From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: "Jiang, Dave" <dave.jiang@intel.com>,
"linux-cxl@vger.kernel.org" <linux-cxl@vger.kernel.org>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"rafael@kernel.org" <rafael@kernel.org>,
"bp@alien8.de" <bp@alien8.de>,
"Williams, Dan J" <dan.j.williams@intel.com>,
"dave@stgolabs.net" <dave@stgolabs.net>,
"Schofield, Alison" <alison.schofield@intel.com>,
"Weiny, Ira" <ira.weiny@intel.com>
Subject: Re: [RFC PATCH 4/6] acpi/hmat: Add helper functions to provide extended linear cache translation
Date: Thu, 17 Oct 2024 17:59:42 +0100 [thread overview]
Message-ID: <20241017175942.000072b4@Huawei.com> (raw)
In-Reply-To: <SJ1PR11MB6083FB95773B782EA494C985FC472@SJ1PR11MB6083.namprd11.prod.outlook.com>
On Thu, 17 Oct 2024 16:46:35 +0000
"Luck, Tony" <tony.luck@intel.com> wrote:
> > What does the I/O hole correspond to in the system?
>
> PCIe mmio mapped space. 32-bit devices must have addresses below 4G
> so X86 systems have a physical memory map that looks like:
>
> 0 - 2G: RAM
> 2G-4G: MMIO
> 4G-end of memory: RAM
> end of memory-infinity: 64-bit MMIO
>
> Depending on how much MMIO there is different systems put the
> dividing line at other addresses than 2G.
Ah, thanks. So this weird cache setup might be not quite linear
module N aliases as described in the ACPI spec (System vs host
physical addresses I guess).
Had wrong mental model :(
Ouch.
>
> -Tony
>
next prev parent reply other threads:[~2024-10-17 16:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-27 14:16 [RFC PATCH 0/6] acpi/hmat / cxl: Add exclusive caching enumeration and RAS support Dave Jiang
2024-09-27 14:16 ` [RFC PATCH 1/6] ACPICA: actbl1.h: Add extended linear address mode to MSCIS Dave Jiang
2024-10-02 17:57 ` Rafael J. Wysocki
2024-09-27 14:16 ` [RFC PATCH 2/6] acpi: numa: Add support to enumerate and store extended linear address mode Dave Jiang
2024-10-17 16:00 ` Jonathan Cameron
2024-10-29 21:01 ` Dave Jiang
2024-09-27 14:16 ` [RFC PATCH 3/6] acpi/hmat / cxl: Add extended linear cache support for CXL Dave Jiang
2024-09-28 1:08 ` kernel test robot
2024-10-17 16:20 ` Jonathan Cameron
2024-10-29 22:04 ` Dave Jiang
2024-09-27 14:16 ` [RFC PATCH 4/6] acpi/hmat: Add helper functions to provide extended linear cache translation Dave Jiang
2024-10-17 16:33 ` Jonathan Cameron
2024-10-17 16:46 ` Luck, Tony
2024-10-17 16:59 ` Jonathan Cameron [this message]
2024-10-29 22:51 ` Dave Jiang
2024-10-30 22:53 ` Dave Jiang
2024-11-01 11:56 ` Jonathan Cameron
2024-09-27 14:16 ` [RFC PATCH 5/6] cxl: Add extended linear cache address alias emission for cxl events Dave Jiang
2024-10-17 16:38 ` Jonathan Cameron
2024-10-30 23:29 ` Dave Jiang
2024-09-27 14:16 ` [RFC PATCH 6/6] cxl: Add mce notifier to emit aliased address for extended linear cache Dave Jiang
2024-09-28 1:08 ` kernel test robot
2024-09-28 1:18 ` kernel test robot
2024-10-17 16:40 ` Jonathan Cameron
2024-10-30 23:37 ` Dave Jiang
2024-10-31 21:12 ` Dave Jiang
2024-10-17 16:46 ` [RFC PATCH 0/6] acpi/hmat / cxl: Add exclusive caching enumeration and RAS support Jonathan Cameron
2024-10-29 22:55 ` Dave Jiang
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