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 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 26 | #define DRIVER_VERSION "0.10" |
| 27 | #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" |
| 28 | #define DRIVER_DESC "VFIO platform base module" |
| 29 | |
Eric Auger | e086497 | 2015-11-03 18:12:13 +0000 | [diff] [blame] | 30 | static LIST_HEAD(reset_list); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 31 | static DEFINE_MUTEX(driver_lock); |
| 32 | |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame^] | 33 | static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat, |
| 34 | struct module **module) |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 35 | { |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame^] | 36 | struct vfio_platform_reset_node *iter; |
| 37 | vfio_platform_reset_fn_t reset_fn = NULL; |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 38 | |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame^] | 39 | mutex_lock(&driver_lock); |
| 40 | list_for_each_entry(iter, &reset_list, link) { |
| 41 | if (!strcmp(iter->compat, compat) && |
| 42 | try_module_get(iter->owner)) { |
| 43 | *module = iter->owner; |
| 44 | reset_fn = iter->reset; |
| 45 | break; |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 46 | } |
| 47 | } |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame^] | 48 | mutex_unlock(&driver_lock); |
| 49 | return reset_fn; |
| 50 | } |
| 51 | |
| 52 | static void vfio_platform_get_reset(struct vfio_platform_device *vdev) |
| 53 | { |
| 54 | char modname[256]; |
| 55 | |
| 56 | vdev->reset = vfio_platform_lookup_reset(vdev->compat, |
| 57 | &vdev->reset_module); |
| 58 | if (!vdev->reset) { |
| 59 | snprintf(modname, 256, "vfio-reset:%s", vdev->compat); |
| 60 | request_module(modname); |
| 61 | vdev->reset = vfio_platform_lookup_reset(vdev->compat, |
| 62 | &vdev->reset_module); |
| 63 | } |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | static void vfio_platform_put_reset(struct vfio_platform_device *vdev) |
| 67 | { |
| 68 | if (vdev->reset) |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame^] | 69 | module_put(vdev->reset_module); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 70 | } |
| 71 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 72 | static int vfio_platform_regions_init(struct vfio_platform_device *vdev) |
| 73 | { |
| 74 | int cnt = 0, i; |
| 75 | |
| 76 | while (vdev->get_resource(vdev, cnt)) |
| 77 | cnt++; |
| 78 | |
| 79 | vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region), |
| 80 | GFP_KERNEL); |
| 81 | if (!vdev->regions) |
| 82 | return -ENOMEM; |
| 83 | |
| 84 | for (i = 0; i < cnt; i++) { |
| 85 | struct resource *res = |
| 86 | vdev->get_resource(vdev, i); |
| 87 | |
| 88 | if (!res) |
| 89 | goto err; |
| 90 | |
| 91 | vdev->regions[i].addr = res->start; |
| 92 | vdev->regions[i].size = resource_size(res); |
| 93 | vdev->regions[i].flags = 0; |
| 94 | |
| 95 | switch (resource_type(res)) { |
| 96 | case IORESOURCE_MEM: |
| 97 | vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO; |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 98 | vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; |
| 99 | if (!(res->flags & IORESOURCE_READONLY)) |
| 100 | vdev->regions[i].flags |= |
| 101 | VFIO_REGION_INFO_FLAG_WRITE; |
Antonios Motakis | fad4d5b | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 102 | |
| 103 | /* |
| 104 | * Only regions addressed with PAGE granularity may be |
| 105 | * MMAPed securely. |
| 106 | */ |
| 107 | if (!(vdev->regions[i].addr & ~PAGE_MASK) && |
| 108 | !(vdev->regions[i].size & ~PAGE_MASK)) |
| 109 | vdev->regions[i].flags |= |
| 110 | VFIO_REGION_INFO_FLAG_MMAP; |
| 111 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 112 | break; |
| 113 | case IORESOURCE_IO: |
| 114 | vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO; |
| 115 | break; |
| 116 | default: |
| 117 | goto err; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | vdev->num_regions = cnt; |
| 122 | |
| 123 | return 0; |
| 124 | err: |
| 125 | kfree(vdev->regions); |
| 126 | return -EINVAL; |
| 127 | } |
| 128 | |
| 129 | static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev) |
| 130 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 131 | int i; |
| 132 | |
| 133 | for (i = 0; i < vdev->num_regions; i++) |
| 134 | iounmap(vdev->regions[i].ioaddr); |
| 135 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 136 | vdev->num_regions = 0; |
| 137 | kfree(vdev->regions); |
| 138 | } |
| 139 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 140 | static void vfio_platform_release(void *device_data) |
| 141 | { |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 142 | struct vfio_platform_device *vdev = device_data; |
| 143 | |
| 144 | mutex_lock(&driver_lock); |
| 145 | |
| 146 | if (!(--vdev->refcnt)) { |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 147 | if (vdev->reset) |
| 148 | vdev->reset(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 149 | vfio_platform_regions_cleanup(vdev); |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 150 | vfio_platform_irq_cleanup(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | mutex_unlock(&driver_lock); |
| 154 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 155 | module_put(vdev->parent_module); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | static int vfio_platform_open(void *device_data) |
| 159 | { |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 160 | struct vfio_platform_device *vdev = device_data; |
| 161 | int ret; |
| 162 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 163 | if (!try_module_get(vdev->parent_module)) |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 164 | return -ENODEV; |
| 165 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 166 | mutex_lock(&driver_lock); |
| 167 | |
| 168 | if (!vdev->refcnt) { |
| 169 | ret = vfio_platform_regions_init(vdev); |
| 170 | if (ret) |
| 171 | goto err_reg; |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 172 | |
| 173 | ret = vfio_platform_irq_init(vdev); |
| 174 | if (ret) |
| 175 | goto err_irq; |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 176 | |
| 177 | if (vdev->reset) |
| 178 | vdev->reset(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | vdev->refcnt++; |
| 182 | |
| 183 | mutex_unlock(&driver_lock); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 184 | return 0; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 185 | |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 186 | err_irq: |
| 187 | vfio_platform_regions_cleanup(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 188 | err_reg: |
| 189 | mutex_unlock(&driver_lock); |
| 190 | module_put(THIS_MODULE); |
| 191 | return ret; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | static long vfio_platform_ioctl(void *device_data, |
| 195 | unsigned int cmd, unsigned long arg) |
| 196 | { |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 197 | struct vfio_platform_device *vdev = device_data; |
| 198 | unsigned long minsz; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 199 | |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 200 | if (cmd == VFIO_DEVICE_GET_INFO) { |
| 201 | struct vfio_device_info info; |
| 202 | |
| 203 | minsz = offsetofend(struct vfio_device_info, num_irqs); |
| 204 | |
| 205 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 206 | return -EFAULT; |
| 207 | |
| 208 | if (info.argsz < minsz) |
| 209 | return -EINVAL; |
| 210 | |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 211 | if (vdev->reset) |
| 212 | vdev->flags |= VFIO_DEVICE_FLAGS_RESET; |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 213 | info.flags = vdev->flags; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 214 | info.num_regions = vdev->num_regions; |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 215 | info.num_irqs = vdev->num_irqs; |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 216 | |
| 217 | return copy_to_user((void __user *)arg, &info, minsz); |
| 218 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 219 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { |
| 220 | struct vfio_region_info info; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 221 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 222 | minsz = offsetofend(struct vfio_region_info, offset); |
| 223 | |
| 224 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 225 | return -EFAULT; |
| 226 | |
| 227 | if (info.argsz < minsz) |
| 228 | return -EINVAL; |
| 229 | |
| 230 | if (info.index >= vdev->num_regions) |
| 231 | return -EINVAL; |
| 232 | |
| 233 | /* map offset to the physical address */ |
| 234 | info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index); |
| 235 | info.size = vdev->regions[info.index].size; |
| 236 | info.flags = vdev->regions[info.index].flags; |
| 237 | |
| 238 | return copy_to_user((void __user *)arg, &info, minsz); |
| 239 | |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 240 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { |
| 241 | struct vfio_irq_info info; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 242 | |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 243 | minsz = offsetofend(struct vfio_irq_info, count); |
| 244 | |
| 245 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 246 | return -EFAULT; |
| 247 | |
| 248 | if (info.argsz < minsz) |
| 249 | return -EINVAL; |
| 250 | |
| 251 | if (info.index >= vdev->num_irqs) |
| 252 | return -EINVAL; |
| 253 | |
| 254 | info.flags = vdev->irqs[info.index].flags; |
| 255 | info.count = vdev->irqs[info.index].count; |
| 256 | |
| 257 | return copy_to_user((void __user *)arg, &info, minsz); |
| 258 | |
Antonios Motakis | 9a36321 | 2015-03-16 14:08:49 -0600 | [diff] [blame] | 259 | } else if (cmd == VFIO_DEVICE_SET_IRQS) { |
| 260 | struct vfio_irq_set hdr; |
| 261 | u8 *data = NULL; |
| 262 | int ret = 0; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 263 | |
Antonios Motakis | 9a36321 | 2015-03-16 14:08:49 -0600 | [diff] [blame] | 264 | minsz = offsetofend(struct vfio_irq_set, count); |
| 265 | |
| 266 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) |
| 267 | return -EFAULT; |
| 268 | |
| 269 | if (hdr.argsz < minsz) |
| 270 | return -EINVAL; |
| 271 | |
| 272 | if (hdr.index >= vdev->num_irqs) |
| 273 | return -EINVAL; |
| 274 | |
| 275 | if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | |
| 276 | VFIO_IRQ_SET_ACTION_TYPE_MASK)) |
| 277 | return -EINVAL; |
| 278 | |
| 279 | if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) { |
| 280 | size_t size; |
| 281 | |
| 282 | if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL) |
| 283 | size = sizeof(uint8_t); |
| 284 | else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD) |
| 285 | size = sizeof(int32_t); |
| 286 | else |
| 287 | return -EINVAL; |
| 288 | |
| 289 | if (hdr.argsz - minsz < size) |
| 290 | return -EINVAL; |
| 291 | |
| 292 | data = memdup_user((void __user *)(arg + minsz), size); |
| 293 | if (IS_ERR(data)) |
| 294 | return PTR_ERR(data); |
| 295 | } |
| 296 | |
| 297 | mutex_lock(&vdev->igate); |
| 298 | |
| 299 | ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index, |
| 300 | hdr.start, hdr.count, data); |
| 301 | mutex_unlock(&vdev->igate); |
| 302 | kfree(data); |
| 303 | |
| 304 | return ret; |
| 305 | |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 306 | } else if (cmd == VFIO_DEVICE_RESET) { |
| 307 | if (vdev->reset) |
| 308 | return vdev->reset(vdev); |
| 309 | else |
| 310 | return -EINVAL; |
| 311 | } |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 312 | |
| 313 | return -ENOTTY; |
| 314 | } |
| 315 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 316 | static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg, |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 317 | char __user *buf, size_t count, |
| 318 | loff_t off) |
| 319 | { |
| 320 | unsigned int done = 0; |
| 321 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 322 | if (!reg->ioaddr) { |
| 323 | reg->ioaddr = |
| 324 | ioremap_nocache(reg->addr, reg->size); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 325 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 326 | if (!reg->ioaddr) |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 327 | return -ENOMEM; |
| 328 | } |
| 329 | |
| 330 | while (count) { |
| 331 | size_t filled; |
| 332 | |
| 333 | if (count >= 4 && !(off % 4)) { |
| 334 | u32 val; |
| 335 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 336 | val = ioread32(reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 337 | if (copy_to_user(buf, &val, 4)) |
| 338 | goto err; |
| 339 | |
| 340 | filled = 4; |
| 341 | } else if (count >= 2 && !(off % 2)) { |
| 342 | u16 val; |
| 343 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 344 | val = ioread16(reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 345 | if (copy_to_user(buf, &val, 2)) |
| 346 | goto err; |
| 347 | |
| 348 | filled = 2; |
| 349 | } else { |
| 350 | u8 val; |
| 351 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 352 | val = ioread8(reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 353 | if (copy_to_user(buf, &val, 1)) |
| 354 | goto err; |
| 355 | |
| 356 | filled = 1; |
| 357 | } |
| 358 | |
| 359 | |
| 360 | count -= filled; |
| 361 | done += filled; |
| 362 | off += filled; |
| 363 | buf += filled; |
| 364 | } |
| 365 | |
| 366 | return done; |
| 367 | err: |
| 368 | return -EFAULT; |
| 369 | } |
| 370 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 371 | static ssize_t vfio_platform_read(void *device_data, char __user *buf, |
| 372 | size_t count, loff_t *ppos) |
| 373 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 374 | struct vfio_platform_device *vdev = device_data; |
| 375 | unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
| 376 | loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
| 377 | |
| 378 | if (index >= vdev->num_regions) |
| 379 | return -EINVAL; |
| 380 | |
| 381 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)) |
| 382 | return -EINVAL; |
| 383 | |
| 384 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 385 | return vfio_platform_read_mmio(&vdev->regions[index], |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 386 | buf, count, off); |
| 387 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 388 | return -EINVAL; /* not implemented */ |
| 389 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 390 | return -EINVAL; |
| 391 | } |
| 392 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 393 | static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg, |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 394 | const char __user *buf, size_t count, |
| 395 | loff_t off) |
| 396 | { |
| 397 | unsigned int done = 0; |
| 398 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 399 | if (!reg->ioaddr) { |
| 400 | reg->ioaddr = |
| 401 | ioremap_nocache(reg->addr, reg->size); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 402 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 403 | if (!reg->ioaddr) |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 404 | return -ENOMEM; |
| 405 | } |
| 406 | |
| 407 | while (count) { |
| 408 | size_t filled; |
| 409 | |
| 410 | if (count >= 4 && !(off % 4)) { |
| 411 | u32 val; |
| 412 | |
| 413 | if (copy_from_user(&val, buf, 4)) |
| 414 | goto err; |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 415 | iowrite32(val, reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 416 | |
| 417 | filled = 4; |
| 418 | } else if (count >= 2 && !(off % 2)) { |
| 419 | u16 val; |
| 420 | |
| 421 | if (copy_from_user(&val, buf, 2)) |
| 422 | goto err; |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 423 | iowrite16(val, reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 424 | |
| 425 | filled = 2; |
| 426 | } else { |
| 427 | u8 val; |
| 428 | |
| 429 | if (copy_from_user(&val, buf, 1)) |
| 430 | goto err; |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 431 | iowrite8(val, reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 432 | |
| 433 | filled = 1; |
| 434 | } |
| 435 | |
| 436 | count -= filled; |
| 437 | done += filled; |
| 438 | off += filled; |
| 439 | buf += filled; |
| 440 | } |
| 441 | |
| 442 | return done; |
| 443 | err: |
| 444 | return -EFAULT; |
| 445 | } |
| 446 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 447 | static ssize_t vfio_platform_write(void *device_data, const char __user *buf, |
| 448 | size_t count, loff_t *ppos) |
| 449 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 450 | struct vfio_platform_device *vdev = device_data; |
| 451 | unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
| 452 | loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
| 453 | |
| 454 | if (index >= vdev->num_regions) |
| 455 | return -EINVAL; |
| 456 | |
| 457 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)) |
| 458 | return -EINVAL; |
| 459 | |
| 460 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 461 | return vfio_platform_write_mmio(&vdev->regions[index], |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 462 | buf, count, off); |
| 463 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 464 | return -EINVAL; /* not implemented */ |
| 465 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 466 | return -EINVAL; |
| 467 | } |
| 468 | |
Antonios Motakis | fad4d5b | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 469 | static int vfio_platform_mmap_mmio(struct vfio_platform_region region, |
| 470 | struct vm_area_struct *vma) |
| 471 | { |
| 472 | u64 req_len, pgoff, req_start; |
| 473 | |
| 474 | req_len = vma->vm_end - vma->vm_start; |
| 475 | pgoff = vma->vm_pgoff & |
| 476 | ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1); |
| 477 | req_start = pgoff << PAGE_SHIFT; |
| 478 | |
| 479 | if (region.size < PAGE_SIZE || req_start + req_len > region.size) |
| 480 | return -EINVAL; |
| 481 | |
| 482 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
| 483 | vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; |
| 484 | |
| 485 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
| 486 | req_len, vma->vm_page_prot); |
| 487 | } |
| 488 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 489 | static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma) |
| 490 | { |
Antonios Motakis | fad4d5b | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 491 | struct vfio_platform_device *vdev = device_data; |
| 492 | unsigned int index; |
| 493 | |
| 494 | index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT); |
| 495 | |
| 496 | if (vma->vm_end < vma->vm_start) |
| 497 | return -EINVAL; |
| 498 | if (!(vma->vm_flags & VM_SHARED)) |
| 499 | return -EINVAL; |
| 500 | if (index >= vdev->num_regions) |
| 501 | return -EINVAL; |
| 502 | if (vma->vm_start & ~PAGE_MASK) |
| 503 | return -EINVAL; |
| 504 | if (vma->vm_end & ~PAGE_MASK) |
| 505 | return -EINVAL; |
| 506 | |
| 507 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) |
| 508 | return -EINVAL; |
| 509 | |
| 510 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) |
| 511 | && (vma->vm_flags & VM_READ)) |
| 512 | return -EINVAL; |
| 513 | |
| 514 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) |
| 515 | && (vma->vm_flags & VM_WRITE)) |
| 516 | return -EINVAL; |
| 517 | |
| 518 | vma->vm_private_data = vdev; |
| 519 | |
| 520 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
| 521 | return vfio_platform_mmap_mmio(vdev->regions[index], vma); |
| 522 | |
| 523 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 524 | return -EINVAL; /* not implemented */ |
| 525 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 526 | return -EINVAL; |
| 527 | } |
| 528 | |
| 529 | static const struct vfio_device_ops vfio_platform_ops = { |
| 530 | .name = "vfio-platform", |
| 531 | .open = vfio_platform_open, |
| 532 | .release = vfio_platform_release, |
| 533 | .ioctl = vfio_platform_ioctl, |
| 534 | .read = vfio_platform_read, |
| 535 | .write = vfio_platform_write, |
| 536 | .mmap = vfio_platform_mmap, |
| 537 | }; |
| 538 | |
| 539 | int vfio_platform_probe_common(struct vfio_platform_device *vdev, |
| 540 | struct device *dev) |
| 541 | { |
| 542 | struct iommu_group *group; |
| 543 | int ret; |
| 544 | |
| 545 | if (!vdev) |
| 546 | return -EINVAL; |
| 547 | |
Eric Auger | 0628c4d | 2015-11-03 18:12:16 +0000 | [diff] [blame] | 548 | ret = device_property_read_string(dev, "compatible", &vdev->compat); |
| 549 | if (ret) { |
| 550 | pr_err("VFIO: cannot retrieve compat for %s\n", vdev->name); |
| 551 | return -EINVAL; |
| 552 | } |
| 553 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 554 | group = iommu_group_get(dev); |
| 555 | if (!group) { |
| 556 | pr_err("VFIO: No IOMMU group for device %s\n", vdev->name); |
| 557 | return -EINVAL; |
| 558 | } |
| 559 | |
| 560 | ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev); |
| 561 | if (ret) { |
| 562 | iommu_group_put(group); |
| 563 | return ret; |
| 564 | } |
| 565 | |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame^] | 566 | vfio_platform_get_reset(vdev); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 567 | |
Antonios Motakis | 9a36321 | 2015-03-16 14:08:49 -0600 | [diff] [blame] | 568 | mutex_init(&vdev->igate); |
| 569 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 570 | return 0; |
| 571 | } |
| 572 | EXPORT_SYMBOL_GPL(vfio_platform_probe_common); |
| 573 | |
| 574 | struct vfio_platform_device *vfio_platform_remove_common(struct device *dev) |
| 575 | { |
| 576 | struct vfio_platform_device *vdev; |
| 577 | |
| 578 | vdev = vfio_del_group_dev(dev); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 579 | |
| 580 | if (vdev) { |
| 581 | vfio_platform_put_reset(vdev); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 582 | iommu_group_put(dev->iommu_group); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 583 | } |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 584 | |
| 585 | return vdev; |
| 586 | } |
| 587 | EXPORT_SYMBOL_GPL(vfio_platform_remove_common); |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 588 | |
Eric Auger | e086497 | 2015-11-03 18:12:13 +0000 | [diff] [blame] | 589 | void __vfio_platform_register_reset(struct vfio_platform_reset_node *node) |
| 590 | { |
| 591 | mutex_lock(&driver_lock); |
| 592 | list_add(&node->link, &reset_list); |
| 593 | mutex_unlock(&driver_lock); |
| 594 | } |
| 595 | EXPORT_SYMBOL_GPL(__vfio_platform_register_reset); |
| 596 | |
| 597 | void vfio_platform_unregister_reset(const char *compat, |
| 598 | vfio_platform_reset_fn_t fn) |
| 599 | { |
| 600 | struct vfio_platform_reset_node *iter, *temp; |
| 601 | |
| 602 | mutex_lock(&driver_lock); |
| 603 | list_for_each_entry_safe(iter, temp, &reset_list, link) { |
| 604 | if (!strcmp(iter->compat, compat) && (iter->reset == fn)) { |
| 605 | list_del(&iter->link); |
| 606 | break; |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | mutex_unlock(&driver_lock); |
| 611 | |
| 612 | } |
| 613 | EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset); |
| 614 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 615 | MODULE_VERSION(DRIVER_VERSION); |
| 616 | MODULE_LICENSE("GPL v2"); |
| 617 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 618 | MODULE_DESCRIPTION(DRIVER_DESC); |