Messages in this thread | | | Date | Fri, 19 Feb 2021 20:03:57 -0500 | From | Konrad Rzeszutek Wilk <> | Subject | Re: [PATCH v5 5/9] cxl/mem: Add a "RAW" send command |
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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@microchip.com> > Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> > Reviewed-by: Dan Williams <dan.j.williams@intel.com> (v2) > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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