cpupowerutils - cpufrequtils extended with quite some features

CPU power consumption vs performance tuning is no longer
limited to CPU frequency switching anymore: deep sleep states,
traditional dynamic frequency scaling and hidden turbo/boost
frequencies are tied close together and depend on each other.
The first two exist on different architectures like PPC, Itanium and
ARM, the latter (so far) only on X86. On X86 the APU (CPU+GPU) will
only run most efficiently if CPU and GPU has proper power management
in place.

Users and Developers want to have *one* tool to get an overview what
their system supports and to monitor and debug CPU power management
in detail. The tool should compile and work on as many architectures
as possible.

Once this tool stabilizes a bit, it is intended to replace the
Intel-specific tools in tools/power/x86

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 78 insertions, 0 deletions

diff --git a/tools/power/cpupower/debug/i386/intel_gsic.c b/tools/power/cpupower/debug/i386/intel_gsic.c
new file mode 100644
index 000000000000..53f5293c9c9a
--- /dev/null
+++ b/tools/power/cpupower/debug/i386/intel_gsic.c
@@ -0,0 +1,78 @@
+/*
+ *  (C) 2003  Bruno Ducrot
+ *  (C) 2004  Dominik Brodowski <linux@dominikbrodowski.de>
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ *
+ * Based on code found in
+ * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
+ * and originally developed by Andy Grover <andrew.grover@intel.com>
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <lrmi.h>
+
+int main (void)
+{
+	struct LRMI_regs	r;
+	int			retval;
+
+	if (!LRMI_init())
+		return 0;
+
+	memset(&r, 0, sizeof(r));
+
+	r.eax = 0x0000E980;
+	r.edx = 0x47534943;
+
+	retval = LRMI_int(0x15, &r);
+
+	if (!retval) {
+		printf("Failed!\n");
+		return 0;
+	}
+	if (r.eax == 0x47534943) {
+		printf("BIOS supports GSIC call:\n");
+		printf("\tsignature: %c%c%c%c\n",
+		       (r.eax >> 24) & 0xff,
+		       (r.eax >> 16) & 0xff,
+		       (r.eax >> 8) & 0xff,
+		       (r.eax) & 0xff);
+		printf("\tcommand port = 0x%.4x\n",
+		       r.ebx & 0xffff);
+		printf("\tcommand =      0x%.4x\n",
+		       (r.ebx >> 16) & 0xffff);
+		printf("\tevent port =   0x%.8x\n", r.ecx);
+		printf("\tflags =        0x%.8x\n", r.edx);
+		if (((r.ebx >> 16) & 0xffff) != 0x82) {
+			printf("non-default command value. If speedstep-smi "
+			       "doesn't work out of the box,\nyou may want to "
+			       "try out the default value by passing "
+			       "smi_cmd=0x82 to the module\n ON YOUR OWN "
+			       "RISK.\n");
+		}
+		if ((r.ebx & 0xffff) != 0xb2) {
+			printf("non-default command port. If speedstep-smi "
+			       "doesn't work out of the box,\nyou may want to "
+			       "try out the default value by passing "
+			       "smi_port=0x82 to the module\n ON YOUR OWN "
+			       "RISK.\n");
+		}
+	} else {
+		printf("BIOS DOES NOT support GSIC call.  Dumping registers anyway:\n");
+		printf("eax = 0x%.8x\n", r.eax);
+		printf("ebx = 0x%.8x\n", r.ebx);
+		printf("ecx = 0x%.8x\n", r.ecx);
+		printf("edx = 0x%.8x\n", r.edx);
+		printf("Note also that some BIOS do not support the initial "
+		       "GSIC call, but the newer\nspeeedstep-smi driver may "
+		       "work.\nFor this, you need to pass some arguments to "
+		       "the speedstep-smi driver:\n");
+		printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
+		printf("\nUnfortunately, you have to know what exactly are "
+		       "smi_cmd and smi_port, and this\nis system "
+		       "dependant.\n");
+	}
+	return 1;
+}