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charset="utf-8" Currently, TIME CSRs are emulated only for user-only mode. This patch add TIME CSRs emulation for privileged mode. For privileged mode, the TIME CSRs will return value provided by rdtime callback which is registered by QEMU machine/platform emulation (i.e. CLINT emulation). If rdtime callback is not available then the monitor (i.e. OpenSBI) will trap-n-emulate TIME CSRs in software. We see 25+% performance improvement in hackbench numbers when TIME CSRs are not trap-n-emulated. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis --- target/riscv/cpu.h | 5 +++ target/riscv/cpu_helper.c | 5 +++ target/riscv/csr.c | 86 +++++++++++++++++++++++++++++++++++++-- 3 files changed, 92 insertions(+), 4 deletions(-) diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index d52f209361..3dcdf92227 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -159,6 +159,7 @@ struct CPURISCVState { target_ulong htval; target_ulong htinst; target_ulong hgatp; + uint64_t htimedelta; =20 /* Virtual CSRs */ target_ulong vsstatus; @@ -201,6 +202,9 @@ struct CPURISCVState { /* physical memory protection */ pmp_table_t pmp_state; =20 + /* machine specific rdtime callback */ + uint64_t (*rdtime_fn)(void); + /* True if in debugger mode. */ bool debugger; #endif @@ -322,6 +326,7 @@ void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env); int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts); uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value= ); #define BOOL_TO_MASK(x) (-!!(x)) /* helper for riscv_cpu_update_mip value = */ +void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(void)); #endif void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv); =20 diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index b9e90dfd9a..cc9f20b471 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -258,6 +258,11 @@ uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t = mask, uint32_t value) return old; } =20 +void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(void)) +{ + env->rdtime_fn =3D fn; +} + void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv) { if (newpriv > PRV_M) { diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 572a478e8c..11d184cd16 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -238,6 +238,32 @@ static int read_timeh(CPURISCVState *env, int csrno, t= arget_ulong *val) =20 #else /* CONFIG_USER_ONLY */ =20 +static int read_time(CPURISCVState *env, int csrno, target_ulong *val) +{ + uint64_t delta =3D riscv_cpu_virt_enabled(env) ? env->htimedelta : 0; + + if (!env->rdtime_fn) { + return -1; + } + + *val =3D env->rdtime_fn() + delta; + return 0; +} + +#if defined(TARGET_RISCV32) +static int read_timeh(CPURISCVState *env, int csrno, target_ulong *val) +{ + uint64_t delta =3D riscv_cpu_virt_enabled(env) ? env->htimedelta : 0; + + if (!env->rdtime_fn) { + return -1; + } + + *val =3D (env->rdtime_fn() + delta) >> 32; + return 0; +} +#endif + /* Machine constants */ =20 #define M_MODE_INTERRUPTS (MIP_MSIP | MIP_MTIP | MIP_MEIP) @@ -930,6 +956,56 @@ static int write_hgatp(CPURISCVState *env, int csrno, = target_ulong val) return 0; } =20 +static int read_htimedelta(CPURISCVState *env, int csrno, target_ulong *va= l) +{ + if (!env->rdtime_fn) { + return -1; + } + +#if defined(TARGET_RISCV32) + *val =3D env->htimedelta & 0xffffffff; +#else + *val =3D env->htimedelta; +#endif + return 0; +} + +static int write_htimedelta(CPURISCVState *env, int csrno, target_ulong va= l) +{ + if (!env->rdtime_fn) { + return -1; + } + +#if defined(TARGET_RISCV32) + env->htimedelta =3D deposit64(env->htimedelta, 0, 32, (uint64_t)val); +#else + env->htimedelta =3D val; +#endif + return 0; +} + +#if defined(TARGET_RISCV32) +static int read_htimedeltah(CPURISCVState *env, int csrno, target_ulong *v= al) +{ + if (!env->rdtime_fn) { + return -1; + } + + *val =3D env->htimedelta >> 32; + return 0; +} + +static int write_htimedeltah(CPURISCVState *env, int csrno, target_ulong v= al) +{ + if (!env->rdtime_fn) { + return -1; + } + + env->htimedelta =3D deposit64(env->htimedelta, 32, 32, (uint64_t)val); + return 0; +} +#endif + /* Virtual CSR Registers */ static int read_vsstatus(CPURISCVState *env, int csrno, target_ulong *val) { @@ -1202,14 +1278,12 @@ static riscv_csr_operations csr_ops[CSR_TABLE_SIZE]= =3D { [CSR_INSTRETH] =3D { ctr, read_instreth = }, #endif =20 - /* User-level time CSRs are only available in linux-user - * In privileged mode, the monitor emulates these CSRs */ -#if defined(CONFIG_USER_ONLY) + /* In privileged mode, the monitor will have to emulate TIME CSRs only= if + * rdtime callback is not provided by machine/platform emulation */ [CSR_TIME] =3D { ctr, read_time = }, #if defined(TARGET_RISCV32) [CSR_TIMEH] =3D { ctr, read_timeh = }, #endif -#endif =20 #if !defined(CONFIG_USER_ONLY) /* Machine Timers and Counters */ @@ -1275,6 +1349,10 @@ static riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = =3D { [CSR_HTVAL] =3D { hmode, read_htval, write_htval= }, [CSR_HTINST] =3D { hmode, read_htinst, write_htins= t }, [CSR_HGATP] =3D { hmode, read_hgatp, write_hgatp= }, + [CSR_HTIMEDELTA] =3D { hmode, read_htimedelta, write_htime= delta }, +#if defined(TARGET_RISCV32) + [CSR_HTIMEDELTAH] =3D { hmode, read_htimedeltah, write_htime= deltah}, +#endif =20 [CSR_VSSTATUS] =3D { hmode, read_vsstatus, write_vssta= tus }, [CSR_VSIP] =3D { hmode, NULL, NULL, rmw_vsip = }, --=20 2.17.1 From nobody Sat May 18 21:26:36 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" This patch extends CLINT emulation to provide rdtime callback for TCG. This rdtime callback will be called wheneven TIME CSRs are read in privileged modes. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis --- hw/riscv/sifive_clint.c | 6 +++++- hw/riscv/sifive_e.c | 2 +- hw/riscv/sifive_u.c | 2 +- hw/riscv/spike.c | 9 ++++++--- hw/riscv/virt.c | 2 +- include/hw/riscv/sifive_clint.h | 3 ++- 6 files changed, 16 insertions(+), 8 deletions(-) diff --git a/hw/riscv/sifive_clint.c b/hw/riscv/sifive_clint.c index e2feee871b..e933d35092 100644 --- a/hw/riscv/sifive_clint.c +++ b/hw/riscv/sifive_clint.c @@ -227,7 +227,8 @@ type_init(sifive_clint_register_types) * Create CLINT device. */ DeviceState *sifive_clint_create(hwaddr addr, hwaddr size, uint32_t num_ha= rts, - uint32_t sip_base, uint32_t timecmp_base, uint32_t time_base) + uint32_t sip_base, uint32_t timecmp_base, uint32_t time_base, + bool provide_rdtime) { int i; for (i =3D 0; i < num_harts; i++) { @@ -236,6 +237,9 @@ DeviceState *sifive_clint_create(hwaddr addr, hwaddr si= ze, uint32_t num_harts, if (!env) { continue; } + if (provide_rdtime) { + riscv_cpu_set_rdtime_fn(env, cpu_riscv_read_rtc); + } env->timer =3D timer_new_ns(QEMU_CLOCK_VIRTUAL, &sifive_clint_timer_cb, cpu); env->timecmp =3D 0; diff --git a/hw/riscv/sifive_e.c b/hw/riscv/sifive_e.c index 8a6b0348df..a254cad489 100644 --- a/hw/riscv/sifive_e.c +++ b/hw/riscv/sifive_e.c @@ -164,7 +164,7 @@ static void riscv_sifive_e_soc_realize(DeviceState *dev= , Error **errp) memmap[SIFIVE_E_PLIC].size); sifive_clint_create(memmap[SIFIVE_E_CLINT].base, memmap[SIFIVE_E_CLINT].size, ms->smp.cpus, - SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE); + SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE, false); create_unimplemented_device("riscv.sifive.e.aon", memmap[SIFIVE_E_AON].base, memmap[SIFIVE_E_AON].size); sifive_e_prci_create(memmap[SIFIVE_E_PRCI].base); diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c index 0e12b3ccef..156a003642 100644 --- a/hw/riscv/sifive_u.c +++ b/hw/riscv/sifive_u.c @@ -549,7 +549,7 @@ static void riscv_sifive_u_soc_realize(DeviceState *dev= , Error **errp) serial_hd(1), qdev_get_gpio_in(DEVICE(s->plic), SIFIVE_U_UART1_IRQ= )); sifive_clint_create(memmap[SIFIVE_U_CLINT].base, memmap[SIFIVE_U_CLINT].size, ms->smp.cpus, - SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE); + SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE, false); =20 object_property_set_bool(OBJECT(&s->prci), true, "realized", &err); sysbus_mmio_map(SYS_BUS_DEVICE(&s->prci), 0, memmap[SIFIVE_U_PRCI].bas= e); diff --git a/hw/riscv/spike.c b/hw/riscv/spike.c index 8823681783..6e5723a171 100644 --- a/hw/riscv/spike.c +++ b/hw/riscv/spike.c @@ -227,7 +227,8 @@ static void spike_board_init(MachineState *machine) =20 /* Core Local Interruptor (timer and IPI) */ sifive_clint_create(memmap[SPIKE_CLINT].base, memmap[SPIKE_CLINT].size, - smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE); + smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE, + false); } =20 static void spike_v1_10_0_board_init(MachineState *machine) @@ -316,7 +317,8 @@ static void spike_v1_10_0_board_init(MachineState *mach= ine) =20 /* Core Local Interruptor (timer and IPI) */ sifive_clint_create(memmap[SPIKE_CLINT].base, memmap[SPIKE_CLINT].size, - smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE); + smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE, + false); } =20 static void spike_v1_09_1_board_init(MachineState *machine) @@ -424,7 +426,8 @@ static void spike_v1_09_1_board_init(MachineState *mach= ine) =20 /* Core Local Interruptor (timer and IPI) */ sifive_clint_create(memmap[SPIKE_CLINT].base, memmap[SPIKE_CLINT].size, - smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE); + smp_cpus, SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE, + false); =20 g_free(config_string); } diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c index c44b865959..50838019c8 100644 --- a/hw/riscv/virt.c +++ b/hw/riscv/virt.c @@ -562,7 +562,7 @@ static void riscv_virt_board_init(MachineState *machine) memmap[VIRT_PLIC].size); sifive_clint_create(memmap[VIRT_CLINT].base, memmap[VIRT_CLINT].size, smp_cpus, - SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE); + SIFIVE_SIP_BASE, SIFIVE_TIMECMP_BASE, SIFIVE_TIME_BASE, true); sifive_test_create(memmap[VIRT_TEST].base); =20 for (i =3D 0; i < VIRTIO_COUNT; i++) { diff --git a/include/hw/riscv/sifive_clint.h b/include/hw/riscv/sifive_clin= t.h index ae8286c884..4a720bfece 100644 --- a/include/hw/riscv/sifive_clint.h +++ b/include/hw/riscv/sifive_clint.h @@ -41,7 +41,8 @@ typedef struct SiFiveCLINTState { } SiFiveCLINTState; =20 DeviceState *sifive_clint_create(hwaddr addr, hwaddr size, uint32_t num_ha= rts, - uint32_t sip_base, uint32_t timecmp_base, uint32_t time_base); + uint32_t sip_base, uint32_t timecmp_base, uint32_t time_base, + bool provide_rdtime); =20 enum { SIFIVE_SIP_BASE =3D 0x0, --=20 2.17.1