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, 723 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/dswstate.c b/drivers/acpi/acpica/dswstate.c
new file mode 100644
index 000000000..0aa735d3b
--- /dev/null
+++ b/drivers/acpi/acpica/dswstate.c
@@ -0,0 +1,723 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: dswstate - Dispatcher parse tree walk management routines
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acparser.h"
+#include "acdispat.h"
+#include "acnamesp.h"
+
+#define _COMPONENT          ACPI_DISPATCHER
+ACPI_MODULE_NAME("dswstate")
+
+  /* Local prototypes */
+static acpi_status
+acpi_ds_result_stack_push(struct acpi_walk_state *walk_state);
+static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_result_pop
+ *
+ * PARAMETERS:  object              - Where to return the popped object
+ *              walk_state          - Current Walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Pop an object off the top of this walk's result stack
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_result_pop(union acpi_operand_object **object,
+		   struct acpi_walk_state *walk_state)
+{
+	u32 index;
+	union acpi_generic_state *state;
+	acpi_status status;
+
+	ACPI_FUNCTION_NAME(ds_result_pop);
+
+	state = walk_state->results;
+
+	/* Incorrect state of result stack */
+
+	if (state && !walk_state->result_count) {
+		ACPI_ERROR((AE_INFO, "No results on result stack"));
+		return (AE_AML_INTERNAL);
+	}
+
+	if (!state && walk_state->result_count) {
+		ACPI_ERROR((AE_INFO, "No result state for result stack"));
+		return (AE_AML_INTERNAL);
+	}
+
+	/* Empty result stack */
+
+	if (!state) {
+		ACPI_ERROR((AE_INFO, "Result stack is empty! State=%p",
+			    walk_state));
+		return (AE_AML_NO_RETURN_VALUE);
+	}
+
+	/* Return object of the top element and clean that top element result stack */
+
+	walk_state->result_count--;
+	index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
+
+	*object = state->results.obj_desc[index];
+	if (!*object) {
+		ACPI_ERROR((AE_INFO,
+			    "No result objects on result stack, State=%p",
+			    walk_state));
+		return (AE_AML_NO_RETURN_VALUE);
+	}
+
+	state->results.obj_desc[index] = NULL;
+	if (index == 0) {
+		status = acpi_ds_result_stack_pop(walk_state);
+		if (ACPI_FAILURE(status)) {
+			return (status);
+		}
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+			  "Obj=%p [%s] Index=%X State=%p Num=%X\n", *object,
+			  acpi_ut_get_object_type_name(*object),
+			  index, walk_state, walk_state->result_count));
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_result_push
+ *
+ * PARAMETERS:  object              - Where to return the popped object
+ *              walk_state          - Current Walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Push an object onto the current result stack
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_result_push(union acpi_operand_object *object,
+		    struct acpi_walk_state *walk_state)
+{
+	union acpi_generic_state *state;
+	acpi_status status;
+	u32 index;
+
+	ACPI_FUNCTION_NAME(ds_result_push);
+
+	if (walk_state->result_count > walk_state->result_size) {
+		ACPI_ERROR((AE_INFO, "Result stack is full"));
+		return (AE_AML_INTERNAL);
+	} else if (walk_state->result_count == walk_state->result_size) {
+
+		/* Extend the result stack */
+
+		status = acpi_ds_result_stack_push(walk_state);
+		if (ACPI_FAILURE(status)) {
+			ACPI_ERROR((AE_INFO,
+				    "Failed to extend the result stack"));
+			return (status);
+		}
+	}
+
+	if (!(walk_state->result_count < walk_state->result_size)) {
+		ACPI_ERROR((AE_INFO, "No free elements in result stack"));
+		return (AE_AML_INTERNAL);
+	}
+
+	state = walk_state->results;
+	if (!state) {
+		ACPI_ERROR((AE_INFO, "No result stack frame during push"));
+		return (AE_AML_INTERNAL);
+	}
+
+	if (!object) {
+		ACPI_ERROR((AE_INFO,
+			    "Null Object! Obj=%p State=%p Num=%u",
+			    object, walk_state, walk_state->result_count));
+		return (AE_BAD_PARAMETER);
+	}
+
+	/* Assign the address of object to the top free element of result stack */
+
+	index = (u32)walk_state->result_count % ACPI_RESULTS_FRAME_OBJ_NUM;
+	state->results.obj_desc[index] = object;
+	walk_state->result_count++;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p Num=%X Cur=%X\n",
+			  object,
+			  acpi_ut_get_object_type_name((union
+							acpi_operand_object *)
+						       object), walk_state,
+			  walk_state->result_count,
+			  walk_state->current_result));
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_result_stack_push
+ *
+ * PARAMETERS:  walk_state          - Current Walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Push an object onto the walk_state result stack
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ds_result_stack_push(struct acpi_walk_state *walk_state)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_NAME(ds_result_stack_push);
+
+	/* Check for stack overflow */
+
+	if (((u32) walk_state->result_size + ACPI_RESULTS_FRAME_OBJ_NUM) >
+	    ACPI_RESULTS_OBJ_NUM_MAX) {
+		ACPI_ERROR((AE_INFO, "Result stack overflow: State=%p Num=%u",
+			    walk_state, walk_state->result_size));
+		return (AE_STACK_OVERFLOW);
+	}
+
+	state = acpi_ut_create_generic_state();
+	if (!state) {
+		return (AE_NO_MEMORY);
+	}
+
+	state->common.descriptor_type = ACPI_DESC_TYPE_STATE_RESULT;
+	acpi_ut_push_generic_state(&walk_state->results, state);
+
+	/* Increase the length of the result stack by the length of frame */
+
+	walk_state->result_size += ACPI_RESULTS_FRAME_OBJ_NUM;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Results=%p State=%p\n",
+			  state, walk_state));
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_result_stack_pop
+ *
+ * PARAMETERS:  walk_state          - Current Walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Pop an object off of the walk_state result stack
+ *
+ ******************************************************************************/
+
+static acpi_status acpi_ds_result_stack_pop(struct acpi_walk_state *walk_state)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_NAME(ds_result_stack_pop);
+
+	/* Check for stack underflow */
+
+	if (walk_state->results == NULL) {
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "Result stack underflow - State=%p\n",
+				  walk_state));
+		return (AE_AML_NO_OPERAND);
+	}
+
+	if (walk_state->result_size < ACPI_RESULTS_FRAME_OBJ_NUM) {
+		ACPI_ERROR((AE_INFO, "Insufficient result stack size"));
+		return (AE_AML_INTERNAL);
+	}
+
+	state = acpi_ut_pop_generic_state(&walk_state->results);
+	acpi_ut_delete_generic_state(state);
+
+	/* Decrease the length of result stack by the length of frame */
+
+	walk_state->result_size -= ACPI_RESULTS_FRAME_OBJ_NUM;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+			  "Result=%p RemainingResults=%X State=%p\n",
+			  state, walk_state->result_count, walk_state));
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_obj_stack_push
+ *
+ * PARAMETERS:  object              - Object to push
+ *              walk_state          - Current Walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Push an object onto this walk's object/operand stack
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_obj_stack_push(void *object, struct acpi_walk_state *walk_state)
+{
+	ACPI_FUNCTION_NAME(ds_obj_stack_push);
+
+	/* Check for stack overflow */
+
+	if (walk_state->num_operands >= ACPI_OBJ_NUM_OPERANDS) {
+		ACPI_ERROR((AE_INFO,
+			    "Object stack overflow! Obj=%p State=%p #Ops=%u",
+			    object, walk_state, walk_state->num_operands));
+		return (AE_STACK_OVERFLOW);
+	}
+
+	/* Put the object onto the stack */
+
+	walk_state->operands[walk_state->operand_index] = object;
+	walk_state->num_operands++;
+
+	/* For the usual order of filling the operand stack */
+
+	walk_state->operand_index++;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Obj=%p [%s] State=%p #Ops=%X\n",
+			  object,
+			  acpi_ut_get_object_type_name((union
+							acpi_operand_object *)
+						       object), walk_state,
+			  walk_state->num_operands));
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_obj_stack_pop
+ *
+ * PARAMETERS:  pop_count           - Number of objects/entries to pop
+ *              walk_state          - Current Walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Pop this walk's object stack. Objects on the stack are NOT
+ *              deleted by this routine.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_obj_stack_pop(u32 pop_count, struct acpi_walk_state *walk_state)
+{
+	u32 i;
+
+	ACPI_FUNCTION_NAME(ds_obj_stack_pop);
+
+	for (i = 0; i < pop_count; i++) {
+
+		/* Check for stack underflow */
+
+		if (walk_state->num_operands == 0) {
+			ACPI_ERROR((AE_INFO,
+				    "Object stack underflow! Count=%X State=%p #Ops=%u",
+				    pop_count, walk_state,
+				    walk_state->num_operands));
+			return (AE_STACK_UNDERFLOW);
+		}
+
+		/* Just set the stack entry to null */
+
+		walk_state->num_operands--;
+		walk_state->operands[walk_state->num_operands] = NULL;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%u\n",
+			  pop_count, walk_state, walk_state->num_operands));
+
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_obj_stack_pop_and_delete
+ *
+ * PARAMETERS:  pop_count           - Number of objects/entries to pop
+ *              walk_state          - Current Walk state
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Pop this walk's object stack and delete each object that is
+ *              popped off.
+ *
+ ******************************************************************************/
+
+void
+acpi_ds_obj_stack_pop_and_delete(u32 pop_count,
+				 struct acpi_walk_state *walk_state)
+{
+	s32 i;
+	union acpi_operand_object *obj_desc;
+
+	ACPI_FUNCTION_NAME(ds_obj_stack_pop_and_delete);
+
+	if (pop_count == 0) {
+		return;
+	}
+
+	for (i = (s32)pop_count - 1; i >= 0; i--) {
+		if (walk_state->num_operands == 0) {
+			return;
+		}
+
+		/* Pop the stack and delete an object if present in this stack entry */
+
+		walk_state->num_operands--;
+		obj_desc = walk_state->operands[i];
+		if (obj_desc) {
+			acpi_ut_remove_reference(walk_state->operands[i]);
+			walk_state->operands[i] = NULL;
+		}
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Count=%X State=%p #Ops=%X\n",
+			  pop_count, walk_state, walk_state->num_operands));
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_get_current_walk_state
+ *
+ * PARAMETERS:  thread          - Get current active state for this Thread
+ *
+ * RETURN:      Pointer to the current walk state
+ *
+ * DESCRIPTION: Get the walk state that is at the head of the list (the "current"
+ *              walk state.)
+ *
+ ******************************************************************************/
+
+struct acpi_walk_state *acpi_ds_get_current_walk_state(struct acpi_thread_state
+						       *thread)
+{
+	ACPI_FUNCTION_NAME(ds_get_current_walk_state);
+
+	if (!thread) {
+		return (NULL);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_PARSE, "Current WalkState %p\n",
+			  thread->walk_state_list));
+
+	return (thread->walk_state_list);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_push_walk_state
+ *
+ * PARAMETERS:  walk_state      - State to push
+ *              thread          - Thread state object
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Place the Thread state at the head of the state list
+ *
+ ******************************************************************************/
+
+void
+acpi_ds_push_walk_state(struct acpi_walk_state *walk_state,
+			struct acpi_thread_state *thread)
+{
+	ACPI_FUNCTION_TRACE(ds_push_walk_state);
+
+	walk_state->next = thread->walk_state_list;
+	thread->walk_state_list = walk_state;
+
+	return_VOID;
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_pop_walk_state
+ *
+ * PARAMETERS:  thread      - Current thread state
+ *
+ * RETURN:      A walk_state object popped from the thread's stack
+ *
+ * DESCRIPTION: Remove and return the walkstate object that is at the head of
+ *              the walk stack for the given walk list. NULL indicates that
+ *              the list is empty.
+ *
+ ******************************************************************************/
+
+struct acpi_walk_state *acpi_ds_pop_walk_state(struct acpi_thread_state *thread)
+{
+	struct acpi_walk_state *walk_state;
+
+	ACPI_FUNCTION_TRACE(ds_pop_walk_state);
+
+	walk_state = thread->walk_state_list;
+
+	if (walk_state) {
+
+		/* Next walk state becomes the current walk state */
+
+		thread->walk_state_list = walk_state->next;
+
+		/*
+		 * Don't clear the NEXT field, this serves as an indicator
+		 * that there is a parent WALK STATE
+		 * Do Not: walk_state->Next = NULL;
+		 */
+	}
+
+	return_PTR(walk_state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_create_walk_state
+ *
+ * PARAMETERS:  owner_id        - ID for object creation
+ *              origin          - Starting point for this walk
+ *              method_desc     - Method object
+ *              thread          - Current thread state
+ *
+ * RETURN:      Pointer to the new walk state.
+ *
+ * DESCRIPTION: Allocate and initialize a new walk state. The current walk
+ *              state is set to this new state.
+ *
+ ******************************************************************************/
+
+struct acpi_walk_state *acpi_ds_create_walk_state(acpi_owner_id owner_id,
+						  union acpi_parse_object
+						  *origin,
+						  union acpi_operand_object
+						  *method_desc,
+						  struct acpi_thread_state
+						  *thread)
+{
+	struct acpi_walk_state *walk_state;
+
+	ACPI_FUNCTION_TRACE(ds_create_walk_state);
+
+	walk_state = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_walk_state));
+	if (!walk_state) {
+		return_PTR(NULL);
+	}
+
+	walk_state->descriptor_type = ACPI_DESC_TYPE_WALK;
+	walk_state->method_desc = method_desc;
+	walk_state->owner_id = owner_id;
+	walk_state->origin = origin;
+	walk_state->thread = thread;
+
+	walk_state->parser_state.start_op = origin;
+
+	/* Init the method args/local */
+
+#ifndef ACPI_CONSTANT_EVAL_ONLY
+	acpi_ds_method_data_init(walk_state);
+#endif
+
+	/* Put the new state at the head of the walk list */
+
+	if (thread) {
+		acpi_ds_push_walk_state(walk_state, thread);
+	}
+
+	return_PTR(walk_state);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_init_aml_walk
+ *
+ * PARAMETERS:  walk_state      - New state to be initialized
+ *              op              - Current parse op
+ *              method_node     - Control method NS node, if any
+ *              aml_start       - Start of AML
+ *              aml_length      - Length of AML
+ *              info            - Method info block (params, etc.)
+ *              pass_number     - 1, 2, or 3
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Initialize a walk state for a pass 1 or 2 parse tree walk
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ds_init_aml_walk(struct acpi_walk_state *walk_state,
+		      union acpi_parse_object *op,
+		      struct acpi_namespace_node *method_node,
+		      u8 * aml_start,
+		      u32 aml_length,
+		      struct acpi_evaluate_info *info, u8 pass_number)
+{
+	acpi_status status;
+	struct acpi_parse_state *parser_state = &walk_state->parser_state;
+	union acpi_parse_object *extra_op;
+
+	ACPI_FUNCTION_TRACE(ds_init_aml_walk);
+
+	walk_state->parser_state.aml =
+	    walk_state->parser_state.aml_start = aml_start;
+	walk_state->parser_state.aml_end =
+	    walk_state->parser_state.pkg_end = aml_start + aml_length;
+
+	/* The next_op of the next_walk will be the beginning of the method */
+
+	walk_state->next_op = NULL;
+	walk_state->pass_number = pass_number;
+
+	if (info) {
+		walk_state->params = info->parameters;
+		walk_state->caller_return_desc = &info->return_object;
+	}
+
+	status = acpi_ps_init_scope(&walk_state->parser_state, op);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (method_node) {
+		walk_state->parser_state.start_node = method_node;
+		walk_state->walk_type = ACPI_WALK_METHOD;
+		walk_state->method_node = method_node;
+		walk_state->method_desc =
+		    acpi_ns_get_attached_object(method_node);
+
+		/* Push start scope on scope stack and make it current  */
+
+		status =
+		    acpi_ds_scope_stack_push(method_node, ACPI_TYPE_METHOD,
+					     walk_state);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+
+		/* Init the method arguments */
+
+		status = acpi_ds_method_data_init_args(walk_state->params,
+						       ACPI_METHOD_NUM_ARGS,
+						       walk_state);
+		if (ACPI_FAILURE(status)) {
+			return_ACPI_STATUS(status);
+		}
+	} else {
+		/*
+		 * Setup the current scope.
+		 * Find a Named Op that has a namespace node associated with it.
+		 * search upwards from this Op. Current scope is the first
+		 * Op with a namespace node.
+		 */
+		extra_op = parser_state->start_op;
+		while (extra_op && !extra_op->common.node) {
+			extra_op = extra_op->common.parent;
+		}
+
+		if (!extra_op) {
+			parser_state->start_node = NULL;
+		} else {
+			parser_state->start_node = extra_op->common.node;
+		}
+
+		if (parser_state->start_node) {
+
+			/* Push start scope on scope stack and make it current  */
+
+			status =
+			    acpi_ds_scope_stack_push(parser_state->start_node,
+						     parser_state->start_node->
+						     type, walk_state);
+			if (ACPI_FAILURE(status)) {
+				return_ACPI_STATUS(status);
+			}
+		}
+	}
+
+	status = acpi_ds_init_callbacks(walk_state, pass_number);
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ds_delete_walk_state
+ *
+ * PARAMETERS:  walk_state      - State to delete
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Delete a walk state including all internal data structures
+ *
+ ******************************************************************************/
+
+void acpi_ds_delete_walk_state(struct acpi_walk_state *walk_state)
+{
+	union acpi_generic_state *state;
+
+	ACPI_FUNCTION_TRACE_PTR(ds_delete_walk_state, walk_state);
+
+	if (!walk_state) {
+		return_VOID;
+	}
+
+	if (walk_state->descriptor_type != ACPI_DESC_TYPE_WALK) {
+		ACPI_ERROR((AE_INFO, "%p is not a valid walk state",
+			    walk_state));
+		return_VOID;
+	}
+
+	/* There should not be any open scopes */
+
+	if (walk_state->parser_state.scope) {
+		ACPI_ERROR((AE_INFO, "%p walk still has a scope list",
+			    walk_state));
+		acpi_ps_cleanup_scope(&walk_state->parser_state);
+	}
+
+	/* Always must free any linked control states */
+
+	while (walk_state->control_state) {
+		state = walk_state->control_state;
+		walk_state->control_state = state->common.next;
+
+		acpi_ut_delete_generic_state(state);
+	}
+
+	/* Always must free any linked parse states */
+
+	while (walk_state->scope_info) {
+		state = walk_state->scope_info;
+		walk_state->scope_info = state->common.next;
+
+		acpi_ut_delete_generic_state(state);
+	}
+
+	/* Always must free any stacked result states */
+
+	while (walk_state->results) {
+		state = walk_state->results;
+		walk_state->results = state->common.next;
+
+		acpi_ut_delete_generic_state(state);
+	}
+
+	ACPI_FREE(walk_state);
+	return_VOID;
+}