nvme命令如何发identify命令

NVMe (Non-Volatile Memory Express) 是一种高速的固态硬盘接口标准，而`nvme identify` 命令用于识别连接到系统上的 NVMe 设备的基本信息，包括设备型号、序列号等。在Linux系统中，你可以使用以下步骤来运行 `nvme identify`：

1. 打开终端：按下`Ctrl+Alt+T` 或者搜索“终端”应用。
2. 确保已经安装了必要的工具：如果系统上还未安装 `smartmontools` 或 `nvme-cli`，可以使用包管理器安装，如在Ubuntu/Debian上可以输入：

   sudo apt-get update
   sudo apt-get install nvme-cli

3. 运行`nvme identify`命令：找到你的NVMe设备名（通常以`nvmexprt`开头），例如：

   sudo nvme id-ctrl /dev/nvme0n1

将 `/dev/nvme0n1` 替换为你实际的设备路径。

4. 按照屏幕提示操作：`nvme identify` 可能会显示一些关于设备的信息，包括制造商、产品名称、序列号等，并可能要求确认是否继续。

相关问题

NVMe 裸机代码

NVMe（Non-Volatile Memory Express）是一种高速、低延迟的存储器协议，旨在优化闪存或其他非易失性存储器的性能。以下是一个简单的NVMe裸机代码示例，可以用于初始化NVMe控制器和与NVMe设备通信：

#include <stdint.h>

// NVMe寄存器地址
#define NVME_CAP 0x0
#define NVME_VS 0x8
#define NVME_INTMS 0x10
#define NVME_INTMC 0x18
#define NVME_CC 0x14
#define NVME_CSTS 0x1C
#define NVME_ASQ 0x20
#define NVME_ACQ 0x28

// NVMe命令
#define NVME_ADMIN_GET_LOG_PAGE 0x02
#define NVME_ADMIN_IDENTIFY 0x06
#define NVME_IO_READ 0x02
#define NVME_IO_WRITE 0x01

// NVMe命令队列大小
#define QUEUE_SIZE 64

// NVMe命令结构体
typedef struct {
    uint32_t dword0;
    uint32_t dword1;
    uint32_t dword2;
    uint32_t dword3;
    uint32_t dword4;
    uint32_t dword5;
    uint32_t dword6;
    uint32_t dword7;
} nvme_command_t;

// NVMe队列头结构体
typedef struct {
    uint16_t qid;
    uint16_t sq_head;
    uint16_t sq_tail;
    uint16_t cq_head;
    uint16_t cq_tail;
    uint16_t phase;
    uint16_t reserved[3];
} nvme_queue_head_t;

// NVMe控制器初始化
void nvme_init() {
    // 初始化NVMe寄存器
    uint32_t* nvme = (uint32_t*)0x1000;
    nvme[NVME_CAP] = 0x80000000;
    nvme[NVME_VS] = 0x1010000;
    nvme[NVME_INTMS] = 0;
    nvme[NVME_INTMC] = 0;
    nvme[NVME_CC] = 0x1;
    while ((nvme[NVME_CSTS] & 0x1) != 0x1);

    // 初始化命令队列
    nvme_queue_head_t* sq = (nvme_queue_head_t*)0x2000;
    nvme_queue_head_t* cq = (nvme_queue_head_t*)0x3000;
    for (int i = 0; i < QUEUE_SIZE; i++) {
        sq[i].qid = 0;
        sq[i].sq_head = i;
        sq[i].sq_tail = i;
        sq[i].cq_head = i;
        sq[i].cq_tail = i;
        sq[i].phase = 0;
        cq[i].qid = 0;
        cq[i].sq_head = i;
        cq[i].sq_tail = i;
        cq[i].cq_head = i;
        cq[i].cq_tail = i;
        cq[i].phase = 0;
    }
    nvme[NVME_ASQ] = 0x2000;
    nvme[NVME_ACQ] = 0x3000;
}

// 发送NVMe命令
void nvme_send_command(uint64_t lba, uint32_t count, uint8_t* buffer, uint8_t opcode) {
    nvme_queue_head_t* sq = (nvme_queue_head_t*)0x2000;
    nvme_queue_head_t* cq = (nvme_queue_head_t*)0x3000;

    // 选择空闲的命令队列项
    int index = -1;
    for (int i = 0; i < QUEUE_SIZE; i++) {
        if (sq[i].phase == 0 && cq[i].phase == 0) {
            index = i;
            break;
        }
    }

    // 填充命令项
    nvme_command_t* cmd = (nvme_command_t*)(0x4000 + 64 * index);
    cmd->dword0 = (count - 1) << 16 | opcode;
    cmd->dword1 = 0;
    cmd->dword2 = (uint32_t)lba;
    cmd->dword3 = (uint32_t)(lba >> 32);
    cmd->dword4 = (uint32_t)buffer;
    cmd->dword5 = (uint32_t)(buffer >> 32);
    cmd->dword6 = 0;
    cmd->dword7 = 0;

    // 发送命令
    sq[index].phase = 1;
    uint32_t* nvme = (uint32_t*)0x1000;
    nvme[NVME_ASQ] = 0x2000 + index * 64;
    nvme[NVME_ACQ] = 0x3000 + index * 64;
    nvme[NVME_CC] |= 0x1;
    while ((nvme[NVME_CSTS] & 0x1) != 0x1);
}

// 接收NVMe命令完成
void nvme_poll_completion() {
    uint32_t* nvme = (uint32_t*)0x1000;
    if ((nvme[NVME_CSTS] & 0x2) != 0x2) {
        return;
    }
    nvme[NVME_CSTS] = 0x2;
    nvme_queue_head_t* cq = (nvme_queue_head_t*)0x3000;
    for (int i = 0; i < QUEUE_SIZE; i++) {
        if (cq[i].phase == 1) {
            cq[i].phase = 0;
            break;
        }
    }
}

// 读取NVMe设备
void nvme_read(uint64_t lba, uint32_t count, uint8_t* buffer) {
    nvme_send_command(lba, count, buffer, NVME_IO_READ);
    while (1) {
        nvme_poll_completion();
        if (count == 0) {
            break;
        }
        lba++;
        buffer += 512;
        count--;
    }
}

// 写入NVMe设备
void nvme_write(uint64_t lba, uint32_t count, uint8_t* buffer) {
    nvme_send_command(lba, count, buffer, NVME_IO_WRITE);
    while (1) {
        nvme_poll_completion();
        if (count == 0) {
            break;
        }
        lba++;
        buffer += 512;
        count--;
    }
}

以上代码仅作为示例，实际应用中需要考虑更多因素，并进行适当修改。

有zynq NVMe例程吗

是的，有Zynq NVMe例程。以下是一个基本的Zynq NVMe例程，该例程使用Zynq的PCIe接口连接到NVMe设备：

#include <stdlib.h>
#include <stdio.h>
#include <xil_printf.h>
#include <xil_io.h>

#define NVME_BAR0_ADDR 0x10000000
#define NVME_BAR1_ADDR 0x10100000

#define NVME_CAP       0x00
#define NVME_VS        0x08
#define NVME_INTMS     0x0C
#define NVME_INTMC     0x10
#define NVME_CC        0x14
#define NVME_CSTS      0x1C
#define NVME_AQA       0x24
#define NVME_ASQ       0x28
#define NVME_ACQ       0x30

void nvme_write_reg(u32 reg_addr, u32 value) {
    Xil_Out32(NVME_BAR0_ADDR + reg_addr, value);
}

u32 nvme_read_reg(u32 reg_addr) {
    return Xil_In32(NVME_BAR0_ADDR + reg_addr);
}

int main() {
    // Reset the NVMe controller
    nvme_write_reg(NVME_CC, 0x00000001);
    while (nvme_read_reg(NVME_CSTS) & 0x00000001);

    // Configure the NVMe controller
    nvme_write_reg(NVME_CAP, 0x00000000);
    nvme_write_reg(NVME_VS, 0x00010000);
    nvme_write_reg(NVME_INTMS, 0x00000000);
    nvme_write_reg(NVME_INTMC, 0xFFFFFFFF);
    nvme_write_reg(NVME_AQA, 0x00000000);
    nvme_write_reg(NVME_ASQ, NVME_BAR1_ADDR);
    nvme_write_reg(NVME_ACQ, NVME_BAR1_ADDR + 0x1000);
    nvme_write_reg(NVME_CC, 0x00000007);

    // Wait for the NVMe controller to be ready
    while ((nvme_read_reg(NVME_CSTS) & 0x00000001) == 0);

    // Issue a Identify Controller command
    nvme_write_reg(NVME_ASQ + 0x00, 0x00000006);
    nvme_write_reg(NVME_ASQ + 0x04, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x08, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x0C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x10, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x14, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x18, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x1C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x20, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x24, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x28, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x2C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x30, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x34, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x38, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x3C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x40, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x44, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x48, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x4C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x50, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x54, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x58, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x5C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x60, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x64, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x68, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x6C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x70, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x74, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x78, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x7C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x80, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x84, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x88, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x8C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x90, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x94, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x98, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0x9C, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xA0, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xA4, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xA8, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xAC, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xB0, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xB4, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xB8, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xBC, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xC0, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xC4, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xC8, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xCC, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xD0, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xD4, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xD8, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xDC, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xE0, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xE4, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xE8, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xEC, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xF0, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xF4, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xF8, 0x00000000);
    nvme_write_reg(NVME_ASQ + 0xFC, 0x00000001);

    // Wait for the command to complete
    while ((nvme_read_reg(NVME_CSTS) & 0x00000002) == 0);

    // Read the Identify Controller data
    u32 *identify_controller_data = (u32 *)(NVME_BAR1_ADDR + 0x1000);
    for (int i = 0; i < 16; i++) {
        xil_printf("Identify Controller data[%d]: 0x%08X\n", i, identify_controller_data[i]);
    }

    return 0;
}

该例程首先重置NVMe控制器，然后配置控制器并等待其准备好。然后，该例程发出一个Identify Controller命令，读取Identify Controller数据，并打印该数据。请注意，此示例代码仅用于参考，需要根据实际情况进行修改。