linux-stable/drivers/acpi
Linus Torvalds f67e3fb489 device-dax for 5.1
* Replace the /sys/class/dax device model with /sys/bus/dax, and include
   a compat driver so distributions can opt-in to the new ABI.
 
 * Allow for an alternative driver for the device-dax address-range
 
 * Introduce the 'kmem' driver to hotplug / assign a device-dax
   address-range to the core-mm.
 
 * Arrange for the device-dax target-node to be onlined so that the newly
   added memory range can be uniquely referenced by numa apis.
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Merge tag 'devdax-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull device-dax updates from Dan Williams:
 "New device-dax infrastructure to allow persistent memory and other
  "reserved" / performance differentiated memories, to be assigned to
  the core-mm as "System RAM".

  Some users want to use persistent memory as additional volatile
  memory. They are willing to cope with potential performance
  differences, for example between DRAM and 3D Xpoint, and want to use
  typical Linux memory management apis rather than a userspace memory
  allocator layered over an mmap() of a dax file. The administration
  model is to decide how much Persistent Memory (pmem) to use as System
  RAM, create a device-dax-mode namespace of that size, and then assign
  it to the core-mm. The rationale for device-dax is that it is a
  generic memory-mapping driver that can be layered over any "special
  purpose" memory, not just pmem. On subsequent boots udev rules can be
  used to restore the memory assignment.

  One implication of using pmem as RAM is that mlock() no longer keeps
  data off persistent media. For this reason it is recommended to enable
  NVDIMM Security (previously merged for 5.0) to encrypt pmem contents
  at rest. We considered making this recommendation an actively enforced
  requirement, but in the end decided to leave it as a distribution /
  administrator policy to allow for emulation and test environments that
  lack security capable NVDIMMs.

  Summary:

   - Replace the /sys/class/dax device model with /sys/bus/dax, and
     include a compat driver so distributions can opt-in to the new ABI.

   - Allow for an alternative driver for the device-dax address-range

   - Introduce the 'kmem' driver to hotplug / assign a device-dax
     address-range to the core-mm.

   - Arrange for the device-dax target-node to be onlined so that the
     newly added memory range can be uniquely referenced by numa apis"

NOTE! I'm not entirely happy with the whole "PMEM as RAM" model because
we currently have special - and very annoying rules in the kernel about
accessing PMEM only with the "MC safe" accessors, because machine checks
inside the regular repeat string copy functions can be fatal in some
(not described) circumstances.

And apparently the PMEM modules can cause that a lot more than regular
RAM.  The argument is that this happens because PMEM doesn't necessarily
get scrubbed at boot like RAM does, but that is planned to be added for
the user space tooling.

Quoting Dan from another email:
 "The exposure can be reduced in the volatile-RAM case by scanning for
  and clearing errors before it is onlined as RAM. The userspace tooling
  for that can be in place before v5.1-final. There's also runtime
  notifications of errors via acpi_nfit_uc_error_notify() from
  background scrubbers on the DIMM devices. With that mechanism the
  kernel could proactively clear newly discovered poison in the volatile
  case, but that would be additional development more suitable for v5.2.

  I understand the concern, and the need to highlight this issue by
  tapping the brakes on feature development, but I don't see PMEM as RAM
  making the situation worse when the exposure is also there via DAX in
  the PMEM case. Volatile-RAM is arguably a safer use case since it's
  possible to repair pages where the persistent case needs active
  application coordination"

* tag 'devdax-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  device-dax: "Hotplug" persistent memory for use like normal RAM
  mm/resource: Let walk_system_ram_range() search child resources
  mm/memory-hotplug: Allow memory resources to be children
  mm/resource: Move HMM pr_debug() deeper into resource code
  mm/resource: Return real error codes from walk failures
  device-dax: Add a 'modalias' attribute to DAX 'bus' devices
  device-dax: Add a 'target_node' attribute
  device-dax: Auto-bind device after successful new_id
  acpi/nfit, device-dax: Identify differentiated memory with a unique numa-node
  device-dax: Add /sys/class/dax backwards compatibility
  device-dax: Add support for a dax override driver
  device-dax: Move resource pinning+mapping into the common driver
  device-dax: Introduce bus + driver model
  device-dax: Start defining a dax bus model
  device-dax: Remove multi-resource infrastructure
  device-dax: Kill dax_region base
  device-dax: Kill dax_region ida
2019-03-16 13:05:32 -07:00
..
acpica ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
apei Merge branch 'acpi-apei' 2019-03-04 11:16:35 +01:00
arm64 ACPI/IORT: Fix rc_dma_get_range() 2019-01-11 10:02:59 +00:00
dptf ACPI / DPTF: remove header search path to the parent directory 2019-01-29 11:04:15 +01:00
nfit device-dax for 5.1 2019-03-16 13:05:32 -07:00
pmic Linux 5.0-rc7 2019-02-18 13:27:15 +10:00
x86 ACPI / x86: Make PWM2 device always present at Lenovo Yoga Book 2019-02-15 00:19:58 +01:00
ac.c ACPI updates for 4.18-rc1 2018-06-05 10:08:27 -07:00
acpi_adxl.c ACPI/ADXL: Add address translation interface using an ACPI DSM 2018-10-16 10:03:00 +02:00
acpi_amba.c
acpi_apd.c ACPI / APD: Add clock frequency for Hisilicon Hip08 SPI controller 2018-12-11 12:16:41 +01:00
acpi_cmos_rtc.c
acpi_configfs.c ACPI / configfs: Mark local data structures static 2019-03-12 09:50:56 +01:00
acpi_dbg.c ACPI: debug: Clean up acpi_aml_init() 2019-01-24 22:46:04 +01:00
acpi_extlog.c
acpi_ipmi.c acpi:ipmi: Convert ipmi_user_t to struct ipmi_user * 2018-09-18 16:15:33 -05:00
acpi_lpat.c
acpi_lpit.c ACPI / PM: LPIT: Register sysfs attributes based on FADT 2018-10-04 09:01:06 +02:00
acpi_lpss.c clk: x86: Move clk-lpss.h to platform_data/x86 2019-02-22 00:14:31 -08:00
acpi_memhotplug.c mm/memory_hotplug: make add_memory() take the device_hotplug_lock 2018-10-31 08:54:17 -07:00
acpi_pad.c ACPI: Add Hygon Dhyana support 2018-09-27 18:29:00 +02:00
acpi_platform.c ACPI / platform: Add SMB0001 HID to forbidden_id_list 2018-11-21 13:30:13 +01:00
acpi_pnp.c
acpi_processor.c ACPI / processor: Fix the return value of acpi_processor_ids_walk() 2018-10-04 08:58:32 +02:00
acpi_tad.c ACPI: TAD: Add low-level support for real time capability 2018-10-18 09:11:53 +02:00
acpi_video.c ACPI / video: Extend chassis-type detection with a "Lunch Box" check 2019-02-13 23:38:34 +01:00
acpi_watchdog.c ACPI / watchdog: Prefer iTCO_wdt always when WDAT table uses RTC SRAM 2018-05-24 10:52:49 +02:00
battery.c ACPI / battery: Do not export energy_full[_design] on devices without full_charge_capacity 2018-08-09 10:49:35 +02:00
bgrt.c
blacklist.c
bus.c ACPI / bus: Respect PRP0001 when retrieving device match data 2019-02-27 10:47:59 +01:00
button.c ACPI / button: fix defined but not used warning 2018-07-09 11:32:44 +02:00
cm_sbs.c
container.c
cppc_acpi.c ACPI / CPPC: Add a helper to get desired performance 2019-02-18 11:27:42 +01:00
custom_method.c ACPI: no need to check return value of debugfs_create functions 2019-01-22 19:45:52 +01:00
debugfs.c
device_pm.c ACPI / PM: Export acpi_device_get_power() for use by modular build drivers 2018-10-12 12:29:48 +02:00
device_sysfs.c ACPI / device_sysfs: Avoid OF modalias creation for removed device 2019-03-12 09:56:18 +01:00
dock.c ACPI: Mark expected switch fall-throughs 2017-11-09 00:55:16 +01:00
ec.c Revert "ACPI / EC: Remove old CLEAR_ON_RESUME quirk" 2019-02-01 12:56:49 +01:00
ec_sys.c ACPI: no need to check return value of debugfs_create functions 2019-01-22 19:45:52 +01:00
event.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
evged.c ACPI: GED: unregister interrupts during shutdown 2017-12-16 03:05:37 +01:00
fan.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
glue.c ACPI / glue: Add acpi_platform_notify() function 2018-11-26 18:19:11 +01:00
hed.c
internal.h ACPI: EC: Clean up probing for early EC 2019-01-29 11:01:30 +01:00
ioapic.c
irq.c ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
Kconfig ACPI / tables: table override from built-in initrd 2019-01-14 11:42:18 +01:00
Makefile ACPI / LPSS: Make PCI dependency explicit 2019-01-15 23:16:18 +01:00
numa.c device-dax for 5.1 2019-03-16 13:05:32 -07:00
nvs.c
osi.c ACPI / OSI: Add OEM _OSI string to enable dGPU direct output 2018-12-18 11:06:05 +01:00
osl.c ACPICA: Remove PCI bits from ACPICA when CONFIG_PCI is unset 2018-12-20 10:19:49 +01:00
pci_irq.c
pci_link.c ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
pci_mcfg.c
pci_root.c PCI/ACPI: Allow _OSC presence to be optional for PCI 2018-09-17 16:32:24 -05:00
pci_slot.c
power.c ACPI: power: Skip duplicate power resource references in _PRx 2019-01-02 11:45:49 +01:00
pptt.c ACPI: tables: Simplify PPTT leaf node detection 2019-03-11 12:14:57 +01:00
proc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
processor_core.c xen/ACPI: don't upload Px/Cx data for disabled processors 2018-08-20 14:46:18 -04:00
processor_driver.c
processor_idle.c ACPI / processor: Set P_LVL{2,3} idle state descriptions 2019-02-18 11:29:13 +01:00
processor_pdc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
processor_perflib.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
processor_thermal.c
processor_throttling.c treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
property.c PCI / ACPI: Identify untrusted PCI devices 2018-12-05 12:01:55 +03:00
reboot.c ACPI: Allow CONFIG_PCI to be unset for reboot 2018-12-20 10:19:49 +01:00
resource.c ACPI/ACPICA: Trivial: fix spelling mistakes and fix whitespace formatting 2019-02-24 21:12:01 +01:00
sbs.c ACPI / SBS: Fix GPE storm on recent MacBookPro's 2018-10-08 08:41:35 +02:00
sbshc.c ACPI / SBS: Fix rare oops when removing modules 2018-10-08 08:41:35 +02:00
sbshc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scan.c ACPI / scan: Create platform device for BSG2150 ACPI nodes 2019-02-05 19:38:20 +02:00
sleep.c ACPI: PM: Loop in full LPS0 mode only 2018-12-18 10:51:16 +01:00
sleep.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spcr.c ACPI: SPCR: Consider baud rate 0 as preconfigured state 2018-11-26 18:29:47 +01:00
sysfs.c ACPI: sysfs: Prevent get_status() from returning acpi_status 2019-03-12 10:34:58 +01:00
tables.c ACPI / tables: table override from built-in initrd 2019-01-14 11:42:18 +01:00
thermal.c
utils.c ACPI: utils: Introduce acpi_dev_get_first_match_name() 2018-01-10 00:41:43 +01:00
video_detect.c ACPI / video: Add quirk to force acpi-video backlight on Samsung 670Z5E 2018-03-20 10:38:17 +01:00
wakeup.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00