From: Ben Widawsky <ben.widawsky@intel.com>
To: Jon Masters <jcm@jonmasters.org>
Cc: linux-cxl@vger.kernel.org, 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 5/9] cxl/mem: Find device capabilities
Date: Thu, 26 Nov 2020 10:18:29 -0800 [thread overview]
Message-ID: <20201126181829.vy3was5c42ixtwxm@intel.com> (raw)
In-Reply-To: <8d332852-9c54-95e0-58c7-72939f347aa6@jonmasters.org>
On 20-11-26 01:05:56, Jon Masters wrote:
> On 11/11/20 12:43 AM, Ben Widawsky wrote:
>
> > + case CXL_CAPABILITIES_CAP_ID_SECONDARY_MAILBOX:
> > + dev_dbg(&cxlm->pdev->dev,
> > + "found UNSUPPORTED Secondary Mailbox capability\n");
>
> Per spec, the secondary mailbox is intended for use by platform firmware, so
> Linux should never be using it anyway. Maybe that message is slightly
> misleading?
Yeah, I think the message could be reworded, but it is dev_dbg, so I wasn't too
worried about the wording in the first place. I think it is a mistake in this
case for the spec to describe the intended purpose. If the expectation is for
platform firmware to use it, but there is no negotiation mechanism in place,
it's essentially useless.
>
> Jon.
>
> P.S. Related - I've severe doubts about the mailbox approach being proposed
> by CXL and have begun to push back through the spec org.
Any reason not to articulate that here? Now that the spec is public, I don't see
any reason not to disclose that publicly.
next prev parent reply other threads:[~2020-11-26 18:18 UTC|newest]
Thread overview: 70+ 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
2020-11-15 4:32 ` kernel test robot
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
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
2020-11-15 11:26 ` kernel test robot
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 [this message]
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
2020-11-12 3:38 ` kernel test robot
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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