1/*
2 * Copyright (c) 2013-2015, Mellanox Technologies. 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/mm.h>
36#include <linux/export.h>
37#include <linux/bitmap.h>
38#include <linux/dma-mapping.h>
39#include <linux/vmalloc.h>
40#include <linux/mlx5/driver.h>
41
42#include "mlx5_core.h"
43
44struct mlx5_db_pgdir {
45 struct list_head list;
46 unsigned long *bitmap;
47 __be32 *db_page;
48 dma_addr_t db_dma;
49};
50
51/* Handling for queue buffers -- we allocate a bunch of memory and
52 * register it in a memory region at HCA virtual address 0.
53 */
54
55static void *mlx5_dma_zalloc_coherent_node(struct mlx5_core_dev *dev,
56 size_t size, dma_addr_t *dma_handle,
57 int node)
58{
59 struct device *device = mlx5_core_dma_dev(dev);
60 struct mlx5_priv *priv = &dev->priv;
61 int original_node;
62 void *cpu_handle;
63
64 mutex_lock(&priv->alloc_mutex);
65 original_node = dev_to_node(dev: device);
66 set_dev_node(dev: device, node);
67 cpu_handle = dma_alloc_coherent(dev: device, size, dma_handle,
68 GFP_KERNEL);
69 set_dev_node(dev: device, node: original_node);
70 mutex_unlock(lock: &priv->alloc_mutex);
71 return cpu_handle;
72}
73
74int mlx5_frag_buf_alloc_node(struct mlx5_core_dev *dev, int size,
75 struct mlx5_frag_buf *buf, int node)
76{
77 int i;
78
79 buf->size = size;
80 buf->npages = DIV_ROUND_UP(size, PAGE_SIZE);
81 buf->page_shift = PAGE_SHIFT;
82 buf->frags = kcalloc(n: buf->npages, size: sizeof(struct mlx5_buf_list),
83 GFP_KERNEL);
84 if (!buf->frags)
85 goto err_out;
86
87 for (i = 0; i < buf->npages; i++) {
88 struct mlx5_buf_list *frag = &buf->frags[i];
89 int frag_sz = min_t(int, size, PAGE_SIZE);
90
91 frag->buf = mlx5_dma_zalloc_coherent_node(dev, size: frag_sz,
92 dma_handle: &frag->map, node);
93 if (!frag->buf)
94 goto err_free_buf;
95 if (frag->map & ((1 << buf->page_shift) - 1)) {
96 dma_free_coherent(dev: mlx5_core_dma_dev(dev), size: frag_sz,
97 cpu_addr: buf->frags[i].buf, dma_handle: buf->frags[i].map);
98 mlx5_core_warn(dev, "unexpected map alignment: %pad, page_shift=%d\n",
99 &frag->map, buf->page_shift);
100 goto err_free_buf;
101 }
102 size -= frag_sz;
103 }
104
105 return 0;
106
107err_free_buf:
108 while (i--)
109 dma_free_coherent(dev: mlx5_core_dma_dev(dev), PAGE_SIZE, cpu_addr: buf->frags[i].buf,
110 dma_handle: buf->frags[i].map);
111 kfree(objp: buf->frags);
112err_out:
113 return -ENOMEM;
114}
115EXPORT_SYMBOL_GPL(mlx5_frag_buf_alloc_node);
116
117void mlx5_frag_buf_free(struct mlx5_core_dev *dev, struct mlx5_frag_buf *buf)
118{
119 int size = buf->size;
120 int i;
121
122 for (i = 0; i < buf->npages; i++) {
123 int frag_sz = min_t(int, size, PAGE_SIZE);
124
125 dma_free_coherent(dev: mlx5_core_dma_dev(dev), size: frag_sz, cpu_addr: buf->frags[i].buf,
126 dma_handle: buf->frags[i].map);
127 size -= frag_sz;
128 }
129 kfree(objp: buf->frags);
130}
131EXPORT_SYMBOL_GPL(mlx5_frag_buf_free);
132
133static struct mlx5_db_pgdir *mlx5_alloc_db_pgdir(struct mlx5_core_dev *dev,
134 int node)
135{
136 u32 db_per_page = PAGE_SIZE / cache_line_size();
137 struct mlx5_db_pgdir *pgdir;
138
139 pgdir = kzalloc_node(size: sizeof(*pgdir), GFP_KERNEL, node);
140 if (!pgdir)
141 return NULL;
142
143 pgdir->bitmap = bitmap_zalloc_node(nbits: db_per_page, GFP_KERNEL, node);
144 if (!pgdir->bitmap) {
145 kfree(objp: pgdir);
146 return NULL;
147 }
148
149 bitmap_fill(dst: pgdir->bitmap, nbits: db_per_page);
150
151 pgdir->db_page = mlx5_dma_zalloc_coherent_node(dev, PAGE_SIZE,
152 dma_handle: &pgdir->db_dma, node);
153 if (!pgdir->db_page) {
154 bitmap_free(bitmap: pgdir->bitmap);
155 kfree(objp: pgdir);
156 return NULL;
157 }
158
159 return pgdir;
160}
161
162static int mlx5_alloc_db_from_pgdir(struct mlx5_db_pgdir *pgdir,
163 struct mlx5_db *db)
164{
165 u32 db_per_page = PAGE_SIZE / cache_line_size();
166 int offset;
167 int i;
168
169 i = find_first_bit(addr: pgdir->bitmap, size: db_per_page);
170 if (i >= db_per_page)
171 return -ENOMEM;
172
173 __clear_bit(i, pgdir->bitmap);
174
175 db->u.pgdir = pgdir;
176 db->index = i;
177 offset = db->index * cache_line_size();
178 db->db = pgdir->db_page + offset / sizeof(*pgdir->db_page);
179 db->dma = pgdir->db_dma + offset;
180
181 db->db[0] = 0;
182 db->db[1] = 0;
183
184 return 0;
185}
186
187int mlx5_db_alloc_node(struct mlx5_core_dev *dev, struct mlx5_db *db, int node)
188{
189 struct mlx5_db_pgdir *pgdir;
190 int ret = 0;
191
192 mutex_lock(&dev->priv.pgdir_mutex);
193
194 list_for_each_entry(pgdir, &dev->priv.pgdir_list, list)
195 if (!mlx5_alloc_db_from_pgdir(pgdir, db))
196 goto out;
197
198 pgdir = mlx5_alloc_db_pgdir(dev, node);
199 if (!pgdir) {
200 ret = -ENOMEM;
201 goto out;
202 }
203
204 list_add(new: &pgdir->list, head: &dev->priv.pgdir_list);
205
206 /* This should never fail -- we just allocated an empty page: */
207 WARN_ON(mlx5_alloc_db_from_pgdir(pgdir, db));
208
209out:
210 mutex_unlock(lock: &dev->priv.pgdir_mutex);
211
212 return ret;
213}
214EXPORT_SYMBOL_GPL(mlx5_db_alloc_node);
215
216void mlx5_db_free(struct mlx5_core_dev *dev, struct mlx5_db *db)
217{
218 u32 db_per_page = PAGE_SIZE / cache_line_size();
219
220 mutex_lock(&dev->priv.pgdir_mutex);
221
222 __set_bit(db->index, db->u.pgdir->bitmap);
223
224 if (bitmap_full(src: db->u.pgdir->bitmap, nbits: db_per_page)) {
225 dma_free_coherent(dev: mlx5_core_dma_dev(dev), PAGE_SIZE,
226 cpu_addr: db->u.pgdir->db_page, dma_handle: db->u.pgdir->db_dma);
227 list_del(entry: &db->u.pgdir->list);
228 bitmap_free(bitmap: db->u.pgdir->bitmap);
229 kfree(objp: db->u.pgdir);
230 }
231
232 mutex_unlock(lock: &dev->priv.pgdir_mutex);
233}
234EXPORT_SYMBOL_GPL(mlx5_db_free);
235
236void mlx5_fill_page_frag_array_perm(struct mlx5_frag_buf *buf, __be64 *pas, u8 perm)
237{
238 int i;
239
240 WARN_ON(perm & 0xfc);
241 for (i = 0; i < buf->npages; i++)
242 pas[i] = cpu_to_be64(buf->frags[i].map | perm);
243}
244EXPORT_SYMBOL_GPL(mlx5_fill_page_frag_array_perm);
245
246void mlx5_fill_page_frag_array(struct mlx5_frag_buf *buf, __be64 *pas)
247{
248 mlx5_fill_page_frag_array_perm(buf, pas, 0);
249}
250EXPORT_SYMBOL_GPL(mlx5_fill_page_frag_array);
251

source code of linux/drivers/net/ethernet/mellanox/mlx5/core/alloc.c