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/kernel.h>
34 #include <linux/module.h>
35 #include <linux/mlx5/driver.h>
36 #include <linux/mlx5/cmd.h>
37 #include "mlx5_core.h"
38
39 enum {
40 NUM_DRIVER_UARS = 4,
41 NUM_LOW_LAT_UUARS = 4,
42 };
43
44
45 struct mlx5_alloc_uar_mbox_in {
46 struct mlx5_inbox_hdr hdr;
47 u8 rsvd[8];
48 };
49
50 struct mlx5_alloc_uar_mbox_out {
51 struct mlx5_outbox_hdr hdr;
52 __be32 uarn;
53 u8 rsvd[4];
54 };
55
56 struct mlx5_free_uar_mbox_in {
57 struct mlx5_inbox_hdr hdr;
58 __be32 uarn;
59 u8 rsvd[4];
60 };
61
62 struct mlx5_free_uar_mbox_out {
63 struct mlx5_outbox_hdr hdr;
64 u8 rsvd[8];
65 };
66
mlx5_cmd_alloc_uar(struct mlx5_core_dev * dev,u32 * uarn)67 int mlx5_cmd_alloc_uar(struct mlx5_core_dev *dev, u32 *uarn)
68 {
69 struct mlx5_alloc_uar_mbox_in in;
70 struct mlx5_alloc_uar_mbox_out out;
71 int err;
72
73 memset(&in, 0, sizeof(in));
74 memset(&out, 0, sizeof(out));
75 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_ALLOC_UAR);
76 err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
77 if (err)
78 goto ex;
79
80 if (out.hdr.status) {
81 err = mlx5_cmd_status_to_err(&out.hdr);
82 goto ex;
83 }
84
85 *uarn = be32_to_cpu(out.uarn) & 0xffffff;
86
87 ex:
88 return err;
89 }
90 EXPORT_SYMBOL(mlx5_cmd_alloc_uar);
91
mlx5_cmd_free_uar(struct mlx5_core_dev * dev,u32 uarn)92 int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn)
93 {
94 struct mlx5_free_uar_mbox_in in;
95 struct mlx5_free_uar_mbox_out out;
96 int err;
97
98 memset(&in, 0, sizeof(in));
99 memset(&out, 0, sizeof(out));
100 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_DEALLOC_UAR);
101 in.uarn = cpu_to_be32(uarn);
102 err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
103 if (err)
104 goto ex;
105
106 if (out.hdr.status)
107 err = mlx5_cmd_status_to_err(&out.hdr);
108
109 ex:
110 return err;
111 }
112 EXPORT_SYMBOL(mlx5_cmd_free_uar);
113
need_uuar_lock(int uuarn)114 static int need_uuar_lock(int uuarn)
115 {
116 int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE;
117
118 if (uuarn == 0 || tot_uuars - NUM_LOW_LAT_UUARS)
119 return 0;
120
121 return 1;
122 }
123
mlx5_alloc_uuars(struct mlx5_core_dev * dev,struct mlx5_uuar_info * uuari)124 int mlx5_alloc_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari)
125 {
126 int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE;
127 struct mlx5_bf *bf;
128 phys_addr_t addr;
129 int err;
130 int i;
131
132 uuari->num_uars = NUM_DRIVER_UARS;
133 uuari->num_low_latency_uuars = NUM_LOW_LAT_UUARS;
134
135 mutex_init(&uuari->lock);
136 uuari->uars = kcalloc(uuari->num_uars, sizeof(*uuari->uars), GFP_KERNEL);
137 if (!uuari->uars)
138 return -ENOMEM;
139
140 uuari->bfs = kcalloc(tot_uuars, sizeof(*uuari->bfs), GFP_KERNEL);
141 if (!uuari->bfs) {
142 err = -ENOMEM;
143 goto out_uars;
144 }
145
146 uuari->bitmap = kcalloc(BITS_TO_LONGS(tot_uuars), sizeof(*uuari->bitmap),
147 GFP_KERNEL);
148 if (!uuari->bitmap) {
149 err = -ENOMEM;
150 goto out_bfs;
151 }
152
153 uuari->count = kcalloc(tot_uuars, sizeof(*uuari->count), GFP_KERNEL);
154 if (!uuari->count) {
155 err = -ENOMEM;
156 goto out_bitmap;
157 }
158
159 for (i = 0; i < uuari->num_uars; i++) {
160 err = mlx5_cmd_alloc_uar(dev, &uuari->uars[i].index);
161 if (err)
162 goto out_count;
163
164 addr = dev->iseg_base + ((phys_addr_t)(uuari->uars[i].index) << PAGE_SHIFT);
165 uuari->uars[i].map = ioremap(addr, PAGE_SIZE);
166 if (!uuari->uars[i].map) {
167 mlx5_cmd_free_uar(dev, uuari->uars[i].index);
168 err = -ENOMEM;
169 goto out_count;
170 }
171 mlx5_core_dbg(dev, "allocated uar index 0x%x, mmaped at %p\n",
172 uuari->uars[i].index, uuari->uars[i].map);
173 }
174
175 for (i = 0; i < tot_uuars; i++) {
176 bf = &uuari->bfs[i];
177
178 bf->buf_size = dev->caps.gen.bf_reg_size / 2;
179 bf->uar = &uuari->uars[i / MLX5_BF_REGS_PER_PAGE];
180 bf->regreg = uuari->uars[i / MLX5_BF_REGS_PER_PAGE].map;
181 bf->reg = NULL; /* Add WC support */
182 bf->offset = (i % MLX5_BF_REGS_PER_PAGE) * dev->caps.gen.bf_reg_size +
183 MLX5_BF_OFFSET;
184 bf->need_lock = need_uuar_lock(i);
185 spin_lock_init(&bf->lock);
186 spin_lock_init(&bf->lock32);
187 bf->uuarn = i;
188 }
189
190 return 0;
191
192 out_count:
193 for (i--; i >= 0; i--) {
194 iounmap(uuari->uars[i].map);
195 mlx5_cmd_free_uar(dev, uuari->uars[i].index);
196 }
197 kfree(uuari->count);
198
199 out_bitmap:
200 kfree(uuari->bitmap);
201
202 out_bfs:
203 kfree(uuari->bfs);
204
205 out_uars:
206 kfree(uuari->uars);
207 return err;
208 }
209
mlx5_free_uuars(struct mlx5_core_dev * dev,struct mlx5_uuar_info * uuari)210 int mlx5_free_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari)
211 {
212 int i = uuari->num_uars;
213
214 for (i--; i >= 0; i--) {
215 iounmap(uuari->uars[i].map);
216 mlx5_cmd_free_uar(dev, uuari->uars[i].index);
217 }
218
219 kfree(uuari->count);
220 kfree(uuari->bitmap);
221 kfree(uuari->bfs);
222 kfree(uuari->uars);
223
224 return 0;
225 }
226