/* * Copyright (c) 1996, by Steve Passe * 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. The name of the developer may NOT be used to endorse or promote products * derived from this software without specific prior written permission. * * 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. * * $FreeBSD: src/sys/i386/i386/mpapic.c,v 1.37.2.7 2003/01/25 02:31:47 peter Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define IOAPIC_COUNT_MAX 16 #define IOAPIC_ID_MASK (IOAPIC_COUNT_MAX - 1) struct ioapic_info { int io_idx; int io_apic_id; void *io_addr; int io_npin; int io_gsi_base; TAILQ_ENTRY(ioapic_info) io_link; }; TAILQ_HEAD(ioapic_info_list, ioapic_info); struct ioapic_intsrc { int int_gsi; enum intr_trigger int_trig; enum intr_polarity int_pola; }; struct ioapic_conf { struct ioapic_info_list ioc_list; struct ioapic_intsrc ioc_intsrc[ISA_IRQ_CNT]; }; static int ioapic_config(void); static void ioapic_setup(const struct ioapic_info *); static int ioapic_alloc_apic_id(int); static void ioapic_set_apic_id(const struct ioapic_info *); static void ioapic_gsi_setup(int); static const struct ioapic_info * ioapic_gsi_search(int); static void ioapic_pin_prog(void *, int, int, enum intr_trigger, enum intr_polarity, uint32_t, int); static struct ioapic_conf ioapic_conf; static TAILQ_HEAD(, ioapic_enumerator) ioapic_enumerators = TAILQ_HEAD_INITIALIZER(ioapic_enumerators); int ioapic_enable = -1; /* I/O APIC auto-enable mode */ static int ioapic_config(void) { struct ioapic_enumerator *e; struct ioapic_info *info; int start_apic_id = 0; int error, i, probe; register_t ef = 0; TAILQ_INIT(&ioapic_conf.ioc_list); for (i = 0; i < ISA_IRQ_CNT; ++i) ioapic_conf.ioc_intsrc[i].int_gsi = -1; probe = 1; TUNABLE_INT_FETCH("hw.ioapic_probe", &probe); if (!probe) { kprintf("IOAPIC: warning I/O APIC will not be probed\n"); return ENXIO; } TAILQ_FOREACH(e, &ioapic_enumerators, ioapic_link) { error = e->ioapic_probe(e); if (!error) break; } if (e == NULL) { kprintf("IOAPIC: can't find I/O APIC\n"); return ENXIO; } crit_enter(); ef = read_rflags(); cpu_disable_intr(); /* * Switch to I/O APIC MachIntrABI and reconfigure * the default IDT entries. */ MachIntrABI = MachIntrABI_IOAPIC; MachIntrABI.setdefault(); e->ioapic_enumerate(e); /* * Setup index */ i = 0; TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) info->io_idx = i++; if (i > IOAPIC_COUNT_MAX) panic("ioapic_config: more than 16 I/O APIC"); /* * Setup APIC ID */ TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { int apic_id; apic_id = ioapic_alloc_apic_id(start_apic_id); if (apic_id == NAPICID) { kprintf("IOAPIC: can't alloc APIC ID for " "%dth I/O APIC\n", info->io_idx); break; } info->io_apic_id = apic_id; start_apic_id = apic_id + 1; } if (info != NULL) { /* * xAPIC allows I/O APIC's APIC ID to be same * as the LAPIC's APIC ID */ kprintf("IOAPIC: use xAPIC model to alloc APIC ID " "for I/O APIC\n"); TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) info->io_apic_id = info->io_idx; } /* * Warning about any GSI holes */ TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { const struct ioapic_info *prev_info; prev_info = TAILQ_PREV(info, ioapic_info_list, io_link); if (prev_info != NULL) { if (info->io_gsi_base != prev_info->io_gsi_base + prev_info->io_npin) { kprintf("IOAPIC: warning gsi hole " "[%d, %d]\n", prev_info->io_gsi_base + prev_info->io_npin, info->io_gsi_base - 1); } } } if (bootverbose) { TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { kprintf("IOAPIC: idx %d, apic id %d, " "gsi base %d, npin %d\n", info->io_idx, info->io_apic_id, info->io_gsi_base, info->io_npin); } } /* * Setup all I/O APIC */ TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) ioapic_setup(info); ioapic_fixup_legacy_irqmaps(); write_rflags(ef); MachIntrABI.cleanup(); crit_exit(); return 0; } void ioapic_enumerator_register(struct ioapic_enumerator *ne) { struct ioapic_enumerator *e; TAILQ_FOREACH(e, &ioapic_enumerators, ioapic_link) { if (e->ioapic_prio < ne->ioapic_prio) { TAILQ_INSERT_BEFORE(e, ne, ioapic_link); return; } } TAILQ_INSERT_TAIL(&ioapic_enumerators, ne, ioapic_link); } void ioapic_add(void *addr, int gsi_base, int npin) { struct ioapic_info *info, *ninfo; int gsi_end; gsi_end = gsi_base + npin - 1; TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { if ((gsi_base >= info->io_gsi_base && gsi_base < info->io_gsi_base + info->io_npin) || (gsi_end >= info->io_gsi_base && gsi_end < info->io_gsi_base + info->io_npin)) { panic("ioapic_add: overlapped gsi, base %d npin %d, " "hit base %d, npin %d\n", gsi_base, npin, info->io_gsi_base, info->io_npin); } if (info->io_addr == addr) panic("ioapic_add: duplicated addr %p", addr); } ninfo = kmalloc(sizeof(*ninfo), M_DEVBUF, M_WAITOK | M_ZERO); ninfo->io_addr = addr; ninfo->io_npin = npin; ninfo->io_gsi_base = gsi_base; ninfo->io_apic_id = -1; /* * Create IOAPIC list in ascending order of GSI base */ TAILQ_FOREACH_REVERSE(info, &ioapic_conf.ioc_list, ioapic_info_list, io_link) { if (ninfo->io_gsi_base > info->io_gsi_base) { TAILQ_INSERT_AFTER(&ioapic_conf.ioc_list, info, ninfo, io_link); break; } } if (info == NULL) TAILQ_INSERT_HEAD(&ioapic_conf.ioc_list, ninfo, io_link); } void ioapic_intsrc(int irq, int gsi, enum intr_trigger trig, enum intr_polarity pola) { struct ioapic_intsrc *int_src; KKASSERT(irq < ISA_IRQ_CNT); int_src = &ioapic_conf.ioc_intsrc[irq]; if (gsi == 0) { /* Don't allow mixed mode */ kprintf("IOAPIC: warning intsrc irq %d -> gsi 0\n", irq); return; } if (int_src->int_gsi != -1) { if (int_src->int_gsi != gsi) { kprintf("IOAPIC: warning intsrc irq %d, gsi " "%d -> %d\n", irq, int_src->int_gsi, gsi); } if (int_src->int_trig != trig) { kprintf("IOAPIC: warning intsrc irq %d, trig " "%s -> %s\n", irq, intr_str_trigger(int_src->int_trig), intr_str_trigger(trig)); } if (int_src->int_pola != pola) { kprintf("IOAPIC: warning intsrc irq %d, pola " "%s -> %s\n", irq, intr_str_polarity(int_src->int_pola), intr_str_polarity(pola)); } } int_src->int_gsi = gsi; int_src->int_trig = trig; int_src->int_pola = pola; } static void ioapic_set_apic_id(const struct ioapic_info *info) { uint32_t id; int apic_id; id = ioapic_read(info->io_addr, IOAPIC_ID); id &= ~APIC_ID_MASK; id |= (info->io_apic_id << 24); ioapic_write(info->io_addr, IOAPIC_ID, id); /* * Re-read && test */ id = ioapic_read(info->io_addr, IOAPIC_ID); apic_id = (id & APIC_ID_MASK) >> 24; /* * I/O APIC ID is a 4bits field */ if ((apic_id & IOAPIC_ID_MASK) != (info->io_apic_id & IOAPIC_ID_MASK)) { panic("ioapic_set_apic_id: can't set apic id to %d, " "currently set to %d\n", info->io_apic_id, apic_id); } } static void ioapic_gsi_setup(int gsi) { enum intr_trigger trig; enum intr_polarity pola; int irq; if (gsi == 0) { /* ExtINT */ imen_lock(); ioapic_extpin_setup(ioapic_gsi_ioaddr(gsi), ioapic_gsi_pin(gsi), 0); imen_unlock(); return; } trig = 0; /* silence older gcc's */ pola = 0; /* silence older gcc's */ for (irq = 0; irq < ISA_IRQ_CNT; ++irq) { const struct ioapic_intsrc *int_src = &ioapic_conf.ioc_intsrc[irq]; if (gsi == int_src->int_gsi) { trig = int_src->int_trig; pola = int_src->int_pola; break; } } if (irq == ISA_IRQ_CNT) { /* * No explicit IRQ to GSI mapping; * use the default 1:1 mapping */ irq = gsi; if (irq < ISA_IRQ_CNT) { if (ioapic_conf.ioc_intsrc[irq].int_gsi >= 0) { /* * This IRQ is mapped to different GSI, * don't do the default configuration. * The configuration of the target GSI * will finally setup this IRQ. * * This GSI is not used, disable it. */ imen_lock(); ioapic_pin_setup(ioapic_gsi_ioaddr(gsi), ioapic_gsi_pin(gsi), 0, INTR_TRIGGER_EDGE, INTR_POLARITY_HIGH, 0); imen_unlock(); return; } trig = INTR_TRIGGER_EDGE; pola = INTR_POLARITY_HIGH; } else { trig = INTR_TRIGGER_LEVEL; pola = INTR_POLARITY_LOW; } } ioapic_set_legacy_irqmap(irq, gsi, trig, pola); } void * ioapic_gsi_ioaddr(int gsi) { const struct ioapic_info *info; info = ioapic_gsi_search(gsi); return info->io_addr; } int ioapic_gsi_pin(int gsi) { const struct ioapic_info *info; info = ioapic_gsi_search(gsi); return gsi - info->io_gsi_base; } static const struct ioapic_info * ioapic_gsi_search(int gsi) { const struct ioapic_info *info; TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { if (gsi >= info->io_gsi_base && gsi < info->io_gsi_base + info->io_npin) return info; } panic("ioapic_gsi_search: no I/O APIC"); } int ioapic_gsi(int idx, int pin) { const struct ioapic_info *info; TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { if (info->io_idx == idx) break; } if (info == NULL) return -1; if (pin >= info->io_npin) return -1; return info->io_gsi_base + pin; } void ioapic_extpin_setup(void *addr, int pin, int vec) { ioapic_pin_prog(addr, pin, vec, INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM, IOART_DELEXINT, 0); } int ioapic_extpin_gsi(void) { return 0; } void ioapic_pin_setup(void *addr, int pin, int vec, enum intr_trigger trig, enum intr_polarity pola, int cpuid) { /* * Always clear an I/O APIC pin before [re]programming it. This is * particularly important if the pin is set up for a level interrupt * as the IOART_REM_IRR bit might be set. When we reprogram the * vector any EOI from pending ints on this pin could be lost and * IRR might never get reset. * * To fix this problem, clear the vector and make sure it is * programmed as an edge interrupt. This should theoretically * clear IRR so we can later, safely program it as a level * interrupt. */ ioapic_pin_prog(addr, pin, vec, INTR_TRIGGER_EDGE, INTR_POLARITY_HIGH, IOART_DELFIXED, cpuid); ioapic_pin_prog(addr, pin, vec, trig, pola, IOART_DELFIXED, cpuid); } static void ioapic_pin_prog(void *addr, int pin, int vec, enum intr_trigger trig, enum intr_polarity pola, uint32_t del_mode, int cpuid) { uint32_t flags, target; int select; KKASSERT(del_mode == IOART_DELEXINT || del_mode == IOART_DELFIXED); select = IOAPIC_REDTBL0 + (2 * pin); flags = ioapic_read(addr, select) & IOART_RESV; flags |= IOART_INTMSET | IOART_DESTPHY; #ifdef foo flags |= del_mode; #else /* * We only support limited I/O APIC mixed mode, * so even for ExtINT, we still use "fixed" * delivery mode. */ flags |= IOART_DELFIXED; #endif if (del_mode == IOART_DELEXINT) { KKASSERT(trig == INTR_TRIGGER_CONFORM && pola == INTR_POLARITY_CONFORM); flags |= IOART_TRGREDG | IOART_INTAHI; } else { switch (trig) { case INTR_TRIGGER_EDGE: flags |= IOART_TRGREDG; break; case INTR_TRIGGER_LEVEL: flags |= IOART_TRGRLVL; break; case INTR_TRIGGER_CONFORM: panic("ioapic_pin_prog: trig conform is not " "supported\n"); } switch (pola) { case INTR_POLARITY_HIGH: flags |= IOART_INTAHI; break; case INTR_POLARITY_LOW: flags |= IOART_INTALO; break; case INTR_POLARITY_CONFORM: panic("ioapic_pin_prog: pola conform is not " "supported\n"); } } target = ioapic_read(addr, select + 1) & IOART_HI_DEST_RESV; target |= (CPUID_TO_APICID(cpuid) << IOART_HI_DEST_SHIFT) & IOART_HI_DEST_MASK; ioapic_write(addr, select, flags | vec); ioapic_write(addr, select + 1, target); } static void ioapic_setup(const struct ioapic_info *info) { int i; ioapic_set_apic_id(info); for (i = 0; i < info->io_npin; ++i) ioapic_gsi_setup(info->io_gsi_base + i); } static int ioapic_alloc_apic_id(int start) { for (;;) { const struct ioapic_info *info; int apic_id, apic_id16; apic_id = lapic_unused_apic_id(start); if (apic_id == NAPICID) { kprintf("IOAPIC: can't find unused APIC ID\n"); return apic_id; } apic_id16 = apic_id & IOAPIC_ID_MASK; /* * Check against other I/O APIC's APIC ID's lower 4bits. * * The new APIC ID will have to be different from others * in the lower 4bits, no matter whether xAPIC is used * or not. */ TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { if (info->io_apic_id == -1) { info = NULL; break; } if ((info->io_apic_id & IOAPIC_ID_MASK) == apic_id16) break; } if (info == NULL) return apic_id; kprintf("IOAPIC: APIC ID %d has same lower 4bits as " "%dth I/O APIC, keep searching...\n", apic_id, info->io_idx); start = apic_id + 1; } panic("ioapic_unused_apic_id: never reached"); } /* * Map a physical memory address representing I/O into KVA. The I/O * block is assumed not to cross a page boundary. */ void * ioapic_map(vm_paddr_t pa) { KKASSERT(pa < 0x100000000LL); return pmap_mapdev_uncacheable(pa, PAGE_SIZE); } static void ioapic_sysinit(void *dummy __unused) { int error; if (!ioapic_enable) return; KASSERT(lapic_enable, ("I/O APIC is enabled, but LAPIC is disabled")); error = ioapic_config(); if (error) { ioapic_enable = 0; icu_reinit_noioapic(); lapic_fixup_noioapic(); } } SYSINIT(ioapic, SI_BOOT2_IOAPIC, SI_ORDER_FIRST, ioapic_sysinit, NULL);