[v2] powerpc/kernel/sysfs: cleanup set up macros for PMC/non-PMC sprs

Currently PMC (Performance Monitor Counter) setup macros are used
for other sprs. Since not all sprs are PMC related, this patch
modifies the exisiting macro and uses it to setup both PMC and
non PMC sprs accordingly.

V2 changes:

1) Modified SYSFS_PMCSETUP to a generic macro with additional parameter
2) Added PMC and SPR macro to call the generic macro
3) Changes in the comment to explain better.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/sysfs.c |   73 +++++++++++++++++++++++--------------------
 1 file changed, 39 insertions(+), 34 deletions(-)

--
1.7.10.4

On Tue, Oct 01, 2013 at 02:53:13PM +0530, Madhavan Srinivasan wrote:
> Currently PMC (Performance Monitor Counter) setup macros are used
> for other sprs. Since not all sprs are PMC related, this patch
> modifies the exisiting macro and uses it to setup both PMC and
> non PMC sprs accordingly.

"SPR" and "SPRs" :)

Also you should add olof@lixom.net to CC as he is the maintainer of the
pasemi platform, which most of the SPRs you're changing are for (PA6T).

> diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
> index 27a90b9..cb971c4 100644
> --- a/arch/powerpc/kernel/sysfs.c
> +++ b/arch/powerpc/kernel/sysfs.c
> @@ -107,14 +107,14 @@ void ppc_enable_pmcs(void)
>  }
>  EXPORT_SYMBOL(ppc_enable_pmcs);
> 
> -#define SYSFS_PMCSETUP(NAME, ADDRESS) \
> +#define _SYSFS_SPRSETUP(NAME, ADDRESS, EXTRA) \

Usual style for this would be a double leading underscore, eg:

> +#define __SYSFS_SPRSETUP(NAME, ADDRESS, EXTRA) \

>  static void read_##NAME(void *val) \
>  { \
>  	*(unsigned long *)val = mfspr(ADDRESS);	\
>  } \
>  static void write_##NAME(void *val) \
>  { \
> -	ppc_enable_pmcs(); \
> +	EXTRA; \
>  	mtspr(ADDRESS, *(unsigned long *)val);	\
>  } \
>  static ssize_t show_##NAME(struct device *dev, \
> @@ -139,6 +139,11 @@ static ssize_t __used \
>  	return count; \
>  }
> 
> +#define SYSFS_EMPTY

You shouldn't need this.

> +#define SYSFS_PMCSETUP(NAME, ADDRESS)	\
> +	_SYSFS_SPRSETUP(NAME, ADDRESS, ppc_enable_pmcs())
> +#define SYSFS_SPRSETUP(NAME, ADDRESS)	\
> +	_SYSFS_SPRSETUP(NAME, ADDRESS, SYSFS_EMPTY)

Just passing "" should work.

> 
>  /* Let's define all possible registers, we'll only hook up the ones
>   * that are implemented on the current processor
> @@ -174,10 +179,10 @@ SYSFS_PMCSETUP(pmc7, SPRN_PMC7);
>  SYSFS_PMCSETUP(pmc8, SPRN_PMC8);
> 
>  SYSFS_PMCSETUP(mmcra, SPRN_MMCRA);
> -SYSFS_PMCSETUP(purr, SPRN_PURR);
> -SYSFS_PMCSETUP(spurr, SPRN_SPURR);
> -SYSFS_PMCSETUP(dscr, SPRN_DSCR);
> -SYSFS_PMCSETUP(pir, SPRN_PIR);
> +SYSFS_SPRSETUP(purr, SPRN_PURR);
> +SYSFS_SPRSETUP(spurr, SPRN_SPURR);
> +SYSFS_SPRSETUP(dscr, SPRN_DSCR);
> +SYSFS_SPRSETUP(pir, SPRN_PIR);
> 
>  static DEVICE_ATTR(mmcra, 0600, show_mmcra, store_mmcra);
>  static DEVICE_ATTR(spurr, 0400, show_spurr, NULL);
> @@ -238,34 +243,34 @@ SYSFS_PMCSETUP(pa6t_pmc3, SPRN_PA6T_PMC3);
>  SYSFS_PMCSETUP(pa6t_pmc4, SPRN_PA6T_PMC4);
>  SYSFS_PMCSETUP(pa6t_pmc5, SPRN_PA6T_PMC5);
>  #ifdef CONFIG_DEBUG_KERNEL
> -SYSFS_PMCSETUP(hid0, SPRN_HID0);
> -SYSFS_PMCSETUP(hid1, SPRN_HID1);
> -SYSFS_PMCSETUP(hid4, SPRN_HID4);
> -SYSFS_PMCSETUP(hid5, SPRN_HID5);
> -SYSFS_PMCSETUP(ima0, SPRN_PA6T_IMA0);
> -SYSFS_PMCSETUP(ima1, SPRN_PA6T_IMA1);
> -SYSFS_PMCSETUP(ima2, SPRN_PA6T_IMA2);
> -SYSFS_PMCSETUP(ima3, SPRN_PA6T_IMA3);
> -SYSFS_PMCSETUP(ima4, SPRN_PA6T_IMA4);
> -SYSFS_PMCSETUP(ima5, SPRN_PA6T_IMA5);
> -SYSFS_PMCSETUP(ima6, SPRN_PA6T_IMA6);
> -SYSFS_PMCSETUP(ima7, SPRN_PA6T_IMA7);
> -SYSFS_PMCSETUP(ima8, SPRN_PA6T_IMA8);
> -SYSFS_PMCSETUP(ima9, SPRN_PA6T_IMA9);
> -SYSFS_PMCSETUP(imaat, SPRN_PA6T_IMAAT);
> -SYSFS_PMCSETUP(btcr, SPRN_PA6T_BTCR);
> -SYSFS_PMCSETUP(pccr, SPRN_PA6T_PCCR);
> -SYSFS_PMCSETUP(rpccr, SPRN_PA6T_RPCCR);
> -SYSFS_PMCSETUP(der, SPRN_PA6T_DER);
> -SYSFS_PMCSETUP(mer, SPRN_PA6T_MER);
> -SYSFS_PMCSETUP(ber, SPRN_PA6T_BER);
> -SYSFS_PMCSETUP(ier, SPRN_PA6T_IER);
> -SYSFS_PMCSETUP(sier, SPRN_PA6T_SIER);
> -SYSFS_PMCSETUP(siar, SPRN_PA6T_SIAR);
> -SYSFS_PMCSETUP(tsr0, SPRN_PA6T_TSR0);
> -SYSFS_PMCSETUP(tsr1, SPRN_PA6T_TSR1);
> -SYSFS_PMCSETUP(tsr2, SPRN_PA6T_TSR2);
> -SYSFS_PMCSETUP(tsr3, SPRN_PA6T_TSR3);
> +SYSFS_SPRSETUP(hid0, SPRN_HID0);
> +SYSFS_SPRSETUP(hid1, SPRN_HID1);
> +SYSFS_SPRSETUP(hid4, SPRN_HID4);
> +SYSFS_SPRSETUP(hid5, SPRN_HID5);
> +SYSFS_SPRSETUP(ima0, SPRN_PA6T_IMA0);
> +SYSFS_SPRSETUP(ima1, SPRN_PA6T_IMA1);
> +SYSFS_SPRSETUP(ima2, SPRN_PA6T_IMA2);
> +SYSFS_SPRSETUP(ima3, SPRN_PA6T_IMA3);
> +SYSFS_SPRSETUP(ima4, SPRN_PA6T_IMA4);
> +SYSFS_SPRSETUP(ima5, SPRN_PA6T_IMA5);
> +SYSFS_SPRSETUP(ima6, SPRN_PA6T_IMA6);
> +SYSFS_SPRSETUP(ima7, SPRN_PA6T_IMA7);
> +SYSFS_SPRSETUP(ima8, SPRN_PA6T_IMA8);
> +SYSFS_SPRSETUP(ima9, SPRN_PA6T_IMA9);
> +SYSFS_SPRSETUP(imaat, SPRN_PA6T_IMAAT);
> +SYSFS_SPRSETUP(btcr, SPRN_PA6T_BTCR);
> +SYSFS_SPRSETUP(pccr, SPRN_PA6T_PCCR);
> +SYSFS_SPRSETUP(rpccr, SPRN_PA6T_RPCCR);
> +SYSFS_SPRSETUP(der, SPRN_PA6T_DER);
> +SYSFS_SPRSETUP(mer, SPRN_PA6T_MER);
> +SYSFS_SPRSETUP(ber, SPRN_PA6T_BER);
> +SYSFS_SPRSETUP(ier, SPRN_PA6T_IER);
> +SYSFS_SPRSETUP(sier, SPRN_PA6T_SIER);
> +SYSFS_SPRSETUP(siar, SPRN_PA6T_SIAR);
> +SYSFS_SPRSETUP(tsr0, SPRN_PA6T_TSR0);
> +SYSFS_SPRSETUP(tsr1, SPRN_PA6T_TSR1);
> +SYSFS_SPRSETUP(tsr2, SPRN_PA6T_TSR2);
> +SYSFS_SPRSETUP(tsr3, SPRN_PA6T_TSR3);
>  #endif /* CONFIG_DEBUG_KERNEL */
>  #endif /* HAS_PPC_PMC_PA6T */
> 
> --
> 1.7.10.4
>