linux/drivers/acpi/pci_irq.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <[email protected]>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <[email protected]>
 *  Copyright (C) 2002       Dominik Brodowski <[email protected]>
 *  (c) Copyright 2008 Hewlett-Packard Development Company, L.P.
 *	Bjorn Helgaas <[email protected]>
 */

#define pr_fmt(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 { … };

static inline char pin_name(int pin)
{ … }

/* --------------------------------------------------------------------------
                         PCI IRQ Routing Table (PRT) Support
   -------------------------------------------------------------------------- */

/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
static const struct dmi_system_id medion_md9580[] = …;

/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
static const struct dmi_system_id dell_optiplex[] = …;

/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
static const struct dmi_system_id hp_t5710[] = …;

struct prt_quirk { … };

#define PCI_INTX_PIN(c) …

/*
 * 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[] = …;

static void do_prt_fixups(struct acpi_prt_entry *entry,
			  struct acpi_pci_routing_table *prt)
{ … }

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)
{ … }

static int acpi_pci_irq_find_prt_entry(struct pci_dev *dev,
			  int pin, struct acpi_prt_entry **entry_ptr)
{ … }

/* --------------------------------------------------------------------------
                          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)
{ … }

/*
 * 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)
{ … }
#endif /* CONFIG_X86_IO_APIC */

struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
{ … }

#if IS_ENABLED(CONFIG_ISA) || IS_ENABLED(CONFIG_EISA)
static int acpi_isa_register_gsi(struct pci_dev *dev)
{ … }
#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)
{ … }

int acpi_pci_irq_enable(struct pci_dev *dev)
{ … }

void acpi_pci_irq_disable(struct pci_dev *dev)
{ … }