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1/*
2 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2006, 2007 Cisco Systems, Inc. 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/errno.h>
35#include <linux/mm.h>
36#include <linux/scatterlist.h>
37#include <linux/slab.h>
38
39#include <linux/mlx4/cmd.h>
40
41#include "mlx4.h"
42#include "icm.h"
43#include "fw.h"
44
45/*
46 * We allocate in as big chunks as we can, up to a maximum of 256 KB
47 * per chunk.
48 */
49enum {
50 MLX4_ICM_ALLOC_SIZE = 1 << 18,
51 MLX4_TABLE_CHUNK_SIZE = 1 << 18
52};
53
54static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
55{
56 int i;
57
58 if (chunk->nsg > 0)
59 pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
60 PCI_DMA_BIDIRECTIONAL);
61
62 for (i = 0; i < chunk->npages; ++i)
63 __free_pages(sg_page(&chunk->mem[i]),
64 get_order(chunk->mem[i].length));
65}
66
67static void mlx4_free_icm_coherent(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
68{
69 int i;
70
71 for (i = 0; i < chunk->npages; ++i)
72 dma_free_coherent(&dev->pdev->dev, chunk->mem[i].length,
73 lowmem_page_address(sg_page(&chunk->mem[i])),
74 sg_dma_address(&chunk->mem[i]));
75}
76
77void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent)
78{
79 struct mlx4_icm_chunk *chunk, *tmp;
80
81 if (!icm)
82 return;
83
84 list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
85 if (coherent)
86 mlx4_free_icm_coherent(dev, chunk);
87 else
88 mlx4_free_icm_pages(dev, chunk);
89
90 kfree(chunk);
91 }
92
93 kfree(icm);
94}
95
96static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order, gfp_t gfp_mask)
97{
98 struct page *page;
99
100 page = alloc_pages(gfp_mask, order);
101 if (!page)
102 return -ENOMEM;
103
104 sg_set_page(mem, page, PAGE_SIZE << order, 0);
105 return 0;
106}
107
108static int mlx4_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
109 int order, gfp_t gfp_mask)
110{
111 void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order,
112 &sg_dma_address(mem), gfp_mask);
113 if (!buf)
114 return -ENOMEM;
115
116 sg_set_buf(mem, buf, PAGE_SIZE << order);
117 BUG_ON(mem->offset);
118 sg_dma_len(mem) = PAGE_SIZE << order;
119 return 0;
120}
121
122struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
123 gfp_t gfp_mask, int coherent)
124{
125 struct mlx4_icm *icm;
126 struct mlx4_icm_chunk *chunk = NULL;
127 int cur_order;
128 int ret;
129
130 /* We use sg_set_buf for coherent allocs, which assumes low memory */
131 BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
132
133 icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
134 if (!icm)
135 return NULL;
136
137 icm->refcount = 0;
138 INIT_LIST_HEAD(&icm->chunk_list);
139
140 cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
141
142 while (npages > 0) {
143 if (!chunk) {
144 chunk = kmalloc(sizeof *chunk,
145 gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
146 if (!chunk)
147 goto fail;
148
149 sg_init_table(chunk->mem, MLX4_ICM_CHUNK_LEN);
150 chunk->npages = 0;
151 chunk->nsg = 0;
152 list_add_tail(&chunk->list, &icm->chunk_list);
153 }
154
155 while (1 << cur_order > npages)
156 --cur_order;
157
158 if (coherent)
159 ret = mlx4_alloc_icm_coherent(&dev->pdev->dev,
160 &chunk->mem[chunk->npages],
161 cur_order, gfp_mask);
162 else
163 ret = mlx4_alloc_icm_pages(&chunk->mem[chunk->npages],
164 cur_order, gfp_mask);
165
166 if (ret) {
167 if (--cur_order < 0)
168 goto fail;
169 else
170 continue;
171 }
172
173 ++chunk->npages;
174
175 if (coherent)
176 ++chunk->nsg;
177 else if (chunk->npages == MLX4_ICM_CHUNK_LEN) {
178 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
179 chunk->npages,
180 PCI_DMA_BIDIRECTIONAL);
181
182 if (chunk->nsg <= 0)
183 goto fail;
184 }
185
186 if (chunk->npages == MLX4_ICM_CHUNK_LEN)
187 chunk = NULL;
188
189 npages -= 1 << cur_order;
190 }
191
192 if (!coherent && chunk) {
193 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
194 chunk->npages,
195 PCI_DMA_BIDIRECTIONAL);
196
197 if (chunk->nsg <= 0)
198 goto fail;
199 }
200
201 return icm;
202
203fail:
204 mlx4_free_icm(dev, icm, coherent);
205 return NULL;
206}
207
208static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
209{
210 return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
211}
212
213static int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
214{
215 return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
216 MLX4_CMD_TIME_CLASS_B);
217}
218
219int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
220{
221 return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
222}
223
224int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
225{
226 return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX, MLX4_CMD_TIME_CLASS_B);
227}
228
229int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
230{
231 int i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
232 int ret = 0;
233
234 mutex_lock(&table->mutex);
235
236 if (table->icm[i]) {
237 ++table->icm[i]->refcount;
238 goto out;
239 }
240
241 table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
242 (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
243 __GFP_NOWARN, table->coherent);
244 if (!table->icm[i]) {
245 ret = -ENOMEM;
246 goto out;
247 }
248
249 if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
250 (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
251 mlx4_free_icm(dev, table->icm[i], table->coherent);
252 table->icm[i] = NULL;
253 ret = -ENOMEM;
254 goto out;
255 }
256
257 ++table->icm[i]->refcount;
258
259out:
260 mutex_unlock(&table->mutex);
261 return ret;
262}
263
264void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
265{
266 int i;
267
268 i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
269
270 mutex_lock(&table->mutex);
271
272 if (--table->icm[i]->refcount == 0) {
273 mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
274 MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
275 mlx4_free_icm(dev, table->icm[i], table->coherent);
276 table->icm[i] = NULL;
277 }
278
279 mutex_unlock(&table->mutex);
280}
281
282void *mlx4_table_find(struct mlx4_icm_table *table, int obj, dma_addr_t *dma_handle)
283{
284 int idx, offset, dma_offset, i;
285 struct mlx4_icm_chunk *chunk;
286 struct mlx4_icm *icm;
287 struct page *page = NULL;
288
289 if (!table->lowmem)
290 return NULL;
291
292 mutex_lock(&table->mutex);
293
294 idx = (obj & (table->num_obj - 1)) * table->obj_size;
295 icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
296 dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
297
298 if (!icm)
299 goto out;
300
301 list_for_each_entry(chunk, &icm->chunk_list, list) {
302 for (i = 0; i < chunk->npages; ++i) {
303 if (dma_handle && dma_offset >= 0) {
304 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
305 *dma_handle = sg_dma_address(&chunk->mem[i]) +
306 dma_offset;
307 dma_offset -= sg_dma_len(&chunk->mem[i]);
308 }
309 /*
310 * DMA mapping can merge pages but not split them,
311 * so if we found the page, dma_handle has already
312 * been assigned to.
313 */
314 if (chunk->mem[i].length > offset) {
315 page = sg_page(&chunk->mem[i]);
316 goto out;
317 }
318 offset -= chunk->mem[i].length;
319 }
320 }
321
322out:
323 mutex_unlock(&table->mutex);
324 return page ? lowmem_page_address(page) + offset : NULL;
325}
326
327int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
328 int start, int end)
329{
330 int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
331 int i, err;
332
333 for (i = start; i <= end; i += inc) {
334 err = mlx4_table_get(dev, table, i);
335 if (err)
336 goto fail;
337 }
338
339 return 0;
340
341fail:
342 while (i > start) {
343 i -= inc;
344 mlx4_table_put(dev, table, i);
345 }
346
347 return err;
348}
349
350void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
351 int start, int end)
352{
353 int i;
354
355 for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
356 mlx4_table_put(dev, table, i);
357}
358
359int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
360 u64 virt, int obj_size, int nobj, int reserved,
361 int use_lowmem, int use_coherent)
362{
363 int obj_per_chunk;
364 int num_icm;
365 unsigned chunk_size;
366 int i;
367
368 obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
369 num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
370
371 table->icm = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
372 if (!table->icm)
373 return -ENOMEM;
374 table->virt = virt;
375 table->num_icm = num_icm;
376 table->num_obj = nobj;
377 table->obj_size = obj_size;
378 table->lowmem = use_lowmem;
379 table->coherent = use_coherent;
380 mutex_init(&table->mutex);
381
382 for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
383 chunk_size = MLX4_TABLE_CHUNK_SIZE;
384 if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > nobj * obj_size)
385 chunk_size = PAGE_ALIGN(nobj * obj_size - i * MLX4_TABLE_CHUNK_SIZE);
386
387 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
388 (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
389 __GFP_NOWARN, use_coherent);
390 if (!table->icm[i])
391 goto err;
392 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
393 mlx4_free_icm(dev, table->icm[i], use_coherent);
394 table->icm[i] = NULL;
395 goto err;
396 }
397
398 /*
399 * Add a reference to this ICM chunk so that it never
400 * gets freed (since it contains reserved firmware objects).
401 */
402 ++table->icm[i]->refcount;
403 }
404
405 return 0;
406
407err:
408 for (i = 0; i < num_icm; ++i)
409 if (table->icm[i]) {
410 mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
411 MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
412 mlx4_free_icm(dev, table->icm[i], use_coherent);
413 }
414
415 return -ENOMEM;
416}
417
418void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
419{
420 int i;
421
422 for (i = 0; i < table->num_icm; ++i)
423 if (table->icm[i]) {
424 mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
425 MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
426 mlx4_free_icm(dev, table->icm[i], table->coherent);
427 }
428
429 kfree(table->icm);
430}