/*
* Copyright (c) 2016~2017 Hisilicon Limited.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/dma-direction.h>
#include "hclge_cmd.h"
#include "hnae3.h"
#include "hclge_main.h"
#define hclge_is_csq(ring) ((ring)->flag & HCLGE_TYPE_CSQ)
#define hclge_ring_to_dma_dir(ring) (hclge_is_csq(ring) ? \
DMA_TO_DEVICE : DMA_FROM_DEVICE)
#define cmq_ring_to_dev(ring) (&(ring)->dev->pdev->dev)
static int hclge_ring_space(struct hclge_cmq_ring *ring)
{
int ntu = ring->next_to_use;
int ntc = ring->next_to_clean;
int used = (ntu - ntc + ring->desc_num) % ring->desc_num;
return ring->desc_num - used - 1;
}
static int hclge_alloc_cmd_desc(struct hclge_cmq_ring *ring)
{
int size = ring->desc_num * sizeof(struct hclge_desc);
ring->desc = kzalloc(size, GFP_KERNEL);
if (!ring->desc)
return -ENOMEM;
ring->desc_dma_addr = dma_map_single(cmq_ring_to_dev(ring), ring->desc,
size, DMA_BIDIRECTIONAL);
if (dma_mapping_error(cmq_ring_to_dev(ring), ring->desc_dma_addr)) {
ring->desc_dma_addr = 0;
kfree(ring->desc);
ring->desc = NULL;
return -ENOMEM;
}
return 0;
}
static void hclge_free_cmd_desc(struct hclge_cmq_ring *ring)
{
dma_unmap_single(cmq_ring_to_dev(ring), ring->desc_dma_addr,
ring->desc_num * sizeof(ring->desc[0]),
DMA_BIDIRECTIONAL);
ring->desc_dma_addr = 0;
kfree(ring->desc);
ring->desc = NULL;
}
static int hclge_init_cmd_queue(struct hclge_dev *hdev, int ring_type)
{
struct hclge_hw *hw = &hdev->hw;
struct hclge_cmq_ring *ring =
(ring_type == HCLGE_TYPE_CSQ) ? &hw->cmq.csq : &hw->cmq.crq;
int ret;
ring->flag = ring_type;
ring->dev = hdev;
ret = hclge_alloc_cmd_desc(ring);
if (ret) {
dev_err(&hdev->pdev->dev, "descriptor %s alloc error %d\n",
(ring_type == HCLGE_TYPE_CSQ) ? "CSQ" : "CRQ", ret);
return ret;
}
ring->next_to_clean = 0;
ring->next_to_use = 0;
return 0;
}
void hclge_cmd_setup_basic_desc(struct hclge_desc *desc,
enum hclge_opcode_type opcode, bool is_read)
{
memset((void *)desc, 0, sizeof(struct hclge_desc));
desc->opcode = cpu_to_le16(opcode);
desc->flag = cpu_to_le16(HCLGE_CMD_FLAG_NO_INTR | HCLGE_CMD_FLAG_IN);
if (is_read)
desc->flag |= cpu_to_le16(HCLGE_CMD_FLAG_WR);
else
desc->flag &= cpu_to_le16(~HCLGE_CMD_FLAG_WR);
}
static void hclge_cmd_config_regs(struct hclge_cmq_ring *ring)
{
dma_addr_t dma = ring->desc_dma_addr;
struct hclge_dev *hdev = ring->dev;
struct hclge_hw *hw = &hdev->hw;
if (ring->flag == HCLGE_TYPE_CSQ) {
hclge_write_dev(hw, HCLGE_NIC_CSQ_BASEADDR_L_REG,
(u32)dma);
hclge_write_dev(hw, HCLGE_NIC_CSQ_BASEADDR_H_REG,
(u32)((dma >> 31) >> 1));
hclge_write_dev(hw, HCLGE_NIC_CSQ_DEPTH_REG,
(ring->desc_num >> HCLGE_NIC_CMQ_DESC_NUM_S) |
HCLGE_NIC_CMQ_ENABLE);
hclge_write_dev(hw, HCLGE_NIC_CSQ_TAIL_REG, 0);
hclge_write_dev(hw, HCLGE_NIC_CSQ_HEAD_REG, 0);
} else {
hclge_write_dev(hw, HCLGE_NIC_CRQ_BASEADDR_L_REG,
(u32)dma);
hclge_write_dev(hw, HCLGE_NIC_CRQ_BASEADDR_H_REG,
(u32)((dma >> 31) >> 1));
hclge_write_dev(hw, HCLGE_NIC_CRQ_DEPTH_REG,
(ring->desc_num >> HCLGE_NIC_CMQ_DESC_NUM_S) |
HCLGE_NIC_CMQ_ENABLE);
hclge_write_dev(hw, HCLGE_NIC_CRQ_TAIL_REG, 0);
hclge_write_dev(hw, HCLGE_NIC_CRQ_HEAD_REG, 0);
}
}
static void hclge_cmd_init_regs(struct hclge_hw *hw)
{
hclge_cmd_config_regs(&hw->cmq.csq);
hclge_cmd_config_regs(&hw->cmq.crq);
}
static int hclge_cmd_csq_clean(struct hclge_hw *hw)
{
struct hclge_cmq_ring *csq = &hw->cmq.csq;
u16 ntc = csq->next_to_clean;
struct hclge_desc *desc;
int clean = 0;
u32 head;
desc = &csq->desc[ntc];
head = hclge_read_dev(hw, HCLGE_NIC_CSQ_HEAD_REG);
while (head != ntc) {
memset(desc, 0, sizeof(*desc));
ntc++;
if (ntc == csq->desc_num)
ntc = 0;
desc = &csq->desc[ntc];
clean++;
}
csq->next_to_clean = ntc;
return clean;
}
static int hclge_cmd_csq_done(struct hclge_hw *hw)
{
u32 head = hclge_read_dev(hw, HCLGE_NIC_CSQ_HEAD_REG);
return head == hw->cmq.csq.next_to_use;
}
static bool hclge_is_special_opcode(u16 opcode)
{
u16 spec_opcode[3] = {0x0030, 0x0031, 0x0032};
int i;
for (i = 0; i < ARRAY_SIZE(spec_opcode); i++) {
if (spec_opcode[i] == opcode)
return true;
}
return false;
}
/**
* hclge_cmd_send - send command to command queue
* @hw: pointer to the hw struct
* @desc: prefilled descriptor for describing the command
* @num : the number of descriptors to be sent
*
* This is the main send command for command queue, it
* sends the queue, cleans the queue, etc
**/
int hclge_cmd_send(struct hclge_hw *hw, struct hclge_desc *desc, int num)
{
struct hclge_dev *hdev = (struct hclge_dev *)hw->back;
struct hclge_desc *desc_to_use;
bool complete = false;
u32 timeout = 0;
int handle = 0;
int retval = 0;
u16 opcode, desc_ret;
int ntc;
spin_lock_bh(&hw->cmq.csq.lock);
if (num > hclge_ring_space(&hw->cmq.csq)) {
spin_unlock_bh(&hw->cmq.csq.lock);
return -EBUSY;
}
/**
* Record the location of desc in the ring for this time
* which will be use for hardware to write back
*/
ntc = hw->cmq.csq.next_to_use;
opcode = desc[0].opcode;
while (handle < num) {
desc_to_use = &hw->cmq.csq.desc[hw->cmq.csq.next_to_use];
*desc_to_use = desc[handle];
(hw->cmq.csq.next_to_use)++;
if (hw->cmq.csq.next_to_use == hw->cmq.csq.desc_num)
hw->cmq.csq.next_to_use = 0;
handle++;
}
/* Write to hardware */
hclge_write_dev(hw, HCLGE_NIC_CSQ_TAIL_REG, hw->cmq.csq.next_to_use);
/**
* If the command is sync, wait for the firmware to write back,
* if multi descriptors to be sent, use the first one to check
*/
if (HCLGE_SEND_SYNC(desc->flag)) {
do {
if (hclge_cmd_csq_done(hw))
break;
udelay(1);
timeout++;
} while (timeout < hw->cmq.tx_timeout);
}
if (hclge_cmd_csq_done(hw)) {
complete = true;
handle = 0;
while (handle < num) {
/* Get the result of hardware write back */
desc_to_use = &hw->cmq.csq.desc[ntc];
desc[handle] = *desc_to_use;
pr_debug("Get cmd desc:\n");
if (likely(!hclge_is_special_opcode(opcode)))
desc_ret = desc[handle].retval;
else
desc_ret = desc[0].retval;
if ((enum hclge_cmd_return_status)desc_ret ==
HCLGE_CMD_EXEC_SUCCESS)
retval = 0;
else
retval = -EIO;
hw->cmq.last_status = (enum hclge_cmd_status)desc_ret;
ntc++;
handle++;
if (ntc == hw->cmq.csq.desc_num)
ntc = 0;
}
}
if (!complete)
retval = -EAGAIN;
/* Clean the command send queue */
handle = hclge_cmd_csq_clean(hw);
if (handle != num) {
dev_warn(&hdev->pdev->dev,
"cleaned %d, need to clean %d\n", handle, num);
}
spin_unlock_bh(&hw->cmq.csq.lock);
return retval;
}
enum hclge_cmd_status hclge_cmd_query_firmware_version(struct hclge_hw *hw,
u32 *version)
{
struct hclge_query_version *resp;
struct hclge_desc desc;
int ret;
hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_QUERY_FW_VER, 1);
resp = (struct hclge_query_version *)desc.data;
ret = hclge_cmd_send(hw, &desc, 1);
if (!ret)
*version = le32_to_cpu(resp->firmware);
return ret;
}
int hclge_cmd_init(struct hclge_dev *hdev)
{
u32 version;
int ret;
/* Setup the queue entries for use cmd queue */
hdev->hw.cmq.csq.desc_num = HCLGE_NIC_CMQ_DESC_NUM;
hdev->hw.cmq.crq.desc_num = HCLGE_NIC_CMQ_DESC_NUM;
/* Setup the lock for command queue */
spin_lock_init(&hdev->hw.cmq.csq.lock);
spin_lock_init(&hdev->hw.cmq.crq.lock);
/* Setup Tx write back timeout */
hdev->hw.cmq.tx_timeout = HCLGE_CMDQ_TX_TIMEOUT;
/* Setup queue rings */
ret = hclge_init_cmd_queue(hdev, HCLGE_TYPE_CSQ);
if (ret) {
dev_err(&hdev->pdev->dev,
"CSQ ring setup error %d\n", ret);
return ret;
}
ret = hclge_init_cmd_queue(hdev, HCLGE_TYPE_CRQ);
if (ret) {
dev_err(&hdev->pdev->dev,
"CRQ ring setup error %d\n", ret);
goto err_csq;
}
hclge_cmd_init_regs(&hdev->hw);
ret = hclge_cmd_query_firmware_version(&hdev->hw, &version);
if (ret) {
dev_err(&hdev->pdev->dev,
"firmware version query failed %d\n", ret);
return ret;
}
hdev->fw_version = version;
dev_info(&hdev->pdev->dev, "The firmware version is %08x\n", version);
return 0;
err_csq:
hclge_free_cmd_desc(&hdev->hw.cmq.csq);
return ret;
}
static void hclge_destroy_queue(struct hclge_cmq_ring *ring)
{
spin_lock_bh(&ring->lock);
hclge_free_cmd_desc(ring);
spin_unlock_bh(&ring->lock);
}
void hclge_destroy_cmd_queue(struct hclge_hw *hw)
{
hclge_destroy_queue(&hw->cmq.csq);
hclge_destroy_queue(&hw->cmq.crq);
}
