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linux-sg2042/drivers/acpi/pci_irq.c

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// 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, 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_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;
}
}
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