2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 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
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
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
35 #include <linux/init.h>
36 #include <linux/errno.h>
38 #include <linux/mlx4/cmd.h>
44 * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
46 struct mlx4_mpt_entry {
60 __be32 first_byte_offset;
61 } __attribute__((packed));
63 #define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28)
64 #define MLX4_MPT_FLAG_MIO (1 << 17)
65 #define MLX4_MPT_FLAG_BIND_ENABLE (1 << 15)
66 #define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
67 #define MLX4_MPT_FLAG_REGION (1 << 8)
69 #define MLX4_MTT_FLAG_PRESENT 1
71 #define MLX4_MPT_STATUS_SW 0xF0
72 #define MLX4_MPT_STATUS_HW 0x00
74 static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
80 spin_lock(&buddy->lock);
82 for (o = order; o <= buddy->max_order; ++o) {
83 m = 1 << (buddy->max_order - o);
84 seg = find_first_bit(buddy->bits[o], m);
89 spin_unlock(&buddy->lock);
93 clear_bit(seg, buddy->bits[o]);
98 set_bit(seg ^ 1, buddy->bits[o]);
101 spin_unlock(&buddy->lock);
108 static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
112 spin_lock(&buddy->lock);
114 while (test_bit(seg ^ 1, buddy->bits[order])) {
115 clear_bit(seg ^ 1, buddy->bits[order]);
120 set_bit(seg, buddy->bits[order]);
122 spin_unlock(&buddy->lock);
125 static int __devinit mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
129 buddy->max_order = max_order;
130 spin_lock_init(&buddy->lock);
132 buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
137 for (i = 0; i <= buddy->max_order; ++i) {
138 s = BITS_TO_LONGS(1 << (buddy->max_order - i));
139 buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
142 bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
145 set_bit(0, buddy->bits[buddy->max_order]);
150 for (i = 0; i <= buddy->max_order; ++i)
151 kfree(buddy->bits[i]);
159 static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
163 for (i = 0; i <= buddy->max_order; ++i)
164 kfree(buddy->bits[i]);
169 static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
171 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
174 seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
178 if (mlx4_table_get_range(dev, &mr_table->mtt_table, seg,
179 seg + (1 << order) - 1)) {
180 mlx4_buddy_free(&mr_table->mtt_buddy, seg, order);
187 int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
188 struct mlx4_mtt *mtt)
194 mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
197 mtt->page_shift = page_shift;
199 for (mtt->order = 0, i = MLX4_MTT_ENTRY_PER_SEG; i < npages; i <<= 1)
202 mtt->first_seg = mlx4_alloc_mtt_range(dev, mtt->order);
203 if (mtt->first_seg == -1)
208 EXPORT_SYMBOL_GPL(mlx4_mtt_init);
210 void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
212 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
217 mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
218 mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
219 mtt->first_seg + (1 << mtt->order) - 1);
221 EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
223 u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
225 return (u64) mtt->first_seg * dev->caps.mtt_entry_sz;
227 EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
229 static u32 hw_index_to_key(u32 ind)
231 return (ind >> 24) | (ind << 8);
234 static u32 key_to_hw_index(u32 key)
236 return (key << 24) | (key >> 8);
239 static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
242 return mlx4_cmd(dev, mailbox->dma, mpt_index, 0, MLX4_CMD_SW2HW_MPT,
243 MLX4_CMD_TIME_CLASS_B);
246 static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
249 return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
250 !mailbox, MLX4_CMD_HW2SW_MPT, MLX4_CMD_TIME_CLASS_B);
253 int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
254 int npages, int page_shift, struct mlx4_mr *mr)
256 struct mlx4_priv *priv = mlx4_priv(dev);
260 index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
269 mr->key = hw_index_to_key(index);
271 err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
273 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
277 EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
279 void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
281 struct mlx4_priv *priv = mlx4_priv(dev);
285 err = mlx4_HW2SW_MPT(dev, NULL,
286 key_to_hw_index(mr->key) &
287 (dev->caps.num_mpts - 1));
289 mlx4_warn(dev, "HW2SW_MPT failed (%d)\n", err);
292 mlx4_mtt_cleanup(dev, &mr->mtt);
293 mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
295 EXPORT_SYMBOL_GPL(mlx4_mr_free);
297 int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
299 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
300 struct mlx4_cmd_mailbox *mailbox;
301 struct mlx4_mpt_entry *mpt_entry;
304 err = mlx4_table_get(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
308 mailbox = mlx4_alloc_cmd_mailbox(dev);
309 if (IS_ERR(mailbox)) {
310 err = PTR_ERR(mailbox);
313 mpt_entry = mailbox->buf;
315 memset(mpt_entry, 0, sizeof *mpt_entry);
317 mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS |
319 MLX4_MPT_FLAG_REGION |
322 mpt_entry->key = cpu_to_be32(key_to_hw_index(mr->key));
323 mpt_entry->pd = cpu_to_be32(mr->pd);
324 mpt_entry->start = cpu_to_be64(mr->iova);
325 mpt_entry->length = cpu_to_be64(mr->size);
326 mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
327 if (mr->mtt.order < 0) {
328 mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
329 mpt_entry->mtt_seg = 0;
331 mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));
333 err = mlx4_SW2HW_MPT(dev, mailbox,
334 key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
336 mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
342 mlx4_free_cmd_mailbox(dev, mailbox);
347 mlx4_free_cmd_mailbox(dev, mailbox);
350 mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
353 EXPORT_SYMBOL_GPL(mlx4_mr_enable);
355 static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
356 int start_index, int npages, u64 *page_list)
358 struct mlx4_priv *priv = mlx4_priv(dev);
360 dma_addr_t dma_handle;
362 int s = start_index * sizeof (u64);
364 /* All MTTs must fit in the same page */
365 if (start_index / (PAGE_SIZE / sizeof (u64)) !=
366 (start_index + npages - 1) / (PAGE_SIZE / sizeof (u64)))
369 if (start_index & (MLX4_MTT_ENTRY_PER_SEG - 1))
372 mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->first_seg +
373 s / dev->caps.mtt_entry_sz, &dma_handle);
377 for (i = 0; i < npages; ++i)
378 mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
380 dma_sync_single(&dev->pdev->dev, dma_handle, npages * sizeof (u64), DMA_TO_DEVICE);
385 int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
386 int start_index, int npages, u64 *page_list)
395 chunk = min_t(int, PAGE_SIZE / sizeof(u64), npages);
396 err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
401 start_index += chunk;
407 EXPORT_SYMBOL_GPL(mlx4_write_mtt);
409 int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
410 struct mlx4_buf *buf)
416 page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
420 for (i = 0; i < buf->npages; ++i)
422 page_list[i] = buf->u.direct.map + (i << buf->page_shift);
424 page_list[i] = buf->u.page_list[i].map;
426 err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
431 EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
433 int __devinit mlx4_init_mr_table(struct mlx4_dev *dev)
435 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
438 err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
439 ~0, dev->caps.reserved_mrws);
443 err = mlx4_buddy_init(&mr_table->mtt_buddy,
444 ilog2(dev->caps.num_mtt_segs));
448 if (dev->caps.reserved_mtts) {
449 if (mlx4_alloc_mtt_range(dev, fls(dev->caps.reserved_mtts - 1)) == -1) {
450 mlx4_warn(dev, "MTT table of order %d is too small.\n",
451 mr_table->mtt_buddy.max_order);
453 goto err_reserve_mtts;
460 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
463 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
468 void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
470 struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
472 mlx4_buddy_cleanup(&mr_table->mtt_buddy);
473 mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
476 static inline int mlx4_check_fmr(struct mlx4_fmr *fmr, u64 *page_list,
477 int npages, u64 iova)
481 if (npages > fmr->max_pages)
484 page_mask = (1 << fmr->page_shift) - 1;
486 /* We are getting page lists, so va must be page aligned. */
487 if (iova & page_mask)
490 /* Trust the user not to pass misaligned data in page_list */
492 for (i = 0; i < npages; ++i) {
493 if (page_list[i] & ~page_mask)
497 if (fmr->maps >= fmr->max_maps)
503 int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list,
504 int npages, u64 iova, u32 *lkey, u32 *rkey)
509 err = mlx4_check_fmr(fmr, page_list, npages, iova);
515 key = key_to_hw_index(fmr->mr.key);
516 key += dev->caps.num_mpts;
517 *lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
519 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
521 /* Make sure MPT status is visible before writing MTT entries */
524 for (i = 0; i < npages; ++i)
525 fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
527 dma_sync_single(&dev->pdev->dev, fmr->dma_handle,
528 npages * sizeof(u64), DMA_TO_DEVICE);
530 fmr->mpt->key = cpu_to_be32(key);
531 fmr->mpt->lkey = cpu_to_be32(key);
532 fmr->mpt->length = cpu_to_be64(npages * (1ull << fmr->page_shift));
533 fmr->mpt->start = cpu_to_be64(iova);
535 /* Make MTT entries are visible before setting MPT status */
538 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_HW;
540 /* Make sure MPT status is visible before consumer can use FMR */
545 EXPORT_SYMBOL_GPL(mlx4_map_phys_fmr);
547 int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
548 int max_maps, u8 page_shift, struct mlx4_fmr *fmr)
550 struct mlx4_priv *priv = mlx4_priv(dev);
554 if (page_shift < 12 || page_shift >= 32)
557 /* All MTTs must fit in the same page */
558 if (max_pages * sizeof *fmr->mtts > PAGE_SIZE)
561 fmr->page_shift = page_shift;
562 fmr->max_pages = max_pages;
563 fmr->max_maps = max_maps;
566 err = mlx4_mr_alloc(dev, pd, 0, 0, access, max_pages,
567 page_shift, &fmr->mr);
571 mtt_seg = fmr->mr.mtt.first_seg * dev->caps.mtt_entry_sz;
573 fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table,
574 fmr->mr.mtt.first_seg,
581 fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table,
582 key_to_hw_index(fmr->mr.key), NULL);
591 mlx4_mr_free(dev, &fmr->mr);
594 EXPORT_SYMBOL_GPL(mlx4_fmr_alloc);
596 int mlx4_fmr_enable(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
598 return mlx4_mr_enable(dev, &fmr->mr);
600 EXPORT_SYMBOL_GPL(mlx4_fmr_enable);
602 void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr,
603 u32 *lkey, u32 *rkey)
610 key = key_to_hw_index(fmr->mr.key);
611 key &= dev->caps.num_mpts - 1;
612 *lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
616 *(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
618 EXPORT_SYMBOL_GPL(mlx4_fmr_unmap);
620 int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
626 mlx4_mr_free(dev, &fmr->mr);
630 EXPORT_SYMBOL_GPL(mlx4_fmr_free);
632 int mlx4_SYNC_TPT(struct mlx4_dev *dev)
634 return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT, 1000);
636 EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);