From 66aca8aa35bc0b07c754d9ad95c808e4d91f58f1 Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Sat, 24 Aug 2024 16:07:11 +0200
Subject: Add multi-CPU support

---
 cpulist.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 cpulist.c

(limited to 'cpulist.c')

diff --git a/cpulist.c b/cpulist.c
new file mode 100644
index 0000000..307638d
--- /dev/null
+++ b/cpulist.c
@@ -0,0 +1,110 @@
+#include <fcntl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include "debug.h"
+#include "sysfs.h"
+#include "cputemp2maxfreq.h"
+
+extern struct s_config config;
+extern struct s_cpudata cpudata;
+
+// Add a CPU to the list
+void cpulist_add(char *cpu)
+{
+ cpudata.cpulist_len++;
+ cpudata.cpulist=reallocarray(cpudata.cpulist,cpudata.cpulist_len,sizeof(char *));
+ cpudata.cpulist[cpudata.cpulist_len-1]=malloc(strlen(cpu)+1);
+ strcpy(cpudata.cpulist[cpudata.cpulist_len-1],cpu);
+ cpudata.cpulist[cpudata.cpulist_len-1][strlen(cpu)]=0;
+}
+
+// Validate if we found a file named cpu[0-9][0-9][0-9]
+int cpulist_is_cpu(char *name)
+{
+ if (strncmp(name,"cpu",3)!=0) return 0;
+ if ((name[3]<'0') || (name[3]>'9')) return 0;
+ if (name[4]==0) return 1;
+
+ if ((name[4]<'0') || (name[4]>'9')) return 0;
+ if (name[5]==0) return 1;
+
+ if ((name[5]<'0') || (name[5]>'9')) return 0;
+ if (name[6]==0) return 1;
+
+ return 0;
+}
+
+// Set a cpufreq parameter to a value
+int cpulist_find_cpus()
+{
+ DIR *cpudir;
+ struct dirent *cpu_dirent;
+ char sysfs_file[128];
+ int package;
+
+ DEBUG1_CPULIST("Started\n")
+
+ if (cpudata.cpulist!=NULL)
+ {
+  DEBUG1_CPULIST("cpulist already set, free list first\n");
+  return -1;
+ } 
+ cpudata.cpulist_len=0;
+
+// Open the CPU directory in sysfs
+ cpudir=opendir("/sys/devices/system/cpu");
+ if (cpudir==NULL)
+ {
+  DEBUG1_CPULIST("Unable to find CPU's\n");
+  return -1;
+ }
+
+ cpu_dirent=readdir(cpudir);
+ while(cpu_dirent!=NULL)
+ {
+
+// Check if it's a CPU and it belongs to the correct physical package
+  if (cpulist_is_cpu(cpu_dirent->d_name))
+  {
+   DEBUG2_CPULIST("Found CPU %s\n",cpu_dirent->d_name);
+   snprintf(sysfs_file,128,"/sys/devices/system/cpu/%s/topology/physical_package_id",cpu_dirent->d_name);
+   package=sysfs_read_long_int(sysfs_file);
+   DEBUG2_CPULIST("CPU Belongs to package id %d\n",package);
+   if ((package==config.cpu) || (config.cpu<0))
+   {
+    DEBUG2_CPULIST("Add to list\n");
+    cpulist_add(cpu_dirent->d_name);
+   } else {
+    DEBUG2_CPULIST("Skip this CPU\n");
+   }
+  }
+
+  cpu_dirent=readdir(cpudir);
+ }
+ closedir(cpudir);
+
+ DEBUG1_CPULIST("Found %d CPU's\n",config.cpulist_len);
+ if (cpudata.cpulist_len==0)
+ {
+   config.logger("Warning: Found no CPU's beloning to physical CPU %d",config.cpu);
+ }
+
+ return 0;
+}
+
+void cpulist_free()
+{
+ int count;
+ if (cpudata.cpulist==NULL) return;
+
+ for(count=0;count<cpudata.cpulist_len;count++) free(cpudata.cpulist[count]);
+
+ free(cpudata.cpulist);
+ cpudata.cpulist=NULL;
+ cpudata.cpulist_len=0;
+}
-- 
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