Lines Matching +full:ecx +full:- +full:1000
1 // SPDX-License-Identifier: GPL-2.0-only
3 * intel_idle.c - native hardware idle loop for modern Intel processors
5 * Copyright (c) 2013 - 2020, Intel Corporation.
23 * for preventing entry into deep C-states
25 * CPU will flush caches as needed when entering a C-state via MWAIT
33 * ACPI has a .suspend hack to turn off deep c-statees during suspend
39 /* un-comment DEBUG to enable pr_debug() statements */
56 #include <asm/intel-family.h>
58 #include <asm/spec-ctrl.h>
69 static int max_cstate = CPUIDLE_STATE_MAX - 1;
89 * Hardware C-state auto-demotion may not always be optimal.
104 * Enable interrupts before entering the C-state. On some platforms and for
105 * some C-states, this may measurably decrease interrupt latency.
121 * Initialize large xstate for the C6-state entrance.
126 * Ignore the sub-state when matching mwait hints between the ACPI _CST and
132 * MWAIT takes an 8-bit "hint" in EAX "suggesting"
133 * the C-state (top nibble) and sub-state (bottom nibble)
145 struct cpuidle_state *state = &drv->states[index]; in __intel_idle()
146 unsigned long eax = flg2MWAIT(state->flags); in __intel_idle()
147 unsigned long ecx = 1*irqoff; /* break on interrupt flag */ in __intel_idle() local
149 mwait_idle_with_hints(eax, ecx); in __intel_idle()
155 * intel_idle - Ask the processor to enter the given idle state.
164 * enable one-shot tick broadcasting for the target CPU before executing MWAIT.
206 * intel_idle_s2idle - Ask the processor to enter the given idle state.
214 * Invoked as a suspend-to-idle callback routine with frozen user space, frozen
220 unsigned long ecx = 1; /* break on interrupt flag */ in intel_idle_s2idle() local
221 struct cpuidle_state *state = &drv->states[index]; in intel_idle_s2idle()
222 unsigned long eax = flg2MWAIT(state->flags); in intel_idle_s2idle()
224 if (state->flags & CPUIDLE_FLAG_INIT_XSTATE) in intel_idle_s2idle()
227 mwait_idle_with_hints(eax, ecx); in intel_idle_s2idle()
1067 .target_residency = 1000,
1273 .exit_latency = 1000,
1274 .target_residency = 1000,
1676 unsigned long eax = flg2MWAIT(state->flags); in intel_idle_state_needs_timer_stop()
1682 * Switch over to one-shot tick broadcast if the target C-state in intel_idle_state_needs_timer_stop()
1702 * intel_idle_cst_usable - Check if the _CST information can be used.
1704 * Check if all of the C-states listed by _CST in the max_cstate range are
1717 if (cx->entry_method != ACPI_CSTATE_FFH) in intel_idle_cst_usable()
1739 if (acpi_processor_evaluate_cst(pr->handle, cpu, &acpi_state_table)) in intel_idle_acpi_cst_extract()
1770 if (intel_idle_max_cstate_reached(cstate - 1)) in intel_idle_init_cstates_acpi()
1775 state = &drv->states[drv->state_count++]; in intel_idle_init_cstates_acpi()
1777 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d_ACPI", cstate); in intel_idle_init_cstates_acpi()
1778 strscpy(state->desc, cx->desc, CPUIDLE_DESC_LEN); in intel_idle_init_cstates_acpi()
1779 state->exit_latency = cx->latency; in intel_idle_init_cstates_acpi()
1781 * For C1-type C-states use the same number for both the exit in intel_idle_init_cstates_acpi()
1783 * C1 in the majority of the static C-states tables above. in intel_idle_init_cstates_acpi()
1784 * For the other types of C-states, however, set the target in intel_idle_init_cstates_acpi()
1786 * a reasonable balance between energy-efficiency and in intel_idle_init_cstates_acpi()
1789 state->target_residency = cx->latency; in intel_idle_init_cstates_acpi()
1790 if (cx->type > ACPI_STATE_C1) in intel_idle_init_cstates_acpi()
1791 state->target_residency *= 3; in intel_idle_init_cstates_acpi()
1793 state->flags = MWAIT2flg(cx->address); in intel_idle_init_cstates_acpi()
1794 if (cx->type > ACPI_STATE_C2) in intel_idle_init_cstates_acpi()
1795 state->flags |= CPUIDLE_FLAG_TLB_FLUSHED; in intel_idle_init_cstates_acpi()
1798 state->flags |= CPUIDLE_FLAG_OFF; in intel_idle_init_cstates_acpi()
1801 state->flags |= CPUIDLE_FLAG_TIMER_STOP; in intel_idle_init_cstates_acpi()
1803 if (cx->type > ACPI_STATE_C1 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) in intel_idle_init_cstates_acpi()
1806 state->enter = intel_idle; in intel_idle_init_cstates_acpi()
1807 state->enter_s2idle = intel_idle_s2idle; in intel_idle_init_cstates_acpi()
1816 * If there are no _CST C-states, do not disable any C-states by in intel_idle_off_by_default()
1853 * ivt_idle_state_table_update - Tune the idle states table for Ivy Town.
1855 * Tune IVT multi-socket targets.
1860 /* IVT uses a different table for 1-2, 3-4, and > 4 sockets */ in ivt_idle_state_table_update()
1882 * irtl_2_usec - IRTL to microseconds conversion.
1903 * bxt_idle_state_table_update - Fix up the Broxton idle states table.
1951 * sklh_idle_state_table_update - Fix up the Sky Lake idle states table.
1953 * On SKL-H (model 0x5e) skip C8 and C9 if C10 is enabled and SGX disabled.
1958 unsigned int eax, ebx, ecx, edx; in sklh_idle_state_table_update() local
1971 /* PC10 is not enabled in PKG C-state limit */ in sklh_idle_state_table_update()
1975 ecx = 0; in sklh_idle_state_table_update()
1976 cpuid(7, &eax, &ebx, &ecx, &edx); in sklh_idle_state_table_update()
1988 skl_cstates[5].flags |= CPUIDLE_FLAG_UNUSABLE; /* C8-SKL */ in sklh_idle_state_table_update()
1989 skl_cstates[6].flags |= CPUIDLE_FLAG_UNUSABLE; /* C9-SKL */ in sklh_idle_state_table_update()
1993 * skx_idle_state_table_update - Adjust the Sky Lake/Cascade Lake
2003 * 000b: C0/C1 (no package C-state support) in skx_idle_state_table_update()
2005 * 010b: C6 (non-retention) in skx_idle_state_table_update()
2023 * adl_idle_state_table_update - Adjust AlderLake idle states table.
2042 * spr_idle_state_table_update - Adjust Sapphire Rapids idle states table.
2049 * By default, the C6 state assumes the worst-case scenario of package in spr_idle_state_table_update()
2069 /* Ignore the C-state if there are NO sub-states in CPUID for it. */ in intel_idle_verify_cstate()
2081 if (state->flags & CPUIDLE_FLAG_INIT_XSTATE) { in state_update_enter_method()
2086 WARN_ON_ONCE(state->flags & CPUIDLE_FLAG_IBRS); in state_update_enter_method()
2087 WARN_ON_ONCE(state->flags & CPUIDLE_FLAG_IRQ_ENABLE); in state_update_enter_method()
2088 state->enter = intel_idle_xstate; in state_update_enter_method()
2093 ((state->flags & CPUIDLE_FLAG_IBRS) || ibrs_off)) { in state_update_enter_method()
2095 * IBRS mitigation requires that C-states are entered in state_update_enter_method()
2098 if (ibrs_off && (state->flags & CPUIDLE_FLAG_IRQ_ENABLE)) in state_update_enter_method()
2099 state->flags &= ~CPUIDLE_FLAG_IRQ_ENABLE; in state_update_enter_method()
2100 WARN_ON_ONCE(state->flags & CPUIDLE_FLAG_IRQ_ENABLE); in state_update_enter_method()
2101 state->enter = intel_idle_ibrs; in state_update_enter_method()
2105 if (state->flags & CPUIDLE_FLAG_IRQ_ENABLE) { in state_update_enter_method()
2106 state->enter = intel_idle_irq; in state_update_enter_method()
2112 state->enter = intel_idle_irq; in state_update_enter_method()
2168 drv->states[drv->state_count] = cpuidle_state_table[cstate]; in intel_idle_init_cstates_icpu()
2169 state = &drv->states[drv->state_count]; in intel_idle_init_cstates_icpu()
2174 if ((disabled_states_mask & BIT(drv->state_count)) || in intel_idle_init_cstates_icpu()
2175 ((icpu->use_acpi || force_use_acpi) && in intel_idle_init_cstates_icpu()
2176 intel_idle_off_by_default(state->flags, mwait_hint) && in intel_idle_init_cstates_icpu()
2177 !(state->flags & CPUIDLE_FLAG_ALWAYS_ENABLE))) in intel_idle_init_cstates_icpu()
2178 state->flags |= CPUIDLE_FLAG_OFF; in intel_idle_init_cstates_icpu()
2181 state->flags |= CPUIDLE_FLAG_TIMER_STOP; in intel_idle_init_cstates_icpu()
2183 drv->state_count++; in intel_idle_init_cstates_icpu()
2186 if (icpu->byt_auto_demotion_disable_flag) { in intel_idle_init_cstates_icpu()
2193 * intel_idle_cpuidle_driver_init - Create the list of available idle states.
2201 drv->states[0].flags |= CPUIDLE_FLAG_OFF; in intel_idle_cpuidle_driver_init()
2203 drv->state_count = 1; in intel_idle_cpuidle_driver_init()
2205 if (icpu && icpu->state_table) in intel_idle_cpuidle_driver_init()
2239 * intel_idle_cpu_init - Register the target CPU with the cpuidle core.
2250 dev->cpu = cpu; in intel_idle_cpu_init()
2254 return -EIO; in intel_idle_cpu_init()
2281 if (!dev->registered) in intel_idle_cpu_online()
2288 * intel_idle_cpuidle_devices_uninit - Unregister all cpuidle devices.
2301 unsigned int eax, ebx, ecx; in intel_idle_init() local
2306 return -ENODEV; in intel_idle_init()
2310 return -EPERM; in intel_idle_init()
2317 return -ENODEV; in intel_idle_init()
2322 return -ENODEV; in intel_idle_init()
2325 cpuid(CPUID_LEAF_MWAIT, &eax, &ebx, &ecx, &mwait_substates); in intel_idle_init()
2327 if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) || in intel_idle_init()
2328 !(ecx & CPUID5_ECX_INTERRUPT_BREAK) || in intel_idle_init()
2330 return -ENODEV; in intel_idle_init()
2334 icpu = (const struct idle_cpu *)id->driver_data; in intel_idle_init()
2336 if (icpu->state_table) in intel_idle_init()
2337 cpuidle_state_table = icpu->state_table; in intel_idle_init()
2339 return -ENODEV; in intel_idle_init()
2341 auto_demotion_disable_flags = icpu->auto_demotion_disable_flags; in intel_idle_init()
2342 if (icpu->disable_promotion_to_c1e) in intel_idle_init()
2344 if (icpu->use_acpi || force_use_acpi) in intel_idle_init()
2347 return -ENODEV; in intel_idle_init()
2355 return -ENOMEM; in intel_idle_init()
2363 drv ? drv->name : "none"); in intel_idle_init()
2373 boot_cpu_has(X86_FEATURE_ARAT) ? "all C-states" : "C1"); in intel_idle_init()
2389 * support "intel_idle.max_cstate=..." at boot and also a read-only export of
2390 * it at /sys/module/intel_idle/parameters/max_cstate -- so using module_param
2403 * Some platforms come with mutually exclusive C-states, so that if one is
2404 * enabled, the other C-states must not be used. Example: C1 and C1E on
2406 * preferred C-states among the groups of mutually exclusive C-states - the
2407 * selected C-states will be registered, the other C-states from the mutually
2409 * exclusive C-states, this parameter has no effect.
2414 * Debugging option that forces the driver to enter all C-states with
2415 * interrupts enabled. Does not apply to C-states with