Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 1 | /* |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 2 | * Copyright 2020-2023 Arm Limited and/or its affiliates |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 3 | * |
| 4 | * This program is free software and is provided to you under the terms of the |
| 5 | * GNU General Public License version 2 as published by the Free Software |
| 6 | * Foundation, and any use by you of this program is subject to the terms |
| 7 | * of such GNU licence. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, you can access it online at |
| 16 | * http://www.gnu.org/licenses/gpl-2.0.html. |
| 17 | * |
| 18 | * SPDX-License-Identifier: GPL-2.0-only |
| 19 | */ |
| 20 | |
| 21 | /**************************************************************************** |
| 22 | * Includes |
| 23 | ****************************************************************************/ |
| 24 | |
| 25 | #include "ethosu_buffer.h" |
| 26 | |
| 27 | #include "ethosu_device.h" |
| 28 | #include "uapi/ethosu.h" |
| 29 | |
| 30 | #include <linux/anon_inodes.h> |
| 31 | #include <linux/dma-mapping.h> |
| 32 | #include <linux/of_address.h> |
| 33 | #include <linux/file.h> |
| 34 | #include <linux/fs.h> |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 35 | #include <linux/remoteproc.h> |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 36 | #include <linux/uaccess.h> |
| 37 | |
| 38 | /**************************************************************************** |
| 39 | * Variables |
| 40 | ****************************************************************************/ |
| 41 | |
| 42 | static int ethosu_buffer_release(struct inode *inode, |
| 43 | struct file *file); |
| 44 | |
| 45 | static int ethosu_buffer_mmap(struct file *file, |
| 46 | struct vm_area_struct *vma); |
| 47 | |
| 48 | static long ethosu_buffer_ioctl(struct file *file, |
| 49 | unsigned int cmd, |
| 50 | unsigned long arg); |
| 51 | |
| 52 | static const struct file_operations ethosu_buffer_fops = { |
| 53 | .release = ðosu_buffer_release, |
| 54 | .mmap = ðosu_buffer_mmap, |
| 55 | .unlocked_ioctl = ðosu_buffer_ioctl, |
| 56 | #ifdef CONFIG_COMPAT |
| 57 | .compat_ioctl = ðosu_buffer_ioctl, |
| 58 | #endif |
| 59 | }; |
| 60 | |
| 61 | /**************************************************************************** |
| 62 | * Functions |
| 63 | ****************************************************************************/ |
| 64 | |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 65 | static bool ethosu_buffer_verify(struct file *file) |
| 66 | { |
| 67 | return file->f_op == ðosu_buffer_fops; |
| 68 | } |
| 69 | |
| 70 | static void ethosu_buffer_destroy(struct kref *kref) |
| 71 | { |
| 72 | struct ethosu_buffer *buf = |
| 73 | container_of(kref, struct ethosu_buffer, kref); |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 74 | struct device *dev = buf->dev; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 75 | |
Kristofer Jonsson | 074ef90 | 2023-01-23 13:05:36 +0100 | [diff] [blame] | 76 | dev_info(dev, "Buffer destroy. buf=0x%pK", buf); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 77 | |
Mikael Olsson | 1182f38 | 2023-08-10 13:25:44 +0200 | [diff] [blame] | 78 | memset(buf->cpu_addr, 0, buf->capacity); |
Kristofer Jonsson | 074ef90 | 2023-01-23 13:05:36 +0100 | [diff] [blame] | 79 | dma_free_coherent(dev, buf->capacity, buf->cpu_addr, |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 80 | buf->dma_addr); |
Kristofer Jonsson | 53fd03d | 2022-06-21 16:58:45 +0200 | [diff] [blame] | 81 | |
Mikael Olsson | 1182f38 | 2023-08-10 13:25:44 +0200 | [diff] [blame] | 82 | memset(buf, 0, sizeof(*buf)); |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 83 | devm_kfree(dev, buf); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | static int ethosu_buffer_release(struct inode *inode, |
| 87 | struct file *file) |
| 88 | { |
| 89 | struct ethosu_buffer *buf = file->private_data; |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 90 | struct device *dev = buf->dev; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 91 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 92 | dev_info(dev, "Buffer release. file=0x%pK, buf=0x%pK\n", |
Kristofer Jonsson | 53fd03d | 2022-06-21 16:58:45 +0200 | [diff] [blame] | 93 | file, buf); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 94 | |
| 95 | ethosu_buffer_put(buf); |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | static int ethosu_buffer_mmap(struct file *file, |
| 101 | struct vm_area_struct *vma) |
| 102 | { |
| 103 | struct ethosu_buffer *buf = file->private_data; |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 104 | struct device *dev = buf->dev; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 105 | int ret; |
| 106 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 107 | dev_info(dev, "Buffer mmap. file=0x%pK, buf=0x%pK\n", |
Kristofer Jonsson | 53fd03d | 2022-06-21 16:58:45 +0200 | [diff] [blame] | 108 | file, buf); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 109 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 110 | ret = dma_mmap_coherent(dev, vma, buf->cpu_addr, |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 111 | buf->dma_addr, buf->capacity); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 112 | |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | static long ethosu_buffer_ioctl(struct file *file, |
| 117 | unsigned int cmd, |
| 118 | unsigned long arg) |
| 119 | { |
| 120 | struct ethosu_buffer *buf = file->private_data; |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 121 | struct device *dev = buf->dev; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 122 | void __user *udata = (void __user *)arg; |
Mikael Olsson | 891156d | 2023-08-24 13:20:31 +0200 | [diff] [blame] | 123 | int ret; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 124 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 125 | ret = device_lock_interruptible(dev); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 126 | if (ret) |
| 127 | return ret; |
| 128 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 129 | dev_info(dev, |
Kristofer Jonsson | 53fd03d | 2022-06-21 16:58:45 +0200 | [diff] [blame] | 130 | "Buffer ioctl. file=0x%pK, buf=0x%pK, cmd=0x%x, arg=%lu\n", |
| 131 | file, buf, cmd, arg); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 132 | |
| 133 | switch (cmd) { |
| 134 | case ETHOSU_IOCTL_BUFFER_SET: { |
| 135 | struct ethosu_uapi_buffer uapi; |
| 136 | |
Mikael Olsson | 891156d | 2023-08-24 13:20:31 +0200 | [diff] [blame] | 137 | if (copy_from_user(&uapi, udata, sizeof(uapi))) { |
| 138 | ret = -EFAULT; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 139 | break; |
Mikael Olsson | 891156d | 2023-08-24 13:20:31 +0200 | [diff] [blame] | 140 | } |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 141 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 142 | dev_info(dev, |
Kristofer Jonsson | 53fd03d | 2022-06-21 16:58:45 +0200 | [diff] [blame] | 143 | "Buffer ioctl: Buffer set. size=%u, offset=%u\n", |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 144 | uapi.size, uapi.offset); |
| 145 | |
| 146 | ret = ethosu_buffer_resize(buf, uapi.size, uapi.offset); |
| 147 | break; |
| 148 | } |
| 149 | case ETHOSU_IOCTL_BUFFER_GET: { |
Mikael Olsson | ec90223 | 2023-08-24 13:28:19 +0200 | [diff] [blame] | 150 | struct ethosu_uapi_buffer uapi = { 0 }; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 151 | |
| 152 | uapi.size = buf->size; |
| 153 | uapi.offset = buf->offset; |
| 154 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 155 | dev_info(dev, |
Kristofer Jonsson | 53fd03d | 2022-06-21 16:58:45 +0200 | [diff] [blame] | 156 | "Buffer ioctl: Buffer get. size=%u, offset=%u\n", |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 157 | uapi.size, uapi.offset); |
| 158 | |
Mikael Olsson | 891156d | 2023-08-24 13:20:31 +0200 | [diff] [blame] | 159 | if (copy_to_user(udata, &uapi, sizeof(uapi))) { |
| 160 | ret = -EFAULT; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 161 | break; |
Mikael Olsson | 891156d | 2023-08-24 13:20:31 +0200 | [diff] [blame] | 162 | } |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 163 | |
| 164 | ret = 0; |
| 165 | break; |
| 166 | } |
| 167 | default: { |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 168 | dev_err(dev, "Invalid ioctl. cmd=%u, arg=%lu", |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 169 | cmd, arg); |
Mikael Olsson | 891156d | 2023-08-24 13:20:31 +0200 | [diff] [blame] | 170 | ret = -ENOIOCTLCMD; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 171 | break; |
| 172 | } |
| 173 | } |
| 174 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 175 | device_unlock(dev); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 176 | |
| 177 | return ret; |
| 178 | } |
| 179 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 180 | int ethosu_buffer_create(struct device *dev, |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 181 | size_t capacity) |
| 182 | { |
| 183 | struct ethosu_buffer *buf; |
| 184 | int ret = -ENOMEM; |
| 185 | |
Per Åstrand | f50f25e | 2022-05-18 09:12:15 +0200 | [diff] [blame] | 186 | if (!capacity) |
| 187 | return -EINVAL; |
| 188 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 189 | buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 190 | if (!buf) |
| 191 | return -ENOMEM; |
| 192 | |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 193 | buf->dev = dev; |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 194 | buf->capacity = capacity; |
| 195 | buf->offset = 0; |
| 196 | buf->size = 0; |
| 197 | kref_init(&buf->kref); |
| 198 | |
Kristofer Jonsson | 074ef90 | 2023-01-23 13:05:36 +0100 | [diff] [blame] | 199 | buf->cpu_addr = dma_alloc_coherent(dev, capacity, |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 200 | &buf->dma_addr, GFP_KERNEL); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 201 | if (!buf->cpu_addr) |
| 202 | goto free_buf; |
| 203 | |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 204 | ret = anon_inode_getfd("ethosu-buffer", ðosu_buffer_fops, buf, |
| 205 | O_RDWR | O_CLOEXEC); |
| 206 | if (ret < 0) |
| 207 | goto free_dma; |
| 208 | |
| 209 | buf->file = fget(ret); |
| 210 | fput(buf->file); |
| 211 | |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 212 | dev_info(dev, |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 213 | "Buffer create. file=0x%pK, fd=%d, buf=0x%pK, capacity=%zu, cpu_addr=0x%pK, dma_addr=0x%llx, phys_addr=0x%llx\n", |
Kristofer Jonsson | 53fd03d | 2022-06-21 16:58:45 +0200 | [diff] [blame] | 214 | buf->file, ret, buf, capacity, buf->cpu_addr, buf->dma_addr, |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 215 | virt_to_phys(buf->cpu_addr)); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 216 | |
| 217 | return ret; |
| 218 | |
| 219 | free_dma: |
Kristofer Jonsson | 074ef90 | 2023-01-23 13:05:36 +0100 | [diff] [blame] | 220 | dma_free_coherent(dev, buf->capacity, buf->cpu_addr, |
Kristofer Jonsson | d779a08 | 2023-01-04 17:09:47 +0100 | [diff] [blame] | 221 | buf->dma_addr); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 222 | |
| 223 | free_buf: |
Mikael Olsson | 1182f38 | 2023-08-10 13:25:44 +0200 | [diff] [blame] | 224 | memset(buf, 0, sizeof(*buf)); |
Kristofer Jonsson | ec47704 | 2023-01-20 13:38:13 +0100 | [diff] [blame] | 225 | devm_kfree(dev, buf); |
Kristofer Jonsson | 116a635 | 2020-08-20 17:25:23 +0200 | [diff] [blame] | 226 | |
| 227 | return ret; |
| 228 | } |
| 229 | |
| 230 | struct ethosu_buffer *ethosu_buffer_get_from_fd(int fd) |
| 231 | { |
| 232 | struct ethosu_buffer *buf; |
| 233 | struct file *file; |
| 234 | |
| 235 | file = fget(fd); |
| 236 | if (!file) |
| 237 | return ERR_PTR(-EINVAL); |
| 238 | |
| 239 | if (!ethosu_buffer_verify(file)) { |
| 240 | fput(file); |
| 241 | |
| 242 | return ERR_PTR(-EINVAL); |
| 243 | } |
| 244 | |
| 245 | buf = file->private_data; |
| 246 | ethosu_buffer_get(buf); |
| 247 | fput(file); |
| 248 | |
| 249 | return buf; |
| 250 | } |
| 251 | |
| 252 | void ethosu_buffer_get(struct ethosu_buffer *buf) |
| 253 | { |
| 254 | kref_get(&buf->kref); |
| 255 | } |
| 256 | |
| 257 | void ethosu_buffer_put(struct ethosu_buffer *buf) |
| 258 | { |
| 259 | kref_put(&buf->kref, ethosu_buffer_destroy); |
| 260 | } |
| 261 | |
| 262 | int ethosu_buffer_resize(struct ethosu_buffer *buf, |
| 263 | size_t size, |
| 264 | size_t offset) |
| 265 | { |
| 266 | if ((size + offset) > buf->capacity) |
| 267 | return -EINVAL; |
| 268 | |
| 269 | buf->size = size; |
| 270 | buf->offset = offset; |
| 271 | |
| 272 | return 0; |
| 273 | } |