Re: [Xen-devel] [PATCH 6/6] xentrace: ARM platform timestamp support

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Mar 16, 2016 at 01:51:39PM -0700, Benjamin Sanda wrote:
> From: bensanda <ben.sanda@xxxxxxxxxxxxxxx>
> 
> Modified to provide support for xentrace on the ARM platform. Changed 
> get_cycles() to return the core timestamp tick count for use by the trace 
> buffer timestamping routines in xentrace.
> 
> Signed-off-by: Benjamin Sanda <ben.sanda@xxxxxxxxxxxxxxx>

That is missing the CC to Stefano or Julien. CC-ing them.
> ---
>  xen/include/asm-arm/time.h | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/xen/include/asm-arm/time.h b/xen/include/asm-arm/time.h
> index 5b9a31d..f3a22d5 100644
> --- a/xen/include/asm-arm/time.h
> +++ b/xen/include/asm-arm/time.h
> @@ -1,15 +1,21 @@
>  #ifndef __ARM_TIME_H__
>  #define __ARM_TIME_H__
>  
> +#include <asm/regs.h>
> +
>  #define DT_MATCH_TIMER                      \
>      DT_MATCH_COMPATIBLE("arm,armv7-timer"), \
>      DT_MATCH_COMPATIBLE("arm,armv8-timer")
>  
> -typedef unsigned long cycles_t;
> +/* Counter value at boot time */
> +extern uint64_t boot_count;
> +
> +typedef uint64_t cycles_t;
>  
>  static inline cycles_t get_cycles (void)
>  {
> -        return 0;
> +        /* return raw tick count of main timer */
> +        return READ_SYSREG64(CNTPCT_EL0) - boot_count;
>  }
>  
>  /* List of timer's IRQ */
> @@ -34,9 +40,6 @@ unsigned int timer_get_irq(enum timer_ppi ppi);
>  /* Set up the timer interrupt on this CPU */
>  extern void init_timer_interrupt(void);
>  
> -/* Counter value at boot time */
> -extern uint64_t boot_count;
> -
>  extern s_time_t ticks_to_ns(uint64_t ticks);
>  extern uint64_t ns_to_ticks(s_time_t ns);
>  
> -- 
> 2.7.2
> 
> 
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