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freebsd-dev/sys/dev/acpica/acpi_pci_link.c
John Baldwin a04725cd5c Detect invalid PCI devices more correctly in PCI interrupt router drivers. 
- Check for an invalid device (vendor is invalid) before reading the
  header type register when examining function 0 of a possible device.
- When iterating over functions of a device, reject any device whose
  16-bit vendor is invalid rather than requiring the full 32-bit
  vendor+device to be all 1's.  In practice the latter check is
  probably fine, but checking the vendor is what the PCI spec
  recommends.

Reviewed by:	imp
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D21147
2019-08-06 23:15:04 +00:00

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/*-
* Copyright (c) 2002 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
* 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/kernel.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <contrib/dev/acpica/include/acpi.h>
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpi_pcibvar.h>
#include <machine/pci_cfgreg.h>
#include <dev/pci/pcireg.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_LINK")
ACPI_SERIAL_DECL(pci_link, "ACPI PCI link");
#define NUM_ISA_INTERRUPTS 16
#define NUM_ACPI_INTERRUPTS 256
/*
* An ACPI PCI link device may contain multiple links. Each link has its
* own ACPI resource. _PRT entries specify which link is being used via
* the Source Index.
*
* XXX: A note about Source Indices and DPFs: Currently we assume that
* the DPF start and end tags are not counted towards the index that
* Source Index corresponds to. Also, we assume that when DPFs are in use
* they various sets overlap in terms of Indices. Here's an example
* resource list indicating these assumptions:
*
* Resource Index
* -------- -----
* I/O Port 0
* Start DPF -
* IRQ 1
* MemIO 2
* Start DPF -
* IRQ 1
* MemIO 2
* End DPF -
* DMA Channel 3
*
* The XXX is because I'm not sure if this is a valid assumption to make.
*/
/* States during DPF processing. */
#define DPF_OUTSIDE 0
#define DPF_FIRST 1
#define DPF_IGNORE 2
struct link;
struct acpi_pci_link_softc {
int pl_num_links;
int pl_crs_bad;
struct link *pl_links;
device_t pl_dev;
};
struct link {
struct acpi_pci_link_softc *l_sc;
uint8_t l_bios_irq;
uint8_t l_irq;
uint8_t l_initial_irq;
UINT32 l_crs_type;
int l_res_index;
int l_num_irqs;
int *l_irqs;
int l_references;
int l_routed:1;
int l_isa_irq:1;
ACPI_RESOURCE l_prs_template;
};
struct link_count_request {
int in_dpf;
int count;
};
struct link_res_request {
struct acpi_pci_link_softc *sc;
int in_dpf;
int res_index;
int link_index;
};
static MALLOC_DEFINE(M_PCI_LINK, "pci_link", "ACPI PCI Link structures");
static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS];
static int pci_link_bios_isa_irqs;
static char *pci_link_ids[] = { "PNP0C0F", NULL };
/*
* Fetch the short name associated with an ACPI handle and save it in the
* passed in buffer.
*/
static ACPI_STATUS
acpi_short_name(ACPI_HANDLE handle, char *buffer, size_t buflen)
{
ACPI_BUFFER buf;
buf.Length = buflen;
buf.Pointer = buffer;
return (AcpiGetName(handle, ACPI_SINGLE_NAME, &buf));
}
static int
acpi_pci_link_probe(device_t dev)
{
char descr[28], name[12];
int rv;
/*
* We explicitly do not check _STA since not all systems set it to
* sensible values.
*/
if (acpi_disabled("pci_link"))
return (ENXIO);
rv = ACPI_ID_PROBE(device_get_parent(dev), dev, pci_link_ids, NULL);
if (rv > 0)
return (rv);
if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), name,
sizeof(name)))) {
snprintf(descr, sizeof(descr), "ACPI PCI Link %s", name);
device_set_desc_copy(dev, descr);
} else
device_set_desc(dev, "ACPI PCI Link");
device_quiet(dev);
return (rv);
}
static ACPI_STATUS
acpi_count_irq_resources(ACPI_RESOURCE *res, void *context)
{
struct link_count_request *req;
req = (struct link_count_request *)context;
switch (res->Type) {
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
switch (req->in_dpf) {
case DPF_OUTSIDE:
/* We've started the first DPF. */
req->in_dpf = DPF_FIRST;
break;
case DPF_FIRST:
/* We've started the second DPF. */
req->in_dpf = DPF_IGNORE;
break;
}
break;
case ACPI_RESOURCE_TYPE_END_DEPENDENT:
/* We are finished with DPF parsing. */
KASSERT(req->in_dpf != DPF_OUTSIDE,
("%s: end dpf when not parsing a dpf", __func__));
req->in_dpf = DPF_OUTSIDE;
break;
case ACPI_RESOURCE_TYPE_IRQ:
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
/*
* Don't count resources if we are in a DPF set that we are
* ignoring.
*/
if (req->in_dpf != DPF_IGNORE)
req->count++;
}
return (AE_OK);
}
static ACPI_STATUS
link_add_crs(ACPI_RESOURCE *res, void *context)
{
struct link_res_request *req;
struct link *link;
ACPI_SERIAL_ASSERT(pci_link);
req = (struct link_res_request *)context;
switch (res->Type) {
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
switch (req->in_dpf) {
case DPF_OUTSIDE:
/* We've started the first DPF. */
req->in_dpf = DPF_FIRST;
break;
case DPF_FIRST:
/* We've started the second DPF. */
panic(
"%s: Multiple dependent functions within a current resource",
__func__);
break;
}
break;
case ACPI_RESOURCE_TYPE_END_DEPENDENT:
/* We are finished with DPF parsing. */
KASSERT(req->in_dpf != DPF_OUTSIDE,
("%s: end dpf when not parsing a dpf", __func__));
req->in_dpf = DPF_OUTSIDE;
break;
case ACPI_RESOURCE_TYPE_IRQ:
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
KASSERT(req->link_index < req->sc->pl_num_links,
("%s: array boundary violation", __func__));
link = &req->sc->pl_links[req->link_index];
link->l_res_index = req->res_index;
link->l_crs_type = res->Type;
req->link_index++;
req->res_index++;
/*
* Only use the current value if there's one IRQ. Some
* systems return multiple IRQs (which is nonsense for _CRS)
* when the link hasn't been programmed.
*/
if (res->Type == ACPI_RESOURCE_TYPE_IRQ) {
if (res->Data.Irq.InterruptCount == 1)
link->l_irq = res->Data.Irq.Interrupts[0];
} else if (res->Data.ExtendedIrq.InterruptCount == 1)
link->l_irq = res->Data.ExtendedIrq.Interrupts[0];
/*
* An IRQ of zero means that the link isn't routed.
*/
if (link->l_irq == 0)
link->l_irq = PCI_INVALID_IRQ;
break;
default:
req->res_index++;
}
return (AE_OK);
}
/*
* Populate the set of possible IRQs for each device.
*/
static ACPI_STATUS
link_add_prs(ACPI_RESOURCE *res, void *context)
{
ACPI_RESOURCE *tmp;
struct link_res_request *req;
struct link *link;
UINT8 *irqs = NULL;
UINT32 *ext_irqs = NULL;
int i, is_ext_irq = 1;
ACPI_SERIAL_ASSERT(pci_link);
req = (struct link_res_request *)context;
switch (res->Type) {
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
switch (req->in_dpf) {
case DPF_OUTSIDE:
/* We've started the first DPF. */
req->in_dpf = DPF_FIRST;
break;
case DPF_FIRST:
/* We've started the second DPF. */
req->in_dpf = DPF_IGNORE;
break;
}
break;
case ACPI_RESOURCE_TYPE_END_DEPENDENT:
/* We are finished with DPF parsing. */
KASSERT(req->in_dpf != DPF_OUTSIDE,
("%s: end dpf when not parsing a dpf", __func__));
req->in_dpf = DPF_OUTSIDE;
break;
case ACPI_RESOURCE_TYPE_IRQ:
is_ext_irq = 0;
/* fall through */
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
/*
* Don't parse resources if we are in a DPF set that we are
* ignoring.
*/
if (req->in_dpf == DPF_IGNORE)
break;
KASSERT(req->link_index < req->sc->pl_num_links,
("%s: array boundary violation", __func__));
link = &req->sc->pl_links[req->link_index];
if (link->l_res_index == -1) {
KASSERT(req->sc->pl_crs_bad,
("res_index should be set"));
link->l_res_index = req->res_index;
}
req->link_index++;
req->res_index++;
/*
* Stash a copy of the resource for later use when doing
* _SRS.
*/
tmp = &link->l_prs_template;
if (is_ext_irq) {
bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.ExtendedIrq));
/*
* XXX acpi_AppendBufferResource() cannot handle
* optional data.
*/
bzero(&tmp->Data.ExtendedIrq.ResourceSource,
sizeof(tmp->Data.ExtendedIrq.ResourceSource));
tmp->Length = ACPI_RS_SIZE(tmp->Data.ExtendedIrq);
link->l_num_irqs =
res->Data.ExtendedIrq.InterruptCount;
ext_irqs = res->Data.ExtendedIrq.Interrupts;
} else {
bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.Irq));
link->l_num_irqs = res->Data.Irq.InterruptCount;
irqs = res->Data.Irq.Interrupts;
}
if (link->l_num_irqs == 0)
break;
/*
* Save a list of the valid IRQs. Also, if all of the
* valid IRQs are ISA IRQs, then mark this link as
* routed via an ISA interrupt.
*/
link->l_isa_irq = TRUE;
link->l_irqs = malloc(sizeof(int) * link->l_num_irqs,
M_PCI_LINK, M_WAITOK | M_ZERO);
for (i = 0; i < link->l_num_irqs; i++) {
if (is_ext_irq) {
link->l_irqs[i] = ext_irqs[i];
if (ext_irqs[i] >= NUM_ISA_INTERRUPTS)
link->l_isa_irq = FALSE;
} else {
link->l_irqs[i] = irqs[i];
if (irqs[i] >= NUM_ISA_INTERRUPTS)
link->l_isa_irq = FALSE;
}
}
/*
* If this is not an ISA IRQ but _CRS used a non-extended
* IRQ descriptor, don't use _CRS as a template for _SRS.
*/
if (!req->sc->pl_crs_bad && !link->l_isa_irq &&
link->l_crs_type == ACPI_RESOURCE_TYPE_IRQ)
req->sc->pl_crs_bad = TRUE;
break;
default:
if (req->in_dpf == DPF_IGNORE)
break;
if (req->sc->pl_crs_bad)
device_printf(req->sc->pl_dev,
"Warning: possible resource %d will be lost during _SRS\n",
req->res_index);
req->res_index++;
}
return (AE_OK);
}
static int
link_valid_irq(struct link *link, int irq)
{
int i;
ACPI_SERIAL_ASSERT(pci_link);
/* Invalid interrupts are never valid. */
if (!PCI_INTERRUPT_VALID(irq))
return (FALSE);
/* Any interrupt in the list of possible interrupts is valid. */
for (i = 0; i < link->l_num_irqs; i++)
if (link->l_irqs[i] == irq)
return (TRUE);
/*
* For links routed via an ISA interrupt, if the SCI is routed via
* an ISA interrupt, the SCI is always treated as a valid IRQ.
*/
if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq &&
irq < NUM_ISA_INTERRUPTS)
return (TRUE);
/* If the interrupt wasn't found in the list it is not valid. */
return (FALSE);
}
static void
acpi_pci_link_dump(struct acpi_pci_link_softc *sc, int header, const char *tag)
{
struct link *link;
char buf[16];
int i, j;
ACPI_SERIAL_ASSERT(pci_link);
if (header) {
snprintf(buf, sizeof(buf), "%s:",
device_get_nameunit(sc->pl_dev));
printf("%-16.16s Index IRQ Rtd Ref IRQs\n", buf);
}
for (i = 0; i < sc->pl_num_links; i++) {
link = &sc->pl_links[i];
printf(" %-14.14s %5d %3d %c %3d ", i == 0 ? tag : "", i,
link->l_irq, link->l_routed ? 'Y' : 'N',
link->l_references);
if (link->l_num_irqs == 0)
printf(" none");
else for (j = 0; j < link->l_num_irqs; j++)
printf(" %d", link->l_irqs[j]);
printf("\n");
}
}
static int
acpi_pci_link_attach(device_t dev)
{
struct acpi_pci_link_softc *sc;
struct link_count_request creq;
struct link_res_request rreq;
ACPI_STATUS status;
int i;
sc = device_get_softc(dev);
sc->pl_dev = dev;
ACPI_SERIAL_BEGIN(pci_link);
/*
* Count the number of current resources so we know how big of
* a link array to allocate. On some systems, _CRS is broken,
* so for those systems try to derive the count from _PRS instead.
*/
creq.in_dpf = DPF_OUTSIDE;
creq.count = 0;
status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
acpi_count_irq_resources, &creq);
sc->pl_crs_bad = ACPI_FAILURE(status);
if (sc->pl_crs_bad) {
creq.in_dpf = DPF_OUTSIDE;
creq.count = 0;
status = AcpiWalkResources(acpi_get_handle(dev), "_PRS",
acpi_count_irq_resources, &creq);
if (ACPI_FAILURE(status)) {
device_printf(dev,
"Unable to parse _CRS or _PRS: %s\n",
AcpiFormatException(status));
ACPI_SERIAL_END(pci_link);
return (ENXIO);
}
}
sc->pl_num_links = creq.count;
if (creq.count == 0) {
ACPI_SERIAL_END(pci_link);
return (0);
}
sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links,
M_PCI_LINK, M_WAITOK | M_ZERO);
/* Initialize the child links. */
for (i = 0; i < sc->pl_num_links; i++) {
sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ;
sc->pl_links[i].l_sc = sc;
sc->pl_links[i].l_isa_irq = FALSE;
sc->pl_links[i].l_res_index = -1;
}
/* Try to read the current settings from _CRS if it is valid. */
if (!sc->pl_crs_bad) {
rreq.in_dpf = DPF_OUTSIDE;
rreq.link_index = 0;
rreq.res_index = 0;
rreq.sc = sc;
status = AcpiWalkResources(acpi_get_handle(dev), "_CRS",
link_add_crs, &rreq);
if (ACPI_FAILURE(status)) {
device_printf(dev, "Unable to parse _CRS: %s\n",
AcpiFormatException(status));
goto fail;
}
}
/*
* Try to read the possible settings from _PRS. Note that if the
* _CRS is toast, we depend on having a working _PRS. However, if
* _CRS works, then it is ok for _PRS to be missing.
*/
rreq.in_dpf = DPF_OUTSIDE;
rreq.link_index = 0;
rreq.res_index = 0;
rreq.sc = sc;
status = AcpiWalkResources(acpi_get_handle(dev), "_PRS",
link_add_prs, &rreq);
if (ACPI_FAILURE(status) &&
(status != AE_NOT_FOUND || sc->pl_crs_bad)) {
device_printf(dev, "Unable to parse _PRS: %s\n",
AcpiFormatException(status));
goto fail;
}
if (bootverbose)
acpi_pci_link_dump(sc, 1, "Initial Probe");
/* Verify initial IRQs if we have _PRS. */
if (status != AE_NOT_FOUND)
for (i = 0; i < sc->pl_num_links; i++)
if (!link_valid_irq(&sc->pl_links[i],
sc->pl_links[i].l_irq))
sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
if (bootverbose)
acpi_pci_link_dump(sc, 0, "Validation");
/* Save initial IRQs. */
for (i = 0; i < sc->pl_num_links; i++)
sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq;
/*
* Try to disable this link. If successful, set the current IRQ to
* zero and flags to indicate this link is not routed. If we can't
* run _DIS (i.e., the method doesn't exist), assume the initial
* IRQ was routed by the BIOS.
*/
if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL,
NULL)))
for (i = 0; i < sc->pl_num_links; i++)
sc->pl_links[i].l_irq = PCI_INVALID_IRQ;
else
for (i = 0; i < sc->pl_num_links; i++)
if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq))
sc->pl_links[i].l_routed = TRUE;
if (bootverbose)
acpi_pci_link_dump(sc, 0, "After Disable");
ACPI_SERIAL_END(pci_link);
return (0);
fail:
ACPI_SERIAL_END(pci_link);
for (i = 0; i < sc->pl_num_links; i++)
if (sc->pl_links[i].l_irqs != NULL)
free(sc->pl_links[i].l_irqs, M_PCI_LINK);
free(sc->pl_links, M_PCI_LINK);
return (ENXIO);
}
/* XXX: Note that this is identical to pci_pir_search_irq(). */
static uint8_t
acpi_pci_link_search_irq(int bus, int device, int pin)
{
uint32_t value;
uint8_t func, maxfunc;
/* See if we have a valid device at function 0. */
value = pci_cfgregread(bus, device, 0, PCIR_VENDOR, 2);
if (value == PCIV_INVALID)
return (PCI_INVALID_IRQ);
value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
return (PCI_INVALID_IRQ);
if (value & PCIM_MFDEV)
maxfunc = PCI_FUNCMAX;
else
maxfunc = 0;
/* Scan all possible functions at this device. */
for (func = 0; func <= maxfunc; func++) {
value = pci_cfgregread(bus, device, func, PCIR_VENDOR, 2);
if (value == PCIV_INVALID)
continue;
value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
/*
* See if it uses the pin in question. Note that the passed
* in pin uses 0 for A, .. 3 for D whereas the intpin
* register uses 0 for no interrupt, 1 for A, .. 4 for D.
*/
if (value != pin + 1)
continue;
value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
if (bootverbose)
printf(
"ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n",
bus, device, pin + 'A', func, value);
if (value != PCI_INVALID_IRQ)
return (value);
}
return (PCI_INVALID_IRQ);
}
/*
* Find the link structure that corresponds to the resource index passed in
* via 'source_index'.
*/
static struct link *
acpi_pci_link_lookup(device_t dev, int source_index)
{
struct acpi_pci_link_softc *sc;
int i;
ACPI_SERIAL_ASSERT(pci_link);
sc = device_get_softc(dev);
for (i = 0; i < sc->pl_num_links; i++)
if (sc->pl_links[i].l_res_index == source_index)
return (&sc->pl_links[i]);
return (NULL);
}
void
acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot,
int pin)
{
struct link *link;
uint8_t bios_irq;
uintptr_t bus;
/*
* Look up the PCI bus for the specified PCI bridge device. Note
* that the PCI bridge device might not have any children yet.
* However, looking up its bus number doesn't require a valid child
* device, so we just pass NULL.
*/
if (BUS_READ_IVAR(pcib, NULL, PCIB_IVAR_BUS, &bus) != 0) {
device_printf(pcib, "Unable to read PCI bus number");
panic("PCI bridge without a bus number");
}
/* Bump the reference count. */
ACPI_SERIAL_BEGIN(pci_link);
link = acpi_pci_link_lookup(dev, index);
if (link == NULL) {
device_printf(dev, "apparently invalid index %d\n", index);
ACPI_SERIAL_END(pci_link);
return;
}
link->l_references++;
if (link->l_routed)
pci_link_interrupt_weights[link->l_irq]++;
/*
* The BIOS only routes interrupts via ISA IRQs using the ATPICs
* (8259As). Thus, if this link is routed via an ISA IRQ, go
* look to see if the BIOS routed an IRQ for this link at the
* indicated (bus, slot, pin). If so, we prefer that IRQ for
* this link and add that IRQ to our list of known-good IRQs.
* This provides a good work-around for link devices whose _CRS
* method is either broken or bogus. We only use the value
* returned by _CRS if we can't find a valid IRQ via this method
* in fact.
*
* If this link is not routed via an ISA IRQ (because we are using
* APIC for example), then don't bother looking up the BIOS IRQ
* as if we find one it won't be valid anyway.
*/
if (!link->l_isa_irq) {
ACPI_SERIAL_END(pci_link);
return;
}
/* Try to find a BIOS IRQ setting from any matching devices. */
bios_irq = acpi_pci_link_search_irq(bus, slot, pin);
if (!PCI_INTERRUPT_VALID(bios_irq)) {
ACPI_SERIAL_END(pci_link);
return;
}
/* Validate the BIOS IRQ. */
if (!link_valid_irq(link, bios_irq)) {
device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n",
bios_irq, (int)bus, slot, pin + 'A');
} else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) {
link->l_bios_irq = bios_irq;
if (bios_irq < NUM_ISA_INTERRUPTS)
pci_link_bios_isa_irqs |= (1 << bios_irq);
if (bios_irq != link->l_initial_irq &&
PCI_INTERRUPT_VALID(link->l_initial_irq))
device_printf(dev,
"BIOS IRQ %u does not match initial IRQ %u\n",
bios_irq, link->l_initial_irq);
} else if (bios_irq != link->l_bios_irq)
device_printf(dev,
"BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n",
bios_irq, (int)bus, slot, pin + 'A',
link->l_bios_irq);
ACPI_SERIAL_END(pci_link);
}
static ACPI_STATUS
acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf)
{
ACPI_RESOURCE *end, *res;
ACPI_STATUS status;
struct link *link;
int i, in_dpf;
/* Fetch the _CRS. */
ACPI_SERIAL_ASSERT(pci_link);
srsbuf->Pointer = NULL;
srsbuf->Length = ACPI_ALLOCATE_BUFFER;
status = AcpiGetCurrentResources(acpi_get_handle(sc->pl_dev), srsbuf);
if (ACPI_SUCCESS(status) && srsbuf->Pointer == NULL)
status = AE_NO_MEMORY;
if (ACPI_FAILURE(status)) {
if (bootverbose)
device_printf(sc->pl_dev,
"Unable to fetch current resources: %s\n",
AcpiFormatException(status));
return (status);
}
/* Fill in IRQ resources via link structures. */
link = sc->pl_links;
i = 0;
in_dpf = DPF_OUTSIDE;
res = (ACPI_RESOURCE *)srsbuf->Pointer;
end = (ACPI_RESOURCE *)((char *)srsbuf->Pointer + srsbuf->Length);
for (;;) {
switch (res->Type) {
case ACPI_RESOURCE_TYPE_START_DEPENDENT:
switch (in_dpf) {
case DPF_OUTSIDE:
/* We've started the first DPF. */
in_dpf = DPF_FIRST;
break;
case DPF_FIRST:
/* We've started the second DPF. */
panic(
"%s: Multiple dependent functions within a current resource",
__func__);
break;
}
break;
case ACPI_RESOURCE_TYPE_END_DEPENDENT:
/* We are finished with DPF parsing. */
KASSERT(in_dpf != DPF_OUTSIDE,
("%s: end dpf when not parsing a dpf", __func__));
in_dpf = DPF_OUTSIDE;
break;
case ACPI_RESOURCE_TYPE_IRQ:
MPASS(i < sc->pl_num_links);
res->Data.Irq.InterruptCount = 1;
if (PCI_INTERRUPT_VALID(link->l_irq)) {
KASSERT(link->l_irq < NUM_ISA_INTERRUPTS,
("%s: can't put non-ISA IRQ %d in legacy IRQ resource type",
__func__, link->l_irq));
res->Data.Irq.Interrupts[0] = link->l_irq;
} else
res->Data.Irq.Interrupts[0] = 0;
link++;
i++;
break;
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
MPASS(i < sc->pl_num_links);
res->Data.ExtendedIrq.InterruptCount = 1;
if (PCI_INTERRUPT_VALID(link->l_irq))
res->Data.ExtendedIrq.Interrupts[0] =
link->l_irq;
else
res->Data.ExtendedIrq.Interrupts[0] = 0;
link++;
i++;
break;
}
if (res->Type == ACPI_RESOURCE_TYPE_END_TAG)
break;
res = ACPI_NEXT_RESOURCE(res);
if (res >= end)
break;
}
return (AE_OK);
}
static ACPI_STATUS
acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc,
ACPI_BUFFER *srsbuf)
{
ACPI_RESOURCE newres;
ACPI_STATUS status;
struct link *link;
int i;
/* Start off with an empty buffer. */
srsbuf->Pointer = NULL;
link = sc->pl_links;
for (i = 0; i < sc->pl_num_links; i++) {
/* Add a new IRQ resource from each link. */
link = &sc->pl_links[i];
if (link->l_prs_template.Type == ACPI_RESOURCE_TYPE_IRQ) {
/* Build an IRQ resource. */
bcopy(&link->l_prs_template, &newres,
ACPI_RS_SIZE(newres.Data.Irq));
newres.Data.Irq.InterruptCount = 1;
if (PCI_INTERRUPT_VALID(link->l_irq)) {
KASSERT(link->l_irq < NUM_ISA_INTERRUPTS,
("%s: can't put non-ISA IRQ %d in legacy IRQ resource type",
__func__, link->l_irq));
newres.Data.Irq.Interrupts[0] = link->l_irq;
} else
newres.Data.Irq.Interrupts[0] = 0;
} else {
/* Build an ExtIRQ resuorce. */
bcopy(&link->l_prs_template, &newres,
ACPI_RS_SIZE(newres.Data.ExtendedIrq));
newres.Data.ExtendedIrq.InterruptCount = 1;
if (PCI_INTERRUPT_VALID(link->l_irq))
newres.Data.ExtendedIrq.Interrupts[0] =
link->l_irq;
else
newres.Data.ExtendedIrq.Interrupts[0] = 0;
}
/* Add the new resource to the end of the _SRS buffer. */
status = acpi_AppendBufferResource(srsbuf, &newres);
if (ACPI_FAILURE(status)) {
device_printf(sc->pl_dev,
"Unable to build resources: %s\n",
AcpiFormatException(status));
if (srsbuf->Pointer != NULL)
AcpiOsFree(srsbuf->Pointer);
return (status);
}
}
return (AE_OK);
}
static ACPI_STATUS
acpi_pci_link_route_irqs(device_t dev)
{
struct acpi_pci_link_softc *sc;
ACPI_RESOURCE *resource, *end;
ACPI_BUFFER srsbuf;
ACPI_STATUS status;
struct link *link;
int i;
ACPI_SERIAL_ASSERT(pci_link);
sc = device_get_softc(dev);
if (sc->pl_crs_bad)
status = acpi_pci_link_srs_from_links(sc, &srsbuf);
else
status = acpi_pci_link_srs_from_crs(sc, &srsbuf);
/* 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(srsbuf.Pointer);
return (status);
}
/*
* 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;
end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length);
for (;;) {
if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG)
break;
switch (resource->Type) {
case ACPI_RESOURCE_TYPE_IRQ:
case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
MPASS(i < sc->pl_num_links);
/*
* Only configure the interrupt and update the
* weights if this link has a valid IRQ and was
* previously unrouted.
*/
if (!link->l_routed &&
PCI_INTERRUPT_VALID(link->l_irq)) {
link->l_routed = TRUE;
acpi_config_intr(dev, resource);
pci_link_interrupt_weights[link->l_irq] +=
link->l_references;
}
link++;
i++;
break;
}
resource = ACPI_NEXT_RESOURCE(resource);
if (resource >= end)
break;
}
AcpiOsFree(srsbuf.Pointer);
return (AE_OK);
}
static int
acpi_pci_link_resume(device_t dev)
{
struct acpi_pci_link_softc *sc;
ACPI_STATUS status;
int i, routed;
/*
* If all of our links are routed, then restore the link via _SRS,
* otherwise, disable the link via _DIS.
*/
ACPI_SERIAL_BEGIN(pci_link);
sc = device_get_softc(dev);
routed = 0;
for (i = 0; i < sc->pl_num_links; i++)
if (sc->pl_links[i].l_routed)
routed++;
if (routed == sc->pl_num_links)
status = acpi_pci_link_route_irqs(dev);
else {
AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, NULL);
status = AE_OK;
}
ACPI_SERIAL_END(pci_link);
if (ACPI_FAILURE(status))
return (ENXIO);
else
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, ("%s: link already routed", __func__));
KASSERT(!PCI_INTERRUPT_VALID(link->l_irq),
("%s: link already has an IRQ", __func__));
/* Check for a tunable override. */
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)) {
if (!link_valid_irq(link, i))
device_printf(dev,
"Warning, IRQ %d is not listed as valid\n",
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)) {
if (!link_valid_irq(link, i))
device_printf(dev,
"Warning, IRQ %d is not listed as valid\n",
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.SciInterrupt;
pos_weight = pci_link_interrupt_weights[pos_irq];
if (pos_weight < best_weight) {
best_weight = pos_weight;
best_irq = pos_irq;
}
}
if (PCI_INTERRUPT_VALID(best_irq)) {
if (bootverbose)
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 link *link;
if (acpi_disabled("pci_link"))
return (PCI_INVALID_IRQ);
ACPI_SERIAL_BEGIN(pci_link);
link = acpi_pci_link_lookup(dev, index);
if (link == NULL)
panic("%s: apparently invalid index %d", __func__, 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.SciInterrupt < NUM_ISA_INTERRUPTS)
pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt);
}
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),
DEVMETHOD_END
};
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);
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