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 _IOC_NR ND_CMD_PASSTHRU == "100" is added for the pass thru call. The new data structure nd_passthru_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 nd_passthru_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 call _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 4.3 tailored to the Intel Example DSM. New functions acpi_nfit_ctl_passthru and __nd_ioctl_passthru were created to supply the pass thru interface. These changes are based upon the 4.3 kernel. Changes in version 2: --------------------- 1. Cleanup access mode check in nd_ioctl and nvdimm_ioctl. 2. Change name of ndn_pkg to nd_passthru_pkg 3. Adjust sizes in nd_passthru_pkg. DSM intergers are 64 bit. 4. No new ioctl type, instead tunnel into the existing number space. 5. Push down one function level where determine ioctl cmd type. 6. re-work diagnostic print/dump message in pass-thru functions. Jerry Hoemann (3): nvdimm: Clean-up access mode check. nvdimm: Add wrapper for IOCTL pass thru nvdimm: Add IOCTL pass thru functions drivers/acpi/nfit.c | 93 ++++++++++++++++++++++++++++++++++++++++- drivers/nvdimm/bus.c | 101 +++++++++++++++++++++++++++++++++++++++++---- include/uapi/linux/ndctl.h | 16 +++++++ 3 files changed, 202 insertions(+), 8 deletions(-) -- 1.7.11.3 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
