On Wed, 2017-05-03 at 17:25 -0600, Toshi Kani wrote: > 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/regio > > > n1 > > > /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?
Here is an output from dax0.1 (I removed the size value). Noticed that mode is different. # pwd /sys/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0012:00/ndbus0/region0/dax0.1 # grep . * align:2097152 grep: dax: Is a directory grep: dax_region: Is a directory devtype:nd_dax grep: driver: Is a directory modalias:nd:t7 mode:pmem namespace:namespace0.0 numa_node:0 grep: power: Is a directory resource:0x250200000 size:(size value) grep: subsystem: Is a directory uevent:DEVTYPE=nd_dax uevent:DRIVER=dax_pmem uevent:MODALIAS=nd:t7 uuid:8c71811f-260d-4788-8487-db88d829d393 Thanks, -Toshi
