tools/virtio/linux/virtio_config.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/virtio_byteorder.h>
   3 #include <linux/virtio.h>
   4 #include <uapi/linux/virtio_config.h>
   5
   6 /*
   7  * __virtio_test_bit - helper to test feature bits. For use by transports.
   8  *                     Devices should normally use virtio_has_feature,
   9  *                     which includes more checks.
  10  * @vdev: the device
  11  * @fbit: the feature bit
  12  */
  13 static inline bool __virtio_test_bit(const struct virtio_device *vdev,
  14                                      unsigned int fbit)
  15 {
  16         return vdev->features & (1ULL << fbit);
  17 }
  18
  19 /**
  20  * __virtio_set_bit - helper to set feature bits. For use by transports.
  21  * @vdev: the device
  22  * @fbit: the feature bit
  23  */
  24 static inline void __virtio_set_bit(struct virtio_device *vdev,
  25                                     unsigned int fbit)
  26 {
  27         vdev->features |= (1ULL << fbit);
  28 }
  29
  30 /**
  31  * __virtio_clear_bit - helper to clear feature bits. For use by transports.
  32  * @vdev: the device
  33  * @fbit: the feature bit
  34  */
  35 static inline void __virtio_clear_bit(struct virtio_device *vdev,
  36                                       unsigned int fbit)
  37 {
  38         vdev->features &= ~(1ULL << fbit);
  39 }
  40
  41 #define virtio_has_feature(dev, feature) \
  42         (__virtio_test_bit((dev), feature))
  43
  44 /**
  45  * virtio_has_iommu_quirk - determine whether this device has the iommu quirk
  46  * @vdev: the device
  47  */
  48 static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev)
  49 {
  50         /*
  51          * Note the reverse polarity of the quirk feature (compared to most
  52          * other features), this is for compatibility with legacy systems.
  53          */
  54         return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM);
  55 }
  56
  57 static inline bool virtio_is_little_endian(struct virtio_device *vdev)
  58 {
  59         return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
  60                 virtio_legacy_is_little_endian();
  61 }
  62
  63 /* Memory accessors */
  64 static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
  65 {
  66         return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
  67 }
  68
  69 static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
  70 {
  71         return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
  72 }
  73
  74 static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
  75 {
  76         return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
  77 }
  78
  79 static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
  80 {
  81         return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
  82 }
  83
  84 static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
  85 {
  86         return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
  87 }
  88
  89 static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
  90 {
  91         return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
  92 }