diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/virtio_config.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/virtio_config.h | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/ANDROID_3.4.5/include/linux/virtio_config.h b/ANDROID_3.4.5/include/linux/virtio_config.h deleted file mode 100644 index 7323a339..00000000 --- a/ANDROID_3.4.5/include/linux/virtio_config.h +++ /dev/null @@ -1,203 +0,0 @@ -#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. - * - * 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 - * store and access that space differently. */ -#include <linux/types.h> - -/* Status byte for guest to report progress, and synchronize features. */ -/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */ -#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1 -/* We have found a driver for the device. */ -#define VIRTIO_CONFIG_S_DRIVER 2 -/* Driver has used its parts of the config, and is happy */ -#define VIRTIO_CONFIG_S_DRIVER_OK 4 -/* 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 - * 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 - -/* 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/err.h> -#include <linux/bug.h> -#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 - * @request_vqs: request the specified number of virtqueues - * vdev: the virtio_device - * max_vqs: the max number of virtqueues we want - * If supplied, must call before any virtqueues are instantiated. - * To modify the max number of virtqueues after request_vqs has been - * called, call free_vqs and then request_vqs with a new value. - * @free_vqs: cleanup resources allocated by request_vqs - * vdev: the virtio_device - * If supplied, must call after all virtqueues have been deleted. - * @reset: reset the device - * vdev: the virtio device - * After this, status and feature negotiation must be done again - * Device must not be reset from its vq/config callbacks, or in - * parallel with being added/removed. - * @find_vqs: find virtqueues and instantiate them. - * vdev: the virtio_device - * nvqs: the number of virtqueues to find - * vqs: on success, includes new virtqueues - * callbacks: array of callbacks, for each virtqueue - * names: array of virtqueue names (mainly for debugging) - * Returns 0 on success or error status - * @del_vqs: free virtqueues found by find_vqs(). - * @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. - * @bus_name: return the bus name associated with the device - * vdev: the virtio_device - * This returns a pointer to the bus name a la pci_name from which - * the caller can then copy. - */ -typedef void vq_callback_t(struct virtqueue *); -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); - int (*find_vqs)(struct virtio_device *, unsigned nvqs, - struct virtqueue *vqs[], - vq_callback_t *callbacks[], - const char *names[]); - void (*del_vqs)(struct virtio_device *); - u32 (*get_features)(struct virtio_device *vdev); - void (*finalize_features)(struct virtio_device *vdev); - const char *(*bus_name)(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); - else - BUG_ON(fbit >= 32); - - if (fbit < VIRTIO_TRANSPORT_F_START) - 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)) - -#define virtio_config_val_len(vdev, fbit, offset, v, len) \ - virtio_config_buf((vdev), (fbit), (offset), (v), (len)) - -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; - - vdev->config->get(vdev, offset, buf, len); - return 0; -} - -static inline -struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev, - vq_callback_t *c, const char *n) -{ - vq_callback_t *callbacks[] = { c }; - const char *names[] = { n }; - struct virtqueue *vq; - int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names); - if (err < 0) - return ERR_PTR(err); - return vq; -} - -static inline -const char *virtio_bus_name(struct virtio_device *vdev) -{ - if (!vdev->config->bus_name) - return "virtio"; - return vdev->config->bus_name(vdev); -} - -#endif /* __KERNEL__ */ -#endif /* _LINUX_VIRTIO_CONFIG_H */ |