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/errno.h>
35 #include <linux/export.h>
36 #include <linux/io-mapping.h>
37 
38 #include <asm/page.h>
39 
40 #include "mlx4.h"
41 #include "icm.h"
42 
43 enum {
44 	MLX4_NUM_RESERVED_UARS = 8
45 };
46 
47 int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
48 {
49 	struct mlx4_priv *priv = mlx4_priv(dev);
50 
51 	*pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
52 	if (*pdn == -1)
53 		return -ENOMEM;
54 
55 	return 0;
56 }
57 EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
58 
59 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
60 {
61 	mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn, MLX4_USE_RR);
62 }
63 EXPORT_SYMBOL_GPL(mlx4_pd_free);
64 
65 int __mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
66 {
67 	struct mlx4_priv *priv = mlx4_priv(dev);
68 
69 	*xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap);
70 	if (*xrcdn == -1)
71 		return -ENOMEM;
72 
73 	return 0;
74 }
75 
76 int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
77 {
78 	u64 out_param;
79 	int err;
80 
81 	if (mlx4_is_mfunc(dev)) {
82 		err = mlx4_cmd_imm(dev, 0, &out_param,
83 				   RES_XRCD, RES_OP_RESERVE,
84 				   MLX4_CMD_ALLOC_RES,
85 				   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
86 		if (err)
87 			return err;
88 
89 		*xrcdn = get_param_l(&out_param);
90 		return 0;
91 	}
92 	return __mlx4_xrcd_alloc(dev, xrcdn);
93 }
94 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
95 
96 void __mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
97 {
98 	mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn, MLX4_USE_RR);
99 }
100 
101 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
102 {
103 	u64 in_param = 0;
104 	int err;
105 
106 	if (mlx4_is_mfunc(dev)) {
107 		set_param_l(&in_param, xrcdn);
108 		err = mlx4_cmd(dev, in_param, RES_XRCD,
109 			       RES_OP_RESERVE, MLX4_CMD_FREE_RES,
110 			       MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
111 		if (err)
112 			mlx4_warn(dev, "Failed to release xrcdn %d\n", xrcdn);
113 	} else
114 		__mlx4_xrcd_free(dev, xrcdn);
115 }
116 EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
117 
118 int mlx4_init_pd_table(struct mlx4_dev *dev)
119 {
120 	struct mlx4_priv *priv = mlx4_priv(dev);
121 
122 	return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
123 				(1 << NOT_MASKED_PD_BITS) - 1,
124 				 dev->caps.reserved_pds, 0);
125 }
126 
127 void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
128 {
129 	mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
130 }
131 
132 int mlx4_init_xrcd_table(struct mlx4_dev *dev)
133 {
134 	struct mlx4_priv *priv = mlx4_priv(dev);
135 
136 	return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
137 				(1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0);
138 }
139 
140 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
141 {
142 	mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
143 }
144 
145 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
146 {
147 	int offset;
148 
149 	uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
150 	if (uar->index == -1)
151 		return -ENOMEM;
152 
153 	if (mlx4_is_slave(dev))
154 		offset = uar->index % ((int)pci_resource_len(dev->persist->pdev,
155 							     2) /
156 				       dev->caps.uar_page_size);
157 	else
158 		offset = uar->index;
159 	uar->pfn = (pci_resource_start(dev->persist->pdev, 2) >> PAGE_SHIFT)
160 		    + offset;
161 	uar->map = NULL;
162 	return 0;
163 }
164 EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
165 
166 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
167 {
168 	mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index, MLX4_USE_RR);
169 }
170 EXPORT_SYMBOL_GPL(mlx4_uar_free);
171 
172 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf, int node)
173 {
174 	struct mlx4_priv *priv = mlx4_priv(dev);
175 	struct mlx4_uar *uar;
176 	int err = 0;
177 	int idx;
178 
179 	if (!priv->bf_mapping)
180 		return -ENOMEM;
181 
182 	mutex_lock(&priv->bf_mutex);
183 	if (!list_empty(&priv->bf_list))
184 		uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
185 	else {
186 		if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
187 			err = -ENOMEM;
188 			goto out;
189 		}
190 		uar = kmalloc_node(sizeof(*uar), GFP_KERNEL, node);
191 		if (!uar) {
192 			uar = kmalloc(sizeof(*uar), GFP_KERNEL);
193 			if (!uar) {
194 				err = -ENOMEM;
195 				goto out;
196 			}
197 		}
198 		err = mlx4_uar_alloc(dev, uar);
199 		if (err)
200 			goto free_kmalloc;
201 
202 		uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
203 		if (!uar->map) {
204 			err = -ENOMEM;
205 			goto free_uar;
206 		}
207 
208 		uar->bf_map = io_mapping_map_wc(priv->bf_mapping,
209 						uar->index << PAGE_SHIFT,
210 						PAGE_SIZE);
211 		if (!uar->bf_map) {
212 			err = -ENOMEM;
213 			goto unamp_uar;
214 		}
215 		uar->free_bf_bmap = 0;
216 		list_add(&uar->bf_list, &priv->bf_list);
217 	}
218 
219 	idx = ffz(uar->free_bf_bmap);
220 	uar->free_bf_bmap |= 1 << idx;
221 	bf->uar = uar;
222 	bf->offset = 0;
223 	bf->buf_size = dev->caps.bf_reg_size / 2;
224 	bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
225 	if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
226 		list_del_init(&uar->bf_list);
227 
228 	goto out;
229 
230 unamp_uar:
231 	bf->uar = NULL;
232 	iounmap(uar->map);
233 
234 free_uar:
235 	mlx4_uar_free(dev, uar);
236 
237 free_kmalloc:
238 	kfree(uar);
239 
240 out:
241 	mutex_unlock(&priv->bf_mutex);
242 	return err;
243 }
244 EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
245 
246 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
247 {
248 	struct mlx4_priv *priv = mlx4_priv(dev);
249 	int idx;
250 
251 	if (!bf->uar || !bf->uar->bf_map)
252 		return;
253 
254 	mutex_lock(&priv->bf_mutex);
255 	idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
256 	bf->uar->free_bf_bmap &= ~(1 << idx);
257 	if (!bf->uar->free_bf_bmap) {
258 		if (!list_empty(&bf->uar->bf_list))
259 			list_del(&bf->uar->bf_list);
260 
261 		io_mapping_unmap(bf->uar->bf_map);
262 		iounmap(bf->uar->map);
263 		mlx4_uar_free(dev, bf->uar);
264 		kfree(bf->uar);
265 	} else if (list_empty(&bf->uar->bf_list))
266 		list_add(&bf->uar->bf_list, &priv->bf_list);
267 
268 	mutex_unlock(&priv->bf_mutex);
269 }
270 EXPORT_SYMBOL_GPL(mlx4_bf_free);
271 
272 int mlx4_init_uar_table(struct mlx4_dev *dev)
273 {
274 	int num_reserved_uar = mlx4_get_num_reserved_uar(dev);
275 
276 	mlx4_dbg(dev, "uar_page_shift = %d", dev->uar_page_shift);
277 	mlx4_dbg(dev, "Effective reserved_uars=%d", dev->caps.reserved_uars);
278 
279 	if (dev->caps.num_uars <= num_reserved_uar) {
280 		mlx4_err(
281 			dev, "Only %d UAR pages (need more than %d)\n",
282 			dev->caps.num_uars, num_reserved_uar);
283 		mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
284 		return -ENODEV;
285 	}
286 
287 	return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
288 				dev->caps.num_uars, dev->caps.num_uars - 1,
289 				dev->caps.reserved_uars, 0);
290 }
291 
292 void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
293 {
294 	mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
295 }
296