1 /*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2005 Mellanox Technologies. 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 #include <linux/export.h>
37 #include <linux/io-mapping.h>
38
39 #include <asm/page.h>
40
41 #include "mlx4.h"
42 #include "icm.h"
43
44 enum {
45 MLX4_NUM_RESERVED_UARS = 8
46 };
47
mlx4_pd_alloc(struct mlx4_dev * dev,u32 * pdn)48 int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
49 {
50 struct mlx4_priv *priv = mlx4_priv(dev);
51
52 *pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
53 if (*pdn == -1)
54 return -ENOMEM;
55
56 return 0;
57 }
58 EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
59
mlx4_pd_free(struct mlx4_dev * dev,u32 pdn)60 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
61 {
62 mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
63 }
64 EXPORT_SYMBOL_GPL(mlx4_pd_free);
65
mlx4_xrcd_alloc(struct mlx4_dev * dev,u32 * xrcdn)66 int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
67 {
68 struct mlx4_priv *priv = mlx4_priv(dev);
69
70 *xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap);
71 if (*xrcdn == -1)
72 return -ENOMEM;
73
74 return 0;
75 }
76 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
77
mlx4_xrcd_free(struct mlx4_dev * dev,u32 xrcdn)78 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
79 {
80 mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn);
81 }
82 EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
83
mlx4_init_pd_table(struct mlx4_dev * dev)84 int mlx4_init_pd_table(struct mlx4_dev *dev)
85 {
86 struct mlx4_priv *priv = mlx4_priv(dev);
87
88 return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
89 (1 << NOT_MASKED_PD_BITS) - 1,
90 dev->caps.reserved_pds, 0);
91 }
92
mlx4_cleanup_pd_table(struct mlx4_dev * dev)93 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
94 {
95 mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
96 }
97
mlx4_init_xrcd_table(struct mlx4_dev * dev)98 int mlx4_init_xrcd_table(struct mlx4_dev *dev)
99 {
100 struct mlx4_priv *priv = mlx4_priv(dev);
101
102 return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
103 (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0);
104 }
105
mlx4_cleanup_xrcd_table(struct mlx4_dev * dev)106 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
107 {
108 mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
109 }
110
mlx4_uar_alloc(struct mlx4_dev * dev,struct mlx4_uar * uar)111 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
112 {
113 int offset;
114
115 uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
116 if (uar->index == -1)
117 return -ENOMEM;
118
119 if (mlx4_is_slave(dev))
120 offset = uar->index % ((int) pci_resource_len(dev->pdev, 2) /
121 dev->caps.uar_page_size);
122 else
123 offset = uar->index;
124 uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + offset;
125 uar->map = NULL;
126 return 0;
127 }
128 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
129
mlx4_uar_free(struct mlx4_dev * dev,struct mlx4_uar * uar)130 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
131 {
132 mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
133 }
134 EXPORT_SYMBOL_GPL(mlx4_uar_free);
135
mlx4_bf_alloc(struct mlx4_dev * dev,struct mlx4_bf * bf)136 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
137 {
138 struct mlx4_priv *priv = mlx4_priv(dev);
139 struct mlx4_uar *uar;
140 int err = 0;
141 int idx;
142
143 if (!priv->bf_mapping)
144 return -ENOMEM;
145
146 mutex_lock(&priv->bf_mutex);
147 if (!list_empty(&priv->bf_list))
148 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
149 else {
150 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
151 err = -ENOMEM;
152 goto out;
153 }
154 uar = kmalloc(sizeof *uar, GFP_KERNEL);
155 if (!uar) {
156 err = -ENOMEM;
157 goto out;
158 }
159 err = mlx4_uar_alloc(dev, uar);
160 if (err)
161 goto free_kmalloc;
162
163 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
164 if (!uar->map) {
165 err = -ENOMEM;
166 goto free_uar;
167 }
168
169 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
170 if (!uar->bf_map) {
171 err = -ENOMEM;
172 goto unamp_uar;
173 }
174 uar->free_bf_bmap = 0;
175 list_add(&uar->bf_list, &priv->bf_list);
176 }
177
178 bf->uar = uar;
179 idx = ffz(uar->free_bf_bmap);
180 uar->free_bf_bmap |= 1 << idx;
181 bf->uar = uar;
182 bf->offset = 0;
183 bf->buf_size = dev->caps.bf_reg_size / 2;
184 bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
185 if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
186 list_del_init(&uar->bf_list);
187
188 goto out;
189
190 unamp_uar:
191 bf->uar = NULL;
192 iounmap(uar->map);
193
194 free_uar:
195 mlx4_uar_free(dev, uar);
196
197 free_kmalloc:
198 kfree(uar);
199
200 out:
201 mutex_unlock(&priv->bf_mutex);
202 return err;
203 }
204 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
205
mlx4_bf_free(struct mlx4_dev * dev,struct mlx4_bf * bf)206 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
207 {
208 struct mlx4_priv *priv = mlx4_priv(dev);
209 int idx;
210
211 if (!bf->uar || !bf->uar->bf_map)
212 return;
213
214 mutex_lock(&priv->bf_mutex);
215 idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
216 bf->uar->free_bf_bmap &= ~(1 << idx);
217 if (!bf->uar->free_bf_bmap) {
218 if (!list_empty(&bf->uar->bf_list))
219 list_del(&bf->uar->bf_list);
220
221 io_mapping_unmap(bf->uar->bf_map);
222 iounmap(bf->uar->map);
223 mlx4_uar_free(dev, bf->uar);
224 kfree(bf->uar);
225 } else if (list_empty(&bf->uar->bf_list))
226 list_add(&bf->uar->bf_list, &priv->bf_list);
227
228 mutex_unlock(&priv->bf_mutex);
229 }
230 EXPORT_SYMBOL_GPL(mlx4_bf_free);
231
mlx4_init_uar_table(struct mlx4_dev * dev)232 int mlx4_init_uar_table(struct mlx4_dev *dev)
233 {
234 if (dev->caps.num_uars <= 128) {
235 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
236 dev->caps.num_uars);
237 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
238 return -ENODEV;
239 }
240
241 return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
242 dev->caps.num_uars, dev->caps.num_uars - 1,
243 dev->caps.reserved_uars, 0);
244 }
245
mlx4_cleanup_uar_table(struct mlx4_dev * dev)246 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
247 {
248 mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
249 }
250