diff options
Diffstat (limited to 'drivers/acpi/pci_irq.c')
| -rw-r--r-- | drivers/acpi/pci_irq.c | 168 |
1 files changed, 98 insertions, 70 deletions
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c index 41c5e1b799ef..ad81aa03fe2f 100644 --- a/drivers/acpi/pci_irq.c +++ b/drivers/acpi/pci_irq.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) * @@ -6,26 +7,9 @@ * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de> * (c) Copyright 2008 Hewlett-Packard Development Company, L.P. * Bjorn Helgaas <bjorn.helgaas@hp.com> - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or (at - * your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ +#define pr_fmt(fmt) "ACPI: PCI: " fmt #include <linux/dmi.h> #include <linux/kernel.h> @@ -37,16 +21,10 @@ #include <linux/pci.h> #include <linux/acpi.h> #include <linux/slab.h> -#include <acpi/acpi_bus.h> -#include <acpi/acpi_drivers.h> - -#define PREFIX "ACPI: " - -#define _COMPONENT ACPI_PCI_COMPONENT -ACPI_MODULE_NAME("pci_irq"); +#include <linux/interrupt.h> +#include <linux/string_choices.h> struct acpi_prt_entry { - struct list_head list; struct acpi_pci_id id; u8 pin; acpi_handle link; @@ -138,9 +116,6 @@ static void do_prt_fixups(struct acpi_prt_entry *entry, quirk = &prt_quirks[i]; /* All current quirks involve link devices, not GSIs */ - if (!prt->source) - continue; - if (dmi_check_system(quirk->system) && entry->id.segment == quirk->segment && entry->id.bus == quirk->bus && @@ -148,7 +123,7 @@ static void do_prt_fixups(struct acpi_prt_entry *entry, entry->pin == quirk->pin && !strcmp(prt->source, quirk->source) && strlen(prt->source) >= strlen(quirk->actual_source)) { - printk(KERN_WARNING PREFIX "firmware reports " + pr_warn("Firmware reports " "%04x:%02x:%02x PCI INT %c connected to %s; " "changing to %s\n", entry->id.segment, entry->id.bus, @@ -165,7 +140,7 @@ static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev, { int segment = pci_domain_nr(dev->bus); int bus = dev->bus->number; - int device = PCI_SLOT(dev->devfn); + int device = pci_ari_enabled(dev->bus) ? 0 : PCI_SLOT(dev->devfn); struct acpi_prt_entry *entry; if (((prt->address >> 16) & 0xffff) != device || @@ -197,7 +172,7 @@ static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev, * 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 @@ -213,12 +188,9 @@ static int acpi_pci_irq_check_entry(acpi_handle handle, struct pci_dev *dev, * the IRQ value, which is hardwired to specific interrupt inputs on * the interrupt controller. */ - - ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, - " %04x:%02x:%02x[%c] -> %s[%d]\n", - entry->id.segment, entry->id.bus, - entry->id.device, pin_name(entry->pin), - prt->source, entry->index)); + 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; @@ -317,7 +289,7 @@ static int acpi_reroute_boot_interrupt(struct pci_dev *dev, } #endif /* CONFIG_X86_IO_APIC */ -static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) +struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) { struct acpi_prt_entry *entry = NULL; struct pci_dev *bridge; @@ -329,8 +301,7 @@ static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) #ifdef CONFIG_X86_IO_APIC acpi_reroute_boot_interrupt(dev, entry); #endif /* CONFIG_X86_IO_APIC */ - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n", - pci_name(dev), pin_name(pin))); + dev_dbg(&dev->dev, "Found [%c] _PRT entry\n", pin_name(pin)); return entry; } @@ -346,9 +317,7 @@ static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) /* PC card has the same IRQ as its cardbridge */ bridge_pin = bridge->pin; if (!bridge_pin) { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "No interrupt pin configured for device %s\n", - pci_name(bridge))); + dev_dbg(&bridge->dev, "No interrupt pin configured\n"); return NULL; } pin = bridge_pin; @@ -356,10 +325,8 @@ static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int pin) ret = acpi_pci_irq_find_prt_entry(bridge, pin, &entry); if (!ret && entry) { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Derived GSI for %s INT %c from %s\n", - pci_name(dev), pin_name(orig_pin), - pci_name(bridge))); + dev_dbg(&dev->dev, "Derived GSI INT %c from %s\n", + pin_name(orig_pin), pci_name(bridge)); return entry; } @@ -372,25 +339,78 @@ static struct acpi_prt_entry *acpi_pci_irq_lookup(struct pci_dev *dev, int 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; - int polarity = ACPI_ACTIVE_LOW; + /* + * 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) { - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "No interrupt pin configured for device %s\n", - pci_name(dev))); + 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) { /* @@ -413,25 +433,21 @@ int acpi_pci_irq_enable(struct pci_dev *dev) } else gsi = -1; - /* - * No IRQ known to the ACPI subsystem - maybe the BIOS / - * driver reported one, then use it. Exit in any case. - */ if (gsi < 0) { - u32 dev_gsi; - /* Interrupt Line values above 0xF are forbidden */ - if (dev->irq > 0 && (dev->irq <= 0xF) && - (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(pin), dev->irq); - acpi_register_gsi(&dev->dev, dev_gsi, - ACPI_LEVEL_SENSITIVE, - ACPI_ACTIVE_LOW); - } else { + /* + * 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; } @@ -443,6 +459,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev) return rc; } dev->irq = rc; + dev->irq_managed = 1; if (link) snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link); @@ -452,7 +469,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev) 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); + str_low_high(polarity == ACPI_ACTIVE_LOW), dev->irq); kfree(entry); return 0; @@ -465,9 +482,17 @@ void acpi_pci_irq_disable(struct pci_dev *dev) u8 pin; pin = dev->pin; - if (!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; @@ -485,5 +510,8 @@ void acpi_pci_irq_disable(struct pci_dev *dev) */ dev_dbg(&dev->dev, "PCI INT %c disabled\n", pin_name(pin)); - acpi_unregister_gsi(gsi); + if (gsi >= 0) { + acpi_unregister_gsi(gsi); + dev->irq_managed = 0; + } } |