[Xen-devel] RE: [PATCH 3/8] x86/acpi/sleep: Provide registration for acpi_suspend_lowlevel.

["Cihula, Joseph" <joseph.cihula@xxxxxxxxx>]

ACK

> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Thursday, September 29, 2011 1:17 PM
> To: linux-kernel@xxxxxxxxxxxxxxx; rjw@xxxxxxx; tglx@xxxxxxxxxxxxx; 
> hpa@xxxxxxxxx; x86@xxxxxxxxxx;
> Brown, Len; Cihula, Joseph; Wang, Shane; xen-devel@xxxxxxxxxxxxxxxxxxx; 
> linux-pm@xxxxxxxxxxxx
> foundation.org; tboot-devel@xxxxxxxxxxxxxxxxxxxxx; linux-acpi@xxxxxxxxxxxxxxx;
> liang.tang@xxxxxxxxxx; Yu, Ke; Tian, Kevin; jeremy@xxxxxxxx
> Cc: Konrad Rzeszutek Wilk
> Subject: [PATCH 3/8] x86/acpi/sleep: Provide registration for 
> acpi_suspend_lowlevel.
> 
> From: Liang Tang <liang.tang@xxxxxxxxxx>
> 
> Which by default will be x86_acpi_suspend_lowlevel.
> This registration allows us to register another callback if there is a need 
> to use another
> platform specific callback.
> 
> CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
> CC: x86@xxxxxxxxxx
> CC: Len Brown <len.brown@xxxxxxxxx>
> CC: Joseph Cihula <joseph.cihula@xxxxxxxxx>
> CC: Shane Wang <shane.wang@xxxxxxxxx>
> CC: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
> CC: linux-acpi@xxxxxxxxxxxxxxx
> CC: Len Brown <len.brown@xxxxxxxxx>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Signed-off-by: Liang Tang <liang.tang@xxxxxxxxxx>
> ---
>  arch/x86/include/asm/acpi.h  |    2 +-
>  arch/x86/kernel/acpi/boot.c  |    2 ++
>  arch/x86/kernel/acpi/sleep.c |    4 ++--
>  arch/x86/kernel/acpi/sleep.h |    2 ++
>  drivers/acpi/sleep.c         |    2 ++
>  5 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index 
> 0a46696..9b538dc
> 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -119,7 +119,7 @@ static inline void acpi_disable_pci(void)  }
> 
>  /* Low-level suspend routine. */
> -extern int acpi_suspend_lowlevel(void);
> +extern int (*acpi_suspend_lowlevel)(void);
> 
>  extern const unsigned char acpi_wakeup_code[];  #define acpi_wakeup_address
> (__pa(TRAMPOLINE_SYM(acpi_wakeup_code)))
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 
> 7f30806..ddd081b
> 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -44,6 +44,7 @@
>  #include <asm/mpspec.h>
>  #include <asm/smp.h>
> 
> +#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
>  static int __initdata acpi_force = 0;
>  u32 acpi_rsdt_forced;
>  int acpi_disabled;
> @@ -556,6 +557,7 @@ int (*__acpi_override_sleep)(u8 sleep_state, u32 
> pm1a_ctrl,
>                            u32 pm1b_ctrl, bool *skip_rest) \
>                          __attribute__ ((unused)) = NULL;
> 
> +int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
>  /*
>   * success: return IRQ number (>=0)
>   * failure: return < 0
> diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c 
> index 103b6ab..4d2d0b1
> 100644
> --- a/arch/x86/kernel/acpi/sleep.c
> +++ b/arch/x86/kernel/acpi/sleep.c
> @@ -25,12 +25,12 @@ static char temp_stack[4096];  #endif
> 
>  /**
> - * acpi_suspend_lowlevel - save kernel state
> + * x86_acpi_suspend_lowlevel - save kernel state
>   *
>   * Create an identity mapped page table and copy the wakeup routine to
>   * low memory.
>   */
> -int acpi_suspend_lowlevel(void)
> +int x86_acpi_suspend_lowlevel(void)
>  {
>       struct wakeup_header *header;
>       /* address in low memory of the wakeup routine. */ diff --git 
> a/arch/x86/kernel/acpi/sleep.h
> b/arch/x86/kernel/acpi/sleep.h index 416d4be..4d3feb5 100644
> --- a/arch/x86/kernel/acpi/sleep.h
> +++ b/arch/x86/kernel/acpi/sleep.h
> @@ -13,3 +13,5 @@ extern unsigned long acpi_copy_wakeup_routine(unsigned 
> long);  extern void
> wakeup_long64(void);
> 
>  extern void do_suspend_lowlevel(void);
> +
> +extern int x86_acpi_suspend_lowlevel(void);
> diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index 
> 3ed80b2..3570c00 100644
> --- a/drivers/acpi/sleep.c
> +++ b/drivers/acpi/sleep.c
> @@ -254,6 +254,8 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
>               break;
> 
>       case ACPI_STATE_S3:
> +             if (!acpi_suspend_lowlevel)
> +                     return -ENODEV;
>               error = acpi_suspend_lowlevel();
>               if (error)
>                       return error;
> --
> 1.7.4.1


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