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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / mellanox / mlx4 / mr.c
blob25a80d71fb2ab476df010be63a6f597f0b917319
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
4 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include <linux/init.h>
36 #include <linux/errno.h>
37 #include <linux/export.h>
38 #include <linux/slab.h>
39 #include <linux/kernel.h>
40
41 #include <linux/mlx4/cmd.h>
42
43 #include "mlx4.h"
44 #include "icm.h"
45
46 #define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28)
47 #define MLX4_MPT_FLAG_FREE (0x3UL << 28)
48 #define MLX4_MPT_FLAG_MIO (1 << 17)
49 #define MLX4_MPT_FLAG_BIND_ENABLE (1 << 15)
50 #define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
51 #define MLX4_MPT_FLAG_REGION (1 << 8)
52
53 #define MLX4_MPT_PD_FLAG_FAST_REG (1 << 27)
54 #define MLX4_MPT_PD_FLAG_RAE (1 << 28)
55 #define MLX4_MPT_PD_FLAG_EN_INV (3 << 24)
56
57 #define MLX4_MPT_STATUS_SW 0xF0
58 #define MLX4_MPT_STATUS_HW 0x00
59
60 static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
61 {
62 int o;
63 int m;
64 u32 seg;
65
66 spin_lock(&buddy->lock);
67
68 for (o = order; o <= buddy->max_order; ++o)
69 if (buddy->num_free[o]) {
70 m = 1 << (buddy->max_order - o);
71 seg = find_first_bit(buddy->bits[o], m);
72 if (seg < m)
73 goto found;
74 }
75
76 spin_unlock(&buddy->lock);
77 return -1;
78
79 found:
80 clear_bit(seg, buddy->bits[o]);
81 --buddy->num_free[o];
82
83 while (o > order) {
84 --o;
85 seg <<= 1;
86 set_bit(seg ^ 1, buddy->bits[o]);
87 ++buddy->num_free[o];
88 }
89
90 spin_unlock(&buddy->lock);
91
92 seg <<= order;
93
94 return seg;
95 }
96
97 static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
98 {
99 seg >>= order;
100
101 spin_lock(&buddy->lock);
102
103 while (test_bit(seg ^ 1, buddy->bits[order])) {
104 clear_bit(seg ^ 1, buddy->bits[order]);
105 --buddy->num_free[order];
106 seg >>= 1;
107 ++order;
108 }
109
110 set_bit(seg, buddy->bits[order]);
111 ++buddy->num_free[order];
112
113 spin_unlock(&buddy->lock);
114 }
115
116 static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
117 {
118 int i, s;
119
120 buddy->max_order = max_order;
121 spin_lock_init(&buddy->lock);
122
123 buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
124 GFP_KERNEL);
125 buddy->num_free = kcalloc((buddy->max_order + 1), sizeof *buddy->num_free,
126 GFP_KERNEL);
127 if (!buddy->bits || !buddy->num_free)
128 goto err_out;
129
130 for (i = 0; i <= buddy->max_order; ++i) {
131 s = BITS_TO_LONGS(1 << (buddy->max_order - i));
132 buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
133 if (!buddy->bits[i])
134 goto err_out_free;
135 bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
136 }
137
138 set_bit(0, buddy->bits[buddy->max_order]);
139 buddy->num_free[buddy->max_order] = 1;
140
141 return 0;
142
143 err_out_free:
144 for (i = 0; i <= buddy->max_order; ++i)
145 kfree(buddy->bits[i]);
146
147 err_out:
148 kfree(buddy->bits);
149 kfree(buddy->num_free);
150
151 return -ENOMEM;
152 }
153
154 static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
155 {
156 int i;
157
158 for (i = 0; i <= buddy->max_order; ++i)
159 kfree(buddy->bits[i]);
160
161 kfree(buddy->bits);
162 kfree(buddy->num_free);
163 }
164
165 u32 __mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
166 {
167 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
168 u32 seg;
169 int seg_order;
170 u32 offset;
171
172 seg_order = max_t(int, order - log_mtts_per_seg, 0);
173
174 seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, seg_order);
175 if (seg == -1)
176 return -1;
177
178 offset = seg * (1 << log_mtts_per_seg);
179
180 if (mlx4_table_get_range(dev, &mr_table->mtt_table, offset,
181 offset + (1 << order) - 1)) {
182 mlx4_buddy_free(&mr_table->mtt_buddy, seg, seg_order);
183 return -1;
184 }
185
186 return offset;
187 }
188
189 static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
190 {
191 u64 in_param;
192 u64 out_param;
193 int err;
194
195 if (mlx4_is_mfunc(dev)) {
196 set_param_l(&in_param, order);
197 err = mlx4_cmd_imm(dev, in_param, &out_param, RES_MTT,
198 RES_OP_RESERVE_AND_MAP,
199 MLX4_CMD_ALLOC_RES,
200 MLX4_CMD_TIME_CLASS_A,
201 MLX4_CMD_WRAPPED);
202 if (err)
203 return -1;
204 return get_param_l(&out_param);
205 }
206 return __mlx4_alloc_mtt_range(dev, order);
207 }
208
209 int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
210 struct mlx4_mtt *mtt)
211 {
212 int i;
213
214 if (!npages) {
215 mtt->order = -1;
216 mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
217 return 0;
218 } else
219 mtt->page_shift = page_shift;
220
221 for (mtt->order = 0, i = 1; i < npages; i <<= 1)
222 ++mtt->order;
223
224 mtt->offset = mlx4_alloc_mtt_range(dev, mtt->order);
225 if (mtt->offset == -1)
226 return -ENOMEM;
227
228 return 0;
229 }
230 EXPORT_SYMBOL_GPL(mlx4_mtt_init);
231
232 void __mlx4_free_mtt_range(struct mlx4_dev *dev, u32 offset, int order)
233 {
234 u32 first_seg;
235 int seg_order;
236 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
237
238 seg_order = max_t(int, order - log_mtts_per_seg, 0);
239 first_seg = offset / (1 << log_mtts_per_seg);
240
241 mlx4_buddy_free(&mr_table->mtt_buddy, first_seg, seg_order);
242 mlx4_table_put_range(dev, &mr_table->mtt_table, offset,
243 offset + (1 << order) - 1);
244 }
245
246 static void mlx4_free_mtt_range(struct mlx4_dev *dev, u32 offset, int order)
247 {
248 u64 in_param;
249 int err;
250
251 if (mlx4_is_mfunc(dev)) {
252 set_param_l(&in_param, offset);
253 set_param_h(&in_param, order);
254 err = mlx4_cmd(dev, in_param, RES_MTT, RES_OP_RESERVE_AND_MAP,
255 MLX4_CMD_FREE_RES,
256 MLX4_CMD_TIME_CLASS_A,
257 MLX4_CMD_WRAPPED);
258 if (err)
259 mlx4_warn(dev, "Failed to free mtt range at:"
260 "%d order:%d\n", offset, order);
261 return;
262 }
263 __mlx4_free_mtt_range(dev, offset, order);
264 }
265
266 void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
267 {
268 if (mtt->order < 0)
269 return;
270
271 mlx4_free_mtt_range(dev, mtt->offset, mtt->order);
272 }
273 EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
274
275 u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
276 {
277 return (u64) mtt->offset * dev->caps.mtt_entry_sz;
278 }
279 EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
280
281 static u32 hw_index_to_key(u32 ind)
282 {
283 return (ind >> 24) | (ind << 8);
284 }
285
286 static u32 key_to_hw_index(u32 key)
287 {
288 return (key << 24) | (key >> 8);
289 }
290
291 static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
292 int mpt_index)
293 {
294 return mlx4_cmd(dev, mailbox->dma, mpt_index,
295 0, MLX4_CMD_SW2HW_MPT, MLX4_CMD_TIME_CLASS_B,
296 MLX4_CMD_WRAPPED);
297 }
298
299 static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
300 int mpt_index)
301 {
302 return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
303 !mailbox, MLX4_CMD_HW2SW_MPT,
304 MLX4_CMD_TIME_CLASS_B, MLX4_CMD_WRAPPED);
305 }
306
307 int mlx4_mr_reserve_range(struct mlx4_dev *dev, int cnt, int align,
308 u32 *base_mridx)
309 {
310 struct mlx4_priv *priv = mlx4_priv(dev);
311 u32 mridx;
312
313 mridx = mlx4_bitmap_alloc_range(&priv->mr_table.mpt_bitmap, cnt, align);
314 if (mridx == -1)
315 return -ENOMEM;
316
317 *base_mridx = mridx;
318 return 0;
319
320 }
321 EXPORT_SYMBOL_GPL(mlx4_mr_reserve_range);
322
323 void mlx4_mr_release_range(struct mlx4_dev *dev, u32 base_mridx, int cnt)
324 {
325 struct mlx4_priv *priv = mlx4_priv(dev);
326 mlx4_bitmap_free_range(&priv->mr_table.mpt_bitmap, base_mridx, cnt);
327 }
328 EXPORT_SYMBOL_GPL(mlx4_mr_release_range);
329
330 int mlx4_mr_alloc_reserved(struct mlx4_dev *dev, u32 mridx, u32 pd,
331 u64 iova, u64 size, u32 access, int npages,
332 int page_shift, struct mlx4_mr *mr)
333 {
334 mr->iova = iova;
335 mr->size = size;
336 mr->pd = pd;
337 mr->access = access;
338 mr->enabled = MLX4_MR_DISABLED;
339 mr->key = hw_index_to_key(mridx);
340
341 return mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
342 }
343 EXPORT_SYMBOL_GPL(mlx4_mr_alloc_reserved);
344
345 static int mlx4_WRITE_MTT(struct mlx4_dev *dev,
346 struct mlx4_cmd_mailbox *mailbox,
347 int num_entries)
348 {
349 return mlx4_cmd(dev, mailbox->dma, num_entries, 0, MLX4_CMD_WRITE_MTT,
350 MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
351 }
352
353 int __mlx4_mr_reserve(struct mlx4_dev *dev)
354 {
355 struct mlx4_priv *priv = mlx4_priv(dev);
356
357 return mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
358 }
359
360 static int mlx4_mr_reserve(struct mlx4_dev *dev)
361 {
362 u64 out_param;
363
364 if (mlx4_is_mfunc(dev)) {
365 if (mlx4_cmd_imm(dev, 0, &out_param, RES_MPT, RES_OP_RESERVE,
366 MLX4_CMD_ALLOC_RES,
367 MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED))
368 return -1;
369 return get_param_l(&out_param);
370 }
371 return __mlx4_mr_reserve(dev);
372 }
373
374 void __mlx4_mr_release(struct mlx4_dev *dev, u32 index)
375 {
376 struct mlx4_priv *priv = mlx4_priv(dev);
377
378 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
379 }
380
381 static void mlx4_mr_release(struct mlx4_dev *dev, u32 index)
382 {
383 u64 in_param;
384
385 if (mlx4_is_mfunc(dev)) {
386 set_param_l(&in_param, index);
387 if (mlx4_cmd(dev, in_param, RES_MPT, RES_OP_RESERVE,
388 MLX4_CMD_FREE_RES,
389 MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED))
390 mlx4_warn(dev, "Failed to release mr index:%d\n",
391 index);
392 return;
393 }
394 __mlx4_mr_release(dev, index);
395 }
396
397 int __mlx4_mr_alloc_icm(struct mlx4_dev *dev, u32 index)
398 {
399 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
400
401 return mlx4_table_get(dev, &mr_table->dmpt_table, index);
402 }
403
404 static int mlx4_mr_alloc_icm(struct mlx4_dev *dev, u32 index)
405 {
406 u64 param;
407
408 if (mlx4_is_mfunc(dev)) {
409 set_param_l(&param, index);
410 return mlx4_cmd_imm(dev, param, &param, RES_MPT, RES_OP_MAP_ICM,
411 MLX4_CMD_ALLOC_RES,
412 MLX4_CMD_TIME_CLASS_A,
413 MLX4_CMD_WRAPPED);
414 }
415 return __mlx4_mr_alloc_icm(dev, index);
416 }
417
418 void __mlx4_mr_free_icm(struct mlx4_dev *dev, u32 index)
419 {
420 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
421
422 mlx4_table_put(dev, &mr_table->dmpt_table, index);
423 }
424
425 static void mlx4_mr_free_icm(struct mlx4_dev *dev, u32 index)
426 {
427 u64 in_param;
428
429 if (mlx4_is_mfunc(dev)) {
430 set_param_l(&in_param, index);
431 if (mlx4_cmd(dev, in_param, RES_MPT, RES_OP_MAP_ICM,
432 MLX4_CMD_FREE_RES, MLX4_CMD_TIME_CLASS_A,
433 MLX4_CMD_WRAPPED))
434 mlx4_warn(dev, "Failed to free icm of mr index:%d\n",
435 index);
436 return;
437 }
438 return __mlx4_mr_free_icm(dev, index);
439 }
440
441 int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
442 int npages, int page_shift, struct mlx4_mr *mr)
443 {
444 u32 index;
445 int err;
446
447 index = mlx4_mr_reserve(dev);
448 if (index == -1)
449 return -ENOMEM;
450
451 err = mlx4_mr_alloc_reserved(dev, index, pd, iova, size,
452 access, npages, page_shift, mr);
453 if (err)
454 mlx4_mr_release(dev, index);
455
456 return err;
457 }
458 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
459
460 void mlx4_mr_free_reserved(struct mlx4_dev *dev, struct mlx4_mr *mr)
461 {
462 int err;
463
464 if (mr->enabled == MLX4_MR_EN_HW) {
465 err = mlx4_HW2SW_MPT(dev, NULL,
466 key_to_hw_index(mr->key) &
467 (dev->caps.num_mpts - 1));
468 if (err)
469 mlx4_warn(dev, "xxx HW2SW_MPT failed (%d)\n", err);
470
471 mr->enabled = MLX4_MR_EN_SW;
472 }
473 mlx4_mtt_cleanup(dev, &mr->mtt);
474 }
475 EXPORT_SYMBOL_GPL(mlx4_mr_free_reserved);
476
477 void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
478 {
479 mlx4_mr_free_reserved(dev, mr);
480 if (mr->enabled)
481 mlx4_mr_free_icm(dev, key_to_hw_index(mr->key));
482 mlx4_mr_release(dev, key_to_hw_index(mr->key));
483 }
484 EXPORT_SYMBOL_GPL(mlx4_mr_free);
485
486 int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
487 {
488 struct mlx4_cmd_mailbox *mailbox;
489 struct mlx4_mpt_entry *mpt_entry;
490 int err;
491
492 err = mlx4_mr_alloc_icm(dev, key_to_hw_index(mr->key));
493 if (err)
494 return err;
495
496 mailbox = mlx4_alloc_cmd_mailbox(dev);
497 if (IS_ERR(mailbox)) {
498 err = PTR_ERR(mailbox);
499 goto err_table;
500 }
501 mpt_entry = mailbox->buf;
502
503 memset(mpt_entry, 0, sizeof *mpt_entry);
504
505 mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_MIO |
506 MLX4_MPT_FLAG_REGION |
507 mr->access);
508
509 mpt_entry->key = cpu_to_be32(key_to_hw_index(mr->key));
510 mpt_entry->pd_flags = cpu_to_be32(mr->pd | MLX4_MPT_PD_FLAG_EN_INV);
511 mpt_entry->start = cpu_to_be64(mr->iova);
512 mpt_entry->length = cpu_to_be64(mr->size);
513 mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
514
515 if (mr->mtt.order < 0) {
516 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
517 mpt_entry->mtt_addr = 0;
518 } else {
519 mpt_entry->mtt_addr = cpu_to_be64(mlx4_mtt_addr(dev,
520 &mr->mtt));
521 }
522
523 if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) {
524 /* fast register MR in free state */
525 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
526 mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG |
527 MLX4_MPT_PD_FLAG_RAE);
528 mpt_entry->mtt_sz = cpu_to_be32(1 << mr->mtt.order);
529 } else {
530 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS);
531 }
532
533 err = mlx4_SW2HW_MPT(dev, mailbox,
534 key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
535 if (err) {
536 mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
537 goto err_cmd;
538 }
539 mr->enabled = MLX4_MR_EN_HW;
540
541 mlx4_free_cmd_mailbox(dev, mailbox);
542
543 return 0;
544
545 err_cmd:
546 mlx4_free_cmd_mailbox(dev, mailbox);
547
548 err_table:
549 mlx4_mr_free_icm(dev, key_to_hw_index(mr->key));
550 return err;
551 }
552 EXPORT_SYMBOL_GPL(mlx4_mr_enable);
553
554 static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
555 int start_index, int npages, u64 *page_list)
556 {
557 struct mlx4_priv *priv = mlx4_priv(dev);
558 __be64 *mtts;
559 dma_addr_t dma_handle;
560 int i;
561
562 mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->offset +
563 start_index, &dma_handle);
564
565 if (!mtts)
566 return -ENOMEM;
567
568 dma_sync_single_for_cpu(&dev->pdev->dev, dma_handle,
569 npages * sizeof (u64), DMA_TO_DEVICE);
570
571 for (i = 0; i < npages; ++i)
572 mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
573
574 dma_sync_single_for_device(&dev->pdev->dev, dma_handle,
575 npages * sizeof (u64), DMA_TO_DEVICE);
576
577 return 0;
578 }
579
580 int __mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
581 int start_index, int npages, u64 *page_list)
582 {
583 int err = 0;
584 int chunk;
585 int mtts_per_page;
586 int max_mtts_first_page;
587
588 /* compute how may mtts fit in the first page */
589 mtts_per_page = PAGE_SIZE / sizeof(u64);
590 max_mtts_first_page = mtts_per_page - (mtt->offset + start_index)
591 % mtts_per_page;
592
593 chunk = min_t(int, max_mtts_first_page, npages);
594
595 while (npages > 0) {
596 err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
597 if (err)
598 return err;
599 npages -= chunk;
600 start_index += chunk;
601 page_list += chunk;
602
603 chunk = min_t(int, mtts_per_page, npages);
604 }
605 return err;
606 }
607
608 int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
609 int start_index, int npages, u64 *page_list)
610 {
611 struct mlx4_cmd_mailbox *mailbox = NULL;
612 __be64 *inbox = NULL;
613 int chunk;
614 int err = 0;
615 int i;
616
617 if (mtt->order < 0)
618 return -EINVAL;
619
620 if (mlx4_is_mfunc(dev)) {
621 mailbox = mlx4_alloc_cmd_mailbox(dev);
622 if (IS_ERR(mailbox))
623 return PTR_ERR(mailbox);
624 inbox = mailbox->buf;
625
626 while (npages > 0) {
627 chunk = min_t(int, MLX4_MAILBOX_SIZE / sizeof(u64) - 2,
628 npages);
629 inbox[0] = cpu_to_be64(mtt->offset + start_index);
630 inbox[1] = 0;
631 for (i = 0; i < chunk; ++i)
632 inbox[i + 2] = cpu_to_be64(page_list[i] |
633 MLX4_MTT_FLAG_PRESENT);
634 err = mlx4_WRITE_MTT(dev, mailbox, chunk);
635 if (err) {
636 mlx4_free_cmd_mailbox(dev, mailbox);
637 return err;
638 }
639
640 npages -= chunk;
641 start_index += chunk;
642 page_list += chunk;
643 }
644 mlx4_free_cmd_mailbox(dev, mailbox);
645 return err;
646 }
647
648 return __mlx4_write_mtt(dev, mtt, start_index, npages, page_list);
649 }
650 EXPORT_SYMBOL_GPL(mlx4_write_mtt);
651
652 int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
653 struct mlx4_buf *buf)
654 {
655 u64 *page_list;
656 int err;
657 int i;
658
659 page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
660 if (!page_list)
661 return -ENOMEM;
662
663 for (i = 0; i < buf->npages; ++i)
664 if (buf->nbufs == 1)
665 page_list[i] = buf->direct.map + (i << buf->page_shift);
666 else
667 page_list[i] = buf->page_list[i].map;
668
669 err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
670
671 kfree(page_list);
672 return err;
673 }
674 EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
675
676 int mlx4_init_mr_table(struct mlx4_dev *dev)
677 {
678 struct mlx4_priv *priv = mlx4_priv(dev);
679 struct mlx4_mr_table *mr_table = &priv->mr_table;
680 int err;
681
682 if (!is_power_of_2(dev->caps.num_mpts))
683 return -EINVAL;
684
685 /* Nothing to do for slaves - all MR handling is forwarded
686 * to the master */
687 if (mlx4_is_slave(dev))
688 return 0;
689
690 err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
691 ~0, dev->caps.reserved_mrws, 0);
692 if (err)
693 return err;
694
695 err = mlx4_buddy_init(&mr_table->mtt_buddy,
696 ilog2(dev->caps.num_mtts /
697 (1 << log_mtts_per_seg)));
698 if (err)
699 goto err_buddy;
700
701 if (dev->caps.reserved_mtts) {
702 priv->reserved_mtts =
703 mlx4_alloc_mtt_range(dev,
704 fls(dev->caps.reserved_mtts - 1));
705 if (priv->reserved_mtts < 0) {
706 mlx4_warn(dev, "MTT table of order %d is too small.\n",
707 mr_table->mtt_buddy.max_order);
708 err = -ENOMEM;
709 goto err_reserve_mtts;
710 }
711 }
712
713 return 0;
714
715 err_reserve_mtts:
716 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
717
718 err_buddy:
719 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
720
721 return err;
722 }
723
724 void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
725 {
726 struct mlx4_priv *priv = mlx4_priv(dev);
727 struct mlx4_mr_table *mr_table = &priv->mr_table;
728
729 if (mlx4_is_slave(dev))
730 return;
731 if (priv->reserved_mtts >= 0)
732 mlx4_free_mtt_range(dev, priv->reserved_mtts,
733 fls(dev->caps.reserved_mtts - 1));
734 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
735 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
736 }
737
738 static inline int mlx4_check_fmr(struct mlx4_fmr *fmr, u64 *page_list,
739 int npages, u64 iova)
740 {
741 int i, page_mask;
742
743 if (npages > fmr->max_pages)
744 return -EINVAL;
745
746 page_mask = (1 << fmr->page_shift) - 1;
747
748 /* We are getting page lists, so va must be page aligned. */
749 if (iova & page_mask)
750 return -EINVAL;
751
752 /* Trust the user not to pass misaligned data in page_list */
753 if (0)
754 for (i = 0; i < npages; ++i) {
755 if (page_list[i] & ~page_mask)
756 return -EINVAL;
757 }
758
759 if (fmr->maps >= fmr->max_maps)
760 return -EINVAL;
761
762 return 0;
763 }
764
765 int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list,
766 int npages, u64 iova, u32 *lkey, u32 *rkey)
767 {
768 u32 key;
769 int i, err;
770
771 err = mlx4_check_fmr(fmr, page_list, npages, iova);
772 if (err)
773 return err;
774
775 ++fmr->maps;
776
777 key = key_to_hw_index(fmr->mr.key);
778 key += dev->caps.num_mpts;
779 *lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
780
781 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
782
783 /* Make sure MPT status is visible before writing MTT entries */
784 wmb();
785
786 dma_sync_single_for_cpu(&dev->pdev->dev, fmr->dma_handle,
787 npages * sizeof(u64), DMA_TO_DEVICE);
788
789 for (i = 0; i < npages; ++i)
790 fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
791
792 dma_sync_single_for_device(&dev->pdev->dev, fmr->dma_handle,
793 npages * sizeof(u64), DMA_TO_DEVICE);
794
795 fmr->mpt->key = cpu_to_be32(key);
796 fmr->mpt->lkey = cpu_to_be32(key);
797 fmr->mpt->length = cpu_to_be64(npages * (1ull << fmr->page_shift));
798 fmr->mpt->start = cpu_to_be64(iova);
799
800 /* Make MTT entries are visible before setting MPT status */
801 wmb();
802
803 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_HW;
804
805 /* Make sure MPT status is visible before consumer can use FMR */
806 wmb();
807
808 return 0;
809 }
810 EXPORT_SYMBOL_GPL(mlx4_map_phys_fmr);
811
812 int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
813 int max_maps, u8 page_shift, struct mlx4_fmr *fmr)
814 {
815 struct mlx4_priv *priv = mlx4_priv(dev);
816 u64 mtt_offset;
817 int err = -ENOMEM;
818
819 if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32)
820 return -EINVAL;
821
822 /* All MTTs must fit in the same page */
823 if (max_pages * sizeof *fmr->mtts > PAGE_SIZE)
824 return -EINVAL;
825
826 fmr->page_shift = page_shift;
827 fmr->max_pages = max_pages;
828 fmr->max_maps = max_maps;
829 fmr->maps = 0;
830
831 err = mlx4_mr_alloc(dev, pd, 0, 0, access, max_pages,
832 page_shift, &fmr->mr);
833 if (err)
834 return err;
835
836 mtt_offset = fmr->mr.mtt.offset * dev->caps.mtt_entry_sz;
837
838 fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table,
839 fmr->mr.mtt.offset,
840 &fmr->dma_handle);
841
842 if (!fmr->mtts) {
843 err = -ENOMEM;
844 goto err_free;
845 }
846
847 return 0;
848
849 err_free:
850 mlx4_mr_free(dev, &fmr->mr);
851 return err;
852 }
853 EXPORT_SYMBOL_GPL(mlx4_fmr_alloc);
854
855 int mlx4_fmr_alloc_reserved(struct mlx4_dev *dev, u32 mridx,
856 u32 pd, u32 access, int max_pages,
857 int max_maps, u8 page_shift, struct mlx4_fmr *fmr)
858 {
859 struct mlx4_priv *priv = mlx4_priv(dev);
860 int err = -ENOMEM;
861
862 if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32)
863 return -EINVAL;
864
865 /* All MTTs must fit in the same page */
866 if (max_pages * sizeof *fmr->mtts > PAGE_SIZE)
867 return -EINVAL;
868
869 fmr->page_shift = page_shift;
870 fmr->max_pages = max_pages;
871 fmr->max_maps = max_maps;
872 fmr->maps = 0;
873
874 err = mlx4_mr_alloc_reserved(dev, mridx, pd, 0, 0, access, max_pages,
875 page_shift, &fmr->mr);
876 if (err)
877 return err;
878
879 fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table,
880 fmr->mr.mtt.offset,
881 &fmr->dma_handle);
882 if (!fmr->mtts) {
883 err = -ENOMEM;
884 goto err_free;
885 }
886
887 return 0;
888
889 err_free:
890 mlx4_mr_free_reserved(dev, &fmr->mr);
891 return err;
892 }
893 EXPORT_SYMBOL_GPL(mlx4_fmr_alloc_reserved);
894
895 int mlx4_fmr_enable(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
896 {
897 struct mlx4_priv *priv = mlx4_priv(dev);
898 int err;
899
900 err = mlx4_mr_enable(dev, &fmr->mr);
901 if (err)
902 return err;
903
904 fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table,
905 key_to_hw_index(fmr->mr.key), NULL);
906 if (!fmr->mpt)
907 return -ENOMEM;
908
909 return 0;
910 }
911 EXPORT_SYMBOL_GPL(mlx4_fmr_enable);
912
913 void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr,
914 u32 *lkey, u32 *rkey)
915 {
916 struct mlx4_cmd_mailbox *mailbox;
917 int err;
918
919 if (!fmr->maps)
920 return;
921
922 fmr->maps = 0;
923
924 mailbox = mlx4_alloc_cmd_mailbox(dev);
925 if (IS_ERR(mailbox)) {
926 err = PTR_ERR(mailbox);
927 printk(KERN_WARNING "mlx4_ib: mlx4_alloc_cmd_mailbox"
928 " failed (%d)\n", err);
929 return;
930 }
931
932 err = mlx4_HW2SW_MPT(dev, NULL,
933 key_to_hw_index(fmr->mr.key) &
934 (dev->caps.num_mpts - 1));
935 mlx4_free_cmd_mailbox(dev, mailbox);
936 if (err) {
937 printk(KERN_WARNING "mlx4_ib: mlx4_HW2SW_MPT failed (%d)\n",
938 err);
939 return;
940 }
941 fmr->mr.enabled = MLX4_MR_EN_SW;
942 }
943 EXPORT_SYMBOL_GPL(mlx4_fmr_unmap);
944
945 int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
946 {
947 if (fmr->maps)
948 return -EBUSY;
949
950 mlx4_mr_free(dev, &fmr->mr);
951 fmr->mr.enabled = MLX4_MR_DISABLED;
952
953 return 0;
954 }
955 EXPORT_SYMBOL_GPL(mlx4_fmr_free);
956
957 int mlx4_fmr_free_reserved(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
958 {
959 if (fmr->maps)
960 return -EBUSY;
961
962 mlx4_mr_free_reserved(dev, &fmr->mr);
963 fmr->mr.enabled = MLX4_MR_DISABLED;
964
965 return 0;
966 }
967 EXPORT_SYMBOL_GPL(mlx4_fmr_free_reserved);
968
969 int mlx4_SYNC_TPT(struct mlx4_dev *dev)
970 {
971 return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT, 1000,
972 MLX4_CMD_WRAPPED);
973 }
974 EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);