Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 - Virtual Open Systems |
| 3 | * Author: Antonios Motakis <a.motakis@virtualopensystems.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2, as |
| 7 | * published by the Free Software Foundation. |
| 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 | |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/iommu.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/mutex.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/types.h> |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 21 | #include <linux/uaccess.h> |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 22 | #include <linux/vfio.h> |
| 23 | |
| 24 | #include "vfio_platform_private.h" |
| 25 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 26 | static DEFINE_MUTEX(driver_lock); |
| 27 | |
| 28 | static int vfio_platform_regions_init(struct vfio_platform_device *vdev) |
| 29 | { |
| 30 | int cnt = 0, i; |
| 31 | |
| 32 | while (vdev->get_resource(vdev, cnt)) |
| 33 | cnt++; |
| 34 | |
| 35 | vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region), |
| 36 | GFP_KERNEL); |
| 37 | if (!vdev->regions) |
| 38 | return -ENOMEM; |
| 39 | |
| 40 | for (i = 0; i < cnt; i++) { |
| 41 | struct resource *res = |
| 42 | vdev->get_resource(vdev, i); |
| 43 | |
| 44 | if (!res) |
| 45 | goto err; |
| 46 | |
| 47 | vdev->regions[i].addr = res->start; |
| 48 | vdev->regions[i].size = resource_size(res); |
| 49 | vdev->regions[i].flags = 0; |
| 50 | |
| 51 | switch (resource_type(res)) { |
| 52 | case IORESOURCE_MEM: |
| 53 | vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO; |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame^] | 54 | vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; |
| 55 | if (!(res->flags & IORESOURCE_READONLY)) |
| 56 | vdev->regions[i].flags |= |
| 57 | VFIO_REGION_INFO_FLAG_WRITE; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 58 | break; |
| 59 | case IORESOURCE_IO: |
| 60 | vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO; |
| 61 | break; |
| 62 | default: |
| 63 | goto err; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | vdev->num_regions = cnt; |
| 68 | |
| 69 | return 0; |
| 70 | err: |
| 71 | kfree(vdev->regions); |
| 72 | return -EINVAL; |
| 73 | } |
| 74 | |
| 75 | static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev) |
| 76 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame^] | 77 | int i; |
| 78 | |
| 79 | for (i = 0; i < vdev->num_regions; i++) |
| 80 | iounmap(vdev->regions[i].ioaddr); |
| 81 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 82 | vdev->num_regions = 0; |
| 83 | kfree(vdev->regions); |
| 84 | } |
| 85 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 86 | static void vfio_platform_release(void *device_data) |
| 87 | { |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 88 | struct vfio_platform_device *vdev = device_data; |
| 89 | |
| 90 | mutex_lock(&driver_lock); |
| 91 | |
| 92 | if (!(--vdev->refcnt)) { |
| 93 | vfio_platform_regions_cleanup(vdev); |
| 94 | } |
| 95 | |
| 96 | mutex_unlock(&driver_lock); |
| 97 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 98 | module_put(THIS_MODULE); |
| 99 | } |
| 100 | |
| 101 | static int vfio_platform_open(void *device_data) |
| 102 | { |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 103 | struct vfio_platform_device *vdev = device_data; |
| 104 | int ret; |
| 105 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 106 | if (!try_module_get(THIS_MODULE)) |
| 107 | return -ENODEV; |
| 108 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 109 | mutex_lock(&driver_lock); |
| 110 | |
| 111 | if (!vdev->refcnt) { |
| 112 | ret = vfio_platform_regions_init(vdev); |
| 113 | if (ret) |
| 114 | goto err_reg; |
| 115 | } |
| 116 | |
| 117 | vdev->refcnt++; |
| 118 | |
| 119 | mutex_unlock(&driver_lock); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 120 | return 0; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 121 | |
| 122 | err_reg: |
| 123 | mutex_unlock(&driver_lock); |
| 124 | module_put(THIS_MODULE); |
| 125 | return ret; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | static long vfio_platform_ioctl(void *device_data, |
| 129 | unsigned int cmd, unsigned long arg) |
| 130 | { |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 131 | struct vfio_platform_device *vdev = device_data; |
| 132 | unsigned long minsz; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 133 | |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 134 | if (cmd == VFIO_DEVICE_GET_INFO) { |
| 135 | struct vfio_device_info info; |
| 136 | |
| 137 | minsz = offsetofend(struct vfio_device_info, num_irqs); |
| 138 | |
| 139 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 140 | return -EFAULT; |
| 141 | |
| 142 | if (info.argsz < minsz) |
| 143 | return -EINVAL; |
| 144 | |
| 145 | info.flags = vdev->flags; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 146 | info.num_regions = vdev->num_regions; |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 147 | info.num_irqs = 0; |
| 148 | |
| 149 | return copy_to_user((void __user *)arg, &info, minsz); |
| 150 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 151 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { |
| 152 | struct vfio_region_info info; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 153 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 154 | minsz = offsetofend(struct vfio_region_info, offset); |
| 155 | |
| 156 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 157 | return -EFAULT; |
| 158 | |
| 159 | if (info.argsz < minsz) |
| 160 | return -EINVAL; |
| 161 | |
| 162 | if (info.index >= vdev->num_regions) |
| 163 | return -EINVAL; |
| 164 | |
| 165 | /* map offset to the physical address */ |
| 166 | info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index); |
| 167 | info.size = vdev->regions[info.index].size; |
| 168 | info.flags = vdev->regions[info.index].flags; |
| 169 | |
| 170 | return copy_to_user((void __user *)arg, &info, minsz); |
| 171 | |
| 172 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 173 | return -EINVAL; |
| 174 | |
| 175 | else if (cmd == VFIO_DEVICE_SET_IRQS) |
| 176 | return -EINVAL; |
| 177 | |
| 178 | else if (cmd == VFIO_DEVICE_RESET) |
| 179 | return -EINVAL; |
| 180 | |
| 181 | return -ENOTTY; |
| 182 | } |
| 183 | |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame^] | 184 | static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg, |
| 185 | char __user *buf, size_t count, |
| 186 | loff_t off) |
| 187 | { |
| 188 | unsigned int done = 0; |
| 189 | |
| 190 | if (!reg.ioaddr) { |
| 191 | reg.ioaddr = |
| 192 | ioremap_nocache(reg.addr, reg.size); |
| 193 | |
| 194 | if (!reg.ioaddr) |
| 195 | return -ENOMEM; |
| 196 | } |
| 197 | |
| 198 | while (count) { |
| 199 | size_t filled; |
| 200 | |
| 201 | if (count >= 4 && !(off % 4)) { |
| 202 | u32 val; |
| 203 | |
| 204 | val = ioread32(reg.ioaddr + off); |
| 205 | if (copy_to_user(buf, &val, 4)) |
| 206 | goto err; |
| 207 | |
| 208 | filled = 4; |
| 209 | } else if (count >= 2 && !(off % 2)) { |
| 210 | u16 val; |
| 211 | |
| 212 | val = ioread16(reg.ioaddr + off); |
| 213 | if (copy_to_user(buf, &val, 2)) |
| 214 | goto err; |
| 215 | |
| 216 | filled = 2; |
| 217 | } else { |
| 218 | u8 val; |
| 219 | |
| 220 | val = ioread8(reg.ioaddr + off); |
| 221 | if (copy_to_user(buf, &val, 1)) |
| 222 | goto err; |
| 223 | |
| 224 | filled = 1; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | count -= filled; |
| 229 | done += filled; |
| 230 | off += filled; |
| 231 | buf += filled; |
| 232 | } |
| 233 | |
| 234 | return done; |
| 235 | err: |
| 236 | return -EFAULT; |
| 237 | } |
| 238 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 239 | static ssize_t vfio_platform_read(void *device_data, char __user *buf, |
| 240 | size_t count, loff_t *ppos) |
| 241 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame^] | 242 | struct vfio_platform_device *vdev = device_data; |
| 243 | unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
| 244 | loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
| 245 | |
| 246 | if (index >= vdev->num_regions) |
| 247 | return -EINVAL; |
| 248 | |
| 249 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)) |
| 250 | return -EINVAL; |
| 251 | |
| 252 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
| 253 | return vfio_platform_read_mmio(vdev->regions[index], |
| 254 | buf, count, off); |
| 255 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 256 | return -EINVAL; /* not implemented */ |
| 257 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 258 | return -EINVAL; |
| 259 | } |
| 260 | |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame^] | 261 | static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg, |
| 262 | const char __user *buf, size_t count, |
| 263 | loff_t off) |
| 264 | { |
| 265 | unsigned int done = 0; |
| 266 | |
| 267 | if (!reg.ioaddr) { |
| 268 | reg.ioaddr = |
| 269 | ioremap_nocache(reg.addr, reg.size); |
| 270 | |
| 271 | if (!reg.ioaddr) |
| 272 | return -ENOMEM; |
| 273 | } |
| 274 | |
| 275 | while (count) { |
| 276 | size_t filled; |
| 277 | |
| 278 | if (count >= 4 && !(off % 4)) { |
| 279 | u32 val; |
| 280 | |
| 281 | if (copy_from_user(&val, buf, 4)) |
| 282 | goto err; |
| 283 | iowrite32(val, reg.ioaddr + off); |
| 284 | |
| 285 | filled = 4; |
| 286 | } else if (count >= 2 && !(off % 2)) { |
| 287 | u16 val; |
| 288 | |
| 289 | if (copy_from_user(&val, buf, 2)) |
| 290 | goto err; |
| 291 | iowrite16(val, reg.ioaddr + off); |
| 292 | |
| 293 | filled = 2; |
| 294 | } else { |
| 295 | u8 val; |
| 296 | |
| 297 | if (copy_from_user(&val, buf, 1)) |
| 298 | goto err; |
| 299 | iowrite8(val, reg.ioaddr + off); |
| 300 | |
| 301 | filled = 1; |
| 302 | } |
| 303 | |
| 304 | count -= filled; |
| 305 | done += filled; |
| 306 | off += filled; |
| 307 | buf += filled; |
| 308 | } |
| 309 | |
| 310 | return done; |
| 311 | err: |
| 312 | return -EFAULT; |
| 313 | } |
| 314 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 315 | static ssize_t vfio_platform_write(void *device_data, const char __user *buf, |
| 316 | size_t count, loff_t *ppos) |
| 317 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame^] | 318 | struct vfio_platform_device *vdev = device_data; |
| 319 | unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
| 320 | loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
| 321 | |
| 322 | if (index >= vdev->num_regions) |
| 323 | return -EINVAL; |
| 324 | |
| 325 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)) |
| 326 | return -EINVAL; |
| 327 | |
| 328 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
| 329 | return vfio_platform_write_mmio(vdev->regions[index], |
| 330 | buf, count, off); |
| 331 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 332 | return -EINVAL; /* not implemented */ |
| 333 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 334 | return -EINVAL; |
| 335 | } |
| 336 | |
| 337 | static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma) |
| 338 | { |
| 339 | return -EINVAL; |
| 340 | } |
| 341 | |
| 342 | static const struct vfio_device_ops vfio_platform_ops = { |
| 343 | .name = "vfio-platform", |
| 344 | .open = vfio_platform_open, |
| 345 | .release = vfio_platform_release, |
| 346 | .ioctl = vfio_platform_ioctl, |
| 347 | .read = vfio_platform_read, |
| 348 | .write = vfio_platform_write, |
| 349 | .mmap = vfio_platform_mmap, |
| 350 | }; |
| 351 | |
| 352 | int vfio_platform_probe_common(struct vfio_platform_device *vdev, |
| 353 | struct device *dev) |
| 354 | { |
| 355 | struct iommu_group *group; |
| 356 | int ret; |
| 357 | |
| 358 | if (!vdev) |
| 359 | return -EINVAL; |
| 360 | |
| 361 | group = iommu_group_get(dev); |
| 362 | if (!group) { |
| 363 | pr_err("VFIO: No IOMMU group for device %s\n", vdev->name); |
| 364 | return -EINVAL; |
| 365 | } |
| 366 | |
| 367 | ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev); |
| 368 | if (ret) { |
| 369 | iommu_group_put(group); |
| 370 | return ret; |
| 371 | } |
| 372 | |
| 373 | return 0; |
| 374 | } |
| 375 | EXPORT_SYMBOL_GPL(vfio_platform_probe_common); |
| 376 | |
| 377 | struct vfio_platform_device *vfio_platform_remove_common(struct device *dev) |
| 378 | { |
| 379 | struct vfio_platform_device *vdev; |
| 380 | |
| 381 | vdev = vfio_del_group_dev(dev); |
| 382 | if (vdev) |
| 383 | iommu_group_put(dev->iommu_group); |
| 384 | |
| 385 | return vdev; |
| 386 | } |
| 387 | EXPORT_SYMBOL_GPL(vfio_platform_remove_common); |