From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A1D5C433DF for ; Tue, 7 Jul 2020 02:14:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE9E82070C for ; Tue, 7 Jul 2020 02:14:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726591AbgGGCOx (ORCPT ); Mon, 6 Jul 2020 22:14:53 -0400 Received: from mga11.intel.com ([192.55.52.93]:31473 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726434AbgGGCOx (ORCPT ); Mon, 6 Jul 2020 22:14:53 -0400 IronPort-SDR: v5qjLqyOUK8njnrYW46G5ZD9XYzeX04Vw4XiH3/UiEhgHy0brX7N5WBi0GsxLDpffJBL3TCX3p Dkp2TDh0qWAQ== X-IronPort-AV: E=McAfee;i="6000,8403,9674"; a="145628561" X-IronPort-AV: E=Sophos;i="5.75,321,1589266800"; d="scan'208";a="145628561" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jul 2020 19:14:49 -0700 IronPort-SDR: aM/DQzSNXqXoRKoo+f4FUPP8V+ChlSee823io9y6Qo1rVJETAQmGsTUduAc04a83jMqLOfZryy ZkPdDP7hyB/w== X-IronPort-AV: E=Sophos;i="5.75,321,1589266800"; d="scan'208";a="427299087" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.16]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jul 2020 19:14:49 -0700 Subject: [PATCH v2 00/12] ACPI/NVDIMM: Runtime Firmware Activation From: Dan Williams To: linux-nvdimm@lists.01.org Cc: Ira Weiny , Doug Ledford , Dave Jiang , "Rafael J. Wysocki" , Vishal Verma , Andy Shevchenko , Jonathan Corbet , Jason Gunthorpe , Greg Kroah-Hartman , Len Brown , Len Brown , "Rafael J. Wysocki" , Pavel Machek , stable@vger.kernel.org, "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 06 Jul 2020 18:58:33 -0700 Message-ID: <159408711335.2385045.2567600405906448375.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Changes since v1 [1]: - Move the syscore callback from 'suspend' path to the 'hibernate' path (Rafael) - Add a new PM debug test mode, 'mem-quiet' to disable some unnecessary hibernation steps (memory image preparation) and debug sleeps when the hibernation code is just being used to quiet the system for firmware activation. (Rafael) - Greg already applied "driver-core: Introduce DEVICE_ATTR_ADMIN_{RO,RW}" to driver-core-next, so I'll need to duplicate that commit in nvdimm.git, or work out a common branch baseline with Greg for this topic and driver-core-next to share. [1]: http://lore.kernel.org/r/159312902033.1850128.1712559453279208264.stgit@dwillia2-desk3.amr.corp.intel.com --- Quoting the documentation: 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. [1]: https://docs.pmem.io/persistent-memory/ The approach taken is to abstract the Intel platform specific mechanism behind a libnvdimm-generic sysfs interface. The interface could support runtime-firmware-activation on another architecture without need to change userspace tooling. The ACPI NFIT implementation involves a set of device-specific-methods (DSMs) to 'arm' individual devices for activation and bus-level 'trigger' method to execute the activation. Informational / enumeration methods are also provided at the bus and device level. One complicating aspect of the memory device firmware activation is that the memory controller may need to be quiesced, no memory cycles, during the activation. While the platform has mechanisms to support holding off in-flight DMA during the activation, the device response to that delay is potentially undefined. The platform may reject a runtime firmware update if, for example a PCI-E device does not support its completion timeout value being increased to meet the activation time. Outside of device timeouts the quiesce period may also violate application timeouts. Given the above device and application timeout considerations the implementation defaults to hooking into the hibernation path to trigger the activation, i.e. that a hibernate-resume cycle (at least up to the syscore mem-quiet point) is required. That default policy ensures that the system is in a quiescent state before ceasing memory controller responses for the activate. However, if desired, runtime activation without the hibernate freeze can be forced as an override. The ndctl utility grows the following extensions / commands to drive this mechanism: 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 --- Dan Williams (12): libnvdimm: Validate command family indices ACPI: NFIT: Move bus_dsm_mask out of generic nvdimm_bus_descriptor ACPI: NFIT: Define runtime firmware activation commands tools/testing/nvdimm: Cleanup dimm index passing tools/testing/nvdimm: Add command debug messages tools/testing/nvdimm: Prepare nfit_ctl_test() for ND_CMD_CALL emulation tools/testing/nvdimm: Emulate firmware activation commands driver-core: Introduce DEVICE_ATTR_ADMIN_{RO,RW} libnvdimm: Convert to DEVICE_ATTR_ADMIN_RO() libnvdimm: Add runtime firmware activation sysfs interface PM, libnvdimm: Add 'mem-quiet' state and callback for firmware activation ACPI: NFIT: Add runtime firmware activate support Documentation/ABI/testing/sysfs-bus-nfit | 35 ++ Documentation/ABI/testing/sysfs-bus-nvdimm | 2 .../driver-api/nvdimm/firmware-activate.rst | 74 +++ drivers/acpi/nfit/core.c | 146 +++++-- drivers/acpi/nfit/intel.c | 426 ++++++++++++++++++++ drivers/acpi/nfit/intel.h | 61 +++ drivers/acpi/nfit/nfit.h | 39 ++ drivers/base/syscore.c | 21 + drivers/nvdimm/bus.c | 46 ++ drivers/nvdimm/core.c | 103 +++++ drivers/nvdimm/dimm_devs.c | 99 +++++ drivers/nvdimm/namespace_devs.c | 2 drivers/nvdimm/nd-core.h | 1 drivers/nvdimm/pfn_devs.c | 2 drivers/nvdimm/region_devs.c | 2 include/linux/device.h | 4 include/linux/libnvdimm.h | 53 ++ include/linux/syscore_ops.h | 2 include/linux/sysfs.h | 7 include/uapi/linux/ndctl.h | 5 kernel/power/hibernate.c | 17 + kernel/power/main.c | 1 kernel/power/power.h | 7 kernel/power/snapshot.c | 13 + kernel/power/suspend.c | 12 + tools/testing/nvdimm/test/nfit.c | 367 ++++++++++++++--- 26 files changed, 1427 insertions(+), 120 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-nvdimm create mode 100644 Documentation/driver-api/nvdimm/firmware-activate.rst