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, 1770 insertions, 0 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
new file mode 100644
index 000000000..3269a888f
--- /dev/null
+++ b/drivers/acpi/osl.c
@@ -0,0 +1,1770 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  acpi_osl.c - OS-dependent functions ($Revision: 83 $)
+ *
+ *  Copyright (C) 2000       Andrew Henroid
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (c) 2008 Intel Corporation
+ *   Author: Matthew Wilcox <willy@linux.intel.com>
+ */
+
+#define pr_fmt(fmt) "ACPI: OSL: " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/lockdep.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/kmod.h>
+#include <linux/delay.h>
+#include <linux/workqueue.h>
+#include <linux/nmi.h>
+#include <linux/acpi.h>
+#include <linux/efi.h>
+#include <linux/ioport.h>
+#include <linux/list.h>
+#include <linux/jiffies.h>
+#include <linux/semaphore.h>
+#include <linux/security.h>
+
+#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+
+#include "acpica/accommon.h"
+#include "internal.h"
+
+/* Definitions for ACPI_DEBUG_PRINT() */
+#define _COMPONENT		ACPI_OS_SERVICES
+ACPI_MODULE_NAME("osl");
+
+struct acpi_os_dpc {
+	acpi_osd_exec_callback function;
+	void *context;
+	struct work_struct work;
+};
+
+#ifdef ENABLE_DEBUGGER
+#include <linux/kdb.h>
+
+/* stuff for debugger support */
+int acpi_in_debugger;
+EXPORT_SYMBOL(acpi_in_debugger);
+#endif				/*ENABLE_DEBUGGER */
+
+static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
+				      u32 pm1b_ctrl);
+static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
+				      u32 val_b);
+
+static acpi_osd_handler acpi_irq_handler;
+static void *acpi_irq_context;
+static struct workqueue_struct *kacpid_wq;
+static struct workqueue_struct *kacpi_notify_wq;
+static struct workqueue_struct *kacpi_hotplug_wq;
+static bool acpi_os_initialized;
+unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
+bool acpi_permanent_mmap = false;
+
+/*
+ * This list of permanent mappings is for memory that may be accessed from
+ * interrupt context, where we can't do the ioremap().
+ */
+struct acpi_ioremap {
+	struct list_head list;
+	void __iomem *virt;
+	acpi_physical_address phys;
+	acpi_size size;
+	union {
+		unsigned long refcount;
+		struct rcu_work rwork;
+	} track;
+};
+
+static LIST_HEAD(acpi_ioremaps);
+static DEFINE_MUTEX(acpi_ioremap_lock);
+#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map)
+
+static void __init acpi_request_region (struct acpi_generic_address *gas,
+	unsigned int length, char *desc)
+{
+	u64 addr;
+
+	/* Handle possible alignment issues */
+	memcpy(&addr, &gas->address, sizeof(addr));
+	if (!addr || !length)
+		return;
+
+	/* Resources are never freed */
+	if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_IO)
+		request_region(addr, length, desc);
+	else if (gas->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
+		request_mem_region(addr, length, desc);
+}
+
+static int __init acpi_reserve_resources(void)
+{
+	acpi_request_region(&acpi_gbl_FADT.xpm1a_event_block, acpi_gbl_FADT.pm1_event_length,
+		"ACPI PM1a_EVT_BLK");
+
+	acpi_request_region(&acpi_gbl_FADT.xpm1b_event_block, acpi_gbl_FADT.pm1_event_length,
+		"ACPI PM1b_EVT_BLK");
+
+	acpi_request_region(&acpi_gbl_FADT.xpm1a_control_block, acpi_gbl_FADT.pm1_control_length,
+		"ACPI PM1a_CNT_BLK");
+
+	acpi_request_region(&acpi_gbl_FADT.xpm1b_control_block, acpi_gbl_FADT.pm1_control_length,
+		"ACPI PM1b_CNT_BLK");
+
+	if (acpi_gbl_FADT.pm_timer_length == 4)
+		acpi_request_region(&acpi_gbl_FADT.xpm_timer_block, 4, "ACPI PM_TMR");
+
+	acpi_request_region(&acpi_gbl_FADT.xpm2_control_block, acpi_gbl_FADT.pm2_control_length,
+		"ACPI PM2_CNT_BLK");
+
+	/* Length of GPE blocks must be a non-negative multiple of 2 */
+
+	if (!(acpi_gbl_FADT.gpe0_block_length & 0x1))
+		acpi_request_region(&acpi_gbl_FADT.xgpe0_block,
+			       acpi_gbl_FADT.gpe0_block_length, "ACPI GPE0_BLK");
+
+	if (!(acpi_gbl_FADT.gpe1_block_length & 0x1))
+		acpi_request_region(&acpi_gbl_FADT.xgpe1_block,
+			       acpi_gbl_FADT.gpe1_block_length, "ACPI GPE1_BLK");
+
+	return 0;
+}
+fs_initcall_sync(acpi_reserve_resources);
+
+void acpi_os_printf(const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	acpi_os_vprintf(fmt, args);
+	va_end(args);
+}
+EXPORT_SYMBOL(acpi_os_printf);
+
+void acpi_os_vprintf(const char *fmt, va_list args)
+{
+	static char buffer[512];
+
+	vsprintf(buffer, fmt, args);
+
+#ifdef ENABLE_DEBUGGER
+	if (acpi_in_debugger) {
+		kdb_printf("%s", buffer);
+	} else {
+		if (printk_get_level(buffer))
+			printk("%s", buffer);
+		else
+			printk(KERN_CONT "%s", buffer);
+	}
+#else
+	if (acpi_debugger_write_log(buffer) < 0) {
+		if (printk_get_level(buffer))
+			printk("%s", buffer);
+		else
+			printk(KERN_CONT "%s", buffer);
+	}
+#endif
+}
+
+#ifdef CONFIG_KEXEC
+static unsigned long acpi_rsdp;
+static int __init setup_acpi_rsdp(char *arg)
+{
+	return kstrtoul(arg, 16, &acpi_rsdp);
+}
+early_param("acpi_rsdp", setup_acpi_rsdp);
+#endif
+
+acpi_physical_address __init acpi_os_get_root_pointer(void)
+{
+	acpi_physical_address pa;
+
+#ifdef CONFIG_KEXEC
+	/*
+	 * We may have been provided with an RSDP on the command line,
+	 * but if a malicious user has done so they may be pointing us
+	 * at modified ACPI tables that could alter kernel behaviour -
+	 * so, we check the lockdown status before making use of
+	 * it. If we trust it then also stash it in an architecture
+	 * specific location (if appropriate) so it can be carried
+	 * over further kexec()s.
+	 */
+	if (acpi_rsdp && !security_locked_down(LOCKDOWN_ACPI_TABLES)) {
+		acpi_arch_set_root_pointer(acpi_rsdp);
+		return acpi_rsdp;
+	}
+#endif
+	pa = acpi_arch_get_root_pointer();
+	if (pa)
+		return pa;
+
+	if (efi_enabled(EFI_CONFIG_TABLES)) {
+		if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
+			return efi.acpi20;
+		if (efi.acpi != EFI_INVALID_TABLE_ADDR)
+			return efi.acpi;
+		pr_err("System description tables not found\n");
+	} else if (IS_ENABLED(CONFIG_ACPI_LEGACY_TABLES_LOOKUP)) {
+		acpi_find_root_pointer(&pa);
+	}
+
+	return pa;
+}
+
+/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
+static struct acpi_ioremap *
+acpi_map_lookup(acpi_physical_address phys, acpi_size size)
+{
+	struct acpi_ioremap *map;
+
+	list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
+		if (map->phys <= phys &&
+		    phys + size <= map->phys + map->size)
+			return map;
+
+	return NULL;
+}
+
+/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
+static void __iomem *
+acpi_map_vaddr_lookup(acpi_physical_address phys, unsigned int size)
+{
+	struct acpi_ioremap *map;
+
+	map = acpi_map_lookup(phys, size);
+	if (map)
+		return map->virt + (phys - map->phys);
+
+	return NULL;
+}
+
+void __iomem *acpi_os_get_iomem(acpi_physical_address phys, unsigned int size)
+{
+	struct acpi_ioremap *map;
+	void __iomem *virt = NULL;
+
+	mutex_lock(&acpi_ioremap_lock);
+	map = acpi_map_lookup(phys, size);
+	if (map) {
+		virt = map->virt + (phys - map->phys);
+		map->track.refcount++;
+	}
+	mutex_unlock(&acpi_ioremap_lock);
+	return virt;
+}
+EXPORT_SYMBOL_GPL(acpi_os_get_iomem);
+
+/* Must be called with 'acpi_ioremap_lock' or RCU read lock held. */
+static struct acpi_ioremap *
+acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
+{
+	struct acpi_ioremap *map;
+
+	list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held())
+		if (map->virt <= virt &&
+		    virt + size <= map->virt + map->size)
+			return map;
+
+	return NULL;
+}
+
+#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
+/* ioremap will take care of cache attributes */
+#define should_use_kmap(pfn)   0
+#else
+#define should_use_kmap(pfn)   page_is_ram(pfn)
+#endif
+
+static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
+{
+	unsigned long pfn;
+
+	pfn = pg_off >> PAGE_SHIFT;
+	if (should_use_kmap(pfn)) {
+		if (pg_sz > PAGE_SIZE)
+			return NULL;
+		return (void __iomem __force *)kmap(pfn_to_page(pfn));
+	} else
+		return acpi_os_ioremap(pg_off, pg_sz);
+}
+
+static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
+{
+	unsigned long pfn;
+
+	pfn = pg_off >> PAGE_SHIFT;
+	if (should_use_kmap(pfn))
+		kunmap(pfn_to_page(pfn));
+	else
+		iounmap(vaddr);
+}
+
+/**
+ * acpi_os_map_iomem - Get a virtual address for a given physical address range.
+ * @phys: Start of the physical address range to map.
+ * @size: Size of the physical address range to map.
+ *
+ * Look up the given physical address range in the list of existing ACPI memory
+ * mappings.  If found, get a reference to it and return a pointer to it (its
+ * virtual address).  If not found, map it, add it to that list and return a
+ * pointer to it.
+ *
+ * During early init (when acpi_permanent_mmap has not been set yet) this
+ * routine simply calls __acpi_map_table() to get the job done.
+ */
+void __iomem __ref
+*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
+{
+	struct acpi_ioremap *map;
+	void __iomem *virt;
+	acpi_physical_address pg_off;
+	acpi_size pg_sz;
+
+	if (phys > ULONG_MAX) {
+		pr_err("Cannot map memory that high: 0x%llx\n", phys);
+		return NULL;
+	}
+
+	if (!acpi_permanent_mmap)
+		return __acpi_map_table((unsigned long)phys, size);
+
+	mutex_lock(&acpi_ioremap_lock);
+	/* Check if there's a suitable mapping already. */
+	map = acpi_map_lookup(phys, size);
+	if (map) {
+		map->track.refcount++;
+		goto out;
+	}
+
+	map = kzalloc(sizeof(*map), GFP_KERNEL);
+	if (!map) {
+		mutex_unlock(&acpi_ioremap_lock);
+		return NULL;
+	}
+
+	pg_off = round_down(phys, PAGE_SIZE);
+	pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
+	virt = acpi_map(phys, size);
+	if (!virt) {
+		mutex_unlock(&acpi_ioremap_lock);
+		kfree(map);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&map->list);
+	map->virt = (void __iomem __force *)((unsigned long)virt & PAGE_MASK);
+	map->phys = pg_off;
+	map->size = pg_sz;
+	map->track.refcount = 1;
+
+	list_add_tail_rcu(&map->list, &acpi_ioremaps);
+
+out:
+	mutex_unlock(&acpi_ioremap_lock);
+	return map->virt + (phys - map->phys);
+}
+EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
+
+void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
+{
+	return (void *)acpi_os_map_iomem(phys, size);
+}
+EXPORT_SYMBOL_GPL(acpi_os_map_memory);
+
+static void acpi_os_map_remove(struct work_struct *work)
+{
+	struct acpi_ioremap *map = container_of(to_rcu_work(work),
+						struct acpi_ioremap,
+						track.rwork);
+
+	acpi_unmap(map->phys, map->virt);
+	kfree(map);
+}
+
+/* Must be called with mutex_lock(&acpi_ioremap_lock) */
+static void acpi_os_drop_map_ref(struct acpi_ioremap *map)
+{
+	if (--map->track.refcount)
+		return;
+
+	list_del_rcu(&map->list);
+
+	INIT_RCU_WORK(&map->track.rwork, acpi_os_map_remove);
+	queue_rcu_work(system_wq, &map->track.rwork);
+}
+
+/**
+ * acpi_os_unmap_iomem - Drop a memory mapping reference.
+ * @virt: Start of the address range to drop a reference to.
+ * @size: Size of the address range to drop a reference to.
+ *
+ * Look up the given virtual address range in the list of existing ACPI memory
+ * mappings, drop a reference to it and if there are no more active references
+ * to it, queue it up for later removal.
+ *
+ * During early init (when acpi_permanent_mmap has not been set yet) this
+ * routine simply calls __acpi_unmap_table() to get the job done.  Since
+ * __acpi_unmap_table() is an __init function, the __ref annotation is needed
+ * here.
+ */
+void __ref acpi_os_unmap_iomem(void __iomem *virt, acpi_size size)
+{
+	struct acpi_ioremap *map;
+
+	if (!acpi_permanent_mmap) {
+		__acpi_unmap_table(virt, size);
+		return;
+	}
+
+	mutex_lock(&acpi_ioremap_lock);
+
+	map = acpi_map_lookup_virt(virt, size);
+	if (!map) {
+		mutex_unlock(&acpi_ioremap_lock);
+		WARN(true, "ACPI: %s: bad address %p\n", __func__, virt);
+		return;
+	}
+	acpi_os_drop_map_ref(map);
+
+	mutex_unlock(&acpi_ioremap_lock);
+}
+EXPORT_SYMBOL_GPL(acpi_os_unmap_iomem);
+
+/**
+ * acpi_os_unmap_memory - Drop a memory mapping reference.
+ * @virt: Start of the address range to drop a reference to.
+ * @size: Size of the address range to drop a reference to.
+ */
+void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
+{
+	acpi_os_unmap_iomem((void __iomem *)virt, size);
+}
+EXPORT_SYMBOL_GPL(acpi_os_unmap_memory);
+
+void __iomem *acpi_os_map_generic_address(struct acpi_generic_address *gas)
+{
+	u64 addr;
+
+	if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
+		return NULL;
+
+	/* Handle possible alignment issues */
+	memcpy(&addr, &gas->address, sizeof(addr));
+	if (!addr || !gas->bit_width)
+		return NULL;
+
+	return acpi_os_map_iomem(addr, gas->bit_width / 8);
+}
+EXPORT_SYMBOL(acpi_os_map_generic_address);
+
+void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
+{
+	u64 addr;
+	struct acpi_ioremap *map;
+
+	if (gas->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
+		return;
+
+	/* Handle possible alignment issues */
+	memcpy(&addr, &gas->address, sizeof(addr));
+	if (!addr || !gas->bit_width)
+		return;
+
+	mutex_lock(&acpi_ioremap_lock);
+
+	map = acpi_map_lookup(addr, gas->bit_width / 8);
+	if (!map) {
+		mutex_unlock(&acpi_ioremap_lock);
+		return;
+	}
+	acpi_os_drop_map_ref(map);
+
+	mutex_unlock(&acpi_ioremap_lock);
+}
+EXPORT_SYMBOL(acpi_os_unmap_generic_address);
+
+#ifdef ACPI_FUTURE_USAGE
+acpi_status
+acpi_os_get_physical_address(void *virt, acpi_physical_address * phys)
+{
+	if (!phys || !virt)
+		return AE_BAD_PARAMETER;
+
+	*phys = virt_to_phys(virt);
+
+	return AE_OK;
+}
+#endif
+
+#ifdef CONFIG_ACPI_REV_OVERRIDE_POSSIBLE
+static bool acpi_rev_override;
+
+int __init acpi_rev_override_setup(char *str)
+{
+	acpi_rev_override = true;
+	return 1;
+}
+__setup("acpi_rev_override", acpi_rev_override_setup);
+#else
+#define acpi_rev_override	false
+#endif
+
+#define ACPI_MAX_OVERRIDE_LEN 100
+
+static char acpi_os_name[ACPI_MAX_OVERRIDE_LEN];
+
+acpi_status
+acpi_os_predefined_override(const struct acpi_predefined_names *init_val,
+			    acpi_string *new_val)
+{
+	if (!init_val || !new_val)
+		return AE_BAD_PARAMETER;
+
+	*new_val = NULL;
+	if (!memcmp(init_val->name, "_OS_", 4) && strlen(acpi_os_name)) {
+		pr_info("Overriding _OS definition to '%s'\n", acpi_os_name);
+		*new_val = acpi_os_name;
+	}
+
+	if (!memcmp(init_val->name, "_REV", 4) && acpi_rev_override) {
+		pr_info("Overriding _REV return value to 5\n");
+		*new_val = (char *)5;
+	}
+
+	return AE_OK;
+}
+
+static irqreturn_t acpi_irq(int irq, void *dev_id)
+{
+	u32 handled;
+
+	handled = (*acpi_irq_handler) (acpi_irq_context);
+
+	if (handled) {
+		acpi_irq_handled++;
+		return IRQ_HANDLED;
+	} else {
+		acpi_irq_not_handled++;
+		return IRQ_NONE;
+	}
+}
+
+acpi_status
+acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
+				  void *context)
+{
+	unsigned int irq;
+
+	acpi_irq_stats_init();
+
+	/*
+	 * ACPI interrupts different from the SCI in our copy of the FADT are
+	 * not supported.
+	 */
+	if (gsi != acpi_gbl_FADT.sci_interrupt)
+		return AE_BAD_PARAMETER;
+
+	if (acpi_irq_handler)
+		return AE_ALREADY_ACQUIRED;
+
+	if (acpi_gsi_to_irq(gsi, &irq) < 0) {
+		pr_err("SCI (ACPI GSI %d) not registered\n", gsi);
+		return AE_OK;
+	}
+
+	acpi_irq_handler = handler;
+	acpi_irq_context = context;
+	if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
+		pr_err("SCI (IRQ%d) allocation failed\n", irq);
+		acpi_irq_handler = NULL;
+		return AE_NOT_ACQUIRED;
+	}
+	acpi_sci_irq = irq;
+
+	return AE_OK;
+}
+
+acpi_status acpi_os_remove_interrupt_handler(u32 gsi, acpi_osd_handler handler)
+{
+	if (gsi != acpi_gbl_FADT.sci_interrupt || !acpi_sci_irq_valid())
+		return AE_BAD_PARAMETER;
+
+	free_irq(acpi_sci_irq, acpi_irq);
+	acpi_irq_handler = NULL;
+	acpi_sci_irq = INVALID_ACPI_IRQ;
+
+	return AE_OK;
+}
+
+/*
+ * Running in interpreter thread context, safe to sleep
+ */
+
+void acpi_os_sleep(u64 ms)
+{
+	msleep(ms);
+}
+
+void acpi_os_stall(u32 us)
+{
+	while (us) {
+		u32 delay = 1000;
+
+		if (delay > us)
+			delay = us;
+		udelay(delay);
+		touch_nmi_watchdog();
+		us -= delay;
+	}
+}
+
+/*
+ * Support ACPI 3.0 AML Timer operand. Returns a 64-bit free-running,
+ * monotonically increasing timer with 100ns granularity. Do not use
+ * ktime_get() to implement this function because this function may get
+ * called after timekeeping has been suspended. Note: calling this function
+ * after timekeeping has been suspended may lead to unexpected results
+ * because when timekeeping is suspended the jiffies counter is not
+ * incremented. See also timekeeping_suspend().
+ */
+u64 acpi_os_get_timer(void)
+{
+	return (get_jiffies_64() - INITIAL_JIFFIES) *
+		(ACPI_100NSEC_PER_SEC / HZ);
+}
+
+acpi_status acpi_os_read_port(acpi_io_address port, u32 *value, u32 width)
+{
+	u32 dummy;
+
+	if (value)
+		*value = 0;
+	else
+		value = &dummy;
+
+	if (width <= 8) {
+		*value = inb(port);
+	} else if (width <= 16) {
+		*value = inw(port);
+	} else if (width <= 32) {
+		*value = inl(port);
+	} else {
+		pr_debug("%s: Access width %d not supported\n", __func__, width);
+		return AE_BAD_PARAMETER;
+	}
+
+	return AE_OK;
+}
+
+EXPORT_SYMBOL(acpi_os_read_port);
+
+acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width)
+{
+	if (width <= 8) {
+		outb(value, port);
+	} else if (width <= 16) {
+		outw(value, port);
+	} else if (width <= 32) {
+		outl(value, port);
+	} else {
+		pr_debug("%s: Access width %d not supported\n", __func__, width);
+		return AE_BAD_PARAMETER;
+	}
+
+	return AE_OK;
+}
+
+EXPORT_SYMBOL(acpi_os_write_port);
+
+int acpi_os_read_iomem(void __iomem *virt_addr, u64 *value, u32 width)
+{
+
+	switch (width) {
+	case 8:
+		*(u8 *) value = readb(virt_addr);
+		break;
+	case 16:
+		*(u16 *) value = readw(virt_addr);
+		break;
+	case 32:
+		*(u32 *) value = readl(virt_addr);
+		break;
+	case 64:
+		*(u64 *) value = readq(virt_addr);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+acpi_status
+acpi_os_read_memory(acpi_physical_address phys_addr, u64 *value, u32 width)
+{
+	void __iomem *virt_addr;
+	unsigned int size = width / 8;
+	bool unmap = false;
+	u64 dummy;
+	int error;
+
+	rcu_read_lock();
+	virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
+	if (!virt_addr) {
+		rcu_read_unlock();
+		virt_addr = acpi_os_ioremap(phys_addr, size);
+		if (!virt_addr)
+			return AE_BAD_ADDRESS;
+		unmap = true;
+	}
+
+	if (!value)
+		value = &dummy;
+
+	error = acpi_os_read_iomem(virt_addr, value, width);
+	BUG_ON(error);
+
+	if (unmap)
+		iounmap(virt_addr);
+	else
+		rcu_read_unlock();
+
+	return AE_OK;
+}
+
+acpi_status
+acpi_os_write_memory(acpi_physical_address phys_addr, u64 value, u32 width)
+{
+	void __iomem *virt_addr;
+	unsigned int size = width / 8;
+	bool unmap = false;
+
+	rcu_read_lock();
+	virt_addr = acpi_map_vaddr_lookup(phys_addr, size);
+	if (!virt_addr) {
+		rcu_read_unlock();
+		virt_addr = acpi_os_ioremap(phys_addr, size);
+		if (!virt_addr)
+			return AE_BAD_ADDRESS;
+		unmap = true;
+	}
+
+	switch (width) {
+	case 8:
+		writeb(value, virt_addr);
+		break;
+	case 16:
+		writew(value, virt_addr);
+		break;
+	case 32:
+		writel(value, virt_addr);
+		break;
+	case 64:
+		writeq(value, virt_addr);
+		break;
+	default:
+		BUG();
+	}
+
+	if (unmap)
+		iounmap(virt_addr);
+	else
+		rcu_read_unlock();
+
+	return AE_OK;
+}
+
+#ifdef CONFIG_PCI
+acpi_status
+acpi_os_read_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
+			       u64 *value, u32 width)
+{
+	int result, size;
+	u32 value32;
+
+	if (!value)
+		return AE_BAD_PARAMETER;
+
+	switch (width) {
+	case 8:
+		size = 1;
+		break;
+	case 16:
+		size = 2;
+		break;
+	case 32:
+		size = 4;
+		break;
+	default:
+		return AE_ERROR;
+	}
+
+	result = raw_pci_read(pci_id->segment, pci_id->bus,
+				PCI_DEVFN(pci_id->device, pci_id->function),
+				reg, size, &value32);
+	*value = value32;
+
+	return (result ? AE_ERROR : AE_OK);
+}
+
+acpi_status
+acpi_os_write_pci_configuration(struct acpi_pci_id * pci_id, u32 reg,
+				u64 value, u32 width)
+{
+	int result, size;
+
+	switch (width) {
+	case 8:
+		size = 1;
+		break;
+	case 16:
+		size = 2;
+		break;
+	case 32:
+		size = 4;
+		break;
+	default:
+		return AE_ERROR;
+	}
+
+	result = raw_pci_write(pci_id->segment, pci_id->bus,
+				PCI_DEVFN(pci_id->device, pci_id->function),
+				reg, size, value);
+
+	return (result ? AE_ERROR : AE_OK);
+}
+#endif
+
+static void acpi_os_execute_deferred(struct work_struct *work)
+{
+	struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work);
+
+	dpc->function(dpc->context);
+	kfree(dpc);
+}
+
+#ifdef CONFIG_ACPI_DEBUGGER
+static struct acpi_debugger acpi_debugger;
+static bool acpi_debugger_initialized;
+
+int acpi_register_debugger(struct module *owner,
+			   const struct acpi_debugger_ops *ops)
+{
+	int ret = 0;
+
+	mutex_lock(&acpi_debugger.lock);
+	if (acpi_debugger.ops) {
+		ret = -EBUSY;
+		goto err_lock;
+	}
+
+	acpi_debugger.owner = owner;
+	acpi_debugger.ops = ops;
+
+err_lock:
+	mutex_unlock(&acpi_debugger.lock);
+	return ret;
+}
+EXPORT_SYMBOL(acpi_register_debugger);
+
+void acpi_unregister_debugger(const struct acpi_debugger_ops *ops)
+{
+	mutex_lock(&acpi_debugger.lock);
+	if (ops == acpi_debugger.ops) {
+		acpi_debugger.ops = NULL;
+		acpi_debugger.owner = NULL;
+	}
+	mutex_unlock(&acpi_debugger.lock);
+}
+EXPORT_SYMBOL(acpi_unregister_debugger);
+
+int acpi_debugger_create_thread(acpi_osd_exec_callback function, void *context)
+{
+	int ret;
+	int (*func)(acpi_osd_exec_callback, void *);
+	struct module *owner;
+
+	if (!acpi_debugger_initialized)
+		return -ENODEV;
+	mutex_lock(&acpi_debugger.lock);
+	if (!acpi_debugger.ops) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	if (!try_module_get(acpi_debugger.owner)) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	func = acpi_debugger.ops->create_thread;
+	owner = acpi_debugger.owner;
+	mutex_unlock(&acpi_debugger.lock);
+
+	ret = func(function, context);
+
+	mutex_lock(&acpi_debugger.lock);
+	module_put(owner);
+err_lock:
+	mutex_unlock(&acpi_debugger.lock);
+	return ret;
+}
+
+ssize_t acpi_debugger_write_log(const char *msg)
+{
+	ssize_t ret;
+	ssize_t (*func)(const char *);
+	struct module *owner;
+
+	if (!acpi_debugger_initialized)
+		return -ENODEV;
+	mutex_lock(&acpi_debugger.lock);
+	if (!acpi_debugger.ops) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	if (!try_module_get(acpi_debugger.owner)) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	func = acpi_debugger.ops->write_log;
+	owner = acpi_debugger.owner;
+	mutex_unlock(&acpi_debugger.lock);
+
+	ret = func(msg);
+
+	mutex_lock(&acpi_debugger.lock);
+	module_put(owner);
+err_lock:
+	mutex_unlock(&acpi_debugger.lock);
+	return ret;
+}
+
+ssize_t acpi_debugger_read_cmd(char *buffer, size_t buffer_length)
+{
+	ssize_t ret;
+	ssize_t (*func)(char *, size_t);
+	struct module *owner;
+
+	if (!acpi_debugger_initialized)
+		return -ENODEV;
+	mutex_lock(&acpi_debugger.lock);
+	if (!acpi_debugger.ops) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	if (!try_module_get(acpi_debugger.owner)) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	func = acpi_debugger.ops->read_cmd;
+	owner = acpi_debugger.owner;
+	mutex_unlock(&acpi_debugger.lock);
+
+	ret = func(buffer, buffer_length);
+
+	mutex_lock(&acpi_debugger.lock);
+	module_put(owner);
+err_lock:
+	mutex_unlock(&acpi_debugger.lock);
+	return ret;
+}
+
+int acpi_debugger_wait_command_ready(void)
+{
+	int ret;
+	int (*func)(bool, char *, size_t);
+	struct module *owner;
+
+	if (!acpi_debugger_initialized)
+		return -ENODEV;
+	mutex_lock(&acpi_debugger.lock);
+	if (!acpi_debugger.ops) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	if (!try_module_get(acpi_debugger.owner)) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	func = acpi_debugger.ops->wait_command_ready;
+	owner = acpi_debugger.owner;
+	mutex_unlock(&acpi_debugger.lock);
+
+	ret = func(acpi_gbl_method_executing,
+		   acpi_gbl_db_line_buf, ACPI_DB_LINE_BUFFER_SIZE);
+
+	mutex_lock(&acpi_debugger.lock);
+	module_put(owner);
+err_lock:
+	mutex_unlock(&acpi_debugger.lock);
+	return ret;
+}
+
+int acpi_debugger_notify_command_complete(void)
+{
+	int ret;
+	int (*func)(void);
+	struct module *owner;
+
+	if (!acpi_debugger_initialized)
+		return -ENODEV;
+	mutex_lock(&acpi_debugger.lock);
+	if (!acpi_debugger.ops) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	if (!try_module_get(acpi_debugger.owner)) {
+		ret = -ENODEV;
+		goto err_lock;
+	}
+	func = acpi_debugger.ops->notify_command_complete;
+	owner = acpi_debugger.owner;
+	mutex_unlock(&acpi_debugger.lock);
+
+	ret = func();
+
+	mutex_lock(&acpi_debugger.lock);
+	module_put(owner);
+err_lock:
+	mutex_unlock(&acpi_debugger.lock);
+	return ret;
+}
+
+int __init acpi_debugger_init(void)
+{
+	mutex_init(&acpi_debugger.lock);
+	acpi_debugger_initialized = true;
+	return 0;
+}
+#endif
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_os_execute
+ *
+ * PARAMETERS:  Type               - Type of the callback
+ *              Function           - Function to be executed
+ *              Context            - Function parameters
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Depending on type, either queues function for deferred execution or
+ *              immediately executes function on a separate thread.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_os_execute(acpi_execute_type type,
+			    acpi_osd_exec_callback function, void *context)
+{
+	acpi_status status = AE_OK;
+	struct acpi_os_dpc *dpc;
+	struct workqueue_struct *queue;
+	int ret;
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+			  "Scheduling function [%p(%p)] for deferred execution.\n",
+			  function, context));
+
+	if (type == OSL_DEBUGGER_MAIN_THREAD) {
+		ret = acpi_debugger_create_thread(function, context);
+		if (ret) {
+			pr_err("Kernel thread creation failed\n");
+			status = AE_ERROR;
+		}
+		goto out_thread;
+	}
+
+	/*
+	 * Allocate/initialize DPC structure.  Note that this memory will be
+	 * freed by the callee.  The kernel handles the work_struct list  in a
+	 * way that allows us to also free its memory inside the callee.
+	 * Because we may want to schedule several tasks with different
+	 * parameters we can't use the approach some kernel code uses of
+	 * having a static work_struct.
+	 */
+
+	dpc = kzalloc(sizeof(struct acpi_os_dpc), GFP_ATOMIC);
+	if (!dpc)
+		return AE_NO_MEMORY;
+
+	dpc->function = function;
+	dpc->context = context;
+
+	/*
+	 * To prevent lockdep from complaining unnecessarily, make sure that
+	 * there is a different static lockdep key for each workqueue by using
+	 * INIT_WORK() for each of them separately.
+	 */
+	if (type == OSL_NOTIFY_HANDLER) {
+		queue = kacpi_notify_wq;
+		INIT_WORK(&dpc->work, acpi_os_execute_deferred);
+	} else if (type == OSL_GPE_HANDLER) {
+		queue = kacpid_wq;
+		INIT_WORK(&dpc->work, acpi_os_execute_deferred);
+	} else {
+		pr_err("Unsupported os_execute type %d.\n", type);
+		status = AE_ERROR;
+	}
+
+	if (ACPI_FAILURE(status))
+		goto err_workqueue;
+
+	/*
+	 * On some machines, a software-initiated SMI causes corruption unless
+	 * the SMI runs on CPU 0.  An SMI can be initiated by any AML, but
+	 * typically it's done in GPE-related methods that are run via
+	 * workqueues, so we can avoid the known corruption cases by always
+	 * queueing on CPU 0.
+	 */
+	ret = queue_work_on(0, queue, &dpc->work);
+	if (!ret) {
+		pr_err("Unable to queue work\n");
+		status = AE_ERROR;
+	}
+err_workqueue:
+	if (ACPI_FAILURE(status))
+		kfree(dpc);
+out_thread:
+	return status;
+}
+EXPORT_SYMBOL(acpi_os_execute);
+
+void acpi_os_wait_events_complete(void)
+{
+	/*
+	 * Make sure the GPE handler or the fixed event handler is not used
+	 * on another CPU after removal.
+	 */
+	if (acpi_sci_irq_valid())
+		synchronize_hardirq(acpi_sci_irq);
+	flush_workqueue(kacpid_wq);
+	flush_workqueue(kacpi_notify_wq);
+}
+EXPORT_SYMBOL(acpi_os_wait_events_complete);
+
+struct acpi_hp_work {
+	struct work_struct work;
+	struct acpi_device *adev;
+	u32 src;
+};
+
+static void acpi_hotplug_work_fn(struct work_struct *work)
+{
+	struct acpi_hp_work *hpw = container_of(work, struct acpi_hp_work, work);
+
+	acpi_os_wait_events_complete();
+	acpi_device_hotplug(hpw->adev, hpw->src);
+	kfree(hpw);
+}
+
+acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src)
+{
+	struct acpi_hp_work *hpw;
+
+	acpi_handle_debug(adev->handle,
+			  "Scheduling hotplug event %u for deferred handling\n",
+			   src);
+
+	hpw = kmalloc(sizeof(*hpw), GFP_KERNEL);
+	if (!hpw)
+		return AE_NO_MEMORY;
+
+	INIT_WORK(&hpw->work, acpi_hotplug_work_fn);
+	hpw->adev = adev;
+	hpw->src = src;
+	/*
+	 * We can't run hotplug code in kacpid_wq/kacpid_notify_wq etc., because
+	 * the hotplug code may call driver .remove() functions, which may
+	 * invoke flush_scheduled_work()/acpi_os_wait_events_complete() to flush
+	 * these workqueues.
+	 */
+	if (!queue_work(kacpi_hotplug_wq, &hpw->work)) {
+		kfree(hpw);
+		return AE_ERROR;
+	}
+	return AE_OK;
+}
+
+bool acpi_queue_hotplug_work(struct work_struct *work)
+{
+	return queue_work(kacpi_hotplug_wq, work);
+}
+
+acpi_status
+acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)
+{
+	struct semaphore *sem = NULL;
+
+	sem = acpi_os_allocate_zeroed(sizeof(struct semaphore));
+	if (!sem)
+		return AE_NO_MEMORY;
+
+	sema_init(sem, initial_units);
+
+	*handle = (acpi_handle *) sem;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Creating semaphore[%p|%d].\n",
+			  *handle, initial_units));
+
+	return AE_OK;
+}
+
+/*
+ * TODO: A better way to delete semaphores?  Linux doesn't have a
+ * 'delete_semaphore()' function -- may result in an invalid
+ * pointer dereference for non-synchronized consumers.	Should
+ * we at least check for blocked threads and signal/cancel them?
+ */
+
+acpi_status acpi_os_delete_semaphore(acpi_handle handle)
+{
+	struct semaphore *sem = (struct semaphore *)handle;
+
+	if (!sem)
+		return AE_BAD_PARAMETER;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Deleting semaphore[%p].\n", handle));
+
+	BUG_ON(!list_empty(&sem->wait_list));
+	kfree(sem);
+	sem = NULL;
+
+	return AE_OK;
+}
+
+/*
+ * TODO: Support for units > 1?
+ */
+acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
+{
+	acpi_status status = AE_OK;
+	struct semaphore *sem = (struct semaphore *)handle;
+	long jiffies;
+	int ret = 0;
+
+	if (!acpi_os_initialized)
+		return AE_OK;
+
+	if (!sem || (units < 1))
+		return AE_BAD_PARAMETER;
+
+	if (units > 1)
+		return AE_SUPPORT;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
+			  handle, units, timeout));
+
+	if (timeout == ACPI_WAIT_FOREVER)
+		jiffies = MAX_SCHEDULE_TIMEOUT;
+	else
+		jiffies = msecs_to_jiffies(timeout);
+
+	ret = down_timeout(sem, jiffies);
+	if (ret)
+		status = AE_TIME;
+
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
+				  "Failed to acquire semaphore[%p|%d|%d], %s",
+				  handle, units, timeout,
+				  acpi_format_exception(status)));
+	} else {
+		ACPI_DEBUG_PRINT((ACPI_DB_MUTEX,
+				  "Acquired semaphore[%p|%d|%d]", handle,
+				  units, timeout));
+	}
+
+	return status;
+}
+
+/*
+ * TODO: Support for units > 1?
+ */
+acpi_status acpi_os_signal_semaphore(acpi_handle handle, u32 units)
+{
+	struct semaphore *sem = (struct semaphore *)handle;
+
+	if (!acpi_os_initialized)
+		return AE_OK;
+
+	if (!sem || (units < 1))
+		return AE_BAD_PARAMETER;
+
+	if (units > 1)
+		return AE_SUPPORT;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Signaling semaphore[%p|%d]\n", handle,
+			  units));
+
+	up(sem);
+
+	return AE_OK;
+}
+
+acpi_status acpi_os_get_line(char *buffer, u32 buffer_length, u32 *bytes_read)
+{
+#ifdef ENABLE_DEBUGGER
+	if (acpi_in_debugger) {
+		u32 chars;
+
+		kdb_read(buffer, buffer_length);
+
+		/* remove the CR kdb includes */
+		chars = strlen(buffer) - 1;
+		buffer[chars] = '\0';
+	}
+#else
+	int ret;
+
+	ret = acpi_debugger_read_cmd(buffer, buffer_length);
+	if (ret < 0)
+		return AE_ERROR;
+	if (bytes_read)
+		*bytes_read = ret;
+#endif
+
+	return AE_OK;
+}
+EXPORT_SYMBOL(acpi_os_get_line);
+
+acpi_status acpi_os_wait_command_ready(void)
+{
+	int ret;
+
+	ret = acpi_debugger_wait_command_ready();
+	if (ret < 0)
+		return AE_ERROR;
+	return AE_OK;
+}
+
+acpi_status acpi_os_notify_command_complete(void)
+{
+	int ret;
+
+	ret = acpi_debugger_notify_command_complete();
+	if (ret < 0)
+		return AE_ERROR;
+	return AE_OK;
+}
+
+acpi_status acpi_os_signal(u32 function, void *info)
+{
+	switch (function) {
+	case ACPI_SIGNAL_FATAL:
+		pr_err("Fatal opcode executed\n");
+		break;
+	case ACPI_SIGNAL_BREAKPOINT:
+		/*
+		 * AML Breakpoint
+		 * ACPI spec. says to treat it as a NOP unless
+		 * you are debugging.  So if/when we integrate
+		 * AML debugger into the kernel debugger its
+		 * hook will go here.  But until then it is
+		 * not useful to print anything on breakpoints.
+		 */
+		break;
+	default:
+		break;
+	}
+
+	return AE_OK;
+}
+
+static int __init acpi_os_name_setup(char *str)
+{
+	char *p = acpi_os_name;
+	int count = ACPI_MAX_OVERRIDE_LEN - 1;
+
+	if (!str || !*str)
+		return 0;
+
+	for (; count-- && *str; str++) {
+		if (isalnum(*str) || *str == ' ' || *str == ':')
+			*p++ = *str;
+		else if (*str == '\'' || *str == '"')
+			continue;
+		else
+			break;
+	}
+	*p = 0;
+
+	return 1;
+
+}
+
+__setup("acpi_os_name=", acpi_os_name_setup);
+
+/*
+ * Disable the auto-serialization of named objects creation methods.
+ *
+ * This feature is enabled by default.  It marks the AML control methods
+ * that contain the opcodes to create named objects as "Serialized".
+ */
+static int __init acpi_no_auto_serialize_setup(char *str)
+{
+	acpi_gbl_auto_serialize_methods = FALSE;
+	pr_info("Auto-serialization disabled\n");
+
+	return 1;
+}
+
+__setup("acpi_no_auto_serialize", acpi_no_auto_serialize_setup);
+
+/* Check of resource interference between native drivers and ACPI
+ * OperationRegions (SystemIO and System Memory only).
+ * IO ports and memory declared in ACPI might be used by the ACPI subsystem
+ * in arbitrary AML code and can interfere with legacy drivers.
+ * acpi_enforce_resources= can be set to:
+ *
+ *   - strict (default) (2)
+ *     -> further driver trying to access the resources will not load
+ *   - lax              (1)
+ *     -> further driver trying to access the resources will load, but you
+ *     get a system message that something might go wrong...
+ *
+ *   - no               (0)
+ *     -> ACPI Operation Region resources will not be registered
+ *
+ */
+#define ENFORCE_RESOURCES_STRICT 2
+#define ENFORCE_RESOURCES_LAX    1
+#define ENFORCE_RESOURCES_NO     0
+
+static unsigned int acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
+
+static int __init acpi_enforce_resources_setup(char *str)
+{
+	if (str == NULL || *str == '\0')
+		return 0;
+
+	if (!strcmp("strict", str))
+		acpi_enforce_resources = ENFORCE_RESOURCES_STRICT;
+	else if (!strcmp("lax", str))
+		acpi_enforce_resources = ENFORCE_RESOURCES_LAX;
+	else if (!strcmp("no", str))
+		acpi_enforce_resources = ENFORCE_RESOURCES_NO;
+
+	return 1;
+}
+
+__setup("acpi_enforce_resources=", acpi_enforce_resources_setup);
+
+/* Check for resource conflicts between ACPI OperationRegions and native
+ * drivers */
+int acpi_check_resource_conflict(const struct resource *res)
+{
+	acpi_adr_space_type space_id;
+
+	if (acpi_enforce_resources == ENFORCE_RESOURCES_NO)
+		return 0;
+
+	if (res->flags & IORESOURCE_IO)
+		space_id = ACPI_ADR_SPACE_SYSTEM_IO;
+	else if (res->flags & IORESOURCE_MEM)
+		space_id = ACPI_ADR_SPACE_SYSTEM_MEMORY;
+	else
+		return 0;
+
+	if (!acpi_check_address_range(space_id, res->start, resource_size(res), 1))
+		return 0;
+
+	pr_info("Resource conflict; ACPI support missing from driver?\n");
+
+	if (acpi_enforce_resources == ENFORCE_RESOURCES_STRICT)
+		return -EBUSY;
+
+	if (acpi_enforce_resources == ENFORCE_RESOURCES_LAX)
+		pr_notice("Resource conflict: System may be unstable or behave erratically\n");
+
+	return 0;
+}
+EXPORT_SYMBOL(acpi_check_resource_conflict);
+
+int acpi_check_region(resource_size_t start, resource_size_t n,
+		      const char *name)
+{
+	struct resource res = DEFINE_RES_IO_NAMED(start, n, name);
+
+	return acpi_check_resource_conflict(&res);
+}
+EXPORT_SYMBOL(acpi_check_region);
+
+/*
+ * Let drivers know whether the resource checks are effective
+ */
+int acpi_resources_are_enforced(void)
+{
+	return acpi_enforce_resources == ENFORCE_RESOURCES_STRICT;
+}
+EXPORT_SYMBOL(acpi_resources_are_enforced);
+
+/*
+ * Deallocate the memory for a spinlock.
+ */
+void acpi_os_delete_lock(acpi_spinlock handle)
+{
+	ACPI_FREE(handle);
+}
+
+/*
+ * Acquire a spinlock.
+ *
+ * handle is a pointer to the spinlock_t.
+ */
+
+acpi_cpu_flags acpi_os_acquire_lock(acpi_spinlock lockp)
+	__acquires(lockp)
+{
+	acpi_cpu_flags flags;
+	spin_lock_irqsave(lockp, flags);
+	return flags;
+}
+
+/*
+ * Release a spinlock. See above.
+ */
+
+void acpi_os_release_lock(acpi_spinlock lockp, acpi_cpu_flags flags)
+	__releases(lockp)
+{
+	spin_unlock_irqrestore(lockp, flags);
+}
+
+#ifndef ACPI_USE_LOCAL_CACHE
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_os_create_cache
+ *
+ * PARAMETERS:  name      - Ascii name for the cache
+ *              size      - Size of each cached object
+ *              depth     - Maximum depth of the cache (in objects) <ignored>
+ *              cache     - Where the new cache object is returned
+ *
+ * RETURN:      status
+ *
+ * DESCRIPTION: Create a cache object
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_os_create_cache(char *name, u16 size, u16 depth, acpi_cache_t ** cache)
+{
+	*cache = kmem_cache_create(name, size, 0, 0, NULL);
+	if (*cache == NULL)
+		return AE_ERROR;
+	else
+		return AE_OK;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_os_purge_cache
+ *
+ * PARAMETERS:  Cache           - Handle to cache object
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Free all objects within the requested cache.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_os_purge_cache(acpi_cache_t * cache)
+{
+	kmem_cache_shrink(cache);
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_os_delete_cache
+ *
+ * PARAMETERS:  Cache           - Handle to cache object
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Free all objects within the requested cache and delete the
+ *              cache object.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_os_delete_cache(acpi_cache_t * cache)
+{
+	kmem_cache_destroy(cache);
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_os_release_object
+ *
+ * PARAMETERS:  Cache       - Handle to cache object
+ *              Object      - The object to be released
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Release an object to the specified cache.  If cache is full,
+ *              the object is deleted.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object)
+{
+	kmem_cache_free(cache, object);
+	return (AE_OK);
+}
+#endif
+
+static int __init acpi_no_static_ssdt_setup(char *s)
+{
+	acpi_gbl_disable_ssdt_table_install = TRUE;
+	pr_info("Static SSDT installation disabled\n");
+
+	return 0;
+}
+
+early_param("acpi_no_static_ssdt", acpi_no_static_ssdt_setup);
+
+static int __init acpi_disable_return_repair(char *s)
+{
+	pr_notice("Predefined validation mechanism disabled\n");
+	acpi_gbl_disable_auto_repair = TRUE;
+
+	return 1;
+}
+
+__setup("acpica_no_return_repair", acpi_disable_return_repair);
+
+acpi_status __init acpi_os_initialize(void)
+{
+	acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
+	acpi_os_map_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
+
+	acpi_gbl_xgpe0_block_logical_address =
+		(unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe0_block);
+	acpi_gbl_xgpe1_block_logical_address =
+		(unsigned long)acpi_os_map_generic_address(&acpi_gbl_FADT.xgpe1_block);
+
+	if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) {
+		/*
+		 * Use acpi_os_map_generic_address to pre-map the reset
+		 * register if it's in system memory.
+		 */
+		void *rv;
+
+		rv = acpi_os_map_generic_address(&acpi_gbl_FADT.reset_register);
+		pr_debug("%s: Reset register mapping %s\n", __func__,
+			 rv ? "successful" : "failed");
+	}
+	acpi_os_initialized = true;
+
+	return AE_OK;
+}
+
+acpi_status __init acpi_os_initialize1(void)
+{
+	kacpid_wq = alloc_workqueue("kacpid", 0, 1);
+	kacpi_notify_wq = alloc_workqueue("kacpi_notify", 0, 1);
+	kacpi_hotplug_wq = alloc_ordered_workqueue("kacpi_hotplug", 0);
+	BUG_ON(!kacpid_wq);
+	BUG_ON(!kacpi_notify_wq);
+	BUG_ON(!kacpi_hotplug_wq);
+	acpi_osi_init();
+	return AE_OK;
+}
+
+acpi_status acpi_os_terminate(void)
+{
+	if (acpi_irq_handler) {
+		acpi_os_remove_interrupt_handler(acpi_gbl_FADT.sci_interrupt,
+						 acpi_irq_handler);
+	}
+
+	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe1_block);
+	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xgpe0_block);
+	acpi_gbl_xgpe0_block_logical_address = 0UL;
+	acpi_gbl_xgpe1_block_logical_address = 0UL;
+
+	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1b_event_block);
+	acpi_os_unmap_generic_address(&acpi_gbl_FADT.xpm1a_event_block);
+
+	if (acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER)
+		acpi_os_unmap_generic_address(&acpi_gbl_FADT.reset_register);
+
+	destroy_workqueue(kacpid_wq);
+	destroy_workqueue(kacpi_notify_wq);
+	destroy_workqueue(kacpi_hotplug_wq);
+
+	return AE_OK;
+}
+
+acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,
+				  u32 pm1b_control)
+{
+	int rc = 0;
+	if (__acpi_os_prepare_sleep)
+		rc = __acpi_os_prepare_sleep(sleep_state,
+					     pm1a_control, pm1b_control);
+	if (rc < 0)
+		return AE_ERROR;
+	else if (rc > 0)
+		return AE_CTRL_TERMINATE;
+
+	return AE_OK;
+}
+
+void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
+			       u32 pm1a_ctrl, u32 pm1b_ctrl))
+{
+	__acpi_os_prepare_sleep = func;
+}
+
+#if (ACPI_REDUCED_HARDWARE)
+acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
+				  u32 val_b)
+{
+	int rc = 0;
+	if (__acpi_os_prepare_extended_sleep)
+		rc = __acpi_os_prepare_extended_sleep(sleep_state,
+					     val_a, val_b);
+	if (rc < 0)
+		return AE_ERROR;
+	else if (rc > 0)
+		return AE_CTRL_TERMINATE;
+
+	return AE_OK;
+}
+#else
+acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
+				  u32 val_b)
+{
+	return AE_OK;
+}
+#endif
+
+void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
+			       u32 val_a, u32 val_b))
+{
+	__acpi_os_prepare_extended_sleep = func;
+}
+
+acpi_status acpi_os_enter_sleep(u8 sleep_state,
+				u32 reg_a_value, u32 reg_b_value)
+{
+	acpi_status status;
+
+	if (acpi_gbl_reduced_hardware)
+		status = acpi_os_prepare_extended_sleep(sleep_state,
+							reg_a_value,
+							reg_b_value);
+	else
+		status = acpi_os_prepare_sleep(sleep_state,
+					       reg_a_value, reg_b_value);
+	return status;
+}