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// SPDX-License-Identifier: GPL-2.0+
// Copyright (c) 2016-2017 Hisilicon Limited.
#include "hclge_mbx.h"
#include "hclgevf_main.h"
#include "hnae3.h"
static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev)
{
/* this function should be called with mbx_resp.mbx_mutex held
* to prtect the received_response from race condition
*/
hdev->mbx_resp.received_resp = false;
hdev->mbx_resp.origin_mbx_msg = 0;
hdev->mbx_resp.resp_status = 0;
memset(hdev->mbx_resp.additional_info, 0, HCLGE_MBX_MAX_RESP_DATA_SIZE);
}
/* hclgevf_get_mbx_resp: used to get a response from PF after VF sends a mailbox
* message to PF.
* @hdev: pointer to struct hclgevf_dev
* @resp_msg: pointer to store the original message type and response status
* @len: the resp_msg data array length.
*/
static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
u8 *resp_data, u16 resp_len)
{
#define HCLGEVF_MAX_TRY_TIMES 500
#define HCLGEVF_SLEEP_USCOEND 1000
struct hclgevf_mbx_resp_status *mbx_resp;
u16 r_code0, r_code1;
int i = 0;
if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) {
dev_err(&hdev->pdev->dev,
"VF mbx response len(=%d) exceeds maximum(=%d)\n",
resp_len,
HCLGE_MBX_MAX_RESP_DATA_SIZE);
return -EINVAL;
}
while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) {
udelay(HCLGEVF_SLEEP_USCOEND);
i++;
}
if (i >= HCLGEVF_MAX_TRY_TIMES) {
dev_err(&hdev->pdev->dev,
"VF could not get mbx resp(=%d) from PF in %d tries\n",
hdev->mbx_resp.received_resp, i);
return -EIO;
}
mbx_resp = &hdev->mbx_resp;
r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);
if (mbx_resp->resp_status)
return mbx_resp->resp_status;
if (resp_data)
memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
hclgevf_reset_mbx_resp_status(hdev);
if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
dev_err(&hdev->pdev->dev,
"VF could not match resp code(code0=%d,code1=%d), %d",
code0, code1, mbx_resp->resp_status);
return -EIO;
}
return 0;
}
int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode,
const u8 *msg_data, u8 msg_len, bool need_resp,
u8 *resp_data, u16 resp_len)
{
struct hclge_mbx_vf_to_pf_cmd *req;
struct hclgevf_desc desc;
int status;
req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
/* first two bytes are reserved for code & subcode */
if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) {
dev_err(&hdev->pdev->dev,
"VF send mbx msg fail, msg len %d exceeds max len %d\n",
msg_len, HCLGE_MBX_MAX_MSG_SIZE);
return -EINVAL;
}
hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
req->msg[0] = code;
req->msg[1] = subcode;
memcpy(&req->msg[2], msg_data, msg_len);
/* synchronous send */
if (need_resp) {
mutex_lock(&hdev->mbx_resp.mbx_mutex);
hclgevf_reset_mbx_resp_status(hdev);
status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
if (status) {
dev_err(&hdev->pdev->dev,
"VF failed(=%d) to send mbx message to PF\n",
status);
mutex_unlock(&hdev->mbx_resp.mbx_mutex);
return status;
}
status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data,
resp_len);
mutex_unlock(&hdev->mbx_resp.mbx_mutex);
} else {
/* asynchronous send */
status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
if (status) {
dev_err(&hdev->pdev->dev,
"VF failed(=%d) to send mbx message to PF\n",
status);
return status;
}
}
return status;
}
void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
{
struct hclgevf_mbx_resp_status *resp;
struct hclge_mbx_pf_to_vf_cmd *req;
struct hclgevf_cmq_ring *crq;
struct hclgevf_desc *desc;
u16 *msg_q;
u16 flag;
u8 *temp;
int i;
resp = &hdev->mbx_resp;
crq = &hdev->hw.cmq.crq;
flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
while (hnae_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B)) {
desc = &crq->desc[crq->next_to_use];
req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
/* synchronous messages are time critical and need preferential
* treatment. Therefore, we need to acknowledge all the sync
* responses as quickly as possible so that waiting tasks do not
* timeout and simultaneously queue the async messages for later
* prcessing in context of mailbox task i.e. the slow path.
*/
switch (req->msg[0]) {
case HCLGE_MBX_PF_VF_RESP:
if (resp->received_resp)
dev_warn(&hdev->pdev->dev,
"VF mbx resp flag not clear(%d)\n",
req->msg[1]);
resp->received_resp = true;
resp->origin_mbx_msg = (req->msg[1] << 16);
resp->origin_mbx_msg |= req->msg[2];
resp->resp_status = req->msg[3];
temp = (u8 *)&req->msg[4];
for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
resp->additional_info[i] = *temp;
temp++;
}
break;
case HCLGE_MBX_LINK_STAT_CHANGE:
case HCLGE_MBX_ASSERTING_RESET:
/* set this mbx event as pending. This is required as we
* might loose interrupt event when mbx task is busy
* handling. This shall be cleared when mbx task just
* enters handling state.
*/
hdev->mbx_event_pending = true;
/* we will drop the async msg if we find ARQ as full
* and continue with next message
*/
if (hdev->arq.count >= HCLGE_MBX_MAX_ARQ_MSG_NUM) {
dev_warn(&hdev->pdev->dev,
"Async Q full, dropping msg(%d)\n",
req->msg[1]);
break;
}
/* tail the async message in arq */
msg_q = hdev->arq.msg_q[hdev->arq.tail];
memcpy(&msg_q[0], req->msg, HCLGE_MBX_MAX_ARQ_MSG_SIZE);
hclge_mbx_tail_ptr_move_arq(hdev->arq);
hdev->arq.count++;
hclgevf_mbx_task_schedule(hdev);
break;
default:
dev_err(&hdev->pdev->dev,
"VF received unsupported(%d) mbx msg from PF\n",
req->msg[0]);
break;
}
crq->desc[crq->next_to_use].flag = 0;
hclge_mbx_ring_ptr_move_crq(crq);
flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
}
/* Write back CMDQ_RQ header pointer, M7 need this pointer */
hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
crq->next_to_use);
}
void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
{
u16 link_status;
u16 *msg_q;
u8 duplex;
u32 speed;
u32 tail;
/* we can safely clear it now as we are at start of the async message
* processing
*/
hdev->mbx_event_pending = false;
tail = hdev->arq.tail;
/* process all the async queue messages */
while (tail != hdev->arq.head) {
msg_q = hdev->arq.msg_q[hdev->arq.head];
switch (msg_q[0]) {
case HCLGE_MBX_LINK_STAT_CHANGE:
link_status = le16_to_cpu(msg_q[1]);
memcpy(&speed, &msg_q[2], sizeof(speed));
duplex = (u8)le16_to_cpu(msg_q[4]);
/* update upper layer with new link link status */
hclgevf_update_link_status(hdev, link_status);
hclgevf_update_speed_duplex(hdev, speed, duplex);
break;
case HCLGE_MBX_ASSERTING_RESET:
/* PF has asserted reset hence VF should go in pending
* state and poll for the hardware reset status till it
* has been completely reset. After this stack should
* eventually be re-initialized.
*/
hdev->nic.reset_level = HNAE3_VF_RESET;
set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
hclgevf_reset_task_schedule(hdev);
break;
default:
dev_err(&hdev->pdev->dev,
"fetched unsupported(%d) message from arq\n",
msg_q[0]);
break;
}
hclge_mbx_head_ptr_move_arq(hdev->arq);
hdev->arq.count--;
msg_q = hdev->arq.msg_q[hdev->arq.head];
}
}
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