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authorSteven Miao <realmz6@gmail.com>2013-07-09 15:39:53 +0800
committerSteven Miao <realmz6@gmail.com>2013-07-09 15:50:38 +0800
commit150382a53d11256e5666c86525c8bf8d23684532 (patch)
tree5a0e5a70ba6006456c4d28ec53e6bf35c353e90c /arch/blackfin
parentb700a3f304cfc8589f3a5b6012bdd3689b778033 (diff)
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smp: refine bf561 smpboot code
release boot lock earlier to let coreb do setup and calibrate set coreb online later after initialization ready add BFIN_IPI_NONE IPI type drop unnecesarry smp_mb() and using atomic type Signed-off-by: Steven Miao <realmz6@gmail.com>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/mach-bf561/smp.c7
-rw-r--r--arch/blackfin/mach-common/smp.c18
2 files changed, 11 insertions, 14 deletions
diff --git a/arch/blackfin/mach-bf561/smp.c b/arch/blackfin/mach-bf561/smp.c
index ab1c617b9cfc..c77a23bc9de3 100644
--- a/arch/blackfin/mach-bf561/smp.c
+++ b/arch/blackfin/mach-bf561/smp.c
@@ -69,7 +69,6 @@ void __cpuinit platform_secondary_init(unsigned int cpu)
SSYNC();
/* We are done with local CPU inits, unblock the boot CPU. */
- set_cpu_online(cpu, true);
spin_lock(&boot_lock);
spin_unlock(&boot_lock);
}
@@ -91,7 +90,9 @@ int __cpuinit platform_boot_secondary(unsigned int cpu, struct task_struct *idle
SSYNC();
}
- timeout = jiffies + 1 * HZ;
+ timeout = jiffies + HZ;
+ /* release the lock and let coreb run */
+ spin_unlock(&boot_lock);
while (time_before(jiffies, timeout)) {
if (cpu_online(cpu))
break;
@@ -100,8 +101,6 @@ int __cpuinit platform_boot_secondary(unsigned int cpu, struct task_struct *idle
}
if (cpu_online(cpu)) {
- /* release the lock and let coreb run */
- spin_unlock(&boot_lock);
return 0;
} else
panic("CPU%u: processor failed to boot\n", cpu);
diff --git a/arch/blackfin/mach-common/smp.c b/arch/blackfin/mach-common/smp.c
index 1bc2ce6f3c94..961d8392e5e3 100644
--- a/arch/blackfin/mach-common/smp.c
+++ b/arch/blackfin/mach-common/smp.c
@@ -49,6 +49,7 @@ unsigned long blackfin_iflush_l1_entry[NR_CPUS];
struct blackfin_initial_pda __cpuinitdata initial_pda_coreb;
enum ipi_message_type {
+ BFIN_IPI_NONE,
BFIN_IPI_TIMER,
BFIN_IPI_RESCHEDULE,
BFIN_IPI_CALL_FUNC,
@@ -72,8 +73,8 @@ static DEFINE_SPINLOCK(stop_lock);
/* Simple FIFO buffer, overflow leads to panic */
struct ipi_data {
- unsigned long count;
- unsigned long bits;
+ atomic_t count;
+ atomic_t bits;
};
static DEFINE_PER_CPU(struct ipi_data, bfin_ipi);
@@ -146,7 +147,6 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
platform_clear_ipi(cpu, IRQ_SUPPLE_1);
bfin_ipi_data = &__get_cpu_var(bfin_ipi);
- smp_mb();
while ((pending = xchg(&bfin_ipi_data->bits, 0)) != 0) {
msg = 0;
do {
@@ -170,9 +170,8 @@ static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
ipi_cpu_stop(cpu);
break;
}
+ atomic_dec(&bfin_ipi_data->count);
} while (msg < BITS_PER_LONG);
-
- smp_mb();
}
return IRQ_HANDLED;
}
@@ -195,12 +194,10 @@ void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
unsigned long flags;
local_irq_save(flags);
- smp_mb();
for_each_cpu(cpu, cpumask) {
bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
- smp_mb();
- set_bit(msg, &bfin_ipi_data->bits);
- bfin_ipi_data->count++;
+ atomic_set_mask((1 << msg), &bfin_ipi_data->bits);
+ atomic_inc(&bfin_ipi_data->count);
platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
}
@@ -319,7 +316,6 @@ void __cpuinit secondary_start_kernel(void)
setup_secondary(cpu);
platform_secondary_init(cpu);
-
/* setup local core timer */
bfin_local_timer_setup();
@@ -335,6 +331,8 @@ void __cpuinit secondary_start_kernel(void)
*/
calibrate_delay();
+ /* We are done with local CPU inits, unblock the boot CPU. */
+ set_cpu_online(cpu, true);
cpu_startup_entry(CPUHP_ONLINE);
}