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pci_bus.c
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pci_early_quirks.c
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pci_early_quirks.h
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qpi.c
(8.64 KB)
Editing: qpi.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * 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> __FBSDID("$FreeBSD$"); #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 } }; static devclass_t qpi_devclass; DEFINE_CLASS_0(qpi, qpi_driver, qpi_methods, 0); DRIVER_MODULE(qpi, nexus, qpi_driver, qpi_devclass, 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 }; static devclass_t qpi_pcib_devclass; DEFINE_CLASS_0(pcib, qpi_pcib_driver, qpi_pcib_methods, 0); DRIVER_MODULE(pcib, qpi, qpi_pcib_driver, qpi_pcib_devclass, 0, 0);
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