1 /*- 2 * Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #include <linux/kernel.h> 29 #include <linux/module.h> 30 #include <linux/io-mapping.h> 31 #include <dev/mlx5/driver.h> 32 #include "mlx5_core.h" 33 34 int mlx5_cmd_alloc_uar(struct mlx5_core_dev *dev, u32 *uarn) 35 { 36 u32 in[MLX5_ST_SZ_DW(alloc_uar_in)]; 37 u32 out[MLX5_ST_SZ_DW(alloc_uar_out)]; 38 int err; 39 40 memset(in, 0, sizeof(in)); 41 42 MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR); 43 44 memset(out, 0, sizeof(out)); 45 err = mlx5_cmd_exec_check_status(dev, in, sizeof(in), out, sizeof(out)); 46 if (err) 47 return err; 48 49 *uarn = MLX5_GET(alloc_uar_out, out, uar); 50 51 return 0; 52 } 53 EXPORT_SYMBOL(mlx5_cmd_alloc_uar); 54 55 int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn) 56 { 57 u32 in[MLX5_ST_SZ_DW(dealloc_uar_in)]; 58 u32 out[MLX5_ST_SZ_DW(dealloc_uar_out)]; 59 60 memset(in, 0, sizeof(in)); 61 62 MLX5_SET(dealloc_uar_in, in, opcode, MLX5_CMD_OP_DEALLOC_UAR); 63 MLX5_SET(dealloc_uar_in, in, uar, uarn); 64 65 memset(out, 0, sizeof(out)); 66 return mlx5_cmd_exec_check_status(dev, in, sizeof(in), 67 out, sizeof(out)); 68 } 69 EXPORT_SYMBOL(mlx5_cmd_free_uar); 70 71 static int need_uuar_lock(int uuarn) 72 { 73 int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE; 74 75 if (uuarn == 0 || tot_uuars - NUM_LOW_LAT_UUARS) 76 return 0; 77 78 return 1; 79 } 80 81 int mlx5_alloc_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari) 82 { 83 int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE; 84 struct mlx5_bf *bf; 85 phys_addr_t addr; 86 int err; 87 int i; 88 89 uuari->num_uars = NUM_DRIVER_UARS; 90 uuari->num_low_latency_uuars = NUM_LOW_LAT_UUARS; 91 92 mutex_init(&uuari->lock); 93 uuari->uars = kcalloc(uuari->num_uars, sizeof(*uuari->uars), GFP_KERNEL); 94 95 uuari->bfs = kcalloc(tot_uuars, sizeof(*uuari->bfs), GFP_KERNEL); 96 97 uuari->bitmap = kcalloc(BITS_TO_LONGS(tot_uuars), sizeof(*uuari->bitmap), 98 GFP_KERNEL); 99 100 uuari->count = kcalloc(tot_uuars, sizeof(*uuari->count), GFP_KERNEL); 101 102 for (i = 0; i < uuari->num_uars; i++) { 103 err = mlx5_cmd_alloc_uar(dev, &uuari->uars[i].index); 104 if (err) 105 goto out_count; 106 107 addr = pci_resource_start(dev->pdev, 0) + 108 ((phys_addr_t)(uuari->uars[i].index) << PAGE_SHIFT); 109 uuari->uars[i].map = ioremap(addr, PAGE_SIZE); 110 if (!uuari->uars[i].map) { 111 mlx5_cmd_free_uar(dev, uuari->uars[i].index); 112 err = -ENOMEM; 113 goto out_count; 114 } 115 mlx5_core_dbg(dev, "allocated uar index 0x%x, mmaped at %p\n", 116 uuari->uars[i].index, uuari->uars[i].map); 117 } 118 119 for (i = 0; i < tot_uuars; i++) { 120 bf = &uuari->bfs[i]; 121 122 bf->buf_size = (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) / 2; 123 bf->uar = &uuari->uars[i / MLX5_BF_REGS_PER_PAGE]; 124 bf->regreg = uuari->uars[i / MLX5_BF_REGS_PER_PAGE].map; 125 bf->reg = NULL; /* Add WC support */ 126 bf->offset = (i % MLX5_BF_REGS_PER_PAGE) * 127 (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) + 128 MLX5_BF_OFFSET; 129 bf->need_lock = need_uuar_lock(i); 130 spin_lock_init(&bf->lock); 131 spin_lock_init(&bf->lock32); 132 bf->uuarn = i; 133 } 134 135 return 0; 136 137 out_count: 138 for (i--; i >= 0; i--) { 139 iounmap(uuari->uars[i].map); 140 mlx5_cmd_free_uar(dev, uuari->uars[i].index); 141 } 142 kfree(uuari->count); 143 144 kfree(uuari->bitmap); 145 146 kfree(uuari->bfs); 147 148 kfree(uuari->uars); 149 return err; 150 } 151 152 int mlx5_free_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari) 153 { 154 int i = uuari->num_uars; 155 156 for (i--; i >= 0; i--) { 157 iounmap(uuari->uars[i].map); 158 mlx5_cmd_free_uar(dev, uuari->uars[i].index); 159 } 160 161 kfree(uuari->count); 162 kfree(uuari->bitmap); 163 kfree(uuari->bfs); 164 kfree(uuari->uars); 165 166 return 0; 167 } 168 169 int mlx5_alloc_map_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar) 170 { 171 phys_addr_t pfn; 172 phys_addr_t uar_bar_start; 173 int err; 174 175 err = mlx5_cmd_alloc_uar(mdev, &uar->index); 176 if (err) { 177 mlx5_core_warn(mdev, "mlx5_cmd_alloc_uar() failed, %d\n", err); 178 return err; 179 } 180 181 uar_bar_start = pci_resource_start(mdev->pdev, 0); 182 pfn = (uar_bar_start >> PAGE_SHIFT) + uar->index; 183 uar->map = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); 184 if (!uar->map) { 185 mlx5_core_warn(mdev, "ioremap() failed, %d\n", err); 186 err = -ENOMEM; 187 goto err_free_uar; 188 } 189 190 if (mdev->priv.bf_mapping) 191 uar->bf_map = io_mapping_map_wc(mdev->priv.bf_mapping, 192 uar->index << PAGE_SHIFT, 193 PAGE_SIZE); 194 195 return 0; 196 197 err_free_uar: 198 mlx5_cmd_free_uar(mdev, uar->index); 199 200 return err; 201 } 202 EXPORT_SYMBOL(mlx5_alloc_map_uar); 203 204 void mlx5_unmap_free_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar) 205 { 206 io_mapping_unmap(uar->bf_map); 207 iounmap(uar->map); 208 mlx5_cmd_free_uar(mdev, uar->index); 209 } 210 EXPORT_SYMBOL(mlx5_unmap_free_uar); 211