Some persistent memory devices run a firmware locally on the device /
"DIMM" to perform tasks like media management, capacity provisioning,
and health monitoring. The process of updating that firmware typically
involves a reboot because it has implications for in-flight memory
transactions. However, reboots are disruptive and at least the Intel
persistent memory platform implementation, described by the Intel ACPI
DSM specification [1], has added support for activating firmware at
runtime.
As mentioned in the kernel patches adding support for firmware-activate
[2], ndctl is extended with the following functionality:
1/ The existing update-firmware command will 'arm' devices where the
firmware image is staged by default.
ndctl update-firmware all -f firmware_image.bin
2/ The existing ability to enumerate firmware-update capabilities now
includes firmware activate capabilities at the 'bus' and 'dimm/device'
level:
ndctl list -BDF -b nfit_test.0
[
{
"provider":"nfit_test.0",
"dev":"ndbus2",
"scrub_state":"idle",
"firmware":{
"activate_method":"suspend",
"activate_state":"idle"
},
"dimms":[
{
"dev":"nmem1",
"id":"cdab-0a-07e0-ffffffff",
"handle":0,
"phys_id":0,
"security":"disabled",
"firmware":{
"current_version":0,
"can_update":true
}
},
...
3/ When the system can support activation without quiesce, or when the
hibernate-resume requirement is going to be suppressed, the new
activate-firmware command wraps that functionality:
ndctl activate-firmware nfit_test.0 --force
Otherwise, if activate_method is "suspend" then the activation can be
triggered by the mem-quiet hibernate debug state, or a full hibernate
resume:
echo mem-quiet > /sys/power/pm_debug
echo disk > /sys/power/state
In addition to firmware activate support this patch-set also includes
some miscellaneous test updates and build fixes.
[1]: https://pmem.io/documents/IntelOptanePMem_DSM_Interface-V2.0.pdf
[2]:
http://lore.kernel.org/r/159408711335.2385045.2567600405906448375.st...@dwillia2-desk3.amr.corp.intel.com
---
Dan Williams (16):
ndctl/build: Fix zero-length array warnings
ndctl/dimm: Fix chatty status messages
ndctl/list: Indicate firmware update capability
ndctl/dimm: Detect firmware-update vs ARS conflict
ndctl/dimm: Improve firmware-update failure message
ndctl/dimm: Prepare to emit dimm json object after firmware update
ndctl/dimm: Emit dimm firmware details after update
ndctl/list: Add firmware activation enumeration
ndctl/dimm: Auto-arm firmware activation
ndctl/bus: Add 'activate-firmware' command
ndctl/docs: Update copyright date
ndctl/test: Test firmware-activation interface
test: Validate strict iomem protections of pmem
ndctl: Refactor nfit.h to acpi.h
daxctl: Add 'split-acpi' command to generate custom ACPI tables
test/ndctl: mremap pmd confusion
Documentation/copyright.txt | 2
Documentation/ndctl/Makefile.am | 3
Documentation/ndctl/ndctl-activate-firmware.txt | 130 +++
Documentation/ndctl/ndctl-list.txt | 39 +
Documentation/ndctl/ndctl-update-firmware.txt | 40 +
acpi.h | 236 ++++++
daxctl/Makefile.am | 1
daxctl/acpi.c | 870 +++++++++++++++++++++++
daxctl/builtin.h | 1
daxctl/daxctl.c | 1
ndctl/Makefile.am | 1
ndctl/action.h | 1
ndctl/builtin.h | 1
ndctl/bus.c | 173 ++++-
ndctl/create-nfit.c | 66 --
ndctl/dimm.c | 278 +++++--
ndctl/firmware-update.h | 1
ndctl/lib/hpe1.h | 4
ndctl/lib/libndctl.c | 258 +++++++
ndctl/lib/libndctl.sym | 14
ndctl/lib/msft.h | 2
ndctl/lib/private.h | 3
ndctl/libndctl.h | 35 +
ndctl/list.c | 13
ndctl/ndctl.c | 1
ndctl/ndctl.h | 2
ndctl/util/json-firmware.c | 80 --
nfit.h | 65 --
test.h | 2
test/Makefile.am | 9
test/dax-dev.c | 4
test/dax-pmd.c | 99 +++
test/device-dax.c | 7
test/firmware-update.sh | 50 +
test/revoke-devmem.c | 143 ++++
util/json.c | 181 +++++
util/json.h | 20 -
37 files changed, 2509 insertions(+), 327 deletions(-)
create mode 100644 Documentation/ndctl/ndctl-activate-firmware.txt
create mode 100644 acpi.h
create mode 100644 daxctl/acpi.c
delete mode 100644 ndctl/util/json-firmware.c
delete mode 100644 nfit.h
create mode 100644 test/revoke-devmem.c
base-commit: c7767834871f7ce50a2abe1da946e9e16fb08eda
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