timerfd: Allow timers to be cancelled when clock was set
[linux-2.6/linux-mips.git] / drivers / net / mlx4 / mr.c
blob9c188bdd7f4f2c5a6a3a124749d513c4d6b77958
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.
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:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
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.
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.
35 #include <linux/errno.h>
36 #include <linux/slab.h>
38 #include <linux/mlx4/cmd.h>
40 #include "mlx4.h"
41 #include "icm.h"
44 * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
46 struct mlx4_mpt_entry {
47 __be32 flags;
48 __be32 qpn;
49 __be32 key;
50 __be32 pd_flags;
51 __be64 start;
52 __be64 length;
53 __be32 lkey;
54 __be32 win_cnt;
55 u8 reserved1[3];
56 u8 mtt_rep;
57 __be64 mtt_seg;
58 __be32 mtt_sz;
59 __be32 entity_size;
60 __be32 first_byte_offset;
61 } __packed;
63 #define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28)
64 #define MLX4_MPT_FLAG_FREE (0x3UL << 28)
65 #define MLX4_MPT_FLAG_MIO (1 << 17)
66 #define MLX4_MPT_FLAG_BIND_ENABLE (1 << 15)
67 #define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
68 #define MLX4_MPT_FLAG_REGION (1 << 8)
70 #define MLX4_MPT_PD_FLAG_FAST_REG (1 << 27)
71 #define MLX4_MPT_PD_FLAG_RAE (1 << 28)
72 #define MLX4_MPT_PD_FLAG_EN_INV (3 << 24)
74 #define MLX4_MPT_STATUS_SW 0xF0
75 #define MLX4_MPT_STATUS_HW 0x00
77 static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
79 int o;
80 int m;
81 u32 seg;
83 spin_lock(&buddy->lock);
85 for (o = order; o <= buddy->max_order; ++o)
86 if (buddy->num_free[o]) {
87 m = 1 << (buddy->max_order - o);
88 seg = find_first_bit(buddy->bits[o], m);
89 if (seg < m)
90 goto found;
93 spin_unlock(&buddy->lock);
94 return -1;
96 found:
97 clear_bit(seg, buddy->bits[o]);
98 --buddy->num_free[o];
100 while (o > order) {
101 --o;
102 seg <<= 1;
103 set_bit(seg ^ 1, buddy->bits[o]);
104 ++buddy->num_free[o];
107 spin_unlock(&buddy->lock);
109 seg <<= order;
111 return seg;
114 static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
116 seg >>= order;
118 spin_lock(&buddy->lock);
120 while (test_bit(seg ^ 1, buddy->bits[order])) {
121 clear_bit(seg ^ 1, buddy->bits[order]);
122 --buddy->num_free[order];
123 seg >>= 1;
124 ++order;
127 set_bit(seg, buddy->bits[order]);
128 ++buddy->num_free[order];
130 spin_unlock(&buddy->lock);
133 static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
135 int i, s;
137 buddy->max_order = max_order;
138 spin_lock_init(&buddy->lock);
140 buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
141 GFP_KERNEL);
142 buddy->num_free = kzalloc((buddy->max_order + 1) * sizeof (int *),
143 GFP_KERNEL);
144 if (!buddy->bits || !buddy->num_free)
145 goto err_out;
147 for (i = 0; i <= buddy->max_order; ++i) {
148 s = BITS_TO_LONGS(1 << (buddy->max_order - i));
149 buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
150 if (!buddy->bits[i])
151 goto err_out_free;
152 bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
155 set_bit(0, buddy->bits[buddy->max_order]);
156 buddy->num_free[buddy->max_order] = 1;
158 return 0;
160 err_out_free:
161 for (i = 0; i <= buddy->max_order; ++i)
162 kfree(buddy->bits[i]);
164 err_out:
165 kfree(buddy->bits);
166 kfree(buddy->num_free);
168 return -ENOMEM;
171 static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
173 int i;
175 for (i = 0; i <= buddy->max_order; ++i)
176 kfree(buddy->bits[i]);
178 kfree(buddy->bits);
179 kfree(buddy->num_free);
182 static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
184 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
185 u32 seg;
187 seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
188 if (seg == -1)
189 return -1;
191 if (mlx4_table_get_range(dev, &mr_table->mtt_table, seg,
192 seg + (1 << order) - 1)) {
193 mlx4_buddy_free(&mr_table->mtt_buddy, seg, order);
194 return -1;
197 return seg;
200 int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
201 struct mlx4_mtt *mtt)
203 int i;
205 if (!npages) {
206 mtt->order = -1;
207 mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
208 return 0;
209 } else
210 mtt->page_shift = page_shift;
212 for (mtt->order = 0, i = dev->caps.mtts_per_seg; i < npages; i <<= 1)
213 ++mtt->order;
215 mtt->first_seg = mlx4_alloc_mtt_range(dev, mtt->order);
216 if (mtt->first_seg == -1)
217 return -ENOMEM;
219 return 0;
221 EXPORT_SYMBOL_GPL(mlx4_mtt_init);
223 void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
225 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
227 if (mtt->order < 0)
228 return;
230 mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
231 mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
232 mtt->first_seg + (1 << mtt->order) - 1);
234 EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
236 u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
238 return (u64) mtt->first_seg * dev->caps.mtt_entry_sz;
240 EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
242 static u32 hw_index_to_key(u32 ind)
244 return (ind >> 24) | (ind << 8);
247 static u32 key_to_hw_index(u32 key)
249 return (key << 24) | (key >> 8);
252 static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
253 int mpt_index)
255 return mlx4_cmd(dev, mailbox->dma, mpt_index, 0, MLX4_CMD_SW2HW_MPT,
256 MLX4_CMD_TIME_CLASS_B);
259 static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
260 int mpt_index)
262 return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
263 !mailbox, MLX4_CMD_HW2SW_MPT, MLX4_CMD_TIME_CLASS_B);
266 int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
267 int npages, int page_shift, struct mlx4_mr *mr)
269 struct mlx4_priv *priv = mlx4_priv(dev);
270 u32 index;
271 int err;
273 index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
274 if (index == -1)
275 return -ENOMEM;
277 mr->iova = iova;
278 mr->size = size;
279 mr->pd = pd;
280 mr->access = access;
281 mr->enabled = 0;
282 mr->key = hw_index_to_key(index);
284 err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
285 if (err)
286 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
288 return err;
290 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
292 void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
294 struct mlx4_priv *priv = mlx4_priv(dev);
295 int err;
297 if (mr->enabled) {
298 err = mlx4_HW2SW_MPT(dev, NULL,
299 key_to_hw_index(mr->key) &
300 (dev->caps.num_mpts - 1));
301 if (err)
302 mlx4_warn(dev, "HW2SW_MPT failed (%d)\n", err);
305 mlx4_mtt_cleanup(dev, &mr->mtt);
306 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
308 EXPORT_SYMBOL_GPL(mlx4_mr_free);
310 int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
312 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
313 struct mlx4_cmd_mailbox *mailbox;
314 struct mlx4_mpt_entry *mpt_entry;
315 int err;
317 err = mlx4_table_get(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
318 if (err)
319 return err;
321 mailbox = mlx4_alloc_cmd_mailbox(dev);
322 if (IS_ERR(mailbox)) {
323 err = PTR_ERR(mailbox);
324 goto err_table;
326 mpt_entry = mailbox->buf;
328 memset(mpt_entry, 0, sizeof *mpt_entry);
330 mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_MIO |
331 MLX4_MPT_FLAG_REGION |
332 mr->access);
334 mpt_entry->key = cpu_to_be32(key_to_hw_index(mr->key));
335 mpt_entry->pd_flags = cpu_to_be32(mr->pd | MLX4_MPT_PD_FLAG_EN_INV);
336 mpt_entry->start = cpu_to_be64(mr->iova);
337 mpt_entry->length = cpu_to_be64(mr->size);
338 mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
340 if (mr->mtt.order < 0) {
341 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
342 mpt_entry->mtt_seg = 0;
343 } else {
344 mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));
347 if (mr->mtt.order >= 0 && mr->mtt.page_shift == 0) {
348 /* fast register MR in free state */
349 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_FREE);
350 mpt_entry->pd_flags |= cpu_to_be32(MLX4_MPT_PD_FLAG_FAST_REG |
351 MLX4_MPT_PD_FLAG_RAE);
352 mpt_entry->mtt_sz = cpu_to_be32((1 << mr->mtt.order) *
353 dev->caps.mtts_per_seg);
354 } else {
355 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS);
358 err = mlx4_SW2HW_MPT(dev, mailbox,
359 key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
360 if (err) {
361 mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
362 goto err_cmd;
365 mr->enabled = 1;
367 mlx4_free_cmd_mailbox(dev, mailbox);
369 return 0;
371 err_cmd:
372 mlx4_free_cmd_mailbox(dev, mailbox);
374 err_table:
375 mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
376 return err;
378 EXPORT_SYMBOL_GPL(mlx4_mr_enable);
380 static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
381 int start_index, int npages, u64 *page_list)
383 struct mlx4_priv *priv = mlx4_priv(dev);
384 __be64 *mtts;
385 dma_addr_t dma_handle;
386 int i;
387 int s = start_index * sizeof (u64);
389 /* All MTTs must fit in the same page */
390 if (start_index / (PAGE_SIZE / sizeof (u64)) !=
391 (start_index + npages - 1) / (PAGE_SIZE / sizeof (u64)))
392 return -EINVAL;
394 if (start_index & (dev->caps.mtts_per_seg - 1))
395 return -EINVAL;
397 mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->first_seg +
398 s / dev->caps.mtt_entry_sz, &dma_handle);
399 if (!mtts)
400 return -ENOMEM;
402 dma_sync_single_for_cpu(&dev->pdev->dev, dma_handle,
403 npages * sizeof (u64), DMA_TO_DEVICE);
405 for (i = 0; i < npages; ++i)
406 mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
408 dma_sync_single_for_device(&dev->pdev->dev, dma_handle,
409 npages * sizeof (u64), DMA_TO_DEVICE);
411 return 0;
414 int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
415 int start_index, int npages, u64 *page_list)
417 int chunk;
418 int err;
420 if (mtt->order < 0)
421 return -EINVAL;
423 while (npages > 0) {
424 chunk = min_t(int, PAGE_SIZE / sizeof(u64), npages);
425 err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
426 if (err)
427 return err;
429 npages -= chunk;
430 start_index += chunk;
431 page_list += chunk;
434 return 0;
436 EXPORT_SYMBOL_GPL(mlx4_write_mtt);
438 int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
439 struct mlx4_buf *buf)
441 u64 *page_list;
442 int err;
443 int i;
445 page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
446 if (!page_list)
447 return -ENOMEM;
449 for (i = 0; i < buf->npages; ++i)
450 if (buf->nbufs == 1)
451 page_list[i] = buf->direct.map + (i << buf->page_shift);
452 else
453 page_list[i] = buf->page_list[i].map;
455 err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
457 kfree(page_list);
458 return err;
460 EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
462 int mlx4_init_mr_table(struct mlx4_dev *dev)
464 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
465 int err;
467 err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
468 ~0, dev->caps.reserved_mrws, 0);
469 if (err)
470 return err;
472 err = mlx4_buddy_init(&mr_table->mtt_buddy,
473 ilog2(dev->caps.num_mtt_segs));
474 if (err)
475 goto err_buddy;
477 if (dev->caps.reserved_mtts) {
478 if (mlx4_alloc_mtt_range(dev, fls(dev->caps.reserved_mtts - 1)) == -1) {
479 mlx4_warn(dev, "MTT table of order %d is too small.\n",
480 mr_table->mtt_buddy.max_order);
481 err = -ENOMEM;
482 goto err_reserve_mtts;
486 return 0;
488 err_reserve_mtts:
489 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
491 err_buddy:
492 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
494 return err;
497 void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
499 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
501 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
502 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
505 static inline int mlx4_check_fmr(struct mlx4_fmr *fmr, u64 *page_list,
506 int npages, u64 iova)
508 int i, page_mask;
510 if (npages > fmr->max_pages)
511 return -EINVAL;
513 page_mask = (1 << fmr->page_shift) - 1;
515 /* We are getting page lists, so va must be page aligned. */
516 if (iova & page_mask)
517 return -EINVAL;
519 /* Trust the user not to pass misaligned data in page_list */
520 if (0)
521 for (i = 0; i < npages; ++i) {
522 if (page_list[i] & ~page_mask)
523 return -EINVAL;
526 if (fmr->maps >= fmr->max_maps)
527 return -EINVAL;
529 return 0;
532 int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list,
533 int npages, u64 iova, u32 *lkey, u32 *rkey)
535 u32 key;
536 int i, err;
538 err = mlx4_check_fmr(fmr, page_list, npages, iova);
539 if (err)
540 return err;
542 ++fmr->maps;
544 key = key_to_hw_index(fmr->mr.key);
545 key += dev->caps.num_mpts;
546 *lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
548 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
550 /* Make sure MPT status is visible before writing MTT entries */
551 wmb();
553 dma_sync_single_for_cpu(&dev->pdev->dev, fmr->dma_handle,
554 npages * sizeof(u64), DMA_TO_DEVICE);
556 for (i = 0; i < npages; ++i)
557 fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
559 dma_sync_single_for_device(&dev->pdev->dev, fmr->dma_handle,
560 npages * sizeof(u64), DMA_TO_DEVICE);
562 fmr->mpt->key = cpu_to_be32(key);
563 fmr->mpt->lkey = cpu_to_be32(key);
564 fmr->mpt->length = cpu_to_be64(npages * (1ull << fmr->page_shift));
565 fmr->mpt->start = cpu_to_be64(iova);
567 /* Make MTT entries are visible before setting MPT status */
568 wmb();
570 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_HW;
572 /* Make sure MPT status is visible before consumer can use FMR */
573 wmb();
575 return 0;
577 EXPORT_SYMBOL_GPL(mlx4_map_phys_fmr);
579 int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
580 int max_maps, u8 page_shift, struct mlx4_fmr *fmr)
582 struct mlx4_priv *priv = mlx4_priv(dev);
583 u64 mtt_seg;
584 int err = -ENOMEM;
586 if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32)
587 return -EINVAL;
589 /* All MTTs must fit in the same page */
590 if (max_pages * sizeof *fmr->mtts > PAGE_SIZE)
591 return -EINVAL;
593 fmr->page_shift = page_shift;
594 fmr->max_pages = max_pages;
595 fmr->max_maps = max_maps;
596 fmr->maps = 0;
598 err = mlx4_mr_alloc(dev, pd, 0, 0, access, max_pages,
599 page_shift, &fmr->mr);
600 if (err)
601 return err;
603 mtt_seg = fmr->mr.mtt.first_seg * dev->caps.mtt_entry_sz;
605 fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table,
606 fmr->mr.mtt.first_seg,
607 &fmr->dma_handle);
608 if (!fmr->mtts) {
609 err = -ENOMEM;
610 goto err_free;
613 return 0;
615 err_free:
616 mlx4_mr_free(dev, &fmr->mr);
617 return err;
619 EXPORT_SYMBOL_GPL(mlx4_fmr_alloc);
621 int mlx4_fmr_enable(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
623 struct mlx4_priv *priv = mlx4_priv(dev);
624 int err;
626 err = mlx4_mr_enable(dev, &fmr->mr);
627 if (err)
628 return err;
630 fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table,
631 key_to_hw_index(fmr->mr.key), NULL);
632 if (!fmr->mpt)
633 return -ENOMEM;
635 return 0;
637 EXPORT_SYMBOL_GPL(mlx4_fmr_enable);
639 void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr,
640 u32 *lkey, u32 *rkey)
642 if (!fmr->maps)
643 return;
645 fmr->maps = 0;
647 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
649 EXPORT_SYMBOL_GPL(mlx4_fmr_unmap);
651 int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
653 if (fmr->maps)
654 return -EBUSY;
656 fmr->mr.enabled = 0;
657 mlx4_mr_free(dev, &fmr->mr);
659 return 0;
661 EXPORT_SYMBOL_GPL(mlx4_fmr_free);
663 int mlx4_SYNC_TPT(struct mlx4_dev *dev)
665 return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT, 1000);
667 EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);