8f4c2e526b
we are probing a PCI-PCI bridge it is because we found one by enumerating the devices on a PCI bus, so the bridge is definitely present. A few BIOSes report incorrect status (_STA) for some bridges that claimed they were not present when in fact they were. While here, move this check earlier for Host-PCI bridges so attach fails before doing any work that needs to be torn down. PR: kern/91594 Tested by: Jack Vogel @ Intel MFC after: 1 week
281 lines
8.3 KiB
C
281 lines
8.3 KiB
C
/*-
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* Copyright (c) 2000 Michael Smith
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* Copyright (c) 2000 BSDi
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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/malloc.h>
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#include <sys/kernel.h>
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#include <contrib/dev/acpica/include/acpi.h>
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#include <contrib/dev/acpica/include/accommon.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 <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")
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ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
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/*
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* For locking, we assume the caller is not concurrent since this is
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* triggered by newbus methods.
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*/
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struct prt_lookup_request {
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ACPI_PCI_ROUTING_TABLE *pr_entry;
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u_int pr_pin;
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u_int pr_slot;
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};
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typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
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static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
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static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
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static void prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
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void *arg);
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static void
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prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
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{
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ACPI_PCI_ROUTING_TABLE *entry;
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char *prtptr;
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/* First check to see if there is a table to walk. */
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if (prt == NULL || prt->Pointer == NULL)
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return;
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/* Walk the table executing the handler function for each entry. */
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prtptr = prt->Pointer;
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entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
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while (entry->Length != 0) {
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handler(entry, arg);
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prtptr += entry->Length;
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entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
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}
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}
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static void
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prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
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{
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ACPI_HANDLE handle;
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device_t child, pcib;
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int error;
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/* We only care about entries that reference a link device. */
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if (entry->Source == NULL || entry->Source[0] == '\0')
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return;
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/*
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* In practice, we only see SourceIndex's of 0 out in the wild.
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* When indices != 0 have been found, they've been bugs in the ASL.
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*/
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if (entry->SourceIndex != 0)
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return;
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/* Lookup the associated handle and device. */
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pcib = (device_t)arg;
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if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle)))
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return;
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child = acpi_get_device(handle);
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if (child == NULL)
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return;
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/* If the device hasn't been probed yet, force it to do so. */
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error = device_probe_and_attach(child);
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if (error != 0) {
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device_printf(pcib, "failed to force attach of %s\n",
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acpi_name(handle));
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return;
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}
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/* Add a reference for a specific bus/device/pin tuple. */
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acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
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ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
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}
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int
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acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
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{
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ACPI_STATUS status;
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int error;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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/*
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* Get the PCI interrupt routing table for this bus. If we can't
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* get it, this is not an error but may reduce functionality. There
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* are several valid bridges in the field that do not have a _PRT, so
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* only warn about missing tables if bootverbose is set.
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*/
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prt->Length = ACPI_ALLOCATE_BUFFER;
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status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
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if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
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device_printf(dev,
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"could not get PCI interrupt routing table for %s - %s\n",
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acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
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/*
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* Attach the PCI bus proper.
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*/
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if (device_add_child(dev, "pci", busno) == NULL) {
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device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
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return_VALUE(ENXIO);
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}
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/*
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* Now go scan the bus.
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*/
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prt_walk_table(prt, prt_attach_devices, dev);
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error = bus_generic_attach(dev);
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return_VALUE(error);
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}
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static void
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prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
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{
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struct prt_lookup_request *pr;
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pr = (struct prt_lookup_request *)arg;
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if (pr->pr_entry != NULL)
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return;
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/*
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* Compare the slot number (high word of Address) and pin number
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* (note that ACPI uses 0 for INTA) to check for a match.
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*
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* Note that the low word of the Address field (function number)
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* is required by the specification to be 0xffff. We don't risk
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* checking it here.
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*/
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if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
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entry->Pin == pr->pr_pin)
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pr->pr_entry = entry;
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}
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/*
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* Route an interrupt for a child of the bridge.
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*/
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int
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acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
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ACPI_BUFFER *prtbuf)
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{
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ACPI_PCI_ROUTING_TABLE *prt;
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struct prt_lookup_request pr;
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ACPI_HANDLE lnkdev;
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int interrupt;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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interrupt = PCI_INVALID_IRQ;
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/* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
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pin--;
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ACPI_SERIAL_BEGIN(pcib);
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/* Search for a matching entry in the routing table. */
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pr.pr_entry = NULL;
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pr.pr_pin = pin;
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pr.pr_slot = pci_get_slot(dev);
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prt_walk_table(prtbuf, prt_lookup_device, &pr);
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if (pr.pr_entry == NULL) {
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device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
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pci_get_slot(dev), 'A' + pin);
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goto out;
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}
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prt = pr.pr_entry;
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if (bootverbose) {
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device_printf(pcib, "matched entry for %d.%d.INT%c",
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pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
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if (prt->Source != NULL && prt->Source[0] != '\0')
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printf(" (src %s:%u)", prt->Source, prt->SourceIndex);
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printf("\n");
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}
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/*
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* If source is empty/NULL, the source index is a global IRQ number
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* and it's hard-wired so we're done.
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*
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* XXX: If the source index is non-zero, ignore the source device and
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* assume that this is a hard-wired entry.
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*/
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if (prt->Source == NULL || prt->Source[0] == '\0' ||
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prt->SourceIndex != 0) {
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if (bootverbose)
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device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
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pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
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if (prt->SourceIndex) {
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interrupt = prt->SourceIndex;
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BUS_CONFIG_INTR(dev, interrupt, INTR_TRIGGER_LEVEL,
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INTR_POLARITY_LOW);
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} else
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device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
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goto out;
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}
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/*
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* We have to find the source device (PCI interrupt link device).
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*/
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if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
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device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
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prt->Source);
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goto out;
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}
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interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
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prt->SourceIndex);
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if (bootverbose && PCI_INTERRUPT_VALID(interrupt))
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device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
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pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
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out:
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ACPI_SERIAL_END(pcib);
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return_VALUE(interrupt);
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}
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int
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acpi_pcib_power_for_sleep(device_t pcib, device_t dev, int *pstate)
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{
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device_t acpi_dev;
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acpi_dev = devclass_get_device(devclass_find("acpi"), 0);
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acpi_device_pwr_for_sleep(acpi_dev, dev, pstate);
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return (0);
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}
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