From 7cbcc538f4b3040db1e39a6547efa501a8a44907 Mon Sep 17 00:00:00 2001 From: Atish Patra Date: Wed, 24 Aug 2022 15:13:55 -0700 Subject: [PATCH] hw/intc: Move mtimer/mtimecmp to aclint Historically, The mtime/mtimecmp has been part of the CPU because they are per hart entities. However, they actually belong to aclint which is a MMIO device. Move them to the ACLINT device. This also emulates the real hardware more closely. Reviewed-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Andrew Jones Signed-off-by: Atish Patra Message-Id: <20220824221357.41070-2-atishp@rivosinc.com> Signed-off-by: Alistair Francis --- hw/intc/riscv_aclint.c | 48 ++++++++++++++++++++++++---------- hw/timer/ibex_timer.c | 18 +++++-------- include/hw/intc/riscv_aclint.h | 2 ++ include/hw/timer/ibex_timer.h | 2 ++ target/riscv/cpu.h | 2 -- target/riscv/machine.c | 5 ++-- 6 files changed, 47 insertions(+), 30 deletions(-) diff --git a/hw/intc/riscv_aclint.c b/hw/intc/riscv_aclint.c index e7942c4e5a32..eee04643cb19 100644 --- a/hw/intc/riscv_aclint.c +++ b/hw/intc/riscv_aclint.c @@ -32,6 +32,7 @@ #include "hw/intc/riscv_aclint.h" #include "qemu/timer.h" #include "hw/irq.h" +#include "migration/vmstate.h" typedef struct riscv_aclint_mtimer_callback { RISCVAclintMTimerState *s; @@ -65,19 +66,22 @@ static void riscv_aclint_mtimer_write_timecmp(RISCVAclintMTimerState *mtimer, uint64_t rtc_r = cpu_riscv_read_rtc(mtimer); - cpu->env.timecmp = value; - if (cpu->env.timecmp <= rtc_r) { + /* Compute the relative hartid w.r.t the socket */ + hartid = hartid - mtimer->hartid_base; + + mtimer->timecmp[hartid] = value; + if (mtimer->timecmp[hartid] <= rtc_r) { /* * If we're setting an MTIMECMP value in the "past", * immediately raise the timer interrupt */ - qemu_irq_raise(mtimer->timer_irqs[hartid - mtimer->hartid_base]); + qemu_irq_raise(mtimer->timer_irqs[hartid]); return; } /* otherwise, set up the future timer interrupt */ - qemu_irq_lower(mtimer->timer_irqs[hartid - mtimer->hartid_base]); - diff = cpu->env.timecmp - rtc_r; + qemu_irq_lower(mtimer->timer_irqs[hartid]); + diff = mtimer->timecmp[hartid] - rtc_r; /* back to ns (note args switched in muldiv64) */ uint64_t ns_diff = muldiv64(diff, NANOSECONDS_PER_SECOND, timebase_freq); @@ -102,7 +106,7 @@ static void riscv_aclint_mtimer_write_timecmp(RISCVAclintMTimerState *mtimer, next = MIN(next, INT64_MAX); } - timer_mod(cpu->env.timer, next); + timer_mod(mtimer->timers[hartid], next); } /* @@ -133,11 +137,11 @@ static uint64_t riscv_aclint_mtimer_read(void *opaque, hwaddr addr, "aclint-mtimer: invalid hartid: %zu", hartid); } else if ((addr & 0x7) == 0) { /* timecmp_lo for RV32/RV64 or timecmp for RV64 */ - uint64_t timecmp = env->timecmp; + uint64_t timecmp = mtimer->timecmp[hartid]; return (size == 4) ? (timecmp & 0xFFFFFFFF) : timecmp; } else if ((addr & 0x7) == 4) { /* timecmp_hi */ - uint64_t timecmp = env->timecmp; + uint64_t timecmp = mtimer->timecmp[hartid]; return (timecmp >> 32) & 0xFFFFFFFF; } else { qemu_log_mask(LOG_UNIMP, @@ -177,7 +181,7 @@ static void riscv_aclint_mtimer_write(void *opaque, hwaddr addr, } else if ((addr & 0x7) == 0) { if (size == 4) { /* timecmp_lo for RV32/RV64 */ - uint64_t timecmp_hi = env->timecmp >> 32; + uint64_t timecmp_hi = mtimer->timecmp[hartid] >> 32; riscv_aclint_mtimer_write_timecmp(mtimer, RISCV_CPU(cpu), hartid, timecmp_hi << 32 | (value & 0xFFFFFFFF)); } else { @@ -188,7 +192,7 @@ static void riscv_aclint_mtimer_write(void *opaque, hwaddr addr, } else if ((addr & 0x7) == 4) { if (size == 4) { /* timecmp_hi for RV32/RV64 */ - uint64_t timecmp_lo = env->timecmp; + uint64_t timecmp_lo = mtimer->timecmp[hartid]; riscv_aclint_mtimer_write_timecmp(mtimer, RISCV_CPU(cpu), hartid, value << 32 | (timecmp_lo & 0xFFFFFFFF)); } else { @@ -234,7 +238,7 @@ static void riscv_aclint_mtimer_write(void *opaque, hwaddr addr, } riscv_aclint_mtimer_write_timecmp(mtimer, RISCV_CPU(cpu), mtimer->hartid_base + i, - env->timecmp); + mtimer->timecmp[i]); } return; } @@ -284,6 +288,8 @@ static void riscv_aclint_mtimer_realize(DeviceState *dev, Error **errp) s->timer_irqs = g_new(qemu_irq, s->num_harts); qdev_init_gpio_out(dev, s->timer_irqs, s->num_harts); + s->timers = g_new0(QEMUTimer *, s->num_harts); + s->timecmp = g_new0(uint64_t, s->num_harts); /* Claim timer interrupt bits */ for (i = 0; i < s->num_harts; i++) { RISCVCPU *cpu = RISCV_CPU(qemu_get_cpu(s->hartid_base + i)); @@ -310,6 +316,18 @@ static void riscv_aclint_mtimer_reset_enter(Object *obj, ResetType type) riscv_aclint_mtimer_write(mtimer, mtimer->time_base, 0, 8); } +static const VMStateDescription vmstate_riscv_mtimer = { + .name = "riscv_mtimer", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_VARRAY_UINT32(timecmp, RISCVAclintMTimerState, + num_harts, 0, + vmstate_info_uint64, uint64_t), + VMSTATE_END_OF_LIST() + } +}; + static void riscv_aclint_mtimer_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); @@ -317,6 +335,7 @@ static void riscv_aclint_mtimer_class_init(ObjectClass *klass, void *data) device_class_set_props(dc, riscv_aclint_mtimer_properties); ResettableClass *rc = RESETTABLE_CLASS(klass); rc->phases.enter = riscv_aclint_mtimer_reset_enter; + dc->vmsd = &vmstate_riscv_mtimer; } static const TypeInfo riscv_aclint_mtimer_info = { @@ -336,6 +355,7 @@ DeviceState *riscv_aclint_mtimer_create(hwaddr addr, hwaddr size, { int i; DeviceState *dev = qdev_new(TYPE_RISCV_ACLINT_MTIMER); + RISCVAclintMTimerState *s = RISCV_ACLINT_MTIMER(dev); assert(num_harts <= RISCV_ACLINT_MAX_HARTS); assert(!(addr & 0x7)); @@ -366,11 +386,11 @@ DeviceState *riscv_aclint_mtimer_create(hwaddr addr, hwaddr size, riscv_cpu_set_rdtime_fn(env, cpu_riscv_read_rtc, dev); } - cb->s = RISCV_ACLINT_MTIMER(dev); + cb->s = s; cb->num = i; - env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, + s->timers[i] = timer_new_ns(QEMU_CLOCK_VIRTUAL, &riscv_aclint_mtimer_cb, cb); - env->timecmp = 0; + s->timecmp[i] = 0; qdev_connect_gpio_out(dev, i, qdev_get_gpio_in(DEVICE(rvcpu), IRQ_M_TIMER)); diff --git a/hw/timer/ibex_timer.c b/hw/timer/ibex_timer.c index 8c2ca364daab..d8b8e4e1f602 100644 --- a/hw/timer/ibex_timer.c +++ b/hw/timer/ibex_timer.c @@ -60,8 +60,6 @@ static uint64_t cpu_riscv_read_rtc(uint32_t timebase_freq) static void ibex_timer_update_irqs(IbexTimerState *s) { - CPUState *cs = qemu_get_cpu(0); - RISCVCPU *cpu = RISCV_CPU(cs); uint64_t value = s->timer_compare_lower0 | ((uint64_t)s->timer_compare_upper0 << 32); uint64_t next, diff; @@ -73,9 +71,9 @@ static void ibex_timer_update_irqs(IbexTimerState *s) } /* Update the CPUs mtimecmp */ - cpu->env.timecmp = value; + s->mtimecmp = value; - if (cpu->env.timecmp <= now) { + if (s->mtimecmp <= now) { /* * If the mtimecmp was in the past raise the interrupt now. */ @@ -91,7 +89,7 @@ static void ibex_timer_update_irqs(IbexTimerState *s) qemu_irq_lower(s->m_timer_irq); qemu_set_irq(s->irq, false); - diff = cpu->env.timecmp - now; + diff = s->mtimecmp - now; next = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + muldiv64(diff, NANOSECONDS_PER_SECOND, @@ -99,9 +97,9 @@ static void ibex_timer_update_irqs(IbexTimerState *s) if (next < qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) { /* We overflowed the timer, just set it as large as we can */ - timer_mod(cpu->env.timer, 0x7FFFFFFFFFFFFFFF); + timer_mod(s->mtimer, 0x7FFFFFFFFFFFFFFF); } else { - timer_mod(cpu->env.timer, next); + timer_mod(s->mtimer, next); } } @@ -120,11 +118,9 @@ static void ibex_timer_reset(DeviceState *dev) { IbexTimerState *s = IBEX_TIMER(dev); - CPUState *cpu = qemu_get_cpu(0); - CPURISCVState *env = cpu->env_ptr; - env->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, + s->mtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &ibex_timer_cb, s); - env->timecmp = 0; + s->mtimecmp = 0; s->timer_ctrl = 0x00000000; s->timer_cfg0 = 0x00010000; diff --git a/include/hw/intc/riscv_aclint.h b/include/hw/intc/riscv_aclint.h index 26d4048687fb..693415eb6def 100644 --- a/include/hw/intc/riscv_aclint.h +++ b/include/hw/intc/riscv_aclint.h @@ -32,6 +32,8 @@ typedef struct RISCVAclintMTimerState { /*< private >*/ SysBusDevice parent_obj; uint64_t time_delta; + uint64_t *timecmp; + QEMUTimer **timers; /*< public >*/ MemoryRegion mmio; diff --git a/include/hw/timer/ibex_timer.h b/include/hw/timer/ibex_timer.h index 1a0a28d5fab5..41f5c82a920b 100644 --- a/include/hw/timer/ibex_timer.h +++ b/include/hw/timer/ibex_timer.h @@ -33,6 +33,8 @@ OBJECT_DECLARE_SIMPLE_TYPE(IbexTimerState, IBEX_TIMER) struct IbexTimerState { /* */ SysBusDevice parent_obj; + uint64_t mtimecmp; + QEMUTimer *mtimer; /* Internal timer for M-mode interrupt */ /* */ MemoryRegion mmio; diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index 081cd0554471..53335def2336 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -307,7 +307,6 @@ struct CPUArchState { /* temporary htif regs */ uint64_t mfromhost; uint64_t mtohost; - uint64_t timecmp; /* physical memory protection */ pmp_table_t pmp_state; @@ -362,7 +361,6 @@ struct CPUArchState { float_status fp_status; /* Fields from here on are preserved across CPU reset. */ - QEMUTimer *timer; /* Internal timer */ hwaddr kernel_addr; hwaddr fdt_addr; diff --git a/target/riscv/machine.c b/target/riscv/machine.c index dc182ca81119..b508b042cb73 100644 --- a/target/riscv/machine.c +++ b/target/riscv/machine.c @@ -307,8 +307,8 @@ static const VMStateDescription vmstate_pmu_ctr_state = { const VMStateDescription vmstate_riscv_cpu = { .name = "cpu", - .version_id = 3, - .minimum_version_id = 3, + .version_id = 4, + .minimum_version_id = 4, .post_load = riscv_cpu_post_load, .fields = (VMStateField[]) { VMSTATE_UINTTL_ARRAY(env.gpr, RISCVCPU, 32), @@ -359,7 +359,6 @@ const VMStateDescription vmstate_riscv_cpu = { VMSTATE_UINTTL(env.mscratch, RISCVCPU), VMSTATE_UINT64(env.mfromhost, RISCVCPU), VMSTATE_UINT64(env.mtohost, RISCVCPU), - VMSTATE_UINT64(env.timecmp, RISCVCPU), VMSTATE_END_OF_LIST() },