From: Boaz Harrosh <boaz@plexistor.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>, X86 ML <x86@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"Roger C. Pao" <rcpao.enmotus@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-nvdimm <linux-nvdimm@ml01.01.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Matthew Wilcox <willy@linux.intel.com>,
Andy Lutomirski <luto@amacapital.net>,
Christoph Hellwig <hch@infradead.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>
Subject: Re: [PATCH 3/3] e820: Add the unknown-12 Memory type (DDR3-NvDIMM)
Date: Mon, 09 Mar 2015 13:19:35 +0200 [thread overview]
Message-ID: <54FD81C7.3080000@plexistor.com> (raw)
In-Reply-To: <CAPcyv4i5WfR48hmGwqLDgTFRpUPaAxusHXKKUKY4FBxu1Mqm+w@mail.gmail.com>
On 03/05/2015 10:56 PM, Dan Williams wrote:
> On Thu, Mar 5, 2015 at 2:24 AM, Boaz Harrosh <boaz@plexistor.com> wrote:
>>
<>
>> Now the ACPI comity, as far as I know, did not yet define a
>> standard type for NvDIMM. Also, as far as I know any NvDIMM
>> standard will only be defined for DDR4. So DDR3 NvDIMM is
>> probably stuck with this none STD type.
>
> There's no relation between E820 types and DDR technology revisions.
>
Yes and no, I mean the DDR4 has extra legs and signals defined
for NvDIMM. So DDR3 will always mean different style of NvDIMM.
You tell me. Say the standard finally comes out. Will I have a
new bios from Intel for my DDR3 system here in the lab that will
report the new STD type ?
What I meant is that DDR3 is too old for the proposed STD and probably
only DDR4 NvDIMMs will be supported in systems. The way the STD defined
it.
<>
>> In this patch I name type-12 "unknown-12". This is because of
>> ACPI politics that refuse to reserve type-12 as DDR3-NvDIMM
>
> It's not "politics". Setting standards takes time and the platforms
> in question simply jumped the gun to enable a proof-of-concept.
>
So ye, but once you have 100,000 devices out there, then the dichotomy
between standards-takes-time vs proof-of-concept, becomes politics.
This is the definition of politics, when life moves faster than some
"body", the "body" stands on its back feet and shoots fire from
his head.
>> and members keep saying:
>> "What if ACPI assigns type-12 for something else in future"
>>
>> [And I say: Then just don't. Please?]
>
> Once a standard number is assigned, platform firmwares can update
> type-12 to that number. We might consider a compile time override for
> these niche/pre-standard systems that can't/won't update, but it's not
> clear to me that we even need to go that far.
>
OK, so I do not understand what you want. Yes or No to this patch?
This patch with unknown-12 is for NOW. For systems already running.
So we can differentiate between reserved-unknown which might mean
type-13 and this here bastard type-12 which we know is NvDIMM but
for future sake we do not call by name?
Or maybe we should call it NVDIMM-12 ?
Thanks
Boaz
next prev parent reply other threads:[~2015-03-09 11:19 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-05 10:16 [PATCH 0/3 v5] e820: Fix handling of NvDIMM chips Boaz Harrosh
2015-03-05 10:20 ` [PATCH 1/3] e820: Don't let unknown DIMM type come out BUSY Boaz Harrosh
2015-03-05 20:41 ` Dan Williams
2015-03-09 10:54 ` Boaz Harrosh
2015-03-05 10:21 ` [PATCH 2/3] resource: Add new flag IORESOURCE_MEM_WARN Boaz Harrosh
2015-03-05 10:24 ` [PATCH 3/3] e820: Add the unknown-12 Memory type (DDR3-NvDIMM) Boaz Harrosh
2015-03-05 20:56 ` Dan Williams
2015-03-05 23:09 ` Andy Lutomirski
2015-03-09 12:10 ` Boaz Harrosh
2015-03-10 5:11 ` joeyli
2015-03-10 8:56 ` Boaz Harrosh
2015-03-10 13:19 ` Andy Lutomirski
2015-03-09 11:19 ` Boaz Harrosh [this message]
2015-03-09 14:44 ` Dan Williams
2015-03-09 15:14 ` Andy Lutomirski
2015-03-09 15:17 ` Dan Williams
2015-03-10 8:47 ` Boaz Harrosh
2015-03-05 10:32 ` [RFC 0/8] pmem: Submission of the Persistent memory block device Boaz Harrosh
2015-03-05 11:55 ` [PATCH 1/8] pmem: Initial version of persistent memory driver Boaz Harrosh
2015-03-05 20:35 ` Paul Bolle
2015-03-05 23:03 ` Andy Lutomirski
2015-03-09 12:20 ` Boaz Harrosh
2015-03-18 18:06 ` Andy Lutomirski
2015-03-26 4:00 ` Elliott, Robert (Server Storage)
2015-03-26 7:51 ` Boaz Harrosh
2015-03-26 21:31 ` Dave Chinner
2015-03-18 17:43 ` Ross Zwisler
2015-03-19 9:24 ` Boaz Harrosh
2015-03-20 0:11 ` Dan Williams
2015-03-05 11:55 ` [PATCH 2/8] pmem: KISS, remove register_blkdev Boaz Harrosh
2015-03-05 11:56 ` [PATCH 3/8] pmem: Add support for rw_page() Boaz Harrosh
2015-03-05 11:57 ` [PATCH 4/8] pmem: Add support for direct_access() Boaz Harrosh
2015-03-05 11:58 ` [PATCH 5/8] mm: Let sparse_{add,remove}_one_section receive a node_id Boaz Harrosh
2015-03-06 18:43 ` Ross Zwisler
2015-03-05 11:59 ` [PATCH 6/8] mm: New add_persistent_memory/remove_persistent_memory Boaz Harrosh
2015-03-05 11:59 ` [PATCH 7/8] pmem: Add support for page structs Boaz Harrosh
2015-03-23 20:59 ` Dan Williams
2015-03-05 12:01 ` [PATCH 8/8] OUT-OF-TREE: pmem: Allow request_mem to fail (BLK_DEV_PMEM_IGNORE_REQUEST_MEM_RET) Boaz Harrosh
2015-03-06 18:37 ` [RFC 0/8] pmem: Submission of the Persistent memory block device Ross Zwisler
2015-03-07 1:39 ` Christoph Hellwig
2015-03-09 12:41 ` Boaz Harrosh
2015-03-05 22:48 ` [PATCH 0/3 v5] e820: Fix handling of NvDIMM chips H. Peter Anvin
2015-03-05 23:06 ` Andy Lutomirski
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