For hv_24x7 socket/chip level events, specific chip-id to which the data requested should be added as part of pmu events. But number of chips/socket in the system details are not exposed.
Patch implements read_sys_info_pseries() to get system parameter values like number of sockets and chips per socket. Rtas_call with token "PROCESSOR_MODULE_INFO" is used to get these values. Sub-sequent patch exports these values via sysfs. Patch also make these parameters default to 1. Signed-off-by: Kajol Jain <kj...@linux.ibm.com> --- arch/powerpc/include/asm/rtas.h | 1 + arch/powerpc/perf/hv-24x7.c | 72 +++++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+) diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index 3c1887351c71..1c11f814932d 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -482,6 +482,7 @@ static inline void rtas_initialize(void) { }; #endif extern int call_rtas(const char *, int, int, unsigned long *, ...); +extern void read_sys_info_pseries(void); #endif /* __KERNEL__ */ #endif /* _POWERPC_RTAS_H */ diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c index 48e8f4b17b91..8cf242aad98f 100644 --- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -20,6 +20,7 @@ #include <asm/io.h> #include <linux/byteorder/generic.h> +#include <asm/rtas.h> #include "hv-24x7.h" #include "hv-24x7-catalog.h" #include "hv-common.h" @@ -57,6 +58,75 @@ static bool is_physical_domain(unsigned domain) } } +/* + * The Processor Module Information system parameter allows transferring + * of certain processor module information from the platform to the OS. + * Refer PAPR+ document to get parameter token value as '43'. + */ + +#define PROCESSOR_MODULE_INFO 43 +#define PROCESSOR_MAX_LENGTH (8 * 1024) + +DEFINE_SPINLOCK(rtas_local_data_buf_lock); +EXPORT_SYMBOL(rtas_local_data_buf_lock); + +static u32 phys_sockets; /* Physical sockets */ +static u32 phys_chipspersocket; /* Physical chips per socket*/ +static u32 phys_coresperchip; /* Physical cores per chip */ + +/* + * Function read_sys_info_pseries() make a rtas_call which require + * data buffer of size 8K. As standard 'rtas_data_buf' is of size + * 4K, we are adding new local buffer 'rtas_local_data_buf'. + */ +static __be16 rtas_local_data_buf[PROCESSOR_MAX_LENGTH] __cacheline_aligned; + +/* + * read_sys_info_pseries() + * Retrieve the number of sockets and chips per socket and cores per + * chip details through the get-system-parameter rtas call. + */ +void read_sys_info_pseries(void) +{ + int call_status, len, ntypes; + + /* + * Making system parameter: chips and sockets and cores per chip + * default to 1. + */ + phys_sockets = 1; + phys_chipspersocket = 1; + phys_coresperchip = 1; + memset(rtas_local_data_buf, 0, PROCESSOR_MAX_LENGTH * sizeof(__be16)); + spin_lock(&rtas_local_data_buf_lock); + + call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, + NULL, + PROCESSOR_MODULE_INFO, + __pa(rtas_local_data_buf), + PROCESSOR_MAX_LENGTH); + + spin_unlock(&rtas_local_data_buf_lock); + + if (call_status != 0) { + pr_info("Error calling get-system-parameter (0x%x)\n", + call_status); + } else { + rtas_local_data_buf[PROCESSOR_MAX_LENGTH - 1] = '\0'; + len = be16_to_cpup((__be16 *)&rtas_local_data_buf[0]); + if (len < 4) + return; + + ntypes = be16_to_cpup(&rtas_local_data_buf[1]); + + if (!ntypes) + return; + phys_sockets = be16_to_cpup(&rtas_local_data_buf[2]); + phys_chipspersocket = be16_to_cpup(&rtas_local_data_buf[3]); + phys_coresperchip = be16_to_cpup(&rtas_local_data_buf[4]); + } +} + /* Domains for which more than one result element are returned for each event. */ static bool domain_needs_aggregation(unsigned int domain) { @@ -1605,6 +1675,8 @@ static int hv_24x7_init(void) if (r) return r; + read_sys_info_pseries(); + return 0; } -- 2.18.2