forked from Minki/linux
9d53caec84
A large sun4v SPARC system may have moments of intensive xcall activities, usually caused by unmapping many pages on many CPUs concurrently. This can flood receivers with CPU mondo interrupts for an extended period, causing some unlucky senders to hit send-mondo timeout. This problem gets worse as cpu count increases because sometimes mappings must be invalidated on all CPUs, and sometimes all CPUs may gang up on a single CPU. But a busy system is not a broken system. In the above scenario, as long as the receiver is making forward progress processing mondo interrupts, the sender should continue to retry. This patch implements the receiver's forward progress meter by introducing a per cpu counter 'cpu_mondo_counter[cpu]' where 'cpu' is in the range of 0..NR_CPUS. The receiver increments its counter as soon as it receives a mondo and the sender tracks the receiver's counter. If the receiver has stopped making forward progress when the retry limit is reached, the sender declares send-mondo-timeout and panic; otherwise, the receiver is allowed to keep making forward progress. In addition, it's been observed that PCIe hotplug events generate Correctable Errors that are handled by hypervisor and then OS. Hypervisor 'borrows' a guest cpu strand briefly to provide the service. If the cpu strand is simultaneously the only cpu targeted by a mondo, it may not be available for the mondo in 20msec, causing SUN4V mondo timeout. It appears that 1 second is the agreed wait time between hypervisor and guest OS, this patch makes the adjustment. Orabug: 25476541 Orabug: 26417466 Signed-off-by: Jane Chu <jane.chu@oracle.com> Reviewed-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Reviewed-by: Rob Gardner <rob.gardner@oracle.com> Reviewed-by: Thomas Tai <thomas.tai@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1612 lines
39 KiB
C
1612 lines
39 KiB
C
/* smp.c: Sparc64 SMP support.
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*
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* Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/hotplug.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/threads.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <linux/cache.h>
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#include <linux/jiffies.h>
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#include <linux/profile.h>
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#include <linux/bootmem.h>
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#include <linux/vmalloc.h>
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#include <linux/ftrace.h>
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#include <linux/cpu.h>
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#include <linux/slab.h>
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#include <linux/kgdb.h>
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#include <asm/head.h>
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#include <asm/ptrace.h>
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#include <linux/atomic.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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#include <asm/cpudata.h>
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#include <asm/hvtramp.h>
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#include <asm/io.h>
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#include <asm/timer.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/irq_regs.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/oplib.h>
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#include <linux/uaccess.h>
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#include <asm/starfire.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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#include <asm/prom.h>
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#include <asm/mdesc.h>
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#include <asm/ldc.h>
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#include <asm/hypervisor.h>
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#include <asm/pcr.h>
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#include "cpumap.h"
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#include "kernel.h"
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DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
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cpumask_t cpu_core_map[NR_CPUS] __read_mostly =
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{ [0 ... NR_CPUS-1] = CPU_MASK_NONE };
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cpumask_t cpu_core_sib_map[NR_CPUS] __read_mostly = {
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[0 ... NR_CPUS-1] = CPU_MASK_NONE };
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cpumask_t cpu_core_sib_cache_map[NR_CPUS] __read_mostly = {
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[0 ... NR_CPUS - 1] = CPU_MASK_NONE };
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EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
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EXPORT_SYMBOL(cpu_core_map);
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EXPORT_SYMBOL(cpu_core_sib_map);
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EXPORT_SYMBOL(cpu_core_sib_cache_map);
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static cpumask_t smp_commenced_mask;
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void smp_info(struct seq_file *m)
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{
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int i;
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seq_printf(m, "State:\n");
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for_each_online_cpu(i)
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seq_printf(m, "CPU%d:\t\tonline\n", i);
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}
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void smp_bogo(struct seq_file *m)
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{
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int i;
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for_each_online_cpu(i)
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seq_printf(m,
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"Cpu%dClkTck\t: %016lx\n",
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i, cpu_data(i).clock_tick);
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}
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extern void setup_sparc64_timer(void);
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static volatile unsigned long callin_flag = 0;
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void smp_callin(void)
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{
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int cpuid = hard_smp_processor_id();
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__local_per_cpu_offset = __per_cpu_offset(cpuid);
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if (tlb_type == hypervisor)
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sun4v_ktsb_register();
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__flush_tlb_all();
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setup_sparc64_timer();
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if (cheetah_pcache_forced_on)
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cheetah_enable_pcache();
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callin_flag = 1;
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__asm__ __volatile__("membar #Sync\n\t"
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"flush %%g6" : : : "memory");
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/* Clear this or we will die instantly when we
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* schedule back to this idler...
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*/
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current_thread_info()->new_child = 0;
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/* Attach to the address space of init_task. */
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mmgrab(&init_mm);
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current->active_mm = &init_mm;
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/* inform the notifiers about the new cpu */
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notify_cpu_starting(cpuid);
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while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
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rmb();
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set_cpu_online(cpuid, true);
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/* idle thread is expected to have preempt disabled */
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preempt_disable();
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local_irq_enable();
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cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
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}
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void cpu_panic(void)
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{
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printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
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panic("SMP bolixed\n");
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}
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/* This tick register synchronization scheme is taken entirely from
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* the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit.
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*
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* The only change I've made is to rework it so that the master
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* initiates the synchonization instead of the slave. -DaveM
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*/
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#define MASTER 0
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#define SLAVE (SMP_CACHE_BYTES/sizeof(unsigned long))
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#define NUM_ROUNDS 64 /* magic value */
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#define NUM_ITERS 5 /* likewise */
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static DEFINE_RAW_SPINLOCK(itc_sync_lock);
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static unsigned long go[SLAVE + 1];
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#define DEBUG_TICK_SYNC 0
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static inline long get_delta (long *rt, long *master)
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{
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unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0;
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unsigned long tcenter, t0, t1, tm;
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unsigned long i;
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for (i = 0; i < NUM_ITERS; i++) {
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t0 = tick_ops->get_tick();
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go[MASTER] = 1;
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membar_safe("#StoreLoad");
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while (!(tm = go[SLAVE]))
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rmb();
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go[SLAVE] = 0;
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wmb();
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t1 = tick_ops->get_tick();
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if (t1 - t0 < best_t1 - best_t0)
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best_t0 = t0, best_t1 = t1, best_tm = tm;
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}
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*rt = best_t1 - best_t0;
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*master = best_tm - best_t0;
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/* average best_t0 and best_t1 without overflow: */
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tcenter = (best_t0/2 + best_t1/2);
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if (best_t0 % 2 + best_t1 % 2 == 2)
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tcenter++;
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return tcenter - best_tm;
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}
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void smp_synchronize_tick_client(void)
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{
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long i, delta, adj, adjust_latency = 0, done = 0;
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unsigned long flags, rt, master_time_stamp;
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#if DEBUG_TICK_SYNC
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struct {
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long rt; /* roundtrip time */
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long master; /* master's timestamp */
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long diff; /* difference between midpoint and master's timestamp */
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long lat; /* estimate of itc adjustment latency */
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} t[NUM_ROUNDS];
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#endif
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go[MASTER] = 1;
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while (go[MASTER])
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rmb();
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local_irq_save(flags);
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{
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for (i = 0; i < NUM_ROUNDS; i++) {
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delta = get_delta(&rt, &master_time_stamp);
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if (delta == 0)
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done = 1; /* let's lock on to this... */
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if (!done) {
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if (i > 0) {
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adjust_latency += -delta;
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adj = -delta + adjust_latency/4;
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} else
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adj = -delta;
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tick_ops->add_tick(adj);
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}
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#if DEBUG_TICK_SYNC
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t[i].rt = rt;
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t[i].master = master_time_stamp;
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t[i].diff = delta;
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t[i].lat = adjust_latency/4;
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#endif
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}
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}
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local_irq_restore(flags);
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#if DEBUG_TICK_SYNC
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for (i = 0; i < NUM_ROUNDS; i++)
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printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n",
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t[i].rt, t[i].master, t[i].diff, t[i].lat);
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#endif
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printk(KERN_INFO "CPU %d: synchronized TICK with master CPU "
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"(last diff %ld cycles, maxerr %lu cycles)\n",
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smp_processor_id(), delta, rt);
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}
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static void smp_start_sync_tick_client(int cpu);
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static void smp_synchronize_one_tick(int cpu)
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{
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unsigned long flags, i;
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go[MASTER] = 0;
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smp_start_sync_tick_client(cpu);
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/* wait for client to be ready */
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while (!go[MASTER])
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rmb();
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/* now let the client proceed into his loop */
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go[MASTER] = 0;
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membar_safe("#StoreLoad");
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raw_spin_lock_irqsave(&itc_sync_lock, flags);
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{
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for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) {
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while (!go[MASTER])
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rmb();
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go[MASTER] = 0;
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wmb();
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go[SLAVE] = tick_ops->get_tick();
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membar_safe("#StoreLoad");
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}
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}
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raw_spin_unlock_irqrestore(&itc_sync_lock, flags);
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}
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#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
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static void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg,
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void **descrp)
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{
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extern unsigned long sparc64_ttable_tl0;
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extern unsigned long kern_locked_tte_data;
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struct hvtramp_descr *hdesc;
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unsigned long trampoline_ra;
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struct trap_per_cpu *tb;
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u64 tte_vaddr, tte_data;
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unsigned long hv_err;
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int i;
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hdesc = kzalloc(sizeof(*hdesc) +
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(sizeof(struct hvtramp_mapping) *
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num_kernel_image_mappings - 1),
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GFP_KERNEL);
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if (!hdesc) {
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printk(KERN_ERR "ldom_startcpu_cpuid: Cannot allocate "
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"hvtramp_descr.\n");
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return;
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}
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*descrp = hdesc;
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hdesc->cpu = cpu;
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hdesc->num_mappings = num_kernel_image_mappings;
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tb = &trap_block[cpu];
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hdesc->fault_info_va = (unsigned long) &tb->fault_info;
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hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info);
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hdesc->thread_reg = thread_reg;
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tte_vaddr = (unsigned long) KERNBASE;
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tte_data = kern_locked_tte_data;
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for (i = 0; i < hdesc->num_mappings; i++) {
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hdesc->maps[i].vaddr = tte_vaddr;
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hdesc->maps[i].tte = tte_data;
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tte_vaddr += 0x400000;
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tte_data += 0x400000;
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}
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trampoline_ra = kimage_addr_to_ra(hv_cpu_startup);
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hv_err = sun4v_cpu_start(cpu, trampoline_ra,
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kimage_addr_to_ra(&sparc64_ttable_tl0),
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__pa(hdesc));
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if (hv_err)
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printk(KERN_ERR "ldom_startcpu_cpuid: sun4v_cpu_start() "
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"gives error %lu\n", hv_err);
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}
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#endif
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extern unsigned long sparc64_cpu_startup;
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/* The OBP cpu startup callback truncates the 3rd arg cookie to
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* 32-bits (I think) so to be safe we have it read the pointer
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* contained here so we work on >4GB machines. -DaveM
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*/
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static struct thread_info *cpu_new_thread = NULL;
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static int smp_boot_one_cpu(unsigned int cpu, struct task_struct *idle)
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{
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unsigned long entry =
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(unsigned long)(&sparc64_cpu_startup);
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unsigned long cookie =
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(unsigned long)(&cpu_new_thread);
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void *descr = NULL;
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int timeout, ret;
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callin_flag = 0;
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cpu_new_thread = task_thread_info(idle);
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if (tlb_type == hypervisor) {
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#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
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if (ldom_domaining_enabled)
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ldom_startcpu_cpuid(cpu,
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(unsigned long) cpu_new_thread,
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&descr);
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else
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#endif
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prom_startcpu_cpuid(cpu, entry, cookie);
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} else {
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struct device_node *dp = of_find_node_by_cpuid(cpu);
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prom_startcpu(dp->phandle, entry, cookie);
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}
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for (timeout = 0; timeout < 50000; timeout++) {
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if (callin_flag)
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break;
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udelay(100);
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}
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if (callin_flag) {
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ret = 0;
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} else {
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printk("Processor %d is stuck.\n", cpu);
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ret = -ENODEV;
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}
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cpu_new_thread = NULL;
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kfree(descr);
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return ret;
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}
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static void spitfire_xcall_helper(u64 data0, u64 data1, u64 data2, u64 pstate, unsigned long cpu)
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{
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u64 result, target;
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int stuck, tmp;
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if (this_is_starfire) {
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/* map to real upaid */
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cpu = (((cpu & 0x3c) << 1) |
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((cpu & 0x40) >> 4) |
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(cpu & 0x3));
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}
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target = (cpu << 14) | 0x70;
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again:
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/* Ok, this is the real Spitfire Errata #54.
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* One must read back from a UDB internal register
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* after writes to the UDB interrupt dispatch, but
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* before the membar Sync for that write.
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* So we use the high UDB control register (ASI 0x7f,
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* ADDR 0x20) for the dummy read. -DaveM
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*/
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tmp = 0x40;
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__asm__ __volatile__(
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"wrpr %1, %2, %%pstate\n\t"
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"stxa %4, [%0] %3\n\t"
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"stxa %5, [%0+%8] %3\n\t"
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"add %0, %8, %0\n\t"
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"stxa %6, [%0+%8] %3\n\t"
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"membar #Sync\n\t"
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"stxa %%g0, [%7] %3\n\t"
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"membar #Sync\n\t"
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"mov 0x20, %%g1\n\t"
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"ldxa [%%g1] 0x7f, %%g0\n\t"
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"membar #Sync"
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: "=r" (tmp)
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: "r" (pstate), "i" (PSTATE_IE), "i" (ASI_INTR_W),
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"r" (data0), "r" (data1), "r" (data2), "r" (target),
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"r" (0x10), "0" (tmp)
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: "g1");
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/* NOTE: PSTATE_IE is still clear. */
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stuck = 100000;
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do {
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__asm__ __volatile__("ldxa [%%g0] %1, %0"
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: "=r" (result)
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: "i" (ASI_INTR_DISPATCH_STAT));
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if (result == 0) {
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__asm__ __volatile__("wrpr %0, 0x0, %%pstate"
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: : "r" (pstate));
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return;
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}
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stuck -= 1;
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if (stuck == 0)
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break;
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} while (result & 0x1);
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__asm__ __volatile__("wrpr %0, 0x0, %%pstate"
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: : "r" (pstate));
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if (stuck == 0) {
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printk("CPU[%d]: mondo stuckage result[%016llx]\n",
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smp_processor_id(), result);
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} else {
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udelay(2);
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goto again;
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}
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}
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|
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static void spitfire_xcall_deliver(struct trap_per_cpu *tb, int cnt)
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{
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u64 *mondo, data0, data1, data2;
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u16 *cpu_list;
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u64 pstate;
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int i;
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__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
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cpu_list = __va(tb->cpu_list_pa);
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mondo = __va(tb->cpu_mondo_block_pa);
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data0 = mondo[0];
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data1 = mondo[1];
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data2 = mondo[2];
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for (i = 0; i < cnt; i++)
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spitfire_xcall_helper(data0, data1, data2, pstate, cpu_list[i]);
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}
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/* Cheetah now allows to send the whole 64-bytes of data in the interrupt
|
|
* packet, but we have no use for that. However we do take advantage of
|
|
* the new pipelining feature (ie. dispatch to multiple cpus simultaneously).
|
|
*/
|
|
static void cheetah_xcall_deliver(struct trap_per_cpu *tb, int cnt)
|
|
{
|
|
int nack_busy_id, is_jbus, need_more;
|
|
u64 *mondo, pstate, ver, busy_mask;
|
|
u16 *cpu_list;
|
|
|
|
cpu_list = __va(tb->cpu_list_pa);
|
|
mondo = __va(tb->cpu_mondo_block_pa);
|
|
|
|
/* Unfortunately, someone at Sun had the brilliant idea to make the
|
|
* busy/nack fields hard-coded by ITID number for this Ultra-III
|
|
* derivative processor.
|
|
*/
|
|
__asm__ ("rdpr %%ver, %0" : "=r" (ver));
|
|
is_jbus = ((ver >> 32) == __JALAPENO_ID ||
|
|
(ver >> 32) == __SERRANO_ID);
|
|
|
|
__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
|
|
|
|
retry:
|
|
need_more = 0;
|
|
__asm__ __volatile__("wrpr %0, %1, %%pstate\n\t"
|
|
: : "r" (pstate), "i" (PSTATE_IE));
|
|
|
|
/* Setup the dispatch data registers. */
|
|
__asm__ __volatile__("stxa %0, [%3] %6\n\t"
|
|
"stxa %1, [%4] %6\n\t"
|
|
"stxa %2, [%5] %6\n\t"
|
|
"membar #Sync\n\t"
|
|
: /* no outputs */
|
|
: "r" (mondo[0]), "r" (mondo[1]), "r" (mondo[2]),
|
|
"r" (0x40), "r" (0x50), "r" (0x60),
|
|
"i" (ASI_INTR_W));
|
|
|
|
nack_busy_id = 0;
|
|
busy_mask = 0;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < cnt; i++) {
|
|
u64 target, nr;
|
|
|
|
nr = cpu_list[i];
|
|
if (nr == 0xffff)
|
|
continue;
|
|
|
|
target = (nr << 14) | 0x70;
|
|
if (is_jbus) {
|
|
busy_mask |= (0x1UL << (nr * 2));
|
|
} else {
|
|
target |= (nack_busy_id << 24);
|
|
busy_mask |= (0x1UL <<
|
|
(nack_busy_id * 2));
|
|
}
|
|
__asm__ __volatile__(
|
|
"stxa %%g0, [%0] %1\n\t"
|
|
"membar #Sync\n\t"
|
|
: /* no outputs */
|
|
: "r" (target), "i" (ASI_INTR_W));
|
|
nack_busy_id++;
|
|
if (nack_busy_id == 32) {
|
|
need_more = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Now, poll for completion. */
|
|
{
|
|
u64 dispatch_stat, nack_mask;
|
|
long stuck;
|
|
|
|
stuck = 100000 * nack_busy_id;
|
|
nack_mask = busy_mask << 1;
|
|
do {
|
|
__asm__ __volatile__("ldxa [%%g0] %1, %0"
|
|
: "=r" (dispatch_stat)
|
|
: "i" (ASI_INTR_DISPATCH_STAT));
|
|
if (!(dispatch_stat & (busy_mask | nack_mask))) {
|
|
__asm__ __volatile__("wrpr %0, 0x0, %%pstate"
|
|
: : "r" (pstate));
|
|
if (unlikely(need_more)) {
|
|
int i, this_cnt = 0;
|
|
for (i = 0; i < cnt; i++) {
|
|
if (cpu_list[i] == 0xffff)
|
|
continue;
|
|
cpu_list[i] = 0xffff;
|
|
this_cnt++;
|
|
if (this_cnt == 32)
|
|
break;
|
|
}
|
|
goto retry;
|
|
}
|
|
return;
|
|
}
|
|
if (!--stuck)
|
|
break;
|
|
} while (dispatch_stat & busy_mask);
|
|
|
|
__asm__ __volatile__("wrpr %0, 0x0, %%pstate"
|
|
: : "r" (pstate));
|
|
|
|
if (dispatch_stat & busy_mask) {
|
|
/* Busy bits will not clear, continue instead
|
|
* of freezing up on this cpu.
|
|
*/
|
|
printk("CPU[%d]: mondo stuckage result[%016llx]\n",
|
|
smp_processor_id(), dispatch_stat);
|
|
} else {
|
|
int i, this_busy_nack = 0;
|
|
|
|
/* Delay some random time with interrupts enabled
|
|
* to prevent deadlock.
|
|
*/
|
|
udelay(2 * nack_busy_id);
|
|
|
|
/* Clear out the mask bits for cpus which did not
|
|
* NACK us.
|
|
*/
|
|
for (i = 0; i < cnt; i++) {
|
|
u64 check_mask, nr;
|
|
|
|
nr = cpu_list[i];
|
|
if (nr == 0xffff)
|
|
continue;
|
|
|
|
if (is_jbus)
|
|
check_mask = (0x2UL << (2*nr));
|
|
else
|
|
check_mask = (0x2UL <<
|
|
this_busy_nack);
|
|
if ((dispatch_stat & check_mask) == 0)
|
|
cpu_list[i] = 0xffff;
|
|
this_busy_nack += 2;
|
|
if (this_busy_nack == 64)
|
|
break;
|
|
}
|
|
|
|
goto retry;
|
|
}
|
|
}
|
|
}
|
|
|
|
#define CPU_MONDO_COUNTER(cpuid) (cpu_mondo_counter[cpuid])
|
|
#define MONDO_USEC_WAIT_MIN 2
|
|
#define MONDO_USEC_WAIT_MAX 100
|
|
#define MONDO_RETRY_LIMIT 500000
|
|
|
|
/* Multi-cpu list version.
|
|
*
|
|
* Deliver xcalls to 'cnt' number of cpus in 'cpu_list'.
|
|
* Sometimes not all cpus receive the mondo, requiring us to re-send
|
|
* the mondo until all cpus have received, or cpus are truly stuck
|
|
* unable to receive mondo, and we timeout.
|
|
* Occasionally a target cpu strand is borrowed briefly by hypervisor to
|
|
* perform guest service, such as PCIe error handling. Consider the
|
|
* service time, 1 second overall wait is reasonable for 1 cpu.
|
|
* Here two in-between mondo check wait time are defined: 2 usec for
|
|
* single cpu quick turn around and up to 100usec for large cpu count.
|
|
* Deliver mondo to large number of cpus could take longer, we adjusts
|
|
* the retry count as long as target cpus are making forward progress.
|
|
*/
|
|
static void hypervisor_xcall_deliver(struct trap_per_cpu *tb, int cnt)
|
|
{
|
|
int this_cpu, tot_cpus, prev_sent, i, rem;
|
|
int usec_wait, retries, tot_retries;
|
|
u16 first_cpu = 0xffff;
|
|
unsigned long xc_rcvd = 0;
|
|
unsigned long status;
|
|
int ecpuerror_id = 0;
|
|
int enocpu_id = 0;
|
|
u16 *cpu_list;
|
|
u16 cpu;
|
|
|
|
this_cpu = smp_processor_id();
|
|
cpu_list = __va(tb->cpu_list_pa);
|
|
usec_wait = cnt * MONDO_USEC_WAIT_MIN;
|
|
if (usec_wait > MONDO_USEC_WAIT_MAX)
|
|
usec_wait = MONDO_USEC_WAIT_MAX;
|
|
retries = tot_retries = 0;
|
|
tot_cpus = cnt;
|
|
prev_sent = 0;
|
|
|
|
do {
|
|
int n_sent, mondo_delivered, target_cpu_busy;
|
|
|
|
status = sun4v_cpu_mondo_send(cnt,
|
|
tb->cpu_list_pa,
|
|
tb->cpu_mondo_block_pa);
|
|
|
|
/* HV_EOK means all cpus received the xcall, we're done. */
|
|
if (likely(status == HV_EOK))
|
|
goto xcall_done;
|
|
|
|
/* If not these non-fatal errors, panic */
|
|
if (unlikely((status != HV_EWOULDBLOCK) &&
|
|
(status != HV_ECPUERROR) &&
|
|
(status != HV_ENOCPU)))
|
|
goto fatal_errors;
|
|
|
|
/* First, see if we made any forward progress.
|
|
*
|
|
* Go through the cpu_list, count the target cpus that have
|
|
* received our mondo (n_sent), and those that did not (rem).
|
|
* Re-pack cpu_list with the cpus remain to be retried in the
|
|
* front - this simplifies tracking the truly stalled cpus.
|
|
*
|
|
* The hypervisor indicates successful sends by setting
|
|
* cpu list entries to the value 0xffff.
|
|
*
|
|
* EWOULDBLOCK means some target cpus did not receive the
|
|
* mondo and retry usually helps.
|
|
*
|
|
* ECPUERROR means at least one target cpu is in error state,
|
|
* it's usually safe to skip the faulty cpu and retry.
|
|
*
|
|
* ENOCPU means one of the target cpu doesn't belong to the
|
|
* domain, perhaps offlined which is unexpected, but not
|
|
* fatal and it's okay to skip the offlined cpu.
|
|
*/
|
|
rem = 0;
|
|
n_sent = 0;
|
|
for (i = 0; i < cnt; i++) {
|
|
cpu = cpu_list[i];
|
|
if (likely(cpu == 0xffff)) {
|
|
n_sent++;
|
|
} else if ((status == HV_ECPUERROR) &&
|
|
(sun4v_cpu_state(cpu) == HV_CPU_STATE_ERROR)) {
|
|
ecpuerror_id = cpu + 1;
|
|
} else if (status == HV_ENOCPU && !cpu_online(cpu)) {
|
|
enocpu_id = cpu + 1;
|
|
} else {
|
|
cpu_list[rem++] = cpu;
|
|
}
|
|
}
|
|
|
|
/* No cpu remained, we're done. */
|
|
if (rem == 0)
|
|
break;
|
|
|
|
/* Otherwise, update the cpu count for retry. */
|
|
cnt = rem;
|
|
|
|
/* Record the overall number of mondos received by the
|
|
* first of the remaining cpus.
|
|
*/
|
|
if (first_cpu != cpu_list[0]) {
|
|
first_cpu = cpu_list[0];
|
|
xc_rcvd = CPU_MONDO_COUNTER(first_cpu);
|
|
}
|
|
|
|
/* Was any mondo delivered successfully? */
|
|
mondo_delivered = (n_sent > prev_sent);
|
|
prev_sent = n_sent;
|
|
|
|
/* or, was any target cpu busy processing other mondos? */
|
|
target_cpu_busy = (xc_rcvd < CPU_MONDO_COUNTER(first_cpu));
|
|
xc_rcvd = CPU_MONDO_COUNTER(first_cpu);
|
|
|
|
/* Retry count is for no progress. If we're making progress,
|
|
* reset the retry count.
|
|
*/
|
|
if (likely(mondo_delivered || target_cpu_busy)) {
|
|
tot_retries += retries;
|
|
retries = 0;
|
|
} else if (unlikely(retries > MONDO_RETRY_LIMIT)) {
|
|
goto fatal_mondo_timeout;
|
|
}
|
|
|
|
/* Delay a little bit to let other cpus catch up on
|
|
* their cpu mondo queue work.
|
|
*/
|
|
if (!mondo_delivered)
|
|
udelay(usec_wait);
|
|
|
|
retries++;
|
|
} while (1);
|
|
|
|
xcall_done:
|
|
if (unlikely(ecpuerror_id > 0)) {
|
|
pr_crit("CPU[%d]: SUN4V mondo cpu error, target cpu(%d) was in error state\n",
|
|
this_cpu, ecpuerror_id - 1);
|
|
} else if (unlikely(enocpu_id > 0)) {
|
|
pr_crit("CPU[%d]: SUN4V mondo cpu error, target cpu(%d) does not belong to the domain\n",
|
|
this_cpu, enocpu_id - 1);
|
|
}
|
|
return;
|
|
|
|
fatal_errors:
|
|
/* fatal errors include bad alignment, etc */
|
|
pr_crit("CPU[%d]: Args were cnt(%d) cpulist_pa(%lx) mondo_block_pa(%lx)\n",
|
|
this_cpu, tot_cpus, tb->cpu_list_pa, tb->cpu_mondo_block_pa);
|
|
panic("Unexpected SUN4V mondo error %lu\n", status);
|
|
|
|
fatal_mondo_timeout:
|
|
/* some cpus being non-responsive to the cpu mondo */
|
|
pr_crit("CPU[%d]: SUN4V mondo timeout, cpu(%d) made no forward progress after %d retries. Total target cpus(%d).\n",
|
|
this_cpu, first_cpu, (tot_retries + retries), tot_cpus);
|
|
panic("SUN4V mondo timeout panic\n");
|
|
}
|
|
|
|
static void (*xcall_deliver_impl)(struct trap_per_cpu *, int);
|
|
|
|
static void xcall_deliver(u64 data0, u64 data1, u64 data2, const cpumask_t *mask)
|
|
{
|
|
struct trap_per_cpu *tb;
|
|
int this_cpu, i, cnt;
|
|
unsigned long flags;
|
|
u16 *cpu_list;
|
|
u64 *mondo;
|
|
|
|
/* We have to do this whole thing with interrupts fully disabled.
|
|
* Otherwise if we send an xcall from interrupt context it will
|
|
* corrupt both our mondo block and cpu list state.
|
|
*
|
|
* One consequence of this is that we cannot use timeout mechanisms
|
|
* that depend upon interrupts being delivered locally. So, for
|
|
* example, we cannot sample jiffies and expect it to advance.
|
|
*
|
|
* Fortunately, udelay() uses %stick/%tick so we can use that.
|
|
*/
|
|
local_irq_save(flags);
|
|
|
|
this_cpu = smp_processor_id();
|
|
tb = &trap_block[this_cpu];
|
|
|
|
mondo = __va(tb->cpu_mondo_block_pa);
|
|
mondo[0] = data0;
|
|
mondo[1] = data1;
|
|
mondo[2] = data2;
|
|
wmb();
|
|
|
|
cpu_list = __va(tb->cpu_list_pa);
|
|
|
|
/* Setup the initial cpu list. */
|
|
cnt = 0;
|
|
for_each_cpu(i, mask) {
|
|
if (i == this_cpu || !cpu_online(i))
|
|
continue;
|
|
cpu_list[cnt++] = i;
|
|
}
|
|
|
|
if (cnt)
|
|
xcall_deliver_impl(tb, cnt);
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* Send cross call to all processors mentioned in MASK_P
|
|
* except self. Really, there are only two cases currently,
|
|
* "cpu_online_mask" and "mm_cpumask(mm)".
|
|
*/
|
|
static void smp_cross_call_masked(unsigned long *func, u32 ctx, u64 data1, u64 data2, const cpumask_t *mask)
|
|
{
|
|
u64 data0 = (((u64)ctx)<<32 | (((u64)func) & 0xffffffff));
|
|
|
|
xcall_deliver(data0, data1, data2, mask);
|
|
}
|
|
|
|
/* Send cross call to all processors except self. */
|
|
static void smp_cross_call(unsigned long *func, u32 ctx, u64 data1, u64 data2)
|
|
{
|
|
smp_cross_call_masked(func, ctx, data1, data2, cpu_online_mask);
|
|
}
|
|
|
|
extern unsigned long xcall_sync_tick;
|
|
|
|
static void smp_start_sync_tick_client(int cpu)
|
|
{
|
|
xcall_deliver((u64) &xcall_sync_tick, 0, 0,
|
|
cpumask_of(cpu));
|
|
}
|
|
|
|
extern unsigned long xcall_call_function;
|
|
|
|
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
|
|
{
|
|
xcall_deliver((u64) &xcall_call_function, 0, 0, mask);
|
|
}
|
|
|
|
extern unsigned long xcall_call_function_single;
|
|
|
|
void arch_send_call_function_single_ipi(int cpu)
|
|
{
|
|
xcall_deliver((u64) &xcall_call_function_single, 0, 0,
|
|
cpumask_of(cpu));
|
|
}
|
|
|
|
void __irq_entry smp_call_function_client(int irq, struct pt_regs *regs)
|
|
{
|
|
clear_softint(1 << irq);
|
|
irq_enter();
|
|
generic_smp_call_function_interrupt();
|
|
irq_exit();
|
|
}
|
|
|
|
void __irq_entry smp_call_function_single_client(int irq, struct pt_regs *regs)
|
|
{
|
|
clear_softint(1 << irq);
|
|
irq_enter();
|
|
generic_smp_call_function_single_interrupt();
|
|
irq_exit();
|
|
}
|
|
|
|
static void tsb_sync(void *info)
|
|
{
|
|
struct trap_per_cpu *tp = &trap_block[raw_smp_processor_id()];
|
|
struct mm_struct *mm = info;
|
|
|
|
/* It is not valid to test "current->active_mm == mm" here.
|
|
*
|
|
* The value of "current" is not changed atomically with
|
|
* switch_mm(). But that's OK, we just need to check the
|
|
* current cpu's trap block PGD physical address.
|
|
*/
|
|
if (tp->pgd_paddr == __pa(mm->pgd))
|
|
tsb_context_switch(mm);
|
|
}
|
|
|
|
void smp_tsb_sync(struct mm_struct *mm)
|
|
{
|
|
smp_call_function_many(mm_cpumask(mm), tsb_sync, mm, 1);
|
|
}
|
|
|
|
extern unsigned long xcall_flush_tlb_mm;
|
|
extern unsigned long xcall_flush_tlb_page;
|
|
extern unsigned long xcall_flush_tlb_kernel_range;
|
|
extern unsigned long xcall_fetch_glob_regs;
|
|
extern unsigned long xcall_fetch_glob_pmu;
|
|
extern unsigned long xcall_fetch_glob_pmu_n4;
|
|
extern unsigned long xcall_receive_signal;
|
|
extern unsigned long xcall_new_mmu_context_version;
|
|
#ifdef CONFIG_KGDB
|
|
extern unsigned long xcall_kgdb_capture;
|
|
#endif
|
|
|
|
#ifdef DCACHE_ALIASING_POSSIBLE
|
|
extern unsigned long xcall_flush_dcache_page_cheetah;
|
|
#endif
|
|
extern unsigned long xcall_flush_dcache_page_spitfire;
|
|
|
|
static inline void __local_flush_dcache_page(struct page *page)
|
|
{
|
|
#ifdef DCACHE_ALIASING_POSSIBLE
|
|
__flush_dcache_page(page_address(page),
|
|
((tlb_type == spitfire) &&
|
|
page_mapping(page) != NULL));
|
|
#else
|
|
if (page_mapping(page) != NULL &&
|
|
tlb_type == spitfire)
|
|
__flush_icache_page(__pa(page_address(page)));
|
|
#endif
|
|
}
|
|
|
|
void smp_flush_dcache_page_impl(struct page *page, int cpu)
|
|
{
|
|
int this_cpu;
|
|
|
|
if (tlb_type == hypervisor)
|
|
return;
|
|
|
|
#ifdef CONFIG_DEBUG_DCFLUSH
|
|
atomic_inc(&dcpage_flushes);
|
|
#endif
|
|
|
|
this_cpu = get_cpu();
|
|
|
|
if (cpu == this_cpu) {
|
|
__local_flush_dcache_page(page);
|
|
} else if (cpu_online(cpu)) {
|
|
void *pg_addr = page_address(page);
|
|
u64 data0 = 0;
|
|
|
|
if (tlb_type == spitfire) {
|
|
data0 = ((u64)&xcall_flush_dcache_page_spitfire);
|
|
if (page_mapping(page) != NULL)
|
|
data0 |= ((u64)1 << 32);
|
|
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
|
|
#ifdef DCACHE_ALIASING_POSSIBLE
|
|
data0 = ((u64)&xcall_flush_dcache_page_cheetah);
|
|
#endif
|
|
}
|
|
if (data0) {
|
|
xcall_deliver(data0, __pa(pg_addr),
|
|
(u64) pg_addr, cpumask_of(cpu));
|
|
#ifdef CONFIG_DEBUG_DCFLUSH
|
|
atomic_inc(&dcpage_flushes_xcall);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
put_cpu();
|
|
}
|
|
|
|
void flush_dcache_page_all(struct mm_struct *mm, struct page *page)
|
|
{
|
|
void *pg_addr;
|
|
u64 data0;
|
|
|
|
if (tlb_type == hypervisor)
|
|
return;
|
|
|
|
preempt_disable();
|
|
|
|
#ifdef CONFIG_DEBUG_DCFLUSH
|
|
atomic_inc(&dcpage_flushes);
|
|
#endif
|
|
data0 = 0;
|
|
pg_addr = page_address(page);
|
|
if (tlb_type == spitfire) {
|
|
data0 = ((u64)&xcall_flush_dcache_page_spitfire);
|
|
if (page_mapping(page) != NULL)
|
|
data0 |= ((u64)1 << 32);
|
|
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
|
|
#ifdef DCACHE_ALIASING_POSSIBLE
|
|
data0 = ((u64)&xcall_flush_dcache_page_cheetah);
|
|
#endif
|
|
}
|
|
if (data0) {
|
|
xcall_deliver(data0, __pa(pg_addr),
|
|
(u64) pg_addr, cpu_online_mask);
|
|
#ifdef CONFIG_DEBUG_DCFLUSH
|
|
atomic_inc(&dcpage_flushes_xcall);
|
|
#endif
|
|
}
|
|
__local_flush_dcache_page(page);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
#ifdef CONFIG_KGDB
|
|
void kgdb_roundup_cpus(unsigned long flags)
|
|
{
|
|
smp_cross_call(&xcall_kgdb_capture, 0, 0, 0);
|
|
}
|
|
#endif
|
|
|
|
void smp_fetch_global_regs(void)
|
|
{
|
|
smp_cross_call(&xcall_fetch_glob_regs, 0, 0, 0);
|
|
}
|
|
|
|
void smp_fetch_global_pmu(void)
|
|
{
|
|
if (tlb_type == hypervisor &&
|
|
sun4v_chip_type >= SUN4V_CHIP_NIAGARA4)
|
|
smp_cross_call(&xcall_fetch_glob_pmu_n4, 0, 0, 0);
|
|
else
|
|
smp_cross_call(&xcall_fetch_glob_pmu, 0, 0, 0);
|
|
}
|
|
|
|
/* We know that the window frames of the user have been flushed
|
|
* to the stack before we get here because all callers of us
|
|
* are flush_tlb_*() routines, and these run after flush_cache_*()
|
|
* which performs the flushw.
|
|
*
|
|
* The SMP TLB coherency scheme we use works as follows:
|
|
*
|
|
* 1) mm->cpu_vm_mask is a bit mask of which cpus an address
|
|
* space has (potentially) executed on, this is the heuristic
|
|
* we use to avoid doing cross calls.
|
|
*
|
|
* Also, for flushing from kswapd and also for clones, we
|
|
* use cpu_vm_mask as the list of cpus to make run the TLB.
|
|
*
|
|
* 2) TLB context numbers are shared globally across all processors
|
|
* in the system, this allows us to play several games to avoid
|
|
* cross calls.
|
|
*
|
|
* One invariant is that when a cpu switches to a process, and
|
|
* that processes tsk->active_mm->cpu_vm_mask does not have the
|
|
* current cpu's bit set, that tlb context is flushed locally.
|
|
*
|
|
* If the address space is non-shared (ie. mm->count == 1) we avoid
|
|
* cross calls when we want to flush the currently running process's
|
|
* tlb state. This is done by clearing all cpu bits except the current
|
|
* processor's in current->mm->cpu_vm_mask and performing the
|
|
* flush locally only. This will force any subsequent cpus which run
|
|
* this task to flush the context from the local tlb if the process
|
|
* migrates to another cpu (again).
|
|
*
|
|
* 3) For shared address spaces (threads) and swapping we bite the
|
|
* bullet for most cases and perform the cross call (but only to
|
|
* the cpus listed in cpu_vm_mask).
|
|
*
|
|
* The performance gain from "optimizing" away the cross call for threads is
|
|
* questionable (in theory the big win for threads is the massive sharing of
|
|
* address space state across processors).
|
|
*/
|
|
|
|
/* This currently is only used by the hugetlb arch pre-fault
|
|
* hook on UltraSPARC-III+ and later when changing the pagesize
|
|
* bits of the context register for an address space.
|
|
*/
|
|
void smp_flush_tlb_mm(struct mm_struct *mm)
|
|
{
|
|
u32 ctx = CTX_HWBITS(mm->context);
|
|
int cpu = get_cpu();
|
|
|
|
if (atomic_read(&mm->mm_users) == 1) {
|
|
cpumask_copy(mm_cpumask(mm), cpumask_of(cpu));
|
|
goto local_flush_and_out;
|
|
}
|
|
|
|
smp_cross_call_masked(&xcall_flush_tlb_mm,
|
|
ctx, 0, 0,
|
|
mm_cpumask(mm));
|
|
|
|
local_flush_and_out:
|
|
__flush_tlb_mm(ctx, SECONDARY_CONTEXT);
|
|
|
|
put_cpu();
|
|
}
|
|
|
|
struct tlb_pending_info {
|
|
unsigned long ctx;
|
|
unsigned long nr;
|
|
unsigned long *vaddrs;
|
|
};
|
|
|
|
static void tlb_pending_func(void *info)
|
|
{
|
|
struct tlb_pending_info *t = info;
|
|
|
|
__flush_tlb_pending(t->ctx, t->nr, t->vaddrs);
|
|
}
|
|
|
|
void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs)
|
|
{
|
|
u32 ctx = CTX_HWBITS(mm->context);
|
|
struct tlb_pending_info info;
|
|
int cpu = get_cpu();
|
|
|
|
info.ctx = ctx;
|
|
info.nr = nr;
|
|
info.vaddrs = vaddrs;
|
|
|
|
if (mm == current->mm && atomic_read(&mm->mm_users) == 1)
|
|
cpumask_copy(mm_cpumask(mm), cpumask_of(cpu));
|
|
else
|
|
smp_call_function_many(mm_cpumask(mm), tlb_pending_func,
|
|
&info, 1);
|
|
|
|
__flush_tlb_pending(ctx, nr, vaddrs);
|
|
|
|
put_cpu();
|
|
}
|
|
|
|
void smp_flush_tlb_page(struct mm_struct *mm, unsigned long vaddr)
|
|
{
|
|
unsigned long context = CTX_HWBITS(mm->context);
|
|
int cpu = get_cpu();
|
|
|
|
if (mm == current->mm && atomic_read(&mm->mm_users) == 1)
|
|
cpumask_copy(mm_cpumask(mm), cpumask_of(cpu));
|
|
else
|
|
smp_cross_call_masked(&xcall_flush_tlb_page,
|
|
context, vaddr, 0,
|
|
mm_cpumask(mm));
|
|
__flush_tlb_page(context, vaddr);
|
|
|
|
put_cpu();
|
|
}
|
|
|
|
void smp_flush_tlb_kernel_range(unsigned long start, unsigned long end)
|
|
{
|
|
start &= PAGE_MASK;
|
|
end = PAGE_ALIGN(end);
|
|
if (start != end) {
|
|
smp_cross_call(&xcall_flush_tlb_kernel_range,
|
|
0, start, end);
|
|
|
|
__flush_tlb_kernel_range(start, end);
|
|
}
|
|
}
|
|
|
|
/* CPU capture. */
|
|
/* #define CAPTURE_DEBUG */
|
|
extern unsigned long xcall_capture;
|
|
|
|
static atomic_t smp_capture_depth = ATOMIC_INIT(0);
|
|
static atomic_t smp_capture_registry = ATOMIC_INIT(0);
|
|
static unsigned long penguins_are_doing_time;
|
|
|
|
void smp_capture(void)
|
|
{
|
|
int result = atomic_add_return(1, &smp_capture_depth);
|
|
|
|
if (result == 1) {
|
|
int ncpus = num_online_cpus();
|
|
|
|
#ifdef CAPTURE_DEBUG
|
|
printk("CPU[%d]: Sending penguins to jail...",
|
|
smp_processor_id());
|
|
#endif
|
|
penguins_are_doing_time = 1;
|
|
atomic_inc(&smp_capture_registry);
|
|
smp_cross_call(&xcall_capture, 0, 0, 0);
|
|
while (atomic_read(&smp_capture_registry) != ncpus)
|
|
rmb();
|
|
#ifdef CAPTURE_DEBUG
|
|
printk("done\n");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void smp_release(void)
|
|
{
|
|
if (atomic_dec_and_test(&smp_capture_depth)) {
|
|
#ifdef CAPTURE_DEBUG
|
|
printk("CPU[%d]: Giving pardon to "
|
|
"imprisoned penguins\n",
|
|
smp_processor_id());
|
|
#endif
|
|
penguins_are_doing_time = 0;
|
|
membar_safe("#StoreLoad");
|
|
atomic_dec(&smp_capture_registry);
|
|
}
|
|
}
|
|
|
|
/* Imprisoned penguins run with %pil == PIL_NORMAL_MAX, but PSTATE_IE
|
|
* set, so they can service tlb flush xcalls...
|
|
*/
|
|
extern void prom_world(int);
|
|
|
|
void __irq_entry smp_penguin_jailcell(int irq, struct pt_regs *regs)
|
|
{
|
|
clear_softint(1 << irq);
|
|
|
|
preempt_disable();
|
|
|
|
__asm__ __volatile__("flushw");
|
|
prom_world(1);
|
|
atomic_inc(&smp_capture_registry);
|
|
membar_safe("#StoreLoad");
|
|
while (penguins_are_doing_time)
|
|
rmb();
|
|
atomic_dec(&smp_capture_registry);
|
|
prom_world(0);
|
|
|
|
preempt_enable();
|
|
}
|
|
|
|
/* /proc/profile writes can call this, don't __init it please. */
|
|
int setup_profiling_timer(unsigned int multiplier)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
void __init smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
}
|
|
|
|
void smp_prepare_boot_cpu(void)
|
|
{
|
|
}
|
|
|
|
void __init smp_setup_processor_id(void)
|
|
{
|
|
if (tlb_type == spitfire)
|
|
xcall_deliver_impl = spitfire_xcall_deliver;
|
|
else if (tlb_type == cheetah || tlb_type == cheetah_plus)
|
|
xcall_deliver_impl = cheetah_xcall_deliver;
|
|
else
|
|
xcall_deliver_impl = hypervisor_xcall_deliver;
|
|
}
|
|
|
|
void __init smp_fill_in_cpu_possible_map(void)
|
|
{
|
|
int possible_cpus = num_possible_cpus();
|
|
int i;
|
|
|
|
if (possible_cpus > nr_cpu_ids)
|
|
possible_cpus = nr_cpu_ids;
|
|
|
|
for (i = 0; i < possible_cpus; i++)
|
|
set_cpu_possible(i, true);
|
|
for (; i < NR_CPUS; i++)
|
|
set_cpu_possible(i, false);
|
|
}
|
|
|
|
void smp_fill_in_sib_core_maps(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
for_each_present_cpu(i) {
|
|
unsigned int j;
|
|
|
|
cpumask_clear(&cpu_core_map[i]);
|
|
if (cpu_data(i).core_id == 0) {
|
|
cpumask_set_cpu(i, &cpu_core_map[i]);
|
|
continue;
|
|
}
|
|
|
|
for_each_present_cpu(j) {
|
|
if (cpu_data(i).core_id ==
|
|
cpu_data(j).core_id)
|
|
cpumask_set_cpu(j, &cpu_core_map[i]);
|
|
}
|
|
}
|
|
|
|
for_each_present_cpu(i) {
|
|
unsigned int j;
|
|
|
|
for_each_present_cpu(j) {
|
|
if (cpu_data(i).max_cache_id ==
|
|
cpu_data(j).max_cache_id)
|
|
cpumask_set_cpu(j, &cpu_core_sib_cache_map[i]);
|
|
|
|
if (cpu_data(i).sock_id == cpu_data(j).sock_id)
|
|
cpumask_set_cpu(j, &cpu_core_sib_map[i]);
|
|
}
|
|
}
|
|
|
|
for_each_present_cpu(i) {
|
|
unsigned int j;
|
|
|
|
cpumask_clear(&per_cpu(cpu_sibling_map, i));
|
|
if (cpu_data(i).proc_id == -1) {
|
|
cpumask_set_cpu(i, &per_cpu(cpu_sibling_map, i));
|
|
continue;
|
|
}
|
|
|
|
for_each_present_cpu(j) {
|
|
if (cpu_data(i).proc_id ==
|
|
cpu_data(j).proc_id)
|
|
cpumask_set_cpu(j, &per_cpu(cpu_sibling_map, i));
|
|
}
|
|
}
|
|
}
|
|
|
|
int __cpu_up(unsigned int cpu, struct task_struct *tidle)
|
|
{
|
|
int ret = smp_boot_one_cpu(cpu, tidle);
|
|
|
|
if (!ret) {
|
|
cpumask_set_cpu(cpu, &smp_commenced_mask);
|
|
while (!cpu_online(cpu))
|
|
mb();
|
|
if (!cpu_online(cpu)) {
|
|
ret = -ENODEV;
|
|
} else {
|
|
/* On SUN4V, writes to %tick and %stick are
|
|
* not allowed.
|
|
*/
|
|
if (tlb_type != hypervisor)
|
|
smp_synchronize_one_tick(cpu);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
void cpu_play_dead(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
unsigned long pstate;
|
|
|
|
idle_task_exit();
|
|
|
|
if (tlb_type == hypervisor) {
|
|
struct trap_per_cpu *tb = &trap_block[cpu];
|
|
|
|
sun4v_cpu_qconf(HV_CPU_QUEUE_CPU_MONDO,
|
|
tb->cpu_mondo_pa, 0);
|
|
sun4v_cpu_qconf(HV_CPU_QUEUE_DEVICE_MONDO,
|
|
tb->dev_mondo_pa, 0);
|
|
sun4v_cpu_qconf(HV_CPU_QUEUE_RES_ERROR,
|
|
tb->resum_mondo_pa, 0);
|
|
sun4v_cpu_qconf(HV_CPU_QUEUE_NONRES_ERROR,
|
|
tb->nonresum_mondo_pa, 0);
|
|
}
|
|
|
|
cpumask_clear_cpu(cpu, &smp_commenced_mask);
|
|
membar_safe("#Sync");
|
|
|
|
local_irq_disable();
|
|
|
|
__asm__ __volatile__(
|
|
"rdpr %%pstate, %0\n\t"
|
|
"wrpr %0, %1, %%pstate"
|
|
: "=r" (pstate)
|
|
: "i" (PSTATE_IE));
|
|
|
|
while (1)
|
|
barrier();
|
|
}
|
|
|
|
int __cpu_disable(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
cpuinfo_sparc *c;
|
|
int i;
|
|
|
|
for_each_cpu(i, &cpu_core_map[cpu])
|
|
cpumask_clear_cpu(cpu, &cpu_core_map[i]);
|
|
cpumask_clear(&cpu_core_map[cpu]);
|
|
|
|
for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu))
|
|
cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i));
|
|
cpumask_clear(&per_cpu(cpu_sibling_map, cpu));
|
|
|
|
c = &cpu_data(cpu);
|
|
|
|
c->core_id = 0;
|
|
c->proc_id = -1;
|
|
|
|
smp_wmb();
|
|
|
|
/* Make sure no interrupts point to this cpu. */
|
|
fixup_irqs();
|
|
|
|
local_irq_enable();
|
|
mdelay(1);
|
|
local_irq_disable();
|
|
|
|
set_cpu_online(cpu, false);
|
|
|
|
cpu_map_rebuild();
|
|
|
|
return 0;
|
|
}
|
|
|
|
void __cpu_die(unsigned int cpu)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 100; i++) {
|
|
smp_rmb();
|
|
if (!cpumask_test_cpu(cpu, &smp_commenced_mask))
|
|
break;
|
|
msleep(100);
|
|
}
|
|
if (cpumask_test_cpu(cpu, &smp_commenced_mask)) {
|
|
printk(KERN_ERR "CPU %u didn't die...\n", cpu);
|
|
} else {
|
|
#if defined(CONFIG_SUN_LDOMS)
|
|
unsigned long hv_err;
|
|
int limit = 100;
|
|
|
|
do {
|
|
hv_err = sun4v_cpu_stop(cpu);
|
|
if (hv_err == HV_EOK) {
|
|
set_cpu_present(cpu, false);
|
|
break;
|
|
}
|
|
} while (--limit > 0);
|
|
if (limit <= 0) {
|
|
printk(KERN_ERR "sun4v_cpu_stop() fails err=%lu\n",
|
|
hv_err);
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
#endif
|
|
|
|
void __init smp_cpus_done(unsigned int max_cpus)
|
|
{
|
|
}
|
|
|
|
void smp_send_reschedule(int cpu)
|
|
{
|
|
if (cpu == smp_processor_id()) {
|
|
WARN_ON_ONCE(preemptible());
|
|
set_softint(1 << PIL_SMP_RECEIVE_SIGNAL);
|
|
} else {
|
|
xcall_deliver((u64) &xcall_receive_signal,
|
|
0, 0, cpumask_of(cpu));
|
|
}
|
|
}
|
|
|
|
void __irq_entry smp_receive_signal_client(int irq, struct pt_regs *regs)
|
|
{
|
|
clear_softint(1 << irq);
|
|
scheduler_ipi();
|
|
}
|
|
|
|
static void stop_this_cpu(void *dummy)
|
|
{
|
|
set_cpu_online(smp_processor_id(), false);
|
|
prom_stopself();
|
|
}
|
|
|
|
void smp_send_stop(void)
|
|
{
|
|
int cpu;
|
|
|
|
if (tlb_type == hypervisor) {
|
|
int this_cpu = smp_processor_id();
|
|
#ifdef CONFIG_SERIAL_SUNHV
|
|
sunhv_migrate_hvcons_irq(this_cpu);
|
|
#endif
|
|
for_each_online_cpu(cpu) {
|
|
if (cpu == this_cpu)
|
|
continue;
|
|
|
|
set_cpu_online(cpu, false);
|
|
#ifdef CONFIG_SUN_LDOMS
|
|
if (ldom_domaining_enabled) {
|
|
unsigned long hv_err;
|
|
hv_err = sun4v_cpu_stop(cpu);
|
|
if (hv_err)
|
|
printk(KERN_ERR "sun4v_cpu_stop() "
|
|
"failed err=%lu\n", hv_err);
|
|
} else
|
|
#endif
|
|
prom_stopcpu_cpuid(cpu);
|
|
}
|
|
} else
|
|
smp_call_function(stop_this_cpu, NULL, 0);
|
|
}
|
|
|
|
/**
|
|
* pcpu_alloc_bootmem - NUMA friendly alloc_bootmem wrapper for percpu
|
|
* @cpu: cpu to allocate for
|
|
* @size: size allocation in bytes
|
|
* @align: alignment
|
|
*
|
|
* Allocate @size bytes aligned at @align for cpu @cpu. This wrapper
|
|
* does the right thing for NUMA regardless of the current
|
|
* configuration.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to the allocated area on success, NULL on failure.
|
|
*/
|
|
static void * __init pcpu_alloc_bootmem(unsigned int cpu, size_t size,
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size_t align)
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{
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const unsigned long goal = __pa(MAX_DMA_ADDRESS);
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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int node = cpu_to_node(cpu);
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void *ptr;
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|
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if (!node_online(node) || !NODE_DATA(node)) {
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ptr = __alloc_bootmem(size, align, goal);
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pr_info("cpu %d has no node %d or node-local memory\n",
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cpu, node);
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pr_debug("per cpu data for cpu%d %lu bytes at %016lx\n",
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cpu, size, __pa(ptr));
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} else {
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ptr = __alloc_bootmem_node(NODE_DATA(node),
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size, align, goal);
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pr_debug("per cpu data for cpu%d %lu bytes on node%d at "
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"%016lx\n", cpu, size, node, __pa(ptr));
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}
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return ptr;
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#else
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return __alloc_bootmem(size, align, goal);
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#endif
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}
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|
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static void __init pcpu_free_bootmem(void *ptr, size_t size)
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{
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free_bootmem(__pa(ptr), size);
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}
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|
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static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
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|
{
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if (cpu_to_node(from) == cpu_to_node(to))
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return LOCAL_DISTANCE;
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else
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return REMOTE_DISTANCE;
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}
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|
|
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static void __init pcpu_populate_pte(unsigned long addr)
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|
{
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pgd_t *pgd = pgd_offset_k(addr);
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|
pud_t *pud;
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|
pmd_t *pmd;
|
|
|
|
if (pgd_none(*pgd)) {
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|
pud_t *new;
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|
|
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new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
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pgd_populate(&init_mm, pgd, new);
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|
}
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|
|
|
pud = pud_offset(pgd, addr);
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|
if (pud_none(*pud)) {
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|
pmd_t *new;
|
|
|
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new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
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pud_populate(&init_mm, pud, new);
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|
}
|
|
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pmd = pmd_offset(pud, addr);
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|
if (!pmd_present(*pmd)) {
|
|
pte_t *new;
|
|
|
|
new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
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pmd_populate_kernel(&init_mm, pmd, new);
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|
}
|
|
}
|
|
|
|
void __init setup_per_cpu_areas(void)
|
|
{
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|
unsigned long delta;
|
|
unsigned int cpu;
|
|
int rc = -EINVAL;
|
|
|
|
if (pcpu_chosen_fc != PCPU_FC_PAGE) {
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|
rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
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|
PERCPU_DYNAMIC_RESERVE, 4 << 20,
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|
pcpu_cpu_distance,
|
|
pcpu_alloc_bootmem,
|
|
pcpu_free_bootmem);
|
|
if (rc)
|
|
pr_warning("PERCPU: %s allocator failed (%d), "
|
|
"falling back to page size\n",
|
|
pcpu_fc_names[pcpu_chosen_fc], rc);
|
|
}
|
|
if (rc < 0)
|
|
rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE,
|
|
pcpu_alloc_bootmem,
|
|
pcpu_free_bootmem,
|
|
pcpu_populate_pte);
|
|
if (rc < 0)
|
|
panic("cannot initialize percpu area (err=%d)", rc);
|
|
|
|
delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
|
|
for_each_possible_cpu(cpu)
|
|
__per_cpu_offset(cpu) = delta + pcpu_unit_offsets[cpu];
|
|
|
|
/* Setup %g5 for the boot cpu. */
|
|
__local_per_cpu_offset = __per_cpu_offset(smp_processor_id());
|
|
|
|
of_fill_in_cpu_data();
|
|
if (tlb_type == hypervisor)
|
|
mdesc_fill_in_cpu_data(cpu_all_mask);
|
|
}
|