diff --git a/Documentation/core-api/cpu_hotplug.rst b/Documentation/core-api/cpu_hotplug.rst index 4a50ab7817f7715b61da760e18711acfcd452380..b1ae1ac159cf91ebcd8b9a93b857c7299fecc03d 100644 --- a/Documentation/core-api/cpu_hotplug.rst +++ b/Documentation/core-api/cpu_hotplug.rst @@ -50,13 +50,6 @@ Command Line Switches This option is limited to the X86 and S390 architecture. -``cede_offline={"off","on"}`` - Use this option to disable/enable putting offlined processors to an extended - ``H_CEDE`` state on supported pseries platforms. If nothing is specified, - ``cede_offline`` is set to "on". - - This option is limited to the PowerPC architecture. - ``cpu0_hotplug`` Allow to shutdown CPU0. diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c index 3e8cbfe7a80fde257949e3c9bdaff97fd7191d21..d4b346355bb9eaea1b341bd57d34f13710c1148b 100644 --- a/arch/powerpc/platforms/pseries/hotplug-cpu.c +++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c @@ -35,54 +35,10 @@ #include #include "pseries.h" -#include "offline_states.h" /* This version can't take the spinlock, because it never returns */ static int rtas_stop_self_token = RTAS_UNKNOWN_SERVICE; -static DEFINE_PER_CPU(enum cpu_state_vals, preferred_offline_state) = - CPU_STATE_OFFLINE; -static DEFINE_PER_CPU(enum cpu_state_vals, current_state) = CPU_STATE_OFFLINE; - -static enum cpu_state_vals default_offline_state = CPU_STATE_OFFLINE; - -static bool cede_offline_enabled __read_mostly = true; - -/* - * Enable/disable cede_offline when available. - */ -static int __init setup_cede_offline(char *str) -{ - return (kstrtobool(str, &cede_offline_enabled) == 0); -} - -__setup("cede_offline=", setup_cede_offline); - -enum cpu_state_vals get_cpu_current_state(int cpu) -{ - return per_cpu(current_state, cpu); -} - -void set_cpu_current_state(int cpu, enum cpu_state_vals state) -{ - per_cpu(current_state, cpu) = state; -} - -enum cpu_state_vals get_preferred_offline_state(int cpu) -{ - return per_cpu(preferred_offline_state, cpu); -} - -void set_preferred_offline_state(int cpu, enum cpu_state_vals state) -{ - per_cpu(preferred_offline_state, cpu) = state; -} - -void set_default_offline_state(int cpu) -{ - per_cpu(preferred_offline_state, cpu) = default_offline_state; -} - static void rtas_stop_self(void) { static struct rtas_args args; @@ -101,9 +57,7 @@ static void rtas_stop_self(void) static void pseries_mach_cpu_die(void) { - unsigned int cpu = smp_processor_id(); unsigned int hwcpu = hard_smp_processor_id(); - u8 cede_latency_hint = 0; local_irq_disable(); idle_task_exit(); @@ -112,49 +66,6 @@ static void pseries_mach_cpu_die(void) else xics_teardown_cpu(); - if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) { - set_cpu_current_state(cpu, CPU_STATE_INACTIVE); - if (ppc_md.suspend_disable_cpu) - ppc_md.suspend_disable_cpu(); - - cede_latency_hint = 2; - - get_lppaca()->idle = 1; - if (!lppaca_shared_proc(get_lppaca())) - get_lppaca()->donate_dedicated_cpu = 1; - - while (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) { - while (!prep_irq_for_idle()) { - local_irq_enable(); - local_irq_disable(); - } - - extended_cede_processor(cede_latency_hint); - } - - local_irq_disable(); - - if (!lppaca_shared_proc(get_lppaca())) - get_lppaca()->donate_dedicated_cpu = 0; - get_lppaca()->idle = 0; - - if (get_preferred_offline_state(cpu) == CPU_STATE_ONLINE) { - unregister_slb_shadow(hwcpu); - - hard_irq_disable(); - /* - * Call to start_secondary_resume() will not return. - * Kernel stack will be reset and start_secondary() - * will be called to continue the online operation. - */ - start_secondary_resume(); - } - } - - /* Requested state is CPU_STATE_OFFLINE at this point */ - WARN_ON(get_preferred_offline_state(cpu) != CPU_STATE_OFFLINE); - - set_cpu_current_state(cpu, CPU_STATE_OFFLINE); unregister_slb_shadow(hwcpu); rtas_stop_self(); @@ -200,24 +111,13 @@ static void pseries_cpu_die(unsigned int cpu) int cpu_status = 1; unsigned int pcpu = get_hard_smp_processor_id(cpu); - if (get_preferred_offline_state(cpu) == CPU_STATE_INACTIVE) { - cpu_status = 1; - for (tries = 0; tries < 5000; tries++) { - if (get_cpu_current_state(cpu) == CPU_STATE_INACTIVE) { - cpu_status = 0; - break; - } - msleep(1); - } - } else if (get_preferred_offline_state(cpu) == CPU_STATE_OFFLINE) { + for (tries = 0; tries < 25; tries++) { + cpu_status = smp_query_cpu_stopped(pcpu); + if (cpu_status == QCSS_STOPPED || + cpu_status == QCSS_HARDWARE_ERROR) + break; + cpu_relax(); - for (tries = 0; tries < 25; tries++) { - cpu_status = smp_query_cpu_stopped(pcpu); - if (cpu_status == QCSS_STOPPED || - cpu_status == QCSS_HARDWARE_ERROR) - break; - cpu_relax(); - } } if (cpu_status != 0) { @@ -359,28 +259,15 @@ static int dlpar_offline_cpu(struct device_node *dn) if (get_hard_smp_processor_id(cpu) != thread) continue; - if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE) + if (!cpu_online(cpu)) break; - if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) { - set_preferred_offline_state(cpu, - CPU_STATE_OFFLINE); - cpu_maps_update_done(); - timed_topology_update(1); - rc = device_offline(get_cpu_device(cpu)); - if (rc) - goto out; - cpu_maps_update_begin(); - break; - } - - /* - * The cpu is in CPU_STATE_INACTIVE. - * Upgrade it's state to CPU_STATE_OFFLINE. - */ - set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); - WARN_ON(plpar_hcall_norets(H_PROD, thread) != H_SUCCESS); - __cpu_die(cpu); + cpu_maps_update_done(); + timed_topology_update(1); + rc = device_offline(get_cpu_device(cpu)); + if (rc) + goto out; + cpu_maps_update_begin(); break; } if (cpu == num_possible_cpus()) { @@ -414,8 +301,6 @@ static int dlpar_online_cpu(struct device_node *dn) for_each_present_cpu(cpu) { if (get_hard_smp_processor_id(cpu) != thread) continue; - BUG_ON(get_cpu_current_state(cpu) - != CPU_STATE_OFFLINE); cpu_maps_update_done(); timed_topology_update(1); find_and_online_cpu_nid(cpu); @@ -1013,27 +898,8 @@ static struct notifier_block pseries_smp_nb = { .notifier_call = pseries_smp_notifier, }; -#define MAX_CEDE_LATENCY_LEVELS 4 -#define CEDE_LATENCY_PARAM_LENGTH 10 -#define CEDE_LATENCY_PARAM_MAX_LENGTH \ - (MAX_CEDE_LATENCY_LEVELS * CEDE_LATENCY_PARAM_LENGTH * sizeof(char)) -#define CEDE_LATENCY_TOKEN 45 - -static char cede_parameters[CEDE_LATENCY_PARAM_MAX_LENGTH]; - -static int parse_cede_parameters(void) -{ - memset(cede_parameters, 0, CEDE_LATENCY_PARAM_MAX_LENGTH); - return rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, - NULL, - CEDE_LATENCY_TOKEN, - __pa(cede_parameters), - CEDE_LATENCY_PARAM_MAX_LENGTH); -} - static int __init pseries_cpu_hotplug_init(void) { - int cpu; int qcss_tok; #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE @@ -1056,16 +922,8 @@ static int __init pseries_cpu_hotplug_init(void) smp_ops->cpu_die = pseries_cpu_die; /* Processors can be added/removed only on LPAR */ - if (firmware_has_feature(FW_FEATURE_LPAR)) { + if (firmware_has_feature(FW_FEATURE_LPAR)) of_reconfig_notifier_register(&pseries_smp_nb); - cpu_maps_update_begin(); - if (cede_offline_enabled && parse_cede_parameters() == 0) { - default_offline_state = CPU_STATE_INACTIVE; - for_each_online_cpu(cpu) - set_default_offline_state(cpu); - } - cpu_maps_update_done(); - } return 0; } diff --git a/arch/powerpc/platforms/pseries/offline_states.h b/arch/powerpc/platforms/pseries/offline_states.h deleted file mode 100644 index 51414aee2862547fef4c0fbe6c2aeef05c8df26b..0000000000000000000000000000000000000000 --- a/arch/powerpc/platforms/pseries/offline_states.h +++ /dev/null @@ -1,38 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _OFFLINE_STATES_H_ -#define _OFFLINE_STATES_H_ - -/* Cpu offline states go here */ -enum cpu_state_vals { - CPU_STATE_OFFLINE, - CPU_STATE_INACTIVE, - CPU_STATE_ONLINE, - CPU_MAX_OFFLINE_STATES -}; - -#ifdef CONFIG_HOTPLUG_CPU -extern enum cpu_state_vals get_cpu_current_state(int cpu); -extern void set_cpu_current_state(int cpu, enum cpu_state_vals state); -extern void set_preferred_offline_state(int cpu, enum cpu_state_vals state); -extern void set_default_offline_state(int cpu); -#else -static inline enum cpu_state_vals get_cpu_current_state(int cpu) -{ - return CPU_STATE_ONLINE; -} - -static inline void set_cpu_current_state(int cpu, enum cpu_state_vals state) -{ -} - -static inline void set_preferred_offline_state(int cpu, enum cpu_state_vals state) -{ -} - -static inline void set_default_offline_state(int cpu) -{ -} -#endif - -extern enum cpu_state_vals get_preferred_offline_state(int cpu); -#endif diff --git a/arch/powerpc/platforms/pseries/pmem.c b/arch/powerpc/platforms/pseries/pmem.c index 2347e1038f58bb7d2a903735263c4662474168ea..e1dc5d3254df9cccf298d117e30d134353d95b4a 100644 --- a/arch/powerpc/platforms/pseries/pmem.c +++ b/arch/powerpc/platforms/pseries/pmem.c @@ -24,7 +24,6 @@ #include #include "pseries.h" -#include "offline_states.h" static struct device_node *pmem_node; diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c index 6891710833be5bafe4797ccd9a424861443cdd57..7ebacac03dc36f6422a43d78c0c19e3976704ee9 100644 --- a/arch/powerpc/platforms/pseries/smp.c +++ b/arch/powerpc/platforms/pseries/smp.c @@ -44,8 +44,6 @@ #include #include "pseries.h" -#include "offline_states.h" - /* * The Primary thread of each non-boot processor was started from the OF client @@ -108,10 +106,7 @@ static inline int smp_startup_cpu(unsigned int lcpu) /* Fixup atomic count: it exited inside IRQ handler. */ task_thread_info(paca_ptrs[lcpu]->__current)->preempt_count = 0; -#ifdef CONFIG_HOTPLUG_CPU - if (get_cpu_current_state(lcpu) == CPU_STATE_INACTIVE) - goto out; -#endif + /* * If the RTAS start-cpu token does not exist then presume the * cpu is already spinning. @@ -126,9 +121,6 @@ static inline int smp_startup_cpu(unsigned int lcpu) return 0; } -#ifdef CONFIG_HOTPLUG_CPU -out: -#endif return 1; } @@ -143,10 +135,6 @@ static void smp_setup_cpu(int cpu) vpa_init(cpu); cpumask_clear_cpu(cpu, of_spin_mask); -#ifdef CONFIG_HOTPLUG_CPU - set_cpu_current_state(cpu, CPU_STATE_ONLINE); - set_default_offline_state(cpu); -#endif } static int smp_pSeries_kick_cpu(int nr) @@ -163,20 +151,6 @@ static int smp_pSeries_kick_cpu(int nr) * the processor will continue on to secondary_start */ paca_ptrs[nr]->cpu_start = 1; -#ifdef CONFIG_HOTPLUG_CPU - set_preferred_offline_state(nr, CPU_STATE_ONLINE); - - if (get_cpu_current_state(nr) == CPU_STATE_INACTIVE) { - long rc; - unsigned long hcpuid; - - hcpuid = get_hard_smp_processor_id(nr); - rc = plpar_hcall_norets(H_PROD, hcpuid); - if (rc != H_SUCCESS) - printk(KERN_ERR "Error: Prod to wake up processor %d " - "Ret= %ld\n", nr, rc); - } -#endif return 0; }