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
44enum {
45	MLX4_NUM_RESERVED_UARS = 8
46};
47
48int 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}
58EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
59
60void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
61{
62	mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
63}
64EXPORT_SYMBOL_GPL(mlx4_pd_free);
65
66int 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}
76EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
77
78void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
79{
80	mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn);
81}
82EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
83
84int 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
93void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
94{
95	mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
96}
97
98int 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
106void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
107{
108	mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
109}
110
111int 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}
128EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
129
130void 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}
134EXPORT_SYMBOL_GPL(mlx4_uar_free);
135
136int 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
190unamp_uar:
191	bf->uar = NULL;
192	iounmap(uar->map);
193
194free_uar:
195	mlx4_uar_free(dev, uar);
196
197free_kmalloc:
198	kfree(uar);
199
200out:
201	mutex_unlock(&priv->bf_mutex);
202	return err;
203}
204EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
205
206void 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}
230EXPORT_SYMBOL_GPL(mlx4_bf_free);
231
232int 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
246void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
247{
248	mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
249}
250