Commit e0204409 authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: dr-cpu unconfigure support.


Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f3c681c0
......@@ -20,6 +20,7 @@
#include <asm/power.h>
#include <asm/mdesc.h>
#include <asm/head.h>
#include <asm/irq.h>
#define DRV_MODULE_NAME "ds"
#define PFX DRV_MODULE_NAME ": "
......@@ -559,6 +560,9 @@ static int dr_cpu_configure(struct ds_cap_state *cp, u64 req_num,
kfree(resp);
/* Redistribute IRQs, taking into account the new cpus. */
fixup_irqs();
return 0;
}
......@@ -566,7 +570,8 @@ static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num,
cpumask_t *mask)
{
struct ds_data *resp;
int resp_len, ncpus;
int resp_len, ncpus, cpu;
unsigned long flags;
ncpus = cpus_weight(*mask);
resp_len = dr_cpu_size_response(ncpus);
......@@ -578,9 +583,25 @@ static int dr_cpu_unconfigure(struct ds_cap_state *cp, u64 req_num,
resp_len, ncpus, mask,
DR_CPU_STAT_UNCONFIGURED);
for_each_cpu_mask(cpu, *mask) {
int err;
printk(KERN_INFO PFX "CPU[%d]: Shutting down cpu %d...\n",
smp_processor_id(), cpu);
err = cpu_down(cpu);
if (err)
dr_cpu_mark(resp, cpu, ncpus,
DR_CPU_RES_FAILURE,
DR_CPU_STAT_CONFIGURED);
}
spin_lock_irqsave(&ds_lock, flags);
ds_send(ds_info->lp, resp, resp_len);
spin_unlock_irqrestore(&ds_lock, flags);
kfree(resp);
return -EOPNOTSUPP;
return 0;
}
static void process_dr_cpu_list(struct ds_cap_state *cp)
......
......@@ -803,6 +803,26 @@ void handler_irq(int irq, struct pt_regs *regs)
set_irq_regs(old_regs);
}
#ifdef CONFIG_HOTPLUG_CPU
void fixup_irqs(void)
{
unsigned int irq;
for (irq = 0; irq < NR_IRQS; irq++) {
unsigned long flags;
spin_lock_irqsave(&irq_desc[irq].lock, flags);
if (irq_desc[irq].action &&
!(irq_desc[irq].status & IRQ_PER_CPU)) {
if (irq_desc[irq].chip->set_affinity)
irq_desc[irq].chip->set_affinity(irq,
irq_desc[irq].affinity);
}
spin_unlock_irqrestore(&irq_desc[irq].lock, flags);
}
}
#endif
struct sun5_timer {
u64 count0;
u64 limit0;
......
......@@ -29,6 +29,7 @@
#include <linux/compat.h>
#include <linux/tick.h>
#include <linux/init.h>
#include <linux/cpu.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>
......@@ -49,7 +50,7 @@
/* #define VERBOSE_SHOWREGS */
static void sparc64_yield(void)
static void sparc64_yield(int cpu)
{
if (tlb_type != hypervisor)
return;
......@@ -57,7 +58,7 @@ static void sparc64_yield(void)
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb__after_clear_bit();
while (!need_resched()) {
while (!need_resched() && !cpu_is_offline(cpu)) {
unsigned long pstate;
/* Disable interrupts. */
......@@ -68,7 +69,7 @@ static void sparc64_yield(void)
: "=&r" (pstate)
: "i" (PSTATE_IE));
if (!need_resched())
if (!need_resched() && !cpu_is_offline(cpu))
sun4v_cpu_yield();
/* Re-enable interrupts. */
......@@ -86,15 +87,25 @@ static void sparc64_yield(void)
/* The idle loop on sparc64. */
void cpu_idle(void)
{
int cpu = smp_processor_id();
set_thread_flag(TIF_POLLING_NRFLAG);
while(1) {
tick_nohz_stop_sched_tick();
while (!need_resched())
sparc64_yield();
while (!need_resched() && !cpu_is_offline(cpu))
sparc64_yield(cpu);
tick_nohz_restart_sched_tick();
preempt_enable_no_resched();
#ifdef CONFIG_HOTPLUG_CPU
if (cpu_is_offline(cpu))
cpu_play_dead();
#endif
schedule();
preempt_disable();
}
......
......@@ -44,6 +44,7 @@
#include <asm/prom.h>
#include <asm/mdesc.h>
#include <asm/ldc.h>
#include <asm/hypervisor.h>
extern void calibrate_delay(void);
......@@ -62,7 +63,6 @@ EXPORT_SYMBOL(cpu_sibling_map);
EXPORT_SYMBOL(cpu_core_map);
static cpumask_t smp_commenced_mask;
static cpumask_t cpu_callout_map;
void smp_info(struct seq_file *m)
{
......@@ -83,6 +83,8 @@ void smp_bogo(struct seq_file *m)
i, cpu_data(i).clock_tick);
}
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock);
extern void setup_sparc64_timer(void);
static volatile unsigned long callin_flag = 0;
......@@ -121,7 +123,9 @@ void __devinit smp_callin(void)
while (!cpu_isset(cpuid, smp_commenced_mask))
rmb();
spin_lock(&call_lock);
cpu_set(cpuid, cpu_online_map);
spin_unlock(&call_lock);
/* idle thread is expected to have preempt disabled */
preempt_disable();
......@@ -324,6 +328,9 @@ static void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg)
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
......@@ -350,7 +357,6 @@ static int __devinit smp_boot_one_cpu(unsigned int cpu)
p = fork_idle(cpu);
callin_flag = 0;
cpu_new_thread = task_thread_info(p);
cpu_set(cpu, cpu_callout_map);
if (tlb_type == hypervisor) {
/* Alloc the mondo queues, cpu will load them. */
......@@ -379,7 +385,6 @@ static int __devinit smp_boot_one_cpu(unsigned int cpu)
ret = 0;
} else {
printk("Processor %d is stuck.\n", cpu);
cpu_clear(cpu, cpu_callout_map);
ret = -ENODEV;
}
cpu_new_thread = NULL;
......@@ -791,7 +796,6 @@ struct call_data_struct {
int wait;
};
static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock);
static struct call_data_struct *call_data;
extern unsigned long xcall_call_function;
......@@ -1241,7 +1245,7 @@ void __devinit smp_fill_in_sib_core_maps(void)
{
unsigned int i;
for_each_possible_cpu(i) {
for_each_present_cpu(i) {
unsigned int j;
cpus_clear(cpu_core_map[i]);
......@@ -1250,14 +1254,14 @@ void __devinit smp_fill_in_sib_core_maps(void)
continue;
}
for_each_possible_cpu(j) {
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_possible_cpu(i) {
for_each_present_cpu(i) {
unsigned int j;
cpus_clear(cpu_sibling_map[i]);
......@@ -1266,7 +1270,7 @@ void __devinit smp_fill_in_sib_core_maps(void)
continue;
}
for_each_possible_cpu(j) {
for_each_present_cpu(j) {
if (cpu_data(i).proc_id ==
cpu_data(j).proc_id)
cpu_set(j, cpu_sibling_map[i]);
......@@ -1296,16 +1300,106 @@ int __cpuinit __cpu_up(unsigned int cpu)
}
#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)
{
printk(KERN_ERR "SMP: __cpu_disable() on cpu %d\n",
smp_processor_id());
return -ENODEV;
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, cpu_sibling_map[cpu])
cpu_clear(cpu, cpu_sibling_map[i]);
cpus_clear(cpu_sibling_map[cpu]);
c = &cpu_data(cpu);
c->core_id = 0;
c->proc_id = -1;
spin_lock(&call_lock);
cpu_clear(cpu, cpu_online_map);
spin_unlock(&call_lock);
smp_wmb();
/* Make sure no interrupts point to this cpu. */
fixup_irqs();
local_irq_enable();
mdelay(1);
local_irq_disable();
return 0;
}
void __cpu_die(unsigned int cpu)
{
printk(KERN_ERR "SMP: __cpu_die(%u)\n", 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
......
......@@ -53,6 +53,8 @@ extern unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p,
extern void sun4v_destroy_msi(unsigned int virt_irq);
extern unsigned int sbus_build_irq(void *sbus, unsigned int ino);
extern void fixup_irqs(void);
static __inline__ void set_softint(unsigned long bits)
{
__asm__ __volatile__("wr %0, 0x0, %%set_softint"
......
......@@ -76,6 +76,9 @@ static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, str
unsigned long ctx_valid, flags;
int cpu;
if (unlikely(mm == &init_mm))
return;
spin_lock_irqsave(&mm->context.lock, flags);
ctx_valid = CTX_VALID(mm->context);
if (!ctx_valid)
......
......@@ -41,7 +41,7 @@ extern int hard_smp_processor_id(void);
#define raw_smp_processor_id() (current_thread_info()->cpu)
extern void smp_fill_in_sib_core_maps(void);
extern unsigned char boot_cpu_id;
extern void cpu_play_dead(void);
#ifdef CONFIG_HOTPLUG_CPU
extern int __cpu_disable(void);
......@@ -54,7 +54,6 @@ extern void __cpu_die(unsigned int cpu);
#define hard_smp_processor_id() 0
#define smp_fill_in_sib_core_maps() do { } while (0)
#define boot_cpu_id (0)
#endif /* !(CONFIG_SMP) */
......
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