WSL2-Linux-Kernel/include/uapi/linux/virtio_scmi.h

/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
/*
 * Copyright (C) 2020-2021 OpenSynergy GmbH
 * Copyright (C) 2021 ARM Ltd.
 */

#ifndef _UAPI_LINUX_VIRTIO_SCMI_H
#define _UAPI_LINUX_VIRTIO_SCMI_H

#include <linux/virtio_types.h>

/* Device implements some SCMI notifications, or delayed responses. */
#define VIRTIO_SCMI_F_P2A_CHANNELS 0

/* Device implements any SCMI statistics shared memory region */
#define VIRTIO_SCMI_F_SHARED_MEMORY 1

/* Virtqueues */

#define VIRTIO_SCMI_VQ_TX 0 /* cmdq */
#define VIRTIO_SCMI_VQ_RX 1 /* eventq */
#define VIRTIO_SCMI_VQ_MAX_CNT 2

#endif /* _UAPI_LINUX_VIRTIO_SCMI_H */
firmware: arm_scmi: Add virtio transport This transport enables communications with an SCMI platform through virtio; the SCMI platform will be represented by a virtio device. Implement an SCMI virtio driver according to the virtio SCMI device spec [1]. Virtio device id 32 has been reserved for the SCMI device [2]. The virtio transport has one Tx channel (virtio cmdq, A2P channel) and at most one Rx channel (virtio eventq, P2A channel). The following feature bit defined in [1] is not implemented: VIRTIO_SCMI_F_SHARED_MEMORY. The number of messages which can be pending simultaneously is restricted according to the virtqueue capacity negotiated at probing time. As soon as Rx channel message buffers are allocated or have been read out by the arm-scmi driver, feed them back to the virtio device. Since some virtio devices may not have the short response time exhibited by SCMI platforms using other transports, set a generous response timeout. SCMI polling mode is not supported by this virtio transport since deemed meaningless: polling mode operation is offered by the SCMI core to those transports that could not provide a completion interrupt on the TX path, which is never the case for virtio whose core callbacks can easily call into core scmi_rx_callback upon messages reception. [1] https://github.com/oasis-tcs/virtio-spec/blob/master/virtio-scmi.tex [2] https://www.oasis-open.org/committees/ballot.php?id=3496 Link: https://lore.kernel.org/r/20210803131024.40280-16-cristian.marussi@arm.com Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Co-developed-by: Peter Hilber <peter.hilber@opensynergy.com> Co-developed-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Igor Skalkin <igor.skalkin@opensynergy.com> [ Peter: Adapted patch for submission to upstream. ] Signed-off-by: Peter Hilber <peter.hilber@opensynergy.com> [ Cristian: simplified driver logic, changed link_supplier and channel available/setup logic, removed dummy callbacks ] Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> 2021-08-03 16:10:24 +03:00			`/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */`
			`/*`
			`* Copyright (C) 2020-2021 OpenSynergy GmbH`
			`* Copyright (C) 2021 ARM Ltd.`
			`*/`

			`#ifndef _UAPI_LINUX_VIRTIO_SCMI_H`
			`#define _UAPI_LINUX_VIRTIO_SCMI_H`

			`#include <linux/virtio_types.h>`

			`/* Device implements some SCMI notifications, or delayed responses. */`
			`#define VIRTIO_SCMI_F_P2A_CHANNELS 0`

			`/* Device implements any SCMI statistics shared memory region */`
			`#define VIRTIO_SCMI_F_SHARED_MEMORY 1`

			`/* Virtqueues */`

			`#define VIRTIO_SCMI_VQ_TX 0 /* cmdq */`
			`#define VIRTIO_SCMI_VQ_RX 1 /* eventq */`
			`#define VIRTIO_SCMI_VQ_MAX_CNT 2`

			`#endif /* _UAPI_LINUX_VIRTIO_SCMI_H */`