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 44 enum { 45 MLX4_NUM_RESERVED_UARS = 8 46 }; 47 48 int 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 } 58 EXPORT_SYMBOL_GPL(mlx4_pd_alloc); 59 60 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn) 61 { 62 mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn); 63 } 64 EXPORT_SYMBOL_GPL(mlx4_pd_free); 65 66 int 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 } 76 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc); 77 78 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn) 79 { 80 mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn); 81 } 82 EXPORT_SYMBOL_GPL(mlx4_xrcd_free); 83 84 int 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 93 void mlx4_cleanup_pd_table(struct mlx4_dev *dev) 94 { 95 mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap); 96 } 97 98 int 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 } 105 106 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev) 107 { 108 mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap); 109 } 110 111 int 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 } 128 EXPORT_SYMBOL_GPL(mlx4_uar_alloc); 129 130 void 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 } 134 EXPORT_SYMBOL_GPL(mlx4_uar_free); 135 136 int 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; 189 190 unamp_uar: 191 bf->uar = NULL; 192 iounmap(uar->map); 193 194 free_uar: 195 mlx4_uar_free(dev, uar); 196 197 free_kmalloc: 198 kfree(uar); 199 200 out: 201 mutex_unlock(&priv->bf_mutex); 202 return err; 203 } 204 EXPORT_SYMBOL_GPL(mlx4_bf_alloc); 205 206 void 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 } 230 EXPORT_SYMBOL_GPL(mlx4_bf_free); 231 232 int 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 } 245 246 void mlx4_cleanup_uar_table(struct mlx4_dev *dev) 247 { 248 mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap); 249 } 250