On Wed, 2014-10-01 at 13:16 +0530, Shreyas B. Prabhu wrote:
> PORE can be programmed to restore hypervisor registers when waking up
> from deep cpu idle states like winkle.
Tell us a bit more about what "PORE" is. IE, explain a tiny engine will
reconfigure the core and its ucode can be patched to provide some
registers with sane values.
> Add call to pass SPR address and value to OPAL, which in turn will
> program PORE to restore the register state.
Otherwise, Acke-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> Cc: Paul Mackerras <pau...@samba.org>
> Cc: Michael Ellerman <m...@ellerman.id.au>
> Suggested-by: Vaidyanathan Srinivasan <sva...@linux.vnet.ibm.com>
> Signed-off-by: Shreyas B. Prabhu <shre...@linux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/opal.h | 2 ++
> arch/powerpc/platforms/powernv/opal-wrappers.S | 1 +
> 2 files changed, 3 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
> index 166d572..d376020 100644
> --- a/arch/powerpc/include/asm/opal.h
> +++ b/arch/powerpc/include/asm/opal.h
> @@ -150,6 +150,7 @@ struct opal_sg_list {
> #define OPAL_PCI_EEH_FREEZE_SET 97
> #define OPAL_HANDLE_HMI 98
> #define OPAL_CONFIG_IDLE_STATE 99
> +#define OPAL_SLW_SET_REG 100
> #define OPAL_REGISTER_DUMP_REGION 101
> #define OPAL_UNREGISTER_DUMP_REGION 102
>
> @@ -978,6 +979,7 @@ extern int opal_handle_hmi_exception(struct pt_regs
> *regs);
> extern void opal_shutdown(void);
> extern int opal_resync_timebase(void);
> int64_t opal_config_idle_state(uint64_t state, uint64_t enter);
> +int64_t opal_slw_set_reg(uint64_t cpu_pir, uint64_t sprn, uint64_t val);
>
> extern void opal_lpc_init(void);
>
> diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S
> b/arch/powerpc/platforms/powernv/opal-wrappers.S
> index 8d1e724..12e5d46 100644
> --- a/arch/powerpc/platforms/powernv/opal-wrappers.S
> +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
> @@ -246,5 +246,6 @@ OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
> OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
> OPAL_CALL(opal_handle_hmi, OPAL_HANDLE_HMI);
> OPAL_CALL(opal_config_idle_state, OPAL_CONFIG_IDLE_STATE);
> +OPAL_CALL(opal_slw_set_reg, OPAL_SLW_SET_REG);
> OPAL_CALL(opal_register_dump_region, OPAL_REGISTER_DUMP_REGION);
> OPAL_CALL(opal_unregister_dump_region,
> OPAL_UNREGISTER_DUMP_REGION);
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