Jerry Hoemann of HP (now HPE) posted a message to the linux-nvdimm@lists.01.org, linux-acpi, and linux-kernel lists with new patch to the Linux 4.3 kernel with a new ioctl inteface for NVDIMM DSMs:
nvdimm: Add an IOCTL pass thru for DSM calls
The NVDIMM code in the kernel supports an IOCTL interface to user space based upon the Intel Example DSM:
http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
This interface cannot be used by other NVDIMM DSMs that support incompatible functions. This patch set adds a generic “passthru” IOCTL interface which is not tied to a particular DSM. A new IOCTL type “P” is added for the pass thru call. The new data structure ndn_pkg serves as a wrapper for the passthru calls. This wrapper supplies the data that the kernel needs to make the _DSM call. Unlike the definitions of the _DSM functions themselves, the ndn_pkg provides the calling information (input/output sizes) in an uniform manner making the kernel marshaling of the arguments straight forward. This shifts the marshaling burden from the kernel to the user space application while still permitting the kernel to internally calling _DSM functions. To make the resultant kernel code easier to understand the existing functions acpi_nfit_ctl and __nd_ioctl were renamed to .*_intel to denote calling mechanism as in 4.2 tailored to the Intel Example DSM. New functions acpi_nfit_ctl_passthru and __nd_ioctl_passthru were created to supply the pass thru interface.
drivers/acpi/nfit.c | 91 ++++++++++++++++++++++++++++++++–
drivers/nvdimm/bus.c | 118 +++++++++++++++++++++++++++++++++++++++++—-
drivers/nvdimm/dimm_devs.c | 6 +–
include/linux/libnvdimm.h | 3 +-
include/uapi/linux/ndctl.h | 20 +++++++-
5 files changed, 220 insertions(+), 18 deletions(-)
For more information, see the posting on the linux-nvdimm@lists.01.org mailing list archives.
Firmware Security 