diff options
Diffstat (limited to 'arch/sparc64/kernel/smp.c')
| -rw-r--r-- | arch/sparc64/kernel/smp.c | 1413 |
1 files changed, 0 insertions, 1413 deletions
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c deleted file mode 100644 index f500b0618bb..00000000000 --- a/arch/sparc64/kernel/smp.c +++ /dev/null @@ -1,1413 +0,0 @@ -/* smp.c: Sparc64 SMP support. - * - * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net) - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/pagemap.h> -#include <linux/threads.h> -#include <linux/smp.h> -#include <linux/interrupt.h> -#include <linux/kernel_stat.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/fs.h> -#include <linux/seq_file.h> -#include <linux/cache.h> -#include <linux/jiffies.h> -#include <linux/profile.h> -#include <linux/lmb.h> -#include <linux/cpu.h> - -#include <asm/head.h> -#include <asm/ptrace.h> -#include <asm/atomic.h> -#include <asm/tlbflush.h> -#include <asm/mmu_context.h> -#include <asm/cpudata.h> -#include <asm/hvtramp.h> -#include <asm/io.h> -#include <asm/timer.h> - -#include <asm/irq.h> -#include <asm/irq_regs.h> -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/oplib.h> -#include <asm/uaccess.h> -#include <asm/starfire.h> -#include <asm/tlb.h> -#include <asm/sections.h> -#include <asm/prom.h> -#include <asm/mdesc.h> -#include <asm/ldc.h> -#include <asm/hypervisor.h> - -int sparc64_multi_core __read_mostly; - -cpumask_t cpu_possible_map __read_mostly = CPU_MASK_NONE; -cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE; -DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE; -cpumask_t cpu_core_map[NR_CPUS] __read_mostly = - { [0 ... NR_CPUS-1] = CPU_MASK_NONE }; - -EXPORT_SYMBOL(cpu_possible_map); -EXPORT_SYMBOL(cpu_online_map); -EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); -EXPORT_SYMBOL(cpu_core_map); - -static cpumask_t smp_commenced_mask; - -void smp_info(struct seq_file *m) -{ - int i; - - seq_printf(m, "State:\n"); - for_each_online_cpu(i) - seq_printf(m, "CPU%d:\t\tonline\n", i); -} - -void smp_bogo(struct seq_file *m) -{ - int i; - - for_each_online_cpu(i) - seq_printf(m, - "Cpu%dClkTck\t: %016lx\n", - i, cpu_data(i).clock_tick); -} - -extern void setup_sparc64_timer(void); - -static volatile unsigned long callin_flag = 0; - -void __cpuinit smp_callin(void) -{ - int cpuid = hard_smp_processor_id(); - - __local_per_cpu_offset = __per_cpu_offset(cpuid); - - if (tlb_type == hypervisor) - sun4v_ktsb_register(); - - __flush_tlb_all(); - - setup_sparc64_timer(); - - if (cheetah_pcache_forced_on) - cheetah_enable_pcache(); - - local_irq_enable(); - - callin_flag = 1; - __asm__ __volatile__("membar #Sync\n\t" - "flush %%g6" : : : "memory"); - - /* Clear this or we will die instantly when we - * schedule back to this idler... - */ - current_thread_info()->new_child = 0; - - /* Attach to the address space of init_task. */ - atomic_inc(&init_mm.mm_count); - current->active_mm = &init_mm; - - /* inform the notifiers about the new cpu */ - notify_cpu_starting(cpuid); - - while (!cpu_isset(cpuid, smp_commenced_mask)) - rmb(); - - ipi_call_lock(); - cpu_set(cpuid, cpu_online_map); - ipi_call_unlock(); - - /* idle thread is expected to have preempt disabled */ - preempt_disable(); -} - -void cpu_panic(void) -{ - printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); - panic("SMP bolixed\n"); -} - -/* This tick register synchronization scheme is taken entirely from - * the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit. - * - * The only change I've made is to rework it so that the master - * initiates the synchonization instead of the slave. -DaveM - */ - -#define MASTER 0 -#define SLAVE (SMP_CACHE_BYTES/sizeof(unsigned long)) - -#define NUM_ROUNDS 64 /* magic value */ -#define NUM_ITERS 5 /* likewise */ - -static DEFINE_SPINLOCK(itc_sync_lock); -static unsigned long go[SLAVE + 1]; - -#define DEBUG_TICK_SYNC 0 - -static inline long get_delta (long *rt, long *master) -{ - unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; - unsigned long tcenter, t0, t1, tm; - unsigned long i; - - for (i = 0; i < NUM_ITERS; i++) { - t0 = tick_ops->get_tick(); - go[MASTER] = 1; - membar_storeload(); - while (!(tm = go[SLAVE])) - rmb(); - go[SLAVE] = 0; - wmb(); - t1 = tick_ops->get_tick(); - - if (t1 - t0 < best_t1 - best_t0) - best_t0 = t0, best_t1 = t1, best_tm = tm; - } - - *rt = best_t1 - best_t0; - *master = best_tm - best_t0; - - /* average best_t0 and best_t1 without overflow: */ - tcenter = (best_t0/2 + best_t1/2); - if (best_t0 % 2 + best_t1 % 2 == 2) - tcenter++; - return tcenter - best_tm; -} - -void smp_synchronize_tick_client(void) -{ - long i, delta, adj, adjust_latency = 0, done = 0; - unsigned long flags, rt, master_time_stamp, bound; -#if DEBUG_TICK_SYNC - struct { - long rt; /* roundtrip time */ - long master; /* master's timestamp */ - long diff; /* difference between midpoint and master's timestamp */ - long lat; /* estimate of itc adjustment latency */ - } t[NUM_ROUNDS]; -#endif - - go[MASTER] = 1; - - while (go[MASTER]) - rmb(); - - local_irq_save(flags); - { - for (i = 0; i < NUM_ROUNDS; i++) { - delta = get_delta(&rt, &master_time_stamp); - if (delta == 0) { - done = 1; /* let's lock on to this... */ - bound = rt; - } - - if (!done) { - if (i > 0) { - adjust_latency += -delta; - adj = -delta + adjust_latency/4; - } else - adj = -delta; - - tick_ops->add_tick(adj); - } -#if DEBUG_TICK_SYNC - t[i].rt = rt; - t[i].master = master_time_stamp; - t[i].diff = delta; - t[i].lat = adjust_latency/4; -#endif - } - } - local_irq_restore(flags); - -#if DEBUG_TICK_SYNC - for (i = 0; i < NUM_ROUNDS; i++) - printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", - t[i].rt, t[i].master, t[i].diff, t[i].lat); -#endif - - printk(KERN_INFO "CPU %d: synchronized TICK with master CPU " - "(last diff %ld cycles, maxerr %lu cycles)\n", - smp_processor_id(), delta, rt); -} - -static void smp_start_sync_tick_client(int cpu); - -static void smp_synchronize_one_tick(int cpu) -{ - unsigned long flags, i; - - go[MASTER] = 0; - - smp_start_sync_tick_client(cpu); - - /* wait for client to be ready */ - while (!go[MASTER]) - rmb(); - - /* now let the client proceed into his loop */ - go[MASTER] = 0; - membar_storeload(); - - spin_lock_irqsave(&itc_sync_lock, flags); - { - for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) { - while (!go[MASTER]) - rmb(); - go[MASTER] = 0; - wmb(); - go[SLAVE] = tick_ops->get_tick(); - membar_storeload(); - } - } - spin_unlock_irqrestore(&itc_sync_lock, flags); -} - -#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU) -/* XXX Put this in some common place. XXX */ -static unsigned long kimage_addr_to_ra(void *p) -{ - unsigned long val = (unsigned long) p; - - return kern_base + (val - KERNBASE); -} - -static void __cpuinit ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg) -{ - extern unsigned long sparc64_ttable_tl0; - extern unsigned long kern_locked_tte_data; - struct hvtramp_descr *hdesc; - unsigned long trampoline_ra; - struct trap_per_cpu *tb; - u64 tte_vaddr, tte_data; - unsigned long hv_err; - int i; - - hdesc = kzalloc(sizeof(*hdesc) + - (sizeof(struct hvtramp_mapping) * - num_kernel_image_mappings - 1), - GFP_KERNEL); - if (!hdesc) { - printk(KERN_ERR "ldom_startcpu_cpuid: Cannot allocate " - "hvtramp_descr.\n"); - return; - } - - hdesc->cpu = cpu; - hdesc->num_mappings = num_kernel_image_mappings; - - tb = &trap_block[cpu]; - tb->hdesc = hdesc; - - hdesc->fault_info_va = (unsigned long) &tb->fault_info; - hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info); - - hdesc->thread_reg = thread_reg; - - tte_vaddr = (unsigned long) KERNBASE; - tte_data = kern_locked_tte_data; - - for (i = 0; i < hdesc->num_mappings; i++) { - hdesc->maps[i].vaddr = tte_vaddr; - hdesc->maps[i].tte = tte_data; - tte_vaddr += 0x400000; - tte_data += 0x400000; - } - - trampoline_ra = kimage_addr_to_ra(hv_cpu_startup); - - hv_err = sun4v_cpu_start(cpu, trampoline_ra, - kimage_addr_to_ra(&sparc64_ttable_tl0), - __pa(hdesc)); - if (hv_err) - printk(KERN_ERR "ldom_startcpu_cpuid: sun4v_cpu_start() " - "gives error %lu\n", hv_err); -} -#endif - -extern unsigned long sparc64_cpu_startup; - -/* The OBP cpu startup callback truncates the 3rd arg cookie to - * 32-bits (I think) so to be safe we have it read the pointer - * contained here so we work on >4GB machines. -DaveM - */ -static struct thread_info *cpu_new_thread = NULL; - -static int __cpuinit smp_boot_one_cpu(unsigned int cpu) -{ - struct trap_per_cpu *tb = &trap_block[cpu]; - unsigned long entry = - (unsigned long)(&sparc64_cpu_startup); - unsigned long cookie = - (unsigned long)(&cpu_new_thread); - struct task_struct *p; - int timeout, ret; - - p = fork_idle(cpu); - if (IS_ERR(p)) - return PTR_ERR(p); - callin_flag = 0; - cpu_new_thread = task_thread_info(p); - - if (tlb_type == hypervisor) { -#if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU) - if (ldom_domaining_enabled) - ldom_startcpu_cpuid(cpu, - (unsigned long) cpu_new_thread); - else -#endif - prom_startcpu_cpuid(cpu, entry, cookie); - } else { - struct device_node *dp = of_find_node_by_cpuid(cpu); - - prom_startcpu(dp->node, entry, cookie); - } - - for (timeout = 0; timeout < 50000; timeout++) { - if (callin_flag) - break; - udelay(100); - } - - if (callin_flag) { - ret = 0; - } else { - printk("Processor %d is stuck.\n", cpu); - ret = -ENODEV; - } - cpu_new_thread = NULL; - - if (tb->hdesc) { - kfree(tb->hdesc); - tb->hdesc = NULL; - } - - return ret; -} - -static void spitfire_xcall_helper(u64 data0, u64 data1, u64 data2, u64 pstate, unsigned long cpu) -{ - u64 result, target; - int stuck, tmp; - - if (this_is_starfire) { - /* map to real upaid */ - cpu = (((cpu & 0x3c) << 1) | - ((cpu & 0x40) >> 4) | - (cpu & 0x3)); - } - - target = (cpu << 14) | 0x70; -again: - /* Ok, this is the real Spitfire Errata #54. - * One must read back from a UDB internal register - * after writes to the UDB interrupt dispatch, but - * before the membar Sync for that write. - * So we use the high UDB control register (ASI 0x7f, - * ADDR 0x20) for the dummy read. -DaveM - */ - tmp = 0x40; - __asm__ __volatile__( - "wrpr %1, %2, %%pstate\n\t" - "stxa %4, [%0] %3\n\t" - "stxa %5, [%0+%8] %3\n\t" - "add %0, %8, %0\n\t" - "stxa %6, [%0+%8] %3\n\t" - "membar #Sync\n\t" - "stxa %%g0, [%7] %3\n\t" - "membar #Sync\n\t" - "mov 0x20, %%g1\n\t" - "ldxa [%%g1] 0x7f, %%g0\n\t" - "membar #Sync" - : "=r" (tmp) - : "r" (pstate), "i" (PSTATE_IE), "i" (ASI_INTR_W), - "r" (data0), "r" (data1), "r" (data2), "r" (target), - "r" (0x10), "0" (tmp) - : "g1"); - - /* NOTE: PSTATE_IE is still clear. */ - stuck = 100000; - do { - __asm__ __volatile__("ldxa [%%g0] %1, %0" - : "=r" (result) - : "i" (ASI_INTR_DISPATCH_STAT)); - if (result == 0) { - __asm__ __volatile__("wrpr %0, 0x0, %%pstate" - : : "r" (pstate)); - return; - } - stuck -= 1; - if (stuck == 0) - break; - } while (result & 0x1); - __asm__ __volatile__("wrpr %0, 0x0, %%pstate" - : : "r" (pstate)); - if (stuck == 0) { - printk("CPU[%d]: mondo stuckage result[%016lx]\n", - smp_processor_id(), result); - } else { - udelay(2); - goto again; - } -} - -static void spitfire_xcall_deliver(struct trap_per_cpu *tb, int cnt) -{ - u64 *mondo, data0, data1, data2; - u16 *cpu_list; - u64 pstate; - int i; - - __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); - cpu_list = __va(tb->cpu_list_pa); - mondo = __va(tb->cpu_mondo_block_pa); - data0 = mondo[0]; - data1 = mondo[1]; - data2 = mondo[2]; - for (i = 0; i < cnt; i++) - spitfire_xcall_helper(data0, data1, data2, pstate, cpu_list[i]); -} - -/* 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[%016lx]\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; - } - } -} - -/* Multi-cpu list version. */ -static void hypervisor_xcall_deliver(struct trap_per_cpu *tb, int cnt) -{ - int retries, this_cpu, prev_sent, i, saw_cpu_error; - unsigned long status; - u16 *cpu_list; - - this_cpu = smp_processor_id(); - - cpu_list = __va(tb->cpu_list_pa); - - saw_cpu_error = 0; - retries = 0; - prev_sent = 0; - do { - int forward_progress, n_sent; - - 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)) - break; - - /* First, see if we made any forward progress. - * - * The hypervisor indicates successful sends by setting - * cpu list entries to the value 0xffff. - */ - n_sent = 0; - for (i = 0; i < cnt; i++) { - if (likely(cpu_list[i] == 0xffff)) - n_sent++; - } - - forward_progress = 0; - if (n_sent > prev_sent) - forward_progress = 1; - - prev_sent = n_sent; - - /* If we get a HV_ECPUERROR, then one or more of the cpus - * in the list are in error state. Use the cpu_state() - * hypervisor call to find out which cpus are in error state. - */ - if (unlikely(status == HV_ECPUERROR)) { - for (i = 0; i < cnt; i++) { - long err; - u16 cpu; - - cpu = cpu_list[i]; - if (cpu == 0xffff) - continue; - - err = sun4v_cpu_state(cpu); - if (err == HV_CPU_STATE_ERROR) { - saw_cpu_error = (cpu + 1); - cpu_list[i] = 0xffff; - } - } - } else if (unlikely(status != HV_EWOULDBLOCK)) - goto fatal_mondo_error; - - /* Don't bother rewriting the CPU list, just leave the - * 0xffff and non-0xffff entries in there and the - * hypervisor will do the right thing. - * - * Only advance timeout state if we didn't make any - * forward progress. - */ - if (unlikely(!forward_progress)) { - if (unlikely(++retries > 10000)) - goto fatal_mondo_timeout; - - /* Delay a little bit to let other cpus catch up - * on their cpu mondo queue work. - */ - udelay(2 * cnt); - } - } while (1); - - if (unlikely(saw_cpu_error)) - goto fatal_mondo_cpu_error; - - return; - -fatal_mondo_cpu_error: - printk(KERN_CRIT "CPU[%d]: SUN4V mondo cpu error, some target cpus " - "(including %d) were in error state\n", - this_cpu, saw_cpu_error - 1); - return; - -fatal_mondo_timeout: - printk(KERN_CRIT "CPU[%d]: SUN4V mondo timeout, no forward " - " progress after %d retries.\n", - this_cpu, retries); - goto dump_cpu_list_and_out; - -fatal_mondo_error: - printk(KERN_CRIT "CPU[%d]: Unexpected SUN4V mondo error %lu\n", - this_cpu, status); - printk(KERN_CRIT "CPU[%d]: Args were cnt(%d) cpulist_pa(%lx) " - "mondo_block_pa(%lx)\n", - this_cpu, cnt, tb->cpu_list_pa, tb->cpu_mondo_block_pa); - -dump_cpu_list_and_out: - printk(KERN_CRIT "CPU[%d]: CPU list [ ", this_cpu); - for (i = 0; i < cnt; i++) - printk("%u ", cpu_list[i]); - printk("]\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_mask_nr(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_map" and "&mm->cpu_vm_mask". - */ -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_map); -} - -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(cpu)); -} - -extern unsigned long xcall_call_function; - -void arch_send_call_function_ipi(cpumask_t 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(cpu)); -} - -void smp_call_function_client(int irq, struct pt_regs *regs) -{ - clear_softint(1 << irq); - generic_smp_call_function_interrupt(); -} - -void smp_call_function_single_client(int irq, struct pt_regs *regs) -{ - clear_softint(1 << irq); - generic_smp_call_function_single_interrupt(); -} - -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 "currrent->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_mask(mm->cpu_vm_mask, tsb_sync, mm, 1); -} - -extern unsigned long xcall_flush_tlb_mm; -extern unsigned long xcall_flush_tlb_pending; -extern unsigned long xcall_flush_tlb_kernel_range; -extern unsigned long xcall_fetch_glob_regs; -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; - -#ifdef CONFIG_DEBUG_DCFLUSH -extern atomic_t dcpage_flushes; -extern atomic_t dcpage_flushes_xcall; -#endif - -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(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; - int this_cpu; - u64 data0; - - if (tlb_type == hypervisor) - return; - - this_cpu = get_cpu(); - -#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_map); -#ifdef CONFIG_DEBUG_DCFLUSH - atomic_inc(&dcpage_flushes_xcall); -#endif - } - __local_flush_dcache_page(page); - - put_cpu(); -} - -void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs) -{ - struct mm_struct *mm; - unsigned long flags; - - clear_softint(1 << irq); - - /* See if we need to allocate a new TLB context because - * the version of the one we are using is now out of date. - */ - mm = current->active_mm; - if (unlikely(!mm || (mm == &init_mm))) - return; - - spin_lock_irqsave(&mm->context.lock, flags); - - if (unlikely(!CTX_VALID(mm->context))) - get_new_mmu_context(mm); - - spin_unlock_irqrestore(&mm->context.lock, flags); - - load_secondary_context(mm); - __flush_tlb_mm(CTX_HWBITS(mm->context), - SECONDARY_CONTEXT); -} - -void smp_new_mmu_context_version(void) -{ - smp_cross_call(&xcall_new_mmu_context_version, 0, 0, 0); -} - -#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); -} - -/* 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->active_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) { - mm->cpu_vm_mask = cpumask_of_cpu(cpu); - goto local_flush_and_out; - } - - smp_cross_call_masked(&xcall_flush_tlb_mm, - ctx, 0, 0, - &mm->cpu_vm_mask); - -local_flush_and_out: - __flush_tlb_mm(ctx, SECONDARY_CONTEXT); - - put_cpu(); -} - -void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs) -{ - u32 ctx = CTX_HWBITS(mm->context); - int cpu = get_cpu(); - - if (mm == current->active_mm && atomic_read(&mm->mm_users) == 1) - mm->cpu_vm_mask = cpumask_of_cpu(cpu); - else - smp_cross_call_masked(&xcall_flush_tlb_pending, - ctx, nr, (unsigned long) vaddrs, - &mm->cpu_vm_mask); - - __flush_tlb_pending(ctx, nr, vaddrs); - - 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_ret(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; - membar_storestore_loadstore(); - 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_storeload_storestore(); - atomic_dec(&smp_capture_registry); - } -} - -/* Imprisoned penguins run with %pil == 15, but PSTATE_IE set, so they - * can service tlb flush xcalls... - */ -extern void prom_world(int); - -void 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_storeload_storestore(); - 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 __devinit 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 __devinit smp_fill_in_sib_core_maps(void) -{ - unsigned int i; - - for_each_present_cpu(i) { - unsigned int j; - - cpus_clear(cpu_core_map[i]); - if (cpu_data(i).core_id == 0) { - cpu_set(i, cpu_core_map[i]); - continue; - } - - for_each_present_cpu(j) { - if (cpu_data(i).core_id == - cpu_data(j).core_id) - cpu_set(j, cpu_core_map[i]); - } - } - - for_each_present_cpu(i) { - unsigned int j; - - cpus_clear(per_cpu(cpu_sibling_map, i)); - if (cpu_data(i).proc_id == -1) { - cpu_set(i, per_cpu(cpu_sibling_map, i)); - continue; - } - - for_each_present_cpu(j) { - if (cpu_data(i).proc_id == - cpu_data(j).proc_id) - cpu_set(j, per_cpu(cpu_sibling_map, i)); - } - } -} - -int __cpuinit __cpu_up(unsigned int cpu) -{ - int ret = smp_boot_one_cpu(cpu); - - if (!ret) { - cpu_set(cpu, smp_commenced_mask); - while (!cpu_isset(cpu, cpu_online_map)) - mb(); - if (!cpu_isset(cpu, cpu_online_map)) { - 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); - } - - cpu_clear(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_mask(i, cpu_core_map[cpu]) - cpu_clear(cpu, cpu_core_map[i]); - cpus_clear(cpu_core_map[cpu]); - - for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) - cpu_clear(cpu, per_cpu(cpu_sibling_map, i)); - cpus_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(); - - ipi_call_lock(); - cpu_clear(cpu, cpu_online_map); - ipi_call_unlock(); - - return 0; -} - -void __cpu_die(unsigned int cpu) -{ - int i; - - for (i = 0; i < 100; i++) { - smp_rmb(); - if (!cpu_isset(cpu, smp_commenced_mask)) - break; - msleep(100); - } - if (cpu_isset(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) { - cpu_clear(cpu, cpu_present_map); - 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) -{ - xcall_deliver((u64) &xcall_receive_signal, 0, 0, - &cpumask_of_cpu(cpu)); -} - -void smp_receive_signal_client(int irq, struct pt_regs *regs) -{ - clear_softint(1 << irq); -} - -/* This is a nop because we capture all other cpus - * anyways when making the PROM active. - */ -void smp_send_stop(void) -{ -} - -unsigned long __per_cpu_base __read_mostly; -unsigned long __per_cpu_shift __read_mostly; - -EXPORT_SYMBOL(__per_cpu_base); -EXPORT_SYMBOL(__per_cpu_shift); - -void __init real_setup_per_cpu_areas(void) -{ - unsigned long paddr, goal, size, i; - char *ptr; - - /* Copy section for each CPU (we discard the original) */ - goal = PERCPU_ENOUGH_ROOM; - - __per_cpu_shift = PAGE_SHIFT; - for (size = PAGE_SIZE; size < goal; size <<= 1UL) - __per_cpu_shift++; - - paddr = lmb_alloc(size * NR_CPUS, PAGE_SIZE); - if (!paddr) { - prom_printf("Cannot allocate per-cpu memory.\n"); - prom_halt(); - } - - ptr = __va(paddr); - __per_cpu_base = ptr - __per_cpu_start; - - for (i = 0; i < NR_CPUS; i++, ptr += size) - memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); - - /* Setup %g5 for the boot cpu. */ - __local_per_cpu_offset = __per_cpu_offset(smp_processor_id()); -} |