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// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2015 - 2020 Intel Corporation */
#include "adf_accel_devices.h"
#include "adf_common_drv.h"
#include "adf_pf2vf_msg.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_pf2vf_msg() - send PF to VF message
* @accel_dev: Pointer to acceleration device
* @vf_nr: VF number to which the message will be sent
* @msg: Message to send
*
* This function allows the PF to send a message to a specific VF.
*
* Return: 0 on success, error code otherwise.
*/
static int adf_send_pf2vf_msg(struct adf_accel_dev *accel_dev, u8 vf_nr, u32 msg)
{
return GET_PFVF_OPS(accel_dev)->send_msg(accel_dev, msg, vf_nr);
}
/**
* 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_send_vf2pf_req() - send VF2PF request message
* @accel_dev: Pointer to acceleration device.
* @msg: Request message to send
*
* 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.
*/
static int adf_send_vf2pf_req(struct adf_accel_dev *accel_dev, u32 msg)
{
unsigned long timeout = msecs_to_jiffies(ADF_PFVF_MSG_RESP_TIMEOUT);
int ret;
reinit_completion(&accel_dev->vf.iov_msg_completion);
/* 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.iov_msg_completion,
timeout)) {
dev_err(&GET_DEV(accel_dev),
"PFVF request/response message timeout expired\n");
return -EIO;
}
return 0;
}
static int adf_handle_vf2pf_msg(struct adf_accel_dev *accel_dev, u32 vf_nr,
u32 msg, u32 *response)
{
struct adf_accel_vf_info *vf_info = &accel_dev->pf.vf_info[vf_nr];
struct adf_hw_device_data *hw_data = accel_dev->hw_device;
u32 resp = 0;
switch ((msg & ADF_VF2PF_MSGTYPE_MASK) >> ADF_VF2PF_MSGTYPE_SHIFT) {
case ADF_VF2PF_MSGTYPE_COMPAT_VER_REQ:
{
u8 vf_compat_ver = msg >> ADF_VF2PF_COMPAT_VER_REQ_SHIFT;
resp = (ADF_PF2VF_MSGORIGIN_SYSTEM |
(ADF_PF2VF_MSGTYPE_VERSION_RESP <<
ADF_PF2VF_MSGTYPE_SHIFT) |
(ADF_PFVF_COMPAT_THIS_VERSION <<
ADF_PF2VF_VERSION_RESP_VERS_SHIFT));
dev_dbg(&GET_DEV(accel_dev),
"Compatibility Version Request from VF%d vers=%u\n",
vf_nr + 1, vf_compat_ver);
if (vf_compat_ver < hw_data->min_iov_compat_ver) {
dev_err(&GET_DEV(accel_dev),
"VF (vers %d) incompatible with PF (vers %d)\n",
vf_compat_ver, ADF_PFVF_COMPAT_THIS_VERSION);
resp |= ADF_PF2VF_VF_INCOMPATIBLE <<
ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
} else if (vf_compat_ver > ADF_PFVF_COMPAT_THIS_VERSION) {
dev_err(&GET_DEV(accel_dev),
"VF (vers %d) compat with PF (vers %d) unkn.\n",
vf_compat_ver, ADF_PFVF_COMPAT_THIS_VERSION);
resp |= ADF_PF2VF_VF_COMPAT_UNKNOWN <<
ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
} else {
dev_dbg(&GET_DEV(accel_dev),
"VF (vers %d) compatible with PF (vers %d)\n",
vf_compat_ver, ADF_PFVF_COMPAT_THIS_VERSION);
resp |= ADF_PF2VF_VF_COMPATIBLE <<
ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
}
}
break;
case ADF_VF2PF_MSGTYPE_VERSION_REQ:
dev_dbg(&GET_DEV(accel_dev),
"Legacy VersionRequest received from VF%d 0x%x\n",
vf_nr + 1, msg);
resp = (ADF_PF2VF_MSGORIGIN_SYSTEM |
(ADF_PF2VF_MSGTYPE_VERSION_RESP <<
ADF_PF2VF_MSGTYPE_SHIFT) |
(ADF_PFVF_COMPAT_THIS_VERSION <<
ADF_PF2VF_VERSION_RESP_VERS_SHIFT));
resp |= ADF_PF2VF_VF_COMPATIBLE <<
ADF_PF2VF_VERSION_RESP_RESULT_SHIFT;
/* Set legacy major and minor version num */
resp |= 1 << ADF_PF2VF_MAJORVERSION_SHIFT |
1 << ADF_PF2VF_MINORVERSION_SHIFT;
break;
case ADF_VF2PF_MSGTYPE_INIT:
{
dev_dbg(&GET_DEV(accel_dev),
"Init message received from VF%d 0x%x\n",
vf_nr + 1, msg);
vf_info->init = true;
}
break;
case ADF_VF2PF_MSGTYPE_SHUTDOWN:
{
dev_dbg(&GET_DEV(accel_dev),
"Shutdown message received from VF%d 0x%x\n",
vf_nr + 1, msg);
vf_info->init = false;
}
break;
default:
dev_dbg(&GET_DEV(accel_dev), "Unknown message from VF%d (0x%x)\n",
vf_nr + 1, msg);
return -ENOMSG;
}
*response = resp;
return 0;
}
bool adf_recv_and_handle_vf2pf_msg(struct adf_accel_dev *accel_dev, u32 vf_nr)
{
struct adf_hw_device_data *hw_data = accel_dev->hw_device;
int bar_id = hw_data->get_misc_bar_id(hw_data);
struct adf_bar *pmisc = &GET_BARS(accel_dev)[bar_id];
void __iomem *pmisc_addr = pmisc->virt_addr;
u32 msg, resp = 0;
/* Read message from the VF */
msg = ADF_CSR_RD(pmisc_addr, hw_data->pfvf_ops.get_vf2pf_offset(vf_nr));
if (!(msg & ADF_VF2PF_INT)) {
dev_info(&GET_DEV(accel_dev),
"Spurious VF2PF interrupt, msg %X. Ignored\n", msg);
return true;
}
/* Ignore legacy non-system (non-kernel) VF2PF messages */
if (!(msg & ADF_VF2PF_MSGORIGIN_SYSTEM)) {
dev_dbg(&GET_DEV(accel_dev),
"Ignored non-system message from VF%d (0x%x);\n",
vf_nr + 1, msg);
return true;
}
/* To ACK, clear the VF2PFINT bit */
msg &= ~ADF_VF2PF_INT;
ADF_CSR_WR(pmisc_addr, hw_data->pfvf_ops.get_vf2pf_offset(vf_nr), msg);
if (adf_handle_vf2pf_msg(accel_dev, vf_nr, msg, &resp))
return false;
if (resp && adf_send_pf2vf_msg(accel_dev, vf_nr, resp))
dev_err(&GET_DEV(accel_dev), "Failed to send response to VF\n");
return true;
}
void adf_pf2vf_notify_restarting(struct adf_accel_dev *accel_dev)
{
struct adf_accel_vf_info *vf;
u32 msg = (ADF_PF2VF_MSGORIGIN_SYSTEM |
(ADF_PF2VF_MSGTYPE_RESTARTING << ADF_PF2VF_MSGTYPE_SHIFT));
int i, num_vfs = pci_num_vf(accel_to_pci_dev(accel_dev));
for (i = 0, vf = accel_dev->pf.vf_info; i < num_vfs; i++, vf++) {
if (vf->init && adf_send_pf2vf_msg(accel_dev, i, msg))
dev_err(&GET_DEV(accel_dev),
"Failed to send restarting msg to VF%d\n", i);
}
}
static int adf_vf2pf_request_version(struct adf_accel_dev *accel_dev)
{
struct adf_hw_device_data *hw_data = accel_dev->hw_device;
u32 msg = 0;
int ret;
msg = ADF_VF2PF_MSGORIGIN_SYSTEM;
msg |= ADF_VF2PF_MSGTYPE_COMPAT_VER_REQ << ADF_VF2PF_MSGTYPE_SHIFT;
msg |= ADF_PFVF_COMPAT_THIS_VERSION << ADF_VF2PF_COMPAT_VER_REQ_SHIFT;
BUILD_BUG_ON(ADF_PFVF_COMPAT_THIS_VERSION > 255);
ret = adf_send_vf2pf_req(accel_dev, msg);
if (ret) {
dev_err(&GET_DEV(accel_dev),
"Failed to send Compatibility Version Request.\n");
return ret;
}
/* Response from PF received, check compatibility */
switch (accel_dev->vf.compatible) {
case ADF_PF2VF_VF_COMPATIBLE:
break;
case ADF_PF2VF_VF_COMPAT_UNKNOWN:
/* VF is newer than PF and decides whether it is compatible */
if (accel_dev->vf.pf_version >= hw_data->min_iov_compat_ver) {
accel_dev->vf.compatible = ADF_PF2VF_VF_COMPATIBLE;
break;
}
fallthrough;
case ADF_PF2VF_VF_INCOMPATIBLE:
dev_err(&GET_DEV(accel_dev),
"PF (vers %d) and VF (vers %d) are not compatible\n",
accel_dev->vf.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;
}
return ret;
}
/**
* 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);
/**
* adf_enable_pf2vf_comms() - Function enables communication from pf to vf
*
* @accel_dev: Pointer to acceleration device virtual function.
*
* This function carries out the necessary steps to setup and start the PFVF
* communication channel, if any.
*
* Return: 0 on success, error code otherwise.
*/
int adf_enable_pf2vf_comms(struct adf_accel_dev *accel_dev)
{
spin_lock_init(&accel_dev->pf.vf2pf_ints_lock);
return 0;
}
EXPORT_SYMBOL_GPL(adf_enable_pf2vf_comms);
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