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ACPI: NFIT: Define runtime firmware activation commands

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Platform reboots are expensive. Towards reducing downtime to apply
firmware updates the Intel NVDIMM command definition is growing support
for applying live firmware updates that only require temporarily
suspending memory traffic instead of a full reboot.

Follow-on commits add support for triggering firmware activation, this
patch only defines the commands, adds probe support, and validates that
they are blocked via the ioctl path. The ioctl-path block ensures that
the OS is in charge since these commands have side effects only the OS
can handle. Specifically firmware activation may cause the memory
controller to be quiesced on the order of 100s of milliseconds. In that
case Linux ensure the activation only takes place while the OS is in a
suspend state.

Link: https://pmem.io/documents/IntelOptanePMem_DSM_Interface-V2.0.pdf
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Dan Williams 2020-07-20 15:07:40 -07:00 • committed by Vishal Verma
parent d46e6a2176
commit 6450ddbd5d
4 changed files with 137 additions and 30 deletions
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3
include/uapi/linux/ndctl.h
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@ -248,7 +248,8 @@ struct nd_cmd_pkg {
#define NVDIMM_FAMILY_MAX NVDIMM_FAMILY_PAPR
#define NVDIMM_BUS_FAMILY_NFIT 0
#define NVDIMM_BUS_FAMILY_MAX NVDIMM_BUS_FAMILY_NFIT
#define NVDIMM_BUS_FAMILY_INTEL 1
#define NVDIMM_BUS_FAMILY_MAX NVDIMM_BUS_FAMILY_INTEL
#define ND_IOCTL_CALL _IOWR(ND_IOCTL, ND_CMD_CALL,\
struct nd_cmd_pkg)