freebsd-nq/sys/dev/acpica/acpi_pcib.c
John Baldwin 5e1ba6d4ae Rework the ACPI PCI link code.
- Use a new-bus device driver for the ACPI PCI link devices.  The devices
  are called pci_linkX.  The driver includes suspend/resume support so that
  the ACPI bridge drivers no longer have to poke the links to get them
  to handle suspend/resume.  Also, the code to handle which IRQs a link is
  routed to and choosing an IRQ when a link is not already routed is all
  contained in the link driver.  The PCI bridge drivers now ask the link
  driver which IRQ to use once they determine that a _PRT entry does not
  use a hardwired interrupt number.
- The new link driver includes support for multiple IRQ resources per
  link device as well as preserving any non-IRQ resources when adjusting
  the IRQ that a link is routed to.
- The entire approach to routing when using a link device is now
  link-centric rather than pci bus/device/pin specific.  Thus, when
  using a tunable to override the default IRQ settings, one now uses
  a single tunable to route an entire link rather than routing a single
  device that uses the link (which has great foot-shooting potential if
  the user tries to route the same link to two different IRQs using two
  different pci bus/device/pin hints).  For example, to adjust the IRQ
  that \_SB_.LNKA uses, one would set 'hw.pci.link.LNKA.irq=10' from the
  loader.
- As a side effect of having the link driver, unused link devices will now
  be disabled when they are probed.
- The algorithm for choosing an IRQ for a link that doesn't already have an
  IRQ assigned is now much closer to the one used in $PIR routing.  When a
  link is routed via an ISA IRQ, only known-good IRQs that the BIOS has
  already used are used for routing instead of using probabilities to
  guess at which IRQs are probably not used by an ISA device.  One change
  from $PIR is that the SCI is always considered a viable ISA IRQ, so that
  if the BIOS does not setup any IRQs the kernel will degenerate to routing
  all interrupts over the SCI.  For non ISA IRQs, interrupts are picked
  from the possible pool using a simplistic weighting algorithm.

Tested by:	ru, scottl, others on acpi@
Reviewed by:	njl
2004-11-23 22:26:44 +00:00

269 lines
7.8 KiB
C

/*-
* Copyright (c) 2000 Michael Smith
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include "acpi.h"
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpi_pcibvar.h>
#include <dev/pci/pcivar.h>
#include "pcib_if.h"
/* Hooks for the ACPI CA debugging infrastructure. */
#define _COMPONENT ACPI_BUS
ACPI_MODULE_NAME("PCI")
ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
/*
* For locking, we assume the caller is not concurrent since this is
* triggered by newbus methods.
*/
struct prt_lookup_request {
ACPI_PCI_ROUTING_TABLE *pr_entry;
u_int pr_pin;
u_int pr_slot;
};
typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
static void prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
void *arg);
static void
prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
{
ACPI_PCI_ROUTING_TABLE *entry;
char *prtptr;
/* First check to see if there is a table to walk. */
if (prt == NULL || prt->Pointer == NULL)
return;
/* Walk the table executing the handler function for each entry. */
prtptr = prt->Pointer;
entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
while (entry->Length != 0) {
handler(entry, arg);
prtptr += entry->Length;
entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
}
}
static void
prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
{
ACPI_HANDLE handle;
device_t child, pcib;
int error;
/* We only care about entries that reference a link device. */
if (entry->Source == NULL || entry->Source[0] == '\0')
return;
/* Lookup the associated handle and device. */
pcib = (device_t)arg;
if (ACPI_FAILURE(AcpiGetHandle(acpi_get_handle(pcib), entry->Source,
&handle)))
return;
child = acpi_get_device(handle);
if (child == NULL)
return;
/* If the device hasn't been probed yet, force it to do so. */
error = device_probe_and_attach(child);
if (error != 0) {
device_printf((device_t)arg, "failed to force attach of %s\n",
acpi_name(handle));
return;
}
/* Add a reference for a specific bus/device/pin tuple. */
acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
}
int
acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
{
device_t child;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/*
* Don't attach if we're not really there.
*
* XXX: This isn't entirely correct since we may be a PCI bus
* on a hot-plug docking station, etc.
*/
if (!acpi_DeviceIsPresent(dev))
return_VALUE(ENXIO);
/*
* Get the PCI interrupt routing table for this bus. If we can't
* get it, this is not an error but may reduce functionality. There
* are several valid bridges in the field that do not have a _PRT, so
* only warn about missing tables if bootverbose is set.
*/
prt->Length = ACPI_ALLOCATE_BUFFER;
status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
device_printf(dev,
"could not get PCI interrupt routing table for %s - %s\n",
acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
/*
* Attach the PCI bus proper.
*/
if ((child = device_add_child(dev, "pci", busno)) == NULL) {
device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
return_VALUE(ENXIO);
}
/*
* Now go scan the bus.
*/
prt_walk_table(prt, prt_attach_devices, dev);
return_VALUE (bus_generic_attach(dev));
}
int
acpi_pcib_resume(device_t dev)
{
return (bus_generic_resume(dev));
}
static void
prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
{
struct prt_lookup_request *pr;
pr = (struct prt_lookup_request *)arg;
if (pr->pr_entry != NULL)
return;
/*
* Compare the slot number (high word of Address) and pin number
* (note that ACPI uses 0 for INTA) to check for a match.
*
* Note that the low word of the Address field (function number)
* is required by the specification to be 0xffff. We don't risk
* checking it here.
*/
if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
entry->Pin == pr->pr_pin)
pr->pr_entry = entry;
}
/*
* Route an interrupt for a child of the bridge.
*/
int
acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
ACPI_BUFFER *prtbuf)
{
ACPI_PCI_ROUTING_TABLE *prt;
struct prt_lookup_request pr;
ACPI_HANDLE lnkdev;
int interrupt;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
interrupt = PCI_INVALID_IRQ;
/* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
pin--;
ACPI_SERIAL_BEGIN(pcib);
/* Search for a matching entry in the routing table. */
pr.pr_entry = NULL;
pr.pr_pin = pin;
pr.pr_slot = pci_get_slot(dev);
prt_walk_table(prtbuf, prt_lookup_device, &pr);
if (pr.pr_entry == NULL)
return (PCI_INVALID_IRQ);
prt = pr.pr_entry;
if (bootverbose) {
device_printf(pcib, "matched entry for %d.%d.INT%c",
pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
if (prt->Source != NULL && prt->Source[0] != '\0')
printf(" (src %s:%u)", prt->Source, prt->SourceIndex);
printf("\n");
}
/*
* If source is empty/NULL, the source index is a global IRQ number
* and it's hard-wired so we're done.
*/
if (prt->Source == NULL || prt->Source[0] == '\0') {
if (bootverbose)
device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
if (prt->SourceIndex)
interrupt = prt->SourceIndex;
else
device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
goto out;
}
/*
* We have to find the source device (PCI interrupt link device).
*/
if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
prt->Source);
goto out;
}
interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
prt->SourceIndex);
if (bootverbose && PCI_INTERRUPT_VALID(interrupt))
device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
out:
ACPI_SERIAL_END(pcib);
return_VALUE (interrupt);
}