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/io-mapping.h>
 36
 37#include <asm/page.h>
 38
 39#include "mlx4.h"
 40#include "icm.h"
 41
 42enum {
 43	MLX4_NUM_RESERVED_UARS = 8
 44};
 45
 46int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn)
 47{
 48	struct mlx4_priv *priv = mlx4_priv(dev);
 49
 50	*pdn = mlx4_bitmap_alloc(&priv->pd_bitmap);
 51	if (*pdn == -1)
 52		return -ENOMEM;
 53
 54	return 0;
 55}
 56EXPORT_SYMBOL_GPL(mlx4_pd_alloc);
 57
 58void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn)
 59{
 60	mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn);
 61}
 62EXPORT_SYMBOL_GPL(mlx4_pd_free);
 63
 64int mlx4_init_pd_table(struct mlx4_dev *dev)
 65{
 66	struct mlx4_priv *priv = mlx4_priv(dev);
 67
 68	return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds,
 69				(1 << 24) - 1, dev->caps.reserved_pds, 0);
 70}
 71
 72void mlx4_cleanup_pd_table(struct mlx4_dev *dev)
 73{
 74	mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap);
 75}
 76
 77
 78int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar)
 79{
 80	uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap);
 81	if (uar->index == -1)
 82		return -ENOMEM;
 83
 84	uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index;
 85	uar->map = NULL;
 86
 87	return 0;
 88}
 89EXPORT_SYMBOL_GPL(mlx4_uar_alloc);
 90
 91void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar)
 92{
 93	mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index);
 94}
 95EXPORT_SYMBOL_GPL(mlx4_uar_free);
 96
 97int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf)
 98{
 99	struct mlx4_priv *priv = mlx4_priv(dev);
100	struct mlx4_uar *uar;
101	int err = 0;
102	int idx;
103
104	if (!priv->bf_mapping)
105		return -ENOMEM;
106
107	mutex_lock(&priv->bf_mutex);
108	if (!list_empty(&priv->bf_list))
109		uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list);
110	else {
111		if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) {
112			err = -ENOMEM;
113			goto out;
114		}
115		uar = kmalloc(sizeof *uar, GFP_KERNEL);
116		if (!uar) {
117			err = -ENOMEM;
118			goto out;
119		}
120		err = mlx4_uar_alloc(dev, uar);
121		if (err)
122			goto free_kmalloc;
123
124		uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE);
125		if (!uar->map) {
126			err = -ENOMEM;
127			goto free_uar;
128		}
129
130		uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT);
131		if (!uar->bf_map) {
132			err = -ENOMEM;
133			goto unamp_uar;
134		}
135		uar->free_bf_bmap = 0;
136		list_add(&uar->bf_list, &priv->bf_list);
137	}
138
139	bf->uar = uar;
140	idx = ffz(uar->free_bf_bmap);
141	uar->free_bf_bmap |= 1 << idx;
142	bf->uar = uar;
143	bf->offset = 0;
144	bf->buf_size = dev->caps.bf_reg_size / 2;
145	bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size;
146	if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1)
147		list_del_init(&uar->bf_list);
148
149	goto out;
150
151unamp_uar:
152	bf->uar = NULL;
153	iounmap(uar->map);
154
155free_uar:
156	mlx4_uar_free(dev, uar);
157
158free_kmalloc:
159	kfree(uar);
160
161out:
162	mutex_unlock(&priv->bf_mutex);
163	return err;
164}
165EXPORT_SYMBOL_GPL(mlx4_bf_alloc);
166
167void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf)
168{
169	struct mlx4_priv *priv = mlx4_priv(dev);
170	int idx;
171
172	if (!bf->uar || !bf->uar->bf_map)
173		return;
174
175	mutex_lock(&priv->bf_mutex);
176	idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size;
177	bf->uar->free_bf_bmap &= ~(1 << idx);
178	if (!bf->uar->free_bf_bmap) {
179		if (!list_empty(&bf->uar->bf_list))
180			list_del(&bf->uar->bf_list);
181
182		io_mapping_unmap(bf->uar->bf_map);
183		iounmap(bf->uar->map);
184		mlx4_uar_free(dev, bf->uar);
185		kfree(bf->uar);
186	} else if (list_empty(&bf->uar->bf_list))
187		list_add(&bf->uar->bf_list, &priv->bf_list);
188
189	mutex_unlock(&priv->bf_mutex);
190}
191EXPORT_SYMBOL_GPL(mlx4_bf_free);
192
193int mlx4_init_uar_table(struct mlx4_dev *dev)
194{
195	if (dev->caps.num_uars <= 128) {
196		mlx4_err(dev, "Only %d UAR pages (need more than 128)\n",
197			 dev->caps.num_uars);
198		mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n");
199		return -ENODEV;
200	}
201
202	return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap,
203				dev->caps.num_uars, dev->caps.num_uars - 1,
204				max(128, dev->caps.reserved_uars), 0);
205}
206
207void mlx4_cleanup_uar_table(struct mlx4_dev *dev)
208{
209	mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap);
210}