/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2010 Hudson River Trading LLC
* Written by: John H. Baldwin <jhb@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.
*/
/*
* This driver provides a pseudo-bus to enumerate the PCI buses
* present on a system using a QPI chipset. It creates a qpi0 bus that
* is a child of nexus0 and then creates Host-PCI bridges as a
* child of that.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <sys/systm.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
#include <x86/legacyvar.h>
#include <x86/pci_cfgreg.h>
#include <x86/specialreg.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
struct qpi_device {
int qd_pcibus;
};
static MALLOC_DEFINE(M_QPI, "qpidrv", "qpi system device");
static void
qpi_identify(driver_t *driver, device_t parent)
{
int do_qpi;
/* Check CPUID to ensure this is an i7 CPU of some sort. */
if (cpu_vendor_id != CPU_VENDOR_INTEL ||
CPUID_TO_FAMILY(cpu_id) != 0x6)
return;
/* Only discover buses with configuration devices if allowed by user */
do_qpi = 0;
TUNABLE_INT_FETCH("hw.attach_intel_csr_pci", &do_qpi);
if (!do_qpi)
return;
/* PCI config register access is required. */
if (pci_cfgregopen() == 0)
return;
/* Add a qpi bus device. */
if (BUS_ADD_CHILD(parent, 20, "qpi", -1) == NULL)
panic("Failed to add qpi bus");
}
static int
qpi_probe(device_t dev)
{
device_set_desc(dev, "QPI system bus");
return (BUS_PROBE_SPECIFIC);
}
/*
* Look for a PCI bus with the specified bus address. If one is found,
* add a pcib device and return 0. Otherwise, return an error code.
*/
static int
qpi_probe_pcib(device_t dev, int bus)
{
struct qpi_device *qdev;
device_t child;
uint32_t devid;
int s;
/*
* If a PCI bus already exists for this bus number, then
* fail.
*/
if (pci_find_bsf(bus, 0, 0) != NULL)
return (EEXIST);
/*
* Attempt to read the device id for every slot, function 0 on
* the bus. If all read values are 0xffffffff this means that
* the bus is not present.
*/
for (s = 0; s <= PCI_SLOTMAX; s++) {
devid = pci_cfgregread(bus, s, 0, PCIR_DEVVENDOR, 4);
if (devid != 0xffffffff)
break;
}
if (devid == 0xffffffff)
return (ENOENT);
if ((devid & 0xffff) != 0x8086) {
if (bootverbose)
device_printf(dev,
"Device at pci%d.%d.0 has non-Intel vendor 0x%x\n",
bus, s, devid & 0xffff);
return (ENXIO);
}
child = BUS_ADD_CHILD(dev, 0, "pcib", -1);
if (child == NULL)
panic("%s: failed to add pci bus %d", device_get_nameunit(dev),
bus);
qdev = malloc(sizeof(struct qpi_device), M_QPI, M_WAITOK);
qdev->qd_pcibus = bus;
device_set_ivars(child, qdev);
return (0);
}
static int
qpi_attach(device_t dev)
{
int bus;
/*
* Each processor socket has a dedicated PCI bus, sometimes
* not enumerated by ACPI. Probe all unattached buses from 0
* to 255.
*/
for (bus = PCI_BUSMAX; bus >= 0; bus--)
qpi_probe_pcib(dev, bus);
return (bus_generic_attach(dev));
}
static int
qpi_print_child(device_t bus, device_t child)
{
struct qpi_device *qdev;
int retval = 0;
qdev = device_get_ivars(child);
retval += bus_print_child_header(bus, child);
if (qdev->qd_pcibus != -1)
retval += printf(" pcibus %d", qdev->qd_pcibus);
retval += bus_print_child_footer(bus, child);
return (retval);
}
static int
qpi_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct qpi_device *qdev;
qdev = device_get_ivars(child);
switch (which) {
case PCIB_IVAR_BUS:
*result = qdev->qd_pcibus;
break;
default:
return (ENOENT);
}
return (0);
}
static device_method_t qpi_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, qpi_identify),
DEVMETHOD(device_probe, qpi_probe),
DEVMETHOD(device_attach, qpi_attach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_print_child, qpi_print_child),
DEVMETHOD(bus_add_child, bus_generic_add_child),
DEVMETHOD(bus_read_ivar, qpi_read_ivar),
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
{ 0, 0 }
};
DEFINE_CLASS_0(qpi, qpi_driver, qpi_methods, 0);
DRIVER_MODULE(qpi, nexus, qpi_driver, 0, 0);
static int
qpi_pcib_probe(device_t dev)
{
device_set_desc(dev, "QPI Host-PCI bridge");
return (BUS_PROBE_SPECIFIC);
}
static int
qpi_pcib_attach(device_t dev)
{
device_add_child(dev, "pci", -1);
return (bus_generic_attach(dev));
}
static int
qpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
switch (which) {
case PCIB_IVAR_DOMAIN:
*result = 0;
return (0);
case PCIB_IVAR_BUS:
*result = pcib_get_bus(dev);
return (0);
default:
return (ENOENT);
}
}
#if defined(NEW_PCIB) && defined(PCI_RES_BUS)
static struct resource *
qpi_pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
if (type == PCI_RES_BUS)
return (pci_domain_alloc_bus(0, child, rid, start, end, count,
flags));
return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
count, flags));
}
#endif
static int
qpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
uint32_t *data)
{
device_t bus;
bus = device_get_parent(pcib);
return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data));
}
static device_method_t qpi_pcib_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, qpi_pcib_probe),
DEVMETHOD(device_attach, qpi_pcib_attach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* Bus interface */
DEVMETHOD(bus_read_ivar, qpi_pcib_read_ivar),
#if defined(NEW_PCIB) && defined(PCI_RES_BUS)
DEVMETHOD(bus_alloc_resource, qpi_pcib_alloc_resource),
DEVMETHOD(bus_adjust_resource, legacy_pcib_adjust_resource),
DEVMETHOD(bus_release_resource, legacy_pcib_release_resource),
#else
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
#endif
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
/* pcib interface */
DEVMETHOD(pcib_maxslots, pcib_maxslots),
DEVMETHOD(pcib_read_config, legacy_pcib_read_config),
DEVMETHOD(pcib_write_config, legacy_pcib_write_config),
DEVMETHOD(pcib_alloc_msi, legacy_pcib_alloc_msi),
DEVMETHOD(pcib_release_msi, pcib_release_msi),
DEVMETHOD(pcib_alloc_msix, legacy_pcib_alloc_msix),
DEVMETHOD(pcib_release_msix, pcib_release_msix),
DEVMETHOD(pcib_map_msi, qpi_pcib_map_msi),
DEVMETHOD_END
};
DEFINE_CLASS_0(pcib, qpi_pcib_driver, qpi_pcib_methods, 0);
DRIVER_MODULE(pcib, qpi, qpi_pcib_driver, 0, 0);
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