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