Re: [PATCH V3 03/10] PCI/TPH: Add pci=notph to prevent use of TPH

[Bjorn Helgaas]

On Wed, Jul 24, 2024 at 03:45:34PM +0100, Alejandro Lucero Palau wrote:
> On 7/17/24 21:55, Wei Huang wrote:
> > TLP headers with incorrect steering tags (e.g. caused by buggy driver)
> > can potentially cause issues when the system hardware consumes the tags.
> > Provide a kernel option, with related helper functions, to completely
> > prevent TPH from being enabled.
> 
> Maybe rephrase it for including a potential buggy device, including the cpu.
> 
> Also, what about handling this with a no-tph-allow device list instead of a
> generic binary option for the whole system?
> 
> Foreseeing some buggy or poor-performance implementations, or specific use
> cases where it could be counterproductive, maybe supporting both options.

Makes sense if/when we need it.  IMO no point in adding an empty list
of known-broken devices.