From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 12 Jan 2006 09:05:27 +0000 (-0800)
Subject: [PATCH] sched: add cacheflush() asm
X-Git-Tag: v2.6.16-rc1~276
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4dc7a0bbeb6882ad665e588e82fabe5bb4645f2f;p=linux-2.6

[PATCH] sched: add cacheflush() asm

Add per-arch sched_cacheflush() which is a write-back cacheflush used by
the migration-cost calibration code at bootup time.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index c33305d8e5..d91c8ff2c0 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -60,6 +60,7 @@
 #include <asm/smp.h>
 #include <asm/system.h>
 #include <asm/unistd.h>
+#include <asm/system.h>
 
 #if defined(CONFIG_SMP) && (IA64_CPU_SIZE > PAGE_SIZE)
 # error "struct cpuinfo_ia64 too big!"
@@ -870,6 +871,15 @@ cpu_init (void)
 	pm_idle = default_idle;
 }
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ */
+void sched_cacheflush(void)
+{
+	ia64_sal_cache_flush(3);
+}
+
 void
 check_bugs (void)
 {
diff --git a/include/asm-alpha/system.h b/include/asm-alpha/system.h
index 050e86d128..766ab868e8 100644
--- a/include/asm-alpha/system.h
+++ b/include/asm-alpha/system.h
@@ -140,6 +140,16 @@ extern void halt(void) __attribute__((noreturn));
 struct task_struct;
 extern struct task_struct *alpha_switch_to(unsigned long, struct task_struct*);
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 #define imb() \
 __asm__ __volatile__ ("call_pal %0 #imb" : : "i" (PAL_imb) : "memory")
 
diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index 5621d61ebc..0497171df8 100644
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -171,6 +171,16 @@ do {									\
 	last = __switch_to(prev,prev->thread_info,next->thread_info);	\
 } while (0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 /*
  * CPU interrupt mask handling.
  */
diff --git a/include/asm-arm26/system.h b/include/asm-arm26/system.h
index f23fac1938..1bce6b3590 100644
--- a/include/asm-arm26/system.h
+++ b/include/asm-arm26/system.h
@@ -114,6 +114,16 @@ do {									\
 	last = __switch_to(prev,prev->thread_info,next->thread_info);	\
 } while (0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 /*
  * Save the current interrupt enable state & disable IRQs
  */
diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h
index 9c0593b7a9..36a92ed6a9 100644
--- a/include/asm-i386/system.h
+++ b/include/asm-i386/system.h
@@ -548,6 +548,15 @@ void enable_hlt(void);
 extern int es7000_plat;
 void cpu_idle_wait(void);
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible:
+ */
+static inline void sched_cacheflush(void)
+{
+	wbinvd();
+}
+
 extern unsigned long arch_align_stack(unsigned long sp);
 
 #endif
diff --git a/include/asm-ia64/system.h b/include/asm-ia64/system.h
index 635235fa1e..510c31c507 100644
--- a/include/asm-ia64/system.h
+++ b/include/asm-ia64/system.h
@@ -279,6 +279,7 @@ extern void ia64_load_extra (struct task_struct *task);
 #define ia64_platform_is(x) (strcmp(x, platform_name) == 0)
 
 void cpu_idle_wait(void);
+void sched_cacheflush(void);
 
 #define arch_align_stack(x) (x)
 
diff --git a/include/asm-m32r/system.h b/include/asm-m32r/system.h
index dcf619a0a0..06c12a037c 100644
--- a/include/asm-m32r/system.h
+++ b/include/asm-m32r/system.h
@@ -68,6 +68,16 @@
 	last = __last; \
 } while(0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 /* Interrupt Control */
 #if !defined(CONFIG_CHIP_M32102) && !defined(CONFIG_CHIP_M32104)
 #define local_irq_enable() \
diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 330c4e497a..5f761ad5a8 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -164,6 +164,16 @@ do {									\
 		__restore_dsp(current);					\
 } while(0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
 {
 	__u32 retval;
diff --git a/include/asm-parisc/system.h b/include/asm-parisc/system.h
index f3928d3a80..a5a973c0c0 100644
--- a/include/asm-parisc/system.h
+++ b/include/asm-parisc/system.h
@@ -49,6 +49,15 @@ extern struct task_struct *_switch_to(struct task_struct *, struct task_struct *
 	(last) = _switch_to(prev, next);			\
 } while(0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
 
 
 /* interrupt control */
diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
index 0c58e32a95..1be629b4fb 100644
--- a/include/asm-powerpc/system.h
+++ b/include/asm-powerpc/system.h
@@ -175,6 +175,16 @@ struct thread_struct;
 extern struct task_struct *_switch(struct thread_struct *prev,
 				   struct thread_struct *next);
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 extern unsigned int rtas_data;
 extern int mem_init_done;	/* set on boot once kmalloc can be called */
 extern unsigned long memory_limit;
diff --git a/include/asm-ppc/system.h b/include/asm-ppc/system.h
index bd99cb53a1..212dca66fc 100644
--- a/include/asm-ppc/system.h
+++ b/include/asm-ppc/system.h
@@ -123,6 +123,16 @@ extern struct task_struct *__switch_to(struct task_struct *,
 	struct task_struct *);
 #define switch_to(prev, next, last)	((last) = __switch_to((prev), (next)))
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 struct thread_struct;
 extern struct task_struct *_switch(struct thread_struct *prev,
 				   struct thread_struct *next);
diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index 864cae7e1f..c7c3a9ad59 100644
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -104,6 +104,16 @@ static inline void restore_access_regs(unsigned int *acrs)
 	prev = __switch_to(prev,next);					     \
 } while (0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 extern void account_user_vtime(struct task_struct *);
 extern void account_system_vtime(struct task_struct *);
diff --git a/include/asm-sh/system.h b/include/asm-sh/system.h
index 28a3c2d8bc..bb0330499b 100644
--- a/include/asm-sh/system.h
+++ b/include/asm-sh/system.h
@@ -57,6 +57,16 @@
 	last = __last;							\
 } while (0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 #define nop() __asm__ __volatile__ ("nop")
 
 
diff --git a/include/asm-sparc/system.h b/include/asm-sparc/system.h
index 1f6b71f9e1..52fe2e464e 100644
--- a/include/asm-sparc/system.h
+++ b/include/asm-sparc/system.h
@@ -165,6 +165,16 @@ extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
 	  "o0", "o1", "o2", "o3",                   "o7");	\
 	} while(0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 /*
  * Changing the IRQ level on the Sparc.
  */
diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h
index 309f1466b6..07d72367f8 100644
--- a/include/asm-sparc64/system.h
+++ b/include/asm-sparc64/system.h
@@ -253,6 +253,16 @@ do {	if (test_thread_flag(TIF_PERFCTR)) {				\
 	}								\
 } while(0)
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
 static inline unsigned long xchg32(__volatile__ unsigned int *m, unsigned int val)
 {
 	unsigned long tmp1, tmp2;
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index 38c1e8a69c..0eacbefb7d 100644
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -193,6 +193,15 @@ static inline void write_cr4(unsigned long val)
 #define wbinvd() \
 	__asm__ __volatile__ ("wbinvd": : :"memory");
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ */
+static inline void sched_cacheflush(void)
+{
+	wbinvd();
+}
+
 #endif	/* __KERNEL__ */
 
 #define nop() __asm__ __volatile__ ("nop")