From: Kyle Hale, Shiva Rao, and Peter Dinda <kh@u.northwestern.edu>
Date: Wed, 13 Aug 2014 00:05:25 +0000 (-0500)
Subject: P-State control on Linux - User Utility and Library
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=624392c7b8a4c9a00939315e62add5f30d3d807c

P-State control on Linux - User Utility and Library
---

diff --git a/linux_usr/Makefile b/linux_usr/Makefile
index f1aaaca..e57a444 100644
--- a/linux_usr/Makefile
+++ b/linux_usr/Makefile
@@ -33,7 +33,8 @@ BASE_EXECS = 	v3_mem \
 		v3_receive \
 		v3_pci \
 		v3_guest_mem_access \
-		v3_guest_mem_track
+		v3_guest_mem_track \
+                v3_dvfs
 
 
 #
@@ -67,7 +68,7 @@ COPIED_EXECS = v3_x0vncserver v3_x0gui
 #
 # Libraries that we need to build
 #
-LIBS = libv3_user_host_dev.a libv3_user_keyed_stream.a libv3_ctrl.a libv3_guest_mem.a libv3_fb.a
+LIBS = libv3_user_host_dev.a libv3_user_keyed_stream.a libv3_ctrl.a libv3_guest_mem.a libv3_fb.a libv3_user_dvfs.a
 
 BUILD_EXECS = $(BASE_EXECS) $(EXAMPLE_EXECS) $(EXPERIMENTAL_EXECS) 
 BUILD_LIBS = $(LIBS)
@@ -180,6 +181,17 @@ v3_guest_mem_access : v3_guest_mem_access.c libv3_guest_mem.a libv3_ctrl.a
 v3_guest_mem_track : v3_guest_mem_track.c libv3_guest_mem.a libv3_ctrl.a
 	$(CC) $(CFLAGS) $< -L. -lv3_guest_mem -lv3_ctrl -o $@
 
+#
+# User DVFS control includse a library and a caller
+#
+libv3_user_dvfs.a : v3_user_dvfs.c v3_user_dvfs.h v3_ctrl.h
+	$(CC) $(CFLAGS) -I../linux_module -c v3_user_dvfs.c 
+	$(AR) ruv libv3_user_dvfs.a v3_user_dvfs.o
+	rm -f v3_user_dvfs.o
+
+v3_dvfs : v3_dvfs.c libv3_user_dvfs.a libv3_ctrl.a
+	$(CC) $(CFLAGS) $< -I../linux_module -L. -lv3_user_dvfs -lv3_ctrl -o $@
+
 
 #
 # FB (Graphics Console) user interface library (needed for VNC access
diff --git a/linux_usr/v3_ctrl.h b/linux_usr/v3_ctrl.h
index 20eadc4..8b448bc 100644
--- a/linux_usr/v3_ctrl.h
+++ b/linux_usr/v3_ctrl.h
@@ -21,6 +21,8 @@
 #define V3_ADD_PCI_HW_DEV 55
 #define V3_ADD_PCI_USER_DEV 56
 
+#define V3_DVFS_CTRL  60
+
 /* VM Specific IOCTLs */
 
 /* VM Specific ioctls */
diff --git a/linux_usr/v3_dvfs.c b/linux_usr/v3_dvfs.c
new file mode 100644
index 0000000..edd655f
--- /dev/null
+++ b/linux_usr/v3_dvfs.c
@@ -0,0 +1,101 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "v3_user_dvfs.h"
+
+void usage() 
+{
+    fprintf(stderr,"usage: v3_dvfs core|core..core command\n");
+    fprintf(stderr,"    where command is one of the following\n");
+    fprintf(stderr,"           acquire direct|external\n");
+    fprintf(stderr,"           pstate  number\n");
+    fprintf(stderr,"           freq    number (kHz)\n");
+    fprintf(stderr,"           release\n\n"); 
+    fprintf(stderr,"Look at /proc/v3vee/v3-dvfs to see state\n\n");
+}
+
+  
+
+int main(int argc, char *argv[])
+{
+  if (argc!=4 && argc!=3) { 
+    usage();
+    return -1;
+  }
+
+
+  uint32_t corestart, coreend, core ;
+  int rc;
+  char *cmd=argv[2];
+
+  if (strstr(argv[1],"..")) { 
+      if (sscanf(argv[1],"%u..%u",&corestart,&coreend)!=2) {
+	  usage();
+	  return -1;
+      }
+  } else {
+      corestart=coreend=atoi(argv[1]);
+  }
+
+
+  if (argc==3 && strcasecmp(cmd,"release")) { 
+      usage();
+      return -1;
+  }
+
+  char *arg=argv[3];
+
+  rc=0;
+
+  for (core=corestart;core<=coreend;core++) {
+      if (!strcasecmp(cmd,"acquire")) { 
+	  if (!strcasecmp(arg,"direct")) { 
+	      if (v3_user_dvfs_acquire_direct(core)) { 
+		  fprintf(stderr,"Failed to set core %u to direct\n",core);
+		  rc=-1;
+	      } else {
+		  fprintf(stderr,"Core %u set to direct\n",core);
+	      }
+	  } else if (!strcasecmp(arg,"external")) {
+	      if (v3_user_dvfs_acquire_external(core)) { 
+		  fprintf(stderr,"Failed to set core %u to external\n",core);
+		  rc=-1;
+	      } else {
+		  fprintf(stderr,"Core %u set to external\n",core);
+	      }
+	  } else {
+	      usage();
+	      return -1;
+	  }
+      } else if (!strcasecmp(cmd,"pstate")) { 
+	  if (v3_user_dvfs_set_pstate(core,atoi(arg))) { 
+	      fprintf(stderr,"Failed to set core %u to pstate %d\n",core,atoi(arg));
+	      rc=-1;
+	  } else {
+	      fprintf(stderr,"Core %u set to pstate %d\n",core,atoi(arg));
+	  }
+      } else if (!strcasecmp(cmd,"freq")) { 
+	  if (v3_user_dvfs_set_freq(core,atoll(arg))) { 
+	      fprintf(stderr,"Failed to set core %u to frequency %lld kHz\n",core,atoll(arg));
+	      rc=-1;
+	  } else {
+	      fprintf(stderr,"Core %u set to frequency %lld kHz\n",core,atoll(arg));
+	  }
+      } else if (!strcasecmp(cmd,"release")) { 
+	  if (v3_user_dvfs_release(core)) { 
+	      fprintf(stderr,"Failed to release core %u to host control\n",core);
+	      rc=-1;
+	  } else {
+	      fprintf(stderr,"Released core %u to host control\n",core);
+	  }
+      } else {
+	  usage();
+	  return -1;
+      }
+  }
+
+  return rc;
+
+}
+