Re: [RFC PATCH] dax: add badblocks check to Device DAX

From	"Kani, Toshimitsu" <toshi.kani@hpe.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH] dax: add badblocks check to Device DAX
Date	2017-05-04 01:30 +0200
Message-ID	<tDbSx-3JV-5@gated-at.bofh.it> (permalink)
References	(4 earlier) <tD7vA-Hg-31@gated-at.bofh.it> <tDajM-2yX-19@gated-at.bofh.it> <tDbfP-3bL-1@gated-at.bofh.it> <tDbpw-3fo-7@gated-at.bofh.it> <tDbzb-3Ao-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

On Wed, 2017-05-03 at 16:08 -0700, Dan Williams wrote:
> On Wed, May 3, 2017 at 3:51 PM, Dan Williams <dan.j.williams@intel.co
> m> wrote:
> > On Wed, May 3, 2017 at 3:41 PM, Kani, Toshimitsu <toshi.kani@hpe.co
> > m> wrote:
> > > On Wed, 2017-05-03 at 14:48 -0700, Dan Williams wrote:
 :
> > 
> > I believe we already have all the data needed to calculate the data
> > offset. Given the following sysfs path:
> > 
> >     /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/region1
> > /dax1.1/dax/dax1.0
> > 
> > ...we can find the associated namespace device from that dax1.1.
> > From
> > there we have the base address of the namespace and the size
> > device-dax instance.
> > 
> >     device_dax_data_offset == namespace_base + namespace_size -
> > device_dax_size
> 
> Dave reminds me that we do have the data offset of the device-dax
> instance at the libnvdimm level:
> 
>     /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/region1/d
> ax1.1/resource
> 
> ...in this example, which maps to ndctl_dax_get_resource().

Thanks for the info!  I noticed why I did not catch this info before.

# ll /dev/dax*
crw------- 1 root root 251, 3 May  3 04:28 /dev/dax0.0

# pwd
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/region0/dax0.0

# grep . *
align:2097152
devtype:nd_dax
modalias:nd:t7
mode:none
numa_node:0
grep: power: Is a directory
grep: resource: No such device or address
grep: size: No such device or address
grep: subsystem: Is a directory
uevent:DEVTYPE=nd_dax
uevent:MODALIAS=nd:t7

But I noticed that "resource" and "size" that are under
".../region0/dax0.1" work.  Is this intended?

-Toshi

Thread

[RFC PATCH] dax: add badblocks check to Device DAX Toshi Kani <toshi.kani@hpe.com> - 2017-05-03 17:40 +0200
  Re: [RFC PATCH] dax: add badblocks check to Device DAX Dan Williams <dan.j.williams@intel.com> - 2017-05-03 18:00 +0200
    Re: [RFC PATCH] dax: add badblocks check to Device DAX "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-05-03 18:10 +0200
      Re: [RFC PATCH] dax: add badblocks check to Device DAX Dan Williams <dan.j.williams@intel.com> - 2017-05-03 18:40 +0200
        Re: [RFC PATCH] dax: add badblocks check to Device DAX "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-05-03 20:50 +0200
          Re: [RFC PATCH] dax: add badblocks check to Device DAX Dan Williams <dan.j.williams@intel.com> - 2017-05-03 23:50 +0200
            Re: [RFC PATCH] dax: add badblocks check to Device DAX Dave Jiang <dave.jiang@intel.com> - 2017-05-04 00:00 +0200
            Re: [RFC PATCH] dax: add badblocks check to Device DAX "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-05-04 00:50 +0200
              Re: [RFC PATCH] dax: add badblocks check to Device DAX Dan Williams <dan.j.williams@intel.com> - 2017-05-04 01:00 +0200
                Re: [RFC PATCH] dax: add badblocks check to Device DAX Dan Williams <dan.j.williams@intel.com> - 2017-05-04 01:10 +0200
                Re: [RFC PATCH] dax: add badblocks check to Device DAX "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-05-04 01:30 +0200
                Re: [RFC PATCH] dax: add badblocks check to Device DAX "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-05-04 01:40 +0200
                Re: [RFC PATCH] dax: add badblocks check to Device DAX Dan Williams <dan.j.williams@intel.com> - 2017-05-04 04:10 +0200
                Re: [RFC PATCH] dax: add badblocks check to Device DAX "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2017-05-04 16:20 +0200

csiph-web