On Tue, Feb 16, 2021 at 08:09:54PM -0800, Ben Widawsky wrote: > The CXL memory device send interface will have a number of supported > commands. The raw command is not such a command. Raw commands allow > userspace to send a specified opcode to the underlying hardware and > bypass all driver checks on the command. The primary use for this > command is to [begrudgingly] allow undocumented vendor specific hardware > commands. > > While not the main motivation, it also allows prototyping new hardware > commands without a driver patch and rebuild. > > While this all sounds very powerful it comes with a couple of caveats: > 1. Bug reports using raw commands will not get the same level of > attention as bug reports using supported commands (via taint). > 2. Supported commands will be rejected by the RAW command. > > With this comes new debugfs knob to allow full access to your toes with > your weapon of choice. > > Cc: Ariel Sibley <Ariel.Sibley@xxxxxxxxxxxxx> > Signed-off-by: Ben Widawsky <ben.widawsky@xxxxxxxxx> > Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx> (v2) > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
