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> |
Sinan Kaya | a12a936 | 2016-07-19 09:01:44 -0400 | [diff] [blame^] | 16 | #include <linux/acpi.h> |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 17 | #include <linux/iommu.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/mutex.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/types.h> |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 23 | #include <linux/vfio.h> |
| 24 | |
| 25 | #include "vfio_platform_private.h" |
| 26 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 27 | #define DRIVER_VERSION "0.10" |
| 28 | #define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>" |
| 29 | #define DRIVER_DESC "VFIO platform base module" |
| 30 | |
Eric Auger | e086497 | 2015-11-03 18:12:13 +0000 | [diff] [blame] | 31 | static LIST_HEAD(reset_list); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 32 | static DEFINE_MUTEX(driver_lock); |
| 33 | |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 34 | static vfio_platform_reset_fn_t vfio_platform_lookup_reset(const char *compat, |
| 35 | struct module **module) |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 36 | { |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 37 | struct vfio_platform_reset_node *iter; |
| 38 | vfio_platform_reset_fn_t reset_fn = NULL; |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 39 | |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 40 | mutex_lock(&driver_lock); |
| 41 | list_for_each_entry(iter, &reset_list, link) { |
| 42 | if (!strcmp(iter->compat, compat) && |
| 43 | try_module_get(iter->owner)) { |
| 44 | *module = iter->owner; |
Sinan Kaya | 7aef80c | 2016-07-19 09:01:41 -0400 | [diff] [blame] | 45 | reset_fn = iter->of_reset; |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 46 | break; |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 47 | } |
| 48 | } |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 49 | mutex_unlock(&driver_lock); |
| 50 | return reset_fn; |
| 51 | } |
| 52 | |
Sinan Kaya | a12a936 | 2016-07-19 09:01:44 -0400 | [diff] [blame^] | 53 | static int vfio_platform_acpi_probe(struct vfio_platform_device *vdev, |
| 54 | struct device *dev) |
| 55 | { |
| 56 | struct acpi_device *adev; |
| 57 | |
| 58 | if (acpi_disabled) |
| 59 | return -ENOENT; |
| 60 | |
| 61 | adev = ACPI_COMPANION(dev); |
| 62 | if (!adev) { |
| 63 | pr_err("VFIO: ACPI companion device not found for %s\n", |
| 64 | vdev->name); |
| 65 | return -ENODEV; |
| 66 | } |
| 67 | |
| 68 | #ifdef CONFIG_ACPI |
| 69 | vdev->acpihid = acpi_device_hid(adev); |
| 70 | #endif |
| 71 | return WARN_ON(!vdev->acpihid) ? -EINVAL : 0; |
| 72 | } |
| 73 | |
Sinan Kaya | dc5542f | 2016-07-19 09:01:43 -0400 | [diff] [blame] | 74 | static bool vfio_platform_has_reset(struct vfio_platform_device *vdev) |
| 75 | { |
| 76 | return vdev->of_reset ? true : false; |
| 77 | } |
| 78 | |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 79 | static void vfio_platform_get_reset(struct vfio_platform_device *vdev) |
| 80 | { |
Sinan Kaya | 7aef80c | 2016-07-19 09:01:41 -0400 | [diff] [blame] | 81 | vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, |
| 82 | &vdev->reset_module); |
| 83 | if (!vdev->of_reset) { |
Kees Cook | 7200be7 | 2015-11-19 16:17:24 -0800 | [diff] [blame] | 84 | request_module("vfio-reset:%s", vdev->compat); |
Sinan Kaya | 7aef80c | 2016-07-19 09:01:41 -0400 | [diff] [blame] | 85 | vdev->of_reset = vfio_platform_lookup_reset(vdev->compat, |
| 86 | &vdev->reset_module); |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 87 | } |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static void vfio_platform_put_reset(struct vfio_platform_device *vdev) |
| 91 | { |
Sinan Kaya | 7aef80c | 2016-07-19 09:01:41 -0400 | [diff] [blame] | 92 | if (vdev->of_reset) |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 93 | module_put(vdev->reset_module); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 94 | } |
| 95 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 96 | static int vfio_platform_regions_init(struct vfio_platform_device *vdev) |
| 97 | { |
| 98 | int cnt = 0, i; |
| 99 | |
| 100 | while (vdev->get_resource(vdev, cnt)) |
| 101 | cnt++; |
| 102 | |
| 103 | vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region), |
| 104 | GFP_KERNEL); |
| 105 | if (!vdev->regions) |
| 106 | return -ENOMEM; |
| 107 | |
| 108 | for (i = 0; i < cnt; i++) { |
| 109 | struct resource *res = |
| 110 | vdev->get_resource(vdev, i); |
| 111 | |
| 112 | if (!res) |
| 113 | goto err; |
| 114 | |
| 115 | vdev->regions[i].addr = res->start; |
| 116 | vdev->regions[i].size = resource_size(res); |
| 117 | vdev->regions[i].flags = 0; |
| 118 | |
| 119 | switch (resource_type(res)) { |
| 120 | case IORESOURCE_MEM: |
| 121 | vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO; |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 122 | vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; |
| 123 | if (!(res->flags & IORESOURCE_READONLY)) |
| 124 | vdev->regions[i].flags |= |
| 125 | VFIO_REGION_INFO_FLAG_WRITE; |
Antonios Motakis | fad4d5b | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 126 | |
| 127 | /* |
| 128 | * Only regions addressed with PAGE granularity may be |
| 129 | * MMAPed securely. |
| 130 | */ |
| 131 | if (!(vdev->regions[i].addr & ~PAGE_MASK) && |
| 132 | !(vdev->regions[i].size & ~PAGE_MASK)) |
| 133 | vdev->regions[i].flags |= |
| 134 | VFIO_REGION_INFO_FLAG_MMAP; |
| 135 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 136 | break; |
| 137 | case IORESOURCE_IO: |
| 138 | vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO; |
| 139 | break; |
| 140 | default: |
| 141 | goto err; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | vdev->num_regions = cnt; |
| 146 | |
| 147 | return 0; |
| 148 | err: |
| 149 | kfree(vdev->regions); |
| 150 | return -EINVAL; |
| 151 | } |
| 152 | |
| 153 | static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev) |
| 154 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 155 | int i; |
| 156 | |
| 157 | for (i = 0; i < vdev->num_regions; i++) |
| 158 | iounmap(vdev->regions[i].ioaddr); |
| 159 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 160 | vdev->num_regions = 0; |
| 161 | kfree(vdev->regions); |
| 162 | } |
| 163 | |
Sinan Kaya | f084aa7 | 2016-07-19 09:01:42 -0400 | [diff] [blame] | 164 | static int vfio_platform_call_reset(struct vfio_platform_device *vdev) |
| 165 | { |
| 166 | if (vdev->of_reset) { |
| 167 | dev_info(vdev->device, "reset\n"); |
| 168 | return vdev->of_reset(vdev); |
| 169 | } |
| 170 | |
| 171 | dev_warn(vdev->device, "no reset function found!\n"); |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 175 | static void vfio_platform_release(void *device_data) |
| 176 | { |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 177 | struct vfio_platform_device *vdev = device_data; |
| 178 | |
| 179 | mutex_lock(&driver_lock); |
| 180 | |
| 181 | if (!(--vdev->refcnt)) { |
Sinan Kaya | f084aa7 | 2016-07-19 09:01:42 -0400 | [diff] [blame] | 182 | vfio_platform_call_reset(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 183 | vfio_platform_regions_cleanup(vdev); |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 184 | vfio_platform_irq_cleanup(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | mutex_unlock(&driver_lock); |
| 188 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 189 | module_put(vdev->parent_module); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | static int vfio_platform_open(void *device_data) |
| 193 | { |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 194 | struct vfio_platform_device *vdev = device_data; |
| 195 | int ret; |
| 196 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 197 | if (!try_module_get(vdev->parent_module)) |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 198 | return -ENODEV; |
| 199 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 200 | mutex_lock(&driver_lock); |
| 201 | |
| 202 | if (!vdev->refcnt) { |
| 203 | ret = vfio_platform_regions_init(vdev); |
| 204 | if (ret) |
| 205 | goto err_reg; |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 206 | |
| 207 | ret = vfio_platform_irq_init(vdev); |
| 208 | if (ret) |
| 209 | goto err_irq; |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 210 | |
Sinan Kaya | f084aa7 | 2016-07-19 09:01:42 -0400 | [diff] [blame] | 211 | vfio_platform_call_reset(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | vdev->refcnt++; |
| 215 | |
| 216 | mutex_unlock(&driver_lock); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 217 | return 0; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 218 | |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 219 | err_irq: |
| 220 | vfio_platform_regions_cleanup(vdev); |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 221 | err_reg: |
| 222 | mutex_unlock(&driver_lock); |
| 223 | module_put(THIS_MODULE); |
| 224 | return ret; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | static long vfio_platform_ioctl(void *device_data, |
| 228 | unsigned int cmd, unsigned long arg) |
| 229 | { |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 230 | struct vfio_platform_device *vdev = device_data; |
| 231 | unsigned long minsz; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 232 | |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 233 | if (cmd == VFIO_DEVICE_GET_INFO) { |
| 234 | struct vfio_device_info info; |
| 235 | |
| 236 | minsz = offsetofend(struct vfio_device_info, num_irqs); |
| 237 | |
| 238 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 239 | return -EFAULT; |
| 240 | |
| 241 | if (info.argsz < minsz) |
| 242 | return -EINVAL; |
| 243 | |
Sinan Kaya | dc5542f | 2016-07-19 09:01:43 -0400 | [diff] [blame] | 244 | if (vfio_platform_has_reset(vdev)) |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 245 | vdev->flags |= VFIO_DEVICE_FLAGS_RESET; |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 246 | info.flags = vdev->flags; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 247 | info.num_regions = vdev->num_regions; |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 248 | info.num_irqs = vdev->num_irqs; |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 249 | |
Michael S. Tsirkin | 8160c4e | 2016-02-28 16:31:39 +0200 | [diff] [blame] | 250 | return copy_to_user((void __user *)arg, &info, minsz) ? |
| 251 | -EFAULT : 0; |
Antonios Motakis | 2e8567b | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 252 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 253 | } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) { |
| 254 | struct vfio_region_info info; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 255 | |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 256 | minsz = offsetofend(struct vfio_region_info, offset); |
| 257 | |
| 258 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 259 | return -EFAULT; |
| 260 | |
| 261 | if (info.argsz < minsz) |
| 262 | return -EINVAL; |
| 263 | |
| 264 | if (info.index >= vdev->num_regions) |
| 265 | return -EINVAL; |
| 266 | |
| 267 | /* map offset to the physical address */ |
| 268 | info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index); |
| 269 | info.size = vdev->regions[info.index].size; |
| 270 | info.flags = vdev->regions[info.index].flags; |
| 271 | |
Michael S. Tsirkin | 8160c4e | 2016-02-28 16:31:39 +0200 | [diff] [blame] | 272 | return copy_to_user((void __user *)arg, &info, minsz) ? |
| 273 | -EFAULT : 0; |
Antonios Motakis | e8909e6 | 2015-03-16 14:08:46 -0600 | [diff] [blame] | 274 | |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 275 | } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) { |
| 276 | struct vfio_irq_info info; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 277 | |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 278 | minsz = offsetofend(struct vfio_irq_info, count); |
| 279 | |
| 280 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 281 | return -EFAULT; |
| 282 | |
| 283 | if (info.argsz < minsz) |
| 284 | return -EINVAL; |
| 285 | |
| 286 | if (info.index >= vdev->num_irqs) |
| 287 | return -EINVAL; |
| 288 | |
| 289 | info.flags = vdev->irqs[info.index].flags; |
| 290 | info.count = vdev->irqs[info.index].count; |
| 291 | |
Michael S. Tsirkin | 8160c4e | 2016-02-28 16:31:39 +0200 | [diff] [blame] | 292 | return copy_to_user((void __user *)arg, &info, minsz) ? |
| 293 | -EFAULT : 0; |
Antonios Motakis | 682704c | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 294 | |
Antonios Motakis | 9a36321 | 2015-03-16 14:08:49 -0600 | [diff] [blame] | 295 | } else if (cmd == VFIO_DEVICE_SET_IRQS) { |
| 296 | struct vfio_irq_set hdr; |
| 297 | u8 *data = NULL; |
| 298 | int ret = 0; |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 299 | |
Antonios Motakis | 9a36321 | 2015-03-16 14:08:49 -0600 | [diff] [blame] | 300 | minsz = offsetofend(struct vfio_irq_set, count); |
| 301 | |
| 302 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) |
| 303 | return -EFAULT; |
| 304 | |
| 305 | if (hdr.argsz < minsz) |
| 306 | return -EINVAL; |
| 307 | |
| 308 | if (hdr.index >= vdev->num_irqs) |
| 309 | return -EINVAL; |
| 310 | |
| 311 | if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | |
| 312 | VFIO_IRQ_SET_ACTION_TYPE_MASK)) |
| 313 | return -EINVAL; |
| 314 | |
| 315 | if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) { |
| 316 | size_t size; |
| 317 | |
| 318 | if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL) |
| 319 | size = sizeof(uint8_t); |
| 320 | else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD) |
| 321 | size = sizeof(int32_t); |
| 322 | else |
| 323 | return -EINVAL; |
| 324 | |
| 325 | if (hdr.argsz - minsz < size) |
| 326 | return -EINVAL; |
| 327 | |
| 328 | data = memdup_user((void __user *)(arg + minsz), size); |
| 329 | if (IS_ERR(data)) |
| 330 | return PTR_ERR(data); |
| 331 | } |
| 332 | |
| 333 | mutex_lock(&vdev->igate); |
| 334 | |
| 335 | ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index, |
| 336 | hdr.start, hdr.count, data); |
| 337 | mutex_unlock(&vdev->igate); |
| 338 | kfree(data); |
| 339 | |
| 340 | return ret; |
| 341 | |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 342 | } else if (cmd == VFIO_DEVICE_RESET) { |
Sinan Kaya | f084aa7 | 2016-07-19 09:01:42 -0400 | [diff] [blame] | 343 | return vfio_platform_call_reset(vdev); |
Eric Auger | 813ae660 | 2015-06-15 11:09:43 +0200 | [diff] [blame] | 344 | } |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 345 | |
| 346 | return -ENOTTY; |
| 347 | } |
| 348 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 349 | static ssize_t vfio_platform_read_mmio(struct vfio_platform_region *reg, |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 350 | char __user *buf, size_t count, |
| 351 | loff_t off) |
| 352 | { |
| 353 | unsigned int done = 0; |
| 354 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 355 | if (!reg->ioaddr) { |
| 356 | reg->ioaddr = |
| 357 | ioremap_nocache(reg->addr, reg->size); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 358 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 359 | if (!reg->ioaddr) |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 360 | return -ENOMEM; |
| 361 | } |
| 362 | |
| 363 | while (count) { |
| 364 | size_t filled; |
| 365 | |
| 366 | if (count >= 4 && !(off % 4)) { |
| 367 | u32 val; |
| 368 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 369 | val = ioread32(reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 370 | if (copy_to_user(buf, &val, 4)) |
| 371 | goto err; |
| 372 | |
| 373 | filled = 4; |
| 374 | } else if (count >= 2 && !(off % 2)) { |
| 375 | u16 val; |
| 376 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 377 | val = ioread16(reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 378 | if (copy_to_user(buf, &val, 2)) |
| 379 | goto err; |
| 380 | |
| 381 | filled = 2; |
| 382 | } else { |
| 383 | u8 val; |
| 384 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 385 | val = ioread8(reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 386 | if (copy_to_user(buf, &val, 1)) |
| 387 | goto err; |
| 388 | |
| 389 | filled = 1; |
| 390 | } |
| 391 | |
| 392 | |
| 393 | count -= filled; |
| 394 | done += filled; |
| 395 | off += filled; |
| 396 | buf += filled; |
| 397 | } |
| 398 | |
| 399 | return done; |
| 400 | err: |
| 401 | return -EFAULT; |
| 402 | } |
| 403 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 404 | static ssize_t vfio_platform_read(void *device_data, char __user *buf, |
| 405 | size_t count, loff_t *ppos) |
| 406 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 407 | struct vfio_platform_device *vdev = device_data; |
| 408 | unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
| 409 | loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
| 410 | |
| 411 | if (index >= vdev->num_regions) |
| 412 | return -EINVAL; |
| 413 | |
| 414 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)) |
| 415 | return -EINVAL; |
| 416 | |
| 417 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 418 | return vfio_platform_read_mmio(&vdev->regions[index], |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 419 | buf, count, off); |
| 420 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 421 | return -EINVAL; /* not implemented */ |
| 422 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 423 | return -EINVAL; |
| 424 | } |
| 425 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 426 | static ssize_t vfio_platform_write_mmio(struct vfio_platform_region *reg, |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 427 | const char __user *buf, size_t count, |
| 428 | loff_t off) |
| 429 | { |
| 430 | unsigned int done = 0; |
| 431 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 432 | if (!reg->ioaddr) { |
| 433 | reg->ioaddr = |
| 434 | ioremap_nocache(reg->addr, reg->size); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 435 | |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 436 | if (!reg->ioaddr) |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 437 | return -ENOMEM; |
| 438 | } |
| 439 | |
| 440 | while (count) { |
| 441 | size_t filled; |
| 442 | |
| 443 | if (count >= 4 && !(off % 4)) { |
| 444 | u32 val; |
| 445 | |
| 446 | if (copy_from_user(&val, buf, 4)) |
| 447 | goto err; |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 448 | iowrite32(val, reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 449 | |
| 450 | filled = 4; |
| 451 | } else if (count >= 2 && !(off % 2)) { |
| 452 | u16 val; |
| 453 | |
| 454 | if (copy_from_user(&val, buf, 2)) |
| 455 | goto err; |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 456 | iowrite16(val, reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 457 | |
| 458 | filled = 2; |
| 459 | } else { |
| 460 | u8 val; |
| 461 | |
| 462 | if (copy_from_user(&val, buf, 1)) |
| 463 | goto err; |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 464 | iowrite8(val, reg->ioaddr + off); |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 465 | |
| 466 | filled = 1; |
| 467 | } |
| 468 | |
| 469 | count -= filled; |
| 470 | done += filled; |
| 471 | off += filled; |
| 472 | buf += filled; |
| 473 | } |
| 474 | |
| 475 | return done; |
| 476 | err: |
| 477 | return -EFAULT; |
| 478 | } |
| 479 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 480 | static ssize_t vfio_platform_write(void *device_data, const char __user *buf, |
| 481 | size_t count, loff_t *ppos) |
| 482 | { |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 483 | struct vfio_platform_device *vdev = device_data; |
| 484 | unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos); |
| 485 | loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK; |
| 486 | |
| 487 | if (index >= vdev->num_regions) |
| 488 | return -EINVAL; |
| 489 | |
| 490 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)) |
| 491 | return -EINVAL; |
| 492 | |
| 493 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
James Morse | 1b4bb2e | 2015-10-29 16:50:43 +0000 | [diff] [blame] | 494 | return vfio_platform_write_mmio(&vdev->regions[index], |
Antonios Motakis | 6e3f264 | 2015-03-16 14:08:47 -0600 | [diff] [blame] | 495 | buf, count, off); |
| 496 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 497 | return -EINVAL; /* not implemented */ |
| 498 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 499 | return -EINVAL; |
| 500 | } |
| 501 | |
Antonios Motakis | fad4d5b | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 502 | static int vfio_platform_mmap_mmio(struct vfio_platform_region region, |
| 503 | struct vm_area_struct *vma) |
| 504 | { |
| 505 | u64 req_len, pgoff, req_start; |
| 506 | |
| 507 | req_len = vma->vm_end - vma->vm_start; |
| 508 | pgoff = vma->vm_pgoff & |
| 509 | ((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1); |
| 510 | req_start = pgoff << PAGE_SHIFT; |
| 511 | |
| 512 | if (region.size < PAGE_SIZE || req_start + req_len > region.size) |
| 513 | return -EINVAL; |
| 514 | |
| 515 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
| 516 | vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; |
| 517 | |
| 518 | return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, |
| 519 | req_len, vma->vm_page_prot); |
| 520 | } |
| 521 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 522 | static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma) |
| 523 | { |
Antonios Motakis | fad4d5b | 2015-03-16 14:08:48 -0600 | [diff] [blame] | 524 | struct vfio_platform_device *vdev = device_data; |
| 525 | unsigned int index; |
| 526 | |
| 527 | index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT); |
| 528 | |
| 529 | if (vma->vm_end < vma->vm_start) |
| 530 | return -EINVAL; |
| 531 | if (!(vma->vm_flags & VM_SHARED)) |
| 532 | return -EINVAL; |
| 533 | if (index >= vdev->num_regions) |
| 534 | return -EINVAL; |
| 535 | if (vma->vm_start & ~PAGE_MASK) |
| 536 | return -EINVAL; |
| 537 | if (vma->vm_end & ~PAGE_MASK) |
| 538 | return -EINVAL; |
| 539 | |
| 540 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) |
| 541 | return -EINVAL; |
| 542 | |
| 543 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) |
| 544 | && (vma->vm_flags & VM_READ)) |
| 545 | return -EINVAL; |
| 546 | |
| 547 | if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) |
| 548 | && (vma->vm_flags & VM_WRITE)) |
| 549 | return -EINVAL; |
| 550 | |
| 551 | vma->vm_private_data = vdev; |
| 552 | |
| 553 | if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO) |
| 554 | return vfio_platform_mmap_mmio(vdev->regions[index], vma); |
| 555 | |
| 556 | else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO) |
| 557 | return -EINVAL; /* not implemented */ |
| 558 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 559 | return -EINVAL; |
| 560 | } |
| 561 | |
| 562 | static const struct vfio_device_ops vfio_platform_ops = { |
| 563 | .name = "vfio-platform", |
| 564 | .open = vfio_platform_open, |
| 565 | .release = vfio_platform_release, |
| 566 | .ioctl = vfio_platform_ioctl, |
| 567 | .read = vfio_platform_read, |
| 568 | .write = vfio_platform_write, |
| 569 | .mmap = vfio_platform_mmap, |
| 570 | }; |
| 571 | |
Sinan Kaya | a12a936 | 2016-07-19 09:01:44 -0400 | [diff] [blame^] | 572 | int vfio_platform_of_probe(struct vfio_platform_device *vdev, |
| 573 | struct device *dev) |
| 574 | { |
| 575 | int ret; |
| 576 | |
| 577 | ret = device_property_read_string(dev, "compatible", |
| 578 | &vdev->compat); |
| 579 | if (ret) |
| 580 | pr_err("VFIO: cannot retrieve compat for %s\n", |
| 581 | vdev->name); |
| 582 | |
| 583 | return ret; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * There can be two kernel build combinations. One build where |
| 588 | * ACPI is not selected in Kconfig and another one with the ACPI Kconfig. |
| 589 | * |
| 590 | * In the first case, vfio_platform_acpi_probe will return since |
| 591 | * acpi_disabled is 1. DT user will not see any kind of messages from |
| 592 | * ACPI. |
| 593 | * |
| 594 | * In the second case, both DT and ACPI is compiled in but the system is |
| 595 | * booting with any of these combinations. |
| 596 | * |
| 597 | * If the firmware is DT type, then acpi_disabled is 1. The ACPI probe routine |
| 598 | * terminates immediately without any messages. |
| 599 | * |
| 600 | * If the firmware is ACPI type, then acpi_disabled is 0. All other checks are |
| 601 | * valid checks. We cannot claim that this system is DT. |
| 602 | */ |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 603 | int vfio_platform_probe_common(struct vfio_platform_device *vdev, |
| 604 | struct device *dev) |
| 605 | { |
| 606 | struct iommu_group *group; |
| 607 | int ret; |
| 608 | |
| 609 | if (!vdev) |
| 610 | return -EINVAL; |
| 611 | |
Sinan Kaya | a12a936 | 2016-07-19 09:01:44 -0400 | [diff] [blame^] | 612 | ret = vfio_platform_acpi_probe(vdev, dev); |
| 613 | if (ret) |
| 614 | ret = vfio_platform_of_probe(vdev, dev); |
| 615 | |
| 616 | if (ret) |
| 617 | return ret; |
Eric Auger | 0628c4d | 2015-11-03 18:12:16 +0000 | [diff] [blame] | 618 | |
Eric Auger | 705e60b | 2015-11-03 18:12:18 +0000 | [diff] [blame] | 619 | vdev->device = dev; |
| 620 | |
Peng Fan | 9698cbf | 2016-05-23 17:47:30 +0800 | [diff] [blame] | 621 | group = vfio_iommu_group_get(dev); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 622 | if (!group) { |
| 623 | pr_err("VFIO: No IOMMU group for device %s\n", vdev->name); |
| 624 | return -EINVAL; |
| 625 | } |
| 626 | |
| 627 | ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev); |
| 628 | if (ret) { |
Peng Fan | 9698cbf | 2016-05-23 17:47:30 +0800 | [diff] [blame] | 629 | vfio_iommu_group_put(group, dev); |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 630 | return ret; |
| 631 | } |
| 632 | |
Eric Auger | e9e0506 | 2015-11-03 18:12:17 +0000 | [diff] [blame] | 633 | vfio_platform_get_reset(vdev); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 634 | |
Antonios Motakis | 9a36321 | 2015-03-16 14:08:49 -0600 | [diff] [blame] | 635 | mutex_init(&vdev->igate); |
| 636 | |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 637 | return 0; |
| 638 | } |
| 639 | EXPORT_SYMBOL_GPL(vfio_platform_probe_common); |
| 640 | |
| 641 | struct vfio_platform_device *vfio_platform_remove_common(struct device *dev) |
| 642 | { |
| 643 | struct vfio_platform_device *vdev; |
| 644 | |
| 645 | vdev = vfio_del_group_dev(dev); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 646 | |
| 647 | if (vdev) { |
| 648 | vfio_platform_put_reset(vdev); |
Peng Fan | 9698cbf | 2016-05-23 17:47:30 +0800 | [diff] [blame] | 649 | vfio_iommu_group_put(dev->iommu_group, dev); |
Eric Auger | 3eeb0d5 | 2015-06-15 11:09:44 +0200 | [diff] [blame] | 650 | } |
Antonios Motakis | de49fc0 | 2015-03-16 14:08:42 -0600 | [diff] [blame] | 651 | |
| 652 | return vdev; |
| 653 | } |
| 654 | EXPORT_SYMBOL_GPL(vfio_platform_remove_common); |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 655 | |
Eric Auger | e086497 | 2015-11-03 18:12:13 +0000 | [diff] [blame] | 656 | void __vfio_platform_register_reset(struct vfio_platform_reset_node *node) |
| 657 | { |
| 658 | mutex_lock(&driver_lock); |
| 659 | list_add(&node->link, &reset_list); |
| 660 | mutex_unlock(&driver_lock); |
| 661 | } |
| 662 | EXPORT_SYMBOL_GPL(__vfio_platform_register_reset); |
| 663 | |
| 664 | void vfio_platform_unregister_reset(const char *compat, |
| 665 | vfio_platform_reset_fn_t fn) |
| 666 | { |
| 667 | struct vfio_platform_reset_node *iter, *temp; |
| 668 | |
| 669 | mutex_lock(&driver_lock); |
| 670 | list_for_each_entry_safe(iter, temp, &reset_list, link) { |
Sinan Kaya | 7aef80c | 2016-07-19 09:01:41 -0400 | [diff] [blame] | 671 | if (!strcmp(iter->compat, compat) && (iter->of_reset == fn)) { |
Eric Auger | e086497 | 2015-11-03 18:12:13 +0000 | [diff] [blame] | 672 | list_del(&iter->link); |
| 673 | break; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | mutex_unlock(&driver_lock); |
| 678 | |
| 679 | } |
| 680 | EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset); |
| 681 | |
Eric Auger | 32a2d71 | 2015-11-03 18:12:12 +0000 | [diff] [blame] | 682 | MODULE_VERSION(DRIVER_VERSION); |
| 683 | MODULE_LICENSE("GPL v2"); |
| 684 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 685 | MODULE_DESCRIPTION(DRIVER_DESC); |