ll /sys/devices/LNXSYSTM:00/device:00/ACPI0012:00/ndbus0/region1/pfn1.1/block/pmem1/ total 0 -r--r--r-- 1 root root 4096 Apr 19 09:38 alignment_offset -rw-r--r-- 1 root root 4096 Apr 19 09:38 badblocks lrwxrwxrwx 1 root root 0 Apr 19 09:38 bdi -> ../../../../../../../../virtual/bdi/259:3 -r--r--r-- 1 root root 4096 Apr 19 09:38 capability drwxr-xr-x 2 root root 0 Apr 19 09:38 dax -r--r--r-- 1 root root 4096 Apr 19 09:38 dev lrwxrwxrwx 1 root root 0 Apr 19 09:38 device -> ../../../pfn1.1 -r--r--r-- 1 root root 4096 Apr 19 09:38 discard_alignment -r--r--r-- 1 root root 4096 Apr 19 09:38 ext_range drwxr-xr-x 2 root root 0 Apr 19 09:38 holders -r--r--r-- 1 root root 4096 Apr 19 09:38 inflight drwxr-xr-x 2 root root 0 Apr 19 09:38 power drwxr-xr-x 2 root root 0 Apr 19 09:38 queue -r--r--r-- 1 root root 4096 Apr 19 09:38 range -r--r--r-- 1 root root 4096 Apr 19 09:38 removable -r--r--r-- 1 root root 4096 Apr 19 09:38 ro -r--r--r-- 1 root root 4096 Apr 19 09:38 size drwxr-xr-x 2 root root 0 Apr 19 09:38 slaves -r--r--r-- 1 root root 4096 Apr 19 09:38 stat lrwxrwxrwx 1 root root 0 Apr 19 09:38 subsystem -> ../../../../../../../../../class/block drwxr-xr-x 2 root root 0 Apr 19 09:38 trace -rw-r--r-- 1 root root 4096 Apr 19 09:38 uevent
On Wed, Apr 24, 2019 at 11:53 AM Greg KH <[email protected]> wrote: > On Wed, Apr 24, 2019 at 10:10:08AM -0700, Sayeed hyder wrote: > > Forgot to hit "reply all" > > > > On Wed, Apr 24, 2019 at 9:52 AM Sayeed hyder <[email protected]> wrote: > > > > > Hi Greg, > > > > > > Sure, this is what I get if I use the syspath from > > > udev_device_get_syspath. As you can see, it is showing a symlink to a > > > device, and there is no driver. If it helps, it is a DAX mounted > persistent > > > memory device. > > > > > > [image: image.png] > > Sorry, can't see images from a text email client :( > > Anyway, if this is a DAX device, are you _SURE_ you are dealing with a > real device that is controlled by a driver, and not just a class device? > Class devices do not have drivers. How is the DAX device being exposed > to userspace? > > Can you provide a text version of your image? It's just sysfs, which is > text... > > thanks, > > greg k-h >
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