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 */
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
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
79 int mthca_alloc_init(struct mthca_alloc *alloc, u32 num, u32 mask,
80 u32 reserved)
81 {
82 int i;
83
84 /* num must be a power of 2 */
85 if (num != 1 << (ffs(num) - 1))
86 return -EINVAL;
87
88 alloc->last = 0;
89 alloc->top = 0;
90 alloc->max = num;
91 alloc->mask = mask;
92 spin_lock_init(&alloc->lock);
93 alloc->table = kmalloc(BITS_TO_LONGS(num) * sizeof (long),
94 GFP_KERNEL);
95 if (!alloc->table)
96 return -ENOMEM;
97
98 bitmap_zero(alloc->table, num);
99 for (i = 0; i < reserved; ++i)
100 set_bit(i, alloc->table);
101
102 return 0;
103 }
104
105 void mthca_alloc_cleanup(struct mthca_alloc *alloc)
106 {
107 kfree(alloc->table);
108 }
109
110 /*
111 * Array of pointers with lazy allocation of leaf pages. Callers of
112 * _get, _set and _clear methods must use a lock or otherwise
113 * serialize access to the array.
114 */
115
116 #define MTHCA_ARRAY_MASK (PAGE_SIZE / sizeof (void *) - 1)
117
118 void *mthca_array_get(struct mthca_array *array, int index)
119 {
120 int p = (index * sizeof (void *)) >> PAGE_SHIFT;
121
122 if (array->page_list[p].page)
123 return array->page_list[p].page[index & MTHCA_ARRAY_MASK];
124 else
125 return NULL;
126 }
127
128 int mthca_array_set(struct mthca_array *array, int index, void *value)
129 {
130 int p = (index * sizeof (void *)) >> PAGE_SHIFT;
131
132 /* Allocate with GFP_ATOMIC because we'll be called with locks held. */
133 if (!array->page_list[p].page)
134 array->page_list[p].page = (void **) get_zeroed_page(GFP_ATOMIC);
135
136 if (!array->page_list[p].page)
137 return -ENOMEM;
138
139 array->page_list[p].page[index & MTHCA_ARRAY_MASK] = value;
140 ++array->page_list[p].used;
141
142 return 0;
143 }
144
145 void mthca_array_clear(struct mthca_array *array, int index)
146 {
147 int p = (index * sizeof (void *)) >> PAGE_SHIFT;
148
149 if (--array->page_list[p].used == 0) {
150 free_page((unsigned long) array->page_list[p].page);
151 array->page_list[p].page = NULL;
152 } else
153 array->page_list[p].page[index & MTHCA_ARRAY_MASK] = NULL;
154
155 if (array->page_list[p].used < 0)
156 pr_debug("Array %p index %d page %d with ref count %d < 0\n",
157 array, index, p, array->page_list[p].used);
158 }
159
160 int mthca_array_init(struct mthca_array *array, int nent)
161 {
162 int npage = (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE;
163 int i;
164
165 array->page_list = kmalloc(npage * sizeof *array->page_list, GFP_KERNEL);
166 if (!array->page_list)
167 return -ENOMEM;
168
169 for (i = 0; i < npage; ++i) {
170 array->page_list[i].page = NULL;
171 array->page_list[i].used = 0;
172 }
173
174 return 0;
175 }
176
177 void mthca_array_cleanup(struct mthca_array *array, int nent)
178 {
179 int i;
180
181 for (i = 0; i < (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
182 free_page((unsigned long) array->page_list[i].page);
183
184 kfree(array->page_list);
185 }
186
187 /*
188 * Handling for queue buffers -- we allocate a bunch of memory and
189 * register it in a memory region at HCA virtual address 0. If the
190 * requested size is > max_direct, we split the allocation into
191 * multiple pages, so we don't require too much contiguous memory.
192 */
193
194 int mthca_buf_alloc(struct mthca_dev *dev, int size, int max_direct,
195 union mthca_buf *buf, int *is_direct, struct mthca_pd *pd,
196 int hca_write, struct mthca_mr *mr)
197 {
198 int err = -ENOMEM;
199 int npages, shift;
200 u64 *dma_list = NULL;
201 dma_addr_t t;
202 int i;
203
204 if (size <= max_direct) {
205 *is_direct = 1;
206 npages = 1;
207 shift = get_order(size) + PAGE_SHIFT;
208
209 buf->direct.buf = dma_alloc_coherent(&dev->pdev->dev,
210 size, &t, GFP_KERNEL);
211 if (!buf->direct.buf)
212 return -ENOMEM;
213
214 pci_unmap_addr_set(&buf->direct, mapping, t);
215
216 memset(buf->direct.buf, 0, size);
217
218 while (t & ((1 << shift) - 1)) {
219 --shift;
220 npages *= 2;
221 }
222
223 dma_list = kmalloc(npages * sizeof *dma_list, GFP_KERNEL);
224 if (!dma_list)
225 goto err_free;
226
227 for (i = 0; i < npages; ++i)
228 dma_list[i] = t + i * (1 << shift);
229 } else {
230 *is_direct = 0;
231 npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
232 shift = PAGE_SHIFT;
233
234 dma_list = kmalloc(npages * sizeof *dma_list, GFP_KERNEL);
235 if (!dma_list)
236 return -ENOMEM;
237
238 buf->page_list = kmalloc(npages * sizeof *buf->page_list,
239 GFP_KERNEL);
240 if (!buf->page_list)
241 goto err_out;
242
243 for (i = 0; i < npages; ++i)
244 buf->page_list[i].buf = NULL;
245
246 for (i = 0; i < npages; ++i) {
247 buf->page_list[i].buf =
248 dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE,
249 &t, GFP_KERNEL);
250 if (!buf->page_list[i].buf)
251 goto err_free;
252
253 dma_list[i] = t;
254 pci_unmap_addr_set(&buf->page_list[i], mapping, t);
255
256 clear_page(buf->page_list[i].buf);
257 }
258 }
259
260 err = mthca_mr_alloc_phys(dev, pd->pd_num,
261 dma_list, shift, npages,
262 0, size,
263 MTHCA_MPT_FLAG_LOCAL_READ |
264 (hca_write ? MTHCA_MPT_FLAG_LOCAL_WRITE : 0),
265 mr);
266 if (err)
267 goto err_free;
268
269 kfree(dma_list);
270
271 return 0;
272
273 err_free:
274 mthca_buf_free(dev, size, buf, *is_direct, NULL);
275
276 err_out:
277 kfree(dma_list);
278
279 return err;
280 }
281
282 void mthca_buf_free(struct mthca_dev *dev, int size, union mthca_buf *buf,
283 int is_direct, struct mthca_mr *mr)
284 {
285 int i;
286
287 if (mr)
288 mthca_free_mr(dev, mr);
289
290 if (is_direct)
291 dma_free_coherent(&dev->pdev->dev, size, buf->direct.buf,
292 pci_unmap_addr(&buf->direct, mapping));
293 else {
294 for (i = 0; i < (size + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
295 dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
296 buf->page_list[i].buf,
297 pci_unmap_addr(&buf->page_list[i],
298 mapping));
299 kfree(buf->page_list);
300 }
301 }
302
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