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, 44 insertions, 0 deletions

diff --git a/tools/power/cpupower/utils/helpers/pci.c b/tools/power/cpupower/utils/helpers/pci.c
new file mode 100644
index 000000000000..8dcc93813716
--- /dev/null
+++ b/tools/power/cpupower/utils/helpers/pci.c
@@ -0,0 +1,44 @@
+#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
+ *
+ * vendor_id : the pci vendor id matching the pci device to access
+ * dev_ids :   device ids matching the pci device to access
+ *
+ * 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 vendor_id,
+				    int *dev_ids)
+{
+	struct pci_filter filter_nb_link = { -1, -1, -1, -1, vendor_id, 0};
+	struct pci_dev *device;
+	unsigned int i;
+
+	*pacc = pci_alloc();
+	if (*pacc == NULL)
+		return NULL;
+
+	pci_init(*pacc);
+	pci_scan_bus(*pacc);
+
+	for (i = 0; dev_ids[i] != 0; i++) {
+		filter_nb_link.device = dev_ids[i];
+		for (device=(*pacc)->devices; device; device = device->next) {
+			if (pci_filter_match(&filter_nb_link, device))
+				return device;
+		}
+	}
+	pci_cleanup(*pacc);
+	return NULL;
+}
+#endif /* defined(__i386__) || defined(__x86_64__) */