420 lines
9.0 KiB
C
420 lines
9.0 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <hypervisor.h>
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#define IOAPIC_MAX_PIN 240U
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#define IOAPIC_INVALID_PIN 0xffU
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struct gsi_table gsi_table[NR_MAX_GSI];
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uint32_t nr_gsi;
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static spinlock_t ioapic_lock;
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static union ioapic_rte saved_rte[NR_IOAPICS][IOAPIC_MAX_PIN];
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/*
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* the irq to ioapic pin mapping should extract from ACPI MADT table
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* hardcoded here
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*/
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static uint8_t legacy_irq_to_pin[NR_LEGACY_IRQ] = {
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2U, /* IRQ0*/
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1U, /* IRQ1*/
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0U, /* IRQ2 connected to Pin0 (ExtInt source of PIC) if existing */
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3U, /* IRQ3*/
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4U, /* IRQ4*/
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5U, /* IRQ5*/
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6U, /* IRQ6*/
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7U, /* IRQ7*/
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8U, /* IRQ8*/
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9U, /* IRQ9*/
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10U, /* IRQ10*/
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11U, /* IRQ11*/
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12U, /* IRQ12*/
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13U, /* IRQ13*/
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14U, /* IRQ14*/
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15U, /* IRQ15*/
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};
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static uint64_t legacy_irq_trigger_mode[NR_LEGACY_IRQ] = {
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IOAPIC_RTE_TRGREDG, /* IRQ0*/
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IOAPIC_RTE_TRGREDG, /* IRQ1*/
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IOAPIC_RTE_TRGREDG, /* IRQ2*/
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IOAPIC_RTE_TRGREDG, /* IRQ3*/
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IOAPIC_RTE_TRGREDG, /* IRQ4*/
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IOAPIC_RTE_TRGREDG, /* IRQ5*/
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IOAPIC_RTE_TRGREDG, /* IRQ6*/
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IOAPIC_RTE_TRGREDG, /* IRQ7*/
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IOAPIC_RTE_TRGREDG, /* IRQ8*/
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IOAPIC_RTE_TRGRLVL, /* IRQ9*/
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IOAPIC_RTE_TRGREDG, /* IRQ10*/
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IOAPIC_RTE_TRGREDG, /* IRQ11*/
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IOAPIC_RTE_TRGREDG, /* IRQ12*/
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IOAPIC_RTE_TRGREDG, /* IRQ13*/
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IOAPIC_RTE_TRGREDG, /* IRQ14*/
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IOAPIC_RTE_TRGREDG, /* IRQ15*/
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};
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uint8_t pic_ioapic_pin_map[NR_LEGACY_PIN] = {
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2U, /* pin0*/
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1U, /* pin1*/
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0U, /* pin2*/
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3U, /* pin3*/
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4U, /* pin4*/
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5U, /* pin5*/
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6U, /* pin6*/
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7U, /* pin7*/
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8U, /* pin8*/
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9U, /* pin9*/
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10U, /* pin10*/
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11U, /* pin11*/
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12U, /* pin12*/
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13U, /* pin13*/
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14U, /* pin14*/
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15U, /* pin15*/
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};
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static void *map_ioapic(uint64_t ioapic_paddr)
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{
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/* At some point we may need to translate this paddr to a vaddr.
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* 1:1 mapping for now.
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*/
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return hpa2hva(ioapic_paddr);
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}
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static inline uint32_t
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ioapic_read_reg32(void *ioapic_base, const uint32_t offset)
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{
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uint32_t v;
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uint64_t rflags;
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spinlock_irqsave_obtain(&ioapic_lock, &rflags);
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/* Write IOREGSEL */
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mmio_write32(offset, ioapic_base + IOAPIC_REGSEL);
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/* Read IOWIN */
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v = mmio_read32(ioapic_base + IOAPIC_WINDOW);
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spinlock_irqrestore_release(&ioapic_lock, rflags);
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return v;
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}
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static inline void
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ioapic_write_reg32(void *ioapic_base, const uint32_t offset, const uint32_t value)
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{
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uint64_t rflags;
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spinlock_irqsave_obtain(&ioapic_lock, &rflags);
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/* Write IOREGSEL */
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mmio_write32(offset, ioapic_base + IOAPIC_REGSEL);
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/* Write IOWIN */
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mmio_write32(value, ioapic_base + IOAPIC_WINDOW);
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spinlock_irqrestore_release(&ioapic_lock, rflags);
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}
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/**
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* @pre apic_id < 2
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*/
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static inline uint64_t
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get_ioapic_base(uint8_t apic_id)
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{
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const uint64_t addr[2] = {IOAPIC0_BASE, IOAPIC1_BASE};
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/* the ioapic base should be extracted from ACPI MADT table */
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return addr[apic_id];
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}
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void ioapic_get_rte_entry(void *ioapic_addr, uint8_t pin, union ioapic_rte *rte)
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{
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uint32_t rte_addr = ((uint32_t)pin * 2U) + 0x10U;
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rte->u.lo_32 = ioapic_read_reg32(ioapic_addr, rte_addr);
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rte->u.hi_32 = ioapic_read_reg32(ioapic_addr, rte_addr + 1U);
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}
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static inline void
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ioapic_set_rte_entry(void *ioapic_addr,
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uint8_t pin, union ioapic_rte rte)
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{
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uint32_t rte_addr = ((uint32_t)pin * 2U) + 0x10U;
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ioapic_write_reg32(ioapic_addr, rte_addr, rte.u.lo_32);
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ioapic_write_reg32(ioapic_addr, rte_addr + 1U, rte.u.hi_32);
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}
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static inline union ioapic_rte
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create_rte_for_legacy_irq(uint32_t irq, uint32_t vr)
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{
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union ioapic_rte rte;
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/* Legacy IRQ 0-15 setup, default masked
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* are actually defined in either MPTable or ACPI MADT table
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* before we have ACPI table parsing in HV we use common hardcode
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*/
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rte.full = IOAPIC_RTE_INTMSET;
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rte.full |= legacy_irq_trigger_mode[irq];
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rte.full |= DEFAULT_DEST_MODE;
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rte.full |= DEFAULT_DELIVERY_MODE;
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rte.full |= (IOAPIC_RTE_INTVEC & (uint64_t)vr);
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/* Fixed to active high */
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rte.full |= IOAPIC_RTE_INTAHI;
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/* Dest field: legacy irq fixed to CPU0 */
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rte.full |= (1UL << IOAPIC_RTE_DEST_SHIFT);
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return rte;
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}
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static inline union ioapic_rte
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create_rte_for_gsi_irq(uint32_t irq, uint32_t vr)
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{
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union ioapic_rte rte;
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if (irq < NR_LEGACY_IRQ) {
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rte = create_rte_for_legacy_irq(irq, vr);
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} else {
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/* irq default masked, level trig */
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rte.full = IOAPIC_RTE_INTMSET;
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rte.full |= IOAPIC_RTE_TRGRLVL;
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rte.full |= DEFAULT_DEST_MODE;
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rte.full |= DEFAULT_DELIVERY_MODE;
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rte.full |= (IOAPIC_RTE_INTVEC & (uint64_t)vr);
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/* Fixed to active high */
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rte.full |= IOAPIC_RTE_INTAHI;
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/* Dest field */
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rte.full |= (ALL_CPUS_MASK << IOAPIC_RTE_DEST_SHIFT);
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}
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return rte;
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}
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static void ioapic_set_routing(uint32_t gsi, uint32_t vr)
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{
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void *addr;
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union ioapic_rte rte;
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addr = gsi_table[gsi].addr;
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rte = create_rte_for_gsi_irq(gsi, vr);
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ioapic_set_rte_entry(addr, gsi_table[gsi].pin, rte);
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if ((rte.full & IOAPIC_RTE_TRGRMOD) != 0UL) {
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set_irq_trigger_mode(gsi, true);
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} else {
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set_irq_trigger_mode(gsi, false);
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}
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dev_dbg(ACRN_DBG_IRQ, "GSI: irq:%d pin:%hhu rte:%lx",
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gsi, gsi_table[gsi].pin,
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rte.full);
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}
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/**
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* @pre rte != NULL
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*/
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void ioapic_get_rte(uint32_t irq, union ioapic_rte *rte)
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{
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void *addr;
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if (irq_is_gsi(irq)) {
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addr = gsi_table[irq].addr;
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ioapic_get_rte_entry(addr, gsi_table[irq].pin, rte);
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}
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}
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void ioapic_set_rte(uint32_t irq, union ioapic_rte rte)
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{
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void *addr;
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if (irq_is_gsi(irq)) {
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addr = gsi_table[irq].addr;
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ioapic_set_rte_entry(addr, gsi_table[irq].pin, rte);
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dev_dbg(ACRN_DBG_IRQ, "GSI: irq:%d pin:%hhu rte:%lx",
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irq, gsi_table[irq].pin,
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rte.full);
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}
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}
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bool irq_is_gsi(uint32_t irq)
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{
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return irq < nr_gsi;
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}
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uint8_t irq_to_pin(uint32_t irq)
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{
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uint8_t ret;
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if (irq_is_gsi(irq)) {
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ret = gsi_table[irq].pin;
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} else {
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ret = IOAPIC_INVALID_PIN;
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}
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return ret;
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}
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uint32_t pin_to_irq(uint8_t pin)
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{
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uint32_t i;
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for (i = 0U; i < nr_gsi; i++) {
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if (gsi_table[i].pin == pin) {
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return i;
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}
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}
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return IRQ_INVALID;
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}
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static void
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irq_gsi_mask_unmask(uint32_t irq, bool mask)
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{
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void *addr;
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uint8_t pin;
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union ioapic_rte rte;
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if (irq_is_gsi(irq)) {
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addr = gsi_table[irq].addr;
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pin = gsi_table[irq].pin;
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ioapic_get_rte_entry(addr, pin, &rte);
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if (mask) {
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rte.full |= IOAPIC_RTE_INTMSET;
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} else {
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rte.full &= ~IOAPIC_RTE_INTMASK;
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}
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ioapic_set_rte_entry(addr, pin, rte);
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dev_dbg(ACRN_DBG_PTIRQ, "update: irq:%d pin:%hhu rte:%lx",
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irq, pin, rte.full);
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}
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}
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void gsi_mask_irq(uint32_t irq)
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{
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irq_gsi_mask_unmask(irq, true);
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}
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void gsi_unmask_irq(uint32_t irq)
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{
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irq_gsi_mask_unmask(irq, false);
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}
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static uint8_t
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ioapic_nr_pins(void *ioapic_base)
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{
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uint32_t version;
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uint8_t nr_pins;
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version = ioapic_read_reg32(ioapic_base, IOAPIC_VER);
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dev_dbg(ACRN_DBG_IRQ, "IOAPIC version: %x", version);
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/* The 23:16 bits in the version register is the highest entry in the
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* I/O redirection table, which is 1 smaller than the number of
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* interrupt input pins. */
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nr_pins = (uint8_t)
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(((version & IOAPIC_MAX_RTE_MASK) >> MAX_RTE_SHIFT) + 1U);
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ASSERT(nr_pins > NR_LEGACY_IRQ, "Legacy IRQ num > total GSI");
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ASSERT(nr_pins <= IOAPIC_MAX_PIN, "IOAPIC pins exceeding 240");
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return nr_pins;
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}
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void setup_ioapic_irqs(void)
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{
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uint8_t ioapic_id;
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uint32_t gsi = 0U;
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uint32_t vr;
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spinlock_init(&ioapic_lock);
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for (ioapic_id = 0U;
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ioapic_id < NR_IOAPICS; ioapic_id++) {
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void *addr;
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uint8_t pin, nr_pins;
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addr = map_ioapic(get_ioapic_base(ioapic_id));
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hv_access_memory_region_update((uint64_t)addr, PAGE_SIZE);
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nr_pins = ioapic_nr_pins(addr);
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for (pin = 0U; pin < nr_pins; pin++) {
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gsi_table[gsi].ioapic_id = ioapic_id;
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gsi_table[gsi].addr = addr;
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if (gsi < NR_LEGACY_IRQ) {
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gsi_table[gsi].pin =
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legacy_irq_to_pin[gsi] & 0xffU;
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} else {
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gsi_table[gsi].pin = pin;
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}
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/* pinned irq before use it */
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if (alloc_irq_num(gsi) == IRQ_INVALID) {
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pr_err("failed to alloc IRQ[%d]", gsi);
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gsi++;
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continue;
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}
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/* assign vector for this GSI
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* for legacy irq, reserved vector and never free
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*/
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if (gsi < NR_LEGACY_IRQ) {
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vr = alloc_irq_vector(gsi);
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if (vr == VECTOR_INVALID) {
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pr_err("failed to alloc VR");
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gsi++;
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continue;
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}
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} else {
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vr = 0U; /* not to allocate VR right now */
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}
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ioapic_set_routing(gsi, vr);
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gsi++;
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}
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}
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/* system max gsi numbers */
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nr_gsi = gsi;
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ASSERT(nr_gsi <= NR_MAX_GSI, "GSI table overflow");
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}
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void suspend_ioapic(void)
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{
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uint8_t ioapic_id, ioapic_pin;
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for (ioapic_id = 0U; ioapic_id < NR_IOAPICS; ioapic_id++) {
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void *addr;
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uint8_t nr_pins;
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addr = map_ioapic(get_ioapic_base(ioapic_id));
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nr_pins = ioapic_nr_pins(addr);
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for (ioapic_pin = 0U; ioapic_pin < nr_pins; ioapic_pin++) {
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ioapic_get_rte_entry(addr, ioapic_pin,
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&saved_rte[ioapic_id][ioapic_pin]);
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}
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}
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}
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void resume_ioapic(void)
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{
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uint8_t ioapic_id, ioapic_pin;
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for (ioapic_id = 0U; ioapic_id < NR_IOAPICS; ioapic_id++) {
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void *addr;
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uint8_t nr_pins;
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addr = map_ioapic(get_ioapic_base(ioapic_id));
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nr_pins = ioapic_nr_pins(addr);
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for (ioapic_pin = 0U; ioapic_pin < nr_pins; ioapic_pin++) {
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ioapic_set_rte_entry(addr, ioapic_pin,
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saved_rte[ioapic_id][ioapic_pin]);
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}
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}
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}
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