutex);

	for (i = 0; i < num_icm; ++i)
		table->icm[i] = NULL;

	for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
		table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
						(use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
						__GFP_NOWARN);
		if (!table->icm[i])
			goto err;
		if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE,
				  &status) || status) {
			mthca_free_icm(dev, table->icm[i]);
			table->icm[i] = NULL;
			goto err;
		}

		/*
		 * Add a reference to this ICM chunk so that it never
		 * gets freed (since it contains reserved firmware objects).
		 */
		++table->icm[i]->refcount;
	}

	return table;

err:
	for (i = 0; i < num_icm; ++i)
		if (table->icm[i]) {
			mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE,
					MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
			mthca_free_icm(dev, table->icm[i]);
		}

	kfree(table);

	return NULL;
}

void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table)
{
	int i;
	u8 status;

	for (i = 0; i < table->num_icm; ++i)
		if (table->icm[i]) {
			mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
					MTHCA_TABLE_CHUNK_SIZE >> 12, &status);
			mthca_free_icm(dev, table->icm[i]);
		}

	kfree(table);
}

static u64 mthca_uarc_virt(struct mthca_dev *dev, int page)
{
	return dev->uar_table.uarc_base +
		dev->driver_uar.index * dev->uar_table.uarc_size +
		page * 4096;
}

int mthca_alloc_db(struct mthca_dev *dev, int type, u32 qn, u32 **db)
{
	int group;
	int start, end, dir;
	int i, j;
	struct mthca_db_page *page;
	int ret = 0;
	u8 status;

	down(&dev->db_tab->mutex);

	switch (type) {
	case MTHCA_DB_TYPE_CQ_ARM:
	case MTHCA_DB_TYPE_SQ:
		group = 0;
		start = 0;
		end   = dev->db_tab->max_group1;
		dir   = 1;
		break;

	case MTHCA_DB_TYPE_CQ_SET_CI:
	case MTHCA_DB_TYPE_RQ:
	case MTHCA_DB_TYPE_SRQ:
		group = 1;
		start = dev->db_tab->npages - 1;
		end   = dev->db_tab->min_group2;
		dir   = -1;
		break;

	default:
		ret = -EINVAL;
		goto out;
	}

	for (i = start; i != end; i += dir)
		if (dev->db_tab->page[i].db_rec &&
		    !bitmap_full(dev->db_tab->page[i].used,
				 MTHCA_DB_REC_PER_PAGE)) {
			page = dev->db_tab->page + i;
			goto found;
		}

	if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) {
		ret = -ENOMEM;
		goto out;
	}

	page = dev->db_tab->page + end;
	page->db_rec = dma_alloc_coherent(&dev->pdev->dev, 4096,
					  &page->mapping, GFP_KERNEL);
	if (!page->db_rec) {
		ret = -ENOMEM;
		goto out;
	}
	memset(page->db_rec, 0, 4096);

	ret = mthca_MAP_ICM_page(dev, page->mapping, mthca_uarc_virt(dev, i), &status);
	if (!ret && status)
		ret = -EINVAL;
	if (ret) {
		dma_free_coherent(&dev->pdev->dev, 4096,
				  page->db_rec, page->mapping);
		goto out;
	}

	bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE);
	if (group == 0)
		++dev->db_tab->max_group1;
	else
		--dev->db_tab->min_group2;

found:
	j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE);
	set_bit(j, page->used);

	if (group == 1)
		j = MTHCA_DB_REC_PER_PAGE - 1 - j;

	ret = i * MTHCA_DB_REC_PER_PAGE + j;

	page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5));

	*db = (u32 *) &page->db_rec[j];

out:
	up(&dev->db_tab->mutex);

	return ret;
}

void mthca_free_db(struct mthca_dev *dev, int type, int db_index)
{
	int i, j;
	struct mthca_db_page *page;
	u8 status;

	i = db_index / MTHCA_DB_REC_PER_PAGE;
	j = db_index % MTHCA_DB_REC_PER_PAGE;

	page = dev->db_tab->page + i;

	down(&dev->db_tab->mutex);

	page->db_rec[j] = 0;
	if (i >= dev->db_tab->min_group2)
		j = MTHCA_DB_REC_PER_PAGE - 1 - j;
	clear_bit(j, page->used);

	if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) &&
	    i >= dev->db_tab->max_group1 - 1) {
		mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, i), 1, &status);

		dma_free_coherent(&dev->pdev->dev, 4096,
				  page->db_rec, page->mapping);
		page->db_rec = NULL;

		if (i == dev->db_tab->max_group1) {
			--dev->db_tab->max_group1;
			/* XXX may be able to unmap more pages now */
		}
		if (i == dev->db_tab->min_group2)
			++dev->db_tab->min_group2;
	}

	up(&dev->db_tab->mutex);
}

int mthca_init_db_tab(struct mthca_dev *dev)
{
	int i;

	if (!mthca_is_memfree(dev))
		return 0;

	dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL);
	if (!dev->db_tab)
		return -ENOMEM;

	init_MUTEX(&dev->db_tab->mutex);

	dev->db_tab->npages     = dev->uar_table.uarc_size / 4096;
	dev->db_tab->max_group1 = 0;
	dev->db_tab->min_group2 = dev->db_tab->npages - 1;

	dev->db_tab->page = kmalloc(dev->db_tab->npages *
				    sizeof *dev->db_tab->page,
				    GFP_KERNEL);
	if (!dev->db_tab->page) {
		kfree(dev->db_tab);
		return -ENOMEM;
	}

	for (i = 0; i < dev->db_tab->npages; ++i)
		dev->db_tab->page[i].db_rec = NULL;

	return 0;
}

void mthca_cleanup_db_tab(struct mthca_dev *dev)
{
	int i;
	u8 status;

	if (!mthca_is_memfree(dev))
		return;

	/*
	 * Because we don't always free our UARC pages when they
	 * become empty to make mthca_free_db() simpler we need to
	 * make a sweep through the doorbell pages and free any
	 * leftover pages now.
	 */
	for (i = 0; i < dev->db_tab->npages; ++i) {
		if (!dev->db_tab->page[i].db_rec)
			continue;

		if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE))
			mthca_warn(dev, "Kernel UARC page %d not empty\n", i);

		mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, i), 1, &status);

		dma_free_coherent(&dev->pdev->dev, 4096,
				  dev->db_tab->page[i].db_rec,
				  dev->db_tab->page[i].mapping);
	}

	kfree(dev->db_tab->page);
	kfree(dev->db_tab);
}