Initial commit; kernel source import

tools/power/cpupower/utils/helpers/amd.c

@@ -0,0 +1,135 @@
+#if defined(__i386__) || defined(__x86_64__)
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include <pci/pci.h>
+
+#include "helpers/helpers.h"
+
+#define MSR_AMD_PSTATE_STATUS	0xc0010063
+#define MSR_AMD_PSTATE		0xc0010064
+#define MSR_AMD_PSTATE_LIMIT	0xc0010061
+
+union msr_pstate {
+	struct {
+		unsigned fid:6;
+		unsigned did:3;
+		unsigned vid:7;
+		unsigned res1:6;
+		unsigned nbdid:1;
+		unsigned res2:2;
+		unsigned nbvid:7;
+		unsigned iddval:8;
+		unsigned idddiv:2;
+		unsigned res3:21;
+		unsigned en:1;
+	} bits;
+	unsigned long long val;
+};
+
+static int get_did(int family, union msr_pstate pstate)
+{
+	int t;
+
+	if (family == 0x12)
+		t = pstate.val & 0xf;
+	else
+		t = pstate.bits.did;
+
+	return t;
+}
+
+static int get_cof(int family, union msr_pstate pstate)
+{
+	int t;
+	int fid, did;
+
+	did = get_did(family, pstate);
+
+	t = 0x10;
+	fid = pstate.bits.fid;
+	if (family == 0x11)
+		t = 0x8;
+
+	return (100 * (fid + t)) >> did;
+}
+
+/* Needs:
+ * cpu          -> the cpu that gets evaluated
+ * cpu_family   -> The cpu's family (0x10, 0x12,...)
+ * boots_states -> how much boost states the machines support
+ *
+ * Fills up:
+ * pstates -> a pointer to an array of size MAX_HW_PSTATES
+ *            must be initialized with zeros.
+ *            All available  HW pstates (including boost states)
+ * no      -> amount of pstates above array got filled up with
+ *
+ * returns zero on success, -1 on failure
+ */
+int decode_pstates(unsigned int cpu, unsigned int cpu_family,
+		   int boost_states, unsigned long *pstates, int *no)
+{
+	int i, psmax, pscur;
+	union msr_pstate pstate;
+	unsigned long long val;
+
+	/* Only read out frequencies from HW when CPU might be boostable
+	   to keep the code as short and clean as possible.
+	   Otherwise frequencies are exported via ACPI tables.
+	*/
+	if (cpu_family < 0x10 || cpu_family == 0x14)
+		return -1;
+
+	if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
+		return -1;
+
+	psmax = (val >> 4) & 0x7;
+
+	if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val))
+		return -1;
+
+	pscur = val & 0x7;
+
+	pscur += boost_states;
+	psmax += boost_states;
+	for (i = 0; i <= psmax; i++) {
+		if (i >= MAX_HW_PSTATES) {
+			fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
+				psmax, MAX_HW_PSTATES);
+			return -1;
+		}
+		if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
+			return -1;
+		pstates[i] = get_cof(cpu_family, pstate);
+	}
+	*no = i;
+	return 0;
+}
+
+int amd_pci_get_num_boost_states(int *active, int *states)
+{
+	struct pci_access *pci_acc;
+	struct pci_dev *device;
+	uint8_t val = 0;
+
+	*active = *states = 0;
+
+	device = pci_slot_func_init(&pci_acc, 0x18, 4);
+
+	if (device == NULL)
+		return -ENODEV;
+
+	val = pci_read_byte(device, 0x15c);
+	if (val & 3)
+		*active = 1;
+	else
+		*active = 0;
+	*states = (val >> 2) & 7;
+
+	pci_cleanup(pci_acc);
+	return 0;
+}
+#endif /* defined(__i386__) || defined(__x86_64__) */

tools/power/cpupower/utils/helpers/bitmask.c

@@ -0,0 +1,292 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <helpers/bitmask.h>
+
+/* How many bits in an unsigned long */
+#define bitsperlong (8 * sizeof(unsigned long))
+
+/* howmany(a,b) : how many elements of size b needed to hold all of a */
+#define howmany(x, y) (((x)+((y)-1))/(y))
+
+/* How many longs in mask of n bits */
+#define longsperbits(n) howmany(n, bitsperlong)
+
+#define max(a, b) ((a) > (b) ? (a) : (b))
+
+/*
+ * Allocate and free `struct bitmask *`
+ */
+
+/* Allocate a new `struct bitmask` with a size of n bits */
+struct bitmask *bitmask_alloc(unsigned int n)
+{
+	struct bitmask *bmp;
+
+	bmp = malloc(sizeof(*bmp));
+	if (bmp == 0)
+		return 0;
+	bmp->size = n;
+	bmp->maskp = calloc(longsperbits(n), sizeof(unsigned long));
+	if (bmp->maskp == 0) {
+		free(bmp);
+		return 0;
+	}
+	return bmp;
+}
+
+/* Free `struct bitmask` */
+void bitmask_free(struct bitmask *bmp)
+{
+	if (bmp == 0)
+		return;
+	free(bmp->maskp);
+	bmp->maskp = (unsigned long *)0xdeadcdef;  /* double free tripwire */
+	free(bmp);
+}
+
+/*
+ * The routines _getbit() and _setbit() are the only
+ * routines that actually understand the layout of bmp->maskp[].
+ *
+ * On little endian architectures, this could simply be an array of
+ * bytes.  But the kernel layout of bitmasks _is_ visible to userspace
+ * via the sched_(set/get)affinity calls in Linux 2.6, and on big
+ * endian architectures, it is painfully obvious that this is an
+ * array of unsigned longs.
+ */
+
+/* Return the value (0 or 1) of bit n in bitmask bmp */
+static unsigned int _getbit(const struct bitmask *bmp, unsigned int n)
+{
+	if (n < bmp->size)
+		return (bmp->maskp[n/bitsperlong] >> (n % bitsperlong)) & 1;
+	else
+		return 0;
+}
+
+/* Set bit n in bitmask bmp to value v (0 or 1) */
+static void _setbit(struct bitmask *bmp, unsigned int n, unsigned int v)
+{
+	if (n < bmp->size) {
+		if (v)
+			bmp->maskp[n/bitsperlong] |= 1UL << (n % bitsperlong);
+		else
+			bmp->maskp[n/bitsperlong] &=
+				~(1UL << (n % bitsperlong));
+	}
+}
+
+/*
+ * When parsing bitmask lists, only allow numbers, separated by one
+ * of the allowed next characters.
+ *
+ * The parameter 'sret' is the return from a sscanf "%u%c".  It is
+ * -1 if the sscanf input string was empty.  It is 0 if the first
+ * character in the sscanf input string was not a decimal number.
+ * It is 1 if the unsigned number matching the "%u" was the end of the
+ * input string.  It is 2 if one or more additional characters followed
+ * the matched unsigned number.  If it is 2, then 'nextc' is the first
+ * character following the number.  The parameter 'ok_next_chars'
+ * is the nul-terminated list of allowed next characters.
+ *
+ * The mask term just scanned was ok if and only if either the numbers
+ * matching the %u were all of the input or if the next character in
+ * the input past the numbers was one of the allowed next characters.
+ */
+static int scan_was_ok(int sret, char nextc, const char *ok_next_chars)
+{
+	return sret == 1 ||
+		(sret == 2 && strchr(ok_next_chars, nextc) != NULL);
+}
+
+static const char *nexttoken(const char *q,  int sep)
+{
+	if (q)
+		q = strchr(q, sep);
+	if (q)
+		q++;
+	return q;
+}
+
+/* Set a single bit i in bitmask */
+struct bitmask *bitmask_setbit(struct bitmask *bmp, unsigned int i)
+{
+	_setbit(bmp, i, 1);
+	return bmp;
+}
+
+/* Set all bits in bitmask: bmp = ~0 */
+struct bitmask *bitmask_setall(struct bitmask *bmp)
+{
+	unsigned int i;
+	for (i = 0; i < bmp->size; i++)
+		_setbit(bmp, i, 1);
+	return bmp;
+}
+
+/* Clear all bits in bitmask: bmp = 0 */
+struct bitmask *bitmask_clearall(struct bitmask *bmp)
+{
+	unsigned int i;
+	for (i = 0; i < bmp->size; i++)
+		_setbit(bmp, i, 0);
+	return bmp;
+}
+
+/* True if all bits are clear */
+int bitmask_isallclear(const struct bitmask *bmp)
+{
+	unsigned int i;
+	for (i = 0; i < bmp->size; i++)
+		if (_getbit(bmp, i))
+			return 0;
+	return 1;
+}
+
+/* True if specified bit i is set */
+int bitmask_isbitset(const struct bitmask *bmp, unsigned int i)
+{
+	return _getbit(bmp, i);
+}
+
+/* Number of lowest set bit (min) */
+unsigned int bitmask_first(const struct bitmask *bmp)
+{
+	return bitmask_next(bmp, 0);
+}
+
+/* Number of highest set bit (max) */
+unsigned int bitmask_last(const struct bitmask *bmp)
+{
+	unsigned int i;
+	unsigned int m = bmp->size;
+	for (i = 0; i < bmp->size; i++)
+		if (_getbit(bmp, i))
+			m = i;
+	return m;
+}
+
+/* Number of next set bit at or above given bit i */
+unsigned int bitmask_next(const struct bitmask *bmp, unsigned int i)
+{
+	unsigned int n;
+	for (n = i; n < bmp->size; n++)
+		if (_getbit(bmp, n))
+			break;
+	return n;
+}
+
+/*
+ * Parses a comma-separated list of numbers and ranges of numbers,
+ * with optional ':%u' strides modifying ranges, into provided bitmask.
+ * Some examples of input lists and their equivalent simple list:
+ *	Input		Equivalent to
+ *	0-3		0,1,2,3
+ *	0-7:2		0,2,4,6
+ *	1,3,5-7		1,3,5,6,7
+ *	0-3:2,8-15:4	0,2,8,12
+ */
+int bitmask_parselist(const char *buf, struct bitmask *bmp)
+{
+	const char *p, *q;
+
+	bitmask_clearall(bmp);
+
+	q = buf;
+	while (p = q, q = nexttoken(q, ','), p) {
+		unsigned int a;		/* begin of range */
+		unsigned int b;		/* end of range */
+		unsigned int s;		/* stride */
+		const char *c1, *c2;	/* next tokens after '-' or ',' */
+		char nextc;		/* char after sscanf %u match */
+		int sret;		/* sscanf return (number of matches) */
+
+		sret = sscanf(p, "%u%c", &a, &nextc);
+		if (!scan_was_ok(sret, nextc, ",-"))
+			goto err;
+		b = a;
+		s = 1;
+		c1 = nexttoken(p, '-');
+		c2 = nexttoken(p, ',');
+		if (c1 != NULL && (c2 == NULL || c1 < c2)) {
+			sret = sscanf(c1, "%u%c", &b, &nextc);
+			if (!scan_was_ok(sret, nextc, ",:"))
+				goto err;
+			c1 = nexttoken(c1, ':');
+			if (c1 != NULL && (c2 == NULL || c1 < c2)) {
+				sret = sscanf(c1, "%u%c", &s, &nextc);
+				if (!scan_was_ok(sret, nextc, ","))
+					goto err;
+			}
+		}
+		if (!(a <= b))
+			goto err;
+		if (b >= bmp->size)
+			goto err;
+		while (a <= b) {
+			_setbit(bmp, a, 1);
+			a += s;
+		}
+	}
+	return 0;
+err:
+	bitmask_clearall(bmp);
+	return -1;
+}
+
+/*
+ * emit(buf, buflen, rbot, rtop, len)
+ *
+ * Helper routine for bitmask_displaylist().  Write decimal number
+ * or range to buf+len, suppressing output past buf+buflen, with optional
+ * comma-prefix.  Return len of what would be written to buf, if it
+ * all fit.
+ */
+
+static inline int emit(char *buf, int buflen, int rbot, int rtop, int len)
+{
+	if (len > 0)
+		len += snprintf(buf + len, max(buflen - len, 0), ",");
+	if (rbot == rtop)
+		len += snprintf(buf + len, max(buflen - len, 0), "%d", rbot);
+	else
+		len += snprintf(buf + len, max(buflen - len, 0), "%d-%d",
+				rbot, rtop);
+	return len;
+}
+
+/*
+ * Write decimal list representation of bmp to buf.
+ *
+ * Output format is a comma-separated list of decimal numbers and
+ * ranges.  Consecutively set bits are shown as two hyphen-separated
+ * decimal numbers, the smallest and largest bit numbers set in
+ * the range.  Output format is compatible with the format
+ * accepted as input by bitmap_parselist().
+ *
+ * The return value is the number of characters which would be
+ * generated for the given input, excluding the trailing '\0', as
+ * per ISO C99.
+ */
+
+int bitmask_displaylist(char *buf, int buflen, const struct bitmask *bmp)
+{
+	int len = 0;
+	/* current bit is 'cur', most recently seen range is [rbot, rtop] */
+	unsigned int cur, rbot, rtop;
+
+	if (buflen > 0)
+		*buf = 0;
+	rbot = cur = bitmask_first(bmp);
+	while (cur < bmp->size) {
+		rtop = cur;
+		cur = bitmask_next(bmp, cur+1);
+		if (cur >= bmp->size || cur > rtop + 1) {
+			len = emit(buf, buflen, rbot, rtop, len);
+			rbot = cur;
+		}
+	}
+	return len;
+}

tools/power/cpupower/utils/helpers/bitmask.h

@@ -0,0 +1,33 @@
+#ifndef __CPUPOWER_BITMASK__
+#define __CPUPOWER_BITMASK__
+
+/* Taken over from libbitmask, a project initiated from sgi:
+ * Url:            http://oss.sgi.com/projects/cpusets/
+ * Unfortunately it's not very widespread, therefore relevant parts are
+ * pasted here.
+ */
+
+struct bitmask {
+	unsigned int size;
+	unsigned long *maskp;
+};
+
+struct bitmask *bitmask_alloc(unsigned int n);
+void bitmask_free(struct bitmask *bmp);
+
+struct bitmask *bitmask_setbit(struct bitmask *bmp, unsigned int i);
+struct bitmask *bitmask_setall(struct bitmask *bmp);
+struct bitmask *bitmask_clearall(struct bitmask *bmp);
+
+unsigned int bitmask_first(const struct bitmask *bmp);
+unsigned int bitmask_next(const struct bitmask *bmp, unsigned int i);
+unsigned int bitmask_last(const struct bitmask *bmp);
+int bitmask_isallclear(const struct bitmask *bmp);
+int bitmask_isbitset(const struct bitmask *bmp, unsigned int i);
+
+int bitmask_parselist(const char *buf, struct bitmask *bmp);
+int bitmask_displaylist(char *buf, int len, const struct bitmask *bmp);
+
+
+
+#endif /*__CPUPOWER_BITMASK__ */

tools/power/cpupower/utils/helpers/cpuid.c

@@ -0,0 +1,178 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "helpers/helpers.h"
+
+static const char *cpu_vendor_table[X86_VENDOR_MAX] = {
+	"Unknown", "GenuineIntel", "AuthenticAMD",
+};
+
+#if defined(__i386__) || defined(__x86_64__)
+
+/* from gcc */
+#include <cpuid.h>
+
+/*
+ * CPUID functions returning a single datum
+ *
+ * Define unsigned int cpuid_e[abcd]x(unsigned int op)
+ */
+#define cpuid_func(reg)					\
+	unsigned int cpuid_##reg(unsigned int op)	\
+	{						\
+	unsigned int eax, ebx, ecx, edx;		\
+	__cpuid(op, eax, ebx, ecx, edx);		\
+	return reg;					\
+	}
+cpuid_func(eax);
+cpuid_func(ebx);
+cpuid_func(ecx);
+cpuid_func(edx);
+
+#endif /* defined(__i386__) || defined(__x86_64__) */
+
+/* get_cpu_info
+ *
+ * Extract CPU vendor, family, model, stepping info from /proc/cpuinfo
+ *
+ * Returns 0 on success or a negativ error code
+ *
+ * TBD: Should there be a cpuid alternative for this if /proc is not mounted?
+ */
+int get_cpu_info(unsigned int cpu, struct cpupower_cpu_info *cpu_info)
+{
+	FILE *fp;
+	char value[64];
+	unsigned int proc, x;
+	unsigned int unknown = 0xffffff;
+	unsigned int cpuid_level, ext_cpuid_level;
+
+	int ret = -EINVAL;
+
+	cpu_info->vendor		= X86_VENDOR_UNKNOWN;
+	cpu_info->family		= unknown;
+	cpu_info->model			= unknown;
+	cpu_info->stepping		= unknown;
+	cpu_info->caps			= 0;
+
+	fp = fopen("/proc/cpuinfo", "r");
+	if (!fp)
+		return -EIO;
+
+	while (!feof(fp)) {
+		if (!fgets(value, 64, fp))
+			continue;
+		value[63 - 1] = '\0';
+
+		if (!strncmp(value, "processor\t: ", 12))
+			sscanf(value, "processor\t: %u", &proc);
+
+		if (proc != cpu)
+			continue;
+
+		/* Get CPU vendor */
+		if (!strncmp(value, "vendor_id", 9)) {
+			for (x = 1; x < X86_VENDOR_MAX; x++) {
+				if (strstr(value, cpu_vendor_table[x]))
+					cpu_info->vendor = x;
+			}
+		/* Get CPU family, etc. */
+		} else if (!strncmp(value, "cpu family\t: ", 13)) {
+			sscanf(value, "cpu family\t: %u",
+			       &cpu_info->family);
+		} else if (!strncmp(value, "model\t\t: ", 9)) {
+			sscanf(value, "model\t\t: %u",
+			       &cpu_info->model);
+		} else if (!strncmp(value, "stepping\t: ", 10)) {
+			sscanf(value, "stepping\t: %u",
+			       &cpu_info->stepping);
+
+			/* Exit -> all values must have been set */
+			if (cpu_info->vendor == X86_VENDOR_UNKNOWN ||
+			    cpu_info->family == unknown ||
+			    cpu_info->model == unknown ||
+			    cpu_info->stepping == unknown) {
+				ret = -EINVAL;
+				goto out;
+			}
+
+			ret = 0;
+			goto out;
+		}
+	}
+	ret = -ENODEV;
+out:
+	fclose(fp);
+	/* Get some useful CPU capabilities from cpuid */
+	if (cpu_info->vendor != X86_VENDOR_AMD &&
+	    cpu_info->vendor != X86_VENDOR_INTEL)
+		return ret;
+
+	cpuid_level	= cpuid_eax(0);
+	ext_cpuid_level	= cpuid_eax(0x80000000);
+
+	/* Invariant TSC */
+	if (ext_cpuid_level >= 0x80000007 &&
+	    (cpuid_edx(0x80000007) & (1 << 8)))
+		cpu_info->caps |= CPUPOWER_CAP_INV_TSC;
+
+	/* Aperf/Mperf registers support */
+	if (cpuid_level >= 6 && (cpuid_ecx(6) & 0x1))
+		cpu_info->caps |= CPUPOWER_CAP_APERF;
+
+	/* AMD Boost state enable/disable register */
+	if (cpu_info->vendor == X86_VENDOR_AMD) {
+		if (ext_cpuid_level >= 0x80000007 &&
+		    (cpuid_edx(0x80000007) & (1 << 9)))
+			cpu_info->caps |= CPUPOWER_CAP_AMD_CBP;
+	}
+
+	if (cpu_info->vendor == X86_VENDOR_INTEL) {
+		if (cpuid_level >= 6 &&
+		    (cpuid_eax(6) & (1 << 1)))
+			cpu_info->caps |= CPUPOWER_CAP_INTEL_IDA;
+	}
+
+	if (cpu_info->vendor == X86_VENDOR_INTEL) {
+		/* Intel's perf-bias MSR support */
+		if (cpuid_level >= 6 && (cpuid_ecx(6) & (1 << 3)))
+			cpu_info->caps |= CPUPOWER_CAP_PERF_BIAS;
+
+		/* Intel's Turbo Ratio Limit support */
+		if (cpu_info->family == 6) {
+			switch (cpu_info->model) {
+			case 0x1A:	/* Core i7, Xeon 5500 series
+					 * Bloomfield, Gainstown NHM-EP
+					 */
+			case 0x1E:	/* Core i7 and i5 Processor
+					 * Clarksfield, Lynnfield, Jasper Forest
+					 */
+			case 0x1F:	/* Core i7 and i5 Processor - Nehalem */
+			case 0x25:	/* Westmere Client
+					 * Clarkdale, Arrandale
+					 */
+			case 0x2C:	/* Westmere EP - Gulftown */
+				cpu_info->caps |= CPUPOWER_CAP_HAS_TURBO_RATIO;
+			case 0x2A:	/* SNB */
+			case 0x2D:	/* SNB Xeon */
+			case 0x3A:	/* IVB */
+			case 0x3E:	/* IVB Xeon */
+				cpu_info->caps |= CPUPOWER_CAP_HAS_TURBO_RATIO;
+				cpu_info->caps |= CPUPOWER_CAP_IS_SNB;
+				break;
+			case 0x2E:	/* Nehalem-EX Xeon - Beckton */
+			case 0x2F:	/* Westmere-EX Xeon - Eagleton */
+			default:
+				break;
+			}
+		}
+	}
+
+	/*	printf("ID: %u - Extid: 0x%x - Caps: 0x%llx\n",
+		cpuid_level, ext_cpuid_level, cpu_info->caps);
+	*/
+	return ret;
+}

tools/power/cpupower/utils/helpers/helpers.h

@@ -0,0 +1,195 @@
+/*
+ *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ *
+ * Miscellaneous helpers which do not fit or are worth
+ * to put into separate headers
+ */
+
+#ifndef __CPUPOWERUTILS_HELPERS__
+#define __CPUPOWERUTILS_HELPERS__
+
+#include <libintl.h>
+#include <locale.h>
+
+#include "helpers/bitmask.h"
+
+/* Internationalization ****************************/
+#ifdef NLS
+
+#define _(String) gettext(String)
+#ifndef gettext_noop
+#define gettext_noop(String) String
+#endif
+#define N_(String) gettext_noop(String)
+
+#else /* !NLS */
+
+#define _(String) String
+#define N_(String) String
+
+#endif
+/* Internationalization ****************************/
+
+extern int run_as_root;
+extern struct bitmask *cpus_chosen;
+
+/* Global verbose (-d) stuff *********************************/
+/*
+ * define DEBUG via global Makefile variable
+ * Debug output is sent to stderr, do:
+ * cpupower monitor 2>/tmp/debug
+ * to split debug output away from normal output
+*/
+#ifdef DEBUG
+extern int be_verbose;
+
+#define dprint(fmt, ...) {					\
+		if (be_verbose) {				\
+			fprintf(stderr, "%s: " fmt,		\
+				__func__, ##__VA_ARGS__);	\
+		}						\
+	}
+#else
+static inline void dprint(const char *fmt, ...) { }
+#endif
+extern int be_verbose;
+/* Global verbose (-v) stuff *********************************/
+
+/* cpuid and cpuinfo helpers  **************************/
+enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL,
+			  X86_VENDOR_AMD, X86_VENDOR_MAX};
+
+#define CPUPOWER_CAP_INV_TSC		0x00000001
+#define CPUPOWER_CAP_APERF		0x00000002
+#define CPUPOWER_CAP_AMD_CBP		0x00000004
+#define CPUPOWER_CAP_PERF_BIAS		0x00000008
+#define CPUPOWER_CAP_HAS_TURBO_RATIO	0x00000010
+#define CPUPOWER_CAP_IS_SNB		0x00000020
+#define CPUPOWER_CAP_INTEL_IDA		0x00000040
+
+#define MAX_HW_PSTATES 10
+
+struct cpupower_cpu_info {
+	enum cpupower_cpu_vendor vendor;
+	unsigned int family;
+	unsigned int model;
+	unsigned int stepping;
+	/* CPU capabilities read out from cpuid */
+	unsigned long long caps;
+};
+
+/* get_cpu_info
+ *
+ * Extract CPU vendor, family, model, stepping info from /proc/cpuinfo
+ *
+ * Returns 0 on success or a negativ error code
+ * Only used on x86, below global's struct values are zero/unknown on
+ * other archs
+ */
+extern int get_cpu_info(unsigned int cpu, struct cpupower_cpu_info *cpu_info);
+extern struct cpupower_cpu_info cpupower_cpu_info;
+/* cpuid and cpuinfo helpers  **************************/
+
+struct cpuid_core_info {
+	int pkg;
+	int core;
+	int cpu;
+
+	/* flags */
+	unsigned int is_online:1;
+};
+
+/* CPU topology/hierarchy parsing ******************/
+struct cpupower_topology {
+	/* Amount of CPU cores, packages and threads per core in the system */
+	unsigned int cores;
+	unsigned int pkgs;
+	unsigned int threads; /* per core */
+
+	/* Array gets mallocated with cores entries, holding per core info */
+	struct cpuid_core_info *core_info;
+};
+
+extern int get_cpu_topology(struct cpupower_topology *cpu_top);
+extern void cpu_topology_release(struct cpupower_topology cpu_top);
+
+/* CPU topology/hierarchy parsing ******************/
+
+/* X86 ONLY ****************************************/
+#if defined(__i386__) || defined(__x86_64__)
+
+#include <pci/pci.h>
+
+/* Read/Write msr ****************************/
+extern int read_msr(int cpu, unsigned int idx, unsigned long long *val);
+extern int write_msr(int cpu, unsigned int idx, unsigned long long val);
+
+extern int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val);
+extern int msr_intel_get_perf_bias(unsigned int cpu);
+extern unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu);
+
+/* Read/Write msr ****************************/
+
+/* PCI stuff ****************************/
+extern int amd_pci_get_num_boost_states(int *active, int *states);
+extern struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain,
+				    int bus, int slot, int func, int vendor,
+				    int dev);
+extern struct pci_dev *pci_slot_func_init(struct pci_access **pacc,
+					      int slot, int func);
+
+/* PCI stuff ****************************/
+
+/* AMD HW pstate decoding **************************/
+
+extern int decode_pstates(unsigned int cpu, unsigned int cpu_family,
+			  int boost_states, unsigned long *pstates, int *no);
+
+/* AMD HW pstate decoding **************************/
+
+extern int cpufreq_has_boost_support(unsigned int cpu, int *support,
+				     int *active, int * states);
+/*
+ * CPUID functions returning a single datum
+ */
+unsigned int cpuid_eax(unsigned int op);
+unsigned int cpuid_ebx(unsigned int op);
+unsigned int cpuid_ecx(unsigned int op);
+unsigned int cpuid_edx(unsigned int op);
+
+/* cpuid and cpuinfo helpers  **************************/
+/* X86 ONLY ********************************************/
+#else
+static inline int decode_pstates(unsigned int cpu, unsigned int cpu_family,
+				 int boost_states, unsigned long *pstates,
+				 int *no)
+{ return -1; };
+
+static inline int read_msr(int cpu, unsigned int idx, unsigned long long *val)
+{ return -1; };
+static inline int write_msr(int cpu, unsigned int idx, unsigned long long val)
+{ return -1; };
+static inline int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val)
+{ return -1; };
+static inline int msr_intel_get_perf_bias(unsigned int cpu)
+{ return -1; };
+static inline unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
+{ return 0; };
+
+/* Read/Write msr ****************************/
+
+static inline int cpufreq_has_boost_support(unsigned int cpu, int *support,
+					    int *active, int * states)
+{ return -1; }
+
+/* cpuid and cpuinfo helpers  **************************/
+
+static inline unsigned int cpuid_eax(unsigned int op) { return 0; };
+static inline unsigned int cpuid_ebx(unsigned int op) { return 0; };
+static inline unsigned int cpuid_ecx(unsigned int op) { return 0; };
+static inline unsigned int cpuid_edx(unsigned int op) { return 0; };
+#endif /* defined(__i386__) || defined(__x86_64__) */
+
+#endif /* __CPUPOWERUTILS_HELPERS__ */

tools/power/cpupower/utils/helpers/misc.c

@@ -0,0 +1,27 @@
+#if defined(__i386__) || defined(__x86_64__)
+
+#include "helpers/helpers.h"
+
+int cpufreq_has_boost_support(unsigned int cpu, int *support, int *active,
+			int *states)
+{
+	struct cpupower_cpu_info cpu_info;
+	int ret;
+
+	*support = *active = *states = 0;
+
+	ret = get_cpu_info(0, &cpu_info);
+	if (ret)
+		return ret;
+
+	if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_CBP) {
+		*support = 1;
+		amd_pci_get_num_boost_states(active, states);
+		if (ret <= 0)
+			return ret;
+		*support = 1;
+	} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
+		*support = *active = 1;
+	return 0;
+}
+#endif /* #if defined(__i386__) || defined(__x86_64__) */

tools/power/cpupower/utils/helpers/msr.c

@@ -0,0 +1,115 @@
+#if defined(__i386__) || defined(__x86_64__)
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#include "helpers/helpers.h"
+
+/* Intel specific MSRs */
+#define MSR_IA32_PERF_STATUS		0x198
+#define MSR_IA32_MISC_ENABLES		0x1a0
+#define MSR_IA32_ENERGY_PERF_BIAS	0x1b0
+#define MSR_NEHALEM_TURBO_RATIO_LIMIT	0x1ad
+
+/*
+ * read_msr
+ *
+ * Will return 0 on success and -1 on failure.
+ * Possible errno values could be:
+ * EFAULT -If the read/write did not fully complete
+ * EIO    -If the CPU does not support MSRs
+ * ENXIO  -If the CPU does not exist
+ */
+
+int read_msr(int cpu, unsigned int idx, unsigned long long *val)
+{
+	int fd;
+	char msr_file_name[64];
+
+	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+	fd = open(msr_file_name, O_RDONLY);
+	if (fd < 0)
+		return -1;
+	if (lseek(fd, idx, SEEK_CUR) == -1)
+		goto err;
+	if (read(fd, val, sizeof *val) != sizeof *val)
+		goto err;
+	close(fd);
+	return 0;
+ err:
+	close(fd);
+	return -1;
+}
+
+/*
+ * write_msr
+ *
+ * Will return 0 on success and -1 on failure.
+ * Possible errno values could be:
+ * EFAULT -If the read/write did not fully complete
+ * EIO    -If the CPU does not support MSRs
+ * ENXIO  -If the CPU does not exist
+ */
+int write_msr(int cpu, unsigned int idx, unsigned long long val)
+{
+	int fd;
+	char msr_file_name[64];
+
+	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+	fd = open(msr_file_name, O_WRONLY);
+	if (fd < 0)
+		return -1;
+	if (lseek(fd, idx, SEEK_CUR) == -1)
+		goto err;
+	if (write(fd, &val, sizeof val) != sizeof val)
+		goto err;
+	close(fd);
+	return 0;
+ err:
+	close(fd);
+	return -1;
+}
+
+int msr_intel_get_perf_bias(unsigned int cpu)
+{
+	unsigned long long val;
+	int ret;
+
+	if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS))
+		return -1;
+
+	ret = read_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, &val);
+	if (ret)
+		return ret;
+	return val;
+}
+
+int msr_intel_set_perf_bias(unsigned int cpu, unsigned int val)
+{
+	int ret;
+
+	if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_PERF_BIAS))
+		return -1;
+
+	ret = write_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS, val);
+	if (ret)
+		return ret;
+	return 0;
+}
+
+unsigned long long msr_intel_get_turbo_ratio(unsigned int cpu)
+{
+	unsigned long long val;
+	int ret;
+
+	if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_HAS_TURBO_RATIO))
+		return -1;
+
+	ret = read_msr(cpu, MSR_NEHALEM_TURBO_RATIO_LIMIT, &val);
+	if (ret)
+		return ret;
+	return val;
+}
+#endif

tools/power/cpupower/utils/helpers/pci.c

@@ -0,0 +1,55 @@
+#if defined(__i386__) || defined(__x86_64__)
+
+#include <helpers/helpers.h>
+
+/*
+ * pci_acc_init
+ *
+ * PCI access helper function depending on libpci
+ *
+ * **pacc : if a valid pci_dev is returned
+ *         *pacc must be passed to pci_acc_cleanup to free it
+ *
+ * domain: domain
+ * bus:    bus
+ * slot:   slot
+ * func:   func
+ * vendor: vendor
+ * device: device
+ * Pass -1 for one of the six above to match any
+ *
+ * Returns :
+ * struct pci_dev which can be used with pci_{read,write}_* functions
+ *                to access the PCI config space of matching pci devices
+ */
+struct pci_dev *pci_acc_init(struct pci_access **pacc, int domain, int bus,
+			     int slot, int func, int vendor, int dev)
+{
+	struct pci_filter filter_nb_link = { domain, bus, slot, func,
+					     vendor, dev };
+	struct pci_dev *device;
+
+	*pacc = pci_alloc();
+	if (*pacc == NULL)
+		return NULL;
+
+	pci_init(*pacc);
+	pci_scan_bus(*pacc);
+
+	for (device = (*pacc)->devices; device; device = device->next) {
+		if (pci_filter_match(&filter_nb_link, device))
+			return device;
+	}
+	pci_cleanup(*pacc);
+	return NULL;
+}
+
+/* Typically one wants to get a specific slot(device)/func of the root domain
+   and bus */
+struct pci_dev *pci_slot_func_init(struct pci_access **pacc, int slot,
+				       int func)
+{
+	return pci_acc_init(pacc, 0, 0, slot, func, -1, -1);
+}
+
+#endif /* defined(__i386__) || defined(__x86_64__) */

tools/power/cpupower/utils/helpers/sysfs.c

@@ -0,0 +1,358 @@
+/*
+ *  (C) 2004-2009  Dominik Brodowski <linux@dominikbrodowski.de>
+ *  (C) 2011       Thomas Renninger <trenn@novell.com> Novell Inc.
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "helpers/sysfs.h"
+
+unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen)
+{
+	int fd;
+	ssize_t numread;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return 0;
+
+	numread = read(fd, buf, buflen - 1);
+	if (numread < 1) {
+		close(fd);
+		return 0;
+	}
+
+	buf[numread] = '\0';
+	close(fd);
+
+	return (unsigned int) numread;
+}
+
+/*
+ * Detect whether a CPU is online
+ *
+ * Returns:
+ *     1 -> if CPU is online
+ *     0 -> if CPU is offline
+ *     negative errno values in error case
+ */
+int sysfs_is_cpu_online(unsigned int cpu)
+{
+	char path[SYSFS_PATH_MAX];
+	int fd;
+	ssize_t numread;
+	unsigned long long value;
+	char linebuf[MAX_LINE_LEN];
+	char *endp;
+	struct stat statbuf;
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u", cpu);
+
+	if (stat(path, &statbuf) != 0)
+		return 0;
+
+	/*
+	 * kernel without CONFIG_HOTPLUG_CPU
+	 * -> cpuX directory exists, but not cpuX/online file
+	 */
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/online", cpu);
+	if (stat(path, &statbuf) != 0)
+		return 1;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return -errno;
+
+	numread = read(fd, linebuf, MAX_LINE_LEN - 1);
+	if (numread < 1) {
+		close(fd);
+		return -EIO;
+	}
+	linebuf[numread] = '\0';
+	close(fd);
+
+	value = strtoull(linebuf, &endp, 0);
+	if (value > 1 || value < 0)
+		return -EINVAL;
+
+	return value;
+}
+
+/* CPUidle idlestate specific /sys/devices/system/cpu/cpuX/cpuidle/ access */
+
+/*
+ * helper function to read file from /sys into given buffer
+ * fname is a relative path under "cpuX/cpuidle/stateX/" dir
+ * cstates starting with 0, C0 is not counted as cstate.
+ * This means if you want C1 info, pass 0 as idlestate param
+ */
+unsigned int sysfs_idlestate_read_file(unsigned int cpu, unsigned int idlestate,
+			     const char *fname, char *buf, size_t buflen)
+{
+	char path[SYSFS_PATH_MAX];
+	int fd;
+	ssize_t numread;
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/cpuidle/state%u/%s",
+		 cpu, idlestate, fname);
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		return 0;
+
+	numread = read(fd, buf, buflen - 1);
+	if (numread < 1) {
+		close(fd);
+		return 0;
+	}
+
+	buf[numread] = '\0';
+	close(fd);
+
+	return (unsigned int) numread;
+}
+
+/* read access to files which contain one numeric value */
+
+enum idlestate_value {
+	IDLESTATE_USAGE,
+	IDLESTATE_POWER,
+	IDLESTATE_LATENCY,
+	IDLESTATE_TIME,
+	MAX_IDLESTATE_VALUE_FILES
+};
+
+static const char *idlestate_value_files[MAX_IDLESTATE_VALUE_FILES] = {
+	[IDLESTATE_USAGE] = "usage",
+	[IDLESTATE_POWER] = "power",
+	[IDLESTATE_LATENCY] = "latency",
+	[IDLESTATE_TIME]  = "time",
+};
+
+static unsigned long long sysfs_idlestate_get_one_value(unsigned int cpu,
+						     unsigned int idlestate,
+						     enum idlestate_value which)
+{
+	unsigned long long value;
+	unsigned int len;
+	char linebuf[MAX_LINE_LEN];
+	char *endp;
+
+	if (which >= MAX_IDLESTATE_VALUE_FILES)
+		return 0;
+
+	len = sysfs_idlestate_read_file(cpu, idlestate,
+					idlestate_value_files[which],
+					linebuf, sizeof(linebuf));
+	if (len == 0)
+		return 0;
+
+	value = strtoull(linebuf, &endp, 0);
+
+	if (endp == linebuf || errno == ERANGE)
+		return 0;
+
+	return value;
+}
+
+/* read access to files which contain one string */
+
+enum idlestate_string {
+	IDLESTATE_DESC,
+	IDLESTATE_NAME,
+	MAX_IDLESTATE_STRING_FILES
+};
+
+static const char *idlestate_string_files[MAX_IDLESTATE_STRING_FILES] = {
+	[IDLESTATE_DESC] = "desc",
+	[IDLESTATE_NAME] = "name",
+};
+
+
+static char *sysfs_idlestate_get_one_string(unsigned int cpu,
+					unsigned int idlestate,
+					enum idlestate_string which)
+{
+	char linebuf[MAX_LINE_LEN];
+	char *result;
+	unsigned int len;
+
+	if (which >= MAX_IDLESTATE_STRING_FILES)
+		return NULL;
+
+	len = sysfs_idlestate_read_file(cpu, idlestate,
+					idlestate_string_files[which],
+					linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	result = strdup(linebuf);
+	if (result == NULL)
+		return NULL;
+
+	if (result[strlen(result) - 1] == '\n')
+		result[strlen(result) - 1] = '\0';
+
+	return result;
+}
+
+unsigned long sysfs_get_idlestate_latency(unsigned int cpu,
+					unsigned int idlestate)
+{
+	return sysfs_idlestate_get_one_value(cpu, idlestate, IDLESTATE_LATENCY);
+}
+
+unsigned long sysfs_get_idlestate_usage(unsigned int cpu,
+					unsigned int idlestate)
+{
+	return sysfs_idlestate_get_one_value(cpu, idlestate, IDLESTATE_USAGE);
+}
+
+unsigned long long sysfs_get_idlestate_time(unsigned int cpu,
+					unsigned int idlestate)
+{
+	return sysfs_idlestate_get_one_value(cpu, idlestate, IDLESTATE_TIME);
+}
+
+char *sysfs_get_idlestate_name(unsigned int cpu, unsigned int idlestate)
+{
+	return sysfs_idlestate_get_one_string(cpu, idlestate, IDLESTATE_NAME);
+}
+
+char *sysfs_get_idlestate_desc(unsigned int cpu, unsigned int idlestate)
+{
+	return sysfs_idlestate_get_one_string(cpu, idlestate, IDLESTATE_DESC);
+}
+
+/*
+ * Returns number of supported C-states of CPU core cpu
+ * Negativ in error case
+ * Zero if cpuidle does not export any C-states
+ */
+int sysfs_get_idlestate_count(unsigned int cpu)
+{
+	char file[SYSFS_PATH_MAX];
+	struct stat statbuf;
+	int idlestates = 1;
+
+
+	snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpuidle");
+	if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+		return -ENODEV;
+
+	snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU "cpu%u/cpuidle/state0", cpu);
+	if (stat(file, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode))
+		return 0;
+
+	while (stat(file, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
+		snprintf(file, SYSFS_PATH_MAX, PATH_TO_CPU
+			 "cpu%u/cpuidle/state%d", cpu, idlestates);
+		idlestates++;
+	}
+	idlestates--;
+	return idlestates;
+}
+
+/* CPUidle general /sys/devices/system/cpu/cpuidle/ sysfs access ********/
+
+/*
+ * helper function to read file from /sys into given buffer
+ * fname is a relative path under "cpu/cpuidle/" dir
+ */
+static unsigned int sysfs_cpuidle_read_file(const char *fname, char *buf,
+					    size_t buflen)
+{
+	char path[SYSFS_PATH_MAX];
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpuidle/%s", fname);
+
+	return sysfs_read_file(path, buf, buflen);
+}
+
+
+
+/* read access to files which contain one string */
+
+enum cpuidle_string {
+	CPUIDLE_GOVERNOR,
+	CPUIDLE_GOVERNOR_RO,
+	CPUIDLE_DRIVER,
+	MAX_CPUIDLE_STRING_FILES
+};
+
+static const char *cpuidle_string_files[MAX_CPUIDLE_STRING_FILES] = {
+	[CPUIDLE_GOVERNOR]	= "current_governor",
+	[CPUIDLE_GOVERNOR_RO]	= "current_governor_ro",
+	[CPUIDLE_DRIVER]	= "current_driver",
+};
+
+
+static char *sysfs_cpuidle_get_one_string(enum cpuidle_string which)
+{
+	char linebuf[MAX_LINE_LEN];
+	char *result;
+	unsigned int len;
+
+	if (which >= MAX_CPUIDLE_STRING_FILES)
+		return NULL;
+
+	len = sysfs_cpuidle_read_file(cpuidle_string_files[which],
+				linebuf, sizeof(linebuf));
+	if (len == 0)
+		return NULL;
+
+	result = strdup(linebuf);
+	if (result == NULL)
+		return NULL;
+
+	if (result[strlen(result) - 1] == '\n')
+		result[strlen(result) - 1] = '\0';
+
+	return result;
+}
+
+char *sysfs_get_cpuidle_governor(void)
+{
+	char *tmp = sysfs_cpuidle_get_one_string(CPUIDLE_GOVERNOR_RO);
+	if (!tmp)
+		return sysfs_cpuidle_get_one_string(CPUIDLE_GOVERNOR);
+	else
+		return tmp;
+}
+
+char *sysfs_get_cpuidle_driver(void)
+{
+	return sysfs_cpuidle_get_one_string(CPUIDLE_DRIVER);
+}
+/* CPUidle idlestate specific /sys/devices/system/cpu/cpuX/cpuidle/ access */
+
+/*
+ * Get sched_mc or sched_smt settings
+ * Pass "mc" or "smt" as argument
+ *
+ * Returns negative value on failure
+ */
+int sysfs_get_sched(const char *smt_mc)
+{
+	return -ENODEV;
+}
+
+/*
+ * Get sched_mc or sched_smt settings
+ * Pass "mc" or "smt" as argument
+ *
+ * Returns negative value on failure
+ */
+int sysfs_set_sched(const char *smt_mc, int val)
+{
+	return -ENODEV;
+}

tools/power/cpupower/utils/helpers/sysfs.h

@@ -0,0 +1,30 @@
+#ifndef __CPUPOWER_HELPERS_SYSFS_H__
+#define __CPUPOWER_HELPERS_SYSFS_H__
+
+#define PATH_TO_CPU "/sys/devices/system/cpu/"
+#define MAX_LINE_LEN 255
+#define SYSFS_PATH_MAX 255
+
+extern unsigned int sysfs_read_file(const char *path, char *buf, size_t buflen);
+
+extern int sysfs_is_cpu_online(unsigned int cpu);
+
+extern unsigned long sysfs_get_idlestate_latency(unsigned int cpu,
+						unsigned int idlestate);
+extern unsigned long sysfs_get_idlestate_usage(unsigned int cpu,
+					unsigned int idlestate);
+extern unsigned long long sysfs_get_idlestate_time(unsigned int cpu,
+						unsigned int idlestate);
+extern char *sysfs_get_idlestate_name(unsigned int cpu,
+				unsigned int idlestate);
+extern char *sysfs_get_idlestate_desc(unsigned int cpu,
+				unsigned int idlestate);
+extern int sysfs_get_idlestate_count(unsigned int cpu);
+
+extern char *sysfs_get_cpuidle_governor(void);
+extern char *sysfs_get_cpuidle_driver(void);
+
+extern int sysfs_get_sched(const char *smt_mc);
+extern int sysfs_set_sched(const char *smt_mc, int val);
+
+#endif /* __CPUPOWER_HELPERS_SYSFS_H__ */

tools/power/cpupower/utils/helpers/topology.c

@@ -0,0 +1,116 @@
+/*
+ *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ *
+ * ToDo: Needs to be done more properly for AMD/Intel specifics
+ */
+
+/* Helper struct for qsort, must be in sync with cpupower_topology.cpu_info */
+/* Be careful: Need to pass unsigned to the sort, so that offlined cores are
+   in the end, but double check for -1 for offlined cpus at other places */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include <helpers/helpers.h>
+#include <helpers/sysfs.h>
+
+/* returns -1 on failure, 0 on success */
+static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *result)
+{
+	char linebuf[MAX_LINE_LEN];
+	char *endp;
+	char path[SYSFS_PATH_MAX];
+
+	snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s",
+			 cpu, fname);
+	if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
+		return -1;
+	*result = strtol(linebuf, &endp, 0);
+	if (endp == linebuf || errno == ERANGE)
+		return -1;
+	return 0;
+}
+
+static int __compare(const void *t1, const void *t2)
+{
+	struct cpuid_core_info *top1 = (struct cpuid_core_info *)t1;
+	struct cpuid_core_info *top2 = (struct cpuid_core_info *)t2;
+	if (top1->pkg < top2->pkg)
+		return -1;
+	else if (top1->pkg > top2->pkg)
+		return 1;
+	else if (top1->core < top2->core)
+		return -1;
+	else if (top1->core > top2->core)
+		return 1;
+	else if (top1->cpu < top2->cpu)
+		return -1;
+	else if (top1->cpu > top2->cpu)
+		return 1;
+	else
+		return 0;
+}
+
+/*
+ * Returns amount of cpus, negative on error, cpu_top must be
+ * passed to cpu_topology_release to free resources
+ *
+ * Array is sorted after ->pkg, ->core, then ->cpu
+ */
+int get_cpu_topology(struct cpupower_topology *cpu_top)
+{
+	int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF);
+
+	cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus);
+	if (cpu_top->core_info == NULL)
+		return -ENOMEM;
+	cpu_top->pkgs = cpu_top->cores = 0;
+	for (cpu = 0; cpu < cpus; cpu++) {
+		cpu_top->core_info[cpu].cpu = cpu;
+		cpu_top->core_info[cpu].is_online = sysfs_is_cpu_online(cpu);
+		if(sysfs_topology_read_file(
+			cpu,
+			"physical_package_id",
+			&(cpu_top->core_info[cpu].pkg)) < 0)
+			return -1;
+		if(sysfs_topology_read_file(
+			cpu,
+			"core_id",
+			&(cpu_top->core_info[cpu].core)) < 0)
+			return -1;
+	}
+
+	qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info),
+	      __compare);
+
+	/* Count the number of distinct pkgs values. This works
+	   because the primary sort of the core_info struct was just
+	   done by pkg value. */
+	last_pkg = cpu_top->core_info[0].pkg;
+	for(cpu = 1; cpu < cpus; cpu++) {
+		if(cpu_top->core_info[cpu].pkg != last_pkg) {
+			last_pkg = cpu_top->core_info[cpu].pkg;
+			cpu_top->pkgs++;
+		}
+	}
+	cpu_top->pkgs++;
+
+	/* Intel's cores count is not consecutively numbered, there may
+	 * be a core_id of 3, but none of 2. Assume there always is 0
+	 * Get amount of cores by counting duplicates in a package
+	for (cpu = 0; cpu_top->core_info[cpu].pkg = 0 && cpu < cpus; cpu++) {
+		if (cpu_top->core_info[cpu].core == 0)
+	cpu_top->cores++;
+	*/
+	return cpus;
+}
+
+void cpu_topology_release(struct cpupower_topology cpu_top)
+{
+	free(cpu_top.core_info);
+}