On Mon, 9 Aug 2021 10:48:51 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:
> The maximum CPU Topology nested level is available with the SCLP
> READ_INFO command inside the byte at offset 15 of the ReadInfo
> structure.
>
> Let's return this information to check the number of topology nested
> information available with the STSI 15.1.x instruction.
>
> Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
> ---
> lib/s390x/sclp.c | 6 ++++++
> lib/s390x/sclp.h | 4 +++-
> 2 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
> index 9502d161..ee379ddf 100644
> --- a/lib/s390x/sclp.c
> +++ b/lib/s390x/sclp.c
> @@ -123,6 +123,12 @@ int sclp_get_cpu_num(void)
> return read_info->entries_cpu;
> }
>
> +int sclp_get_stsi_parm(void)
> +{
> + assert(read_info);
> + return read_info->stsi_parm;
> +}
> +
> CPUEntry *sclp_get_cpu_entries(void)
> {
> assert(read_info);
> diff --git a/lib/s390x/sclp.h b/lib/s390x/sclp.h
> index 28e526e2..1a365958 100644
> --- a/lib/s390x/sclp.h
> +++ b/lib/s390x/sclp.h
> @@ -146,7 +146,8 @@ typedef struct ReadInfo {
> SCCBHeader h;
> uint16_t rnmax;
> uint8_t rnsize;
> - uint8_t _reserved1[16 - 11]; /* 11-15 */
> + uint8_t _reserved1[15 - 11]; /* 11-14 */
> + uint8_t stsi_parm;
> uint16_t entries_cpu; /* 16-17 */
> uint16_t offset_cpu; /* 18-19 */
> uint8_t _reserved2[24 - 20]; /* 20-23 */
> @@ -322,6 +323,7 @@ void sclp_console_setup(void);
> void sclp_print(const char *str);
> void sclp_read_info(void);
> int sclp_get_cpu_num(void);
> +int sclp_get_stsi_parm(void);
> CPUEntry *sclp_get_cpu_entries(void);
> void sclp_facilities_setup(void);
> int sclp_service_call(unsigned int command, void *sccb);
