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// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2015 - 2021 Intel Corporation */
#include <linux/completion.h>
#include <linux/types.h>
#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"
#define ADF_PFVF_MSG_COLLISION_DETECT_DELAY 10
#define ADF_PFVF_MSG_ACK_DELAY 2
#define ADF_PFVF_MSG_ACK_MAX_RETRY 100
#define ADF_PFVF_MSG_RESP_TIMEOUT (ADF_PFVF_MSG_ACK_DELAY * \
ADF_PFVF_MSG_ACK_MAX_RETRY + \
ADF_PFVF_MSG_COLLISION_DETECT_DELAY)
/**
* adf_send_vf2pf_msg() - send VF to PF message
* @accel_dev: Pointer to acceleration device
* @msg: Message to send
*
* This function allows the VF to send a message to the PF.
*
* Return: 0 on success, error code otherwise.
*/
int adf_send_vf2pf_msg(struct adf_accel_dev *accel_dev, u32 msg)
{
return GET_PFVF_OPS(accel_dev)->send_msg(accel_dev, msg, 0);
}
/**
* adf_recv_pf2vf_msg() - receive a PF to VF message
* @accel_dev: Pointer to acceleration device
*
* This function allows the VF to receive a message from the PF.
*
* Return: a valid message on success, zero otherwise.
*/
static u32 adf_recv_pf2vf_msg(struct adf_accel_dev *accel_dev)
{
return GET_PFVF_OPS(accel_dev)->recv_msg(accel_dev, 0);
}
/**
* adf_send_vf2pf_req() - send VF2PF request message
* @accel_dev: Pointer to acceleration device.
* @msg: Request message to send
* @resp: Returned PF response
*
* This function sends a message that requires a response from the VF to the PF
* and waits for a reply.
*
* Return: 0 on success, error code otherwise.
*/
int adf_send_vf2pf_req(struct adf_accel_dev *accel_dev, u32 msg, u32 *resp)
{
unsigned long timeout = msecs_to_jiffies(ADF_PFVF_MSG_RESP_TIMEOUT);
int ret;
reinit_completion(&accel_dev->vf.msg_received);
/* Send request from VF to PF */
ret = adf_send_vf2pf_msg(accel_dev, msg);
if (ret) {
dev_err(&GET_DEV(accel_dev),
"Failed to send request msg to PF\n");
return ret;
}
/* Wait for response */
if (!wait_for_completion_timeout(&accel_dev->vf.msg_received,
timeout)) {
dev_err(&GET_DEV(accel_dev),
"PFVF request/response message timeout expired\n");
return -EIO;
}
if (likely(resp))
*resp = accel_dev->vf.response;
/* Once copied, set to an invalid value */
accel_dev->vf.response = 0;
return 0;
}
static bool adf_handle_pf2vf_msg(struct adf_accel_dev *accel_dev, u32 msg)
{
switch ((msg >> ADF_PFVF_MSGTYPE_SHIFT) & ADF_PFVF_MSGTYPE_MASK) {
case ADF_PF2VF_MSGTYPE_RESTARTING:
dev_dbg(&GET_DEV(accel_dev), "Restarting message received from PF\n");
adf_pf2vf_handle_pf_restarting(accel_dev);
return false;
case ADF_PF2VF_MSGTYPE_VERSION_RESP:
dev_dbg(&GET_DEV(accel_dev),
"Response message received from PF (0x%.8x)\n", msg);
accel_dev->vf.response = msg;
complete(&accel_dev->vf.msg_received);
return true;
default:
dev_err(&GET_DEV(accel_dev),
"Unknown PF2VF message (0x%.8x) from PF\n", msg);
}
return false;
}
bool adf_recv_and_handle_pf2vf_msg(struct adf_accel_dev *accel_dev)
{
u32 msg;
msg = adf_recv_pf2vf_msg(accel_dev);
if (msg)
return adf_handle_pf2vf_msg(accel_dev, msg);
return true;
}
/**
* adf_enable_vf2pf_comms() - Function enables communication from vf to pf
*
* @accel_dev: Pointer to acceleration device virtual function.
*
* Return: 0 on success, error code otherwise.
*/
int adf_enable_vf2pf_comms(struct adf_accel_dev *accel_dev)
{
adf_enable_pf2vf_interrupts(accel_dev);
return adf_vf2pf_request_version(accel_dev);
}
EXPORT_SYMBOL_GPL(adf_enable_vf2pf_comms);
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