6a24f34e5c
Add trace events to the PCH watchdog timer, it can be useful to see how the guest is using it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1507816448-86665-1-git-send-email-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
272 lines
7.7 KiB
C
272 lines
7.7 KiB
C
/*
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* QEMU ICH9 TCO emulation
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*
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* Copyright (c) 2015 Paulo Alcantara <pcacjr@zytor.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "sysemu/watchdog.h"
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#include "hw/i386/ich9.h"
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#include "hw/acpi/tco.h"
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#include "trace.h"
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//#define DEBUG
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#ifdef DEBUG
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#define TCO_DEBUG(fmt, ...) \
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do { \
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fprintf(stderr, "%s "fmt, __func__, ## __VA_ARGS__); \
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} while (0)
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#else
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#define TCO_DEBUG(fmt, ...) do { } while (0)
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#endif
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enum {
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TCO_RLD_DEFAULT = 0x0000,
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TCO_DAT_IN_DEFAULT = 0x00,
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TCO_DAT_OUT_DEFAULT = 0x00,
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TCO1_STS_DEFAULT = 0x0000,
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TCO2_STS_DEFAULT = 0x0000,
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TCO1_CNT_DEFAULT = 0x0000,
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TCO2_CNT_DEFAULT = 0x0008,
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TCO_MESSAGE1_DEFAULT = 0x00,
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TCO_MESSAGE2_DEFAULT = 0x00,
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TCO_WDCNT_DEFAULT = 0x00,
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TCO_TMR_DEFAULT = 0x0004,
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SW_IRQ_GEN_DEFAULT = 0x03,
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};
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static inline void tco_timer_reload(TCOIORegs *tr)
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{
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int ticks = tr->tco.tmr & TCO_TMR_MASK;
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int64_t nsec = (int64_t)ticks * TCO_TICK_NSEC;
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trace_tco_timer_reload(ticks, nsec / 1000000);
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tr->expire_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + nsec;
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timer_mod(tr->tco_timer, tr->expire_time);
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}
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static inline void tco_timer_stop(TCOIORegs *tr)
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{
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tr->expire_time = -1;
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timer_del(tr->tco_timer);
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}
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static void tco_timer_expired(void *opaque)
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{
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TCOIORegs *tr = opaque;
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ICH9LPCPMRegs *pm = container_of(tr, ICH9LPCPMRegs, tco_regs);
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ICH9LPCState *lpc = container_of(pm, ICH9LPCState, pm);
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uint32_t gcs = pci_get_long(lpc->chip_config + ICH9_CC_GCS);
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trace_tco_timer_expired(tr->timeouts_no,
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lpc->pin_strap.spkr_hi,
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!!(gcs & ICH9_CC_GCS_NO_REBOOT));
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tr->tco.rld = 0;
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tr->tco.sts1 |= TCO_TIMEOUT;
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if (++tr->timeouts_no == 2) {
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tr->tco.sts2 |= TCO_SECOND_TO_STS;
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tr->tco.sts2 |= TCO_BOOT_STS;
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tr->timeouts_no = 0;
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if (!lpc->pin_strap.spkr_hi && !(gcs & ICH9_CC_GCS_NO_REBOOT)) {
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watchdog_perform_action();
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tco_timer_stop(tr);
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return;
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}
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}
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if (pm->smi_en & ICH9_PMIO_SMI_EN_TCO_EN) {
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ich9_generate_smi();
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}
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tr->tco.rld = tr->tco.tmr;
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tco_timer_reload(tr);
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}
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/* NOTE: values of 0 or 1 will be ignored by ICH */
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static inline int can_start_tco_timer(TCOIORegs *tr)
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{
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return !(tr->tco.cnt1 & TCO_TMR_HLT) && tr->tco.tmr > 1;
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}
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static uint32_t tco_ioport_readw(TCOIORegs *tr, uint32_t addr)
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{
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uint16_t rld;
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switch (addr) {
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case TCO_RLD:
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if (tr->expire_time != -1) {
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int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
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int64_t elapsed = (tr->expire_time - now) / TCO_TICK_NSEC;
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rld = (uint16_t)elapsed | (tr->tco.rld & ~TCO_RLD_MASK);
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} else {
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rld = tr->tco.rld;
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}
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return rld;
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case TCO_DAT_IN:
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return tr->tco.din;
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case TCO_DAT_OUT:
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return tr->tco.dout;
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case TCO1_STS:
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return tr->tco.sts1;
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case TCO2_STS:
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return tr->tco.sts2;
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case TCO1_CNT:
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return tr->tco.cnt1;
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case TCO2_CNT:
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return tr->tco.cnt2;
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case TCO_MESSAGE1:
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return tr->tco.msg1;
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case TCO_MESSAGE2:
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return tr->tco.msg2;
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case TCO_WDCNT:
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return tr->tco.wdcnt;
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case TCO_TMR:
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return tr->tco.tmr;
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case SW_IRQ_GEN:
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return tr->sw_irq_gen;
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}
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return 0;
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}
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static void tco_ioport_writew(TCOIORegs *tr, uint32_t addr, uint32_t val)
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{
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switch (addr) {
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case TCO_RLD:
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tr->timeouts_no = 0;
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if (can_start_tco_timer(tr)) {
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tr->tco.rld = tr->tco.tmr;
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tco_timer_reload(tr);
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} else {
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tr->tco.rld = val;
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}
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break;
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case TCO_DAT_IN:
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tr->tco.din = val;
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tr->tco.sts1 |= SW_TCO_SMI;
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ich9_generate_smi();
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break;
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case TCO_DAT_OUT:
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tr->tco.dout = val;
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tr->tco.sts1 |= TCO_INT_STS;
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/* TODO: cause an interrupt, as selected by the TCO_INT_SEL bits */
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break;
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case TCO1_STS:
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tr->tco.sts1 = val & TCO1_STS_MASK;
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break;
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case TCO2_STS:
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tr->tco.sts2 = val & TCO2_STS_MASK;
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break;
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case TCO1_CNT:
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val &= TCO1_CNT_MASK;
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/*
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* once TCO_LOCK bit is set, it can not be cleared by software. a reset
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* is required to change this bit from 1 to 0 -- it defaults to 0.
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*/
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tr->tco.cnt1 = val | (tr->tco.cnt1 & TCO_LOCK);
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if (can_start_tco_timer(tr)) {
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tr->tco.rld = tr->tco.tmr;
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tco_timer_reload(tr);
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} else {
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tco_timer_stop(tr);
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}
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break;
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case TCO2_CNT:
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tr->tco.cnt2 = val;
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break;
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case TCO_MESSAGE1:
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tr->tco.msg1 = val;
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break;
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case TCO_MESSAGE2:
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tr->tco.msg2 = val;
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break;
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case TCO_WDCNT:
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tr->tco.wdcnt = val;
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break;
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case TCO_TMR:
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tr->tco.tmr = val;
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break;
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case SW_IRQ_GEN:
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tr->sw_irq_gen = val;
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break;
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}
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}
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static uint64_t tco_io_readw(void *opaque, hwaddr addr, unsigned width)
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{
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TCOIORegs *tr = opaque;
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return tco_ioport_readw(tr, addr);
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}
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static void tco_io_writew(void *opaque, hwaddr addr, uint64_t val,
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unsigned width)
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{
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TCOIORegs *tr = opaque;
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tco_ioport_writew(tr, addr, val);
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}
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static const MemoryRegionOps tco_io_ops = {
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.read = tco_io_readw,
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.write = tco_io_writew,
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.valid.min_access_size = 1,
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.valid.max_access_size = 4,
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.impl.min_access_size = 1,
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.impl.max_access_size = 2,
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.endianness = DEVICE_LITTLE_ENDIAN,
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};
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void acpi_pm_tco_init(TCOIORegs *tr, MemoryRegion *parent)
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{
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*tr = (TCOIORegs) {
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.tco = {
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.rld = TCO_RLD_DEFAULT,
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.din = TCO_DAT_IN_DEFAULT,
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.dout = TCO_DAT_OUT_DEFAULT,
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.sts1 = TCO1_STS_DEFAULT,
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.sts2 = TCO2_STS_DEFAULT,
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.cnt1 = TCO1_CNT_DEFAULT,
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.cnt2 = TCO2_CNT_DEFAULT,
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.msg1 = TCO_MESSAGE1_DEFAULT,
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.msg2 = TCO_MESSAGE2_DEFAULT,
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.wdcnt = TCO_WDCNT_DEFAULT,
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.tmr = TCO_TMR_DEFAULT,
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},
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.sw_irq_gen = SW_IRQ_GEN_DEFAULT,
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.tco_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, tco_timer_expired, tr),
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.expire_time = -1,
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.timeouts_no = 0,
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};
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memory_region_init_io(&tr->io, memory_region_owner(parent),
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&tco_io_ops, tr, "sm-tco", ICH9_PMIO_TCO_LEN);
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memory_region_add_subregion(parent, ICH9_PMIO_TCO_RLD, &tr->io);
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}
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const VMStateDescription vmstate_tco_io_sts = {
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.name = "tco io device status",
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.version_id = 1,
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.minimum_version_id = 1,
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.minimum_version_id_old = 1,
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.fields = (VMStateField[]) {
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VMSTATE_UINT16(tco.rld, TCOIORegs),
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VMSTATE_UINT8(tco.din, TCOIORegs),
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VMSTATE_UINT8(tco.dout, TCOIORegs),
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VMSTATE_UINT16(tco.sts1, TCOIORegs),
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VMSTATE_UINT16(tco.sts2, TCOIORegs),
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VMSTATE_UINT16(tco.cnt1, TCOIORegs),
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VMSTATE_UINT16(tco.cnt2, TCOIORegs),
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VMSTATE_UINT8(tco.msg1, TCOIORegs),
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VMSTATE_UINT8(tco.msg2, TCOIORegs),
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VMSTATE_UINT8(tco.wdcnt, TCOIORegs),
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VMSTATE_UINT16(tco.tmr, TCOIORegs),
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VMSTATE_UINT8(sw_irq_gen, TCOIORegs),
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VMSTATE_TIMER_PTR(tco_timer, TCOIORegs),
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VMSTATE_INT64(expire_time, TCOIORegs),
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VMSTATE_UINT8(timeouts_no, TCOIORegs),
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VMSTATE_END_OF_LIST()
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}
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};
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