diff options
Diffstat (limited to 'include/linux/virtio_config.h')
| -rw-r--r-- | include/linux/virtio_config.h | 47 |
1 files changed, 16 insertions, 31 deletions
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index d581b2914b34..475572e976fe 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -16,7 +16,7 @@ #define VIRTIO_CONFIG_S_FAILED 0x80 #ifdef __KERNEL__ -struct virtio_device; +#include <linux/virtio.h> /** * virtio_config_ops - operations for configuring a virtio device @@ -30,13 +30,11 @@ struct virtio_device; * offset: the offset of the configuration field * buf: the buffer to write the field value into. * len: the length of the buffer - * Note that contents are conventionally little-endian. * @set: write the value of a configuration field * vdev: the virtio_device * offset: the offset of the configuration field * buf: the buffer to read the field value from. * len: the length of the buffer - * Note that contents are conventionally little-endian. * @get_status: read the status byte * vdev: the virtio_device * Returns the status byte @@ -70,40 +68,27 @@ struct virtio_config_ops }; /** - * virtio_config_val - look for a feature and get a single virtio config. + * virtio_config_val - look for a feature and get a virtio config entry. * @vdev: the virtio device * @fbit: the feature bit * @offset: the type to search for. * @val: a pointer to the value to fill in. * * The return value is -ENOENT if the feature doesn't exist. Otherwise - * the value is endian-corrected and returned in v. */ -#define virtio_config_val(vdev, fbit, offset, v) ({ \ - int _err; \ - if ((vdev)->config->feature((vdev), (fbit))) { \ - __virtio_config_val((vdev), (offset), (v)); \ - _err = 0; \ - } else \ - _err = -ENOENT; \ - _err; \ -}) + * the config value is copied into whatever is pointed to by v. */ +#define virtio_config_val(vdev, fbit, offset, v) \ + virtio_config_buf((vdev), (fbit), (offset), (v), sizeof(v)) -/** - * __virtio_config_val - get a single virtio config without feature check. - * @vdev: the virtio device - * @offset: the type to search for. - * @val: a pointer to the value to fill in. - * - * The value is endian-corrected and returned in v. */ -#define __virtio_config_val(vdev, offset, v) do { \ - BUILD_BUG_ON(sizeof(*(v)) != 1 && sizeof(*(v)) != 2 \ - && sizeof(*(v)) != 4 && sizeof(*(v)) != 8); \ - (vdev)->config->get((vdev), (offset), (v), sizeof(*(v))); \ - switch (sizeof(*(v))) { \ - case 2: le16_to_cpus((__u16 *) v); break; \ - case 4: le32_to_cpus((__u32 *) v); break; \ - case 8: le64_to_cpus((__u64 *) v); break; \ - } \ -} while(0) +static inline int virtio_config_buf(struct virtio_device *vdev, + unsigned int fbit, + unsigned int offset, + void *buf, unsigned len) +{ + if (!vdev->config->feature(vdev, fbit)) + return -ENOENT; + + vdev->config->get(vdev, offset, buf, len); + return 0; +} #endif /* __KERNEL__ */ #endif /* _LINUX_VIRTIO_CONFIG_H */ |