Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 1120 insertions, 0 deletions

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
new file mode 100644
index 000000000..4ca667251
--- /dev/null
+++ b/drivers/acpi/sleep.c
@@ -0,0 +1,1120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sleep.c - ACPI sleep support.
+ *
+ * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
+ * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
+ * Copyright (c) 2000-2003 Patrick Mochel
+ * Copyright (c) 2003 Open Source Development Lab
+ */
+
+#define pr_fmt(fmt) "ACPI: PM: " fmt
+
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/dmi.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/suspend.h>
+#include <linux/reboot.h>
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/syscore_ops.h>
+#include <asm/io.h>
+#include <trace/events/power.h>
+
+#include "internal.h"
+#include "sleep.h"
+
+/*
+ * Some HW-full platforms do not have _S5, so they may need
+ * to leverage efi power off for a shutdown.
+ */
+bool acpi_no_s5;
+static u8 sleep_states[ACPI_S_STATE_COUNT];
+
+static void acpi_sleep_tts_switch(u32 acpi_state)
+{
+	acpi_status status;
+
+	status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
+	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+		/*
+		 * OS can't evaluate the _TTS object correctly. Some warning
+		 * message will be printed. But it won't break anything.
+		 */
+		pr_notice("Failure in evaluating _TTS object\n");
+	}
+}
+
+static int tts_notify_reboot(struct notifier_block *this,
+			unsigned long code, void *x)
+{
+	acpi_sleep_tts_switch(ACPI_STATE_S5);
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block tts_notifier = {
+	.notifier_call	= tts_notify_reboot,
+	.next		= NULL,
+	.priority	= 0,
+};
+
+#ifndef acpi_skip_set_wakeup_address
+#define acpi_skip_set_wakeup_address() false
+#endif
+
+static int acpi_sleep_prepare(u32 acpi_state)
+{
+#ifdef CONFIG_ACPI_SLEEP
+	unsigned long acpi_wakeup_address;
+
+	/* do we have a wakeup address for S2 and S3? */
+	if (acpi_state == ACPI_STATE_S3 && !acpi_skip_set_wakeup_address()) {
+		acpi_wakeup_address = acpi_get_wakeup_address();
+		if (!acpi_wakeup_address)
+			return -EFAULT;
+		acpi_set_waking_vector(acpi_wakeup_address);
+
+	}
+#endif
+	pr_info("Preparing to enter system sleep state S%d\n", acpi_state);
+	acpi_enable_wakeup_devices(acpi_state);
+	acpi_enter_sleep_state_prep(acpi_state);
+	return 0;
+}
+
+bool acpi_sleep_state_supported(u8 sleep_state)
+{
+	acpi_status status;
+	u8 type_a, type_b;
+
+	status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
+	return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
+		|| (acpi_gbl_FADT.sleep_control.address
+			&& acpi_gbl_FADT.sleep_status.address));
+}
+
+#ifdef CONFIG_ACPI_SLEEP
+static u32 acpi_target_sleep_state = ACPI_STATE_S0;
+
+u32 acpi_target_system_state(void)
+{
+	return acpi_target_sleep_state;
+}
+EXPORT_SYMBOL_GPL(acpi_target_system_state);
+
+static bool pwr_btn_event_pending;
+
+/*
+ * The ACPI specification wants us to save NVS memory regions during hibernation
+ * and to restore them during the subsequent resume.  Windows does that also for
+ * suspend to RAM.  However, it is known that this mechanism does not work on
+ * all machines, so we allow the user to disable it with the help of the
+ * 'acpi_sleep=nonvs' kernel command line option.
+ */
+static bool nvs_nosave;
+
+void __init acpi_nvs_nosave(void)
+{
+	nvs_nosave = true;
+}
+
+/*
+ * The ACPI specification wants us to save NVS memory regions during hibernation
+ * but says nothing about saving NVS during S3.  Not all versions of Windows
+ * save NVS on S3 suspend either, and it is clear that not all systems need
+ * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
+ * user to disable saving NVS on S3 if their system does not require it, but
+ * continue to save/restore NVS for S4 as specified.
+ */
+static bool nvs_nosave_s3;
+
+void __init acpi_nvs_nosave_s3(void)
+{
+	nvs_nosave_s3 = true;
+}
+
+static int __init init_nvs_save_s3(const struct dmi_system_id *d)
+{
+	nvs_nosave_s3 = false;
+	return 0;
+}
+
+/*
+ * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
+ * user to request that behavior by using the 'acpi_old_suspend_ordering'
+ * kernel command line option that causes the following variable to be set.
+ */
+static bool old_suspend_ordering;
+
+void __init acpi_old_suspend_ordering(void)
+{
+	old_suspend_ordering = true;
+}
+
+static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
+{
+	acpi_old_suspend_ordering();
+	return 0;
+}
+
+static int __init init_nvs_nosave(const struct dmi_system_id *d)
+{
+	acpi_nvs_nosave();
+	return 0;
+}
+
+bool acpi_sleep_default_s3;
+
+static int __init init_default_s3(const struct dmi_system_id *d)
+{
+	acpi_sleep_default_s3 = true;
+	return 0;
+}
+
+static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
+	{
+	.callback = init_old_suspend_ordering,
+	.ident = "Abit KN9 (nForce4 variant)",
+	.matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
+		DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
+		},
+	},
+	{
+	.callback = init_old_suspend_ordering,
+	.ident = "HP xw4600 Workstation",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
+		},
+	},
+	{
+	.callback = init_old_suspend_ordering,
+	.ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
+	.matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
+		DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
+		},
+	},
+	{
+	.callback = init_old_suspend_ordering,
+	.ident = "Panasonic CF51-2L",
+	.matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR,
+				"Matsushita Electric Industrial Co.,Ltd."),
+		DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VGN-FW41E_H",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VGN-FW21E",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VGN-FW21M",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VPCEB17FX",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VGN-SR11M",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Everex StepNote Series",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VPCEB1Z1E",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VGN-NW130D",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VPCCW29FX",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Averatec AV1020-ED2",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
+		},
+	},
+	{
+	.callback = init_old_suspend_ordering,
+	.ident = "Asus A8N-SLI DELUXE",
+	.matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
+		DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
+		},
+	},
+	{
+	.callback = init_old_suspend_ordering,
+	.ident = "Asus A8N-SLI Premium",
+	.matches = {
+		DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
+		DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VGN-SR26GN_P",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VPCEB1S1E",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Sony Vaio VGN-FW520F",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Asus K54C",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
+		},
+	},
+	{
+	.callback = init_nvs_nosave,
+	.ident = "Asus K54HR",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
+		},
+	},
+	{
+	.callback = init_nvs_save_s3,
+	.ident = "Asus 1025C",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
+		},
+	},
+	/*
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
+	 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
+	 * saving during S3.
+	 */
+	{
+	.callback = init_nvs_save_s3,
+	.ident = "Lenovo G50-45",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
+		},
+	},
+	{
+	.callback = init_nvs_save_s3,
+	.ident = "Lenovo G40-45",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
+		},
+	},
+	/*
+	 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
+	 * the Low Power S0 Idle firmware interface (see
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
+	 */
+	{
+	.callback = init_default_s3,
+	.ident = "ThinkPad X1 Tablet(2016)",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+		DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
+		},
+	},
+	/*
+	 * ASUS B1400CEAE hangs on resume from suspend (see
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=215742).
+	 */
+	{
+	.callback = init_default_s3,
+	.ident = "ASUS B1400CEAE",
+	.matches = {
+		DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+		DMI_MATCH(DMI_PRODUCT_NAME, "ASUS EXPERTBOOK B1400CEAE"),
+		},
+	},
+	{},
+};
+
+static bool ignore_blacklist;
+
+void __init acpi_sleep_no_blacklist(void)
+{
+	ignore_blacklist = true;
+}
+
+static void __init acpi_sleep_dmi_check(void)
+{
+	if (ignore_blacklist)
+		return;
+
+	if (dmi_get_bios_year() >= 2012)
+		acpi_nvs_nosave_s3();
+
+	dmi_check_system(acpisleep_dmi_table);
+}
+
+/**
+ * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
+ */
+static int acpi_pm_freeze(void)
+{
+	acpi_disable_all_gpes();
+	acpi_os_wait_events_complete();
+	acpi_ec_block_transactions();
+	return 0;
+}
+
+/**
+ * acpi_pm_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
+ */
+static int acpi_pm_pre_suspend(void)
+{
+	acpi_pm_freeze();
+	return suspend_nvs_save();
+}
+
+/**
+ *	__acpi_pm_prepare - Prepare the platform to enter the target state.
+ *
+ *	If necessary, set the firmware waking vector and do arch-specific
+ *	nastiness to get the wakeup code to the waking vector.
+ */
+static int __acpi_pm_prepare(void)
+{
+	int error = acpi_sleep_prepare(acpi_target_sleep_state);
+	if (error)
+		acpi_target_sleep_state = ACPI_STATE_S0;
+
+	return error;
+}
+
+/**
+ *	acpi_pm_prepare - Prepare the platform to enter the target sleep
+ *		state and disable the GPEs.
+ */
+static int acpi_pm_prepare(void)
+{
+	int error = __acpi_pm_prepare();
+	if (!error)
+		error = acpi_pm_pre_suspend();
+
+	return error;
+}
+
+/**
+ *	acpi_pm_finish - Instruct the platform to leave a sleep state.
+ *
+ *	This is called after we wake back up (or if entering the sleep state
+ *	failed).
+ */
+static void acpi_pm_finish(void)
+{
+	struct acpi_device *pwr_btn_adev;
+	u32 acpi_state = acpi_target_sleep_state;
+
+	acpi_ec_unblock_transactions();
+	suspend_nvs_free();
+
+	if (acpi_state == ACPI_STATE_S0)
+		return;
+
+	pr_info("Waking up from system sleep state S%d\n", acpi_state);
+	acpi_disable_wakeup_devices(acpi_state);
+	acpi_leave_sleep_state(acpi_state);
+
+	/* reset firmware waking vector */
+	acpi_set_waking_vector(0);
+
+	acpi_target_sleep_state = ACPI_STATE_S0;
+
+	acpi_resume_power_resources();
+
+	/* If we were woken with the fixed power button, provide a small
+	 * hint to userspace in the form of a wakeup event on the fixed power
+	 * button device (if it can be found).
+	 *
+	 * We delay the event generation til now, as the PM layer requires
+	 * timekeeping to be running before we generate events. */
+	if (!pwr_btn_event_pending)
+		return;
+
+	pwr_btn_event_pending = false;
+	pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
+						    NULL, -1);
+	if (pwr_btn_adev) {
+		pm_wakeup_event(&pwr_btn_adev->dev, 0);
+		acpi_dev_put(pwr_btn_adev);
+	}
+}
+
+/**
+ * acpi_pm_start - Start system PM transition.
+ */
+static void acpi_pm_start(u32 acpi_state)
+{
+	acpi_target_sleep_state = acpi_state;
+	acpi_sleep_tts_switch(acpi_target_sleep_state);
+	acpi_scan_lock_acquire();
+}
+
+/**
+ * acpi_pm_end - Finish up system PM transition.
+ */
+static void acpi_pm_end(void)
+{
+	acpi_turn_off_unused_power_resources();
+	acpi_scan_lock_release();
+	/*
+	 * This is necessary in case acpi_pm_finish() is not called during a
+	 * failing transition to a sleep state.
+	 */
+	acpi_target_sleep_state = ACPI_STATE_S0;
+	acpi_sleep_tts_switch(acpi_target_sleep_state);
+}
+#else /* !CONFIG_ACPI_SLEEP */
+#define sleep_no_lps0	(1)
+#define acpi_target_sleep_state	ACPI_STATE_S0
+#define acpi_sleep_default_s3	(1)
+static inline void acpi_sleep_dmi_check(void) {}
+#endif /* CONFIG_ACPI_SLEEP */
+
+#ifdef CONFIG_SUSPEND
+static u32 acpi_suspend_states[] = {
+	[PM_SUSPEND_ON] = ACPI_STATE_S0,
+	[PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
+	[PM_SUSPEND_MEM] = ACPI_STATE_S3,
+	[PM_SUSPEND_MAX] = ACPI_STATE_S5
+};
+
+/**
+ *	acpi_suspend_begin - Set the target system sleep state to the state
+ *		associated with given @pm_state, if supported.
+ */
+static int acpi_suspend_begin(suspend_state_t pm_state)
+{
+	u32 acpi_state = acpi_suspend_states[pm_state];
+	int error;
+
+	error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
+	if (error)
+		return error;
+
+	if (!sleep_states[acpi_state]) {
+		pr_err("ACPI does not support sleep state S%u\n", acpi_state);
+		return -ENOSYS;
+	}
+	if (acpi_state > ACPI_STATE_S1)
+		pm_set_suspend_via_firmware();
+
+	acpi_pm_start(acpi_state);
+	return 0;
+}
+
+/**
+ *	acpi_suspend_enter - Actually enter a sleep state.
+ *	@pm_state: ignored
+ *
+ *	Flush caches and go to sleep. For STR we have to call arch-specific
+ *	assembly, which in turn call acpi_enter_sleep_state().
+ *	It's unfortunate, but it works. Please fix if you're feeling frisky.
+ */
+static int acpi_suspend_enter(suspend_state_t pm_state)
+{
+	acpi_status status = AE_OK;
+	u32 acpi_state = acpi_target_sleep_state;
+	int error;
+
+	trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
+	switch (acpi_state) {
+	case ACPI_STATE_S1:
+		barrier();
+		status = acpi_enter_sleep_state(acpi_state);
+		break;
+
+	case ACPI_STATE_S3:
+		if (!acpi_suspend_lowlevel)
+			return -ENOSYS;
+		error = acpi_suspend_lowlevel();
+		if (error)
+			return error;
+		pr_info("Low-level resume complete\n");
+		pm_set_resume_via_firmware();
+		break;
+	}
+	trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
+
+	/* This violates the spec but is required for bug compatibility. */
+	acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
+
+	/* Reprogram control registers */
+	acpi_leave_sleep_state_prep(acpi_state);
+
+	/* ACPI 3.0 specs (P62) says that it's the responsibility
+	 * of the OSPM to clear the status bit [ implying that the
+	 * POWER_BUTTON event should not reach userspace ]
+	 *
+	 * However, we do generate a small hint for userspace in the form of
+	 * a wakeup event. We flag this condition for now and generate the
+	 * event later, as we're currently too early in resume to be able to
+	 * generate wakeup events.
+	 */
+	if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
+		acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
+
+		acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
+
+		if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
+			acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
+			/* Flag for later */
+			pwr_btn_event_pending = true;
+		}
+	}
+
+	/*
+	 * Disable and clear GPE status before interrupt is enabled. Some GPEs
+	 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
+	 * acpi_leave_sleep_state will reenable specific GPEs later
+	 */
+	acpi_disable_all_gpes();
+	/* Allow EC transactions to happen. */
+	acpi_ec_unblock_transactions();
+
+	suspend_nvs_restore();
+
+	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
+}
+
+static int acpi_suspend_state_valid(suspend_state_t pm_state)
+{
+	u32 acpi_state;
+
+	switch (pm_state) {
+	case PM_SUSPEND_ON:
+	case PM_SUSPEND_STANDBY:
+	case PM_SUSPEND_MEM:
+		acpi_state = acpi_suspend_states[pm_state];
+
+		return sleep_states[acpi_state];
+	default:
+		return 0;
+	}
+}
+
+static const struct platform_suspend_ops acpi_suspend_ops = {
+	.valid = acpi_suspend_state_valid,
+	.begin = acpi_suspend_begin,
+	.prepare_late = acpi_pm_prepare,
+	.enter = acpi_suspend_enter,
+	.wake = acpi_pm_finish,
+	.end = acpi_pm_end,
+};
+
+/**
+ *	acpi_suspend_begin_old - Set the target system sleep state to the
+ *		state associated with given @pm_state, if supported, and
+ *		execute the _PTS control method.  This function is used if the
+ *		pre-ACPI 2.0 suspend ordering has been requested.
+ */
+static int acpi_suspend_begin_old(suspend_state_t pm_state)
+{
+	int error = acpi_suspend_begin(pm_state);
+	if (!error)
+		error = __acpi_pm_prepare();
+
+	return error;
+}
+
+/*
+ * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
+ * been requested.
+ */
+static const struct platform_suspend_ops acpi_suspend_ops_old = {
+	.valid = acpi_suspend_state_valid,
+	.begin = acpi_suspend_begin_old,
+	.prepare_late = acpi_pm_pre_suspend,
+	.enter = acpi_suspend_enter,
+	.wake = acpi_pm_finish,
+	.end = acpi_pm_end,
+	.recover = acpi_pm_finish,
+};
+
+static bool s2idle_wakeup;
+
+int acpi_s2idle_begin(void)
+{
+	acpi_scan_lock_acquire();
+	return 0;
+}
+
+int acpi_s2idle_prepare(void)
+{
+	if (acpi_sci_irq_valid()) {
+		enable_irq_wake(acpi_sci_irq);
+		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
+	}
+
+	acpi_enable_wakeup_devices(ACPI_STATE_S0);
+
+	/* Change the configuration of GPEs to avoid spurious wakeup. */
+	acpi_enable_all_wakeup_gpes();
+	acpi_os_wait_events_complete();
+
+	s2idle_wakeup = true;
+	return 0;
+}
+
+bool acpi_s2idle_wake(void)
+{
+	if (!acpi_sci_irq_valid())
+		return pm_wakeup_pending();
+
+	while (pm_wakeup_pending()) {
+		/*
+		 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
+		 * SCI has not triggered while suspended, so bail out (the
+		 * wakeup is pending anyway and the SCI is not the source of
+		 * it).
+		 */
+		if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
+			pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
+			return true;
+		}
+
+		/*
+		 * If the status bit of any enabled fixed event is set, the
+		 * wakeup is regarded as valid.
+		 */
+		if (acpi_any_fixed_event_status_set()) {
+			pm_pr_dbg("ACPI fixed event wakeup\n");
+			return true;
+		}
+
+		/* Check wakeups from drivers sharing the SCI. */
+		if (acpi_check_wakeup_handlers()) {
+			pm_pr_dbg("ACPI custom handler wakeup\n");
+			return true;
+		}
+
+		/*
+		 * Check non-EC GPE wakeups and if there are none, cancel the
+		 * SCI-related wakeup and dispatch the EC GPE.
+		 */
+		if (acpi_ec_dispatch_gpe()) {
+			pm_pr_dbg("ACPI non-EC GPE wakeup\n");
+			return true;
+		}
+
+		acpi_os_wait_events_complete();
+
+		/*
+		 * The SCI is in the "suspended" state now and it cannot produce
+		 * new wakeup events till the rearming below, so if any of them
+		 * are pending here, they must be resulting from the processing
+		 * of EC events above or coming from somewhere else.
+		 */
+		if (pm_wakeup_pending()) {
+			pm_pr_dbg("Wakeup after ACPI Notify sync\n");
+			return true;
+		}
+
+		pm_pr_dbg("Rearming ACPI SCI for wakeup\n");
+
+		pm_wakeup_clear(acpi_sci_irq);
+		rearm_wake_irq(acpi_sci_irq);
+	}
+
+	return false;
+}
+
+void acpi_s2idle_restore(void)
+{
+	/*
+	 * Drain pending events before restoring the working-state configuration
+	 * of GPEs.
+	 */
+	acpi_os_wait_events_complete(); /* synchronize GPE processing */
+	acpi_ec_flush_work(); /* flush the EC driver's workqueues */
+	acpi_os_wait_events_complete(); /* synchronize Notify handling */
+
+	s2idle_wakeup = false;
+
+	acpi_enable_all_runtime_gpes();
+
+	acpi_disable_wakeup_devices(ACPI_STATE_S0);
+
+	if (acpi_sci_irq_valid()) {
+		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
+		disable_irq_wake(acpi_sci_irq);
+	}
+}
+
+void acpi_s2idle_end(void)
+{
+	acpi_scan_lock_release();
+}
+
+static const struct platform_s2idle_ops acpi_s2idle_ops = {
+	.begin = acpi_s2idle_begin,
+	.prepare = acpi_s2idle_prepare,
+	.wake = acpi_s2idle_wake,
+	.restore = acpi_s2idle_restore,
+	.end = acpi_s2idle_end,
+};
+
+void __weak acpi_s2idle_setup(void)
+{
+	if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
+		pr_info("Efficient low-power S0 idle declared\n");
+
+	s2idle_set_ops(&acpi_s2idle_ops);
+}
+
+static void acpi_sleep_suspend_setup(void)
+{
+	bool suspend_ops_needed = false;
+	int i;
+
+	for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
+		if (acpi_sleep_state_supported(i)) {
+			sleep_states[i] = 1;
+			suspend_ops_needed = true;
+		}
+
+	if (suspend_ops_needed)
+		suspend_set_ops(old_suspend_ordering ?
+				&acpi_suspend_ops_old : &acpi_suspend_ops);
+
+	acpi_s2idle_setup();
+}
+
+#else /* !CONFIG_SUSPEND */
+#define s2idle_wakeup		(false)
+static inline void acpi_sleep_suspend_setup(void) {}
+#endif /* !CONFIG_SUSPEND */
+
+bool acpi_s2idle_wakeup(void)
+{
+	return s2idle_wakeup;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static u32 saved_bm_rld;
+
+static int  acpi_save_bm_rld(void)
+{
+	acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
+	return 0;
+}
+
+static void  acpi_restore_bm_rld(void)
+{
+	u32 resumed_bm_rld = 0;
+
+	acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
+	if (resumed_bm_rld == saved_bm_rld)
+		return;
+
+	acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
+}
+
+static struct syscore_ops acpi_sleep_syscore_ops = {
+	.suspend = acpi_save_bm_rld,
+	.resume = acpi_restore_bm_rld,
+};
+
+static void acpi_sleep_syscore_init(void)
+{
+	register_syscore_ops(&acpi_sleep_syscore_ops);
+}
+#else
+static inline void acpi_sleep_syscore_init(void) {}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_HIBERNATION
+static unsigned long s4_hardware_signature;
+static struct acpi_table_facs *facs;
+int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */
+
+static int acpi_hibernation_begin(pm_message_t stage)
+{
+	if (!nvs_nosave) {
+		int error = suspend_nvs_alloc();
+		if (error)
+			return error;
+	}
+
+	if (stage.event == PM_EVENT_HIBERNATE)
+		pm_set_suspend_via_firmware();
+
+	acpi_pm_start(ACPI_STATE_S4);
+	return 0;
+}
+
+static int acpi_hibernation_enter(void)
+{
+	acpi_status status = AE_OK;
+
+	/* This shouldn't return.  If it returns, we have a problem */
+	status = acpi_enter_sleep_state(ACPI_STATE_S4);
+	/* Reprogram control registers */
+	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
+
+	return ACPI_SUCCESS(status) ? 0 : -EFAULT;
+}
+
+static void acpi_hibernation_leave(void)
+{
+	pm_set_resume_via_firmware();
+	/*
+	 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
+	 * enable it here.
+	 */
+	acpi_enable();
+	/* Reprogram control registers */
+	acpi_leave_sleep_state_prep(ACPI_STATE_S4);
+	/* Check the hardware signature */
+	if (facs && s4_hardware_signature != facs->hardware_signature)
+		pr_crit("Hardware changed while hibernated, success doubtful!\n");
+	/* Restore the NVS memory area */
+	suspend_nvs_restore();
+	/* Allow EC transactions to happen. */
+	acpi_ec_unblock_transactions();
+}
+
+static void acpi_pm_thaw(void)
+{
+	acpi_ec_unblock_transactions();
+	acpi_enable_all_runtime_gpes();
+}
+
+static const struct platform_hibernation_ops acpi_hibernation_ops = {
+	.begin = acpi_hibernation_begin,
+	.end = acpi_pm_end,
+	.pre_snapshot = acpi_pm_prepare,
+	.finish = acpi_pm_finish,
+	.prepare = acpi_pm_prepare,
+	.enter = acpi_hibernation_enter,
+	.leave = acpi_hibernation_leave,
+	.pre_restore = acpi_pm_freeze,
+	.restore_cleanup = acpi_pm_thaw,
+};
+
+/**
+ *	acpi_hibernation_begin_old - Set the target system sleep state to
+ *		ACPI_STATE_S4 and execute the _PTS control method.  This
+ *		function is used if the pre-ACPI 2.0 suspend ordering has been
+ *		requested.
+ */
+static int acpi_hibernation_begin_old(pm_message_t stage)
+{
+	int error;
+	/*
+	 * The _TTS object should always be evaluated before the _PTS object.
+	 * When the old_suspended_ordering is true, the _PTS object is
+	 * evaluated in the acpi_sleep_prepare.
+	 */
+	acpi_sleep_tts_switch(ACPI_STATE_S4);
+
+	error = acpi_sleep_prepare(ACPI_STATE_S4);
+	if (error)
+		return error;
+
+	if (!nvs_nosave) {
+		error = suspend_nvs_alloc();
+		if (error)
+			return error;
+	}
+
+	if (stage.event == PM_EVENT_HIBERNATE)
+		pm_set_suspend_via_firmware();
+
+	acpi_target_sleep_state = ACPI_STATE_S4;
+	acpi_scan_lock_acquire();
+	return 0;
+}
+
+/*
+ * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
+ * been requested.
+ */
+static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
+	.begin = acpi_hibernation_begin_old,
+	.end = acpi_pm_end,
+	.pre_snapshot = acpi_pm_pre_suspend,
+	.prepare = acpi_pm_freeze,
+	.finish = acpi_pm_finish,
+	.enter = acpi_hibernation_enter,
+	.leave = acpi_hibernation_leave,
+	.pre_restore = acpi_pm_freeze,
+	.restore_cleanup = acpi_pm_thaw,
+	.recover = acpi_pm_finish,
+};
+
+static void acpi_sleep_hibernate_setup(void)
+{
+	if (!acpi_sleep_state_supported(ACPI_STATE_S4))
+		return;
+
+	hibernation_set_ops(old_suspend_ordering ?
+			&acpi_hibernation_ops_old : &acpi_hibernation_ops);
+	sleep_states[ACPI_STATE_S4] = 1;
+	if (!acpi_check_s4_hw_signature)
+		return;
+
+	acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
+	if (facs) {
+		/*
+		 * s4_hardware_signature is the local variable which is just
+		 * used to warn about mismatch after we're attempting to
+		 * resume (in violation of the ACPI specification.)
+		 */
+		s4_hardware_signature = facs->hardware_signature;
+
+		if (acpi_check_s4_hw_signature > 0) {
+			/*
+			 * If we're actually obeying the ACPI specification
+			 * then the signature is written out as part of the
+			 * swsusp header, in order to allow the boot kernel
+			 * to gracefully decline to resume.
+			 */
+			swsusp_hardware_signature = facs->hardware_signature;
+		}
+	}
+}
+#else /* !CONFIG_HIBERNATION */
+static inline void acpi_sleep_hibernate_setup(void) {}
+#endif /* !CONFIG_HIBERNATION */
+
+static int acpi_power_off_prepare(struct sys_off_data *data)
+{
+	/* Prepare to power off the system */
+	acpi_sleep_prepare(ACPI_STATE_S5);
+	acpi_disable_all_gpes();
+	acpi_os_wait_events_complete();
+	return NOTIFY_DONE;
+}
+
+static int acpi_power_off(struct sys_off_data *data)
+{
+	/* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
+	pr_debug("%s called\n", __func__);
+	local_irq_disable();
+	acpi_enter_sleep_state(ACPI_STATE_S5);
+	return NOTIFY_DONE;
+}
+
+int __init acpi_sleep_init(void)
+{
+	char supported[ACPI_S_STATE_COUNT * 3 + 1];
+	char *pos = supported;
+	int i;
+
+	acpi_sleep_dmi_check();
+
+	sleep_states[ACPI_STATE_S0] = 1;
+
+	acpi_sleep_syscore_init();
+	acpi_sleep_suspend_setup();
+	acpi_sleep_hibernate_setup();
+
+	if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
+		sleep_states[ACPI_STATE_S5] = 1;
+
+		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
+					 SYS_OFF_PRIO_FIRMWARE,
+					 acpi_power_off_prepare, NULL);
+
+		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+					 SYS_OFF_PRIO_FIRMWARE,
+					 acpi_power_off, NULL);
+
+		/*
+		 * Windows uses S5 for reboot, so some BIOSes depend on it to
+		 * perform proper reboot.
+		 */
+		register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
+					 SYS_OFF_PRIO_FIRMWARE,
+					 acpi_power_off_prepare, NULL);
+	} else {
+		acpi_no_s5 = true;
+	}
+
+	supported[0] = 0;
+	for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
+		if (sleep_states[i])
+			pos += sprintf(pos, " S%d", i);
+	}
+	pr_info("(supports%s)\n", supported);
+
+	/*
+	 * Register the tts_notifier to reboot notifier list so that the _TTS
+	 * object can also be evaluated when the system enters S5.
+	 */
+	register_reboot_notifier(&tts_notifier);
+	return 0;
+}