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acrn-hypervisor/hypervisor/dm/vioapic.c

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/*-
* Copyright (c) 2013 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
* Copyright (c) 2013 Neel Natu <neel@freebsd.org>
* Copyright (c) 2017-2022 Intel Corporation.
*
* 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 NETAPP, INC ``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 NETAPP, INC 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.
*
* $FreeBSD$
*/
#define pr_prefix "vioapic: "
#include <asm/guest/vm.h>
#include <errno.h>
#include <asm/irq.h>
#include <asm/guest/ept.h>
#include <asm/guest/assign.h>
#include <logmsg.h>
#include <asm/ioapic.h>
#define RTBL_RO_BITS ((uint32_t)0x00004000U | (uint32_t)0x00001000U) /*Remote IRR and Delivery Status bits*/
#define DBG_LEVEL_VIOAPIC 6U
#define ACRN_IOAPIC_VERSION 0x11U
#define MASK_ALL_INTERRUPTS 0x0001000000010000UL
static inline struct acrn_vioapics *vm_ioapics(const struct acrn_vm *vm)
{
return (struct acrn_vioapics *)&(vm->arch_vm.vioapics);
}
/**
* @pre pin < vioapic->chipinfo.nr_pins
*/
static void
vioapic_generate_intr(struct acrn_single_vioapic *vioapic, uint32_t pin)
{
uint32_t vector, dest, delmode;
union ioapic_rte rte;
bool level, phys;
rte = vioapic->rtbl[pin];
if (rte.bits.intr_mask == IOAPIC_RTE_MASK_SET) {
dev_dbg(DBG_LEVEL_VIOAPIC, "ioapic pin%hhu: masked", pin);
} else {
phys = (rte.bits.dest_mode == IOAPIC_RTE_DESTMODE_PHY);
delmode = rte.bits.delivery_mode;
level = (rte.bits.trigger_mode == IOAPIC_RTE_TRGRMODE_LEVEL);
/* For level trigger irq, avoid send intr if
* previous one hasn't received EOI
*/
if (!level || (vioapic->rtbl[pin].bits.remote_irr == 0UL)) {
if (level) {
vioapic->rtbl[pin].bits.remote_irr = IOAPIC_RTE_REM_IRR;
}
vector = rte.bits.vector;
dest = rte.bits.dest_field;
vlapic_receive_intr(vioapic->vm, level, dest, phys, delmode, vector, false);
}
}
}
/**
* @pre pin < vioapic->chipinfo.nr_pins
*/
static void
vioapic_set_pinstate(struct acrn_single_vioapic *vioapic, uint32_t pin, uint32_t level)
{
uint32_t old_lvl;
union ioapic_rte rte;
if (pin < vioapic->chipinfo.nr_pins) {
rte = vioapic->rtbl[pin];
old_lvl = (uint32_t)bitmap_test((uint16_t)(pin & 0x3FU), &vioapic->pin_state[pin >> 6U]);
if (level == 0U) {
/* clear pin_state and deliver interrupt according to polarity */
bitmap_clear_nolock((uint16_t)(pin & 0x3FU), &vioapic->pin_state[pin >> 6U]);
if ((rte.bits.intr_polarity == IOAPIC_RTE_INTPOL_ALO)
&& (old_lvl != level)) {
vioapic_generate_intr(vioapic, pin);
}
} else {
/* set pin_state and deliver intrrupt according to polarity */
bitmap_set_nolock((uint16_t)(pin & 0x3FU), &vioapic->pin_state[pin >> 6U]);
if ((rte.bits.intr_polarity == IOAPIC_RTE_INTPOL_AHI)
&& (old_lvl != level)) {
vioapic_generate_intr(vioapic, pin);
}
}
}
}
struct acrn_single_vioapic *
vgsi_to_vioapic_and_vpin(const struct acrn_vm *vm, uint32_t vgsi, uint32_t *vpin)
{
struct acrn_single_vioapic *vioapic;
uint8_t vioapic_index = 0U;
if (is_service_vm(vm)) {
/*
* Utilize platform ioapic_info for Service VM
*/
vioapic_index = get_gsi_to_ioapic_index(vgsi);
if (vpin != NULL) {
*vpin = gsi_to_ioapic_pin(vgsi);
}
} else {
if (vpin != NULL) {
*vpin = vgsi;
}
}
vioapic = (struct acrn_single_vioapic *)&(vm->arch_vm.vioapics.vioapic_array[vioapic_index]);
return vioapic;
}
/**
* @brief Set vIOAPIC IRQ line status.
*
* Similar with vioapic_set_irqline_lock(),but would not make sure
* operation be done with ioapic lock.
*
* @param[in] vm Pointer to target VM
* @param[in] vgsi Target GSI number
* @param[in] operation Action options: GSI_SET_HIGH/GSI_SET_LOW/
* GSI_RAISING_PULSE/GSI_FALLING_PULSE
*
* @pre vgsi < get_vm_gsicount(vm)
* @pre vm != NULL
* @return None
*/
void
vioapic_set_irqline_nolock(const struct acrn_vm *vm, uint32_t vgsi, uint32_t operation)
{
struct acrn_single_vioapic *vioapic;
uint32_t pin;
vioapic = vgsi_to_vioapic_and_vpin(vm, vgsi, &pin);
switch (operation) {
case GSI_SET_HIGH:
vioapic_set_pinstate(vioapic, pin, 1U);
break;
case GSI_SET_LOW:
vioapic_set_pinstate(vioapic, pin, 0U);
break;
case GSI_RAISING_PULSE:
vioapic_set_pinstate(vioapic, pin, 1U);
vioapic_set_pinstate(vioapic, pin, 0U);
break;
case GSI_FALLING_PULSE:
vioapic_set_pinstate(vioapic, pin, 0U);
vioapic_set_pinstate(vioapic, pin, 1U);
break;
default:
/*
* The function caller could guarantee the pre condition.
*/
break;
}
}
/**
* @brief Set vIOAPIC IRQ line status.
*
* @param[in] vm Pointer to target VM
* @param[in] vgsi Target GSI number
* @param[in] operation Action options: GSI_SET_HIGH/GSI_SET_LOW/
* GSI_RAISING_PULSE/GSI_FALLING_PULSE
*
* @pre vgsi < get_vm_gsicount(vm)
* @pre vm != NULL
*/
void
vioapic_set_irqline_lock(const struct acrn_vm *vm, uint32_t vgsi, uint32_t operation)
{
uint64_t rflags;
struct acrn_single_vioapic *vioapic;
vioapic = vgsi_to_vioapic_and_vpin(vm, vgsi, NULL);
spinlock_irqsave_obtain(&(vioapic->lock), &rflags);
vioapic_set_irqline_nolock(vm, vgsi, operation);
spinlock_irqrestore_release(&(vioapic->lock), rflags);
}
static uint32_t
vioapic_indirect_read(struct acrn_single_vioapic *vioapic, uint32_t addr)
{
uint32_t regnum, ret = 0U;
uint32_t pin, pincount = vioapic->chipinfo.nr_pins;
regnum = addr & 0xffU;
switch (regnum) {
case IOAPIC_ID:
ret = (uint32_t)vioapic->chipinfo.id << IOAPIC_ID_SHIFT;
break;
case IOAPIC_VER:
ret = ((pincount - 1U) << MAX_RTE_SHIFT) | ACRN_IOAPIC_VERSION;
break;
case IOAPIC_ARB:
ret = (uint32_t)vioapic->chipinfo.id << IOAPIC_ID_SHIFT;
break;
default:
/*
* In this switch statement, regnum shall either be IOAPIC_ID or
* IOAPIC_VER or IOAPIC_ARB.
* All the other cases will be handled properly later after this
* switch statement.
*/
break;
}
/* redirection table entries */
if ((regnum >= IOAPIC_REDTBL) &&
(regnum < (IOAPIC_REDTBL + (pincount * 2U)))) {
uint32_t addr_offset = regnum - IOAPIC_REDTBL;
uint32_t rte_offset = addr_offset >> 1U;
pin = rte_offset;
if ((addr_offset & 0x1U) != 0U) {
ret = vioapic->rtbl[pin].u.hi_32;
} else {
if (is_lapic_pt_configured(vioapic->vm) && (vioapic->rtbl[pin].bits.trigger_mode != 0UL)) {
/*
* For local APIC passthrough case, EOI would not trigger VM-exit. So virtual
* 'Remote IRR' would not be updated. Needs to read physical IOxAPIC RTE to
* update virtual 'Remote IRR' field each time when guest wants to read I/O
* REDIRECTION TABLE REGISTERS
*/
struct ptirq_remapping_info *entry = NULL;
union ioapic_rte phys_rte = {};
DEFINE_INTX_SID(virt_sid, vioapic->rtbl[pin].bits.vector, INTX_CTLR_IOAPIC);
entry = find_ptirq_entry(PTDEV_INTR_INTX, &virt_sid, vioapic->vm);
if (entry != NULL) {
ioapic_get_rte(entry->allocated_pirq, &phys_rte);
vioapic->rtbl[pin].bits.remote_irr = phys_rte.bits.remote_irr;
}
}
ret = vioapic->rtbl[pin].u.lo_32;
}
}
return ret;
}
static inline bool vioapic_need_intr(const struct acrn_single_vioapic *vioapic, uint16_t pin)
{
uint32_t lvl;
union ioapic_rte rte;
bool ret = false;
if ((uint32_t)pin < vioapic->chipinfo.nr_pins) {
rte = vioapic->rtbl[pin];
lvl = (uint32_t)bitmap_test(pin & 0x3FU, &vioapic->pin_state[pin >> 6U]);
ret = !!(((rte.bits.intr_polarity == IOAPIC_RTE_INTPOL_ALO) && (lvl == 0U)) ||
((rte.bits.intr_polarity == IOAPIC_RTE_INTPOL_AHI) && (lvl != 0U)));
}
return ret;
}
/*
* Due to the race between vcpus and vioapic->lock could be accessed from softirq, ensure to do
* spinlock_irqsave_obtain(&(vioapic->lock), &rflags) & spinlock_irqrestore_release(&(vioapic->lock), rflags)
* by caller.
*/
static void vioapic_indirect_write(struct acrn_single_vioapic *vioapic, uint32_t addr, uint32_t data)
{
union ioapic_rte last, new, changed;
uint32_t regnum;
uint32_t pin, pincount = vioapic->chipinfo.nr_pins;
regnum = addr & 0xffUL;
switch (regnum) {
case IOAPIC_ID:
vioapic->chipinfo.id = (uint8_t)((data & IOAPIC_ID_MASK) >> IOAPIC_ID_SHIFT);
break;
case IOAPIC_VER:
case IOAPIC_ARB:
/* readonly */
break;
default:
/*
* In this switch statement, regnum shall either be IOAPIC_ID or
* IOAPIC_VER or IOAPIC_ARB.
* All the other cases will be handled properly later after this
* switch statement.
*/
break;
}
/* redirection table entries */
if ((regnum >= IOAPIC_REDTBL) && (regnum < (IOAPIC_REDTBL + (pincount * 2U)))) {
bool wire_mode_valid = true;
uint32_t addr_offset = regnum - IOAPIC_REDTBL;
uint32_t rte_offset = addr_offset >> 1U;
pin = rte_offset;
last = vioapic->rtbl[pin];
new = last;
if ((addr_offset & 1U) != 0U) {
new.u.hi_32 = data;
} else {
new.u.lo_32 &= RTBL_RO_BITS;
new.u.lo_32 |= (data & ~RTBL_RO_BITS);
}
/* In some special scenarios, the LAPIC somehow hasn't send
* EOI to IOAPIC which cause the Remote IRR bit can't be clear.
* To clear it, some OSes will use EOI Register to clear it for
* 0x20 version IOAPIC, otherwise use switch Trigger Mode to
* Edge Sensitive to clear it.
*/
if (new.bits.trigger_mode == IOAPIC_RTE_TRGRMODE_EDGE) {
new.bits.remote_irr = 0U;
}
changed.full = last.full ^ new.full;
/* pin0 from vpic mask/unmask */
if ((pin == 0U) && (changed.bits.intr_mask != 0UL)) {
/* mask -> umask */
if (last.bits.intr_mask == IOAPIC_RTE_MASK_SET) {
if ((vioapic->vm->wire_mode == VPIC_WIRE_NULL) ||
(vioapic->vm->wire_mode == VPIC_WIRE_INTR)) {
vioapic->vm->wire_mode = VPIC_WIRE_IOAPIC;
dev_dbg(DBG_LEVEL_VIOAPIC, "vpic wire mode -> IOAPIC");
} else {
pr_err("WARNING: invalid vpic wire mode change");
wire_mode_valid = false;
}
/* unmask -> mask */
} else {
if (vioapic->vm->wire_mode == VPIC_WIRE_IOAPIC) {
vioapic->vm->wire_mode = VPIC_WIRE_INTR;
dev_dbg(DBG_LEVEL_VIOAPIC, "vpic wire mode -> INTR");
}
}
}
if (wire_mode_valid) {
vioapic->rtbl[pin] = new;
dev_dbg(DBG_LEVEL_VIOAPIC, "ioapic pin%hhu: redir table entry %#lx",
pin, vioapic->rtbl[pin].full);
/* remap for ptdev */
if ((new.bits.intr_mask == IOAPIC_RTE_MASK_CLR) || (last.bits.intr_mask == IOAPIC_RTE_MASK_CLR)) {
/* VM enable intr */
/* NOTE: only support max 256 pin */
(void)ptirq_intx_pin_remap(vioapic->vm, vioapic->chipinfo.gsi_base + pin, INTX_CTLR_IOAPIC);
}
/*
* Generate an interrupt if the following conditions are met:
* - pin is not masked
* - previous interrupt has been EOIed
* - pin level is asserted
*/
if ((vioapic->rtbl[pin].bits.intr_mask == IOAPIC_RTE_MASK_CLR) &&
(vioapic->rtbl[pin].bits.remote_irr == 0UL) &&
vioapic_need_intr(vioapic, (uint16_t)pin)) {
dev_dbg(DBG_LEVEL_VIOAPIC, "ioapic pin%hhu: asserted at rtbl write", pin);
vioapic_generate_intr(vioapic, pin);
}
}
}
}
static void
vioapic_mmio_rw(struct acrn_single_vioapic *vioapic, uint64_t gpa,
uint32_t *data, bool do_read)
{
uint32_t offset;
uint64_t rflags;
offset = (uint32_t)(gpa - vioapic->chipinfo.addr);
spinlock_irqsave_obtain(&(vioapic->lock), &rflags);
/* The IOAPIC specification allows 32-bit wide accesses to the
* IOAPIC_REGSEL (offset 0) and IOAPIC_WINDOW (offset 16) registers.
*/
switch (offset) {
case IOAPIC_REGSEL:
if (do_read) {
*data = vioapic->ioregsel;
} else {
vioapic->ioregsel = *data & 0xFFU;
}
break;
case IOAPIC_WINDOW:
if (do_read) {
*data = vioapic_indirect_read(vioapic,
vioapic->ioregsel);
} else {
vioapic_indirect_write(vioapic,
vioapic->ioregsel, *data);
}
break;
default:
if (do_read) {
*data = 0xFFFFFFFFU;
}
break;
}
spinlock_irqrestore_release(&(vioapic->lock), rflags);
}
/*
* @pre vm != NULL
*/
static void
vioapic_process_eoi(struct acrn_single_vioapic *vioapic, uint32_t vector)
{
uint32_t pin, pincount = vioapic->chipinfo.nr_pins;
union ioapic_rte rte;
uint64_t rflags;
if ((vector < VECTOR_DYNAMIC_START) || (vector > NR_MAX_VECTOR)) {
pr_err("vioapic_process_eoi: invalid vector %u", vector);
}
dev_dbg(DBG_LEVEL_VIOAPIC, "ioapic processing eoi for vector %u", vector);
/* notify device to ack if assigned pin */
for (pin = 0U; pin < pincount; pin++) {
rte = vioapic->rtbl[pin];
if ((rte.bits.vector != vector) ||
(rte.bits.remote_irr == 0U)) {
continue;
}
ptirq_intx_ack(vioapic->vm, vioapic->chipinfo.gsi_base + pin, INTX_CTLR_IOAPIC);
}
/*
* XXX keep track of the pins associated with this vector instead
* of iterating on every single pin each time.
*/
spinlock_irqsave_obtain(&(vioapic->lock), &rflags);
for (pin = 0U; pin < pincount; pin++) {
rte = vioapic->rtbl[pin];
if ((rte.bits.vector != vector) ||
(rte.bits.remote_irr == 0U)) {
continue;
}
vioapic->rtbl[pin].bits.remote_irr = 0U;
if (vioapic_need_intr(vioapic, (uint16_t)pin)) {
dev_dbg(DBG_LEVEL_VIOAPIC,
"ioapic pin%hhu: asserted at eoi", pin);
vioapic_generate_intr(vioapic, pin);
}
}
spinlock_irqrestore_release(&(vioapic->lock), rflags);
}
void vioapic_broadcast_eoi(const struct acrn_vm *vm, uint32_t vector)
{
struct acrn_single_vioapic *vioapic;
uint8_t vioapic_index;
/*
* For platforms with multiple IO-APICs, EOI message from LAPIC is
* broadcast to all IO-APICs. Emulating the same behavior here.
*/
for (vioapic_index = 0U; vioapic_index < vm->arch_vm.vioapics.ioapic_num; vioapic_index++) {
vioapic = &(vm_ioapics(vm)->vioapic_array[vioapic_index]);
vioapic_process_eoi(vioapic, vector);
}
}
static void reset_one_vioapic(struct acrn_single_vioapic *vioapic)
{
uint32_t pin, pincount;
/* Initialize all redirection entries to mask all interrupts */
pincount = vioapic->chipinfo.nr_pins;
for (pin = 0U; pin < pincount; pin++) {
vioapic->rtbl[pin].full = MASK_ALL_INTERRUPTS;
}
vioapic->chipinfo.id = 0U;
vioapic->ioregsel = 0U;
}
void reset_vioapics(const struct acrn_vm *vm)
{
struct acrn_vioapics *vioapics = vm_ioapics(vm);
uint8_t vioapic_index;
for (vioapic_index = 0U; vioapic_index < vioapics->ioapic_num; vioapic_index++) {
reset_one_vioapic(&vioapics->vioapic_array[vioapic_index]);
}
}
void
vioapic_init(struct acrn_vm *vm)
{
static struct ioapic_info virt_ioapic_info = {
.nr_pins = VIOAPIC_RTE_NUM,
.addr = VIOAPIC_BASE
};
struct ioapic_info *vioapic_info;
uint8_t vioapic_index;
struct acrn_single_vioapic *vioapic = NULL;
if (is_service_vm(vm)) {
vm->arch_vm.vioapics.ioapic_num = get_platform_ioapic_info(&vioapic_info);
} else {
vm->arch_vm.vioapics.ioapic_num = 1U;
vioapic_info = &virt_ioapic_info;
}
for (vioapic_index = 0U; vioapic_index < vm->arch_vm.vioapics.ioapic_num; vioapic_index++) {
vioapic = &vm->arch_vm.vioapics.vioapic_array[vioapic_index];
spinlock_init(&(vioapic->lock));
vioapic->chipinfo = vioapic_info[vioapic_index];
vioapic->vm = vm;
reset_one_vioapic(vioapic);
register_mmio_emulation_handler(vm, vioapic_mmio_access_handler, (uint64_t)vioapic->chipinfo.addr,
(uint64_t)vioapic->chipinfo.addr + VIOAPIC_SIZE, (void *)vioapic, false);
ept_del_mr(vm, (uint64_t *)vm->arch_vm.nworld_eptp, (uint64_t)vioapic->chipinfo.addr, VIOAPIC_SIZE);
}
/*
* Maximum number of GSI is computed as GSI base of the IOAPIC i.e. enumerated last in ACPI MADT
* plus the number of interrupt pins of that IOAPIC.
*/
if (vioapic != NULL) {
vm->arch_vm.vioapics.nr_gsi = vioapic->chipinfo.gsi_base + vioapic->chipinfo.nr_pins;
}
}
uint32_t
get_vm_gsicount(const struct acrn_vm *vm)
{
return vm->arch_vm.vioapics.nr_gsi;
}
/*
* @pre handler_private_data != NULL
*/
int32_t vioapic_mmio_access_handler(struct io_request *io_req, void *handler_private_data)
{
struct acrn_single_vioapic *vioapic = (struct acrn_single_vioapic *)handler_private_data;
struct acrn_mmio_request *mmio = &io_req->reqs.mmio_request;
uint64_t gpa = mmio->address;
int32_t ret = 0;
/* Note all RW to IOAPIC are 32-Bit in size */
if (mmio->size == 4UL) {
uint32_t data = (uint32_t)mmio->value;
if (mmio->direction == ACRN_IOREQ_DIR_READ) {
vioapic_mmio_rw(vioapic, gpa, &data, true);
mmio->value = (uint64_t)data;
} else if (mmio->direction == ACRN_IOREQ_DIR_WRITE) {
vioapic_mmio_rw(vioapic, gpa, &data, false);
} else {
ret = -EINVAL;
}
} else {
pr_err("All RW to IOAPIC must be 32-bits in size");
ret = -EINVAL;
}
return ret;
}
/**
* @pre vm->arch_vm.vioapics != NULL
* @pre vgsi < get_vm_gsicount(vm)
* @pre rte != NULL
*/
void vioapic_get_rte(const struct acrn_vm *vm, uint32_t vgsi, union ioapic_rte *rte)
{
struct acrn_single_vioapic *vioapic;
uint32_t pin;
vioapic = vgsi_to_vioapic_and_vpin(vm, vgsi, &pin);
*rte = vioapic->rtbl[pin];
}
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