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| author |   Dan Williams <dan.j.williams@intel.com> | 2020-07-20 15:08:18 -0700 |
|---|---|---|
| committer |   Vishal Verma <vishal.l.verma@intel.com> | 2020-07-28 19:28:32 -0600 |
| commit | 48001ea50d17f3eb06a552e9ecf21f7fc01b25da (patch) | |
| tree | d62ce17a32b2d86494615af61cdbe90a5df9812d /Documentation/ABI | |
| parent | libnvdimm: Convert to DEVICE_ATTR_ADMIN_RO() (diff) | |
| download | linux-dev-48001ea50d17f3eb06a552e9ecf21f7fc01b25da.tar.xz linux-dev-48001ea50d17f3eb06a552e9ecf21f7fc01b25da.zip | |
PM, libnvdimm: Add runtime firmware activation support
Abstract platform specific mechanics for nvdimm firmware activation
behind a handful of generic ops. At the bus level ->activate_state()
indicates the unified state (idle, busy, armed) of all DIMMs on the bus,
and ->capability() indicates the system state expectations for activate.
At the DIMM level ->activate_state() indicates the per-DIMM state,
->activate_result() indicates the outcome of the last activation
attempt, and ->arm() attempts to transition the DIMM from 'idle' to
'armed'.
A new hibernate_quiet_exec() facility is added to support firmware
activation in an OS defined system quiesce state. It leverages the fact
that the hibernate-freeze state wants to assert that a memory
hibernation snapshot can be taken. This is in contrast to a platform
firmware defined quiesce state that may forcefully quiet the memory
controller independent of whether an individual device-driver properly
supports hibernate-freeze.
The libnvdimm sysfs interface is extended to support detection of a
firmware activate capability. The mechanism supports enumeration and
triggering of firmware activate, optionally in the
hibernate_quiet_exec() context.
[rafael: hibernate_quiet_exec() proposal]
[vishal: fix up sparse warning, grammar in Documentation/]
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Co-developed-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-nvdimm | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-nvdimm b/Documentation/ABI/testing/sysfs-bus-nvdimm new file mode 100644 index 000000000000..d64380262be8 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-nvdimm @@ -0,0 +1,2 @@ +The libnvdimm sub-system implements a common sysfs interface for +platform nvdimm resources. See Documentation/driver-api/nvdimm/. |