764 lines
20 KiB
C
764 lines
20 KiB
C
/*-
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* Copyright (c) 2002 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include "acpi.h"
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#include <dev/acpica/acpivar.h>
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#include <dev/acpica/acpi_pcibvar.h>
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#include <machine/pci_cfgreg.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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#include "pcib_if.h"
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/* Hooks for the ACPI CA debugging infrastructure. */
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#define _COMPONENT ACPI_BUS
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ACPI_MODULE_NAME("PCI_LINK")
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ACPI_SERIAL_DECL(pci_link, "ACPI PCI link");
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#define NUM_ISA_INTERRUPTS 16
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#define NUM_ACPI_INTERRUPTS 256
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/*
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* An ACPI PCI link device may contain multiple links. Each link has its
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* own ACPI resource. _PRT entries specify which link is being used via
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* the Source Index.
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*/
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struct link;
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struct acpi_pci_link_softc {
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int pl_num_links;
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struct link *pl_links;
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};
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struct link {
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struct acpi_pci_link_softc *l_sc;
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uint8_t l_bios_irq;
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uint8_t l_irq;
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uint8_t l_initial_irq;
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int l_res_index;
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int l_num_irqs;
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int *l_irqs;
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int l_references;
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int l_routed:1;
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int l_isa_irq:1;
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ACPI_RESOURCE l_prs_template;
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};
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struct link_res_request {
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struct acpi_pci_link_softc *sc;
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int count;
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};
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MALLOC_DEFINE(M_PCI_LINK, "PCI Link", "ACPI PCI Link structures");
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static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS];
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static int pci_link_bios_isa_irqs;
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static char *pci_link_ids[] = { "PNP0C0F", NULL };
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/*
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* Fetch the short name associated with an ACPI handle and save it in the
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* passed in buffer.
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*/
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static ACPI_STATUS
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acpi_short_name(ACPI_HANDLE handle, char *buffer, size_t buflen)
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{
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ACPI_BUFFER buf;
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buf.Length = buflen;
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buf.Pointer = buffer;
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return (AcpiGetName(handle, ACPI_SINGLE_NAME, &buf));
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}
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static int
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acpi_pci_link_probe(device_t dev)
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{
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char descr[64], name[10];
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/*
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* We explicitly do not check _STA since not all systems set it to
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* sensible values.
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*/
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if (!acpi_disabled("pci_link") &&
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ACPI_ID_PROBE(device_get_parent(dev), dev, pci_link_ids) != NULL) {
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if (ACPI_FAILURE(acpi_short_name(acpi_get_handle(dev), name,
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sizeof(name))))
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device_set_desc(dev, "ACPI PCI Link");
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else {
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snprintf(descr, sizeof(descr), "ACPI PCI Link %s",
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name);
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device_set_desc_copy(dev, descr);
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}
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return (0);
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}
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return (ENXIO);
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}
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static ACPI_STATUS
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acpi_count_resources(ACPI_RESOURCE *res, void *context)
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{
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int *count;
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count = (int *)context;
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(*count)++;
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return (AE_OK);
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}
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static ACPI_STATUS
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link_add_crs(ACPI_RESOURCE *res, void *context)
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{
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struct link_res_request *req;
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struct link *link;
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ACPI_SERIAL_ASSERT(pci_link);
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req = (struct link_res_request *)context;
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link = &req->sc->pl_links[req->count];
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req->count++;
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switch (res->Id) {
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case ACPI_RSTYPE_IRQ:
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case ACPI_RSTYPE_EXT_IRQ:
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if (res->Id == ACPI_RSTYPE_IRQ) {
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if (res->Data.Irq.NumberOfInterrupts > 0) {
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KASSERT(res->Data.Irq.NumberOfInterrupts == 1,
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("%s: too many interrupts", __func__));
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link->l_irq = res->Data.Irq.Interrupts[0];
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}
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} else if (res->Data.ExtendedIrq.NumberOfInterrupts > 0) {
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KASSERT(res->Data.ExtendedIrq.NumberOfInterrupts == 1,
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("%s: too many interrupts", __func__));
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link->l_irq = res->Data.ExtendedIrq.Interrupts[0];
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}
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/*
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* An IRQ of zero means that the link isn't routed.
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*/
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if (link->l_irq == 0)
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link->l_irq = PCI_INVALID_IRQ;
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break;
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}
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return (AE_OK);
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}
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/*
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* Populate the set of possible IRQs for each device.
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*/
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static ACPI_STATUS
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link_add_prs(ACPI_RESOURCE *res, void *context)
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{
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struct link_res_request *req;
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struct link *link;
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UINT32 *irqs;
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int i;
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ACPI_SERIAL_ASSERT(pci_link);
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req = (struct link_res_request *)context;
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link = &req->sc->pl_links[req->count];
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req->count++;
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switch (res->Id) {
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case ACPI_RSTYPE_IRQ:
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case ACPI_RSTYPE_EXT_IRQ:
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/*
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* Stash a copy of the resource for later use when doing
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* _SRS.
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*/
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bcopy(res, &link->l_prs_template, sizeof(ACPI_RESOURCE));
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if (res->Id == ACPI_RSTYPE_IRQ) {
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link->l_num_irqs = res->Data.Irq.NumberOfInterrupts;
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irqs = res->Data.Irq.Interrupts;
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} else {
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link->l_num_irqs =
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res->Data.ExtendedIrq.NumberOfInterrupts;
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irqs = res->Data.ExtendedIrq.Interrupts;
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}
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if (link->l_num_irqs == 0)
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break;
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/*
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* Save a list of the valid IRQs. Also, if all of the
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* valid IRQs are ISA IRQs, then mark this link as
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* routed via an ISA interrupt.
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*/
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link->l_isa_irq = 1;
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link->l_irqs = malloc(sizeof(int) * link->l_num_irqs,
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M_PCI_LINK, M_WAITOK | M_ZERO);
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for (i = 0; i < link->l_num_irqs; i++) {
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link->l_irqs[i] = irqs[i];
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if (irqs[1] >= NUM_ISA_INTERRUPTS)
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link->l_isa_irq = 0;
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}
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break;
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}
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return (AE_OK);
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}
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static int
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link_valid_irq(struct link *link, int irq)
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{
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int i;
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ACPI_SERIAL_ASSERT(pci_link);
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/* Invalid interrupts are never valid. */
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if (!PCI_INTERRUPT_VALID(irq))
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return (0);
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/* Any interrupt in the list of possible interrupts is valid. */
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for (i = 0; i < link->l_num_irqs; i++)
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if (link->l_irqs[i] == irq)
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return (1);
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/*
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* For links routed via an ISA interrupt, if the SCI is routed via
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* an ISA interrupt, the SCI is always treated as a valid IRQ.
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*/
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if (link->l_isa_irq && AcpiGbl_FADT->SciInt == irq &&
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irq < NUM_ISA_INTERRUPTS)
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return (1);
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/* If the interrupt wasn't found in the list it is not valid. */
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return (0);
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}
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static void
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acpi_pci_link_dump(struct acpi_pci_link_softc *sc)
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{
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struct link *link;
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int i, j;
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ACPI_SERIAL_ASSERT(pci_link);
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printf("Index IRQ Rtd Ref IRQs\n");
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for (i = 0; i < sc->pl_num_links; i++) {
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link = &sc->pl_links[i];
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printf("%5d %3d %c %3d ", i, link->l_irq,
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link->l_routed ? 'Y' : 'N', link->l_references);
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if (link->l_num_irqs == 0)
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printf(" none");
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else for (j = 0; j < link->l_num_irqs; j++)
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printf(" %d", link->l_irqs[j]);
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printf("\n");
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}
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}
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static int
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acpi_pci_link_attach(device_t dev)
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{
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struct acpi_pci_link_softc *sc;
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struct link_res_request req;
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ACPI_STATUS status;
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int i;
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sc = device_get_softc(dev);
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ACPI_SERIAL_BEGIN(pci_link);
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/*
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* Count the number of current resources so we know how big of
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* a link array to allocate.
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*/
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status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
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acpi_count_resources, &sc->pl_num_links);
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if (ACPI_FAILURE(status))
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return (ENXIO);
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if (sc->pl_num_links == 0)
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return (0);
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sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links,
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M_PCI_LINK, M_WAITOK | M_ZERO);
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/* Initialize the child links. */
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for (i = 0; i < sc->pl_num_links; i++) {
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sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
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sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ;
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sc->pl_links[i].l_res_index = i;
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sc->pl_links[i].l_sc = sc;
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sc->pl_links[i].l_isa_irq = 0;
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}
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req.count = 0;
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req.sc = sc;
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status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
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link_add_crs, &req);
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if (ACPI_FAILURE(status))
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goto fail;
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req.count = 0;
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status = AcpiWalkResources(acpi_get_handle(dev), "_PRS",
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link_add_prs, &req);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
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goto fail;
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if (bootverbose) {
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device_printf(dev, "Links after initial probe:\n");
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acpi_pci_link_dump(sc);
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}
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/* Verify initial IRQs if we have _PRS. */
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if (status != AE_NOT_FOUND)
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for (i = 0; i < sc->pl_num_links; i++)
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if (!link_valid_irq(&sc->pl_links[i],
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sc->pl_links[i].l_irq))
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sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
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if (bootverbose) {
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device_printf(dev, "Links after initial validation:\n");
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acpi_pci_link_dump(sc);
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}
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/* Save initial IRQs. */
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for (i = 0; i < sc->pl_num_links; i++)
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sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq;
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/*
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* Try to disable this link. If successful, set the current IRQ to
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* zero and flags to indicate this link is not routed. If we can't
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* run _DIS (i.e., the method doesn't exist), assume the initial
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* IRQ was routed by the BIOS.
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*/
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if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL,
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NULL)))
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for (i = 0; i < sc->pl_num_links; i++)
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sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
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else
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for (i = 0; i < sc->pl_num_links; i++)
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if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq))
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sc->pl_links[i].l_routed = 1;
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if (bootverbose) {
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device_printf(dev, "Links after disable:\n");
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acpi_pci_link_dump(sc);
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}
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ACPI_SERIAL_END(pci_link);
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return (0);
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fail:
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ACPI_SERIAL_END(pci_link);
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for (i = 0; i < sc->pl_num_links; i++)
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if (sc->pl_links[i].l_irqs != NULL)
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free(sc->pl_links[i].l_irqs, M_PCI_LINK);
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free(sc->pl_links, M_PCI_LINK);
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return (ENXIO);
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}
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/* XXX: Note that this is identical to pci_pir_search_irq(). */
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static uint8_t
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acpi_pci_link_search_irq(int bus, int device, int pin)
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{
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uint32_t value;
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uint8_t func, maxfunc;
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/* See if we have a valid device at function 0. */
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value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
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if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
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return (PCI_INVALID_IRQ);
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if (value & PCIM_MFDEV)
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maxfunc = PCI_FUNCMAX;
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else
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maxfunc = 0;
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/* Scan all possible functions at this device. */
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for (func = 0; func <= maxfunc; func++) {
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value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
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if (value == 0xffffffff)
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continue;
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value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
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/*
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* See if it uses the pin in question. Note that the passed
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* in pin uses 0 for A, .. 3 for D whereas the intpin
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* register uses 0 for no interrupt, 1 for A, .. 4 for D.
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*/
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if (value != pin + 1)
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continue;
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value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
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if (bootverbose)
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printf(
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"ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n",
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bus, device, pin + 'A', func, value);
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if (value != PCI_INVALID_IRQ)
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return (value);
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}
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return (PCI_INVALID_IRQ);
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}
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|
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void
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acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
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int pin)
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{
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struct acpi_pci_link_softc *sc;
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struct link *link;
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uint8_t bios_irq;
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/* Bump the reference count. */
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ACPI_SERIAL_BEGIN(pci_link);
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sc = device_get_softc(dev);
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KASSERT(index >= 0 && index < sc->pl_num_links,
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("%s: invalid index %d", __func__, index));
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link = &sc->pl_links[index];
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link->l_references++;
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if (link->l_routed)
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pci_link_interrupt_weights[link->l_irq]++;
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|
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/* Try to find a BIOS IRQ setting from any matching devices. */
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bios_irq = acpi_pci_link_search_irq(pcib_get_bus(pcib), slot, pin);
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if (!PCI_INTERRUPT_VALID(bios_irq)) {
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ACPI_SERIAL_END(pci_link);
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return;
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}
|
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|
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/* Validate the BIOS IRQ. */
|
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if (!link_valid_irq(link, bios_irq)) {
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device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n",
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bios_irq, pcib_get_bus(pcib), slot, pin + 'A');
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} else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) {
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link->l_bios_irq = bios_irq;
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if (bios_irq < NUM_ISA_INTERRUPTS)
|
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pci_link_bios_isa_irqs |= (1 << bios_irq);
|
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if (bios_irq != link->l_initial_irq &&
|
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PCI_INTERRUPT_VALID(link->l_initial_irq))
|
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device_printf(dev,
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"BIOS IRQ %u does not match initial IRQ %u\n",
|
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bios_irq, link->l_initial_irq);
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} else if (bios_irq != link->l_bios_irq)
|
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device_printf(dev,
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"BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n",
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bios_irq, pcib_get_bus(pcib), slot, pin + 'A',
|
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link->l_bios_irq);
|
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ACPI_SERIAL_END(pci_link);
|
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}
|
|
|
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static ACPI_STATUS
|
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acpi_pci_link_route_irqs(device_t dev)
|
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{
|
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struct acpi_pci_link_softc *sc;
|
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ACPI_RESOURCE *resource, *end, newres, *resptr;
|
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ACPI_BUFFER crsbuf, srsbuf;
|
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ACPI_STATUS status;
|
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struct link *link;
|
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int i;
|
|
|
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/* Fetch the _CRS. */
|
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ACPI_SERIAL_ASSERT(pci_link);
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sc = device_get_softc(dev);
|
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crsbuf.Pointer = NULL;
|
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crsbuf.Length = ACPI_ALLOCATE_BUFFER;
|
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status = AcpiGetCurrentResources(acpi_get_handle(dev), &crsbuf);
|
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if (ACPI_SUCCESS(status) && crsbuf.Pointer == NULL)
|
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status = AE_NO_MEMORY;
|
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if (ACPI_FAILURE(status)) {
|
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if (bootverbose)
|
|
device_printf(dev,
|
|
"Unable to fetch current resources: %s\n",
|
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AcpiFormatException(status));
|
|
return (status);
|
|
}
|
|
|
|
/* Fill in IRQ resources via link structures. */
|
|
srsbuf.Pointer = NULL;
|
|
link = sc->pl_links;
|
|
i = 0;
|
|
resource = (ACPI_RESOURCE *)crsbuf.Pointer;
|
|
end = (ACPI_RESOURCE *)((char *)crsbuf.Pointer + crsbuf.Length);
|
|
for (;;) {
|
|
switch (resource->Id) {
|
|
case ACPI_RSTYPE_IRQ:
|
|
MPASS(i < sc->pl_num_links);
|
|
MPASS(link->l_prs_template.Id == ACPI_RSTYPE_IRQ);
|
|
newres = link->l_prs_template;
|
|
resptr = &newres;
|
|
resptr->Data.Irq.NumberOfInterrupts = 1;
|
|
if (PCI_INTERRUPT_VALID(link->l_irq))
|
|
resptr->Data.Irq.Interrupts[0] = link->l_irq;
|
|
else
|
|
resptr->Data.Irq.Interrupts[0] = 0;
|
|
break;
|
|
case ACPI_RSTYPE_EXT_IRQ:
|
|
MPASS(i < sc->pl_num_links);
|
|
MPASS(link->l_prs_template.Id == ACPI_RSTYPE_EXT_IRQ);
|
|
newres = link->l_prs_template;
|
|
resptr = &newres;
|
|
resptr->Data.ExtendedIrq.NumberOfInterrupts = 1;
|
|
if (PCI_INTERRUPT_VALID(link->l_irq))
|
|
resource->Data.ExtendedIrq.Interrupts[0] =
|
|
link->l_irq;
|
|
else
|
|
resource->Data.ExtendedIrq.Interrupts[0] = 0;
|
|
break;
|
|
default:
|
|
resptr = resource;
|
|
}
|
|
status = acpi_AppendBufferResource(&srsbuf, resptr);
|
|
if (ACPI_FAILURE(status)) {
|
|
device_printf(dev, "Unable to build reousrces: %s\n",
|
|
AcpiFormatException(status));
|
|
if (srsbuf.Pointer != NULL)
|
|
AcpiOsFree(srsbuf.Pointer);
|
|
AcpiOsFree(crsbuf.Pointer);
|
|
return (status);
|
|
}
|
|
if (resource->Id == ACPI_RSTYPE_END_TAG)
|
|
break;
|
|
resource = ACPI_NEXT_RESOURCE(resource);
|
|
link++;
|
|
i++;
|
|
if (resource >= end)
|
|
break;
|
|
}
|
|
|
|
/* Write out new resources via _SRS. */
|
|
status = AcpiSetCurrentResources(acpi_get_handle(dev), &srsbuf);
|
|
if (ACPI_FAILURE(status)) {
|
|
device_printf(dev, "Unable to route IRQs: %s\n",
|
|
AcpiFormatException(status));
|
|
AcpiOsFree(crsbuf.Pointer);
|
|
AcpiOsFree(srsbuf.Pointer);
|
|
return (status);
|
|
}
|
|
AcpiOsFree(crsbuf.Pointer);
|
|
|
|
/*
|
|
* Perform acpi_config_intr() on each IRQ resource if it was just
|
|
* routed for the first time.
|
|
*/
|
|
link = sc->pl_links;
|
|
i = 0;
|
|
resource = (ACPI_RESOURCE *)srsbuf.Pointer;
|
|
for (;;) {
|
|
if (resource->Id == ACPI_RSTYPE_END_TAG)
|
|
break;
|
|
MPASS(i < sc->pl_num_links);
|
|
if (link->l_routed || !PCI_INTERRUPT_VALID(link->l_irq))
|
|
continue;
|
|
switch (resource->Id) {
|
|
case ACPI_RSTYPE_IRQ:
|
|
case ACPI_RSTYPE_EXT_IRQ:
|
|
link->l_routed = 1;
|
|
acpi_config_intr(dev, resource);
|
|
pci_link_interrupt_weights[link->l_irq] +=
|
|
link->l_references;
|
|
break;
|
|
}
|
|
resource = ACPI_NEXT_RESOURCE(resource);
|
|
link++;
|
|
i++;
|
|
if (resource >= end)
|
|
break;
|
|
}
|
|
AcpiOsFree(srsbuf.Pointer);
|
|
return (AE_OK);
|
|
}
|
|
|
|
static int
|
|
acpi_pci_link_resume(device_t dev)
|
|
{
|
|
#if 0 /* XXX Disabled temporarily since this hangs resume. */
|
|
ACPI_STATUS status;
|
|
|
|
ACPI_SERIAL_BEGIN(pci_link);
|
|
status = acpi_pci_link_route_irqs(dev);
|
|
ACPI_SERIAL_END(pci_link);
|
|
if (ACPI_FAILURE(status))
|
|
return (ENXIO);
|
|
else
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Pick an IRQ to use for this unrouted link.
|
|
*/
|
|
static uint8_t
|
|
acpi_pci_link_choose_irq(device_t dev, struct link *link)
|
|
{
|
|
char tunable_buffer[64], link_name[5];
|
|
u_int8_t best_irq, pos_irq;
|
|
int best_weight, pos_weight, i;
|
|
|
|
KASSERT(link->l_routed == 0, ("%s: link already routed", __func__));
|
|
KASSERT(!PCI_INTERRUPT_VALID(link->l_irq),
|
|
("%s: link already has an IRQ", __func__));
|
|
|
|
/* Check for a tunable override and use it if it is valid. */
|
|
if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), link_name,
|
|
sizeof(link_name)))) {
|
|
snprintf(tunable_buffer, sizeof(tunable_buffer),
|
|
"hw.pci.link.%s.%d.irq", link_name, link->l_res_index);
|
|
if (getenv_int(tunable_buffer, &i) &&
|
|
PCI_INTERRUPT_VALID(i) && link_valid_irq(link, i))
|
|
return (i);
|
|
snprintf(tunable_buffer, sizeof(tunable_buffer),
|
|
"hw.pci.link.%s.irq", link_name);
|
|
if (getenv_int(tunable_buffer, &i) &&
|
|
PCI_INTERRUPT_VALID(i) && link_valid_irq(link, i))
|
|
return (i);
|
|
}
|
|
|
|
/*
|
|
* If we have a valid BIOS IRQ, use that. We trust what the BIOS
|
|
* says it routed over what _CRS says the link thinks is routed.
|
|
*/
|
|
if (PCI_INTERRUPT_VALID(link->l_bios_irq))
|
|
return (link->l_bios_irq);
|
|
|
|
/*
|
|
* If we don't have a BIOS IRQ but do have a valid IRQ from _CRS,
|
|
* then use that.
|
|
*/
|
|
if (PCI_INTERRUPT_VALID(link->l_initial_irq))
|
|
return (link->l_initial_irq);
|
|
|
|
/*
|
|
* Ok, we have no useful hints, so we have to pick from the
|
|
* possible IRQs. For ISA IRQs we only use interrupts that
|
|
* have already been used by the BIOS.
|
|
*/
|
|
best_irq = PCI_INVALID_IRQ;
|
|
best_weight = INT_MAX;
|
|
for (i = 0; i < link->l_num_irqs; i++) {
|
|
pos_irq = link->l_irqs[i];
|
|
if (pos_irq < NUM_ISA_INTERRUPTS &&
|
|
(pci_link_bios_isa_irqs & 1 << pos_irq) == 0)
|
|
continue;
|
|
pos_weight = pci_link_interrupt_weights[pos_irq];
|
|
if (pos_weight < best_weight) {
|
|
best_weight = pos_weight;
|
|
best_irq = pos_irq;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If this is an ISA IRQ, try using the SCI if it is also an ISA
|
|
* interrupt as a fallback.
|
|
*/
|
|
if (link->l_isa_irq) {
|
|
pos_irq = AcpiGbl_FADT->SciInt;
|
|
pos_weight = pci_link_interrupt_weights[pos_irq];
|
|
if (pos_weight < best_weight) {
|
|
best_weight = pos_weight;
|
|
best_irq = pos_irq;
|
|
}
|
|
}
|
|
|
|
if (bootverbose) {
|
|
if (PCI_INTERRUPT_VALID(best_irq))
|
|
device_printf(dev, "Picked IRQ %u with weight %d\n",
|
|
best_irq, best_weight);
|
|
} else
|
|
device_printf(dev, "Unable to choose an IRQ\n");
|
|
return (best_irq);
|
|
}
|
|
|
|
int
|
|
acpi_pci_link_route_interrupt(device_t dev, int index)
|
|
{
|
|
struct acpi_pci_link_softc *sc;
|
|
struct link *link;
|
|
|
|
ACPI_SERIAL_BEGIN(pci_link);
|
|
sc = device_get_softc(dev);
|
|
KASSERT(index >= 0 && index < sc->pl_num_links,
|
|
("%s: invalid index %d", __func__, index));
|
|
link = &sc->pl_links[index];
|
|
|
|
/*
|
|
* If this link device is already routed to an interrupt, just return
|
|
* the interrupt it is routed to.
|
|
*/
|
|
if (link->l_routed) {
|
|
KASSERT(PCI_INTERRUPT_VALID(link->l_irq),
|
|
("%s: link is routed but has an invalid IRQ", __func__));
|
|
ACPI_SERIAL_END(pci_link);
|
|
return (link->l_irq);
|
|
}
|
|
|
|
/* Choose an IRQ if we need one. */
|
|
if (!PCI_INTERRUPT_VALID(link->l_irq)) {
|
|
link->l_irq = acpi_pci_link_choose_irq(dev, link);
|
|
|
|
/*
|
|
* Try to route the interrupt we picked. If it fails, then
|
|
* assume the interrupt is not routed.
|
|
*/
|
|
if (PCI_INTERRUPT_VALID(link->l_irq)) {
|
|
acpi_pci_link_route_irqs(dev);
|
|
if (!link->l_routed)
|
|
link->l_irq = PCI_INVALID_IRQ;
|
|
}
|
|
}
|
|
ACPI_SERIAL_END(pci_link);
|
|
|
|
return (link->l_irq);
|
|
}
|
|
|
|
/*
|
|
* This is gross, but we abuse the identify routine to perform one-time
|
|
* SYSINIT() style initialization for the driver.
|
|
*/
|
|
static void
|
|
acpi_pci_link_identify(driver_t *driver, device_t parent)
|
|
{
|
|
|
|
/*
|
|
* If the SCI is an ISA IRQ, add it to the bitmask of known good
|
|
* ISA IRQs.
|
|
*
|
|
* XXX: If we are using the APIC, the SCI might have been
|
|
* rerouted to an APIC pin in which case this is invalid. However,
|
|
* if we are using the APIC, we also shouldn't be having any PCI
|
|
* interrupts routed via ISA IRQs, so this is probably ok.
|
|
*/
|
|
if (AcpiGbl_FADT->SciInt < NUM_ISA_INTERRUPTS)
|
|
pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT->SciInt);
|
|
}
|
|
|
|
static device_method_t acpi_pci_link_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_identify, acpi_pci_link_identify),
|
|
DEVMETHOD(device_probe, acpi_pci_link_probe),
|
|
DEVMETHOD(device_attach, acpi_pci_link_attach),
|
|
DEVMETHOD(device_resume, acpi_pci_link_resume),
|
|
|
|
{0, 0}
|
|
};
|
|
|
|
static driver_t acpi_pci_link_driver = {
|
|
"pci_link",
|
|
acpi_pci_link_methods,
|
|
sizeof(struct acpi_pci_link_softc),
|
|
};
|
|
|
|
static devclass_t pci_link_devclass;
|
|
|
|
DRIVER_MODULE(acpi_pci_link, acpi, acpi_pci_link_driver, pci_link_devclass, 0,
|
|
0);
|
|
MODULE_DEPEND(acpi_pci_link, acpi, 1, 1, 1);
|