linux-kernel - Re: [Linux-nvdimm] [PATCH v2] pmem: Initial version of persistent memory driver

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Date:	Fri, 19 Sep 2014 09:27:36 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Jeff Moyer <jmoyer@...hat.com>, Boaz Harrosh <boaz@...xistor.com>
Cc:	Boaz Harrosh <openosd@...il.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Jens Axboe <axboe@...nel.dk>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-nvdimm@...1.01.org
Subject: Re: [Linux-nvdimm] [PATCH v2] pmem: Initial version of persistent
 memory driver

On Tue, Sep 16, 2014 at 6:54 AM, Jeff Moyer <jmoyer@...hat.com> wrote:
> Boaz Harrosh <boaz@...xistor.com> writes:
>
>> On 09/11/2014 07:31 PM, Dan Williams wrote:
>> <>
>>>
>>> The point I am getting at is not requiring a priori knowledge of the
>>> physical memory map of a system.  Rather, place holder variables to
>>> enable simple dynamic discovery.
>>>
>>
>> "simple dynamic discovery" does not yet exist and when the DDR4 NvDIMM
>> will be released then we still have those DDR3 out there which will
>> not work with the new discovery, which I need to support as well.
>
> Boaz,
>
> Are you telling me that vendors are shipping parts that present
> themselves as E820_RAM, and that you have to manually block off the
> addresses from the kernel using the kernel command line?  If that is
> true, then that is just insane and unsupportable.  All the hardware I
> have access to:
> 1) does not present itself as normal memory and
> 2) provides some means for discovering its address and size

Jeff,

Yes, agree.

Boaz,

The UEFI organization is in the process of defining a generic
specification for platform non-volatile memory resources.  Let's wait
until that is publicly available before adding any new device
discovery capabilities to pmem.
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