diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/platforms/pseries/smp.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/platforms/pseries/smp.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/smp.c b/ANDROID_3.4.5/arch/powerpc/platforms/pseries/smp.c deleted file mode 100644 index e16bb8d4..00000000 --- a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/smp.c +++ /dev/null @@ -1,258 +0,0 @@ -/* - * SMP support for pSeries machines. - * - * Dave Engebretsen, Peter Bergner, and - * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com - * - * Plus various changes from other IBM teams... - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - - -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/smp.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/cache.h> -#include <linux/err.h> -#include <linux/device.h> -#include <linux/cpu.h> - -#include <asm/ptrace.h> -#include <linux/atomic.h> -#include <asm/irq.h> -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/io.h> -#include <asm/prom.h> -#include <asm/smp.h> -#include <asm/paca.h> -#include <asm/machdep.h> -#include <asm/cputable.h> -#include <asm/firmware.h> -#include <asm/rtas.h> -#include <asm/pSeries_reconfig.h> -#include <asm/mpic.h> -#include <asm/vdso_datapage.h> -#include <asm/cputhreads.h> -#include <asm/xics.h> - -#include "plpar_wrappers.h" -#include "pseries.h" -#include "offline_states.h" - - -/* - * The Primary thread of each non-boot processor was started from the OF client - * interface by prom_hold_cpus and is spinning on secondary_hold_spinloop. - */ -static cpumask_var_t of_spin_mask; - -/* Query where a cpu is now. Return codes #defined in plpar_wrappers.h */ -int smp_query_cpu_stopped(unsigned int pcpu) -{ - int cpu_status, status; - int qcss_tok = rtas_token("query-cpu-stopped-state"); - - if (qcss_tok == RTAS_UNKNOWN_SERVICE) { - printk_once(KERN_INFO - "Firmware doesn't support query-cpu-stopped-state\n"); - return QCSS_HARDWARE_ERROR; - } - - status = rtas_call(qcss_tok, 1, 2, &cpu_status, pcpu); - if (status != 0) { - printk(KERN_ERR - "RTAS query-cpu-stopped-state failed: %i\n", status); - return status; - } - - return cpu_status; -} - -/** - * smp_startup_cpu() - start the given cpu - * - * At boot time, there is nothing to do for primary threads which were - * started from Open Firmware. For anything else, call RTAS with the - * appropriate start location. - * - * Returns: - * 0 - failure - * 1 - success - */ -static inline int __devinit smp_startup_cpu(unsigned int lcpu) -{ - int status; - unsigned long start_here = __pa((u32)*((unsigned long *) - generic_secondary_smp_init)); - unsigned int pcpu; - int start_cpu; - - if (cpumask_test_cpu(lcpu, of_spin_mask)) - /* Already started by OF and sitting in spin loop */ - return 1; - - pcpu = get_hard_smp_processor_id(lcpu); - - /* Check to see if the CPU out of FW already for kexec */ - if (smp_query_cpu_stopped(pcpu) == QCSS_NOT_STOPPED){ - cpumask_set_cpu(lcpu, of_spin_mask); - return 1; - } - - /* Fixup atomic count: it exited inside IRQ handler. */ - task_thread_info(paca[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. - */ - start_cpu = rtas_token("start-cpu"); - if (start_cpu == RTAS_UNKNOWN_SERVICE) - return 1; - - status = rtas_call(start_cpu, 3, 1, NULL, pcpu, start_here, pcpu); - if (status != 0) { - printk(KERN_ERR "start-cpu failed: %i\n", status); - return 0; - } - -#ifdef CONFIG_HOTPLUG_CPU -out: -#endif - return 1; -} - -static void __devinit smp_xics_setup_cpu(int cpu) -{ - if (cpu != boot_cpuid) - xics_setup_cpu(); - - if (firmware_has_feature(FW_FEATURE_SPLPAR)) - 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 - pseries_notify_cpuidle_add_cpu(cpu); -} - -static int __devinit smp_pSeries_kick_cpu(int nr) -{ - BUG_ON(nr < 0 || nr >= NR_CPUS); - - if (!smp_startup_cpu(nr)) - return -ENOENT; - - /* - * The processor is currently spinning, waiting for the - * cpu_start field to become non-zero After we set cpu_start, - * the processor will continue on to secondary_start - */ - paca[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; -} - -static int smp_pSeries_cpu_bootable(unsigned int nr) -{ - /* Special case - we inhibit secondary thread startup - * during boot if the user requests it. - */ - if (system_state < SYSTEM_RUNNING && cpu_has_feature(CPU_FTR_SMT)) { - if (!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0) - return 0; - if (smt_enabled_at_boot - && cpu_thread_in_core(nr) >= smt_enabled_at_boot) - return 0; - } - - return 1; -} - -static struct smp_ops_t pSeries_mpic_smp_ops = { - .message_pass = smp_mpic_message_pass, - .probe = smp_mpic_probe, - .kick_cpu = smp_pSeries_kick_cpu, - .setup_cpu = smp_mpic_setup_cpu, -}; - -static struct smp_ops_t pSeries_xics_smp_ops = { - .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ - .cause_ipi = NULL, /* Filled at runtime by xics_smp_probe() */ - .probe = xics_smp_probe, - .kick_cpu = smp_pSeries_kick_cpu, - .setup_cpu = smp_xics_setup_cpu, - .cpu_bootable = smp_pSeries_cpu_bootable, -}; - -/* This is called very early */ -static void __init smp_init_pseries(void) -{ - int i; - - pr_debug(" -> smp_init_pSeries()\n"); - - alloc_bootmem_cpumask_var(&of_spin_mask); - - /* Mark threads which are still spinning in hold loops. */ - if (cpu_has_feature(CPU_FTR_SMT)) { - for_each_present_cpu(i) { - if (cpu_thread_in_core(i) == 0) - cpumask_set_cpu(i, of_spin_mask); - } - } else { - cpumask_copy(of_spin_mask, cpu_present_mask); - } - - cpumask_clear_cpu(boot_cpuid, of_spin_mask); - - /* Non-lpar has additional take/give timebase */ - if (rtas_token("freeze-time-base") != RTAS_UNKNOWN_SERVICE) { - smp_ops->give_timebase = rtas_give_timebase; - smp_ops->take_timebase = rtas_take_timebase; - } - - pr_debug(" <- smp_init_pSeries()\n"); -} - -void __init smp_init_pseries_mpic(void) -{ - smp_ops = &pSeries_mpic_smp_ops; - - smp_init_pseries(); -} - -void __init smp_init_pseries_xics(void) -{ - smp_ops = &pSeries_xics_smp_ops; - - smp_init_pseries(); -} |