1 // SPDX-License-Identifier: GPL-2.0 2 #include <sys/types.h> 3 #include <errno.h> 4 #include <unistd.h> 5 #include <stdio.h> 6 #include <stdlib.h> 7 #include <string.h> 8 #include <linux/stringify.h> 9 #include "header.h" 10 #include "metricgroup.h" 11 #include <api/fs/fs.h> 12 13 #define mfspr(rn) ({unsigned long rval; \ 14 asm volatile("mfspr %0," __stringify(rn) \ 15 : "=r" (rval)); rval; }) 16 17 #define SPRN_PVR 0x11F /* Processor Version Register */ 18 #define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */ 19 #define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */ 20 21 int 22 get_cpuid(char *buffer, size_t sz) 23 { 24 unsigned long pvr; 25 int nb; 26 27 pvr = mfspr(SPRN_PVR); 28 29 nb = scnprintf(buffer, sz, "%lu,%lu$", PVR_VER(pvr), PVR_REV(pvr)); 30 31 /* look for end marker to ensure the entire data fit */ 32 if (strchr(buffer, '$')) { 33 buffer[nb-1] = '\0'; 34 return 0; 35 } 36 return ENOBUFS; 37 } 38 39 char * 40 get_cpuid_str(struct perf_pmu *pmu __maybe_unused) 41 { 42 char *bufp; 43 44 if (asprintf(&bufp, "%.8lx", mfspr(SPRN_PVR)) < 0) 45 bufp = NULL; 46 47 return bufp; 48 } 49 50 int arch_get_runtimeparam(void) 51 { 52 int count; 53 return sysfs__read_int("/devices/hv_24x7/interface/sockets", &count) < 0 ? 1 : count; 54 } 55