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, 516 insertions, 0 deletions

diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
new file mode 100644
index 000000000..ff30ceca2
--- /dev/null
+++ b/drivers/acpi/pci_irq.c
@@ -0,0 +1,516 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2002       Dominik Brodowski <devel@brodo.de>
+ *  (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
+ *	Bjorn Helgaas <bjorn.helgaas@hp.com>
+ */
+
+#define pr_fmt(fmt) "ACPI: PCI: " fmt
+
+#include <linux/dmi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/pm.h>
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+
+struct acpi_prt_entry {
+	struct acpi_pci_id	id;
+	u8			pin;
+	acpi_handle		link;
+	u32			index;		/* GSI, or link _CRS index */
+};
+
+static inline char pin_name(int pin)
+{
+	return 'A' + pin - 1;
+}
+
+/* --------------------------------------------------------------------------
+                         PCI IRQ Routing Table (PRT) Support
+   -------------------------------------------------------------------------- */
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
+static const struct dmi_system_id medion_md9580[] = {
+	{
+		.ident = "Medion MD9580-F laptop",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
+		},
+	},
+	{ }
+};
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
+static const struct dmi_system_id dell_optiplex[] = {
+	{
+		.ident = "Dell Optiplex GX1",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
+		},
+	},
+	{ }
+};
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
+static const struct dmi_system_id hp_t5710[] = {
+	{
+		.ident = "HP t5710",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
+			DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
+		},
+	},
+	{ }
+};
+
+struct prt_quirk {
+	const struct dmi_system_id *system;
+	unsigned int		segment;
+	unsigned int		bus;
+	unsigned int		device;
+	unsigned char		pin;
+	const char		*source;	/* according to BIOS */
+	const char		*actual_source;
+};
+
+#define PCI_INTX_PIN(c)		(c - 'A' + 1)
+
+/*
+ * These systems have incorrect _PRT entries.  The BIOS claims the PCI
+ * interrupt at the listed segment/bus/device/pin is connected to the first
+ * link device, but it is actually connected to the second.
+ */
+static const struct prt_quirk prt_quirks[] = {
+	{ medion_md9580, 0, 0, 9, PCI_INTX_PIN('A'),
+		"\\_SB_.PCI0.ISA_.LNKA",
+		"\\_SB_.PCI0.ISA_.LNKB"},
+	{ dell_optiplex, 0, 0, 0xd, PCI_INTX_PIN('A'),
+		"\\_SB_.LNKB",
+		"\\_SB_.LNKA"},
+	{ hp_t5710, 0, 0, 1, PCI_INTX_PIN('A'),
+		"\\_SB_.PCI0.LNK1",
+		"\\_SB_.PCI0.LNK3"},
+};
+
+static void do_prt_fixups(struct acpi_prt_entry *entry,
+			  struct acpi_pci_routing_table *prt)
+{
+	int i;
+	const struct prt_quirk *quirk;
+
+	for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
+		quirk = &prt_quirks[i];
+
+		/* All current quirks involve link devices, not GSIs */
+		if (dmi_check_system(quirk->system) &&
+		    entry->id.segment == quirk->segment &&
+		    entry->id.bus == quirk->bus &&
+		    entry->id.device == quirk->device &&
+		    entry->pin == quirk->pin &&
+		    !strcmp(prt->source, quirk->source) &&
+		    strlen(prt->source) >= strlen(quirk->actual_source)) {
+			pr_warn("Firmware reports "
+				"%04x:%02x:%02x PCI INT %c connected to %s; "
+				"changing to %s\n",
+				entry->id.segment, entry->id.bus,
+				entry->id.device, pin_name(entry->pin),
+				prt->source, quirk->actual_source);
+			strcpy(prt->source, quirk->actual_source);
+		}
+	}
+}
+
+static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev,
+				  int pin, struct acpi_pci_routing_table *prt,
+				  struct acpi_prt_entry **entry_ptr)
+{
+	int segment = pci_domain_nr(dev->bus);
+	int bus = dev->bus->number;
+	int device = pci_ari_enabled(dev->bus) ? 0 : PCI_SLOT(dev->devfn);
+	struct acpi_prt_entry *entry;
+
+	if (((prt->address >> 16) & 0xffff) != device ||
+	    prt->pin + 1 != pin)
+		return -ENODEV;
+
+	entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
+	if (!entry)
+		return -ENOMEM;
+
+	/*
+	 * Note that the _PRT uses 0=INTA, 1=INTB, etc, while PCI uses
+	 * 1=INTA, 2=INTB.  We use the PCI encoding throughout, so convert
+	 * it here.
+	 */
+	entry->id.segment = segment;
+	entry->id.bus = bus;
+	entry->id.device = (prt->address >> 16) & 0xFFFF;
+	entry->pin = prt->pin + 1;
+
+	do_prt_fixups(entry, prt);
+
+	entry->index = prt->source_index;
+
+	/*
+	 * Type 1: Dynamic
+	 * ---------------
+	 * The 'source' field specifies the PCI interrupt link device used to
+	 * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
+	 * indicates which resource descriptor in the resource template (of
+	 * the link device) this interrupt is allocated from.
+	 *
+	 * NOTE: Don't query the Link Device for IRQ information at this time
+	 *       because Link Device enumeration may not have occurred yet
+	 *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
+	 *       namespace).
+	 */
+	if (prt->source[0])
+		acpi_get_handle(handle, prt->source, &entry->link);
+
+	/*
+	 * Type 2: Static
+	 * --------------
+	 * The 'source' field is NULL, and the 'source_index' field specifies
+	 * the IRQ value, which is hardwired to specific interrupt inputs on
+	 * the interrupt controller.
+	 */
+	pr_debug("%04x:%02x:%02x[%c] -> %s[%d]\n",
+		 entry->id.segment, entry->id.bus, entry->id.device,
+		 pin_name(entry->pin), prt->source, entry->index);
+
+	*entry_ptr = entry;
+
+	return 0;
+}
+
+static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
+			  int pin, struct acpi_prt_entry **entry_ptr)
+{
+	acpi_status status;
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_pci_routing_table *entry;
+	acpi_handle handle = NULL;
+
+	if (dev->bus->bridge)
+		handle = ACPI_HANDLE(dev->bus->bridge);
+
+	if (!handle)
+		return -ENODEV;
+
+	/* 'handle' is the _PRT's parent (root bridge or PCI-PCI bridge) */
+	status = acpi_get_irq_routing_table(handle, &buffer);
+	if (ACPI_FAILURE(status)) {
+		kfree(buffer.pointer);
+		return -ENODEV;
+	}
+
+	entry = buffer.pointer;
+	while (entry && (entry->length > 0)) {
+		if (!acpi_pci_irq_check_entry(handle, dev, pin,
+						 entry, entry_ptr))
+			break;
+		entry = (struct acpi_pci_routing_table *)
+		    ((unsigned long)entry + entry->length);
+	}
+
+	kfree(buffer.pointer);
+	return 0;
+}
+
+/* --------------------------------------------------------------------------
+                          PCI Interrupt Routing Support
+   -------------------------------------------------------------------------- */
+#ifdef CONFIG_X86_IO_APIC
+extern int noioapicquirk;
+extern int noioapicreroute;
+
+static int bridge_has_boot_interrupt_variant(struct pci_bus *bus)
+{
+	struct pci_bus *bus_it;
+
+	for (bus_it = bus ; bus_it ; bus_it = bus_it->parent) {
+		if (!bus_it->self)
+			return 0;
+		if (bus_it->self->irq_reroute_variant)
+			return bus_it->self->irq_reroute_variant;
+	}
+	return 0;
+}
+
+/*
+ * Some chipsets (e.g. Intel 6700PXH) generate a legacy INTx when the IRQ
+ * entry in the chipset's IO-APIC is masked (as, e.g. the RT kernel does
+ * during interrupt handling). When this INTx generation cannot be disabled,
+ * we reroute these interrupts to their legacy equivalent to get rid of
+ * spurious interrupts.
+ */
+static int acpi_reroute_boot_interrupt(struct pci_dev *dev,
+				       struct acpi_prt_entry *entry)
+{
+	if (noioapicquirk || noioapicreroute) {
+		return 0;
+	} else {
+		switch (bridge_has_boot_interrupt_variant(dev->bus)) {
+		case 0:
+			/* no rerouting necessary */
+			return 0;
+		case INTEL_IRQ_REROUTE_VARIANT:
+			/*
+			 * Remap according to INTx routing table in 6700PXH
+			 * specs, intel order number 302628-002, section
+			 * 2.15.2. Other chipsets (80332, ...) have the same
+			 * mapping and are handled here as well.
+			 */
+			dev_info(&dev->dev, "PCI IRQ %d -> rerouted to legacy "
+				 "IRQ %d\n", entry->index,
+				 (entry->index % 4) + 16);
+			entry->index = (entry->index % 4) + 16;
+			return 1;
+		default:
+			dev_warn(&dev->dev, "Cannot reroute IRQ %d to legacy "
+				 "IRQ: unknown mapping\n", entry->index);
+			return -1;
+		}
+	}
+}
+#endif /* CONFIG_X86_IO_APIC */
+
+static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
+{
+	struct acpi_prt_entry *entry = NULL;
+	struct pci_dev *bridge;
+	u8 bridge_pin, orig_pin = pin;
+	int ret;
+
+	ret = acpi_pci_irq_find_prt_entry(dev, pin, &entry);
+	if (!ret && entry) {
+#ifdef CONFIG_X86_IO_APIC
+		acpi_reroute_boot_interrupt(dev, entry);
+#endif /* CONFIG_X86_IO_APIC */
+		dev_dbg(&dev->dev, "Found [%c] _PRT entry\n", pin_name(pin));
+		return entry;
+	}
+
+	/*
+	 * Attempt to derive an IRQ for this device from a parent bridge's
+	 * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
+	 */
+	bridge = dev->bus->self;
+	while (bridge) {
+		pin = pci_swizzle_interrupt_pin(dev, pin);
+
+		if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
+			/* PC card has the same IRQ as its cardbridge */
+			bridge_pin = bridge->pin;
+			if (!bridge_pin) {
+				dev_dbg(&bridge->dev, "No interrupt pin configured\n");
+				return NULL;
+			}
+			pin = bridge_pin;
+		}
+
+		ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry);
+		if (!ret && entry) {
+			dev_dbg(&dev->dev, "Derived GSI INT %c from %s\n",
+				pin_name(orig_pin), pci_name(bridge));
+			return entry;
+		}
+
+		dev = bridge;
+		bridge = dev->bus->self;
+	}
+
+	dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
+		 pin_name(orig_pin));
+	return NULL;
+}
+
+#if IS_ENABLED(CONFIG_ISA) || IS_ENABLED(CONFIG_EISA)
+static int acpi_isa_register_gsi(struct pci_dev *dev)
+{
+	u32 dev_gsi;
+
+	/* Interrupt Line values above 0xF are forbidden */
+	if (dev->irq > 0 && (dev->irq <= 0xF) &&
+	    acpi_isa_irq_available(dev->irq) &&
+	    (acpi_isa_irq_to_gsi(dev->irq, &dev_gsi) == 0)) {
+		dev_warn(&dev->dev, "PCI INT %c: no GSI - using ISA IRQ %d\n",
+			 pin_name(dev->pin), dev->irq);
+		acpi_register_gsi(&dev->dev, dev_gsi,
+				  ACPI_LEVEL_SENSITIVE,
+				  ACPI_ACTIVE_LOW);
+		return 0;
+	}
+	return -EINVAL;
+}
+#else
+static inline int acpi_isa_register_gsi(struct pci_dev *dev)
+{
+	return -ENODEV;
+}
+#endif
+
+static inline bool acpi_pci_irq_valid(struct pci_dev *dev, u8 pin)
+{
+#ifdef CONFIG_X86
+	/*
+	 * On x86 irq line 0xff means "unknown" or "no connection"
+	 * (PCI 3.0, Section 6.2.4, footnote on page 223).
+	 */
+	if (dev->irq == 0xff) {
+		dev->irq = IRQ_NOTCONNECTED;
+		dev_warn(&dev->dev, "PCI INT %c: not connected\n",
+			 pin_name(pin));
+		return false;
+	}
+#endif
+	return true;
+}
+
+int acpi_pci_irq_enable(struct pci_dev *dev)
+{
+	struct acpi_prt_entry *entry;
+	int gsi;
+	u8 pin;
+	int triggering = ACPI_LEVEL_SENSITIVE;
+	/*
+	 * On ARM systems with the GIC interrupt model, or LoongArch
+	 * systems with the LPIC interrupt model, level interrupts
+	 * are always polarity high by specification; PCI legacy
+	 * IRQs lines are inverted before reaching the interrupt
+	 * controller and must therefore be considered active high
+	 * as default.
+	 */
+	int polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ||
+		       acpi_irq_model == ACPI_IRQ_MODEL_LPIC ?
+				      ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW;
+	char *link = NULL;
+	char link_desc[16];
+	int rc;
+
+	pin = dev->pin;
+	if (!pin) {
+		dev_dbg(&dev->dev, "No interrupt pin configured\n");
+		return 0;
+	}
+
+	if (dev->irq_managed && dev->irq > 0)
+		return 0;
+
+	entry = acpi_pci_irq_lookup(dev, pin);
+	if (!entry) {
+		/*
+		 * IDE legacy mode controller IRQs are magic. Why do compat
+		 * extensions always make such a nasty mess.
+		 */
+		if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
+				(dev->class & 0x05) == 0)
+			return 0;
+	}
+
+	if (entry) {
+		if (entry->link)
+			gsi = acpi_pci_link_allocate_irq(entry->link,
+							 entry->index,
+							 &triggering, &polarity,
+							 &link);
+		else
+			gsi = entry->index;
+	} else
+		gsi = -1;
+
+	if (gsi < 0) {
+		/*
+		 * No IRQ known to the ACPI subsystem - maybe the BIOS /
+		 * driver reported one, then use it. Exit in any case.
+		 */
+		if (!acpi_pci_irq_valid(dev, pin)) {
+			kfree(entry);
+			return 0;
+		}
+
+		if (acpi_isa_register_gsi(dev))
+			dev_warn(&dev->dev, "PCI INT %c: no GSI\n",
+				 pin_name(pin));
+
+		kfree(entry);
+		return 0;
+	}
+
+	rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
+	if (rc < 0) {
+		dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
+			 pin_name(pin));
+		kfree(entry);
+		return rc;
+	}
+	dev->irq = rc;
+	dev->irq_managed = 1;
+
+	if (link)
+		snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
+	else
+		link_desc[0] = '\0';
+
+	dev_dbg(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
+		pin_name(pin), link_desc, gsi,
+		(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
+		(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
+
+	kfree(entry);
+	return 0;
+}
+
+void acpi_pci_irq_disable(struct pci_dev *dev)
+{
+	struct acpi_prt_entry *entry;
+	int gsi;
+	u8 pin;
+
+	pin = dev->pin;
+	if (!pin || !dev->irq_managed || dev->irq <= 0)
+		return;
+
+	/* Keep IOAPIC pin configuration when suspending */
+	if (dev->dev.power.is_prepared)
+		return;
+#ifdef	CONFIG_PM
+	if (dev->dev.power.runtime_status == RPM_SUSPENDING)
+		return;
+#endif
+
+	entry = acpi_pci_irq_lookup(dev, pin);
+	if (!entry)
+		return;
+
+	if (entry->link)
+		gsi = acpi_pci_link_free_irq(entry->link);
+	else
+		gsi = entry->index;
+
+	kfree(entry);
+
+	/*
+	 * TBD: It might be worth clearing dev->irq by magic constant
+	 * (e.g. PCI_UNDEFINED_IRQ).
+	 */
+
+	dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin));
+	if (gsi >= 0) {
+		acpi_unregister_gsi(gsi);
+		dev->irq_managed = 0;
+	}
+}