1/*
2 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses.  You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 *     Redistribution and use in source and binary forms, with or
12 *     without modification, are permitted provided that the following
13 *     conditions are met:
14 *
15 *      - Redistributions of source code must retain the above
16 *        copyright notice, this list of conditions and the following
17 *        disclaimer.
18 *
19 *      - Redistributions in binary form must reproduce the above
20 *        copyright notice, this list of conditions and the following
21 *        disclaimer in the documentation and/or other materials
22 *        provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/slab.h>
35#include <linux/errno.h>
36
37#include "mthca_dev.h"
38#include "mthca_cmd.h"
39#include "mthca_memfree.h"
40
41struct mthca_mtt {
42	struct mthca_buddy *buddy;
43	int                 order;
44	u32                 first_seg;
45};
46
47/*
48 * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
49 */
50struct mthca_mpt_entry {
51	__be32 flags;
52	__be32 page_size;
53	__be32 key;
54	__be32 pd;
55	__be64 start;
56	__be64 length;
57	__be32 lkey;
58	__be32 window_count;
59	__be32 window_count_limit;
60	__be64 mtt_seg;
61	__be32 mtt_sz;		/* Arbel only */
62	u32    reserved[2];
63} __attribute__((packed));
64
65#define MTHCA_MPT_FLAG_SW_OWNS       (0xfUL << 28)
66#define MTHCA_MPT_FLAG_MIO           (1 << 17)
67#define MTHCA_MPT_FLAG_BIND_ENABLE   (1 << 15)
68#define MTHCA_MPT_FLAG_PHYSICAL      (1 <<  9)
69#define MTHCA_MPT_FLAG_REGION        (1 <<  8)
70
71#define MTHCA_MTT_FLAG_PRESENT       1
72
73#define MTHCA_MPT_STATUS_SW 0xF0
74#define MTHCA_MPT_STATUS_HW 0x00
75
76#define SINAI_FMR_KEY_INC 0x1000000
77
78/*
79 * Buddy allocator for MTT segments (currently not very efficient
80 * since it doesn't keep a free list and just searches linearly
81 * through the bitmaps)
82 */
83
84static u32 mthca_buddy_alloc(struct mthca_buddy *buddy, int order)
85{
86	int o;
87	int m;
88	u32 seg;
89
90	spin_lock(&buddy->lock);
91
92	for (o = order; o <= buddy->max_order; ++o)
93		if (buddy->num_free[o]) {
94			m = 1 << (buddy->max_order - o);
95			seg = find_first_bit(buddy->bits[o], m);
96			if (seg < m)
97				goto found;
98		}
99
100	spin_unlock(&buddy->lock);
101	return -1;
102
103 found:
104	clear_bit(seg, buddy->bits[o]);
105	--buddy->num_free[o];
106
107	while (o > order) {
108		--o;
109		seg <<= 1;
110		set_bit(seg ^ 1, buddy->bits[o]);
111		++buddy->num_free[o];
112	}
113
114	spin_unlock(&buddy->lock);
115
116	seg <<= order;
117
118	return seg;
119}
120
121static void mthca_buddy_free(struct mthca_buddy *buddy, u32 seg, int order)
122{
123	seg >>= order;
124
125	spin_lock(&buddy->lock);
126
127	while (test_bit(seg ^ 1, buddy->bits[order])) {
128		clear_bit(seg ^ 1, buddy->bits[order]);
129		--buddy->num_free[order];
130		seg >>= 1;
131		++order;
132	}
133
134	set_bit(seg, buddy->bits[order]);
135	++buddy->num_free[order];
136
137	spin_unlock(&buddy->lock);
138}
139
140static int mthca_buddy_init(struct mthca_buddy *buddy, int max_order)
141{
142	int i, s;
143
144	buddy->max_order = max_order;
145	spin_lock_init(&buddy->lock);
146
147	buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
148			      GFP_KERNEL);
149	buddy->num_free = kcalloc((buddy->max_order + 1), sizeof *buddy->num_free,
150				  GFP_KERNEL);
151	if (!buddy->bits || !buddy->num_free)
152		goto err_out;
153
154	for (i = 0; i <= buddy->max_order; ++i) {
155		s = BITS_TO_LONGS(1 << (buddy->max_order - i));
156		buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
157		if (!buddy->bits[i])
158			goto err_out_free;
159		bitmap_zero(buddy->bits[i],
160			    1 << (buddy->max_order - i));
161	}
162
163	set_bit(0, buddy->bits[buddy->max_order]);
164	buddy->num_free[buddy->max_order] = 1;
165
166	return 0;
167
168err_out_free:
169	for (i = 0; i <= buddy->max_order; ++i)
170		kfree(buddy->bits[i]);
171
172err_out:
173	kfree(buddy->bits);
174	kfree(buddy->num_free);
175
176	return -ENOMEM;
177}
178
179static void mthca_buddy_cleanup(struct mthca_buddy *buddy)
180{
181	int i;
182
183	for (i = 0; i <= buddy->max_order; ++i)
184		kfree(buddy->bits[i]);
185
186	kfree(buddy->bits);
187	kfree(buddy->num_free);
188}
189
190static u32 mthca_alloc_mtt_range(struct mthca_dev *dev, int order,
191				 struct mthca_buddy *buddy)
192{
193	u32 seg = mthca_buddy_alloc(buddy, order);
194
195	if (seg == -1)
196		return -1;
197
198	if (mthca_is_memfree(dev))
199		if (mthca_table_get_range(dev, dev->mr_table.mtt_table, seg,
200					  seg + (1 << order) - 1)) {
201			mthca_buddy_free(buddy, seg, order);
202			seg = -1;
203		}
204
205	return seg;
206}
207
208static struct mthca_mtt *__mthca_alloc_mtt(struct mthca_dev *dev, int size,
209					   struct mthca_buddy *buddy)
210{
211	struct mthca_mtt *mtt;
212	int i;
213
214	if (size <= 0)
215		return ERR_PTR(-EINVAL);
216
217	mtt = kmalloc(sizeof *mtt, GFP_KERNEL);
218	if (!mtt)
219		return ERR_PTR(-ENOMEM);
220
221	mtt->buddy = buddy;
222	mtt->order = 0;
223	for (i = dev->limits.mtt_seg_size / 8; i < size; i <<= 1)
224		++mtt->order;
225
226	mtt->first_seg = mthca_alloc_mtt_range(dev, mtt->order, buddy);
227	if (mtt->first_seg == -1) {
228		kfree(mtt);
229		return ERR_PTR(-ENOMEM);
230	}
231
232	return mtt;
233}
234
235struct mthca_mtt *mthca_alloc_mtt(struct mthca_dev *dev, int size)
236{
237	return __mthca_alloc_mtt(dev, size, &dev->mr_table.mtt_buddy);
238}
239
240void mthca_free_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt)
241{
242	if (!mtt)
243		return;
244
245	mthca_buddy_free(mtt->buddy, mtt->first_seg, mtt->order);
246
247	mthca_table_put_range(dev, dev->mr_table.mtt_table,
248			      mtt->first_seg,
249			      mtt->first_seg + (1 << mtt->order) - 1);
250
251	kfree(mtt);
252}
253
254static int __mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
255			     int start_index, u64 *buffer_list, int list_len)
256{
257	struct mthca_mailbox *mailbox;
258	__be64 *mtt_entry;
259	int err = 0;
260	int i;
261
262	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
263	if (IS_ERR(mailbox))
264		return PTR_ERR(mailbox);
265	mtt_entry = mailbox->buf;
266
267	while (list_len > 0) {
268		mtt_entry[0] = cpu_to_be64(dev->mr_table.mtt_base +
269					   mtt->first_seg * dev->limits.mtt_seg_size +
270					   start_index * 8);
271		mtt_entry[1] = 0;
272		for (i = 0; i < list_len && i < MTHCA_MAILBOX_SIZE / 8 - 2; ++i)
273			mtt_entry[i + 2] = cpu_to_be64(buffer_list[i] |
274						       MTHCA_MTT_FLAG_PRESENT);
275
276		/*
277		 * If we have an odd number of entries to write, add
278		 * one more dummy entry for firmware efficiency.
279		 */
280		if (i & 1)
281			mtt_entry[i + 2] = 0;
282
283		err = mthca_WRITE_MTT(dev, mailbox, (i + 1) & ~1);
284		if (err) {
285			mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
286			goto out;
287		}
288
289		list_len    -= i;
290		start_index += i;
291		buffer_list += i;
292	}
293
294out:
295	mthca_free_mailbox(dev, mailbox);
296	return err;
297}
298
299int mthca_write_mtt_size(struct mthca_dev *dev)
300{
301	if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
302	    !(dev->mthca_flags & MTHCA_FLAG_FMR))
303		/*
304		 * Be friendly to WRITE_MTT command
305		 * and leave two empty slots for the
306		 * index and reserved fields of the
307		 * mailbox.
308		 */
309		return PAGE_SIZE / sizeof (u64) - 2;
310
311	/* For Arbel, all MTTs must fit in the same page. */
312	return mthca_is_memfree(dev) ? (PAGE_SIZE / sizeof (u64)) : 0x7ffffff;
313}
314
315static void mthca_tavor_write_mtt_seg(struct mthca_dev *dev,
316				      struct mthca_mtt *mtt, int start_index,
317				      u64 *buffer_list, int list_len)
318{
319	u64 __iomem *mtts;
320	int i;
321
322	mtts = dev->mr_table.tavor_fmr.mtt_base + mtt->first_seg * dev->limits.mtt_seg_size +
323		start_index * sizeof (u64);
324	for (i = 0; i < list_len; ++i)
325		mthca_write64_raw(cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT),
326				  mtts + i);
327}
328
329static void mthca_arbel_write_mtt_seg(struct mthca_dev *dev,
330				      struct mthca_mtt *mtt, int start_index,
331				      u64 *buffer_list, int list_len)
332{
333	__be64 *mtts;
334	dma_addr_t dma_handle;
335	int i;
336	int s = start_index * sizeof (u64);
337
338	/* For Arbel, all MTTs must fit in the same page. */
339	BUG_ON(s / PAGE_SIZE != (s + list_len * sizeof(u64) - 1) / PAGE_SIZE);
340	/* Require full segments */
341	BUG_ON(s % dev->limits.mtt_seg_size);
342
343	mtts = mthca_table_find(dev->mr_table.mtt_table, mtt->first_seg +
344				s / dev->limits.mtt_seg_size, &dma_handle);
345
346	BUG_ON(!mtts);
347
348	dma_sync_single_for_cpu(&dev->pdev->dev, dma_handle,
349				list_len * sizeof (u64), DMA_TO_DEVICE);
350
351	for (i = 0; i < list_len; ++i)
352		mtts[i] = cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT);
353
354	dma_sync_single_for_device(&dev->pdev->dev, dma_handle,
355				   list_len * sizeof (u64), DMA_TO_DEVICE);
356}
357
358int mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
359		    int start_index, u64 *buffer_list, int list_len)
360{
361	int size = mthca_write_mtt_size(dev);
362	int chunk;
363
364	if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
365	    !(dev->mthca_flags & MTHCA_FLAG_FMR))
366		return __mthca_write_mtt(dev, mtt, start_index, buffer_list, list_len);
367
368	while (list_len > 0) {
369		chunk = min(size, list_len);
370		if (mthca_is_memfree(dev))
371			mthca_arbel_write_mtt_seg(dev, mtt, start_index,
372						  buffer_list, chunk);
373		else
374			mthca_tavor_write_mtt_seg(dev, mtt, start_index,
375						  buffer_list, chunk);
376
377		list_len    -= chunk;
378		start_index += chunk;
379		buffer_list += chunk;
380	}
381
382	return 0;
383}
384
385static inline u32 tavor_hw_index_to_key(u32 ind)
386{
387	return ind;
388}
389
390static inline u32 tavor_key_to_hw_index(u32 key)
391{
392	return key;
393}
394
395static inline u32 arbel_hw_index_to_key(u32 ind)
396{
397	return (ind >> 24) | (ind << 8);
398}
399
400static inline u32 arbel_key_to_hw_index(u32 key)
401{
402	return (key << 24) | (key >> 8);
403}
404
405static inline u32 hw_index_to_key(struct mthca_dev *dev, u32 ind)
406{
407	if (mthca_is_memfree(dev))
408		return arbel_hw_index_to_key(ind);
409	else
410		return tavor_hw_index_to_key(ind);
411}
412
413static inline u32 key_to_hw_index(struct mthca_dev *dev, u32 key)
414{
415	if (mthca_is_memfree(dev))
416		return arbel_key_to_hw_index(key);
417	else
418		return tavor_key_to_hw_index(key);
419}
420
421static inline u32 adjust_key(struct mthca_dev *dev, u32 key)
422{
423	if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
424		return ((key << 20) & 0x800000) | (key & 0x7fffff);
425	else
426		return key;
427}
428
429int mthca_mr_alloc(struct mthca_dev *dev, u32 pd, int buffer_size_shift,
430		   u64 iova, u64 total_size, u32 access, struct mthca_mr *mr)
431{
432	struct mthca_mailbox *mailbox;
433	struct mthca_mpt_entry *mpt_entry;
434	u32 key;
435	int i;
436	int err;
437
438	WARN_ON(buffer_size_shift >= 32);
439
440	key = mthca_alloc(&dev->mr_table.mpt_alloc);
441	if (key == -1)
442		return -ENOMEM;
443	key = adjust_key(dev, key);
444	mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
445
446	if (mthca_is_memfree(dev)) {
447		err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
448		if (err)
449			goto err_out_mpt_free;
450	}
451
452	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
453	if (IS_ERR(mailbox)) {
454		err = PTR_ERR(mailbox);
455		goto err_out_table;
456	}
457	mpt_entry = mailbox->buf;
458
459	mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
460				       MTHCA_MPT_FLAG_MIO         |
461				       MTHCA_MPT_FLAG_REGION      |
462				       access);
463	if (!mr->mtt)
464		mpt_entry->flags |= cpu_to_be32(MTHCA_MPT_FLAG_PHYSICAL);
465
466	mpt_entry->page_size = cpu_to_be32(buffer_size_shift - 12);
467	mpt_entry->key       = cpu_to_be32(key);
468	mpt_entry->pd        = cpu_to_be32(pd);
469	mpt_entry->start     = cpu_to_be64(iova);
470	mpt_entry->length    = cpu_to_be64(total_size);
471
472	memset(&mpt_entry->lkey, 0,
473	       sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
474
475	if (mr->mtt)
476		mpt_entry->mtt_seg =
477			cpu_to_be64(dev->mr_table.mtt_base +
478				    mr->mtt->first_seg * dev->limits.mtt_seg_size);
479
480	if (0) {
481		mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
482		for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
483			if (i % 4 == 0)
484				printk("[%02x] ", i * 4);
485			printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
486			if ((i + 1) % 4 == 0)
487				printk("\n");
488		}
489	}
490
491	err = mthca_SW2HW_MPT(dev, mailbox,
492			      key & (dev->limits.num_mpts - 1));
493	if (err) {
494		mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
495		goto err_out_mailbox;
496	}
497
498	mthca_free_mailbox(dev, mailbox);
499	return err;
500
501err_out_mailbox:
502	mthca_free_mailbox(dev, mailbox);
503
504err_out_table:
505	mthca_table_put(dev, dev->mr_table.mpt_table, key);
506
507err_out_mpt_free:
508	mthca_free(&dev->mr_table.mpt_alloc, key);
509	return err;
510}
511
512int mthca_mr_alloc_notrans(struct mthca_dev *dev, u32 pd,
513			   u32 access, struct mthca_mr *mr)
514{
515	mr->mtt = NULL;
516	return mthca_mr_alloc(dev, pd, 12, 0, ~0ULL, access, mr);
517}
518
519int mthca_mr_alloc_phys(struct mthca_dev *dev, u32 pd,
520			u64 *buffer_list, int buffer_size_shift,
521			int list_len, u64 iova, u64 total_size,
522			u32 access, struct mthca_mr *mr)
523{
524	int err;
525
526	mr->mtt = mthca_alloc_mtt(dev, list_len);
527	if (IS_ERR(mr->mtt))
528		return PTR_ERR(mr->mtt);
529
530	err = mthca_write_mtt(dev, mr->mtt, 0, buffer_list, list_len);
531	if (err) {
532		mthca_free_mtt(dev, mr->mtt);
533		return err;
534	}
535
536	err = mthca_mr_alloc(dev, pd, buffer_size_shift, iova,
537			     total_size, access, mr);
538	if (err)
539		mthca_free_mtt(dev, mr->mtt);
540
541	return err;
542}
543
544/* Free mr or fmr */
545static void mthca_free_region(struct mthca_dev *dev, u32 lkey)
546{
547	mthca_table_put(dev, dev->mr_table.mpt_table,
548			key_to_hw_index(dev, lkey));
549
550	mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, lkey));
551}
552
553void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
554{
555	int err;
556
557	err = mthca_HW2SW_MPT(dev, NULL,
558			      key_to_hw_index(dev, mr->ibmr.lkey) &
559			      (dev->limits.num_mpts - 1));
560	if (err)
561		mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
562
563	mthca_free_region(dev, mr->ibmr.lkey);
564	mthca_free_mtt(dev, mr->mtt);
565}
566
567int mthca_fmr_alloc(struct mthca_dev *dev, u32 pd,
568		    u32 access, struct mthca_fmr *mr)
569{
570	struct mthca_mpt_entry *mpt_entry;
571	struct mthca_mailbox *mailbox;
572	u64 mtt_seg;
573	u32 key, idx;
574	int list_len = mr->attr.max_pages;
575	int err = -ENOMEM;
576	int i;
577
578	if (mr->attr.page_shift < 12 || mr->attr.page_shift >= 32)
579		return -EINVAL;
580
581	/* For Arbel, all MTTs must fit in the same page. */
582	if (mthca_is_memfree(dev) &&
583	    mr->attr.max_pages * sizeof *mr->mem.arbel.mtts > PAGE_SIZE)
584		return -EINVAL;
585
586	mr->maps = 0;
587
588	key = mthca_alloc(&dev->mr_table.mpt_alloc);
589	if (key == -1)
590		return -ENOMEM;
591	key = adjust_key(dev, key);
592
593	idx = key & (dev->limits.num_mpts - 1);
594	mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
595
596	if (mthca_is_memfree(dev)) {
597		err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
598		if (err)
599			goto err_out_mpt_free;
600
601		mr->mem.arbel.mpt = mthca_table_find(dev->mr_table.mpt_table, key, NULL);
602		BUG_ON(!mr->mem.arbel.mpt);
603	} else
604		mr->mem.tavor.mpt = dev->mr_table.tavor_fmr.mpt_base +
605			sizeof *(mr->mem.tavor.mpt) * idx;
606
607	mr->mtt = __mthca_alloc_mtt(dev, list_len, dev->mr_table.fmr_mtt_buddy);
608	if (IS_ERR(mr->mtt)) {
609		err = PTR_ERR(mr->mtt);
610		goto err_out_table;
611	}
612
613	mtt_seg = mr->mtt->first_seg * dev->limits.mtt_seg_size;
614
615	if (mthca_is_memfree(dev)) {
616		mr->mem.arbel.mtts = mthca_table_find(dev->mr_table.mtt_table,
617						      mr->mtt->first_seg,
618						      &mr->mem.arbel.dma_handle);
619		BUG_ON(!mr->mem.arbel.mtts);
620	} else
621		mr->mem.tavor.mtts = dev->mr_table.tavor_fmr.mtt_base + mtt_seg;
622
623	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
624	if (IS_ERR(mailbox)) {
625		err = PTR_ERR(mailbox);
626		goto err_out_free_mtt;
627	}
628
629	mpt_entry = mailbox->buf;
630
631	mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
632				       MTHCA_MPT_FLAG_MIO         |
633				       MTHCA_MPT_FLAG_REGION      |
634				       access);
635
636	mpt_entry->page_size = cpu_to_be32(mr->attr.page_shift - 12);
637	mpt_entry->key       = cpu_to_be32(key);
638	mpt_entry->pd        = cpu_to_be32(pd);
639	memset(&mpt_entry->start, 0,
640	       sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, start));
641	mpt_entry->mtt_seg   = cpu_to_be64(dev->mr_table.mtt_base + mtt_seg);
642
643	if (0) {
644		mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
645		for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
646			if (i % 4 == 0)
647				printk("[%02x] ", i * 4);
648			printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
649			if ((i + 1) % 4 == 0)
650				printk("\n");
651		}
652	}
653
654	err = mthca_SW2HW_MPT(dev, mailbox,
655			      key & (dev->limits.num_mpts - 1));
656	if (err) {
657		mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
658		goto err_out_mailbox_free;
659	}
660
661	mthca_free_mailbox(dev, mailbox);
662	return 0;
663
664err_out_mailbox_free:
665	mthca_free_mailbox(dev, mailbox);
666
667err_out_free_mtt:
668	mthca_free_mtt(dev, mr->mtt);
669
670err_out_table:
671	mthca_table_put(dev, dev->mr_table.mpt_table, key);
672
673err_out_mpt_free:
674	mthca_free(&dev->mr_table.mpt_alloc, key);
675	return err;
676}
677
678int mthca_free_fmr(struct mthca_dev *dev, struct mthca_fmr *fmr)
679{
680	if (fmr->maps)
681		return -EBUSY;
682
683	mthca_free_region(dev, fmr->ibmr.lkey);
684	mthca_free_mtt(dev, fmr->mtt);
685
686	return 0;
687}
688
689static inline int mthca_check_fmr(struct mthca_fmr *fmr, u64 *page_list,
690				  int list_len, u64 iova)
691{
692	int i, page_mask;
693
694	if (list_len > fmr->attr.max_pages)
695		return -EINVAL;
696
697	page_mask = (1 << fmr->attr.page_shift) - 1;
698
699	/* We are getting page lists, so va must be page aligned. */
700	if (iova & page_mask)
701		return -EINVAL;
702
703	/* Trust the user not to pass misaligned data in page_list */
704	if (0)
705		for (i = 0; i < list_len; ++i) {
706			if (page_list[i] & ~page_mask)
707				return -EINVAL;
708		}
709
710	if (fmr->maps >= fmr->attr.max_maps)
711		return -EINVAL;
712
713	return 0;
714}
715
716
717int mthca_tavor_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
718			     int list_len, u64 iova)
719{
720	struct mthca_fmr *fmr = to_mfmr(ibfmr);
721	struct mthca_dev *dev = to_mdev(ibfmr->device);
722	struct mthca_mpt_entry mpt_entry;
723	u32 key;
724	int i, err;
725
726	err = mthca_check_fmr(fmr, page_list, list_len, iova);
727	if (err)
728		return err;
729
730	++fmr->maps;
731
732	key = tavor_key_to_hw_index(fmr->ibmr.lkey);
733	key += dev->limits.num_mpts;
734	fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);
735
736	writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);
737
738	for (i = 0; i < list_len; ++i) {
739		__be64 mtt_entry = cpu_to_be64(page_list[i] |
740					       MTHCA_MTT_FLAG_PRESENT);
741		mthca_write64_raw(mtt_entry, fmr->mem.tavor.mtts + i);
742	}
743
744	mpt_entry.lkey   = cpu_to_be32(key);
745	mpt_entry.length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
746	mpt_entry.start  = cpu_to_be64(iova);
747
748	__raw_writel((__force u32) mpt_entry.lkey, &fmr->mem.tavor.mpt->key);
749	memcpy_toio(&fmr->mem.tavor.mpt->start, &mpt_entry.start,
750		    offsetof(struct mthca_mpt_entry, window_count) -
751		    offsetof(struct mthca_mpt_entry, start));
752
753	writeb(MTHCA_MPT_STATUS_HW, fmr->mem.tavor.mpt);
754
755	return 0;
756}
757
758int mthca_arbel_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
759			     int list_len, u64 iova)
760{
761	struct mthca_fmr *fmr = to_mfmr(ibfmr);
762	struct mthca_dev *dev = to_mdev(ibfmr->device);
763	u32 key;
764	int i, err;
765
766	err = mthca_check_fmr(fmr, page_list, list_len, iova);
767	if (err)
768		return err;
769
770	++fmr->maps;
771
772	key = arbel_key_to_hw_index(fmr->ibmr.lkey);
773	if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
774		key += SINAI_FMR_KEY_INC;
775	else
776		key += dev->limits.num_mpts;
777	fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);
778
779	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;
780
781	wmb();
782
783	dma_sync_single_for_cpu(&dev->pdev->dev, fmr->mem.arbel.dma_handle,
784				list_len * sizeof(u64), DMA_TO_DEVICE);
785
786	for (i = 0; i < list_len; ++i)
787		fmr->mem.arbel.mtts[i] = cpu_to_be64(page_list[i] |
788						     MTHCA_MTT_FLAG_PRESENT);
789
790	dma_sync_single_for_device(&dev->pdev->dev, fmr->mem.arbel.dma_handle,
791				   list_len * sizeof(u64), DMA_TO_DEVICE);
792
793	fmr->mem.arbel.mpt->key    = cpu_to_be32(key);
794	fmr->mem.arbel.mpt->lkey   = cpu_to_be32(key);
795	fmr->mem.arbel.mpt->length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
796	fmr->mem.arbel.mpt->start  = cpu_to_be64(iova);
797
798	wmb();
799
800	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_HW;
801
802	wmb();
803
804	return 0;
805}
806
807void mthca_tavor_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
808{
809	if (!fmr->maps)
810		return;
811
812	fmr->maps = 0;
813
814	writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);
815}
816
817void mthca_arbel_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
818{
819	if (!fmr->maps)
820		return;
821
822	fmr->maps = 0;
823
824	*(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;
825}
826
827int mthca_init_mr_table(struct mthca_dev *dev)
828{
829	phys_addr_t addr;
830	int mpts, mtts, err, i;
831
832	err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
833			       dev->limits.num_mpts,
834			       ~0, dev->limits.reserved_mrws);
835	if (err)
836		return err;
837
838	if (!mthca_is_memfree(dev) &&
839	    (dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN))
840		dev->limits.fmr_reserved_mtts = 0;
841	else
842		dev->mthca_flags |= MTHCA_FLAG_FMR;
843
844	if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
845		mthca_dbg(dev, "Memory key throughput optimization activated.\n");
846
847	err = mthca_buddy_init(&dev->mr_table.mtt_buddy,
848			       fls(dev->limits.num_mtt_segs - 1));
849
850	if (err)
851		goto err_mtt_buddy;
852
853	dev->mr_table.tavor_fmr.mpt_base = NULL;
854	dev->mr_table.tavor_fmr.mtt_base = NULL;
855
856	if (dev->limits.fmr_reserved_mtts) {
857		i = fls(dev->limits.fmr_reserved_mtts - 1);
858
859		if (i >= 31) {
860			mthca_warn(dev, "Unable to reserve 2^31 FMR MTTs.\n");
861			err = -EINVAL;
862			goto err_fmr_mpt;
863		}
864		mpts = mtts = 1 << i;
865	} else {
866		mtts = dev->limits.num_mtt_segs;
867		mpts = dev->limits.num_mpts;
868	}
869
870	if (!mthca_is_memfree(dev) &&
871	    (dev->mthca_flags & MTHCA_FLAG_FMR)) {
872
873		addr = pci_resource_start(dev->pdev, 4) +
874			((pci_resource_len(dev->pdev, 4) - 1) &
875			 dev->mr_table.mpt_base);
876
877		dev->mr_table.tavor_fmr.mpt_base =
878			ioremap(addr, mpts * sizeof(struct mthca_mpt_entry));
879
880		if (!dev->mr_table.tavor_fmr.mpt_base) {
881			mthca_warn(dev, "MPT ioremap for FMR failed.\n");
882			err = -ENOMEM;
883			goto err_fmr_mpt;
884		}
885
886		addr = pci_resource_start(dev->pdev, 4) +
887			((pci_resource_len(dev->pdev, 4) - 1) &
888			 dev->mr_table.mtt_base);
889
890		dev->mr_table.tavor_fmr.mtt_base =
891			ioremap(addr, mtts * dev->limits.mtt_seg_size);
892		if (!dev->mr_table.tavor_fmr.mtt_base) {
893			mthca_warn(dev, "MTT ioremap for FMR failed.\n");
894			err = -ENOMEM;
895			goto err_fmr_mtt;
896		}
897	}
898
899	if (dev->limits.fmr_reserved_mtts) {
900		err = mthca_buddy_init(&dev->mr_table.tavor_fmr.mtt_buddy, fls(mtts - 1));
901		if (err)
902			goto err_fmr_mtt_buddy;
903
904		/* Prevent regular MRs from using FMR keys */
905		err = mthca_buddy_alloc(&dev->mr_table.mtt_buddy, fls(mtts - 1));
906		if (err)
907			goto err_reserve_fmr;
908
909		dev->mr_table.fmr_mtt_buddy =
910			&dev->mr_table.tavor_fmr.mtt_buddy;
911	} else
912		dev->mr_table.fmr_mtt_buddy = &dev->mr_table.mtt_buddy;
913
914	/* FMR table is always the first, take reserved MTTs out of there */
915	if (dev->limits.reserved_mtts) {
916		i = fls(dev->limits.reserved_mtts - 1);
917
918		if (mthca_alloc_mtt_range(dev, i,
919					  dev->mr_table.fmr_mtt_buddy) == -1) {
920			mthca_warn(dev, "MTT table of order %d is too small.\n",
921				  dev->mr_table.fmr_mtt_buddy->max_order);
922			err = -ENOMEM;
923			goto err_reserve_mtts;
924		}
925	}
926
927	return 0;
928
929err_reserve_mtts:
930err_reserve_fmr:
931	if (dev->limits.fmr_reserved_mtts)
932		mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);
933
934err_fmr_mtt_buddy:
935	if (dev->mr_table.tavor_fmr.mtt_base)
936		iounmap(dev->mr_table.tavor_fmr.mtt_base);
937
938err_fmr_mtt:
939	if (dev->mr_table.tavor_fmr.mpt_base)
940		iounmap(dev->mr_table.tavor_fmr.mpt_base);
941
942err_fmr_mpt:
943	mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);
944
945err_mtt_buddy:
946	mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
947
948	return err;
949}
950
951void mthca_cleanup_mr_table(struct mthca_dev *dev)
952{
953	/* XXX check if any MRs are still allocated? */
954	if (dev->limits.fmr_reserved_mtts)
955		mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);
956
957	mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);
958
959	if (dev->mr_table.tavor_fmr.mtt_base)
960		iounmap(dev->mr_table.tavor_fmr.mtt_base);
961	if (dev->mr_table.tavor_fmr.mpt_base)
962		iounmap(dev->mr_table.tavor_fmr.mpt_base);
963
964	mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
965}
966