Merge branch 'juju' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux13...
[linux-2.6] / drivers / net / mlx4 / icm.c
1 /*
2  * Copyright (c) 2005 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/init.h>
35 #include <linux/errno.h>
36
37 #include <linux/mlx4/cmd.h>
38
39 #include "mlx4.h"
40 #include "icm.h"
41 #include "fw.h"
42
43 /*
44  * We allocate in as big chunks as we can, up to a maximum of 256 KB
45  * per chunk.
46  */
47 enum {
48         MLX4_ICM_ALLOC_SIZE     = 1 << 18,
49         MLX4_TABLE_CHUNK_SIZE   = 1 << 18
50 };
51
52 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm)
53 {
54         struct mlx4_icm_chunk *chunk, *tmp;
55         int i;
56
57         list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
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(chunk->mem[i].page,
64                                      get_order(chunk->mem[i].length));
65
66                 kfree(chunk);
67         }
68
69         kfree(icm);
70 }
71
72 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
73                                 gfp_t gfp_mask)
74 {
75         struct mlx4_icm *icm;
76         struct mlx4_icm_chunk *chunk = NULL;
77         int cur_order;
78
79         icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
80         if (!icm)
81                 return icm;
82
83         icm->refcount = 0;
84         INIT_LIST_HEAD(&icm->chunk_list);
85
86         cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
87
88         while (npages > 0) {
89                 if (!chunk) {
90                         chunk = kmalloc(sizeof *chunk,
91                                         gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
92                         if (!chunk)
93                                 goto fail;
94
95                         chunk->npages = 0;
96                         chunk->nsg    = 0;
97                         list_add_tail(&chunk->list, &icm->chunk_list);
98                 }
99
100                 while (1 << cur_order > npages)
101                         --cur_order;
102
103                 chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order);
104                 if (chunk->mem[chunk->npages].page) {
105                         chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order;
106                         chunk->mem[chunk->npages].offset = 0;
107
108                         if (++chunk->npages == MLX4_ICM_CHUNK_LEN) {
109                                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
110                                                         chunk->npages,
111                                                         PCI_DMA_BIDIRECTIONAL);
112
113                                 if (chunk->nsg <= 0)
114                                         goto fail;
115
116                                 chunk = NULL;
117                         }
118
119                         npages -= 1 << cur_order;
120                 } else {
121                         --cur_order;
122                         if (cur_order < 0)
123                                 goto fail;
124                 }
125         }
126
127         if (chunk) {
128                 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
129                                         chunk->npages,
130                                         PCI_DMA_BIDIRECTIONAL);
131
132                 if (chunk->nsg <= 0)
133                         goto fail;
134         }
135
136         return icm;
137
138 fail:
139         mlx4_free_icm(dev, icm);
140         return NULL;
141 }
142
143 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
144 {
145         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
146 }
147
148 int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
149 {
150         return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
151                         MLX4_CMD_TIME_CLASS_B);
152 }
153
154 int mlx4_MAP_ICM_page(struct mlx4_dev *dev, u64 dma_addr, u64 virt)
155 {
156         struct mlx4_cmd_mailbox *mailbox;
157         __be64 *inbox;
158         int err;
159
160         mailbox = mlx4_alloc_cmd_mailbox(dev);
161         if (IS_ERR(mailbox))
162                 return PTR_ERR(mailbox);
163         inbox = mailbox->buf;
164
165         inbox[0] = cpu_to_be64(virt);
166         inbox[1] = cpu_to_be64(dma_addr);
167
168         err = mlx4_cmd(dev, mailbox->dma, 1, 0, MLX4_CMD_MAP_ICM,
169                        MLX4_CMD_TIME_CLASS_B);
170
171         mlx4_free_cmd_mailbox(dev, mailbox);
172
173         if (!err)
174                 mlx4_dbg(dev, "Mapped page at %llx to %llx for ICM.\n",
175                           (unsigned long long) dma_addr, (unsigned long long) virt);
176
177         return err;
178 }
179
180 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
181 {
182         return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
183 }
184
185 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
186 {
187         return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX, MLX4_CMD_TIME_CLASS_B);
188 }
189
190 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
191 {
192         int i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
193         int ret = 0;
194
195         mutex_lock(&table->mutex);
196
197         if (table->icm[i]) {
198                 ++table->icm[i]->refcount;
199                 goto out;
200         }
201
202         table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
203                                        (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
204                                        __GFP_NOWARN);
205         if (!table->icm[i]) {
206                 ret = -ENOMEM;
207                 goto out;
208         }
209
210         if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
211                          (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
212                 mlx4_free_icm(dev, table->icm[i]);
213                 table->icm[i] = NULL;
214                 ret = -ENOMEM;
215                 goto out;
216         }
217
218         ++table->icm[i]->refcount;
219
220 out:
221         mutex_unlock(&table->mutex);
222         return ret;
223 }
224
225 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
226 {
227         int i;
228
229         i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
230
231         mutex_lock(&table->mutex);
232
233         if (--table->icm[i]->refcount == 0) {
234                 mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
235                                MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
236                 mlx4_free_icm(dev, table->icm[i]);
237                 table->icm[i] = NULL;
238         }
239
240         mutex_unlock(&table->mutex);
241 }
242
243 void *mlx4_table_find(struct mlx4_icm_table *table, int obj)
244 {
245         int idx, offset, i;
246         struct mlx4_icm_chunk *chunk;
247         struct mlx4_icm *icm;
248         struct page *page = NULL;
249
250         if (!table->lowmem)
251                 return NULL;
252
253         mutex_lock(&table->mutex);
254
255         idx = obj & (table->num_obj - 1);
256         icm = table->icm[idx / (MLX4_TABLE_CHUNK_SIZE / table->obj_size)];
257         offset = idx % (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
258
259         if (!icm)
260                 goto out;
261
262         list_for_each_entry(chunk, &icm->chunk_list, list) {
263                 for (i = 0; i < chunk->npages; ++i) {
264                         if (chunk->mem[i].length > offset) {
265                                 page = chunk->mem[i].page;
266                                 goto out;
267                         }
268                         offset -= chunk->mem[i].length;
269                 }
270         }
271
272 out:
273         mutex_unlock(&table->mutex);
274         return page ? lowmem_page_address(page) + offset : NULL;
275 }
276
277 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
278                          int start, int end)
279 {
280         int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
281         int i, err;
282
283         for (i = start; i <= end; i += inc) {
284                 err = mlx4_table_get(dev, table, i);
285                 if (err)
286                         goto fail;
287         }
288
289         return 0;
290
291 fail:
292         while (i > start) {
293                 i -= inc;
294                 mlx4_table_put(dev, table, i);
295         }
296
297         return err;
298 }
299
300 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
301                           int start, int end)
302 {
303         int i;
304
305         for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
306                 mlx4_table_put(dev, table, i);
307 }
308
309 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
310                         u64 virt, int obj_size, int nobj, int reserved,
311                         int use_lowmem)
312 {
313         int obj_per_chunk;
314         int num_icm;
315         unsigned chunk_size;
316         int i;
317
318         obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
319         num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
320
321         table->icm      = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
322         if (!table->icm)
323                 return -ENOMEM;
324         table->virt     = virt;
325         table->num_icm  = num_icm;
326         table->num_obj  = nobj;
327         table->obj_size = obj_size;
328         table->lowmem   = use_lowmem;
329         mutex_init(&table->mutex);
330
331         for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
332                 chunk_size = MLX4_TABLE_CHUNK_SIZE;
333                 if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > nobj * obj_size)
334                         chunk_size = PAGE_ALIGN(nobj * obj_size - i * MLX4_TABLE_CHUNK_SIZE);
335
336                 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
337                                                (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
338                                                __GFP_NOWARN);
339                 if (!table->icm[i])
340                         goto err;
341                 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
342                         mlx4_free_icm(dev, table->icm[i]);
343                         table->icm[i] = NULL;
344                         goto err;
345                 }
346
347                 /*
348                  * Add a reference to this ICM chunk so that it never
349                  * gets freed (since it contains reserved firmware objects).
350                  */
351                 ++table->icm[i]->refcount;
352         }
353
354         return 0;
355
356 err:
357         for (i = 0; i < num_icm; ++i)
358                 if (table->icm[i]) {
359                         mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
360                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
361                         mlx4_free_icm(dev, table->icm[i]);
362                 }
363
364         return -ENOMEM;
365 }
366
367 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
368 {
369         int i;
370
371         for (i = 0; i < table->num_icm; ++i)
372                 if (table->icm[i]) {
373                         mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
374                                        MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
375                         mlx4_free_icm(dev, table->icm[i]);
376                 }
377
378         kfree(table->icm);
379 }