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linux/drivers/acpi
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David E. Box df4f9bc4fb nvme-pci: add support for ACPI StorageD3Enable property 
This patch implements a solution for a BIOS hack used on some currently
shipping Intel systems to change driver power management policy for PCIe
NVMe drives. Some newer Intel platforms, like some Comet Lake systems,
require that PCIe devices use D3 when doing suspend-to-idle in order to
allow the platform to realize maximum power savings. This is particularly
needed to support ATX power supply shutdown on desktop systems. In order to
ensure this happens for root ports with storage devices, Microsoft
apparently created this ACPI _DSD property as a way to influence their
driver policy. To my knowledge this property has not been discussed with
the NVME specification body.

Though the solution is not ideal, it addresses a problem that also affects
Linux since the NVMe driver's default policy of using NVMe APST during
suspend-to-idle prevents the PCI root port from going to D3 and leads to
higher power consumption for these platforms. The power consumption
difference may be negligible on laptop systems, but many watts on desktop
systems when the ATX power supply is blocked from powering down.

The patch creates a new nvme_acpi_storage_d3 function to check for the
StorageD3Enable property during probe and enables D3 as a quirk if set.  It
also provides a 'noacpi' module parameter to allow skipping the quirk if
needed.

Tested with:
 - PM961 NVMe SED Samsung 512GB
 - INTEL SSDPEKKF512G8

Link: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-management-for-storage-hardware-devices-intro
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2020-07-29 07:45:19 +02:00
..
acpica ACPICA: iASL: add new OperationRegion subtype keyword PlatformRtMechanism 2020-06-05 13:34:23 +02:00
apei ACPI updates for 5.8-rc1 2020-06-02 13:25:52 -07:00
arm64 ACPI/IORT: Remove the unused __get_pci_rid() 2020-05-26 20:43:33 +01:00
dptf ACPI: DPTF: Add battery participant for TigerLake 2020-06-29 14:00:57 +02:00
nfit libnvdimm for 5.8 2020-06-13 13:04:36 -07:00
numa virtio-mem: Allow to specify an ACPI PXM as nid 2020-06-04 15:36:52 -04:00
pmic ACPI / PMIC: Add i2c address for thermal control 2020-05-18 12:57:24 +02:00
x86 ACPI: Convert to new X86 CPU match macros 2020-03-24 21:30:50 +01:00
ac.c ACPI / AC: Cleanup DMI quirk table 2020-03-04 10:32:50 +01:00
acpi_adxl.c
acpi_amba.c Merge 5.2-rc6 into char-misc-next 2019-06-23 09:23:33 +02:00
acpi_apd.c ACPI / APD: Add clock frequency for Hisilicon Hip08-Lite I2C controller 2020-02-03 12:03:18 +01:00
acpi_cmos_rtc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
acpi_configfs.c ACPI: configfs: Disallow loading ACPI tables when locked down 2020-06-22 16:41:27 +02:00
acpi_dbg.c ACPI: debug: Make two functions static 2020-05-09 11:33:07 +02:00
acpi_extlog.c EDAC: Drop the EDAC report status checks 2020-04-14 16:01:01 +02:00
acpi_ipmi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
acpi_lpat.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
acpi_lpit.c ACPI: LPIT: Put the low power idle table after using it 2020-05-09 11:29:16 +02:00
acpi_lpss.c PM: sleep: core: Rename dev_pm_smart_suspend_and_suspended() 2020-04-24 21:32:41 +02:00
acpi_memhotplug.c mm/memory_hotplug: rename walk_memory_range() and pass start+size instead of pfns 2019-07-18 17:08:06 -07:00
acpi_pad.c ACPI, x86: Add Zhaoxin processors support for NONSTOP TSC 2019-06-22 11:45:57 +02:00
acpi_platform.c ACPI: platform: Unregister stale platform devices 2019-10-17 23:48:39 +02:00
acpi_pnp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
acpi_processor.c ACPI: processor: Export acpi_processor_evaluate_cst() 2019-12-27 11:02:07 +01:00
acpi_tad.c PM: sleep: core: Rename DPM_FLAG_LEAVE_SUSPENDED 2020-04-24 21:34:22 +02:00
acpi_video.c ACPI: video: remove redundant assignments to variable result 2020-03-04 10:43:04 +01:00
acpi_watchdog.c ACPI: watchdog: Put the watchdog action table after parsing 2020-05-09 11:29:17 +02:00
battery.c ACPI / battery: Cleanup Lenovo Ideapad Miix 320 DMI table entry 2020-03-04 10:32:50 +01:00
bgrt.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
blacklist.c ACPI: blacklist: fix clang warning for unused DMI table 2019-07-11 22:45:00 +02:00
bus.c ACPI: bus: Fix NULL pointer check in acpi_bus_get_private_data() 2019-11-29 11:42:10 +01:00
button.c ACPI: Delete unused proc filename macros 2020-05-14 13:49:33 +02:00
cm_sbs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
container.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
cppc_acpi.c ACPI: CPPC: Fix reference count leak in acpi_cppc_processor_probe() 2020-05-28 13:47:53 +02:00
custom_method.c Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-09-28 08:14:15 -07:00
debugfs.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
device_pm.c Merge branches 'pm-cpufreq' and 'pm-acpi' 2020-06-10 17:10:40 +02:00
device_sysfs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
dock.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
ec.c ACPI updates for 5.8-rc1 2020-06-02 13:25:52 -07:00
ec_sys.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482 2019-06-19 17:09:52 +02:00
event.c ACPI: event: replace strcpy() by strscpy() 2019-04-23 10:54:26 +02:00
evged.c ACPI: GED: use correct trigger type field in _Exx / _Lxx handling 2020-05-27 17:51:49 +02:00
fan.c ACPI: fan: Fix Tiger Lake ACPI device ID 2020-06-30 19:32:45 +02:00
glue.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
hed.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
internal.h ACPI: EC: PM: Avoid premature returns from acpi_s2idle_wake() 2020-05-11 10:11:38 +02:00
ioapic.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
irq.c Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-07-08 11:01:13 -07:00
Kconfig ACPI: Add new tiny-power-button driver to directly signal init 2020-02-13 23:36:23 +01:00
Makefile ACPI: Add new tiny-power-button driver to directly signal init 2020-02-13 23:36:23 +01:00
nvs.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
osi.c ACPI: OSI: Shoot duplicate word 2019-11-13 11:12:08 +01:00
osl.c ACPI: OSL: Add missing __acquires/__releases annotations 2020-03-04 10:40:48 +01:00
pci_irq.c ACPI / PCI: fix acpi_pci_irq_enable() memory leak 2019-09-03 09:41:25 +02:00
pci_link.c ACPI: Delete unused proc filename macros 2020-05-14 13:49:33 +02:00
pci_mcfg.c PCI: Constify struct pci_ecam_ops 2020-05-01 16:28:59 +01:00
pci_root.c Merge branch 'pci/misc' 2020-06-04 12:59:11 -05:00
pci_slot.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 491 2019-06-19 17:09:52 +02:00
power.c ACPI: Delete unused proc filename macros 2020-05-14 13:49:33 +02:00
pptt.c ACPI: PPTT: Consistently use unsigned int as parameter type 2020-01-07 11:46:36 +01:00
proc.c ACPI: list_for_each_safe() -> list_for_each_entry_safe() 2020-03-04 10:48:00 +01:00
processor_core.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
processor_driver.c cpufreq: Use per-policy frequency QoS 2019-10-21 02:05:21 +02:00
processor_idle.c ACPI: processor: idle: Allow probing on platforms with one ACPI C-state 2020-04-27 10:32:44 +02:00
processor_pdc.c
processor_perflib.c ACPI: processor: Add QoS requests for all CPUs 2019-10-25 11:33:48 +02:00
processor_thermal.c ACPI: processor: Add QoS requests for all CPUs 2019-10-25 11:33:48 +02:00
processor_throttling.c x86: ACPI: fix CPU hotplug deadlock 2020-04-04 16:28:24 +02:00
property.c nvme-pci: add support for ACPI StorageD3Enable property 2020-07-29 07:45:19 +02:00
reboot.c ACPI: Allow CONFIG_PCI to be unset for reboot 2018-12-20 10:19:49 +01:00
resource.c acpi: Use pr_warn instead of pr_warning 2019-10-18 15:00:19 +02:00
sbs.c ACPI: Delete unused proc filename macros 2020-05-14 13:49:33 +02:00
sbshc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 372 2019-06-05 17:37:10 +02:00
sbshc.h ACPI: SBS: remove unused const variable 'SMBUS_PEC' 2019-08-23 12:55:09 +02:00
scan.c More power management updates for 5.8-rc1 2020-06-10 14:04:39 -07:00
sleep.c ACPI updates for 5.8-rc1 2020-06-02 13:25:52 -07:00
sleep.h ACPI: PM: Add acpi_[un]register_wakeup_handler() 2020-04-04 19:45:18 +02:00
spcr.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
sysfs.c ACPI: sysfs: Fix pm_profile_attr type 2020-06-22 17:13:38 +02:00
tables.c ACPICA: Add NHLT table signature 2020-03-30 14:52:33 +02:00
thermal.c ACPI: thermal: switch to use <linux/units.h> helpers 2020-01-31 10:30:39 -08:00
tiny-power-button.c ACPI: Add new tiny-power-button driver to directly signal init 2020-02-13 23:36:23 +01:00
utils.c ACPI: utils: Add acpi_evaluate_reg() helper 2020-05-09 11:40:25 +02:00
video_detect.c ACPI: video: Use native backlight on Acer TravelMate 5735Z 2020-05-25 11:58:51 +02:00
wakeup.c ACPI: PM: Add acpi_[un]register_wakeup_handler() 2020-04-04 19:45:18 +02:00