Revision d1bc75d7595b237f78b594509ea7cc159f98cae9 authored by WANG Xuerui on 26 July 2022, 15:57:20 UTC, committed by Huacai Chen on 29 July 2022, 10:22:32 UTC
Support for the syntactic sugar is present in upstream binutils port from the beginning. Use it for shorter lines and better consistency. Generated code should be identical. Signed-off-by: WANG Xuerui <git@xen0n.name> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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adf_pfvf_vf_proto.c
// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2015 - 2021 Intel Corporation */
#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/minmax.h>
#include <linux/types.h>
#include "adf_accel_devices.h"
#include "adf_common_drv.h"
#include "adf_pfvf_msg.h"
#include "adf_pfvf_utils.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
/* How often to retry if there is no response */
#define ADF_PFVF_MSG_RESP_RETRIES 5
#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, struct pfvf_message msg)
{
struct adf_pfvf_ops *pfvf_ops = GET_PFVF_OPS(accel_dev);
u32 pfvf_offset = pfvf_ops->get_vf2pf_offset(0);
return pfvf_ops->send_msg(accel_dev, msg, pfvf_offset,
&accel_dev->vf.vf2pf_lock);
}
/**
* 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 struct pfvf_message adf_recv_pf2vf_msg(struct adf_accel_dev *accel_dev)
{
struct adf_pfvf_ops *pfvf_ops = GET_PFVF_OPS(accel_dev);
u32 pfvf_offset = pfvf_ops->get_pf2vf_offset(0);
return pfvf_ops->recv_msg(accel_dev, pfvf_offset, accel_dev->vf.pf_compat_ver);
}
/**
* 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, struct pfvf_message msg,
struct pfvf_message *resp)
{
unsigned long timeout = msecs_to_jiffies(ADF_PFVF_MSG_RESP_TIMEOUT);
unsigned int retries = ADF_PFVF_MSG_RESP_RETRIES;
int ret;
reinit_completion(&accel_dev->vf.msg_received);
/* Send request from VF to PF */
do {
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 it times out retry */
ret = wait_for_completion_timeout(&accel_dev->vf.msg_received,
timeout);
if (ret) {
if (likely(resp))
*resp = accel_dev->vf.response;
/* Once copied, set to an invalid value */
accel_dev->vf.response.type = 0;
return 0;
}
dev_err(&GET_DEV(accel_dev), "PFVF response message timeout\n");
} while (--retries);
return -EIO;
}
static int adf_vf2pf_blkmsg_data_req(struct adf_accel_dev *accel_dev, bool crc,
u8 *type, u8 *data)
{
struct pfvf_message req = { 0 };
struct pfvf_message resp = { 0 };
u8 blk_type;
u8 blk_byte;
u8 msg_type;
u8 max_data;
int err;
/* Convert the block type to {small, medium, large} size category */
if (*type <= ADF_VF2PF_SMALL_BLOCK_TYPE_MAX) {
msg_type = ADF_VF2PF_MSGTYPE_SMALL_BLOCK_REQ;
blk_type = FIELD_PREP(ADF_VF2PF_SMALL_BLOCK_TYPE_MASK, *type);
blk_byte = FIELD_PREP(ADF_VF2PF_SMALL_BLOCK_BYTE_MASK, *data);
max_data = ADF_VF2PF_SMALL_BLOCK_BYTE_MAX;
} else if (*type <= ADF_VF2PF_MEDIUM_BLOCK_TYPE_MAX) {
msg_type = ADF_VF2PF_MSGTYPE_MEDIUM_BLOCK_REQ;
blk_type = FIELD_PREP(ADF_VF2PF_MEDIUM_BLOCK_TYPE_MASK,
*type - ADF_VF2PF_SMALL_BLOCK_TYPE_MAX);
blk_byte = FIELD_PREP(ADF_VF2PF_MEDIUM_BLOCK_BYTE_MASK, *data);
max_data = ADF_VF2PF_MEDIUM_BLOCK_BYTE_MAX;
} else if (*type <= ADF_VF2PF_LARGE_BLOCK_TYPE_MAX) {
msg_type = ADF_VF2PF_MSGTYPE_LARGE_BLOCK_REQ;
blk_type = FIELD_PREP(ADF_VF2PF_LARGE_BLOCK_TYPE_MASK,
*type - ADF_VF2PF_MEDIUM_BLOCK_TYPE_MAX);
blk_byte = FIELD_PREP(ADF_VF2PF_LARGE_BLOCK_BYTE_MASK, *data);
max_data = ADF_VF2PF_LARGE_BLOCK_BYTE_MAX;
} else {
dev_err(&GET_DEV(accel_dev), "Invalid message type %u\n", *type);
return -EINVAL;
}
/* Sanity check */
if (*data > max_data) {
dev_err(&GET_DEV(accel_dev),
"Invalid byte %s %u for message type %u\n",
crc ? "count" : "index", *data, *type);
return -EINVAL;
}
/* Build the block message */
req.type = msg_type;
req.data = blk_type | blk_byte | FIELD_PREP(ADF_VF2PF_BLOCK_CRC_REQ_MASK, crc);
err = adf_send_vf2pf_req(accel_dev, req, &resp);
if (err)
return err;
*type = FIELD_GET(ADF_PF2VF_BLKMSG_RESP_TYPE_MASK, resp.data);
*data = FIELD_GET(ADF_PF2VF_BLKMSG_RESP_DATA_MASK, resp.data);
return 0;
}
static int adf_vf2pf_blkmsg_get_byte(struct adf_accel_dev *accel_dev, u8 type,
u8 index, u8 *data)
{
int ret;
ret = adf_vf2pf_blkmsg_data_req(accel_dev, false, &type, &index);
if (ret < 0)
return ret;
if (unlikely(type != ADF_PF2VF_BLKMSG_RESP_TYPE_DATA)) {
dev_err(&GET_DEV(accel_dev),
"Unexpected BLKMSG response type %u, byte 0x%x\n",
type, index);
return -EFAULT;
}
*data = index;
return 0;
}
static int adf_vf2pf_blkmsg_get_crc(struct adf_accel_dev *accel_dev, u8 type,
u8 bytes, u8 *crc)
{
int ret;
/* The count of bytes refers to a length, however shift it to a 0-based
* count to avoid overflows. Thus, a request for 0 bytes is technically
* valid.
*/
--bytes;
ret = adf_vf2pf_blkmsg_data_req(accel_dev, true, &type, &bytes);
if (ret < 0)
return ret;
if (unlikely(type != ADF_PF2VF_BLKMSG_RESP_TYPE_CRC)) {
dev_err(&GET_DEV(accel_dev),
"Unexpected CRC BLKMSG response type %u, crc 0x%x\n",
type, bytes);
return -EFAULT;
}
*crc = bytes;
return 0;
}
/**
* adf_send_vf2pf_blkmsg_req() - retrieve block message
* @accel_dev: Pointer to acceleration VF device.
* @type: The block message type, see adf_pfvf_msg.h for allowed values
* @buffer: input buffer where to place the received data
* @buffer_len: buffer length as input, the amount of written bytes on output
*
* Request a message of type 'type' over the block message transport.
* This function will send the required amount block message requests and
* return the overall content back to the caller through the provided buffer.
* The buffer should be large enough to contain the requested message type,
* otherwise the response will be truncated.
*
* Return: 0 on success, error code otherwise.
*/
int adf_send_vf2pf_blkmsg_req(struct adf_accel_dev *accel_dev, u8 type,
u8 *buffer, unsigned int *buffer_len)
{
unsigned int index;
unsigned int msg_len;
int ret;
u8 remote_crc;
u8 local_crc;
if (unlikely(type > ADF_VF2PF_LARGE_BLOCK_TYPE_MAX)) {
dev_err(&GET_DEV(accel_dev), "Invalid block message type %d\n",
type);
return -EINVAL;
}
if (unlikely(*buffer_len < ADF_PFVF_BLKMSG_HEADER_SIZE)) {
dev_err(&GET_DEV(accel_dev),
"Buffer size too small for a block message\n");
return -EINVAL;
}
ret = adf_vf2pf_blkmsg_get_byte(accel_dev, type,
ADF_PFVF_BLKMSG_VER_BYTE,
&buffer[ADF_PFVF_BLKMSG_VER_BYTE]);
if (unlikely(ret))
return ret;
if (unlikely(!buffer[ADF_PFVF_BLKMSG_VER_BYTE])) {
dev_err(&GET_DEV(accel_dev),
"Invalid version 0 received for block request %u", type);
return -EFAULT;
}
ret = adf_vf2pf_blkmsg_get_byte(accel_dev, type,
ADF_PFVF_BLKMSG_LEN_BYTE,
&buffer[ADF_PFVF_BLKMSG_LEN_BYTE]);
if (unlikely(ret))
return ret;
if (unlikely(!buffer[ADF_PFVF_BLKMSG_LEN_BYTE])) {
dev_err(&GET_DEV(accel_dev),
"Invalid size 0 received for block request %u", type);
return -EFAULT;
}
/* We need to pick the minimum since there is no way to request a
* specific version. As a consequence any scenario is possible:
* - PF has a newer (longer) version which doesn't fit in the buffer
* - VF expects a newer (longer) version, so we must not ask for
* bytes in excess
* - PF and VF share the same version, no problem
*/
msg_len = ADF_PFVF_BLKMSG_HEADER_SIZE + buffer[ADF_PFVF_BLKMSG_LEN_BYTE];
msg_len = min(*buffer_len, msg_len);
/* Get the payload */
for (index = ADF_PFVF_BLKMSG_HEADER_SIZE; index < msg_len; index++) {
ret = adf_vf2pf_blkmsg_get_byte(accel_dev, type, index,
&buffer[index]);
if (unlikely(ret))
return ret;
}
ret = adf_vf2pf_blkmsg_get_crc(accel_dev, type, msg_len, &remote_crc);
if (unlikely(ret))
return ret;
local_crc = adf_pfvf_calc_blkmsg_crc(buffer, msg_len);
if (unlikely(local_crc != remote_crc)) {
dev_err(&GET_DEV(accel_dev),
"CRC error on msg type %d. Local %02X, remote %02X\n",
type, local_crc, remote_crc);
return -EIO;
}
*buffer_len = msg_len;
return 0;
}
static bool adf_handle_pf2vf_msg(struct adf_accel_dev *accel_dev,
struct pfvf_message msg)
{
switch (msg.type) {
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:
case ADF_PF2VF_MSGTYPE_BLKMSG_RESP:
case ADF_PF2VF_MSGTYPE_RP_RESET_RESP:
dev_dbg(&GET_DEV(accel_dev),
"Response Message received from PF (type 0x%.4x, data 0x%.4x)\n",
msg.type, msg.data);
accel_dev->vf.response = msg;
complete(&accel_dev->vf.msg_received);
return true;
default:
dev_err(&GET_DEV(accel_dev),
"Unknown message from PF (type 0x%.4x, data: 0x%.4x)\n",
msg.type, msg.data);
}
return false;
}
bool adf_recv_and_handle_pf2vf_msg(struct adf_accel_dev *accel_dev)
{
struct pfvf_message msg;
msg = adf_recv_pf2vf_msg(accel_dev);
if (msg.type) /* Invalid or no message */
return adf_handle_pf2vf_msg(accel_dev, msg);
/* No replies for PF->VF messages at present */
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)
{
int ret;
adf_pfvf_crc_init();
adf_enable_pf2vf_interrupts(accel_dev);
ret = adf_vf2pf_request_version(accel_dev);
if (ret)
return ret;
ret = adf_vf2pf_get_capabilities(accel_dev);
if (ret)
return ret;
ret = adf_vf2pf_get_ring_to_svc(accel_dev);
return ret;
}
EXPORT_SYMBOL_GPL(adf_enable_vf2pf_comms);
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