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e126ba97 | 1 | /* |
302bdf68 | 2 | * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. |
e126ba97 EC |
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> | |
88a85f99 | 35 | #include <linux/io-mapping.h> |
e126ba97 EC |
36 | #include <linux/mlx5/driver.h> |
37 | #include <linux/mlx5/cmd.h> | |
38 | #include "mlx5_core.h" | |
39 | ||
40 | enum { | |
41 | NUM_DRIVER_UARS = 4, | |
42 | NUM_LOW_LAT_UUARS = 4, | |
43 | }; | |
44 | ||
e126ba97 EC |
45 | int mlx5_cmd_alloc_uar(struct mlx5_core_dev *dev, u32 *uarn) |
46 | { | |
732ef5ad SM |
47 | u32 out[MLX5_ST_SZ_DW(alloc_uar_out)] = {0}; |
48 | u32 in[MLX5_ST_SZ_DW(alloc_uar_in)] = {0}; | |
e126ba97 EC |
49 | int err; |
50 | ||
732ef5ad SM |
51 | MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR); |
52 | err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out)); | |
c4f287c4 SM |
53 | if (!err) |
54 | *uarn = MLX5_GET(alloc_uar_out, out, uar); | |
e126ba97 EC |
55 | return err; |
56 | } | |
57 | EXPORT_SYMBOL(mlx5_cmd_alloc_uar); | |
58 | ||
59 | int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn) | |
60 | { | |
732ef5ad SM |
61 | u32 out[MLX5_ST_SZ_DW(dealloc_uar_out)] = {0}; |
62 | u32 in[MLX5_ST_SZ_DW(dealloc_uar_in)] = {0}; | |
e126ba97 | 63 | |
732ef5ad SM |
64 | MLX5_SET(dealloc_uar_in, in, opcode, MLX5_CMD_OP_DEALLOC_UAR); |
65 | MLX5_SET(dealloc_uar_in, in, uar, uarn); | |
c4f287c4 | 66 | return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out)); |
e126ba97 EC |
67 | } |
68 | EXPORT_SYMBOL(mlx5_cmd_free_uar); | |
69 | ||
70 | static int need_uuar_lock(int uuarn) | |
71 | { | |
72 | int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE; | |
73 | ||
74 | if (uuarn == 0 || tot_uuars - NUM_LOW_LAT_UUARS) | |
75 | return 0; | |
76 | ||
77 | return 1; | |
78 | } | |
79 | ||
80 | int mlx5_alloc_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari) | |
81 | { | |
82 | int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE; | |
83 | struct mlx5_bf *bf; | |
84 | phys_addr_t addr; | |
85 | int err; | |
86 | int i; | |
87 | ||
88 | uuari->num_uars = NUM_DRIVER_UARS; | |
89 | uuari->num_low_latency_uuars = NUM_LOW_LAT_UUARS; | |
90 | ||
91 | mutex_init(&uuari->lock); | |
92 | uuari->uars = kcalloc(uuari->num_uars, sizeof(*uuari->uars), GFP_KERNEL); | |
93 | if (!uuari->uars) | |
94 | return -ENOMEM; | |
95 | ||
96 | uuari->bfs = kcalloc(tot_uuars, sizeof(*uuari->bfs), GFP_KERNEL); | |
97 | if (!uuari->bfs) { | |
98 | err = -ENOMEM; | |
99 | goto out_uars; | |
100 | } | |
101 | ||
102 | uuari->bitmap = kcalloc(BITS_TO_LONGS(tot_uuars), sizeof(*uuari->bitmap), | |
103 | GFP_KERNEL); | |
104 | if (!uuari->bitmap) { | |
105 | err = -ENOMEM; | |
106 | goto out_bfs; | |
107 | } | |
108 | ||
109 | uuari->count = kcalloc(tot_uuars, sizeof(*uuari->count), GFP_KERNEL); | |
110 | if (!uuari->count) { | |
111 | err = -ENOMEM; | |
112 | goto out_bitmap; | |
113 | } | |
114 | ||
115 | for (i = 0; i < uuari->num_uars; i++) { | |
116 | err = mlx5_cmd_alloc_uar(dev, &uuari->uars[i].index); | |
117 | if (err) | |
118 | goto out_count; | |
119 | ||
120 | addr = dev->iseg_base + ((phys_addr_t)(uuari->uars[i].index) << PAGE_SHIFT); | |
121 | uuari->uars[i].map = ioremap(addr, PAGE_SIZE); | |
122 | if (!uuari->uars[i].map) { | |
123 | mlx5_cmd_free_uar(dev, uuari->uars[i].index); | |
a661b43f | 124 | err = -ENOMEM; |
e126ba97 EC |
125 | goto out_count; |
126 | } | |
127 | mlx5_core_dbg(dev, "allocated uar index 0x%x, mmaped at %p\n", | |
128 | uuari->uars[i].index, uuari->uars[i].map); | |
129 | } | |
130 | ||
131 | for (i = 0; i < tot_uuars; i++) { | |
132 | bf = &uuari->bfs[i]; | |
133 | ||
938fe83c | 134 | bf->buf_size = (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) / 2; |
e126ba97 EC |
135 | bf->uar = &uuari->uars[i / MLX5_BF_REGS_PER_PAGE]; |
136 | bf->regreg = uuari->uars[i / MLX5_BF_REGS_PER_PAGE].map; | |
137 | bf->reg = NULL; /* Add WC support */ | |
938fe83c SM |
138 | bf->offset = (i % MLX5_BF_REGS_PER_PAGE) * |
139 | (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) + | |
140 | MLX5_BF_OFFSET; | |
e126ba97 EC |
141 | bf->need_lock = need_uuar_lock(i); |
142 | spin_lock_init(&bf->lock); | |
143 | spin_lock_init(&bf->lock32); | |
144 | bf->uuarn = i; | |
145 | } | |
146 | ||
147 | return 0; | |
148 | ||
149 | out_count: | |
150 | for (i--; i >= 0; i--) { | |
151 | iounmap(uuari->uars[i].map); | |
152 | mlx5_cmd_free_uar(dev, uuari->uars[i].index); | |
153 | } | |
154 | kfree(uuari->count); | |
155 | ||
156 | out_bitmap: | |
157 | kfree(uuari->bitmap); | |
158 | ||
159 | out_bfs: | |
160 | kfree(uuari->bfs); | |
161 | ||
162 | out_uars: | |
163 | kfree(uuari->uars); | |
164 | return err; | |
165 | } | |
166 | ||
167 | int mlx5_free_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari) | |
168 | { | |
169 | int i = uuari->num_uars; | |
170 | ||
171 | for (i--; i >= 0; i--) { | |
172 | iounmap(uuari->uars[i].map); | |
173 | mlx5_cmd_free_uar(dev, uuari->uars[i].index); | |
174 | } | |
175 | ||
176 | kfree(uuari->count); | |
177 | kfree(uuari->bitmap); | |
178 | kfree(uuari->bfs); | |
179 | kfree(uuari->uars); | |
180 | ||
181 | return 0; | |
182 | } | |
e281682b | 183 | |
0ba42241 ML |
184 | int mlx5_alloc_map_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar, |
185 | bool map_wc) | |
e281682b SM |
186 | { |
187 | phys_addr_t pfn; | |
188 | phys_addr_t uar_bar_start; | |
189 | int err; | |
190 | ||
191 | err = mlx5_cmd_alloc_uar(mdev, &uar->index); | |
192 | if (err) { | |
193 | mlx5_core_warn(mdev, "mlx5_cmd_alloc_uar() failed, %d\n", err); | |
194 | return err; | |
195 | } | |
196 | ||
197 | uar_bar_start = pci_resource_start(mdev->pdev, 0); | |
198 | pfn = (uar_bar_start >> PAGE_SHIFT) + uar->index; | |
e281682b | 199 | |
0ba42241 ML |
200 | if (map_wc) { |
201 | uar->bf_map = ioremap_wc(pfn << PAGE_SHIFT, PAGE_SIZE); | |
202 | if (!uar->bf_map) { | |
203 | mlx5_core_warn(mdev, "ioremap_wc() failed\n"); | |
204 | uar->map = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); | |
205 | if (!uar->map) | |
206 | goto err_free_uar; | |
207 | } | |
208 | } else { | |
209 | uar->map = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); | |
210 | if (!uar->map) | |
211 | goto err_free_uar; | |
212 | } | |
88a85f99 | 213 | |
e281682b SM |
214 | return 0; |
215 | ||
216 | err_free_uar: | |
0ba42241 ML |
217 | mlx5_core_warn(mdev, "ioremap() failed\n"); |
218 | err = -ENOMEM; | |
e281682b SM |
219 | mlx5_cmd_free_uar(mdev, uar->index); |
220 | ||
221 | return err; | |
222 | } | |
223 | EXPORT_SYMBOL(mlx5_alloc_map_uar); | |
224 | ||
225 | void mlx5_unmap_free_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar) | |
226 | { | |
5f8a02a4 GP |
227 | if (uar->map) |
228 | iounmap(uar->map); | |
229 | else | |
230 | iounmap(uar->bf_map); | |
e281682b SM |
231 | mlx5_cmd_free_uar(mdev, uar->index); |
232 | } | |
233 | EXPORT_SYMBOL(mlx5_unmap_free_uar); |