了解SMBIOS中的段组,总线,设备和功能编号

Question

目的

我正在尝试以编程方式找出特定PCIe设备连接的物理插槽.前提是我有卡的PCI-ID肯定会占用一个插槽,解决方案是找出哪一个.

请注意,我只对使用PCI Express总线感兴趣,尽管我认为设备识别/枚举过程与旧PCI相同.

尝试

该SMBIOS包含可用的主板插槽信息.可以从linux命令行检查这些信息:

$ sudo dmidecode -t slot
# dmidecode 2.11
SMBIOS 2.7 present.

Handle 0x003A, DMI type 9, 17 bytes
System Slot Information
    Designation: PCIEX16_1
    Type: x16 PCI Express x16
    Current Usage: In Use
    Length: Short
    ID: 1
    Characteristics:
        3.3 V is provided
        Opening is shared
        PME signal is supported
    Bus Address: 0000:03:02.0

Handle 0x003B, DMI type 9, 17 bytes
System Slot Information
    Designation: PCIEX16_2
    Type: x8 PCI Express x8
    Current Usage: In Use
    Length: Short
    ID: 2
    Characteristics:
        3.3 V is provided
        Opening is shared
        PME signal is supported
    Bus Address: 0000:04:02.2

Handle 0x003C, DMI type 9, 17 bytes
System Slot Information
    Designation: PCIEX16_3
    Type: x16 PCI Express x16
    Current Usage: In Use
    Length: Short
    ID: 3
    Characteristics:
        3.3 V is provided
        Opening is shared
        PME signal is supported
    Bus Address: 0000:05:03.0

然而,我无法找到在PCI总线(的任何装置lspci,其具有的PCI ID) 0000:03:02.0,0000:04:02.2或0000:05:03.0.我通过人工检查了解的内容如下:

1. 卡0000:03:00.0在第一个插槽中.PCI桥似乎是0000:00:02.0
2. 卡0000:04:00.0在第二个插槽中.PCI桥似乎是0000:00:02.2
3. 卡0000:05:00.0在第三个插槽中.PCI桥似乎是0000:00:03.0

所以这里出现了一种模式.从SMBIOS结构中,总线编号是插入的卡的总线编号,但设备/功能编号与相应的PCI桥相同.

这种模式在我的主板上是巧合还是有理由背后？它是华硕主板,带有AMI BIOS.我已经读过一些BIOS没有提供有关其插槽的准确信息,所以我想知道我可以实现多少通用性.

任何提示或指针参考文档也非常感谢.

Answer 1

您可能会发现该lspci命令很有帮助。这是一个示例输出：

# lspci -v -t
-[0000:00]-+-00.0  Intel Corporation 5500 I/O Hub to ESI Port
           +-01.0-[01]--+-00.0  Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet
           |            \-00.1  Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet
           +-03.0-[02]--+-00.0  Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet
           |            \-00.1  Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet
           +-07.0-[04]----00.0  LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator]
           +-09.0-[05]----00.0  LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator]
           +-14.0  Intel Corporation 7500/5520/5500/X58 I/O Hub System Management Registers
           +-14.1  Intel Corporation 7500/5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers
           +-14.2  Intel Corporation 7500/5520/5500/X58 I/O Hub Control Status and RAS Registers
           +-1a.0  Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4
           +-1a.1  Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5
           +-1a.7  Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2
           +-1c.0-[03]----00.0  LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator]
           +-1d.0  Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1
           +-1d.1  Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2
           +-1d.7  Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1
           +-1e.0-[06]----03.0  Matrox Electronics Systems Ltd. MGA G200eW WPCM450
           +-1f.0  Intel Corporation 82801IB (ICH9) LPC Interface Controller
           \-1f.2  Intel Corporation 82801IB (ICH9) 2 port SATA Controller [IDE mode]