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Date: Tue, 14 Apr 2009 10:51:27 -0500
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...ux.intel.com>,
Ingo Molnar <mingo@...e.hu>,
James Bottomley <James.Bottomley@...senPartnership.com>
Subject: [PATCH 01/14] [VOYAGER] x86: add {safe,hard}_smp_processor_id to smp_ops
Not having apics, Voyager can't use the default apic implementation of
these, it has to read from a special port in the VIC to get the
processor ID, so abstract these functions in smp_ops to allow voyager
to live simultaneously with the apic code.
Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
---
arch/x86/include/asm/smp.h | 13 +++++++++++--
arch/x86/kernel/apic/apic.c | 5 -----
arch/x86/kernel/apic/ipi.c | 2 +-
arch/x86/kernel/smp.c | 7 +++++++
arch/x86/xen/smp.c | 7 +++++++
5 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 19e0d88..aac866f 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -60,6 +60,8 @@ struct smp_ops {
void (*send_call_func_ipi)(const struct cpumask *mask);
void (*send_call_func_single_ipi)(int cpu);
+ int (*hard_smp_processor_id)(void);
+ int (*safe_smp_processor_id)(void);
};
/* Globals due to paravirt */
@@ -159,7 +161,11 @@ extern unsigned disabled_cpus __cpuinitdata;
* so this is correct in the x86 case.
*/
#define raw_smp_processor_id() (percpu_read(cpu_number))
-extern int safe_smp_processor_id(void);
+int apic_safe_smp_processor_id(void);
+static inline int safe_smp_processor_id(void)
+{
+ return smp_ops.safe_smp_processor_id();
+}
#elif defined(CONFIG_X86_64_SMP)
#define raw_smp_processor_id() (percpu_read(cpu_number))
@@ -185,7 +191,10 @@ static inline int logical_smp_processor_id(void)
#endif
-extern int hard_smp_processor_id(void);
+static inline int hard_smp_processor_id(void)
+{
+ return smp_ops.hard_smp_processor_id();
+}
#else /* CONFIG_X86_LOCAL_APIC */
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index f287092..f9e830e 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1885,11 +1885,6 @@ void __cpuinit generic_processor_info(int apicid, int version)
set_cpu_present(cpu, true);
}
-int hard_smp_processor_id(void)
-{
- return read_apic_id();
-}
-
void default_init_apic_ldr(void)
{
unsigned long val;
diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c
index dbf5445..90bb775 100644
--- a/arch/x86/kernel/apic/ipi.c
+++ b/arch/x86/kernel/apic/ipi.c
@@ -146,7 +146,7 @@ static int convert_apicid_to_cpu(int apic_id)
return -1;
}
-int safe_smp_processor_id(void)
+int apic_safe_smp_processor_id(void)
{
int apicid, cpuid;
diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index 13f33ea..29d0af7 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -192,6 +192,11 @@ void smp_call_function_single_interrupt(struct pt_regs *regs)
irq_exit();
}
+static int native_hard_smp_processor_id(void)
+{
+ return read_apic_id();
+}
+
struct smp_ops smp_ops = {
.smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
.smp_prepare_cpus = native_smp_prepare_cpus,
@@ -207,5 +212,7 @@ struct smp_ops smp_ops = {
.send_call_func_ipi = native_send_call_func_ipi,
.send_call_func_single_ipi = native_send_call_func_single_ipi,
+ .hard_smp_processor_id = native_hard_smp_processor_id,
+ .safe_smp_processor_id = apic_safe_smp_processor_id,
};
EXPORT_SYMBOL_GPL(smp_ops);
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 429834e..eb795bf 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -454,6 +454,11 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int xen_hard_smp_processor_id(void)
+{
+ return read_apic_id();
+}
+
static const struct smp_ops xen_smp_ops __initdata = {
.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
.smp_prepare_cpus = xen_smp_prepare_cpus,
@@ -469,6 +474,8 @@ static const struct smp_ops xen_smp_ops __initdata = {
.send_call_func_ipi = xen_smp_send_call_function_ipi,
.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
+ .hard_smp_processor_id = xen_hard_smp_processor_id,
+ .safe_smp_processor_id = apic_safe_smp_processor_id,
};
void __init xen_smp_init(void)
--
1.6.2.1
--
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