From: Randy Dunlap <rdunlap@infradead.org>
To: Ben Widawsky <ben.widawsky@intel.com>, linux-cxl@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
linux-acpi@vger.kernel.org,
Dan Williams <dan.j.williams@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
"Kelley, Sean V" <sean.v.kelley@intel.com>,
Bjorn Helgaas <bhelgaas@google.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: [RFC PATCH 3/9] cxl/mem: Add a driver for the type-3 mailbox
Date: Tue, 10 Nov 2020 22:17:08 -0800 [thread overview]
Message-ID: <1dbfc3a3-5f81-90b2-5b0b-5dcb99e2eecd@infradead.org> (raw)
In-Reply-To: <20201111054356.793390-4-ben.widawsky@intel.com>
Hi,
On 11/10/20 9:43 PM, Ben Widawsky wrote:
> ---
> drivers/cxl/Kconfig | 20 +++++++++++
> drivers/cxl/Makefile | 2 ++
> drivers/cxl/mem.c | 82 ++++++++++++++++++++++++++++++++++++++++++++
> drivers/cxl/pci.h | 15 ++++++++
> 4 files changed, 119 insertions(+)
> diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig
> index dd724bd364df..15548f5c77ff 100644
> --- a/drivers/cxl/Kconfig
> +++ b/drivers/cxl/Kconfig
> @@ -27,4 +27,24 @@ config CXL_ACPI
> resources described by the CEDT (CXL Early Discovery Table)
>
> Say 'y' to enable CXL (Compute Express Link) drivers.
> +
> +config CXL_MEM
> + tristate "CXL.mem Device Support"
> + depends on PCI && CXL_BUS_PROVIDER != n
> + default m if CXL_BUS_PROVIDER
The "if CXL_BUS_PROVIDER" should be redundant due to the "depends on" clause.
However, having any default or 'm' or 'y' needs to be justified.
> + help
> + 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.
> +
> + Say 'y/m' to enable a driver named "cxl_mem.ko" that will attach
The builtin driver will not be named cxl-mem.ko.
> + to CXL.mem devices for configuration, provisioning, and health
> + monitoring, the so called "type-3 mailbox". Note, this driver
> + is required for dynamic provisioning of CXL.mem attached
> + memory, a pre-requisite for persistent memory support, but
prerequisite
> + devices that provide volatile memory may be fully described by
> + existing platform firmware memory enumeration.
> +
> + If unsure say 'n'.
> endif
--
~Randy
next prev parent reply other threads:[~2020-11-11 6:17 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-11 5:43 [RFC PATCH 0/9] CXL 2.0 Support Ben Widawsky
2020-11-11 5:43 ` [RFC PATCH 1/9] cxl/acpi: Add an acpi_cxl module for the CXL interconnect Ben Widawsky
2020-11-11 6:17 ` Randy Dunlap
2020-11-11 7:10 ` Christoph Hellwig
2020-11-11 7:30 ` Verma, Vishal L
2020-11-11 7:34 ` hch
2020-11-11 7:36 ` Verma, Vishal L
2020-11-11 23:03 ` Bjorn Helgaas
2020-11-16 17:59 ` Jonathan Cameron
2020-11-16 18:23 ` Verma, Vishal L
2020-11-17 14:32 ` Rafael J. Wysocki
2020-11-17 21:45 ` Dan Williams
2020-11-18 11:14 ` Rafael J. Wysocki
2020-11-11 5:43 ` [RFC PATCH 2/9] cxl/acpi: add OSC support Ben Widawsky
2020-11-16 17:59 ` Jonathan Cameron
2020-11-16 23:25 ` Dan Williams
2020-11-18 12:25 ` Rafael J. Wysocki
2020-11-18 17:58 ` Dan Williams
2020-11-11 5:43 ` [RFC PATCH 3/9] cxl/mem: Add a driver for the type-3 mailbox Ben Widawsky
2020-11-11 6:17 ` Randy Dunlap [this message]
2020-11-11 7:12 ` Christoph Hellwig
2020-11-11 17:17 ` Dan Williams
2020-11-11 18:27 ` Dan Williams
2020-11-11 21:41 ` Randy Dunlap
2020-11-11 22:40 ` Dan Williams
2020-11-16 16:56 ` Christoph Hellwig
2020-11-13 18:17 ` Bjorn Helgaas
2020-11-14 1:08 ` Ben Widawsky
2020-11-15 0:23 ` Dan Williams
2020-11-17 14:49 ` Jonathan Cameron
2020-12-04 7:22 ` Dan Williams
2020-12-04 7:27 ` Dan Williams
2020-12-04 17:39 ` Jonathan Cameron
2020-11-11 5:43 ` [RFC PATCH 4/9] cxl/mem: Map memory device registers Ben Widawsky
2020-11-13 18:17 ` Bjorn Helgaas
2020-11-14 1:12 ` Ben Widawsky
2020-11-16 23:19 ` Dan Williams
2020-11-17 0:23 ` Bjorn Helgaas
2020-11-23 19:20 ` Ben Widawsky
2020-11-23 19:32 ` Dan Williams
2020-11-23 19:58 ` Ben Widawsky
2020-11-17 15:00 ` Jonathan Cameron
2020-11-11 5:43 ` [RFC PATCH 5/9] cxl/mem: Find device capabilities Ben Widawsky
2020-11-13 18:26 ` Bjorn Helgaas
2020-11-14 1:36 ` Ben Widawsky
2020-11-17 15:15 ` Jonathan Cameron
2020-11-24 0:17 ` Ben Widawsky
2020-11-26 6:05 ` Jon Masters
2020-11-26 18:18 ` Ben Widawsky
2020-12-04 7:35 ` Dan Williams
2020-12-04 7:41 ` Dan Williams
2020-12-07 6:12 ` Ben Widawsky
2020-11-11 5:43 ` [RFC PATCH 6/9] cxl/mem: Initialize the mailbox interface Ben Widawsky
2020-11-17 15:22 ` Jonathan Cameron
2020-11-11 5:43 ` [RFC PATCH 7/9] cxl/mem: Implement polled mode mailbox Ben Widawsky
2020-11-13 23:14 ` Bjorn Helgaas
2020-11-17 15:31 ` Jonathan Cameron
2020-11-17 16:34 ` Ben Widawsky
2020-11-17 18:06 ` Jonathan Cameron
2020-11-17 18:38 ` Dan Williams
2020-11-11 5:43 ` [RFC PATCH 8/9] cxl/mem: Register CXL memX devices Ben Widawsky
2020-11-17 15:56 ` Jonathan Cameron
2020-11-20 2:16 ` Dan Williams
2020-11-20 15:20 ` Jonathan Cameron
2020-11-11 5:43 ` [RFC PATCH 9/9] MAINTAINERS: Add maintainers of the CXL driver Ben Widawsky
2020-11-11 22:06 ` [RFC PATCH 0/9] CXL 2.0 Support Ben Widawsky
2020-11-11 22:43 ` Bjorn Helgaas
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