1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/errno.h>
34 #include <linux/slab.h>
35 #include <linux/bitmap.h>
36
37 #include "mthca_dev.h"
38
39 /* Trivial bitmap-based allocator */
mthca_alloc(struct mthca_alloc * alloc)40 u32 mthca_alloc(struct mthca_alloc *alloc)
41 {
42 unsigned long flags;
43 u32 obj;
44
45 spin_lock_irqsave(&alloc->lock, flags);
46
47 obj = find_next_zero_bit(alloc->table, alloc->max, alloc->last);
48 if (obj >= alloc->max) {
49 alloc->top = (alloc->top + alloc->max) & alloc->mask;
50 obj = find_first_zero_bit(alloc->table, alloc->max);
51 }
52
53 if (obj < alloc->max) {
54 __set_bit(obj, alloc->table);
55 obj |= alloc->top;
56 } else
57 obj = -1;
58
59 spin_unlock_irqrestore(&alloc->lock, flags);
60
61 return obj;
62 }
63
mthca_free(struct mthca_alloc * alloc,u32 obj)64 void mthca_free(struct mthca_alloc *alloc, u32 obj)
65 {
66 unsigned long flags;
67
68 obj &= alloc->max - 1;
69
70 spin_lock_irqsave(&alloc->lock, flags);
71
72 __clear_bit(obj, alloc->table);
73 alloc->last = min(alloc->last, obj);
74 alloc->top = (alloc->top + alloc->max) & alloc->mask;
75
76 spin_unlock_irqrestore(&alloc->lock, flags);
77 }
78
mthca_alloc_init(struct mthca_alloc * alloc,u32 num,u32 mask,u32 reserved)79 int mthca_alloc_init(struct mthca_alloc *alloc, u32 num, u32 mask,
80 u32 reserved)
81 {
82 /* num must be a power of 2 */
83 if (num != 1 << (ffs(num) - 1))
84 return -EINVAL;
85
86 alloc->last = 0;
87 alloc->top = 0;
88 alloc->max = num;
89 alloc->mask = mask;
90 spin_lock_init(&alloc->lock);
91 alloc->table = bitmap_zalloc(num, GFP_KERNEL);
92 if (!alloc->table)
93 return -ENOMEM;
94
95 bitmap_set(alloc->table, 0, reserved);
96
97 return 0;
98 }
99
mthca_alloc_cleanup(struct mthca_alloc * alloc)100 void mthca_alloc_cleanup(struct mthca_alloc *alloc)
101 {
102 bitmap_free(alloc->table);
103 }
104
105 /*
106 * Array of pointers with lazy allocation of leaf pages. Callers of
107 * _get, _set and _clear methods must use a lock or otherwise
108 * serialize access to the array.
109 */
110
111 #define MTHCA_ARRAY_MASK (PAGE_SIZE / sizeof (void *) - 1)
112
mthca_array_get(struct mthca_array * array,int index)113 void *mthca_array_get(struct mthca_array *array, int index)
114 {
115 int p = (index * sizeof (void *)) >> PAGE_SHIFT;
116
117 if (array->page_list[p].page)
118 return array->page_list[p].page[index & MTHCA_ARRAY_MASK];
119 else
120 return NULL;
121 }
122
mthca_array_set(struct mthca_array * array,int index,void * value)123 int mthca_array_set(struct mthca_array *array, int index, void *value)
124 {
125 int p = (index * sizeof (void *)) >> PAGE_SHIFT;
126
127 /* Allocate with GFP_ATOMIC because we'll be called with locks held. */
128 if (!array->page_list[p].page)
129 array->page_list[p].page = (void **) get_zeroed_page(GFP_ATOMIC);
130
131 if (!array->page_list[p].page)
132 return -ENOMEM;
133
134 array->page_list[p].page[index & MTHCA_ARRAY_MASK] = value;
135 ++array->page_list[p].used;
136
137 return 0;
138 }
139
mthca_array_clear(struct mthca_array * array,int index)140 void mthca_array_clear(struct mthca_array *array, int index)
141 {
142 int p = (index * sizeof (void *)) >> PAGE_SHIFT;
143
144 if (--array->page_list[p].used == 0) {
145 free_page((unsigned long) array->page_list[p].page);
146 array->page_list[p].page = NULL;
147 } else
148 array->page_list[p].page[index & MTHCA_ARRAY_MASK] = NULL;
149
150 if (array->page_list[p].used < 0)
151 pr_debug("Array %p index %d page %d with ref count %d < 0\n",
152 array, index, p, array->page_list[p].used);
153 }
154
mthca_array_init(struct mthca_array * array,int nent)155 int mthca_array_init(struct mthca_array *array, int nent)
156 {
157 int npage = (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE;
158 int i;
159
160 array->page_list = kmalloc_array(npage, sizeof(*array->page_list),
161 GFP_KERNEL);
162 if (!array->page_list)
163 return -ENOMEM;
164
165 for (i = 0; i < npage; ++i) {
166 array->page_list[i].page = NULL;
167 array->page_list[i].used = 0;
168 }
169
170 return 0;
171 }
172
mthca_array_cleanup(struct mthca_array * array,int nent)173 void mthca_array_cleanup(struct mthca_array *array, int nent)
174 {
175 int i;
176
177 for (i = 0; i < (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
178 free_page((unsigned long) array->page_list[i].page);
179
180 kfree(array->page_list);
181 }
182
183 /*
184 * Handling for queue buffers -- we allocate a bunch of memory and
185 * register it in a memory region at HCA virtual address 0. If the
186 * requested size is > max_direct, we split the allocation into
187 * multiple pages, so we don't require too much contiguous memory.
188 */
189
mthca_buf_alloc(struct mthca_dev * dev,int size,int max_direct,union mthca_buf * buf,int * is_direct,struct mthca_pd * pd,int hca_write,struct mthca_mr * mr)190 int mthca_buf_alloc(struct mthca_dev *dev, int size, int max_direct,
191 union mthca_buf *buf, int *is_direct, struct mthca_pd *pd,
192 int hca_write, struct mthca_mr *mr)
193 {
194 int err = -ENOMEM;
195 int npages, shift;
196 u64 *dma_list = NULL;
197 dma_addr_t t;
198 int i;
199
200 if (size <= max_direct) {
201 *is_direct = 1;
202 npages = 1;
203 shift = get_order(size) + PAGE_SHIFT;
204
205 buf->direct.buf = dma_alloc_coherent(&dev->pdev->dev,
206 size, &t, GFP_KERNEL);
207 if (!buf->direct.buf)
208 return -ENOMEM;
209
210 dma_unmap_addr_set(&buf->direct, mapping, t);
211
212 while (t & ((1 << shift) - 1)) {
213 --shift;
214 npages *= 2;
215 }
216
217 dma_list = kmalloc_array(npages, sizeof(*dma_list),
218 GFP_KERNEL);
219 if (!dma_list)
220 goto err_free;
221
222 for (i = 0; i < npages; ++i)
223 dma_list[i] = t + i * (1 << shift);
224 } else {
225 *is_direct = 0;
226 npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
227 shift = PAGE_SHIFT;
228
229 dma_list = kmalloc_array(npages, sizeof(*dma_list),
230 GFP_KERNEL);
231 if (!dma_list)
232 return -ENOMEM;
233
234 buf->page_list = kmalloc_array(npages,
235 sizeof(*buf->page_list),
236 GFP_KERNEL);
237 if (!buf->page_list)
238 goto err_out;
239
240 for (i = 0; i < npages; ++i)
241 buf->page_list[i].buf = NULL;
242
243 for (i = 0; i < npages; ++i) {
244 buf->page_list[i].buf =
245 dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE,
246 &t, GFP_KERNEL);
247 if (!buf->page_list[i].buf)
248 goto err_free;
249
250 dma_list[i] = t;
251 dma_unmap_addr_set(&buf->page_list[i], mapping, t);
252
253 clear_page(buf->page_list[i].buf);
254 }
255 }
256
257 err = mthca_mr_alloc_phys(dev, pd->pd_num,
258 dma_list, shift, npages,
259 0, size,
260 MTHCA_MPT_FLAG_LOCAL_READ |
261 (hca_write ? MTHCA_MPT_FLAG_LOCAL_WRITE : 0),
262 mr);
263 if (err)
264 goto err_free;
265
266 kfree(dma_list);
267
268 return 0;
269
270 err_free:
271 mthca_buf_free(dev, size, buf, *is_direct, NULL);
272
273 err_out:
274 kfree(dma_list);
275
276 return err;
277 }
278
mthca_buf_free(struct mthca_dev * dev,int size,union mthca_buf * buf,int is_direct,struct mthca_mr * mr)279 void mthca_buf_free(struct mthca_dev *dev, int size, union mthca_buf *buf,
280 int is_direct, struct mthca_mr *mr)
281 {
282 int i;
283
284 if (mr)
285 mthca_free_mr(dev, mr);
286
287 if (is_direct)
288 dma_free_coherent(&dev->pdev->dev, size, buf->direct.buf,
289 dma_unmap_addr(&buf->direct, mapping));
290 else {
291 for (i = 0; i < (size + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
292 dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
293 buf->page_list[i].buf,
294 dma_unmap_addr(&buf->page_list[i],
295 mapping));
296 kfree(buf->page_list);
297 }
298 }
299