On Tue, Feb 16, 2021 at 08:09:50PM -0800, Ben Widawsky wrote: > From: Dan Williams <dan.j.williams@xxxxxxxxx> > > The CXL.mem protocol allows a device to act as a provider of "System > RAM" and/or "Persistent Memory" that is fully coherent as if the memory > was attached to the typical CPU memory controller. > > With the CXL-2.0 specification a PCI endpoint can implement a "Type-3" > device interface and give the operating system control over "Host > Managed Device Memory". See section 2.3 Type 3 CXL Device. > > The memory range exported by the device may optionally be described by > the platform firmware memory map, or by infrastructure like LIBNVDIMM to > provision persistent memory capacity from one, or more, CXL.mem devices. > > A pre-requisite for Linux-managed memory-capacity provisioning is this > cxl_mem driver that can speak the mailbox protocol defined in section > 8.2.8.4 Mailbox Registers. > > For now just land the initial driver boiler-plate and Documentation/ > infrastructure. > > Link: https://www.computeexpresslink.org/download-the-specification > Cc: Jonathan Corbet <corbet@xxxxxxx> > Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> > Signed-off-by: Ben Widawsky <ben.widawsky@xxxxxxxxx> > Acked-by: David Rientjes <rientjes@xxxxxxxxxx> (v1) Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Albeit you may want to modify 2020 to 2021 in the Copyright sections.
