#ifndef _LINUX_VIRTIO_CONFIG_H
#define _LINUX_VIRTIO_CONFIG_H
/* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
- * anyone can use the definitions to implement compatible drivers/servers. */
+ * anyone can use the definitions to implement compatible drivers/servers.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of IBM nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE. */
/* Virtio devices use a standardized configuration space to define their
* features and pass configuration information, but each implementation can
#define VIRTIO_CONFIG_S_DRIVER 2
/* Driver has used its parts of the config, and is happy */
#define VIRTIO_CONFIG_S_DRIVER_OK 4
+/* Driver has finished configuring features */
+#define VIRTIO_CONFIG_S_FEATURES_OK 8
/* We've given up on this device. */
#define VIRTIO_CONFIG_S_FAILED 0x80
-/* Some virtio feature bits (currently bits 28 through 31) are reserved for the
+/* Some virtio feature bits (currently bits 28 through 32) are reserved for the
* transport being used (eg. virtio_ring), the rest are per-device feature
* bits. */
#define VIRTIO_TRANSPORT_F_START 28
-#define VIRTIO_TRANSPORT_F_END 32
+#define VIRTIO_TRANSPORT_F_END 33
+#ifndef VIRTIO_CONFIG_NO_LEGACY
/* Do we get callbacks when the ring is completely used, even if we've
* suppressed them? */
#define VIRTIO_F_NOTIFY_ON_EMPTY 24
-#ifdef __KERNEL__
-#include <linux/virtio.h>
-
-/**
- * virtio_config_ops - operations for configuring a virtio device
- * @get: read the value of a configuration field
- * vdev: the virtio_device
- * offset: the offset of the configuration field
- * buf: the buffer to write the field value into.
- * len: the length of the buffer
- * @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
- * @get_status: read the status byte
- * vdev: the virtio_device
- * Returns the status byte
- * @set_status: write the status byte
- * vdev: the virtio_device
- * status: the new status byte
- * @reset: reset the device
- * vdev: the virtio device
- * After this, status and feature negotiation must be done again
- * @find_vq: find a virtqueue and instantiate it.
- * vdev: the virtio_device
- * index: the 0-based virtqueue number in case there's more than one.
- * callback: the virqtueue callback
- * Returns the new virtqueue or ERR_PTR() (eg. -ENOENT).
- * @del_vq: free a virtqueue found by find_vq().
- * @get_features: get the array of feature bits for this device.
- * vdev: the virtio_device
- * Returns the first 32 feature bits (all we currently need).
- * @finalize_features: confirm what device features we'll be using.
- * vdev: the virtio_device
- * This gives the final feature bits for the device: it can change
- * the dev->feature bits if it wants.
- */
-struct virtio_config_ops
-{
- void (*get)(struct virtio_device *vdev, unsigned offset,
- void *buf, unsigned len);
- void (*set)(struct virtio_device *vdev, unsigned offset,
- const void *buf, unsigned len);
- u8 (*get_status)(struct virtio_device *vdev);
- void (*set_status)(struct virtio_device *vdev, u8 status);
- void (*reset)(struct virtio_device *vdev);
- struct virtqueue *(*find_vq)(struct virtio_device *vdev,
- unsigned index,
- void (*callback)(struct virtqueue *));
- void (*del_vq)(struct virtqueue *vq);
- u32 (*get_features)(struct virtio_device *vdev);
- void (*finalize_features)(struct virtio_device *vdev);
-};
-
-/* If driver didn't advertise the feature, it will never appear. */
-void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
- unsigned int fbit);
-
-/**
- * virtio_has_feature - helper to determine if this device has this feature.
- * @vdev: the device
- * @fbit: the feature bit
- */
-static inline bool virtio_has_feature(const struct virtio_device *vdev,
- unsigned int fbit)
-{
- /* Did you forget to fix assumptions on max features? */
- if (__builtin_constant_p(fbit))
- BUILD_BUG_ON(fbit >= 32);
-
- virtio_check_driver_offered_feature(vdev, fbit);
- return test_bit(fbit, vdev->features);
-}
-
-/**
- * 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 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))
+/* Can the device handle any descriptor layout? */
+#define VIRTIO_F_ANY_LAYOUT 27
+#endif /* VIRTIO_CONFIG_NO_LEGACY */
-static inline int virtio_config_buf(struct virtio_device *vdev,
- unsigned int fbit,
- unsigned int offset,
- void *buf, unsigned len)
-{
- if (!virtio_has_feature(vdev, fbit))
- return -ENOENT;
+/* v1.0 compliant. */
+#define VIRTIO_F_VERSION_1 32
- vdev->config->get(vdev, offset, buf, len);
- return 0;
-}
-#endif /* __KERNEL__ */
#endif /* _LINUX_VIRTIO_CONFIG_H */
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