/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2003 John Baldwin * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* These two arrays are indexed by APIC IDs. */ static struct { void *io_apic; UINT32 io_vector; } *ioapics; static struct lapic_info { u_int la_enabled; u_int la_acpi_id; } *lapics; int madt_found_sci_override; static ACPI_TABLE_MADT *madt; static vm_paddr_t madt_physaddr; static vm_offset_t madt_length; static MALLOC_DEFINE(M_MADT, "madt_table", "ACPI MADT Table Items"); static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source); static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source); static int madt_find_cpu(u_int acpi_id, u_int *apic_id); static int madt_find_interrupt(int intr, void **apic, u_int *pin); static void madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg); static void madt_parse_interrupt_override( ACPI_MADT_INTERRUPT_OVERRIDE *intr); static void madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused); static void madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi); static void madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi); static int madt_probe(void); static int madt_probe_cpus(void); static void madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg __unused); static void madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg __unused); static void madt_register(void *dummy); static int madt_setup_local(void); static int madt_setup_io(void); static void madt_walk_table(acpi_subtable_handler *handler, void *arg); static struct apic_enumerator madt_enumerator = { .apic_name = "MADT", .apic_probe = madt_probe, .apic_probe_cpus = madt_probe_cpus, .apic_setup_local = madt_setup_local, .apic_setup_io = madt_setup_io }; /* * Look for an ACPI Multiple APIC Description Table ("APIC") */ static int madt_probe(void) { madt_physaddr = acpi_find_table(ACPI_SIG_MADT); if (madt_physaddr == 0) return (ENXIO); return (-50); } /* * Run through the MP table enumerating CPUs. */ static int madt_probe_cpus(void) { madt = acpi_map_table(madt_physaddr, ACPI_SIG_MADT); madt_length = madt->Header.Length; KASSERT(madt != NULL, ("Unable to re-map MADT")); madt_walk_table(madt_probe_cpus_handler, NULL); acpi_unmap_table(madt); madt = NULL; return (0); } static const char *x2apic_sandy_dis[] = { "LENOVO", "ASUSTeK Computer Inc.", "SAMSUNG ELECTRONICS CO., LTD.", }; /* * Automatically detect several configurations where x2APIC mode is * known to cause troubles. User can override the setting with * hw.x2apic_enable tunable. */ static const char * madt_x2apic_disable_reason(void) { ACPI_TABLE_DMAR *dmartbl; vm_paddr_t dmartbl_physaddr; const char *reason; char *hw_vendor; u_int p[4]; int i; reason = NULL; dmartbl_physaddr = acpi_find_table(ACPI_SIG_DMAR); if (dmartbl_physaddr != 0) { dmartbl = acpi_map_table(dmartbl_physaddr, ACPI_SIG_DMAR); if ((dmartbl->Flags & ACPI_DMAR_X2APIC_OPT_OUT) != 0) reason = "by DMAR table"; acpi_unmap_table(dmartbl); if (reason != NULL) return (reason); } if (vm_guest == VM_GUEST_VMWARE) { vmware_hvcall(VMW_HVCMD_GETVCPU_INFO, p); if ((p[0] & VMW_VCPUINFO_VCPU_RESERVED) != 0 || (p[0] & VMW_VCPUINFO_LEGACY_X2APIC) == 0) return ("inside VMWare without intr redirection"); } if (vm_guest == VM_GUEST_NO && CPUID_TO_FAMILY(cpu_id) == 0x6 && CPUID_TO_MODEL(cpu_id) == 0x2a) { hw_vendor = kern_getenv("smbios.planar.maker"); /* * It seems that some SandyBridge-based notebook * BIOSes have a bug which prevents booting AP in * x2APIC mode. Since the only way to detect mobile * CPU is to check northbridge pci id, which cannot be * done that early, disable x2APIC for all such * machines. */ if (hw_vendor != NULL) { for (i = 0; i < nitems(x2apic_sandy_dis); i++) { if (strcmp(hw_vendor, x2apic_sandy_dis[i]) == 0) { reason = "for a suspected SandyBridge BIOS bug"; break; } } freeenv(hw_vendor); } if (reason != NULL) return (reason); } return (NULL); } /* * Initialize the local APIC on the BSP. */ static int madt_setup_local(void) { const char *reason; int user_x2apic; bool bios_x2apic; if ((cpu_feature2 & CPUID2_X2APIC) != 0) { reason = madt_x2apic_disable_reason(); bios_x2apic = lapic_is_x2apic(); if (reason != NULL && bios_x2apic) { if (bootverbose) printf("x2APIC should be disabled %s but " "already enabled by BIOS; enabling.\n", reason); reason = NULL; } if (reason == NULL) x2apic_mode = 1; else if (bootverbose) printf("x2APIC available but disabled %s\n", reason); user_x2apic = x2apic_mode; TUNABLE_INT_FETCH("hw.apic.x2apic_mode", &user_x2apic); if (user_x2apic != x2apic_mode) { if (bios_x2apic && !user_x2apic) printf("x2APIC disabled by tunable and " "enabled by BIOS; ignoring tunable."); else x2apic_mode = user_x2apic; } } /* * Truncate max_apic_id if not in x2APIC mode. Some structures * will already be allocated with the previous max_apic_id, but * at least we can prevent wasting more memory elsewhere. */ if (!x2apic_mode) max_apic_id = min(max_apic_id, xAPIC_MAX_APIC_ID); madt = pmap_mapbios(madt_physaddr, madt_length); lapics = malloc(sizeof(*lapics) * (max_apic_id + 1), M_MADT, M_WAITOK | M_ZERO); madt_walk_table(madt_setup_cpus_handler, NULL); lapic_init(madt->Address); printf("ACPI APIC Table: <%.*s %.*s>\n", (int)sizeof(madt->Header.OemId), madt->Header.OemId, (int)sizeof(madt->Header.OemTableId), madt->Header.OemTableId); /* * We ignore 64-bit local APIC override entries. Should we * perhaps emit a warning here if we find one? */ return (0); } /* * Enumerate I/O APICs and setup interrupt sources. */ static int madt_setup_io(void) { void *ioapic; u_int pin; int i; KASSERT(lapics != NULL, ("local APICs not initialized")); /* Try to initialize ACPI so that we can access the FADT. */ i = acpi_Startup(); if (ACPI_FAILURE(i)) { printf("MADT: ACPI Startup failed with %s\n", AcpiFormatException(i)); printf("Try disabling either ACPI or apic support.\n"); panic("Using MADT but ACPI doesn't work"); } ioapics = malloc(sizeof(*ioapics) * (IOAPIC_MAX_ID + 1), M_MADT, M_WAITOK | M_ZERO); /* First, we run through adding I/O APIC's. */ madt_walk_table(madt_parse_apics, NULL); /* Second, we run through the table tweaking interrupt sources. */ madt_walk_table(madt_parse_ints, NULL); /* * If there was not an explicit override entry for the SCI, * force it to use level trigger and active-low polarity. */ if (!madt_found_sci_override) { if (madt_find_interrupt(AcpiGbl_FADT.SciInterrupt, &ioapic, &pin) != 0) printf("MADT: Could not find APIC for SCI IRQ %u\n", AcpiGbl_FADT.SciInterrupt); else { printf( "MADT: Forcing active-low polarity and level trigger for SCI\n"); ioapic_set_polarity(ioapic, pin, INTR_POLARITY_LOW); ioapic_set_triggermode(ioapic, pin, INTR_TRIGGER_LEVEL); } } /* Third, we register all the I/O APIC's. */ for (i = 0; i <= IOAPIC_MAX_ID; i++) if (ioapics[i].io_apic != NULL) ioapic_register(ioapics[i].io_apic); /* Finally, we throw the switch to enable the I/O APIC's. */ acpi_SetDefaultIntrModel(ACPI_INTR_APIC); free(ioapics, M_MADT); ioapics = NULL; /* NB: this is the last use of the lapics array. */ free(lapics, M_MADT); lapics = NULL; return (0); } static void madt_register(void *dummy __unused) { apic_register_enumerator(&madt_enumerator); } SYSINIT(madt_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, madt_register, NULL); /* * Call the handler routine for each entry in the MADT table. */ static void madt_walk_table(acpi_subtable_handler *handler, void *arg) { acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length, handler, arg); } static void madt_parse_cpu(unsigned int apic_id, unsigned int flags) { if (!(flags & ACPI_MADT_ENABLED) || #ifdef SMP mp_ncpus == MAXCPU || #endif apic_id > MAX_APIC_ID) return; #ifdef SMP mp_ncpus++; mp_maxid = mp_ncpus - 1; #endif max_apic_id = max(apic_id, max_apic_id); } static void madt_add_cpu(u_int acpi_id, u_int apic_id, u_int flags) { struct lapic_info *la; /* * The MADT does not include a BSP flag, so we have to let the * MP code figure out which CPU is the BSP on its own. */ if (bootverbose) printf("MADT: Found CPU APIC ID %u ACPI ID %u: %s\n", apic_id, acpi_id, flags & ACPI_MADT_ENABLED ? "enabled" : "disabled"); if (!(flags & ACPI_MADT_ENABLED)) return; if (apic_id > max_apic_id) { printf("MADT: Ignoring local APIC ID %u (too high)\n", apic_id); return; } la = &lapics[apic_id]; KASSERT(la->la_enabled == 0, ("Duplicate local APIC ID %u", apic_id)); la->la_enabled = 1; la->la_acpi_id = acpi_id; lapic_create(apic_id, 0); } static void madt_probe_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg) { ACPI_MADT_LOCAL_APIC *proc; ACPI_MADT_LOCAL_X2APIC *x2apic; switch (entry->Type) { case ACPI_MADT_TYPE_LOCAL_APIC: proc = (ACPI_MADT_LOCAL_APIC *)entry; madt_parse_cpu(proc->Id, proc->LapicFlags); break; case ACPI_MADT_TYPE_LOCAL_X2APIC: x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry; madt_parse_cpu(x2apic->LocalApicId, x2apic->LapicFlags); break; } } static void madt_setup_cpus_handler(ACPI_SUBTABLE_HEADER *entry, void *arg) { ACPI_MADT_LOCAL_APIC *proc; ACPI_MADT_LOCAL_X2APIC *x2apic; switch (entry->Type) { case ACPI_MADT_TYPE_LOCAL_APIC: proc = (ACPI_MADT_LOCAL_APIC *)entry; madt_add_cpu(proc->ProcessorId, proc->Id, proc->LapicFlags); break; case ACPI_MADT_TYPE_LOCAL_X2APIC: x2apic = (ACPI_MADT_LOCAL_X2APIC *)entry; madt_add_cpu(x2apic->Uid, x2apic->LocalApicId, x2apic->LapicFlags); break; } } /* * Add an I/O APIC from an entry in the table. */ static void madt_parse_apics(ACPI_SUBTABLE_HEADER *entry, void *arg __unused) { ACPI_MADT_IO_APIC *apic; switch (entry->Type) { case ACPI_MADT_TYPE_IO_APIC: apic = (ACPI_MADT_IO_APIC *)entry; if (bootverbose) printf( "MADT: Found IO APIC ID %u, Interrupt %u at %p\n", apic->Id, apic->GlobalIrqBase, (void *)(uintptr_t)apic->Address); if (apic->Id > IOAPIC_MAX_ID) panic("%s: I/O APIC ID %u too high", __func__, apic->Id); if (ioapics[apic->Id].io_apic != NULL) panic("%s: Double APIC ID %u", __func__, apic->Id); ioapics[apic->Id].io_apic = ioapic_create(apic->Address, apic->Id, apic->GlobalIrqBase); ioapics[apic->Id].io_vector = apic->GlobalIrqBase; break; default: break; } } /* * Determine properties of an interrupt source. Note that for ACPI these * functions are only used for ISA interrupts, so we assume ISA bus values * (Active Hi, Edge Triggered) for conforming values except for the ACPI * SCI for which we use Active Lo, Level Triggered. */ static enum intr_polarity interrupt_polarity(UINT16 IntiFlags, UINT8 Source) { switch (IntiFlags & ACPI_MADT_POLARITY_MASK) { default: printf("WARNING: Bogus Interrupt Polarity. Assume CONFORMS\n"); /* FALLTHROUGH*/ case ACPI_MADT_POLARITY_CONFORMS: if (Source == AcpiGbl_FADT.SciInterrupt) return (INTR_POLARITY_LOW); else return (INTR_POLARITY_HIGH); case ACPI_MADT_POLARITY_ACTIVE_HIGH: return (INTR_POLARITY_HIGH); case ACPI_MADT_POLARITY_ACTIVE_LOW: return (INTR_POLARITY_LOW); } } static enum intr_trigger interrupt_trigger(UINT16 IntiFlags, UINT8 Source) { switch (IntiFlags & ACPI_MADT_TRIGGER_MASK) { default: printf("WARNING: Bogus Interrupt Trigger Mode. Assume CONFORMS.\n"); /*FALLTHROUGH*/ case ACPI_MADT_TRIGGER_CONFORMS: if (Source == AcpiGbl_FADT.SciInterrupt) return (INTR_TRIGGER_LEVEL); else return (INTR_TRIGGER_EDGE); case ACPI_MADT_TRIGGER_EDGE: return (INTR_TRIGGER_EDGE); case ACPI_MADT_TRIGGER_LEVEL: return (INTR_TRIGGER_LEVEL); } } /* * Find the local APIC ID associated with a given ACPI Processor ID. */ static int madt_find_cpu(u_int acpi_id, u_int *apic_id) { int i; for (i = 0; i <= max_apic_id; i++) { if (!lapics[i].la_enabled) continue; if (lapics[i].la_acpi_id != acpi_id) continue; *apic_id = i; return (0); } return (ENOENT); } /* * Find the IO APIC and pin on that APIC associated with a given global * interrupt. */ static int madt_find_interrupt(int intr, void **apic, u_int *pin) { int i, best; best = -1; for (i = 0; i <= IOAPIC_MAX_ID; i++) { if (ioapics[i].io_apic == NULL || ioapics[i].io_vector > intr) continue; if (best == -1 || ioapics[best].io_vector < ioapics[i].io_vector) best = i; } if (best == -1) return (ENOENT); *apic = ioapics[best].io_apic; *pin = intr - ioapics[best].io_vector; if (*pin > 32) printf("WARNING: Found intpin of %u for vector %d\n", *pin, intr); return (0); } void madt_parse_interrupt_values(void *entry, enum intr_trigger *trig, enum intr_polarity *pol) { ACPI_MADT_INTERRUPT_OVERRIDE *intr; char buf[64]; intr = entry; if (bootverbose) printf("MADT: Interrupt override: source %u, irq %u\n", intr->SourceIrq, intr->GlobalIrq); KASSERT(intr->Bus == 0, ("bus for interrupt overrides must be zero")); /* * Lookup the appropriate trigger and polarity modes for this * entry. */ *trig = interrupt_trigger(intr->IntiFlags, intr->SourceIrq); *pol = interrupt_polarity(intr->IntiFlags, intr->SourceIrq); /* * If the SCI is identity mapped but has edge trigger and * active-hi polarity or the force_sci_lo tunable is set, * force it to use level/lo. */ if (intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) { madt_found_sci_override = 1; if (getenv_string("hw.acpi.sci.trigger", buf, sizeof(buf))) { if (tolower(buf[0]) == 'e') *trig = INTR_TRIGGER_EDGE; else if (tolower(buf[0]) == 'l') *trig = INTR_TRIGGER_LEVEL; else panic( "Invalid trigger %s: must be 'edge' or 'level'", buf); printf("MADT: Forcing SCI to %s trigger\n", *trig == INTR_TRIGGER_EDGE ? "edge" : "level"); } if (getenv_string("hw.acpi.sci.polarity", buf, sizeof(buf))) { if (tolower(buf[0]) == 'h') *pol = INTR_POLARITY_HIGH; else if (tolower(buf[0]) == 'l') *pol = INTR_POLARITY_LOW; else panic( "Invalid polarity %s: must be 'high' or 'low'", buf); printf("MADT: Forcing SCI to active %s polarity\n", *pol == INTR_POLARITY_HIGH ? "high" : "low"); } } } /* * Parse an interrupt source override for an ISA interrupt. */ static void madt_parse_interrupt_override(ACPI_MADT_INTERRUPT_OVERRIDE *intr) { void *new_ioapic, *old_ioapic; u_int new_pin, old_pin; enum intr_trigger trig; enum intr_polarity pol; if (acpi_quirks & ACPI_Q_MADT_IRQ0 && intr->SourceIrq == 0 && intr->GlobalIrq == 2) { if (bootverbose) printf("MADT: Skipping timer override\n"); return; } if (madt_find_interrupt(intr->GlobalIrq, &new_ioapic, &new_pin) != 0) { printf("MADT: Could not find APIC for vector %u (IRQ %u)\n", intr->GlobalIrq, intr->SourceIrq); return; } madt_parse_interrupt_values(intr, &trig, &pol); /* Remap the IRQ if it is mapped to a different interrupt vector. */ if (intr->SourceIrq != intr->GlobalIrq) { /* * If the SCI is remapped to a non-ISA global interrupt, * then override the vector we use to setup and allocate * the interrupt. */ if (intr->GlobalIrq > 15 && intr->SourceIrq == AcpiGbl_FADT.SciInterrupt) acpi_OverrideInterruptLevel(intr->GlobalIrq); else ioapic_remap_vector(new_ioapic, new_pin, intr->SourceIrq); if (madt_find_interrupt(intr->SourceIrq, &old_ioapic, &old_pin) != 0) printf("MADT: Could not find APIC for source IRQ %u\n", intr->SourceIrq); else if (ioapic_get_vector(old_ioapic, old_pin) == intr->SourceIrq) ioapic_disable_pin(old_ioapic, old_pin); } /* Program the polarity and trigger mode. */ ioapic_set_triggermode(new_ioapic, new_pin, trig); ioapic_set_polarity(new_ioapic, new_pin, pol); } /* * Parse an entry for an NMI routed to an IO APIC. */ static void madt_parse_nmi(ACPI_MADT_NMI_SOURCE *nmi) { void *ioapic; u_int pin; if (madt_find_interrupt(nmi->GlobalIrq, &ioapic, &pin) != 0) { printf("MADT: Could not find APIC for vector %u\n", nmi->GlobalIrq); return; } ioapic_set_nmi(ioapic, pin); if (!(nmi->IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) ioapic_set_triggermode(ioapic, pin, interrupt_trigger(nmi->IntiFlags, 0)); if (!(nmi->IntiFlags & ACPI_MADT_POLARITY_CONFORMS)) ioapic_set_polarity(ioapic, pin, interrupt_polarity(nmi->IntiFlags, 0)); } /* * Parse an entry for an NMI routed to a local APIC LVT pin. */ static void madt_handle_local_nmi(u_int acpi_id, UINT8 Lint, UINT16 IntiFlags) { u_int apic_id, pin; if (acpi_id == 0xffffffff) apic_id = APIC_ID_ALL; else if (madt_find_cpu(acpi_id, &apic_id) != 0) { if (bootverbose) printf("MADT: Ignoring local NMI routed to " "ACPI CPU %u\n", acpi_id); return; } if (Lint == 0) pin = APIC_LVT_LINT0; else pin = APIC_LVT_LINT1; lapic_set_lvt_mode(apic_id, pin, APIC_LVT_DM_NMI); if (!(IntiFlags & ACPI_MADT_TRIGGER_CONFORMS)) lapic_set_lvt_triggermode(apic_id, pin, interrupt_trigger(IntiFlags, 0)); if (!(IntiFlags & ACPI_MADT_POLARITY_CONFORMS)) lapic_set_lvt_polarity(apic_id, pin, interrupt_polarity(IntiFlags, 0)); } static void madt_parse_local_nmi(ACPI_MADT_LOCAL_APIC_NMI *nmi) { madt_handle_local_nmi(nmi->ProcessorId == 0xff ? 0xffffffff : nmi->ProcessorId, nmi->Lint, nmi->IntiFlags); } static void madt_parse_local_x2apic_nmi(ACPI_MADT_LOCAL_X2APIC_NMI *nmi) { madt_handle_local_nmi(nmi->Uid, nmi->Lint, nmi->IntiFlags); } /* * Parse interrupt entries. */ static void madt_parse_ints(ACPI_SUBTABLE_HEADER *entry, void *arg __unused) { switch (entry->Type) { case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE: madt_parse_interrupt_override( (ACPI_MADT_INTERRUPT_OVERRIDE *)entry); break; case ACPI_MADT_TYPE_NMI_SOURCE: madt_parse_nmi((ACPI_MADT_NMI_SOURCE *)entry); break; case ACPI_MADT_TYPE_LOCAL_APIC_NMI: madt_parse_local_nmi((ACPI_MADT_LOCAL_APIC_NMI *)entry); break; case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI: madt_parse_local_x2apic_nmi( (ACPI_MADT_LOCAL_X2APIC_NMI *)entry); break; } } /* * Setup per-CPU ACPI IDs. */ static void madt_set_ids(void *dummy) { struct lapic_info *la; struct pcpu *pc; u_int i; if (madt == NULL) return; KASSERT(lapics != NULL, ("local APICs not initialized")); CPU_FOREACH(i) { pc = pcpu_find(i); KASSERT(pc != NULL, ("no pcpu data for CPU %u", i)); la = &lapics[pc->pc_apic_id]; if (!la->la_enabled) panic("APIC: CPU with APIC ID %u is not enabled", pc->pc_apic_id); pc->pc_acpi_id = la->la_acpi_id; if (bootverbose) printf("APIC: CPU %u has ACPI ID %u\n", i, la->la_acpi_id); } } SYSINIT(madt_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, madt_set_ids, NULL);