1261268Sjhb/*- 2261268Sjhb * Copyright (c) 2014 Advanced Computing Technologies LLC 3261268Sjhb * Written by: John H. Baldwin <jhb@FreeBSD.org> 4261268Sjhb * All rights reserved. 5261268Sjhb * 6261268Sjhb * Redistribution and use in source and binary forms, with or without 7261268Sjhb * modification, are permitted provided that the following conditions 8261268Sjhb * are met: 9261268Sjhb * 1. Redistributions of source code must retain the above copyright 10261268Sjhb * notice, this list of conditions and the following disclaimer. 11261268Sjhb * 2. Redistributions in binary form must reproduce the above copyright 12261268Sjhb * notice, this list of conditions and the following disclaimer in the 13261268Sjhb * documentation and/or other materials provided with the distribution. 14261268Sjhb * 15261268Sjhb * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16261268Sjhb * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17261268Sjhb * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18261268Sjhb * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19261268Sjhb * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20261268Sjhb * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21261268Sjhb * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22261268Sjhb * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23261268Sjhb * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24261268Sjhb * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25261268Sjhb * SUCH DAMAGE. 26261268Sjhb */ 27261268Sjhb 28261268Sjhb#include <sys/cdefs.h> 29261268Sjhb__FBSDID("$FreeBSD$"); 30261268Sjhb 31261268Sjhb#include <sys/types.h> 32261268Sjhb 33261268Sjhb#include <machine/vmm.h> 34261268Sjhb#include <vmmapi.h> 35261268Sjhb 36261268Sjhb#include "ioapic.h" 37261268Sjhb 38261268Sjhb/* 39261268Sjhb * Assign PCI INTx interrupts to I/O APIC pins in a round-robin 40261268Sjhb * fashion. Note that we have no idea what the HPET is using, but the 41261268Sjhb * HPET is also programmable whereas this is intended for hardwired 42261268Sjhb * PCI interrupts. 43261268Sjhb * 44261268Sjhb * This assumes a single I/O APIC where pins >= 16 are permitted for 45261268Sjhb * PCI devices. 46261268Sjhb */ 47261268Sjhbstatic int pci_pins; 48261268Sjhb 49261268Sjhbvoid 50261268Sjhbioapic_init(struct vmctx *ctx) 51261268Sjhb{ 52261268Sjhb 53261268Sjhb if (vm_ioapic_pincount(ctx, &pci_pins) < 0) { 54261268Sjhb pci_pins = 0; 55261268Sjhb return; 56261268Sjhb } 57261268Sjhb 58261268Sjhb /* Ignore the first 16 pins. */ 59261268Sjhb if (pci_pins <= 16) { 60261268Sjhb pci_pins = 0; 61261268Sjhb return; 62261268Sjhb } 63261268Sjhb pci_pins -= 16; 64261268Sjhb} 65261268Sjhb 66261268Sjhbint 67261268Sjhbioapic_pci_alloc_irq(void) 68261268Sjhb{ 69261268Sjhb static int last_pin; 70261268Sjhb 71261268Sjhb if (pci_pins == 0) 72261268Sjhb return (-1); 73261268Sjhb return (16 + (last_pin++ % pci_pins)); 74261268Sjhb} 75