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 if (mlx4_is_mfunc(dev)) 56 *pdn |= (dev->caps.function + 1) << NOT_MASKED_PD_BITS; 57 return 0; 58 } 59 EXPORT_SYMBOL_GPL(mlx4_pd_alloc); 60 61 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn) 62 { 63 mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn); 64 } 65 EXPORT_SYMBOL_GPL(mlx4_pd_free); 66 67 int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn) 68 { 69 struct mlx4_priv *priv = mlx4_priv(dev); 70 71 *xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap); 72 if (*xrcdn == -1) 73 return -ENOMEM; 74 75 return 0; 76 } 77 EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc); 78 79 void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn) 80 { 81 mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn); 82 } 83 EXPORT_SYMBOL_GPL(mlx4_xrcd_free); 84 85 int mlx4_init_pd_table(struct mlx4_dev *dev) 86 { 87 struct mlx4_priv *priv = mlx4_priv(dev); 88 89 return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds, 90 (1 << NOT_MASKED_PD_BITS) - 1, 91 dev->caps.reserved_pds, 0); 92 } 93 94 void mlx4_cleanup_pd_table(struct mlx4_dev *dev) 95 { 96 mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap); 97 } 98 99 int mlx4_init_xrcd_table(struct mlx4_dev *dev) 100 { 101 struct mlx4_priv *priv = mlx4_priv(dev); 102 103 return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16), 104 (1 << 16) - 1, dev->caps.reserved_xrcds + 1, 0); 105 } 106 107 void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev) 108 { 109 mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap); 110 } 111 112 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar) 113 { 114 int offset; 115 116 uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap); 117 if (uar->index == -1) 118 return -ENOMEM; 119 120 if (mlx4_is_slave(dev)) 121 offset = uar->index % ((int) pci_resource_len(dev->pdev, 2) / 122 dev->caps.uar_page_size); 123 else 124 offset = uar->index; 125 uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + offset; 126 uar->map = NULL; 127 return 0; 128 } 129 EXPORT_SYMBOL_GPL(mlx4_uar_alloc); 130 131 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar) 132 { 133 mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index); 134 } 135 EXPORT_SYMBOL_GPL(mlx4_uar_free); 136 137 int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf) 138 { 139 struct mlx4_priv *priv = mlx4_priv(dev); 140 struct mlx4_uar *uar; 141 int err = 0; 142 int idx; 143 144 if (!priv->bf_mapping) 145 return -ENOMEM; 146 147 mutex_lock(&priv->bf_mutex); 148 if (!list_empty(&priv->bf_list)) 149 uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list); 150 else { 151 if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) { 152 err = -ENOMEM; 153 goto out; 154 } 155 uar = kmalloc(sizeof *uar, GFP_KERNEL); 156 if (!uar) { 157 err = -ENOMEM; 158 goto out; 159 } 160 err = mlx4_uar_alloc(dev, uar); 161 if (err) 162 goto free_kmalloc; 163 164 uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE); 165 if (!uar->map) { 166 err = -ENOMEM; 167 goto free_uar; 168 } 169 170 uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT); 171 if (!uar->bf_map) { 172 err = -ENOMEM; 173 goto unamp_uar; 174 } 175 uar->free_bf_bmap = 0; 176 list_add(&uar->bf_list, &priv->bf_list); 177 } 178 179 bf->uar = uar; 180 idx = ffz(uar->free_bf_bmap); 181 uar->free_bf_bmap |= 1 << idx; 182 bf->uar = uar; 183 bf->offset = 0; 184 bf->buf_size = dev->caps.bf_reg_size / 2; 185 bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size; 186 if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1) 187 list_del_init(&uar->bf_list); 188 189 goto out; 190 191 unamp_uar: 192 bf->uar = NULL; 193 iounmap(uar->map); 194 195 free_uar: 196 mlx4_uar_free(dev, uar); 197 198 free_kmalloc: 199 kfree(uar); 200 201 out: 202 mutex_unlock(&priv->bf_mutex); 203 return err; 204 } 205 EXPORT_SYMBOL_GPL(mlx4_bf_alloc); 206 207 void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf) 208 { 209 struct mlx4_priv *priv = mlx4_priv(dev); 210 int idx; 211 212 if (!bf->uar || !bf->uar->bf_map) 213 return; 214 215 mutex_lock(&priv->bf_mutex); 216 idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size; 217 bf->uar->free_bf_bmap &= ~(1 << idx); 218 if (!bf->uar->free_bf_bmap) { 219 if (!list_empty(&bf->uar->bf_list)) 220 list_del(&bf->uar->bf_list); 221 222 io_mapping_unmap(bf->uar->bf_map); 223 iounmap(bf->uar->map); 224 mlx4_uar_free(dev, bf->uar); 225 kfree(bf->uar); 226 } else if (list_empty(&bf->uar->bf_list)) 227 list_add(&bf->uar->bf_list, &priv->bf_list); 228 229 mutex_unlock(&priv->bf_mutex); 230 } 231 EXPORT_SYMBOL_GPL(mlx4_bf_free); 232 233 int mlx4_init_uar_table(struct mlx4_dev *dev) 234 { 235 if (dev->caps.num_uars <= 128) { 236 mlx4_err(dev, "Only %d UAR pages (need more than 128)\n", 237 dev->caps.num_uars); 238 mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n"); 239 return -ENODEV; 240 } 241 242 return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap, 243 dev->caps.num_uars, dev->caps.num_uars - 1, 244 dev->caps.reserved_uars, 0); 245 } 246 247 void mlx4_cleanup_uar_table(struct mlx4_dev *dev) 248 { 249 mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap); 250 } 251