ffx driver 命令可以检索有关 Fuchsia 设备上驱动程序的各种类型信息。
概念
ffx driver 命令可以检索与目标 Fuchsia 设备（或模拟器）上当前可用或正在运行的驱动程序相关的信息。不过，ffx driver 命令需要您能够从主机建立到目标 Fuchsia 设备的 SSH 连接。如需验证与设备的连接，您可以运行 ffx target show 命令。
在使用 ffx driver 命令之前，建议您先熟悉驱动程序框架 (DFv2) 中的基本概念，尤其是以下概念：
- 设备节点 - 设备节点代表硬件组件、虚拟设备或硬件设备的一部分。
- 节点拓扑 - 节点拓扑描述了系统中设备节点之间的父子关系。
- 驱动程序主机 - 驱动程序主机作为 Fuchsia 组件运行，可在 Fuchsia 系统中的驱动程序之间提供隔离。在 Fuchsia 中，每个驱动程序都位于驱动程序主机中，多个驱动程序可以位于同一驱动程序主机中。
查看司机
如需查看 Fuchsia 设备上可用的所有驱动程序，请运行以下命令：
ffx driver list
此命令会输出类似于以下内容的输出：
$ ffx driver list
fuchsia-boot:///alc5663#meta/alc5663.cm
fuchsia-boot:///asix-88179#meta/asix-88179.cm
fuchsia-boot:///asix-88772b#meta/asix-88772b.cm
fuchsia-boot:///block-core#meta/block.core.cm
fuchsia-boot:///bt-transport-usb#meta/bt-transport-usb.cm
fuchsia-boot:///bus-pci#meta/bus-pci.cm
fuchsia-boot:///buttons#meta/buttons.cm
fuchsia-boot:///clock#meta/clock.cm
fuchsia-boot:///ctaphid#meta/ctaphid.cm
fuchsia-boot:///display-coordinator#meta/display-coordinator.cm
fuchsia-boot:///e1000#meta/e1000.cm
fuchsia-boot:///ftdi#meta/ftdi.cm
fuchsia-boot:///fvm#meta/fvm.cm
...
如需查看 Fuchsia 设备上可用的所有驱动程序以及更多详细信息，请运行带有 -v 标志的命令：
ffx driver list -v
此命令会输出类似于以下内容的输出：
$ ffx driver list -v
URL : fuchsia-pkg://fuchsia.com/iwlwifi#meta/iwlwifi.cm
DF Version: 2
Device Categories: [misc]
Bind rules bytecode:
fuchsia.BIND_FIDL_PROTOCOL == 4
fuchsia.BIND_PCI_VID == 32902
Jump if fuchsia.BIND_PCI_DID == 2394 to ??
Jump if fuchsia.BIND_PCI_DID == 2395 to ??
Jump if fuchsia.BIND_PCI_DID == 9469 to ??
Jump if fuchsia.BIND_PCI_DID == 9510 to ??
Jump if fuchsia.BIND_PCI_DID == 41200 to ??
Abort
Label ??
fuchsia.BIND_COMPOSITE == 1
URL : fuchsia-boot:///virtio_rng#meta/virtio_rng.cm
DF Version: 1
Device Categories: [misc]
Bind rules bytecode:
Node (primary): pci
fuchsia.BIND_FIDL_PROTOCOL == 4
fuchsia.BIND_PCI_VID == 6900
Jump if fuchsia.BIND_PCI_DID == 4164 to ??
Jump if fuchsia.BIND_PCI_DID == 4101 to ??
...
查看正在运行的驱动程序
如需查看 Fuchsia 设备上当前正在运行（加载）的所有驱动程序，请使用 -loaded 标志运行以下命令：
ffx driver list --loaded
此命令会输出类似于以下内容的输出：
$ ffx driver list --loaded
fuchsia-boot:///#meta/block.core.cm
fuchsia-boot:///#meta/bus-pci.cm
fuchsia-boot:///#meta/display.cm
fuchsia-boot:///#meta/fvm.cm
fuchsia-boot:///#meta/goldfish-display.cm
fuchsia-boot:///#meta/goldfish.cm
fuchsia-boot:///#meta/goldfish_address_space.cm
fuchsia-boot:///#meta/goldfish_control.cm
fuchsia-boot:///#meta/goldfish_sensor.cm
fuchsia-boot:///#meta/goldfish_sync.cm
fuchsia-boot:///#meta/hid-input-report.cm
fuchsia-boot:///#meta/hid.cm
fuchsia-boot:///#meta/intel-hda.cm
...
查看驱动程序主机
如需查看 Fuchsia 设备上运行的所有驱动程序主机以及它们托管的驱动程序，请运行以下命令：
ffx driver list-hosts
此命令会输出类似于以下内容的输出：
$ ffx driver list-hosts
Driver Host: 5416
fuchsia-boot:///#meta/bus-pci.cm
fuchsia-boot:///#meta/display.cm
fuchsia-boot:///#meta/goldfish-display.cm
fuchsia-boot:///#meta/goldfish.cm
fuchsia-boot:///#meta/goldfish_control.cm
...
Driver Host: 8248
fuchsia-boot:///#meta/intel-rtc.cm
Driver Host: 8317
fuchsia-boot:///#meta/pc-ps2.cm
Driver Host: 9604
fuchsia-boot:///#meta/block.core.cm
fuchsia-boot:///#meta/fvm.cm
fuchsia-boot:///#meta/virtio_block.cm
...
查看节点拓扑
如需查看 Fuchsia 设备的整个节点拓扑，请运行以下命令：
ffx driver dump
此命令会输出类似于以下内容的输出：
$ ffx driver dump
[dev] pid=5521 fuchsia-boot:///platform-bus#meta/platform-bus.cm
[sys] pid=None unbound
[platform] pid=None unbound
[ram-disk] pid=7584 fuchsia-boot:///ramdisk#meta/ramdisk.cm
[ramctl] pid=None unbound
[00_00_2e] pid=None unbound
[virtual-audio] pid=25117 fuchsia-pkg://fuchsia.com/virtual_audio#meta/virtual_audio_driver.cm
[virtual_audio] pid=None unbound
[bt-hci-emulator] pid=None unbound
[fake-battery] pid=24707 fuchsia-pkg://fuchsia.com/fake-battery#meta/fake_battery.cm
[fake-battery] pid=None unbound
[power-simulator] pid=None unbound
[pt] pid=5521 fuchsia-boot:///platform-bus-x86#meta/pl
...
查看特定节点下的节点拓扑
如需仅查看特定节点下的节点拓扑的子图，请运行以下命令：
ffx driver dump <NODE_NAME>
将 NODE_NAME 替换为目标节点的名称，例如：
$ ffx driver dump goldfish-control
[goldfish-control] pid=5521 fuchsia-boot:///goldfish_display#meta/goldfish-display.cm
[goldfish-display] pid=5521 fuchsia-boot:///display-coordinator#meta/display-coordinator.cm
[display-coordinator] pid=None unbound
...
绘制节点拓扑图
如需绘制节点拓扑图，请运行以下命令：
ffx driver driver dump --graph
此命令会输出类似于以下内容的输出：
$ ffx driver driver dump --graph
digraph {
forcelabels = true; splines="ortho"; ranksep = 1.2; nodesep = 0.5;
node [ shape = "box" color = " #2a5b4f" penwidth = 2.25 fontname = "prompt medium" fontsize = 10 margin = 0.22 ];
edge [ color = " #37474f" penwidth = 1 style = dashed fontname = "roboto mono" fontsize = 10 ];
"3675787314320" [label="dev"]
"3675787305008" [label="sys"]
"3675787315872" [label="platform"]
"3675787309664" [label="ram-disk"]
"3675787306560" [label="00_00_2e"]
"3675787308112" [label="virtual-audio"]
"3675787312768" [label="bt-hci-emulator"]
"3675787311216" [label="fake-battery"]
"3675787325184" [label="pt"]
"3675787317424" [label="00_00_1b"]
...
如需将此输出转换为 png 文件，您可以安装 dot 命令，并传递输出以生成 png 文件。或者，您也可以将输出粘贴到 GraphViz。
查看设备节点
如需查看 Fuchsia 设备上所有设备节点的属性，请运行以下命令：
ffx driver list-devices
此命令会输出类似于以下内容的输出：
$ ffx driver list-devices
dev
dev.sys
dev.sys.platform
dev.sys.platform.ram-disk
dev.sys.platform.00_00_2e
dev.sys.platform.virtual-audio
dev.sys.platform.bt-hci-emulator
dev.sys.platform.fake-battery
dev.sys.platform.pt
dev.sys.platform.00_00_1b
dev.sys.platform.ram-disk.ramctl
dev.sys.platform.virtual-audio.virtual_audio
dev.sys.platform.fake-battery.fake-battery
dev.sys.platform.fake-battery.power-simulator
dev.sys.platform.pt.PCI0
dev.sys.platform.pt.acpi
dev.sys.platform.00_00_1b.sysmem
dev.sys.platform.pt.PCI0.bus
dev.sys.platform.pt.acpi.acpi-_SB_
dev.sys.platform.pt.acpi.acpi-_TZ_
dev.sys.platform.00_00_1b.sysmem.sysmem-banjo
dev.sys.platform.00_00_1b.sysmem.sysmem-fidl
dev.sys.platform.pt.PCI0.bus.00_00.0
dev.sys.platform.pt.PCI0.bus.00_01.0
dev.sys.platform.pt.PCI0.bus.00_02.0
...
如需查看包含更详细的设备节点的属性，请运行带有 -v 标志的命令：
ffx driver list-devices -v
此命令会输出类似于以下内容的输出：
$ ffx driver list-devices -v
...
Name : i2c-child
Moniker : root.sys.platform.platform-passthrough.acpi.acpi-FWCF.i2c-child
Driver : None
3 Properties
[ 1/ 3] : Key "fuchsia.hardware.i2c" Value Enum(fuchsia.hardware.i2c.Device.ZirconTransport)
[ 2/ 3] : Key fuchsia.BIND_I2C_ADDRESS Value 0x0000ff
[ 3/ 3] : Key "fuchsia.driver.framework.dfv2" Value true
...
查看特定路径下的设备节点
如需查看按节点拓扑中的特定路径过滤的设备节点，请在命令中添加确切的拓扑路径或设备名称：
ffx driver list-devices <NODE>
将 NODE 替换为拓扑路径或设备名称。例如，以下示例显示了结果是按 acpi 处的拓扑路径过滤的：
$ ffx driver list-devices acpi
dev.sys.platform.pt.acpi
dev.sys.platform.pt.acpi.acpi-_SB_
dev.sys.platform.pt.acpi.acpi-_TZ_
dev.sys.platform.pt.acpi.acpi-_SB_.pt
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-PCI0
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-HPET
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-LNKE
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-LNKF
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-LNKG
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-LNKH
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-GSIE
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-GSIF
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-GSIG
dev.sys.platform.pt.acpi.acpi-_SB_.acpi-GSIH
...
您还可以将此参数与 -v 标志结合使用，以获取更详细的信息，例如：
$ ffx driver list-devices acpi -v
Name : acpi
Moniker : dev.sys.platform.pt.acpi
Driver : unbound
2 Properties
[ 1/ 2] : Key fuchsia.BIND_PROTOCOL Value 0x00001c
[ 2/ 2] : Key "fuchsia.platform.DRIVER_FRAMEWORK_VERSION" Value 0x000002
1 Offers
Service: fuchsia.driver.compat.Service
Source: dev.sys.platform.pt
Instances: default
Name : acpi-_SB_
Moniker : dev.sys.platform.pt.acpi.acpi-_SB_
Driver : unbound
2 Properties
[ 1/ 2] : Key fuchsia.BIND_PROTOCOL Value 0x00001c
[ 2/ 2] : Key "fuchsia.platform.DRIVER_FRAMEWORK_VERSION" Value 0x000002
1 Offers
Service: fuchsia.driver.compat.Service
Source: dev.sys.platform.pt
Instances: default
...
查看复合节点
如需查看 Fuchsia 设备上的所有复合节点，请运行以下命令：
ffx driver list-composites
此命令会输出类似于以下内容的输出：
$ ffx driver list-composites
...
acpi-GFRO-composite
acpi-CPUS-composite
acpi-_TZ_-composite
goldfish-control-2
00:00.0
00:01.0
00:02.0
00:03.0
00:04.0
00:05.0
00:06.0
00:0b.0
...
如需查看具有更多详细信息的复合节点，请运行带有 -v 标志的命令：
ffx driver list-composites -v
此命令会输出类似于以下内容的输出：
$ ffx driver list-composites -v
...
Name : 00_02_0
Driver : fuchsia-boot:///#meta/virtio_block.cm
Device : dev/sys/platform/pt/PCI0/bus/00:02.0/00_02_0
Parents : 3
Parent 0 : sysmem
Device : dev/sys/platform/00:00:1b/sysmem/sysmem-fidl
Parent 1 : pci (Primary)
Device : dev/sys/platform/pt/PCI0/bus/00:02.0
Parent 2 : acpi
Device : dev/sys/platform/pt/acpi/acpi-_SB_/acpi-PCI0/acpi-S10_/pt
...
查看复合节点规范
如需查看 Fuchsia 设备上的所有复合节点规范，请运行以下命令：
ffx driver list-composite-node-specs
此命令会输出类似于以下内容的输出：
$ ffx driver list-composite-node-specs
...
00_1f_0 : None
00_1f_2 : fuchsia-boot:///ahci#meta/ahci.cm
00_06_0 : None
00_02_0 : fuchsia-boot:///virtio_block#meta/virtio_block.cm
00_1f_3 : None
00_05_0 : fuchsia-boot:///virtio_input#meta/virtio_input.cm
00_0b_0 : fuchsia-boot:///goldfish_address_space#meta/goldfish_address_space.cm
00_01_0 : fuchsia-boot:///intel-hda#meta/intel-hda.cm
00_03_0 : fuchsia-boot:///virtio_input#meta/virtio_input.cm
00_04_0 : fuchsia-boot:///virtio_netdevice#meta/virtio_netdevice.cm
00_00_0 : None
...
如需查看包含更多详细信息的复合节点规范，请运行带有 -v 标志的命令：
ffx driver list-composite-node-specs -v
此命令会输出类似于以下内容的输出：
$ ffx driver list-composite-node-specs -v
...
Name : ft3x27_touch
Driver : fuchsia-boot:///#meta/focaltech.cm
Nodes : 2
Node 0 : "i2c" (Primary)
3 Bind Rules
[ 1/ 3] : Accept "fuchsia.BIND_FIDL_PROTOCOL" { 0x000003 }
[ 2/ 3] : Accept "fuchsia.BIND_I2C_BUS_ID" { 0x000001 }
[ 3/ 3] : Accept "fuchsia.BIND_I2C_ADDRESS" { 0x000038 }
2 Properties
[ 1/ 2] : Key "fuchsia.BIND_FIDL_PROTOCOL" Value 0x000003
[ 2/ 2] : Key "fuchsia.BIND_I2C_ADDRESS" Value 0x000038
Node 1 : "gpio-int"
2 Bind Rules
[ 1/ 2] : Accept "fuchsia.BIND_PROTOCOL" { 0x000014 }
[ 2/ 2] : Accept "fuchsia.BIND_GPIO_PIN" { 0x000004 }
2 Properties
[ 1/ 2] : Key "fuchsia.BIND_PROTOCOL" Value 0x000014
[ 2/ 2] : Key "fuchsia.gpio.FUNCTION" Value "fuchsia.gpio.FUNCTION.TOUCH_INTERRUPT"
...
附录
将组件注册为驱动程序
如需将某个组件注册为 Fuchsia 设备的驱动程序，请运行以下命令：
ffx driver register <URL>
将 URL 替换为 Fuchsia 软件包服务器中的组件网址，例如：
$ ffx driver register fuchsia-pkg://fuchsia.com/my_example#meta/my_new_driver.cm
停用驱动程序
如需从 Fuchsia 设备停用（即取消注册）驱动程序，请运行以下命令：
ffx driver disable <URL>
将 URL 替换为 Fuchsia 软件包服务器中的组件网址，例如：
$ ffx driver disable fuchsia-pkg://fuchsia.com/my_example#meta/my_driver.cm