linux-kernel - Re: [PATCH] x86: let 32bit use apic

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Date:	Sat, 12 Jul 2008 18:08:43 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: let 32bit use apic_ops too

Yinghai,

We can now cleanup ack_APIC_irq() to use the native_apic_mem_write()
for both 32bit and 64bit

And also arch/x86/kernel/ipi.c can also use native_apic_mem_write()
similar to include/asm-x86/ipi.h

Then you will have my ACK :)

thanks,
suresh

On Fri, Jul 11, 2008 at 06:41:54PM -0700, Yinghai Lu wrote:
> 
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
> 
> ---
>  arch/x86/kernel/apic_32.c |   39 +++++++++++++++++++++++++++++++--------
>  include/asm-x86/apic.h    |   13 ++-----------
>  2 files changed, 33 insertions(+), 19 deletions(-)
> 
> Index: linux-2.6/arch/x86/kernel/apic_32.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/apic_32.c
> +++ linux-2.6/arch/x86/kernel/apic_32.c
> @@ -145,19 +145,13 @@ static int modern_apic(void)
>         return lapic_get_version() >= 0x14;
>  }
> 
> -void apic_icr_write(u32 low, u32 id)
> -{
> -       apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(id));
> -       apic_write_around(APIC_ICR, low);
> -}
> -
> -void apic_wait_icr_idle(void)
> +void xapic_wait_icr_idle(void)
>  {
>         while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
>                 cpu_relax();
>  }
> 
> -u32 safe_apic_wait_icr_idle(void)
> +u32 safe_xapic_wait_icr_idle(void)
>  {
>         u32 send_status;
>         int timeout;
> @@ -173,6 +167,35 @@ u32 safe_apic_wait_icr_idle(void)
>         return send_status;
>  }
> 
> +void xapic_icr_write(u32 low, u32 id)
> +{
> +       apic_write_around(APIC_ICR2, SET_APIC_DEST_FIELD(id));
> +       apic_write_around(APIC_ICR, low);
> +}
> +
> +u64 xapic_icr_read(void)
> +{
> +       u32 icr1, icr2;
> +
> +       icr2 = apic_read(APIC_ICR2);
> +       icr1 = apic_read(APIC_ICR);
> +
> +       return icr1 | ((u64)icr2 << 32);
> +}
> +
> +static struct apic_ops xapic_ops = {
> +       .read = native_apic_mem_read,
> +       .write = native_apic_mem_write,
> +       .write_atomic = native_apic_mem_write_atomic,
> +       .icr_read = xapic_icr_read,
> +       .icr_write = xapic_icr_write,
> +       .wait_icr_idle = xapic_wait_icr_idle,
> +       .safe_wait_icr_idle = safe_xapic_wait_icr_idle,
> +};
> +
> +struct apic_ops __read_mostly *apic_ops = &xapic_ops;
> +EXPORT_SYMBOL_GPL(apic_ops);
> +
>  /**
>   * enable_NMI_through_LVT0 - enable NMI through local vector table 0
>   */
> Index: linux-2.6/include/asm-x86/apic.h
> ===================================================================
> --- linux-2.6.orig/include/asm-x86/apic.h
> +++ linux-2.6/include/asm-x86/apic.h
> @@ -49,11 +49,6 @@ extern int disable_apic;
>  #ifdef CONFIG_PARAVIRT
>  #include <asm/paravirt.h>
>  #else
> -#ifndef CONFIG_X86_64
> -#define apic_write native_apic_mem_write
> -#define apic_write_atomic native_apic_mem_write_atomic
> -#define apic_read native_apic_mem_read
> -#endif
>  #define setup_boot_clock setup_boot_APIC_clock
>  #define setup_secondary_clock setup_secondary_APIC_clock
>  #endif
> @@ -95,16 +90,13 @@ static inline u32 native_apic_msr_read(u
>         return low;
>  }
> 
> -#ifdef CONFIG_X86_32
> -extern void apic_wait_icr_idle(void);
> -extern u32 safe_apic_wait_icr_idle(void);
> -extern void apic_icr_write(u32 low, u32 id);
> -#else
> +#ifndef CONFIG_X86_32
>  extern int x2apic, x2apic_preenabled;
>  extern void check_x2apic(void);
>  extern void enable_x2apic(void);
>  extern void enable_IR_x2apic(void);
>  extern void x2apic_icr_write(u32 low, u32 id);
> +#endif
> 
>  struct apic_ops {
>         u32 (*read)(u32 reg);
> @@ -125,7 +117,6 @@ extern struct apic_ops *apic_ops;
>  #define apic_icr_write (apic_ops->icr_write)
>  #define apic_wait_icr_idle (apic_ops->wait_icr_idle)
>  #define safe_apic_wait_icr_idle (apic_ops->safe_wait_icr_idle)
> -#endif
> 
>  extern int get_physical_broadcast(void);
--
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