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Message-ID: <20120601091337.31979.89266.stgit@srivatsabhat.in.ibm.com>
Date: Fri, 01 Jun 2012 14:43:43 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: tglx@...utronix.de, peterz@...radead.org,
paulmck@...ux.vnet.ibm.com
Cc: rusty@...tcorp.com.au, mingo@...nel.org, yong.zhang0@...il.com,
akpm@...ux-foundation.org, vatsa@...ux.vnet.ibm.com, rjw@...k.pl,
linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
srivatsa.bhat@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
David Howells <dhowells@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Mike Frysinger <vapier@...too.org>, linux-ia64@...r.kernel.org
Subject: [PATCH 15/27] ia64, smpboot: Use generic SMP booting infrastructure
From: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
Convert ia64 to use the generic framework to boot secondary CPUs.
Notes:
1. ia64 manipulates the cpu_online_mask under vector_lock. So, while
converting over to the generic smp booting code, override arch_vector_lock()
and arch_vector_unlock() appropriately.
2. ia64 needs to enable interrupts before fully completing booting of
secondary CPU (as explicitly mentioned in the comment above the call to
ia64_sync_itc()). Luckily this won't pose much of a problem because it
is in post-online stage (and hence CPU_STARTING notifications have been
sent and cpu_online_mask is setup already) and moreover, we were going to
enable the interrupts shortly anyway.
Signed-off-by: Nikunj A. Dadhania <nikunj@...ux.vnet.ibm.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Howells <dhowells@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Mike Frysinger <vapier@...too.org>
Cc: linux-ia64@...r.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
arch/ia64/kernel/irq_ia64.c | 16 ++++++++++++++++
arch/ia64/kernel/smpboot.c | 40 ++++++++++++++++++++++------------------
2 files changed, 38 insertions(+), 18 deletions(-)
diff --git a/arch/ia64/kernel/irq_ia64.c b/arch/ia64/kernel/irq_ia64.c
index 6ac99c8..6a724f9 100644
--- a/arch/ia64/kernel/irq_ia64.c
+++ b/arch/ia64/kernel/irq_ia64.c
@@ -196,6 +196,22 @@ static void clear_irq_vector(int irq)
spin_unlock_irqrestore(&vector_lock, flags);
}
+/*
+ * We need to hold vector_lock while manipulating cpu_online_mask so that the
+ * set of online cpus does not change while we are assigning vectors to cpus
+ * (assign_irq_vector()). Holding this lock ensures we don't half assign or
+ * remove an irq from a cpu.
+ */
+void arch_vector_lock(void)
+{
+ spin_lock(&vector_lock);
+}
+
+void arch_vector_unlock(void)
+{
+ spin_unlock(&vector_lock);
+}
+
int
ia64_native_assign_irq_vector (int irq)
{
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 709ce07..0f00dc6 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -351,18 +351,10 @@ smp_setup_percpu_timer (void)
static void __cpuinit
smp_callin (void)
{
- int cpuid, phys_id, itc_master;
- struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo;
- extern void ia64_init_itm(void);
- extern volatile int time_keeper_id;
-
-#ifdef CONFIG_PERFMON
- extern void pfm_init_percpu(void);
-#endif
+ unsigned int cpuid, phys_id;
cpuid = smp_processor_id();
phys_id = hard_smp_processor_id();
- itc_master = time_keeper_id;
if (cpu_online(cpuid)) {
printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n",
@@ -380,11 +372,21 @@ smp_callin (void)
/* Setup the per cpu irq handling data structures */
__setup_vector_irq(cpuid);
- notify_cpu_starting(cpuid);
- spin_lock(&vector_lock);
- set_cpu_online(cpuid, true);
- per_cpu(cpu_state, cpuid) = CPU_ONLINE;
- spin_unlock(&vector_lock);
+}
+
+void __cpuinit __cpu_post_online(void *unused)
+{
+ unsigned int cpuid, itc_master;
+ struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo;
+ extern void ia64_init_itm(void);
+ extern volatile int time_keeper_id;
+
+#ifdef CONFIG_PERFMON
+ extern void pfm_init_percpu(void);
+#endif
+
+ cpuid = smp_processor_id();
+ itc_master = time_keeper_id;
smp_setup_percpu_timer();
@@ -442,6 +444,12 @@ smp_callin (void)
int __cpuinit
start_secondary (void *unused)
{
+ smpboot_start_secondary(unused);
+ return 0;
+}
+
+void __cpuinit __cpu_pre_starting(void *unused)
+{
/* Early console may use I/O ports */
ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase));
#ifndef CONFIG_PRINTK_TIME
@@ -449,11 +457,7 @@ start_secondary (void *unused)
#endif
efi_map_pal_code();
cpu_init();
- preempt_disable();
smp_callin();
-
- cpu_idle();
- return 0;
}
struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs)
--
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