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 enum { 35 NUM_DRIVER_UARS = 4, 36 NUM_LOW_LAT_UUARS = 4, 37 }; 38 39 int mlx5_cmd_alloc_uar(struct mlx5_core_dev *dev, u32 *uarn) 40 { 41 u32 in[MLX5_ST_SZ_DW(alloc_uar_in)]; 42 u32 out[MLX5_ST_SZ_DW(alloc_uar_out)]; 43 int err; 44 45 memset(in, 0, sizeof(in)); 46 47 MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR); 48 49 memset(out, 0, sizeof(out)); 50 err = mlx5_cmd_exec_check_status(dev, in, sizeof(in), out, sizeof(out)); 51 if (err) 52 return err; 53 54 *uarn = MLX5_GET(alloc_uar_out, out, uar); 55 56 return 0; 57 } 58 EXPORT_SYMBOL(mlx5_cmd_alloc_uar); 59 60 int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn) 61 { 62 u32 in[MLX5_ST_SZ_DW(dealloc_uar_in)]; 63 u32 out[MLX5_ST_SZ_DW(dealloc_uar_out)]; 64 65 memset(in, 0, sizeof(in)); 66 67 MLX5_SET(dealloc_uar_in, in, opcode, MLX5_CMD_OP_DEALLOC_UAR); 68 MLX5_SET(dealloc_uar_in, in, uar, uarn); 69 70 memset(out, 0, sizeof(out)); 71 return mlx5_cmd_exec_check_status(dev, in, sizeof(in), 72 out, sizeof(out)); 73 } 74 EXPORT_SYMBOL(mlx5_cmd_free_uar); 75 76 static int need_uuar_lock(int uuarn) 77 { 78 int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE; 79 80 if (uuarn == 0 || tot_uuars - NUM_LOW_LAT_UUARS) 81 return 0; 82 83 return 1; 84 } 85 86 int mlx5_alloc_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari) 87 { 88 int tot_uuars = NUM_DRIVER_UARS * MLX5_BF_REGS_PER_PAGE; 89 struct mlx5_bf *bf; 90 phys_addr_t addr; 91 int err; 92 int i; 93 94 uuari->num_uars = NUM_DRIVER_UARS; 95 uuari->num_low_latency_uuars = NUM_LOW_LAT_UUARS; 96 97 mutex_init(&uuari->lock); 98 uuari->uars = kcalloc(uuari->num_uars, sizeof(*uuari->uars), GFP_KERNEL); 99 100 uuari->bfs = kcalloc(tot_uuars, sizeof(*uuari->bfs), GFP_KERNEL); 101 102 uuari->bitmap = kcalloc(BITS_TO_LONGS(tot_uuars), sizeof(*uuari->bitmap), 103 GFP_KERNEL); 104 105 uuari->count = kcalloc(tot_uuars, sizeof(*uuari->count), GFP_KERNEL); 106 107 for (i = 0; i < uuari->num_uars; i++) { 108 err = mlx5_cmd_alloc_uar(dev, &uuari->uars[i].index); 109 if (err) 110 goto out_count; 111 112 addr = pci_resource_start(dev->pdev, 0) + 113 ((phys_addr_t)(uuari->uars[i].index) << PAGE_SHIFT); 114 uuari->uars[i].map = ioremap(addr, PAGE_SIZE); 115 if (!uuari->uars[i].map) { 116 mlx5_cmd_free_uar(dev, uuari->uars[i].index); 117 err = -ENOMEM; 118 goto out_count; 119 } 120 mlx5_core_dbg(dev, "allocated uar index 0x%x, mmaped at %p\n", 121 uuari->uars[i].index, uuari->uars[i].map); 122 } 123 124 for (i = 0; i < tot_uuars; i++) { 125 bf = &uuari->bfs[i]; 126 127 bf->buf_size = (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) / 2; 128 bf->uar = &uuari->uars[i / MLX5_BF_REGS_PER_PAGE]; 129 bf->regreg = uuari->uars[i / MLX5_BF_REGS_PER_PAGE].map; 130 bf->reg = NULL; /* Add WC support */ 131 bf->offset = (i % MLX5_BF_REGS_PER_PAGE) * 132 (1 << MLX5_CAP_GEN(dev, log_bf_reg_size)) + 133 MLX5_BF_OFFSET; 134 bf->need_lock = need_uuar_lock(i); 135 spin_lock_init(&bf->lock); 136 spin_lock_init(&bf->lock32); 137 bf->uuarn = i; 138 } 139 140 return 0; 141 142 out_count: 143 for (i--; i >= 0; i--) { 144 iounmap(uuari->uars[i].map); 145 mlx5_cmd_free_uar(dev, uuari->uars[i].index); 146 } 147 kfree(uuari->count); 148 149 kfree(uuari->bitmap); 150 151 kfree(uuari->bfs); 152 153 kfree(uuari->uars); 154 return err; 155 } 156 157 int mlx5_free_uuars(struct mlx5_core_dev *dev, struct mlx5_uuar_info *uuari) 158 { 159 int i = uuari->num_uars; 160 161 for (i--; i >= 0; i--) { 162 iounmap(uuari->uars[i].map); 163 mlx5_cmd_free_uar(dev, uuari->uars[i].index); 164 } 165 166 kfree(uuari->count); 167 kfree(uuari->bitmap); 168 kfree(uuari->bfs); 169 kfree(uuari->uars); 170 171 return 0; 172 } 173 174 int mlx5_alloc_map_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar) 175 { 176 phys_addr_t pfn; 177 phys_addr_t uar_bar_start; 178 int err; 179 180 err = mlx5_cmd_alloc_uar(mdev, &uar->index); 181 if (err) { 182 mlx5_core_warn(mdev, "mlx5_cmd_alloc_uar() failed, %d\n", err); 183 return err; 184 } 185 186 uar_bar_start = pci_resource_start(mdev->pdev, 0); 187 pfn = (uar_bar_start >> PAGE_SHIFT) + uar->index; 188 uar->map = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); 189 if (!uar->map) { 190 mlx5_core_warn(mdev, "ioremap() failed, %d\n", err); 191 err = -ENOMEM; 192 goto err_free_uar; 193 } 194 195 if (mdev->priv.bf_mapping) 196 uar->bf_map = io_mapping_map_wc(mdev->priv.bf_mapping, 197 uar->index << PAGE_SHIFT); 198 199 return 0; 200 201 err_free_uar: 202 mlx5_cmd_free_uar(mdev, uar->index); 203 204 return err; 205 } 206 EXPORT_SYMBOL(mlx5_alloc_map_uar); 207 208 void mlx5_unmap_free_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar) 209 { 210 io_mapping_unmap(uar->bf_map); 211 iounmap(uar->map); 212 mlx5_cmd_free_uar(mdev, uar->index); 213 } 214 EXPORT_SYMBOL(mlx5_unmap_free_uar); 215