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Date: Tue, 27 Mar 2007 15:09:40 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>,
Virtualization Mailing List <virtualization@...ts.osdl.org>,
Xen-devel <xen-devel@...ts.xensource.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Zachary Amsden <zach@...are.com>
Subject: [PATCH] Add smp_ops interface
Add a smp_ops interface. This abstracts the API defined by
<linux/smp.h> for use within arch/i386. The primary intent is that it
be used by a paravirtualizing hypervisor to implement SMP, but it
could also be used by non-APIC-using sub-architectures.
This is related to CONFIG_PARAVIRT, but is implemented unconditionally
since it is simpler that way and not a highly performance-sensitive
interface.
[ Andrew: Patch is based on 2.6.21-rc5-mm1 + the pda->percpu patch I
posted the other day. It will have a minor context conflict without
that patch, but is otherwise standalone. ]
Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
Cc: Andi Kleen <ak@...e.de>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: James Bottomley <James.Bottomley@...senPartnership.com>
---
arch/i386/kernel/smp.c | 21 +++++++++++++----
arch/i386/kernel/smpboot.c | 8 +++---
include/asm-i386/smp.h | 53 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 73 insertions(+), 9 deletions(-)
===================================================================
--- a/arch/i386/kernel/smp.c
+++ b/arch/i386/kernel/smp.c
@@ -483,7 +483,7 @@ void flush_tlb_all(void)
* it goes straight through and wastes no time serializing
* anything. Worst case is that we lose a reschedule ...
*/
-void smp_send_reschedule(int cpu)
+void native_smp_send_reschedule(int cpu)
{
WARN_ON(cpu_is_offline(cpu));
send_IPI_mask(cpumask_of_cpu(cpu), RESCHEDULE_VECTOR);
@@ -576,9 +576,9 @@ static int __smp_call_function_mask(cpum
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler.
*/
-int smp_call_function_mask(cpumask_t mask,
- void (*func)(void *), void *info,
- int wait)
+int native_smp_call_function_mask(cpumask_t mask,
+ void (*func)(void *), void *info,
+ int wait)
{
int ret;
@@ -657,7 +657,7 @@ static void stop_this_cpu (void * dummy)
* this function calls the 'stop' function on all other CPUs in the system.
*/
-void smp_send_stop(void)
+void native_smp_send_stop(void)
{
/* Don't deadlock on the call lock in panic */
int nolock = !spin_trylock(&call_lock);
@@ -733,3 +733,14 @@ int safe_smp_processor_id(void)
return cpuid >= 0 ? cpuid : 0;
}
+
+struct smp_ops smp_ops = {
+ .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
+ .smp_prepare_cpus = native_smp_prepare_cpus,
+ .cpu_up = native_cpu_up,
+ .smp_cpus_done = native_smp_cpus_done,
+
+ .smp_send_stop = native_smp_send_stop,
+ .smp_send_reschedule = native_smp_send_reschedule,
+ .smp_call_function_mask = native_smp_call_function_mask,
+};
===================================================================
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -1169,7 +1169,7 @@ static void __init smp_boot_cpus(unsigne
/* These are wrappers to interface to the new boot process. Someone
who understands all this stuff should rewrite it properly. --RR 15/Jul/02 */
-void __init smp_prepare_cpus(unsigned int max_cpus)
+void __init native_smp_prepare_cpus(unsigned int max_cpus)
{
smp_commenced_mask = cpumask_of_cpu(0);
cpu_callin_map = cpumask_of_cpu(0);
@@ -1189,7 +1189,7 @@ static inline void switch_to_new_gdt(voi
asm ("mov %0, %%fs" : : "r" (__KERNEL_PERCPU) : "memory");
}
-void __init smp_prepare_boot_cpu(void)
+void __init native_smp_prepare_boot_cpu(void)
{
unsigned int cpu = smp_processor_id();
@@ -1290,7 +1290,7 @@ void __cpu_die(unsigned int cpu)
}
#endif /* CONFIG_HOTPLUG_CPU */
-int __cpuinit __cpu_up(unsigned int cpu)
+int __cpuinit native_cpu_up(unsigned int cpu)
{
unsigned long flags;
#ifdef CONFIG_HOTPLUG_CPU
@@ -1335,7 +1335,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
return 0;
}
-void __init smp_cpus_done(unsigned int max_cpus)
+void __init native_smp_cpus_done(unsigned int max_cpus)
{
#ifdef CONFIG_X86_IO_APIC
setup_ioapic_dest();
===================================================================
--- a/include/asm-i386/smp.h
+++ b/include/asm-i386/smp.h
@@ -47,6 +47,59 @@ extern void cpu_exit_clear(void);
extern void cpu_exit_clear(void);
extern void cpu_uninit(void);
#endif
+
+struct smp_ops
+{
+ void (*smp_prepare_boot_cpu)(void);
+ void (*smp_prepare_cpus)(unsigned max_cpus);
+ int (*cpu_up)(unsigned cpu);
+ void (*smp_cpus_done)(unsigned max_cpus);
+
+ void (*smp_send_stop)(void);
+ void (*smp_send_reschedule)(int cpu);
+ int (*smp_call_function_mask)(cpumask_t mask,
+ void (*func)(void *info), void *info,
+ int wait);
+};
+
+extern struct smp_ops smp_ops;
+
+static inline void smp_prepare_boot_cpu(void)
+{
+ smp_ops.smp_prepare_boot_cpu();
+}
+static inline void smp_prepare_cpus(unsigned int max_cpus)
+{
+ smp_ops.smp_prepare_cpus(max_cpus);
+}
+static inline int __cpu_up(unsigned int cpu)
+{
+ return smp_ops.cpu_up(cpu);
+}
+static inline void smp_cpus_done(unsigned int max_cpus)
+{
+ smp_ops.smp_cpus_done(max_cpus);
+}
+
+static inline void smp_send_stop(void)
+{
+ smp_ops.smp_send_stop();
+}
+static inline void smp_send_reschedule(int cpu)
+{
+ smp_ops.smp_send_reschedule(cpu);
+}
+static inline int smp_call_function_mask(cpumask_t mask,
+ void (*func) (void *info), void *info,
+ int wait)
+{
+ return smp_ops.smp_call_function_mask(mask, func, info, wait);
+}
+
+void native_smp_prepare_boot_cpu(void);
+void native_smp_prepare_cpus(unsigned int max_cpus);
+int native_cpu_up(unsigned int cpunum);
+void native_smp_cpus_done(unsigned int max_cpus);
#ifndef CONFIG_PARAVIRT
#define startup_ipi_hook(phys_apicid, start_eip, start_esp) \
-
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