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 43 enum { 44 MLX4_NUM_RESERVED_UARS = 8 45 }; 46 47 int 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 } 57 EXPORT_SYMBOL_GPL(mlx4_pd_alloc); 58 59 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn) 60 { 61 mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn); 62 } 63 EXPORT_SYMBOL_GPL(mlx4_pd_free); 64 65 int 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 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc); 76 77 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn) 78 { 79 mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn); 80 } 81 EXPORT_SYMBOL_GPL(mlx4_xrcd_free); 82 83 int mlx4_init_pd_table(struct mlx4_dev *dev) 84 { 85 struct mlx4_priv *priv = mlx4_priv(dev); 86 87 return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds, 88 (1 << 24) - 1, dev->caps.reserved_pds, 0); 89 } 90 91 void mlx4_cleanup_pd_table(struct mlx4_dev *dev) 92 { 93 mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap); 94 } 95 96 int mlx4_init_xrcd_table(struct mlx4_dev *dev) 97 { 98 struct mlx4_priv *priv = mlx4_priv(dev); 99 100 return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16), 101 (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0); 102 } 103 104 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev) 105 { 106 mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap); 107 } 108 109 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar) 110 { 111 uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap); 112 if (uar->index == -1) 113 return -ENOMEM; 114 115 uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index; 116 uar->map = NULL; 117 118 return 0; 119 } 120 EXPORT_SYMBOL_GPL(mlx4_uar_alloc); 121 122 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar) 123 { 124 mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index); 125 } 126 EXPORT_SYMBOL_GPL(mlx4_uar_free); 127 128 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf) 129 { 130 struct mlx4_priv *priv = mlx4_priv(dev); 131 struct mlx4_uar *uar; 132 int err = 0; 133 int idx; 134 135 if (!priv->bf_mapping) 136 return -ENOMEM; 137 138 mutex_lock(&priv->bf_mutex); 139 if (!list_empty(&priv->bf_list)) 140 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list); 141 else { 142 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) { 143 err = -ENOMEM; 144 goto out; 145 } 146 uar = kmalloc(sizeof *uar, GFP_KERNEL); 147 if (!uar) { 148 err = -ENOMEM; 149 goto out; 150 } 151 err = mlx4_uar_alloc(dev, uar); 152 if (err) 153 goto free_kmalloc; 154 155 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE); 156 if (!uar->map) { 157 err = -ENOMEM; 158 goto free_uar; 159 } 160 161 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT); 162 if (!uar->bf_map) { 163 err = -ENOMEM; 164 goto unamp_uar; 165 } 166 uar->free_bf_bmap = 0; 167 list_add(&uar->bf_list, &priv->bf_list); 168 } 169 170 bf->uar = uar; 171 idx = ffz(uar->free_bf_bmap); 172 uar->free_bf_bmap |= 1 << idx; 173 bf->uar = uar; 174 bf->offset = 0; 175 bf->buf_size = dev->caps.bf_reg_size / 2; 176 bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size; 177 if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1) 178 list_del_init(&uar->bf_list); 179 180 goto out; 181 182 unamp_uar: 183 bf->uar = NULL; 184 iounmap(uar->map); 185 186 free_uar: 187 mlx4_uar_free(dev, uar); 188 189 free_kmalloc: 190 kfree(uar); 191 192 out: 193 mutex_unlock(&priv->bf_mutex); 194 return err; 195 } 196 EXPORT_SYMBOL_GPL(mlx4_bf_alloc); 197 198 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf) 199 { 200 struct mlx4_priv *priv = mlx4_priv(dev); 201 int idx; 202 203 if (!bf->uar || !bf->uar->bf_map) 204 return; 205 206 mutex_lock(&priv->bf_mutex); 207 idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size; 208 bf->uar->free_bf_bmap &= ~(1 << idx); 209 if (!bf->uar->free_bf_bmap) { 210 if (!list_empty(&bf->uar->bf_list)) 211 list_del(&bf->uar->bf_list); 212 213 io_mapping_unmap(bf->uar->bf_map); 214 iounmap(bf->uar->map); 215 mlx4_uar_free(dev, bf->uar); 216 kfree(bf->uar); 217 } else if (list_empty(&bf->uar->bf_list)) 218 list_add(&bf->uar->bf_list, &priv->bf_list); 219 220 mutex_unlock(&priv->bf_mutex); 221 } 222 EXPORT_SYMBOL_GPL(mlx4_bf_free); 223 224 int mlx4_init_uar_table(struct mlx4_dev *dev) 225 { 226 if (dev->caps.num_uars <= 128) { 227 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n", 228 dev->caps.num_uars); 229 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n"); 230 return -ENODEV; 231 } 232 233 return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap, 234 dev->caps.num_uars, dev->caps.num_uars - 1, 235 max(128, dev->caps.reserved_uars), 0); 236 } 237 238 void mlx4_cleanup_uar_table(struct mlx4_dev *dev) 239 { 240 mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap); 241 } 242