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, 1047 insertions, 0 deletions

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
new file mode 100644
index 000000000..23507d29f
--- /dev/null
+++ b/drivers/acpi/power.c
@@ -0,0 +1,1047 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/acpi/power.c - ACPI Power Resources management.
+ *
+ * Copyright (C) 2001 - 2015 Intel Corp.
+ * Author: Andy Grover <andrew.grover@intel.com>
+ * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+ */
+
+/*
+ * ACPI power-managed devices may be controlled in two ways:
+ * 1. via "Device Specific (D-State) Control"
+ * 2. via "Power Resource Control".
+ * The code below deals with ACPI Power Resources control.
+ *
+ * An ACPI "power resource object" represents a software controllable power
+ * plane, clock plane, or other resource depended on by a device.
+ *
+ * A device may rely on multiple power resources, and a power resource
+ * may be shared by multiple devices.
+ */
+
+#define pr_fmt(fmt) "ACPI: PM: " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/sysfs.h>
+#include <linux/acpi.h>
+#include "sleep.h"
+#include "internal.h"
+
+#define ACPI_POWER_CLASS		"power_resource"
+#define ACPI_POWER_DEVICE_NAME		"Power Resource"
+#define ACPI_POWER_RESOURCE_STATE_OFF	0x00
+#define ACPI_POWER_RESOURCE_STATE_ON	0x01
+#define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
+
+struct acpi_power_dependent_device {
+	struct device *dev;
+	struct list_head node;
+};
+
+struct acpi_power_resource {
+	struct acpi_device device;
+	struct list_head list_node;
+	u32 system_level;
+	u32 order;
+	unsigned int ref_count;
+	u8 state;
+	struct mutex resource_lock;
+	struct list_head dependents;
+};
+
+struct acpi_power_resource_entry {
+	struct list_head node;
+	struct acpi_power_resource *resource;
+};
+
+static LIST_HEAD(acpi_power_resource_list);
+static DEFINE_MUTEX(power_resource_list_lock);
+
+/* --------------------------------------------------------------------------
+                             Power Resource Management
+   -------------------------------------------------------------------------- */
+
+static inline const char *resource_dev_name(struct acpi_power_resource *pr)
+{
+	return dev_name(&pr->device.dev);
+}
+
+static inline
+struct acpi_power_resource *to_power_resource(struct acpi_device *device)
+{
+	return container_of(device, struct acpi_power_resource, device);
+}
+
+static struct acpi_power_resource *acpi_power_get_context(acpi_handle handle)
+{
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
+
+	if (!device)
+		return NULL;
+
+	return to_power_resource(device);
+}
+
+static int acpi_power_resources_list_add(acpi_handle handle,
+					 struct list_head *list)
+{
+	struct acpi_power_resource *resource = acpi_power_get_context(handle);
+	struct acpi_power_resource_entry *entry;
+
+	if (!resource || !list)
+		return -EINVAL;
+
+	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	entry->resource = resource;
+	if (!list_empty(list)) {
+		struct acpi_power_resource_entry *e;
+
+		list_for_each_entry(e, list, node)
+			if (e->resource->order > resource->order) {
+				list_add_tail(&entry->node, &e->node);
+				return 0;
+			}
+	}
+	list_add_tail(&entry->node, list);
+	return 0;
+}
+
+void acpi_power_resources_list_free(struct list_head *list)
+{
+	struct acpi_power_resource_entry *entry, *e;
+
+	list_for_each_entry_safe(entry, e, list, node) {
+		list_del(&entry->node);
+		kfree(entry);
+	}
+}
+
+static bool acpi_power_resource_is_dup(union acpi_object *package,
+				       unsigned int start, unsigned int i)
+{
+	acpi_handle rhandle, dup;
+	unsigned int j;
+
+	/* The caller is expected to check the package element types */
+	rhandle = package->package.elements[i].reference.handle;
+	for (j = start; j < i; j++) {
+		dup = package->package.elements[j].reference.handle;
+		if (dup == rhandle)
+			return true;
+	}
+
+	return false;
+}
+
+int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
+				 struct list_head *list)
+{
+	unsigned int i;
+	int err = 0;
+
+	for (i = start; i < package->package.count; i++) {
+		union acpi_object *element = &package->package.elements[i];
+		struct acpi_device *rdev;
+		acpi_handle rhandle;
+
+		if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
+			err = -ENODATA;
+			break;
+		}
+		rhandle = element->reference.handle;
+		if (!rhandle) {
+			err = -ENODEV;
+			break;
+		}
+
+		/* Some ACPI tables contain duplicate power resource references */
+		if (acpi_power_resource_is_dup(package, start, i))
+			continue;
+
+		rdev = acpi_add_power_resource(rhandle);
+		if (!rdev) {
+			err = -ENODEV;
+			break;
+		}
+		err = acpi_power_resources_list_add(rhandle, list);
+		if (err)
+			break;
+	}
+	if (err)
+		acpi_power_resources_list_free(list);
+
+	return err;
+}
+
+static int __get_state(acpi_handle handle, u8 *state)
+{
+	acpi_status status = AE_OK;
+	unsigned long long sta = 0;
+	u8 cur_state;
+
+	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	cur_state = sta & ACPI_POWER_RESOURCE_STATE_ON;
+
+	acpi_handle_debug(handle, "Power resource is %s\n",
+			  cur_state ? "on" : "off");
+
+	*state = cur_state;
+	return 0;
+}
+
+static int acpi_power_get_state(struct acpi_power_resource *resource, u8 *state)
+{
+	if (resource->state == ACPI_POWER_RESOURCE_STATE_UNKNOWN) {
+		int ret;
+
+		ret = __get_state(resource->device.handle, &resource->state);
+		if (ret)
+			return ret;
+	}
+
+	*state = resource->state;
+	return 0;
+}
+
+static int acpi_power_get_list_state(struct list_head *list, u8 *state)
+{
+	struct acpi_power_resource_entry *entry;
+	u8 cur_state = ACPI_POWER_RESOURCE_STATE_OFF;
+
+	if (!list || !state)
+		return -EINVAL;
+
+	/* The state of the list is 'on' IFF all resources are 'on'. */
+	list_for_each_entry(entry, list, node) {
+		struct acpi_power_resource *resource = entry->resource;
+		int result;
+
+		mutex_lock(&resource->resource_lock);
+		result = acpi_power_get_state(resource, &cur_state);
+		mutex_unlock(&resource->resource_lock);
+		if (result)
+			return result;
+
+		if (cur_state != ACPI_POWER_RESOURCE_STATE_ON)
+			break;
+	}
+
+	pr_debug("Power resource list is %s\n", cur_state ? "on" : "off");
+
+	*state = cur_state;
+	return 0;
+}
+
+static int
+acpi_power_resource_add_dependent(struct acpi_power_resource *resource,
+				  struct device *dev)
+{
+	struct acpi_power_dependent_device *dep;
+	int ret = 0;
+
+	mutex_lock(&resource->resource_lock);
+	list_for_each_entry(dep, &resource->dependents, node) {
+		/* Only add it once */
+		if (dep->dev == dev)
+			goto unlock;
+	}
+
+	dep = kzalloc(sizeof(*dep), GFP_KERNEL);
+	if (!dep) {
+		ret = -ENOMEM;
+		goto unlock;
+	}
+
+	dep->dev = dev;
+	list_add_tail(&dep->node, &resource->dependents);
+	dev_dbg(dev, "added power dependency to [%s]\n",
+		resource_dev_name(resource));
+
+unlock:
+	mutex_unlock(&resource->resource_lock);
+	return ret;
+}
+
+static void
+acpi_power_resource_remove_dependent(struct acpi_power_resource *resource,
+				     struct device *dev)
+{
+	struct acpi_power_dependent_device *dep;
+
+	mutex_lock(&resource->resource_lock);
+	list_for_each_entry(dep, &resource->dependents, node) {
+		if (dep->dev == dev) {
+			list_del(&dep->node);
+			kfree(dep);
+			dev_dbg(dev, "removed power dependency to [%s]\n",
+				resource_dev_name(resource));
+			break;
+		}
+	}
+	mutex_unlock(&resource->resource_lock);
+}
+
+/**
+ * acpi_device_power_add_dependent - Add dependent device of this ACPI device
+ * @adev: ACPI device pointer
+ * @dev: Dependent device
+ *
+ * If @adev has non-empty _PR0 the @dev is added as dependent device to all
+ * power resources returned by it. This means that whenever these power
+ * resources are turned _ON the dependent devices get runtime resumed. This
+ * is needed for devices such as PCI to allow its driver to re-initialize
+ * it after it went to D0uninitialized.
+ *
+ * If @adev does not have _PR0 this does nothing.
+ *
+ * Returns %0 in case of success and negative errno otherwise.
+ */
+int acpi_device_power_add_dependent(struct acpi_device *adev,
+				    struct device *dev)
+{
+	struct acpi_power_resource_entry *entry;
+	struct list_head *resources;
+	int ret;
+
+	if (!adev->flags.power_manageable)
+		return 0;
+
+	resources = &adev->power.states[ACPI_STATE_D0].resources;
+	list_for_each_entry(entry, resources, node) {
+		ret = acpi_power_resource_add_dependent(entry->resource, dev);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	list_for_each_entry(entry, resources, node)
+		acpi_power_resource_remove_dependent(entry->resource, dev);
+
+	return ret;
+}
+
+/**
+ * acpi_device_power_remove_dependent - Remove dependent device
+ * @adev: ACPI device pointer
+ * @dev: Dependent device
+ *
+ * Does the opposite of acpi_device_power_add_dependent() and removes the
+ * dependent device if it is found. Can be called to @adev that does not
+ * have _PR0 as well.
+ */
+void acpi_device_power_remove_dependent(struct acpi_device *adev,
+					struct device *dev)
+{
+	struct acpi_power_resource_entry *entry;
+	struct list_head *resources;
+
+	if (!adev->flags.power_manageable)
+		return;
+
+	resources = &adev->power.states[ACPI_STATE_D0].resources;
+	list_for_each_entry_reverse(entry, resources, node)
+		acpi_power_resource_remove_dependent(entry->resource, dev);
+}
+
+static int __acpi_power_on(struct acpi_power_resource *resource)
+{
+	acpi_handle handle = resource->device.handle;
+	struct acpi_power_dependent_device *dep;
+	acpi_status status = AE_OK;
+
+	status = acpi_evaluate_object(handle, "_ON", NULL, NULL);
+	if (ACPI_FAILURE(status)) {
+		resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
+		return -ENODEV;
+	}
+
+	resource->state = ACPI_POWER_RESOURCE_STATE_ON;
+
+	acpi_handle_debug(handle, "Power resource turned on\n");
+
+	/*
+	 * If there are other dependents on this power resource we need to
+	 * resume them now so that their drivers can re-initialize the
+	 * hardware properly after it went back to D0.
+	 */
+	if (list_empty(&resource->dependents) ||
+	    list_is_singular(&resource->dependents))
+		return 0;
+
+	list_for_each_entry(dep, &resource->dependents, node) {
+		dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n",
+			resource_dev_name(resource));
+		pm_request_resume(dep->dev);
+	}
+
+	return 0;
+}
+
+static int acpi_power_on_unlocked(struct acpi_power_resource *resource)
+{
+	int result = 0;
+
+	if (resource->ref_count++) {
+		acpi_handle_debug(resource->device.handle,
+				  "Power resource already on\n");
+	} else {
+		result = __acpi_power_on(resource);
+		if (result)
+			resource->ref_count--;
+	}
+	return result;
+}
+
+static int acpi_power_on(struct acpi_power_resource *resource)
+{
+	int result;
+
+	mutex_lock(&resource->resource_lock);
+	result = acpi_power_on_unlocked(resource);
+	mutex_unlock(&resource->resource_lock);
+	return result;
+}
+
+static int __acpi_power_off(struct acpi_power_resource *resource)
+{
+	acpi_handle handle = resource->device.handle;
+	acpi_status status;
+
+	status = acpi_evaluate_object(handle, "_OFF", NULL, NULL);
+	if (ACPI_FAILURE(status)) {
+		resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
+		return -ENODEV;
+	}
+
+	resource->state = ACPI_POWER_RESOURCE_STATE_OFF;
+
+	acpi_handle_debug(handle, "Power resource turned off\n");
+
+	return 0;
+}
+
+static int acpi_power_off_unlocked(struct acpi_power_resource *resource)
+{
+	int result = 0;
+
+	if (!resource->ref_count) {
+		acpi_handle_debug(resource->device.handle,
+				  "Power resource already off\n");
+		return 0;
+	}
+
+	if (--resource->ref_count) {
+		acpi_handle_debug(resource->device.handle,
+				  "Power resource still in use\n");
+	} else {
+		result = __acpi_power_off(resource);
+		if (result)
+			resource->ref_count++;
+	}
+	return result;
+}
+
+static int acpi_power_off(struct acpi_power_resource *resource)
+{
+	int result;
+
+	mutex_lock(&resource->resource_lock);
+	result = acpi_power_off_unlocked(resource);
+	mutex_unlock(&resource->resource_lock);
+	return result;
+}
+
+static int acpi_power_off_list(struct list_head *list)
+{
+	struct acpi_power_resource_entry *entry;
+	int result = 0;
+
+	list_for_each_entry_reverse(entry, list, node) {
+		result = acpi_power_off(entry->resource);
+		if (result)
+			goto err;
+	}
+	return 0;
+
+ err:
+	list_for_each_entry_continue(entry, list, node)
+		acpi_power_on(entry->resource);
+
+	return result;
+}
+
+static int acpi_power_on_list(struct list_head *list)
+{
+	struct acpi_power_resource_entry *entry;
+	int result = 0;
+
+	list_for_each_entry(entry, list, node) {
+		result = acpi_power_on(entry->resource);
+		if (result)
+			goto err;
+	}
+	return 0;
+
+ err:
+	list_for_each_entry_continue_reverse(entry, list, node)
+		acpi_power_off(entry->resource);
+
+	return result;
+}
+
+static struct attribute *attrs[] = {
+	NULL,
+};
+
+static const struct attribute_group attr_groups[] = {
+	[ACPI_STATE_D0] = {
+		.name = "power_resources_D0",
+		.attrs = attrs,
+	},
+	[ACPI_STATE_D1] = {
+		.name = "power_resources_D1",
+		.attrs = attrs,
+	},
+	[ACPI_STATE_D2] = {
+		.name = "power_resources_D2",
+		.attrs = attrs,
+	},
+	[ACPI_STATE_D3_HOT] = {
+		.name = "power_resources_D3hot",
+		.attrs = attrs,
+	},
+};
+
+static const struct attribute_group wakeup_attr_group = {
+	.name = "power_resources_wakeup",
+	.attrs = attrs,
+};
+
+static void acpi_power_hide_list(struct acpi_device *adev,
+				 struct list_head *resources,
+				 const struct attribute_group *attr_group)
+{
+	struct acpi_power_resource_entry *entry;
+
+	if (list_empty(resources))
+		return;
+
+	list_for_each_entry_reverse(entry, resources, node) {
+		struct acpi_device *res_dev = &entry->resource->device;
+
+		sysfs_remove_link_from_group(&adev->dev.kobj,
+					     attr_group->name,
+					     dev_name(&res_dev->dev));
+	}
+	sysfs_remove_group(&adev->dev.kobj, attr_group);
+}
+
+static void acpi_power_expose_list(struct acpi_device *adev,
+				   struct list_head *resources,
+				   const struct attribute_group *attr_group)
+{
+	struct acpi_power_resource_entry *entry;
+	int ret;
+
+	if (list_empty(resources))
+		return;
+
+	ret = sysfs_create_group(&adev->dev.kobj, attr_group);
+	if (ret)
+		return;
+
+	list_for_each_entry(entry, resources, node) {
+		struct acpi_device *res_dev = &entry->resource->device;
+
+		ret = sysfs_add_link_to_group(&adev->dev.kobj,
+					      attr_group->name,
+					      &res_dev->dev.kobj,
+					      dev_name(&res_dev->dev));
+		if (ret) {
+			acpi_power_hide_list(adev, resources, attr_group);
+			break;
+		}
+	}
+}
+
+static void acpi_power_expose_hide(struct acpi_device *adev,
+				   struct list_head *resources,
+				   const struct attribute_group *attr_group,
+				   bool expose)
+{
+	if (expose)
+		acpi_power_expose_list(adev, resources, attr_group);
+	else
+		acpi_power_hide_list(adev, resources, attr_group);
+}
+
+void acpi_power_add_remove_device(struct acpi_device *adev, bool add)
+{
+	int state;
+
+	if (adev->wakeup.flags.valid)
+		acpi_power_expose_hide(adev, &adev->wakeup.resources,
+				       &wakeup_attr_group, add);
+
+	if (!adev->power.flags.power_resources)
+		return;
+
+	for (state = ACPI_STATE_D0; state <= ACPI_STATE_D3_HOT; state++)
+		acpi_power_expose_hide(adev,
+				       &adev->power.states[state].resources,
+				       &attr_groups[state], add);
+}
+
+int acpi_power_wakeup_list_init(struct list_head *list, int *system_level_p)
+{
+	struct acpi_power_resource_entry *entry;
+	int system_level = 5;
+
+	list_for_each_entry(entry, list, node) {
+		struct acpi_power_resource *resource = entry->resource;
+		u8 state;
+
+		mutex_lock(&resource->resource_lock);
+
+		/*
+		 * Make sure that the power resource state and its reference
+		 * counter value are consistent with each other.
+		 */
+		if (!resource->ref_count &&
+		    !acpi_power_get_state(resource, &state) &&
+		    state == ACPI_POWER_RESOURCE_STATE_ON)
+			__acpi_power_off(resource);
+
+		if (system_level > resource->system_level)
+			system_level = resource->system_level;
+
+		mutex_unlock(&resource->resource_lock);
+	}
+	*system_level_p = system_level;
+	return 0;
+}
+
+/* --------------------------------------------------------------------------
+                             Device Power Management
+   -------------------------------------------------------------------------- */
+
+/**
+ * acpi_device_sleep_wake - execute _DSW (Device Sleep Wake) or (deprecated in
+ *                          ACPI 3.0) _PSW (Power State Wake)
+ * @dev: Device to handle.
+ * @enable: 0 - disable, 1 - enable the wake capabilities of the device.
+ * @sleep_state: Target sleep state of the system.
+ * @dev_state: Target power state of the device.
+ *
+ * Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ * State Wake) for the device, if present.  On failure reset the device's
+ * wakeup.flags.valid flag.
+ *
+ * RETURN VALUE:
+ * 0 if either _DSW or _PSW has been successfully executed
+ * 0 if neither _DSW nor _PSW has been found
+ * -ENODEV if the execution of either _DSW or _PSW has failed
+ */
+int acpi_device_sleep_wake(struct acpi_device *dev,
+			   int enable, int sleep_state, int dev_state)
+{
+	union acpi_object in_arg[3];
+	struct acpi_object_list arg_list = { 3, in_arg };
+	acpi_status status = AE_OK;
+
+	/*
+	 * Try to execute _DSW first.
+	 *
+	 * Three arguments are needed for the _DSW object:
+	 * Argument 0: enable/disable the wake capabilities
+	 * Argument 1: target system state
+	 * Argument 2: target device state
+	 * When _DSW object is called to disable the wake capabilities, maybe
+	 * the first argument is filled. The values of the other two arguments
+	 * are meaningless.
+	 */
+	in_arg[0].type = ACPI_TYPE_INTEGER;
+	in_arg[0].integer.value = enable;
+	in_arg[1].type = ACPI_TYPE_INTEGER;
+	in_arg[1].integer.value = sleep_state;
+	in_arg[2].type = ACPI_TYPE_INTEGER;
+	in_arg[2].integer.value = dev_state;
+	status = acpi_evaluate_object(dev->handle, "_DSW", &arg_list, NULL);
+	if (ACPI_SUCCESS(status)) {
+		return 0;
+	} else if (status != AE_NOT_FOUND) {
+		acpi_handle_info(dev->handle, "_DSW execution failed\n");
+		dev->wakeup.flags.valid = 0;
+		return -ENODEV;
+	}
+
+	/* Execute _PSW */
+	status = acpi_execute_simple_method(dev->handle, "_PSW", enable);
+	if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
+		acpi_handle_info(dev->handle, "_PSW execution failed\n");
+		dev->wakeup.flags.valid = 0;
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+/*
+ * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
+ * 1. Power on the power resources required for the wakeup device
+ * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ *    State Wake) for the device, if present
+ */
+int acpi_enable_wakeup_device_power(struct acpi_device *dev, int sleep_state)
+{
+	int err = 0;
+
+	if (!dev || !dev->wakeup.flags.valid)
+		return -EINVAL;
+
+	mutex_lock(&acpi_device_lock);
+
+	dev_dbg(&dev->dev, "Enabling wakeup power (count %d)\n",
+		dev->wakeup.prepare_count);
+
+	if (dev->wakeup.prepare_count++)
+		goto out;
+
+	err = acpi_power_on_list(&dev->wakeup.resources);
+	if (err) {
+		dev_err(&dev->dev, "Cannot turn on wakeup power resources\n");
+		dev->wakeup.flags.valid = 0;
+		goto out;
+	}
+
+	/*
+	 * Passing 3 as the third argument below means the device may be
+	 * put into arbitrary power state afterward.
+	 */
+	err = acpi_device_sleep_wake(dev, 1, sleep_state, 3);
+	if (err) {
+		acpi_power_off_list(&dev->wakeup.resources);
+		dev->wakeup.prepare_count = 0;
+		goto out;
+	}
+
+	dev_dbg(&dev->dev, "Wakeup power enabled\n");
+
+ out:
+	mutex_unlock(&acpi_device_lock);
+	return err;
+}
+
+/*
+ * Shutdown a wakeup device, counterpart of above method
+ * 1. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
+ *    State Wake) for the device, if present
+ * 2. Shutdown down the power resources
+ */
+int acpi_disable_wakeup_device_power(struct acpi_device *dev)
+{
+	struct acpi_power_resource_entry *entry;
+	int err = 0;
+
+	if (!dev || !dev->wakeup.flags.valid)
+		return -EINVAL;
+
+	mutex_lock(&acpi_device_lock);
+
+	dev_dbg(&dev->dev, "Disabling wakeup power (count %d)\n",
+		dev->wakeup.prepare_count);
+
+	/* Do nothing if wakeup power has not been enabled for this device. */
+	if (dev->wakeup.prepare_count <= 0)
+		goto out;
+
+	if (--dev->wakeup.prepare_count > 0)
+		goto out;
+
+	err = acpi_device_sleep_wake(dev, 0, 0, 0);
+	if (err)
+		goto out;
+
+	/*
+	 * All of the power resources in the list need to be turned off even if
+	 * there are errors.
+	 */
+	list_for_each_entry(entry, &dev->wakeup.resources, node) {
+		int ret;
+
+		ret = acpi_power_off(entry->resource);
+		if (ret && !err)
+			err = ret;
+	}
+	if (err) {
+		dev_err(&dev->dev, "Cannot turn off wakeup power resources\n");
+		dev->wakeup.flags.valid = 0;
+		goto out;
+	}
+
+	dev_dbg(&dev->dev, "Wakeup power disabled\n");
+
+ out:
+	mutex_unlock(&acpi_device_lock);
+	return err;
+}
+
+int acpi_power_get_inferred_state(struct acpi_device *device, int *state)
+{
+	u8 list_state = ACPI_POWER_RESOURCE_STATE_OFF;
+	int result = 0;
+	int i = 0;
+
+	if (!device || !state)
+		return -EINVAL;
+
+	/*
+	 * We know a device's inferred power state when all the resources
+	 * required for a given D-state are 'on'.
+	 */
+	for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
+		struct list_head *list = &device->power.states[i].resources;
+
+		if (list_empty(list))
+			continue;
+
+		result = acpi_power_get_list_state(list, &list_state);
+		if (result)
+			return result;
+
+		if (list_state == ACPI_POWER_RESOURCE_STATE_ON) {
+			*state = i;
+			return 0;
+		}
+	}
+
+	*state = device->power.states[ACPI_STATE_D3_COLD].flags.valid ?
+		ACPI_STATE_D3_COLD : ACPI_STATE_D3_HOT;
+	return 0;
+}
+
+int acpi_power_on_resources(struct acpi_device *device, int state)
+{
+	if (!device || state < ACPI_STATE_D0 || state > ACPI_STATE_D3_HOT)
+		return -EINVAL;
+
+	return acpi_power_on_list(&device->power.states[state].resources);
+}
+
+int acpi_power_transition(struct acpi_device *device, int state)
+{
+	int result = 0;
+
+	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
+		return -EINVAL;
+
+	if (device->power.state == state || !device->flags.power_manageable)
+		return 0;
+
+	if ((device->power.state < ACPI_STATE_D0)
+	    || (device->power.state > ACPI_STATE_D3_COLD))
+		return -ENODEV;
+
+	/*
+	 * First we reference all power resources required in the target list
+	 * (e.g. so the device doesn't lose power while transitioning).  Then,
+	 * we dereference all power resources used in the current list.
+	 */
+	if (state < ACPI_STATE_D3_COLD)
+		result = acpi_power_on_list(
+			&device->power.states[state].resources);
+
+	if (!result && device->power.state < ACPI_STATE_D3_COLD)
+		acpi_power_off_list(
+			&device->power.states[device->power.state].resources);
+
+	/* We shouldn't change the state unless the above operations succeed. */
+	device->power.state = result ? ACPI_STATE_UNKNOWN : state;
+
+	return result;
+}
+
+static void acpi_release_power_resource(struct device *dev)
+{
+	struct acpi_device *device = to_acpi_device(dev);
+	struct acpi_power_resource *resource;
+
+	resource = container_of(device, struct acpi_power_resource, device);
+
+	mutex_lock(&power_resource_list_lock);
+	list_del(&resource->list_node);
+	mutex_unlock(&power_resource_list_lock);
+
+	acpi_free_pnp_ids(&device->pnp);
+	kfree(resource);
+}
+
+static ssize_t resource_in_use_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
+{
+	struct acpi_power_resource *resource;
+
+	resource = to_power_resource(to_acpi_device(dev));
+	return sprintf(buf, "%u\n", !!resource->ref_count);
+}
+static DEVICE_ATTR_RO(resource_in_use);
+
+static void acpi_power_sysfs_remove(struct acpi_device *device)
+{
+	device_remove_file(&device->dev, &dev_attr_resource_in_use);
+}
+
+static void acpi_power_add_resource_to_list(struct acpi_power_resource *resource)
+{
+	mutex_lock(&power_resource_list_lock);
+
+	if (!list_empty(&acpi_power_resource_list)) {
+		struct acpi_power_resource *r;
+
+		list_for_each_entry(r, &acpi_power_resource_list, list_node)
+			if (r->order > resource->order) {
+				list_add_tail(&resource->list_node, &r->list_node);
+				goto out;
+			}
+	}
+	list_add_tail(&resource->list_node, &acpi_power_resource_list);
+
+ out:
+	mutex_unlock(&power_resource_list_lock);
+}
+
+struct acpi_device *acpi_add_power_resource(acpi_handle handle)
+{
+	struct acpi_device *device = acpi_fetch_acpi_dev(handle);
+	struct acpi_power_resource *resource;
+	union acpi_object acpi_object;
+	struct acpi_buffer buffer = { sizeof(acpi_object), &acpi_object };
+	acpi_status status;
+	u8 state_dummy;
+	int result;
+
+	if (device)
+		return device;
+
+	resource = kzalloc(sizeof(*resource), GFP_KERNEL);
+	if (!resource)
+		return NULL;
+
+	device = &resource->device;
+	acpi_init_device_object(device, handle, ACPI_BUS_TYPE_POWER,
+				acpi_release_power_resource);
+	mutex_init(&resource->resource_lock);
+	INIT_LIST_HEAD(&resource->list_node);
+	INIT_LIST_HEAD(&resource->dependents);
+	strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
+	strcpy(acpi_device_class(device), ACPI_POWER_CLASS);
+	device->power.state = ACPI_STATE_UNKNOWN;
+	device->flags.match_driver = true;
+
+	/* Evaluate the object to get the system level and resource order. */
+	status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
+	if (ACPI_FAILURE(status))
+		goto err;
+
+	resource->system_level = acpi_object.power_resource.system_level;
+	resource->order = acpi_object.power_resource.resource_order;
+	resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
+
+	/* Get the initial state or just flip it on if that fails. */
+	if (acpi_power_get_state(resource, &state_dummy))
+		__acpi_power_on(resource);
+
+	acpi_handle_info(handle, "New power resource\n");
+
+	result = acpi_tie_acpi_dev(device);
+	if (result)
+		goto err;
+
+	result = acpi_device_add(device);
+	if (result)
+		goto err;
+
+	if (!device_create_file(&device->dev, &dev_attr_resource_in_use))
+		device->remove = acpi_power_sysfs_remove;
+
+	acpi_power_add_resource_to_list(resource);
+	acpi_device_add_finalize(device);
+	return device;
+
+ err:
+	acpi_release_power_resource(&device->dev);
+	return NULL;
+}
+
+#ifdef CONFIG_ACPI_SLEEP
+void acpi_resume_power_resources(void)
+{
+	struct acpi_power_resource *resource;
+
+	mutex_lock(&power_resource_list_lock);
+
+	list_for_each_entry(resource, &acpi_power_resource_list, list_node) {
+		int result;
+		u8 state;
+
+		mutex_lock(&resource->resource_lock);
+
+		resource->state = ACPI_POWER_RESOURCE_STATE_UNKNOWN;
+		result = acpi_power_get_state(resource, &state);
+		if (result) {
+			mutex_unlock(&resource->resource_lock);
+			continue;
+		}
+
+		if (state == ACPI_POWER_RESOURCE_STATE_OFF
+		    && resource->ref_count) {
+			acpi_handle_debug(resource->device.handle, "Turning ON\n");
+			__acpi_power_on(resource);
+		}
+
+		mutex_unlock(&resource->resource_lock);
+	}
+
+	mutex_unlock(&power_resource_list_lock);
+}
+#endif
+
+/**
+ * acpi_turn_off_unused_power_resources - Turn off power resources not in use.
+ */
+void acpi_turn_off_unused_power_resources(void)
+{
+	struct acpi_power_resource *resource;
+
+	mutex_lock(&power_resource_list_lock);
+
+	list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
+		mutex_lock(&resource->resource_lock);
+
+		if (!resource->ref_count &&
+		    resource->state == ACPI_POWER_RESOURCE_STATE_ON) {
+			acpi_handle_debug(resource->device.handle, "Turning OFF\n");
+			__acpi_power_off(resource);
+		}
+
+		mutex_unlock(&resource->resource_lock);
+	}
+
+	mutex_unlock(&power_resource_list_lock);
+}