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(the ACPI spec does not seem to define that detail) Thanks, Leo. -----Original Message----- From: Jonathan Cameron Sent: Friday, February 23, 2024 11:26 AM To: Borislav Petkov Cc: shiju.jose@huawei.com; linux-cxl@vger.kernel.org; linux-acpi@vger.kerne= l.org; linux-mm@kvack.org; dan.j.williams@intel.com; dave@stgolabs.net; dav= e.jiang@intel.com; alison.schofield@intel.com; vishal.l.verma@intel.com; ir= a.weiny@intel.com; linux-edac@vger.kernel.org; linux-kernel@vger.kernel.org= ; david@redhat.com; Sridharan, Vilas ; Duran, Leo = ; Ghannam, Yazen ; rientjes@googl= e.com; jiaqiyan@google.com; tony.luck@intel.com; Grimm, Jon ; dave.hansen@linux.intel.com; rafael@kernel.org; lenb@kernel.org; naoy= a.horiguchi@nec.com; james.morse@arm.com; jthoughton@google.com; somasundar= am.a@hpe.com; erdemaktas@google.com; pgonda@google.com; duenwen@google.com;= mike.malvestuto@intel.com; gthelen@google.com; wschwartz@amperecomputing.c= om; dferguson@amperecomputing.com; tanxiaofei@huawei.com; prime.zeng@hisili= con.com; kangkang.shen@futurewei.com; wanghuiqiang@huawei.com; linuxarm@hua= wei.com Subject: Re: [RFC PATCH v7 00/12] memory: scrub: introduce subsystem + CXL/= ACPI-RAS2 drivers On Fri, 23 Feb 2024 16:42:51 +0100 Borislav Petkov wrote: > On Fri, Feb 23, 2024 at 10:37:11PM +0800, shiju.jose@huawei.com wrote: > > CXL patrol scrub and DDR5 ECS and ACPI RAS2 HW based memory patrol > > scrub features are added as use cases for the scrub subsystem to > > expose the scrub controls to the user. > > WTH is a RAS2 driver and where is the RAS1 driver? > Odd ACPI naming. RASF (which is very limited) was replaced by RAS2. Both are ACPI tables that describe the Platform Communication Channels (mailbox) + provide a definition of the protocol that is sent over it in or= der to control memory scrub. RAS2 has some other uses this driver isn't to= uching on. So in short, it's an ACPI spec defined interface for controlling Memory Scr= ub engines. https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#acp= i-ras2-feature-table-ras2 Jonathan