60 lines
1.9 KiB
Markdown
60 lines
1.9 KiB
Markdown
# Vendor Reset
|
|
|
|
The goal of this project is to provide a kernel module that is capable of
|
|
resetting hardware devices into a state where they can be re-initialized or
|
|
passed through into a virtual machine (VFIO). While it would be great to have
|
|
these in the kernel as PCI quirks, some of the reset procedures are very complex
|
|
and would never be accepted as a quirk (ie AMD Vega 10).
|
|
|
|
By providing this as an out of tree kernel module, vendors will be able to
|
|
easily create pull requests to add functionality to this module, and users will
|
|
be able to easily update this module without requiring a complete kernel rebuild.
|
|
|
|
## Patching the kernel
|
|
|
|
TL;DR - No patching required.
|
|
|
|
This module has been written to use `ftrace` to hook `pci_dev_specific_reset`,
|
|
allowing it to handle device resets directly without patching the running
|
|
kernel. Simply modprobing the module is enough to enable the reset routines for
|
|
all supported hardware.
|
|
|
|
## Installing
|
|
|
|
This module can be installed either using the standard `make`, `make install`
|
|
pattern, or through `dkms` (recommended).
|
|
|
|
dkms install .
|
|
|
|
## Usage
|
|
|
|
Either `modprobe vendor-reset` or add the device to the appropriate place to
|
|
load it at system boot, such as `/etc/modules` (Debian). Consult your
|
|
distribution's documentation as to the best way to perform this.
|
|
|
|
## Supported Devices
|
|
|
|
| Vendor | Family | Common Name(s)
|
|
|---|---|---|
|
|
|AMD|Polaris 10|
|
|
|AMD|Polaris 11|
|
|
|AMD|Polaris 12|
|
|
|AMD|Vega 10| Vega 56/64 |
|
|
|AMD|Vega 20| Radeon VII |
|
|
|AMD|Navi 10| 5600XT, 5700, 5700XT
|
|
|AMD|Navi 12| Pro 5600M |
|
|
|AMD|Navi 14| Pro 5300, RX 5300, 5500XT
|
|
|
|
## Developing
|
|
|
|
If you are a vendor intending to add support for your device to this project
|
|
please first consider two things:
|
|
|
|
1. Can you fix your hardware/firmware to reset correctly using FLR or a BUS
|
|
reset?
|
|
2. Is the reset simple enough that it should really be a kernel pci quirk
|
|
(see: kernel/drivers/pci/quirk.c)?
|
|
|
|
If you answer yes to either of these questions this project is not for you.
|
|
|