pd.c revision 273246 
1/*
2 * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
3 * Copyright (c) 2005, 2014 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/module.h>
36#include <linux/io-mapping.h>
37
38#include <linux/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->pdev, 2) /
155				       dev->caps.uar_page_size);
156	else
157		offset = uar->index;
158	uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + offset;
159	uar->map = NULL;
160	return 0;
161}
162EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
163
164void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
165{
166	mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index, MLX4_USE_RR);
167}
168EXPORT_SYMBOL_GPL(mlx4_uar_free);
169
170#ifndef CONFIG_PPC
171int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf, int node)
172{
173	struct mlx4_priv *priv = mlx4_priv(dev);
174	struct mlx4_uar *uar;
175	int err = 0;
176	int idx;
177
178	if (!priv->bf_mapping)
179		return -ENOMEM;
180
181	mutex_lock(&priv->bf_mutex);
182	if (!list_empty(&priv->bf_list))
183		uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
184	else {
185		if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
186			err = -ENOMEM;
187			goto out;
188		}
189		uar = kmalloc_node(sizeof *uar, GFP_KERNEL, node);
190		if (!uar) {
191			uar = kmalloc(sizeof *uar, GFP_KERNEL);
192			if (!uar) {
193				err = -ENOMEM;
194				goto out;
195			}
196		}
197		err = mlx4_uar_alloc(dev, uar);
198		if (err)
199			goto free_kmalloc;
200
201		uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
202		if (!uar->map) {
203			err = -ENOMEM;
204			goto free_uar;
205		}
206
207		uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
208		if (!uar->bf_map) {
209			err = -ENOMEM;
210			goto unamp_uar;
211		}
212		uar->free_bf_bmap = 0;
213		list_add(&uar->bf_list, &priv->bf_list);
214	}
215
216	bf->uar = uar;
217	idx = ffz(uar->free_bf_bmap);
218	uar->free_bf_bmap |= 1 << idx;
219	bf->uar = uar;
220	bf->offset = 0;
221	bf->buf_size = dev->caps.bf_reg_size / 2;
222	bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
223	if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
224		list_del_init(&uar->bf_list);
225
226	goto out;
227
228unamp_uar:
229	bf->uar = NULL;
230	iounmap(uar->map);
231
232free_uar:
233	mlx4_uar_free(dev, uar);
234
235free_kmalloc:
236	kfree(uar);
237
238out:
239	mutex_unlock(&priv->bf_mutex);
240	return err;
241}
242EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
243
244void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
245{
246	struct mlx4_priv *priv = mlx4_priv(dev);
247	int idx;
248
249	if (!bf->uar || !bf->uar->bf_map)
250		return;
251
252	mutex_lock(&priv->bf_mutex);
253	idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
254	bf->uar->free_bf_bmap &= ~(1 << idx);
255	if (!bf->uar->free_bf_bmap) {
256		if (!list_empty(&bf->uar->bf_list))
257			list_del(&bf->uar->bf_list);
258
259		io_mapping_unmap(bf->uar->bf_map);
260		iounmap(bf->uar->map);
261		mlx4_uar_free(dev, bf->uar);
262		kfree(bf->uar);
263	} else if (list_empty(&bf->uar->bf_list))
264		list_add(&bf->uar->bf_list, &priv->bf_list);
265
266	mutex_unlock(&priv->bf_mutex);
267}
268EXPORT_SYMBOL_GPL(mlx4_bf_free);
269
270#else
271int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf, int node)
272{
273	memset(bf, 0, sizeof *bf);
274	return -ENOSYS;
275}
276EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
277
278void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
279{
280       return;
281}
282EXPORT_SYMBOL_GPL(mlx4_bf_free);
283#endif
284
285int mlx4_init_uar_table(struct mlx4_dev *dev)
286{
287	if (dev->caps.num_uars <= 128) {
288		mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
289			 dev->caps.num_uars);
290		mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
291		return -ENODEV;
292	}
293
294	return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
295				dev->caps.num_uars, dev->caps.num_uars - 1,
296				dev->caps.reserved_uars, 0);
297}
298
299void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
300{
301	mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
302}
303