diff options
Diffstat (limited to 'include/linux/virtio_config.h')
| -rw-r--r-- | include/linux/virtio_config.h | 76 |
1 files changed, 24 insertions, 52 deletions
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index fc457f452f64..29b9104232b4 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -1,60 +1,10 @@ #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> +#include <uapi/linux/virtio_config.h> /** * virtio_config_ops - operations for configuring a virtio device @@ -84,7 +34,9 @@ * nvqs: the number of virtqueues to find * vqs: on success, includes new virtqueues * callbacks: array of callbacks, for each virtqueue + * include a NULL entry for vqs that do not need a callback * names: array of virtqueue names (mainly for debugging) + * include a NULL entry for vqs unused by driver * 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. @@ -98,6 +50,7 @@ * vdev: the virtio_device * This returns a pointer to the bus name a la pci_name from which * the caller can then copy. + * @set_vq_affinity: set the affinity for a virtqueue. */ typedef void vq_callback_t(struct virtqueue *); struct virtio_config_ops { @@ -116,6 +69,7 @@ struct virtio_config_ops { u32 (*get_features)(struct virtio_device *vdev); void (*finalize_features)(struct virtio_device *vdev); const char *(*bus_name)(struct virtio_device *vdev); + int (*set_vq_affinity)(struct virtqueue *vq, int cpu); }; /* If driver didn't advertise the feature, it will never appear. */ @@ -190,5 +144,23 @@ const char *virtio_bus_name(struct virtio_device *vdev) return vdev->config->bus_name(vdev); } -#endif /* __KERNEL__ */ +/** + * virtqueue_set_affinity - setting affinity for a virtqueue + * @vq: the virtqueue + * @cpu: the cpu no. + * + * Pay attention the function are best-effort: the affinity hint may not be set + * due to config support, irq type and sharing. + * + */ +static inline +int virtqueue_set_affinity(struct virtqueue *vq, int cpu) +{ + struct virtio_device *vdev = vq->vdev; + if (vdev->config->set_vq_affinity) + return vdev->config->set_vq_affinity(vq, cpu); + return 0; +} + + #endif /* _LINUX_VIRTIO_CONFIG_H */ |