/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include static int hpet_init_proxy(int *hpet_vect, iflag_t *hpet_flags); static boolean_t hpet_install_proxy(void); static boolean_t hpet_callback(int code); static boolean_t hpet_cpr(int code); static boolean_t hpet_resume(void); static void hpet_cst_callback(uint32_t code); static boolean_t hpet_deep_idle_config(int code); static int hpet_validate_table(ACPI_TABLE_HPET *hpet_table); static boolean_t hpet_checksum_table(unsigned char *table, unsigned int len); static void *hpet_memory_map(ACPI_TABLE_HPET *hpet_table); static int hpet_start_main_counter(hpet_info_t *hip); static int hpet_stop_main_counter(hpet_info_t *hip); static uint64_t hpet_read_main_counter_value(hpet_info_t *hip); static uint64_t hpet_set_leg_rt_cnf(hpet_info_t *hip, uint32_t new_value); static uint64_t hpet_read_gen_cap(hpet_info_t *hip); static uint64_t hpet_read_gen_config(hpet_info_t *hip); static uint64_t hpet_read_gen_intrpt_stat(hpet_info_t *hip); static uint64_t hpet_read_timer_N_config(hpet_info_t *hip, uint_t n); static hpet_TN_conf_cap_t hpet_convert_timer_N_config(uint64_t conf); static void hpet_write_gen_config(hpet_info_t *hip, uint64_t l); static void hpet_write_gen_intrpt_stat(hpet_info_t *hip, uint64_t l); static void hpet_write_timer_N_config(hpet_info_t *hip, uint_t n, uint64_t l); static void hpet_write_timer_N_comp(hpet_info_t *hip, uint_t n, uint64_t l); static void hpet_disable_timer(hpet_info_t *hip, uint32_t timer_n); static void hpet_enable_timer(hpet_info_t *hip, uint32_t timer_n); static int hpet_get_IOAPIC_intr_capable_timer(hpet_info_t *hip); static int hpet_timer_available(uint32_t allocated_timers, uint32_t n); static void hpet_timer_alloc(uint32_t *allocated_timers, uint32_t n); static void hpet_timer_set_up(hpet_info_t *hip, uint32_t timer_n, uint32_t interrupt); static uint_t hpet_isr(char *arg); static uint32_t hpet_install_interrupt_handler(uint_t (*func)(char *), int vector); static void hpet_uninstall_interrupt_handler(void); static void hpet_expire_all(void); static boolean_t hpet_guaranteed_schedule(hrtime_t required_wakeup_time); static boolean_t hpet_use_hpet_timer(hrtime_t *expire); static void hpet_use_lapic_timer(hrtime_t expire); static void hpet_init_proxy_data(void); /* * hpet_state_lock is used to synchronize disabling/enabling deep c-states * and to synchronize suspend/resume. */ static kmutex_t hpet_state_lock; static struct hpet_state { boolean_t proxy_installed; /* CBE proxy interrupt setup */ boolean_t cpr; /* currently in CPR */ boolean_t cpu_deep_idle; /* user enable/disable */ boolean_t uni_cstate; /* disable if only one cstate */ } hpet_state = { B_FALSE, B_FALSE, B_TRUE, B_TRUE}; uint64_t hpet_spin_check = HPET_SPIN_CHECK; uint64_t hpet_spin_timeout = HPET_SPIN_TIMEOUT; uint64_t hpet_idle_spin_timeout = HPET_SPIN_TIMEOUT; uint64_t hpet_isr_spin_timeout = HPET_SPIN_TIMEOUT; static kmutex_t hpet_proxy_lock; /* lock for lAPIC proxy data */ /* * hpet_proxy_users is a per-cpu array. */ static hpet_proxy_t *hpet_proxy_users; /* one per CPU */ ACPI_TABLE_HPET *hpet_table; /* ACPI HPET table */ hpet_info_t hpet_info; /* Human readable Information */ /* * Provide HPET access from unix.so. * Set up pointers to access symbols in pcplusmp. */ static void hpet_establish_hooks(void) { hpet.install_proxy = &hpet_install_proxy; hpet.callback = &hpet_callback; hpet.use_hpet_timer = &hpet_use_hpet_timer; hpet.use_lapic_timer = &hpet_use_lapic_timer; } /* * Get the ACPI "HPET" table. * acpi_probe() calls this function from mp_startup before drivers are loaded. * acpi_probe() verified the system is using ACPI before calling this. * * There may be more than one ACPI HPET table (Itanium only?). * Intel's HPET spec defines each timer block to have up to 32 counters and * be 1024 bytes long. There can be more than one timer block of 32 counters. * Each timer block would have an additional ACPI HPET table. * Typical x86 systems today only have 1 HPET with 3 counters. * On x86 we only consume HPET table "1" for now. */ int hpet_acpi_init(int *hpet_vect, iflag_t *hpet_flags) { extern hrtime_t tsc_read(void); extern int idle_cpu_no_deep_c; extern int cpuid_deep_cstates_supported(void); void *la; uint64_t ret; uint_t num_timers; uint_t ti; (void) memset(&hpet_info, 0, sizeof (hpet_info)); hpet.supported = HPET_NO_SUPPORT; if (idle_cpu_no_deep_c) return (DDI_FAILURE); if (!cpuid_deep_cstates_supported()) return (DDI_FAILURE); hpet_establish_hooks(); /* * Get HPET ACPI table 1. */ if (ACPI_FAILURE(AcpiGetTable(ACPI_SIG_HPET, HPET_TABLE_1, (ACPI_TABLE_HEADER **)&hpet_table))) { cmn_err(CE_NOTE, "!hpet_acpi: unable to get ACPI HPET table"); return (DDI_FAILURE); } if (hpet_validate_table(hpet_table) != AE_OK) { cmn_err(CE_NOTE, "!hpet_acpi: invalid HPET table"); return (DDI_FAILURE); } la = hpet_memory_map(hpet_table); if (la == NULL) { cmn_err(CE_NOTE, "!hpet_acpi: memory map HPET failed"); return (DDI_FAILURE); } hpet_info.logical_address = la; ret = hpet_read_gen_cap(&hpet_info); hpet_info.gen_cap.counter_clk_period = HPET_GCAP_CNTR_CLK_PERIOD(ret); hpet_info.gen_cap.vendor_id = HPET_GCAP_VENDOR_ID(ret); hpet_info.gen_cap.leg_route_cap = HPET_GCAP_LEG_ROUTE_CAP(ret); hpet_info.gen_cap.count_size_cap = HPET_GCAP_CNT_SIZE_CAP(ret); /* * Hardware contains the last timer's number. * Add 1 to get the number of timers. */ hpet_info.gen_cap.num_tim_cap = HPET_GCAP_NUM_TIM_CAP(ret) + 1; hpet_info.gen_cap.rev_id = HPET_GCAP_REV_ID(ret); if (hpet_info.gen_cap.counter_clk_period > HPET_MAX_CLK_PERIOD) { cmn_err(CE_NOTE, "!hpet_acpi: COUNTER_CLK_PERIOD 0x%lx > 0x%lx", (long)hpet_info.gen_cap.counter_clk_period, (long)HPET_MAX_CLK_PERIOD); return (DDI_FAILURE); } num_timers = (uint_t)hpet_info.gen_cap.num_tim_cap; if ((num_timers < 3) || (num_timers > 32)) { cmn_err(CE_NOTE, "!hpet_acpi: invalid number of HPET timers " "%lx", (long)num_timers); return (DDI_FAILURE); } hpet_info.timer_n_config = (hpet_TN_conf_cap_t *)kmem_zalloc( num_timers * sizeof (uint64_t), KM_SLEEP); ret = hpet_read_gen_config(&hpet_info); hpet_info.gen_config.leg_rt_cnf = HPET_GCFR_LEG_RT_CNF_BITX(ret); hpet_info.gen_config.enable_cnf = HPET_GCFR_ENABLE_CNF_BITX(ret); /* * Solaris does not use the HPET Legacy Replacement Route capabilities. * This feature has been off by default on test systems. * The HPET spec does not specify if Legacy Replacement Route is * on or off by default, so we explicitely set it off here. * It should not matter which mode the HPET is in since we use * the first available non-legacy replacement timer: timer 2. */ (void) hpet_set_leg_rt_cnf(&hpet_info, 0); ret = hpet_read_gen_config(&hpet_info); hpet_info.gen_config.leg_rt_cnf = HPET_GCFR_LEG_RT_CNF_BITX(ret); hpet_info.gen_config.enable_cnf = HPET_GCFR_ENABLE_CNF_BITX(ret); hpet_info.gen_intrpt_stat = hpet_read_gen_intrpt_stat(&hpet_info); hpet_info.main_counter_value = hpet_read_main_counter_value(&hpet_info); for (ti = 0; ti < num_timers; ++ti) { ret = hpet_read_timer_N_config(&hpet_info, ti); /* * Make sure no timers are enabled (think fast reboot or * virtual hardware). */ if (ret & HPET_TIMER_N_INT_ENB_CNF_BIT) { hpet_disable_timer(&hpet_info, ti); ret &= ~HPET_TIMER_N_INT_ENB_CNF_BIT; } hpet_info.timer_n_config[ti] = hpet_convert_timer_N_config(ret); } /* * Be aware the Main Counter may need to be initialized in the future * if it is used for more than just Deep C-State support. * The HPET's Main Counter does not need to be initialize to a specific * value before starting it for use to wake up CPUs from Deep C-States. */ if (hpet_start_main_counter(&hpet_info) != AE_OK) { cmn_err(CE_NOTE, "!hpet_acpi: hpet_start_main_counter failed"); return (DDI_FAILURE); } hpet_info.period = hpet_info.gen_cap.counter_clk_period; /* * Read main counter twice to record HPET latency for debugging. */ hpet_info.tsc[0] = tsc_read(); hpet_info.hpet_main_counter_reads[0] = hpet_read_main_counter_value(&hpet_info); hpet_info.tsc[1] = tsc_read(); hpet_info.hpet_main_counter_reads[1] = hpet_read_main_counter_value(&hpet_info); hpet_info.tsc[2] = tsc_read(); ret = hpet_read_gen_config(&hpet_info); hpet_info.gen_config.leg_rt_cnf = HPET_GCFR_LEG_RT_CNF_BITX(ret); hpet_info.gen_config.enable_cnf = HPET_GCFR_ENABLE_CNF_BITX(ret); /* * HPET main counter reads are supported now. */ hpet.supported = HPET_TIMER_SUPPORT; return (hpet_init_proxy(hpet_vect, hpet_flags)); } void hpet_acpi_fini(void) { if (hpet.supported == HPET_NO_SUPPORT) return; if (hpet.supported >= HPET_TIMER_SUPPORT) (void) hpet_stop_main_counter(&hpet_info); if (hpet.supported > HPET_TIMER_SUPPORT) hpet_disable_timer(&hpet_info, hpet_info.cstate_timer.timer); } /* * Do initial setup to use a HPET timer as a proxy for Deep C-state stalled * LAPIC Timers. Get a free HPET timer that supports I/O APIC routed interrupt. * Setup data to handle the timer's ISR, and add the timer's interrupt. * * The ddi cannot be use to allocate the HPET timer's interrupt. * ioapic_init_intr() in mp_platform_common() later sets up the I/O APIC * to handle the HPET timer's interrupt. * * Note: FSB (MSI) interrupts are not currently supported by Intel HPETs as of * ICH9. The HPET spec allows for MSI. In the future MSI may be prefered. */ static int hpet_init_proxy(int *hpet_vect, iflag_t *hpet_flags) { if (hpet_get_IOAPIC_intr_capable_timer(&hpet_info) == -1) { cmn_err(CE_WARN, "!hpet_acpi: get ioapic intr failed."); return (DDI_FAILURE); } hpet_init_proxy_data(); if (hpet_install_interrupt_handler(&hpet_isr, hpet_info.cstate_timer.intr) != AE_OK) { cmn_err(CE_WARN, "!hpet_acpi: install interrupt failed."); return (DDI_FAILURE); } *hpet_vect = hpet_info.cstate_timer.intr; hpet_flags->intr_el = INTR_EL_LEVEL; hpet_flags->intr_po = INTR_PO_ACTIVE_HIGH; hpet_flags->bustype = BUS_PCI; /* we *do* conform to PCI */ /* * Avoid a possibly stuck interrupt by programing the HPET's timer here * before the I/O APIC is programmed to handle this interrupt. */ hpet_timer_set_up(&hpet_info, hpet_info.cstate_timer.timer, hpet_info.cstate_timer.intr); /* * All HPET functionality is supported. */ hpet.supported = HPET_FULL_SUPPORT; return (DDI_SUCCESS); } /* * Called by kernel if it can support Deep C-States. */ static boolean_t hpet_install_proxy(void) { if (hpet_state.proxy_installed == B_TRUE) return (B_TRUE); if (hpet.supported != HPET_FULL_SUPPORT) return (B_FALSE); hpet_enable_timer(&hpet_info, hpet_info.cstate_timer.timer); hpet_state.proxy_installed = B_TRUE; return (B_TRUE); } /* * Remove the interrupt that was added with add_avintr() in * hpet_install_interrupt_handler(). */ static void hpet_uninstall_interrupt_handler(void) { rem_avintr(NULL, CBE_HIGH_PIL, (avfunc)&hpet_isr, hpet_info.cstate_timer.intr); } static int hpet_validate_table(ACPI_TABLE_HPET *hpet_table) { ACPI_TABLE_HEADER *table_header = (ACPI_TABLE_HEADER *)hpet_table; if (table_header->Length != sizeof (ACPI_TABLE_HPET)) { cmn_err(CE_WARN, "!hpet_validate_table: Length %lx != sizeof (" "ACPI_TABLE_HPET) %lx.", (unsigned long)((ACPI_TABLE_HEADER *)hpet_table)->Length, (unsigned long)sizeof (ACPI_TABLE_HPET)); return (AE_ERROR); } if (!ACPI_COMPARE_NAME(table_header->Signature, ACPI_SIG_HPET)) { cmn_err(CE_WARN, "!hpet_validate_table: Invalid HPET table " "signature"); return (AE_ERROR); } if (!hpet_checksum_table((unsigned char *)hpet_table, (unsigned int)table_header->Length)) { cmn_err(CE_WARN, "!hpet_validate_table: Invalid HPET checksum"); return (AE_ERROR); } /* * Sequence should be table number - 1. We are using table 1. */ if (hpet_table->Sequence != HPET_TABLE_1 - 1) { cmn_err(CE_WARN, "!hpet_validate_table: Invalid Sequence %lx", (long)hpet_table->Sequence); return (AE_ERROR); } return (AE_OK); } static boolean_t hpet_checksum_table(unsigned char *table, unsigned int length) { unsigned char checksum = 0; int i; for (i = 0; i < length; ++i, ++table) checksum += *table; return (checksum == 0); } static void * hpet_memory_map(ACPI_TABLE_HPET *hpet_table) { return (AcpiOsMapMemory(hpet_table->Address.Address, HPET_SIZE)); } static int hpet_start_main_counter(hpet_info_t *hip) { uint64_t *gcr_ptr; uint64_t gcr; gcr_ptr = (uint64_t *)HPET_GEN_CONFIG_ADDRESS(hip->logical_address); gcr = *gcr_ptr; gcr |= HPET_GCFR_ENABLE_CNF; *gcr_ptr = gcr; gcr = *gcr_ptr; return (gcr & HPET_GCFR_ENABLE_CNF ? AE_OK : ~AE_OK); } static int hpet_stop_main_counter(hpet_info_t *hip) { uint64_t *gcr_ptr; uint64_t gcr; gcr_ptr = (uint64_t *)HPET_GEN_CONFIG_ADDRESS(hip->logical_address); gcr = *gcr_ptr; gcr &= ~HPET_GCFR_ENABLE_CNF; *gcr_ptr = gcr; gcr = *gcr_ptr; return (gcr & HPET_GCFR_ENABLE_CNF ? ~AE_OK : AE_OK); } /* * Set the Legacy Replacement Route bit. * This should be called before setting up timers. * The HPET specification is silent regarding setting this after timers are * programmed. */ static uint64_t hpet_set_leg_rt_cnf(hpet_info_t *hip, uint32_t new_value) { uint64_t gen_conf = hpet_read_gen_config(hip); switch (new_value) { case 0: gen_conf &= ~HPET_GCFR_LEG_RT_CNF; break; case HPET_GCFR_LEG_RT_CNF: gen_conf |= HPET_GCFR_LEG_RT_CNF; break; default: ASSERT(new_value == 0 || new_value == HPET_GCFR_LEG_RT_CNF); break; } hpet_write_gen_config(hip, gen_conf); return (gen_conf); } static uint64_t hpet_read_gen_cap(hpet_info_t *hip) { return (*(uint64_t *)HPET_GEN_CAP_ADDRESS(hip->logical_address)); } static uint64_t hpet_read_gen_config(hpet_info_t *hip) { return (*(uint64_t *) HPET_GEN_CONFIG_ADDRESS(hip->logical_address)); } static uint64_t hpet_read_gen_intrpt_stat(hpet_info_t *hip) { hip->gen_intrpt_stat = *(uint64_t *)HPET_GEN_INTR_STAT_ADDRESS( hip->logical_address); return (hip->gen_intrpt_stat); } static uint64_t hpet_read_timer_N_config(hpet_info_t *hip, uint_t n) { uint64_t conf = *(uint64_t *)HPET_TIMER_N_CONF_ADDRESS( hip->logical_address, n); hip->timer_n_config[n] = hpet_convert_timer_N_config(conf); return (conf); } static hpet_TN_conf_cap_t hpet_convert_timer_N_config(uint64_t conf) { hpet_TN_conf_cap_t cc = { 0 }; cc.int_route_cap = HPET_TIMER_N_INT_ROUTE_CAP(conf); cc.fsb_int_del_cap = HPET_TIMER_N_FSB_INT_DEL_CAP(conf); cc.fsb_int_en_cnf = HPET_TIMER_N_FSB_EN_CNF(conf); cc.int_route_cnf = HPET_TIMER_N_INT_ROUTE_CNF(conf); cc.mode32_cnf = HPET_TIMER_N_MODE32_CNF(conf); cc.val_set_cnf = HPET_TIMER_N_VAL_SET_CNF(conf); cc.size_cap = HPET_TIMER_N_SIZE_CAP(conf); cc.per_int_cap = HPET_TIMER_N_PER_INT_CAP(conf); cc.type_cnf = HPET_TIMER_N_TYPE_CNF(conf); cc.int_enb_cnf = HPET_TIMER_N_INT_ENB_CNF(conf); cc.int_type_cnf = HPET_TIMER_N_INT_TYPE_CNF(conf); return (cc); } static uint64_t hpet_read_main_counter_value(hpet_info_t *hip) { uint64_t value; uint32_t *counter; uint32_t high1, high2, low; counter = (uint32_t *)HPET_MAIN_COUNTER_ADDRESS(hip->logical_address); /* * 32-bit main counters */ if (hip->gen_cap.count_size_cap == 0) { value = (uint64_t)*counter; hip->main_counter_value = value; return (value); } /* * HPET spec claims a 64-bit read can be split into two 32-bit reads * by the hardware connection to the HPET. */ high2 = counter[1]; do { high1 = high2; low = counter[0]; high2 = counter[1]; } while (high2 != high1); value = ((uint64_t)high1 << 32) | low; hip->main_counter_value = value; return (value); } static void hpet_write_gen_config(hpet_info_t *hip, uint64_t l) { *(uint64_t *)HPET_GEN_CONFIG_ADDRESS(hip->logical_address) = l; } static void hpet_write_gen_intrpt_stat(hpet_info_t *hip, uint64_t l) { *(uint64_t *)HPET_GEN_INTR_STAT_ADDRESS(hip->logical_address) = l; } static void hpet_write_timer_N_config(hpet_info_t *hip, uint_t n, uint64_t l) { if (hip->timer_n_config[n].size_cap == 1) *(uint64_t *)HPET_TIMER_N_CONF_ADDRESS( hip->logical_address, n) = l; else *(uint32_t *)HPET_TIMER_N_CONF_ADDRESS( hip->logical_address, n) = (uint32_t)(0xFFFFFFFF & l); } static void hpet_write_timer_N_comp(hpet_info_t *hip, uint_t n, uint64_t l) { *(uint64_t *)HPET_TIMER_N_COMP_ADDRESS(hip->logical_address, n) = l; } static void hpet_disable_timer(hpet_info_t *hip, uint32_t timer_n) { uint64_t l; l = hpet_read_timer_N_config(hip, timer_n); l &= ~HPET_TIMER_N_INT_ENB_CNF_BIT; hpet_write_timer_N_config(hip, timer_n, l); } static void hpet_enable_timer(hpet_info_t *hip, uint32_t timer_n) { uint64_t l; l = hpet_read_timer_N_config(hip, timer_n); l |= HPET_TIMER_N_INT_ENB_CNF_BIT; hpet_write_timer_N_config(hip, timer_n, l); } /* * Add the interrupt handler for I/O APIC interrupt number (interrupt line). * * The I/O APIC line (vector) is programmed in ioapic_init_intr() called * from apic_picinit() psm_ops apic_ops entry point after we return from * apic_init() psm_ops entry point. */ static uint32_t hpet_install_interrupt_handler(uint_t (*func)(char *), int vector) { uint32_t retval; retval = add_avintr(NULL, CBE_HIGH_PIL, (avfunc)func, "HPET Timer", vector, NULL, NULL, NULL, NULL); if (retval == 0) { cmn_err(CE_WARN, "!hpet_acpi: add_avintr() failed"); return (AE_BAD_PARAMETER); } return (AE_OK); } /* * The HPET timers specify which I/O APIC interrupts they can be routed to. * Find the first available non-legacy-replacement timer and its I/O APIC irq. * Supported I/O APIC IRQs are specified in the int_route_cap bitmap in each * timer's timer_n_config register. */ static int hpet_get_IOAPIC_intr_capable_timer(hpet_info_t *hip) { int timer; int intr; for (timer = HPET_FIRST_NON_LEGACY_TIMER; timer < hip->gen_cap.num_tim_cap; ++timer) { if (!hpet_timer_available(hip->allocated_timers, timer)) continue; intr = lowbit(hip->timer_n_config[timer].int_route_cap) - 1; if (intr >= 0) { hpet_timer_alloc(&hip->allocated_timers, timer); hip->cstate_timer.timer = timer; hip->cstate_timer.intr = intr; return (timer); } } return (-1); } /* * Mark this timer as used. */ static void hpet_timer_alloc(uint32_t *allocated_timers, uint32_t n) { *allocated_timers |= 1 << n; } /* * Check if this timer is available. * No mutual exclusion because only one thread uses this. */ static int hpet_timer_available(uint32_t allocated_timers, uint32_t n) { return ((allocated_timers & (1 << n)) == 0); } /* * Setup timer N to route its interrupt to I/O APIC. */ static void hpet_timer_set_up(hpet_info_t *hip, uint32_t timer_n, uint32_t interrupt) { uint64_t conf; conf = hpet_read_timer_N_config(hip, timer_n); /* * Caller is required to verify this interrupt route is supported. */ ASSERT(HPET_TIMER_N_INT_ROUTE_CAP(conf) & (1 << interrupt)); conf &= ~HPET_TIMER_N_FSB_EN_CNF_BIT; /* use IOAPIC */ conf |= HPET_TIMER_N_INT_ROUTE_SHIFT(interrupt); conf &= ~HPET_TIMER_N_TYPE_CNF_BIT; /* non periodic */ conf &= ~HPET_TIMER_N_INT_ENB_CNF_BIT; /* disabled */ conf |= HPET_TIMER_N_INT_TYPE_CNF_BIT; /* Level Triggered */ hpet_write_timer_N_config(hip, timer_n, conf); } /* * The HPET's Main Counter is not stopped before programming an HPET timer. * This will allow the HPET to be used as a time source. * The programmed timer interrupt may occur before this function returns. * Callers must block interrupts before calling this function if they must * guarantee the interrupt is handled after this function returns. * * Return 0 if main counter is less than timer after enabling timer. * The interrupt was programmed, but it may fire before this returns. * Return !0 if main counter is greater than timer after enabling timer. * In other words: the timer will not fire, and we do not know if it did fire. * * delta is in HPET ticks. * * Writing a 64-bit value to a 32-bit register will "wrap around". * A 32-bit HPET timer will wrap around in a little over 5 minutes. */ int hpet_timer_program(hpet_info_t *hip, uint32_t timer, uint64_t delta) { uint64_t time, program; program = hpet_read_main_counter_value(hip); program += delta; hpet_write_timer_N_comp(hip, timer, program); time = hpet_read_main_counter_value(hip); if (time < program) return (AE_OK); return (AE_TIME); } /* * CPR and power policy-change callback entry point. */ boolean_t hpet_callback(int code) { switch (code) { case PM_DEFAULT_CPU_DEEP_IDLE: /*FALLTHROUGH*/ case PM_ENABLE_CPU_DEEP_IDLE: /*FALLTHROUGH*/ case PM_DISABLE_CPU_DEEP_IDLE: return (hpet_deep_idle_config(code)); case CB_CODE_CPR_RESUME: /*FALLTHROUGH*/ case CB_CODE_CPR_CHKPT: return (hpet_cpr(code)); case CST_EVENT_MULTIPLE_CSTATES: hpet_cst_callback(CST_EVENT_MULTIPLE_CSTATES); return (B_TRUE); case CST_EVENT_ONE_CSTATE: hpet_cst_callback(CST_EVENT_ONE_CSTATE); return (B_TRUE); default: cmn_err(CE_NOTE, "!hpet_callback: invalid code %d\n", code); return (B_FALSE); } } /* * According to the HPET spec 1.0a: the Operating System must save and restore * HPET event timer hardware context through ACPI sleep state transitions. * Timer registers (including the main counter) may not be preserved through * ACPI S3, S4, or S5 sleep states. This code does not not support S1 nor S2. * * Current HPET state is already in hpet.supported and * hpet_state.proxy_installed. hpet_info contains the proxy interrupt HPET * Timer state. * * Future projects beware: the HPET Main Counter is undefined after ACPI S3 or * S4, and it is not saved/restored here. Future projects cannot expect the * Main Counter to be monotomically (or accurately) increasing across CPR. * * Note: the CPR Checkpoint path later calls pause_cpus() which ensures all * CPUs are awake and in a spin loop before the system suspends. The HPET is * not needed for Deep C-state wakeup when CPUs are in cpu_pause(). * It is safe to leave the HPET running as the system suspends; we just * disable the timer from generating interrupts here. */ static boolean_t hpet_cpr(int code) { ulong_t intr, dead_count = 0; hrtime_t dead = gethrtime() + hpet_spin_timeout; boolean_t ret = B_TRUE; mutex_enter(&hpet_state_lock); switch (code) { case CB_CODE_CPR_CHKPT: if (hpet_state.proxy_installed == B_FALSE) break; hpet_state.cpr = B_TRUE; intr = intr_clear(); while (!mutex_tryenter(&hpet_proxy_lock)) { /* * spin */ intr_restore(intr); if (dead_count++ > hpet_spin_check) { dead_count = 0; if (gethrtime() > dead) { hpet_state.cpr = B_FALSE; mutex_exit(&hpet_state_lock); cmn_err(CE_NOTE, "!hpet_cpr: deadman"); return (B_FALSE); } } intr = intr_clear(); } hpet_expire_all(); mutex_exit(&hpet_proxy_lock); intr_restore(intr); hpet_disable_timer(&hpet_info, hpet_info.cstate_timer.timer); break; case CB_CODE_CPR_RESUME: if (hpet_resume() == B_TRUE) hpet_state.cpr = B_FALSE; else cmn_err(CE_NOTE, "!hpet_resume failed."); break; default: cmn_err(CE_NOTE, "!hpet_cpr: invalid code %d\n", code); ret = B_FALSE; break; } mutex_exit(&hpet_state_lock); return (ret); } /* * Assume the HPET stopped in Suspend state and timer state was lost. */ static boolean_t hpet_resume(void) { if (hpet.supported != HPET_TIMER_SUPPORT) return (B_TRUE); /* * The HPET spec does not specify if Legacy Replacement Route is * on or off by default, so we set it off here. */ (void) hpet_set_leg_rt_cnf(&hpet_info, 0); if (hpet_start_main_counter(&hpet_info) != AE_OK) { cmn_err(CE_NOTE, "!hpet_resume: start main counter failed"); hpet.supported = HPET_NO_SUPPORT; if (hpet_state.proxy_installed == B_TRUE) { hpet_state.proxy_installed = B_FALSE; hpet_uninstall_interrupt_handler(); } return (B_FALSE); } if (hpet_state.proxy_installed == B_FALSE) return (B_TRUE); hpet_timer_set_up(&hpet_info, hpet_info.cstate_timer.timer, hpet_info.cstate_timer.intr); if (hpet_state.cpu_deep_idle == B_TRUE) hpet_enable_timer(&hpet_info, hpet_info.cstate_timer.timer); return (B_TRUE); } /* * Callback to enable/disable Deep C-States based on power.conf setting. */ static boolean_t hpet_deep_idle_config(int code) { ulong_t intr, dead_count = 0; hrtime_t dead = gethrtime() + hpet_spin_timeout; boolean_t ret = B_TRUE; mutex_enter(&hpet_state_lock); switch (code) { case PM_DEFAULT_CPU_DEEP_IDLE: /*FALLTHROUGH*/ case PM_ENABLE_CPU_DEEP_IDLE: if (hpet_state.cpu_deep_idle == B_TRUE) break; if (hpet_state.proxy_installed == B_FALSE) { ret = B_FALSE; /* Deep C-States not supported */ break; } hpet_enable_timer(&hpet_info, hpet_info.cstate_timer.timer); hpet_state.cpu_deep_idle = B_TRUE; break; case PM_DISABLE_CPU_DEEP_IDLE: if ((hpet_state.cpu_deep_idle == B_FALSE) || (hpet_state.proxy_installed == B_FALSE)) break; /* * The order of these operations is important to avoid * lost wakeups: Set a flag to refuse all future LAPIC Timer * proxy requests, then wake up all CPUs from deep C-state, * and finally disable the HPET interrupt-generating timer. */ hpet_state.cpu_deep_idle = B_FALSE; intr = intr_clear(); while (!mutex_tryenter(&hpet_proxy_lock)) { /* * spin */ intr_restore(intr); if (dead_count++ > hpet_spin_check) { dead_count = 0; if (gethrtime() > dead) { hpet_state.cpu_deep_idle = B_TRUE; mutex_exit(&hpet_state_lock); cmn_err(CE_NOTE, "!hpet_deep_idle_config: deadman"); return (B_FALSE); } } intr = intr_clear(); } hpet_expire_all(); mutex_exit(&hpet_proxy_lock); intr_restore(intr); hpet_disable_timer(&hpet_info, hpet_info.cstate_timer.timer); break; default: cmn_err(CE_NOTE, "!hpet_deep_idle_config: invalid code %d\n", code); ret = B_FALSE; break; } mutex_exit(&hpet_state_lock); return (ret); } /* * Callback for _CST c-state change notifications. */ static void hpet_cst_callback(uint32_t code) { ulong_t intr, dead_count = 0; hrtime_t dead = gethrtime() + hpet_spin_timeout; switch (code) { case CST_EVENT_ONE_CSTATE: hpet_state.uni_cstate = B_TRUE; intr = intr_clear(); while (!mutex_tryenter(&hpet_proxy_lock)) { /* * spin */ intr_restore(intr); if (dead_count++ > hpet_spin_check) { dead_count = 0; if (gethrtime() > dead) { hpet_expire_all(); cmn_err(CE_NOTE, "!hpet_cst_callback: deadman"); return; } } intr = intr_clear(); } hpet_expire_all(); mutex_exit(&hpet_proxy_lock); intr_restore(intr); break; case CST_EVENT_MULTIPLE_CSTATES: hpet_state.uni_cstate = B_FALSE; break; default: cmn_err(CE_NOTE, "!hpet_cst_callback: invalid code %d\n", code); break; } } /* * Interrupt Service Routine for HPET I/O-APIC-generated interrupts. * Used to wakeup CPUs from Deep C-state when their Local APIC Timer stops. * This ISR runs on one CPU which pokes other CPUs out of Deep C-state as * needed. */ /* ARGSUSED */ static uint_t hpet_isr(char *arg) { uint64_t timer_status; uint64_t timer_mask; ulong_t intr, dead_count = 0; hrtime_t dead = gethrtime() + hpet_isr_spin_timeout; timer_mask = HPET_INTR_STATUS_MASK(hpet_info.cstate_timer.timer); /* * We are using a level-triggered interrupt. * HPET sets timer's General Interrupt Status Register bit N. * ISR checks this bit to see if it needs servicing. * ISR then clears this bit by writing 1 to that bit. */ timer_status = hpet_read_gen_intrpt_stat(&hpet_info); if (!(timer_status & timer_mask)) return (DDI_INTR_UNCLAIMED); hpet_write_gen_intrpt_stat(&hpet_info, timer_mask); /* * Do not touch ISR data structures before checking the HPET's General * Interrupt Status register. The General Interrupt Status register * will not be set by hardware until after timer interrupt generation * is enabled by software. Software allocates necessary data * structures before enabling timer interrupts. ASSERT the software * data structures required to handle this interrupt are initialized. */ ASSERT(hpet_proxy_users != NULL); /* * CPUs in deep c-states do not enable interrupts until after * performing idle cleanup which includes descheduling themselves from * the HPET. The CPU running this ISR will NEVER find itself in the * proxy list. A lost wakeup may occur if this is false. */ ASSERT(hpet_proxy_users[CPU->cpu_id] == HPET_INFINITY); /* * Higher level interrupts may deadlock with CPUs going idle if this * ISR is prempted while holding hpet_proxy_lock. */ intr = intr_clear(); while (!mutex_tryenter(&hpet_proxy_lock)) { /* * spin */ intr_restore(intr); if (dead_count++ > hpet_spin_check) { dead_count = 0; if (gethrtime() > dead) { hpet_expire_all(); return (DDI_INTR_CLAIMED); } } intr = intr_clear(); } (void) hpet_guaranteed_schedule(HPET_INFINITY); mutex_exit(&hpet_proxy_lock); intr_restore(intr); return (DDI_INTR_CLAIMED); } /* * Used when disabling the HPET Timer interrupt. CPUs in Deep C-state must be * woken up because they can no longer rely on the HPET's Timer to wake them. * We do not need to wait for CPUs to wakeup. */ static void hpet_expire_all(void) { processorid_t id; for (id = 0; id < max_ncpus; ++id) { if (hpet_proxy_users[id] != HPET_INFINITY) { hpet_proxy_users[id] = HPET_INFINITY; if (id != CPU->cpu_id) poke_cpu(id); } } } /* * To avoid missed wakeups this function must guarantee either the HPET timer * was successfully programmed to the next expire time or there are no waiting * CPUs. * * Callers cannot enter C2 or deeper if the HPET could not be programmed to * generate its next interrupt to happen at required_wakeup_time or sooner. * Returns B_TRUE if the HPET was programmed to interrupt by * required_wakeup_time, B_FALSE if not. */ static boolean_t hpet_guaranteed_schedule(hrtime_t required_wakeup_time) { hrtime_t now, next_proxy_time; processorid_t id, next_proxy_id; int proxy_timer = hpet_info.cstate_timer.timer; boolean_t done = B_FALSE; ASSERT(mutex_owned(&hpet_proxy_lock)); /* * Loop until we successfully program the HPET, * or no CPUs are scheduled to use the HPET as a proxy. */ do { /* * Wake all CPUs that expired before now. * Find the next CPU to wake up and next HPET program time. */ now = gethrtime(); next_proxy_time = HPET_INFINITY; next_proxy_id = CPU->cpu_id; for (id = 0; id < max_ncpus; ++id) { if (hpet_proxy_users[id] < now) { hpet_proxy_users[id] = HPET_INFINITY; if (id != CPU->cpu_id) poke_cpu(id); } else if (hpet_proxy_users[id] < next_proxy_time) { next_proxy_time = hpet_proxy_users[id]; next_proxy_id = id; } } if (next_proxy_time == HPET_INFINITY) { done = B_TRUE; /* * There are currently no CPUs using the HPET's Timer * as a proxy for their LAPIC Timer. The HPET's Timer * does not need to be programmed. * * Letting the HPET timer wrap around to the current * time is the longest possible timeout. * A 64-bit timer will wrap around in ~ 2^44 seconds. * A 32-bit timer will wrap around in ~ 2^12 seconds. * * Disabling the HPET's timer interrupt requires a * (relatively expensive) write to the HPET. * Instead we do nothing. * * We are gambling some CPU will attempt to enter a * deep c-state before the timer wraps around. * We assume one spurious interrupt in a little over an * hour has less performance impact than writing to the * HPET's timer disable bit every time all CPUs wakeup * from deep c-state. */ } else { /* * Idle CPUs disable interrupts before programming the * HPET to prevent a lost wakeup if the HPET * interrupts the idle cpu before it can enter a * Deep C-State. */ if (hpet_timer_program(&hpet_info, proxy_timer, HRTIME_TO_HPET_TICKS(next_proxy_time - gethrtime())) != AE_OK) { /* * We could not program the HPET to wakeup the * next CPU. We must wake the CPU ourself to * avoid a lost wakeup. */ hpet_proxy_users[next_proxy_id] = HPET_INFINITY; if (next_proxy_id != CPU->cpu_id) poke_cpu(next_proxy_id); } else { done = B_TRUE; } } } while (!done); return (next_proxy_time <= required_wakeup_time); } /* * Use an HPET timer to act as this CPU's proxy local APIC timer. * Used in deep c-states C2 and above while the CPU's local APIC timer stalls. * Called by the idle thread with interrupts enabled. * Always returns with interrupts disabled. * * There are 3 possible outcomes from this function: * 1. The Local APIC Timer was already disabled before this function was called. * LAPIC TIMER : disabled * HPET : not scheduled to wake this CPU * *lapic_expire : (hrtime_t)HPET_INFINITY * Returns : B_TRUE * 2. Successfully programmed the HPET to act as a LAPIC Timer proxy. * LAPIC TIMER : disabled * HPET : scheduled to wake this CPU * *lapic_expire : hrtime_t when LAPIC timer would have expired * Returns : B_TRUE * 3. Failed to programmed the HPET to act as a LAPIC Timer proxy. * LAPIC TIMER : enabled * HPET : not scheduled to wake this CPU * *lapic_expire : (hrtime_t)HPET_INFINITY * Returns : B_FALSE * * The idle thread cannot enter Deep C-State in case 3. * The idle thread must re-enable & re-program the LAPIC_TIMER in case 2. */ static boolean_t hpet_use_hpet_timer(hrtime_t *lapic_expire) { extern hrtime_t apic_timer_stop_count(void); extern void apic_timer_restart(hrtime_t); hrtime_t now, expire, dead; uint64_t lapic_count, dead_count; cpupart_t *cpu_part; processorid_t cpu_sid; processorid_t cpu_id = CPU->cpu_id; processorid_t id; boolean_t rslt; boolean_t hset_update; cpu_part = CPU->cpu_part; cpu_sid = CPU->cpu_seqid; ASSERT(CPU->cpu_thread == CPU->cpu_idle_thread); /* * A critical section exists between when the HPET is programmed * to interrupt the CPU and when this CPU enters an idle state. * Interrupts must be blocked during that time to prevent lost * CBE wakeup interrupts from either LAPIC or HPET. * * Must block interrupts before acquiring hpet_proxy_lock to prevent * a deadlock with the ISR if the ISR runs on this CPU after the * idle thread acquires the mutex but before it clears interrupts. */ ASSERT(!interrupts_enabled()); lapic_count = apic_timer_stop_count(); now = gethrtime(); dead = now + hpet_idle_spin_timeout; *lapic_expire = expire = now + lapic_count; if (lapic_count == (hrtime_t)-1) { /* * LAPIC timer is currently disabled. * Will not use the HPET as a LAPIC Timer proxy. */ *lapic_expire = (hrtime_t)HPET_INFINITY; return (B_TRUE); } /* * Serialize hpet_proxy data structure manipulation. */ dead_count = 0; while (!mutex_tryenter(&hpet_proxy_lock)) { /* * spin */ apic_timer_restart(expire); sti(); cli(); if (dead_count++ > hpet_spin_check) { dead_count = 0; hset_update = (((CPU->cpu_flags & CPU_OFFLINE) == 0) && (ncpus > 1)); if (hset_update && !bitset_in_set(&cpu_part->cp_haltset, cpu_sid)) { *lapic_expire = (hrtime_t)HPET_INFINITY; return (B_FALSE); } } lapic_count = apic_timer_stop_count(); now = gethrtime(); *lapic_expire = expire = now + lapic_count; if (lapic_count == (hrtime_t)-1) { /* * LAPIC timer is currently disabled. * Will not use the HPET as a LAPIC Timer proxy. */ *lapic_expire = (hrtime_t)HPET_INFINITY; return (B_TRUE); } if (now > dead) { apic_timer_restart(expire); *lapic_expire = (hrtime_t)HPET_INFINITY; return (B_FALSE); } } if ((hpet_state.cpr == B_TRUE) || (hpet_state.cpu_deep_idle == B_FALSE) || (hpet_state.proxy_installed == B_FALSE) || (hpet_state.uni_cstate == B_TRUE)) { mutex_exit(&hpet_proxy_lock); apic_timer_restart(expire); *lapic_expire = (hrtime_t)HPET_INFINITY; return (B_FALSE); } hpet_proxy_users[cpu_id] = expire; /* * We are done if another cpu is scheduled on the HPET with an * expire time before us. The next HPET interrupt has been programmed * to fire before our expire time. */ for (id = 0; id < max_ncpus; ++id) { if ((hpet_proxy_users[id] <= expire) && (id != cpu_id)) { mutex_exit(&hpet_proxy_lock); return (B_TRUE); } } /* * We are the next lAPIC to expire. * Program the HPET with our expire time. */ rslt = hpet_guaranteed_schedule(expire); mutex_exit(&hpet_proxy_lock); if (rslt == B_FALSE) { apic_timer_restart(expire); *lapic_expire = (hrtime_t)HPET_INFINITY; } return (rslt); } /* * Called by the idle thread when waking up from Deep C-state before enabling * interrupts. With an array data structure it is faster to always remove * ourself from the array without checking if the HPET ISR already removed. * * We use a lazy algorithm for removing CPUs from the HPET's schedule. * We do not reprogram the HPET here because this CPU has real work to do. * On a idle system the CPU was probably woken up by the HPET's ISR. * On a heavily loaded system CPUs are not going into Deep C-state. * On a moderately loaded system another CPU will usually enter Deep C-state * and reprogram the HPET before the HPET fires with our wakeup. */ static void hpet_use_lapic_timer(hrtime_t expire) { extern void apic_timer_restart(hrtime_t); processorid_t cpu_id = CPU->cpu_id; ASSERT(CPU->cpu_thread == CPU->cpu_idle_thread); ASSERT(!interrupts_enabled()); hpet_proxy_users[cpu_id] = HPET_INFINITY; /* * Do not enable a LAPIC Timer that was initially disabled. */ if (expire != HPET_INFINITY) apic_timer_restart(expire); } /* * Initialize data structure to keep track of CPUs using HPET as a proxy for * their stalled local APIC timer. For now this is just an array. */ static void hpet_init_proxy_data(void) { processorid_t id; /* * Use max_ncpus for hot plug compliance. */ hpet_proxy_users = kmem_zalloc(max_ncpus * sizeof (*hpet_proxy_users), KM_SLEEP); /* * Unused entries always contain HPET_INFINITY. */ for (id = 0; id < max_ncpus; ++id) hpet_proxy_users[id] = HPET_INFINITY; }