[PATCH v2] powerpc: Add POWER10 raw mode cputable entry

[Christophe Leroy]

Le 14/08/2020 à 09:45, Madhavan Srinivasan a écrit :
> Add a raw mode cputable entry for POWER10. Copies most of the fields
> from commit a3ea40d5c736 ("powerpc: Add POWER10 architected mode")
> except for oprofile_cpu_type, machine_check_early, pvr_mask and pvr_mask
> fields. On bare metal systems we use DT CPU features, which doesn't need a
> cputable entry. But in VMs we still rely on the raw cputable entry to
> set the correct values for the PMU related fields.
> 
> Signed-off-by: Madhavan Srinivasan <maddy at linux.ibm.com>
> ---
> Changelog v1:
> - Fixed function undeclared compiler error.
> 
>   arch/powerpc/kernel/cputable.c | 20 ++++++++++++++++++++
>   1 file changed, 20 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
> index b4066354f0730..bb0c7f43a8283 100644
> --- a/arch/powerpc/kernel/cputable.c
> +++ b/arch/powerpc/kernel/cputable.c
> @@ -75,6 +75,7 @@ extern void __restore_cpu_power10(void);
>   extern long __machine_check_early_realmode_p7(struct pt_regs *regs);
>   extern long __machine_check_early_realmode_p8(struct pt_regs *regs);
>   extern long __machine_check_early_realmode_p9(struct pt_regs *regs);
> +extern long __machine_check_early_realmode_p10(struct pt_regs *regs);

'extern' keyword is useless and deprecated for function declaration. 
Please don't add new prototypes with that keyword.

Also, when you check arch/powerpc/kernel/mce_power.o with sparse, you 
get the following issues:

   CHECK   arch/powerpc/kernel/mce_power.c
arch/powerpc/kernel/mce_power.c:709:6: warning: symbol 
'__machine_check_early_realmode_p7' was not declared. Should it be static?
arch/powerpc/kernel/mce_power.c:717:6: warning: symbol 
'__machine_check_early_realmode_p8' was not declared. Should it be static?
arch/powerpc/kernel/mce_power.c:722:6: warning: symbol 
'__machine_check_early_realmode_p9' was not declared. Should it be static?
arch/powerpc/kernel/mce_power.c:740:6: warning: symbol 
'__machine_check_early_realmode_p10' was not declared. Should it be static?

This needs to be fixed by declaring the functions in a .h file that you 
include in both arch/powerpc/kernel/mce_power.c and 
arch/powerpc/kernel/cputable.c

Christophe

>   #endif /* CONFIG_PPC64 */
>   #if defined(CONFIG_E500)
>   extern void __setup_cpu_e5500(unsigned long offset, struct cpu_spec* spec);
> @@ -541,6 +542,25 @@ static struct cpu_spec __initdata cpu_specs[] = {
>   		.machine_check_early	= __machine_check_early_realmode_p9,
>   		.platform		= "power9",
>   	},
> +	{	/* Power10 */
> +		.pvr_mask		= 0xffff0000,
> +		.pvr_value		= 0x00800000,
> +		.cpu_name		= "POWER10 (raw)",
> +		.cpu_features		= CPU_FTRS_POWER10,
> +		.cpu_user_features	= COMMON_USER_POWER10,
> +		.cpu_user_features2	= COMMON_USER2_POWER10,
> +		.mmu_features		= MMU_FTRS_POWER10,
> +		.icache_bsize		= 128,
> +		.dcache_bsize		= 128,
> +		.num_pmcs		= 6,
> +		.pmc_type		= PPC_PMC_IBM,
> +		.oprofile_cpu_type	= "ppc64/power10",
> +		.oprofile_type		= PPC_OPROFILE_INVALID,
> +		.cpu_setup		= __setup_cpu_power10,
> +		.cpu_restore		= __restore_cpu_power10,
> +		.machine_check_early	= __machine_check_early_realmode_p10,
> +		.platform		= "power10",
> +	},
>   	{	/* Cell Broadband Engine */
>   		.pvr_mask		= 0xffff0000,
>   		.pvr_value		= 0x00700000,
>