// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2015 - 2021 Intel Corporation */
#include "adf_accel_devices.h"
#include "adf_common_drv.h"
#include "adf_pfvf_msg.h"
#include "adf_pfvf_vf_msg.h"
#include "adf_pfvf_vf_proto.h"

/**
 * adf_vf2pf_notify_init() - send init msg to PF
 * @accel_dev:  Pointer to acceleration VF device.
 *
 * Function sends an init message from the VF to a PF
 *
 * Return: 0 on success, error code otherwise.
 */
int adf_vf2pf_notify_init(struct adf_accel_dev *accel_dev)
{
	struct pfvf_message msg = { .type = ADF_VF2PF_MSGTYPE_INIT };

	if (adf_send_vf2pf_msg(accel_dev, msg)) {
		dev_err(&GET_DEV(accel_dev),
			"Failed to send Init event to PF\n");
		return -EFAULT;
	}
	set_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status);
	return 0;
}
EXPORT_SYMBOL_GPL(adf_vf2pf_notify_init);

/**
 * adf_vf2pf_notify_shutdown() - send shutdown msg to PF
 * @accel_dev:  Pointer to acceleration VF device.
 *
 * Function sends a shutdown message from the VF to a PF
 *
 * Return: void
 */
void adf_vf2pf_notify_shutdown(struct adf_accel_dev *accel_dev)
{
	struct pfvf_message msg = { .type = ADF_VF2PF_MSGTYPE_SHUTDOWN };

	if (test_bit(ADF_STATUS_PF_RUNNING, &accel_dev->status))
		if (adf_send_vf2pf_msg(accel_dev, msg))
			dev_err(&GET_DEV(accel_dev),
				"Failed to send Shutdown event to PF\n");
}
EXPORT_SYMBOL_GPL(adf_vf2pf_notify_shutdown);

int adf_vf2pf_request_version(struct adf_accel_dev *accel_dev)
{
	u8 pf_version;
	int compat;
	int ret;
	struct pfvf_message resp;
	struct pfvf_message msg = {
		.type = ADF_VF2PF_MSGTYPE_COMPAT_VER_REQ,
		.data = ADF_PFVF_COMPAT_THIS_VERSION,
	};

	BUILD_BUG_ON(ADF_PFVF_COMPAT_THIS_VERSION > 255);

	ret = adf_send_vf2pf_req(accel_dev, msg, &resp);
	if (ret) {
		dev_err(&GET_DEV(accel_dev),
			"Failed to send Compatibility Version Request.\n");
		return ret;
	}

	pf_version = (resp.data >> ADF_PF2VF_VERSION_RESP_VERS_SHIFT)
		     & ADF_PF2VF_VERSION_RESP_VERS_MASK;
	compat = (resp.data >> ADF_PF2VF_VERSION_RESP_RESULT_SHIFT)
		 & ADF_PF2VF_VERSION_RESP_RESULT_MASK;

	/* Response from PF received, check compatibility */
	switch (compat) {
	case ADF_PF2VF_VF_COMPATIBLE:
		break;
	case ADF_PF2VF_VF_COMPAT_UNKNOWN:
		/* VF is newer than PF - compatible for now */
		break;
	case ADF_PF2VF_VF_INCOMPATIBLE:
		dev_err(&GET_DEV(accel_dev),
			"PF (vers %d) and VF (vers %d) are not compatible\n",
			pf_version, ADF_PFVF_COMPAT_THIS_VERSION);
		return -EINVAL;
	default:
		dev_err(&GET_DEV(accel_dev),
			"Invalid response from PF; assume not compatible\n");
		return -EINVAL;
	}

	accel_dev->vf.pf_version = pf_version;
	return 0;
}