On Mon, Nov 16, 2015 at 10:38 AM, Jerry Hoemann <jerry.hoemann@xxxxxxx> wrote: > > 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. Let's not do the _intel vs _passthru split. I want to convert the existing commands over to this new interface and deprecate the old ioctl-command formats. I.e. it isn't the case that this will be a always be a blind "passthru" mechanism, the kernel will need to crack open this payload in some circumstances. -- 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
