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
43enum {
44	MLX4_NUM_RESERVED_UARS = 8
45};
46
47int 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}
57EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
58
59void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
60{
61	mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn, MLX4_USE_RR);
62}
63EXPORT_SYMBOL_GPL(mlx4_pd_free);
64
65int __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
76int 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}
94EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
95
96void __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
101void 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}
116EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
117
118int 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
127void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
128{
129	mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
130}
131
132int 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
140void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
141{
142	mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
143}
144
145int 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}
164EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
165
166void 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}
170EXPORT_SYMBOL_GPL(mlx4_uar_free);
171
172int 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
230unamp_uar:
231	bf->uar = NULL;
232	iounmap(uar->map);
233
234free_uar:
235	mlx4_uar_free(dev, uar);
236
237free_kmalloc:
238	kfree(uar);
239
240out:
241	mutex_unlock(&priv->bf_mutex);
242	return err;
243}
244EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
245
246void 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}
270EXPORT_SYMBOL_GPL(mlx4_bf_free);
271
272int 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
292void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
293{
294	mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
295}
296