drivers/vfio/cdx/main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
   4  */
   5
   6 #include <linux/vfio.h>
   7 #include <linux/cdx/cdx_bus.h>
   8
   9 #include "private.h"
  10
  11 static int vfio_cdx_open_device(struct vfio_device *core_vdev)
  12 {
  13         struct vfio_cdx_device *vdev =
  14                 container_of(core_vdev, struct vfio_cdx_device, vdev);
  15         struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
  16         int count = cdx_dev->res_count;
  17         int i, ret;
  18
  19         vdev->regions = kcalloc(count, sizeof(struct vfio_cdx_region),
  20                                 GFP_KERNEL_ACCOUNT);
  21         if (!vdev->regions)
  22                 return -ENOMEM;
  23
  24         for (i = 0; i < count; i++) {
  25                 struct resource *res = &cdx_dev->res[i];
  26
  27                 vdev->regions[i].addr = res->start;
  28                 vdev->regions[i].size = resource_size(res);
  29                 vdev->regions[i].type = res->flags;
  30                 /*
  31                  * Only regions addressed with PAGE granularity may be
  32                  * MMAP'ed securely.
  33                  */
  34                 if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
  35                     !(vdev->regions[i].size & ~PAGE_MASK))
  36                         vdev->regions[i].flags |=
  37                                         VFIO_REGION_INFO_FLAG_MMAP;
  38                 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
  39                 if (!(cdx_dev->res[i].flags & IORESOURCE_READONLY))
  40                         vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;
  41         }
  42         ret = cdx_dev_reset(core_vdev->dev);
  43         if (ret) {
  44                 kfree(vdev->regions);
  45                 vdev->regions = NULL;
  46                 return ret;
  47         }
  48         ret = cdx_clear_master(cdx_dev);
  49         if (ret)
  50                 vdev->flags &= ~BME_SUPPORT;
  51         else
  52                 vdev->flags |= BME_SUPPORT;
  53
  54         return 0;
  55 }
  56
  57 static void vfio_cdx_close_device(struct vfio_device *core_vdev)
  58 {
  59         struct vfio_cdx_device *vdev =
  60                 container_of(core_vdev, struct vfio_cdx_device, vdev);
  61
  62         kfree(vdev->regions);
  63         cdx_dev_reset(core_vdev->dev);
  64         vfio_cdx_irqs_cleanup(vdev);
  65 }
  66
  67 static int vfio_cdx_bm_ctrl(struct vfio_device *core_vdev, u32 flags,
  68                             void __user *arg, size_t argsz)
  69 {
  70         size_t minsz =
  71                 offsetofend(struct vfio_device_feature_bus_master, op);
  72         struct vfio_cdx_device *vdev =
  73                 container_of(core_vdev, struct vfio_cdx_device, vdev);
  74         struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
  75         struct vfio_device_feature_bus_master ops;
  76         int ret;
  77
  78         if (!(vdev->flags & BME_SUPPORT))
  79                 return -ENOTTY;
  80
  81         ret = vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_SET,
  82                                  sizeof(ops));
  83         if (ret != 1)
  84                 return ret;
  85
  86         if (copy_from_user(&ops, arg, minsz))
  87                 return -EFAULT;
  88
  89         switch (ops.op) {
  90         case VFIO_DEVICE_FEATURE_CLEAR_MASTER:
  91                 return cdx_clear_master(cdx_dev);
  92         case VFIO_DEVICE_FEATURE_SET_MASTER:
  93                 return cdx_set_master(cdx_dev);
  94         default:
  95                 return -EINVAL;
  96         }
  97 }
  98
  99 static int vfio_cdx_ioctl_feature(struct vfio_device *device, u32 flags,
 100                                   void __user *arg, size_t argsz)
 101 {
 102         switch (flags & VFIO_DEVICE_FEATURE_MASK) {
 103         case VFIO_DEVICE_FEATURE_BUS_MASTER:
 104                 return vfio_cdx_bm_ctrl(device, flags, arg, argsz);
 105         default:
 106                 return -ENOTTY;
 107         }
 108 }
 109
 110 static int vfio_cdx_ioctl_get_info(struct vfio_cdx_device *vdev,
 111                                    struct vfio_device_info __user *arg)
 112 {
 113         unsigned long minsz = offsetofend(struct vfio_device_info, num_irqs);
 114         struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
 115         struct vfio_device_info info;
 116
 117         if (copy_from_user(&info, arg, minsz))
 118                 return -EFAULT;
 119
 120         if (info.argsz < minsz)
 121                 return -EINVAL;
 122
 123         info.flags = VFIO_DEVICE_FLAGS_CDX;
 124         info.flags |= VFIO_DEVICE_FLAGS_RESET;
 125
 126         info.num_regions = cdx_dev->res_count;
 127         info.num_irqs = cdx_dev->num_msi ? 1 : 0;
 128
 129         return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
 130 }
 131
 132 static int vfio_cdx_ioctl_get_region_info(struct vfio_cdx_device *vdev,
 133                                           struct vfio_region_info __user *arg)
 134 {
 135         unsigned long minsz = offsetofend(struct vfio_region_info, offset);
 136         struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
 137         struct vfio_region_info info;
 138
 139         if (copy_from_user(&info, arg, minsz))
 140                 return -EFAULT;
 141
 142         if (info.argsz < minsz)
 143                 return -EINVAL;
 144
 145         if (info.index >= cdx_dev->res_count)
 146                 return -EINVAL;
 147
 148         /* map offset to the physical address */
 149         info.offset = vfio_cdx_index_to_offset(info.index);
 150         info.size = vdev->regions[info.index].size;
 151         info.flags = vdev->regions[info.index].flags;
 152
 153         return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
 154 }
 155
 156 static int vfio_cdx_ioctl_get_irq_info(struct vfio_cdx_device *vdev,
 157                                        struct vfio_irq_info __user *arg)
 158 {
 159         unsigned long minsz = offsetofend(struct vfio_irq_info, count);
 160         struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
 161         struct vfio_irq_info info;
 162
 163         if (copy_from_user(&info, arg, minsz))
 164                 return -EFAULT;
 165
 166         if (info.argsz < minsz)
 167                 return -EINVAL;
 168
 169         if (info.index >= 1)
 170                 return -EINVAL;
 171
 172         if (!cdx_dev->num_msi)
 173                 return -EINVAL;
 174
 175         info.flags = VFIO_IRQ_INFO_EVENTFD | VFIO_IRQ_INFO_NORESIZE;
 176         info.count = cdx_dev->num_msi;
 177
 178         return copy_to_user(arg, &info, minsz) ? -EFAULT : 0;
 179 }
 180
 181 static int vfio_cdx_ioctl_set_irqs(struct vfio_cdx_device *vdev,
 182                                    struct vfio_irq_set __user *arg)
 183 {
 184         unsigned long minsz = offsetofend(struct vfio_irq_set, count);
 185         struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
 186         struct vfio_irq_set hdr;
 187         size_t data_size = 0;
 188         u8 *data = NULL;
 189         int ret = 0;
 190
 191         if (copy_from_user(&hdr, arg, minsz))
 192                 return -EFAULT;
 193
 194         ret = vfio_set_irqs_validate_and_prepare(&hdr, cdx_dev->num_msi,
 195                                                  1, &data_size);
 196         if (ret)
 197                 return ret;
 198
 199         if (data_size) {
 200                 data = memdup_user(arg->data, data_size);
 201                 if (IS_ERR(data))
 202                         return PTR_ERR(data);
 203         }
 204
 205         ret = vfio_cdx_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
 206                                       hdr.start, hdr.count, data);
 207         kfree(data);
 208
 209         return ret;
 210 }
 211
 212 static long vfio_cdx_ioctl(struct vfio_device *core_vdev,
 213                            unsigned int cmd, unsigned long arg)
 214 {
 215         struct vfio_cdx_device *vdev =
 216                 container_of(core_vdev, struct vfio_cdx_device, vdev);
 217         void __user *uarg = (void __user *)arg;
 218
 219         switch (cmd) {
 220         case VFIO_DEVICE_GET_INFO:
 221                 return vfio_cdx_ioctl_get_info(vdev, uarg);
 222         case VFIO_DEVICE_GET_REGION_INFO:
 223                 return vfio_cdx_ioctl_get_region_info(vdev, uarg);
 224         case VFIO_DEVICE_GET_IRQ_INFO:
 225                 return vfio_cdx_ioctl_get_irq_info(vdev, uarg);
 226         case VFIO_DEVICE_SET_IRQS:
 227                 return vfio_cdx_ioctl_set_irqs(vdev, uarg);
 228         case VFIO_DEVICE_RESET:
 229                 return cdx_dev_reset(core_vdev->dev);
 230         default:
 231                 return -ENOTTY;
 232         }
 233 }
 234
 235 static int vfio_cdx_mmap_mmio(struct vfio_cdx_region region,
 236                               struct vm_area_struct *vma)
 237 {
 238         u64 size = vma->vm_end - vma->vm_start;
 239         u64 pgoff, base;
 240
 241         pgoff = vma->vm_pgoff &
 242                 ((1U << (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
 243         base = pgoff << PAGE_SHIFT;
 244
 245         if (base + size > region.size)
 246                 return -EINVAL;
 247
 248         vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
 249         vma->vm_page_prot = pgprot_device(vma->vm_page_prot);
 250
 251         return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 252                                   size, vma->vm_page_prot);
 253 }
 254
 255 static int vfio_cdx_mmap(struct vfio_device *core_vdev,
 256                          struct vm_area_struct *vma)
 257 {
 258         struct vfio_cdx_device *vdev =
 259                 container_of(core_vdev, struct vfio_cdx_device, vdev);
 260         struct cdx_device *cdx_dev = to_cdx_device(core_vdev->dev);
 261         unsigned int index;
 262
 263         index = vma->vm_pgoff >> (VFIO_CDX_OFFSET_SHIFT - PAGE_SHIFT);
 264
 265         if (index >= cdx_dev->res_count)
 266                 return -EINVAL;
 267
 268         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
 269                 return -EINVAL;
 270
 271         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) &&
 272             (vma->vm_flags & VM_READ))
 273                 return -EPERM;
 274
 275         if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) &&
 276             (vma->vm_flags & VM_WRITE))
 277                 return -EPERM;
 278
 279         return vfio_cdx_mmap_mmio(vdev->regions[index], vma);
 280 }
 281
 282 static const struct vfio_device_ops vfio_cdx_ops = {
 283         .name           = "vfio-cdx",
 284         .open_device    = vfio_cdx_open_device,
 285         .close_device   = vfio_cdx_close_device,
 286         .ioctl          = vfio_cdx_ioctl,
 287         .device_feature = vfio_cdx_ioctl_feature,
 288         .mmap           = vfio_cdx_mmap,
 289         .bind_iommufd   = vfio_iommufd_physical_bind,
 290         .unbind_iommufd = vfio_iommufd_physical_unbind,
 291         .attach_ioas    = vfio_iommufd_physical_attach_ioas,
 292 };
 293
 294 static int vfio_cdx_probe(struct cdx_device *cdx_dev)
 295 {
 296         struct vfio_cdx_device *vdev;
 297         struct device *dev = &cdx_dev->dev;
 298         int ret;
 299
 300         vdev = vfio_alloc_device(vfio_cdx_device, vdev, dev,
 301                                  &vfio_cdx_ops);
 302         if (IS_ERR(vdev))
 303                 return PTR_ERR(vdev);
 304
 305         ret = vfio_register_group_dev(&vdev->vdev);
 306         if (ret)
 307                 goto out_uninit;
 308
 309         dev_set_drvdata(dev, vdev);
 310         return 0;
 311
 312 out_uninit:
 313         vfio_put_device(&vdev->vdev);
 314         return ret;
 315 }
 316
 317 static int vfio_cdx_remove(struct cdx_device *cdx_dev)
 318 {
 319         struct device *dev = &cdx_dev->dev;
 320         struct vfio_cdx_device *vdev = dev_get_drvdata(dev);
 321
 322         vfio_unregister_group_dev(&vdev->vdev);
 323         vfio_put_device(&vdev->vdev);
 324
 325         return 0;
 326 }
 327
 328 static const struct cdx_device_id vfio_cdx_table[] = {
 329         { CDX_DEVICE_DRIVER_OVERRIDE(CDX_ANY_ID, CDX_ANY_ID,
 330                                      CDX_ID_F_VFIO_DRIVER_OVERRIDE) }, /* match all by default */
 331         {}
 332 };
 333
 334 MODULE_DEVICE_TABLE(cdx, vfio_cdx_table);
 335
 336 static struct cdx_driver vfio_cdx_driver = {
 337         .probe          = vfio_cdx_probe,
 338         .remove         = vfio_cdx_remove,
 339         .match_id_table = vfio_cdx_table,
 340         .driver = {
 341                 .name   = "vfio-cdx",
 342         },
 343         .driver_managed_dma = true,
 344 };
 345
 346 module_driver(vfio_cdx_driver, cdx_driver_register, cdx_driver_unregister);
 347
 348 MODULE_LICENSE("GPL");
 349 MODULE_DESCRIPTION("VFIO for CDX devices - User Level meta-driver");
 350 MODULE_IMPORT_NS("CDX_BUS");