From: Kevin Hilman <khilman@mvista.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.18-rt7 1/1] ARM: add latency timing support
Date: Tue, 07 Nov 2006 08:43:38 -0800 [thread overview]
Message-ID: <4550B7BA.7080906@mvista.com> (raw)
In-Reply-To: <20061107002140.662370000@mvista.com>
[-- Attachment #1: Type: text/plain, Size: 244 bytes --]
Kevin Hilman wrote:
> Add latency-timing support for IXP4xx.
On second thought, here's a better patch that will cover all ARM
subarches. Each sub-arch only has to implement mach_get_cycles()
Signed-off-by: Kevin Hilman <khilman@mvista.com>
[-- Attachment #2: arm_latency_timing.patch --]
[-- Type: text/x-patch, Size: 1616 bytes --]
Index: linux-2.6.18/include/asm-arm/arch-ixp4xx/timex.h
===================================================================
--- linux-2.6.18.orig/include/asm-arm/arch-ixp4xx/timex.h
+++ linux-2.6.18/include/asm-arm/arch-ixp4xx/timex.h
@@ -13,3 +13,5 @@
#define FREQ 66666666
#define CLOCK_TICK_RATE (((FREQ / HZ & ~IXP4XX_OST_RELOAD_MASK) + 1) * HZ)
+extern u64 ixp4xx_get_cycles(void);
+#define mach_read_cycles() ixp4xx_get_cycles()
Index: linux-2.6.18/include/asm-arm/timex.h
===================================================================
--- linux-2.6.18.orig/include/asm-arm/timex.h
+++ linux-2.6.18/include/asm-arm/timex.h
@@ -18,10 +18,13 @@ typedef unsigned long cycles_t;
#ifndef mach_read_cycles
#define mach_read_cycles() (0)
-#ifdef CONFIG_LATENCY_TIMING
- #define mach_cycles_to_usecs(d) (d)
- #define mach_usecs_to_cycles(d) (d)
#endif
+
+#ifdef CONFIG_LATENCY_TIMING
+ #define mach_cycles_to_usecs(d) \
+ (((d) * ((1000000LL << 32) / CLOCK_TICK_RATE)) >> 32)
+ #define mach_usecs_to_cycles(d) \
+ (((d) * (((long long)CLOCK_TICK_RATE << 32) / 1000000)) >> 32)
#endif
static inline cycles_t get_cycles (void)
Index: linux-2.6.18/include/asm-arm/arch-pxa/timex.h
===================================================================
--- linux-2.6.18.orig/include/asm-arm/arch-pxa/timex.h
+++ linux-2.6.18/include/asm-arm/arch-pxa/timex.h
@@ -26,5 +26,3 @@
#endif
#define mach_read_cycles() OSCR
-#define mach_cycles_to_usecs(d) (((d) * ((1000000LL << 32) / CLOCK_TICK_RATE)) >> 32)
-#define mach_usecs_to_cycles(d) (((d) * (((long long)CLOCK_TICK_RATE << 32) / 1000000)) >> 32)
prev parent reply other threads:[~2006-11-07 16:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-07 0:21 [PATCH 2.6.18-rt7 1/1] ARM: add latency timing support Kevin Hilman
2006-11-07 16:43 ` Kevin Hilman [this message]
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