This provides a basic link between perf and hv_gpci. Notably, it does
not yet support transactions and does not list any events (they can
still be manually composed).
Signed-off-by: Cody P Schafer c...@linux.vnet.ibm.com
---
arch/powerpc/perf/hv-gpci.c | 290
1 file changed, 290 insertions(+)
create mode 100644 arch/powerpc/perf/hv-gpci.c
diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c
new file mode 100644
index 000..1f5d96d
--- /dev/null
+++ b/arch/powerpc/perf/hv-gpci.c
@@ -0,0 +1,290 @@
+/*
+ * Hypervisor supplied gpci (get performance counter info) performance
+ * counter support
+ *
+ * Author: Cody P Schafer c...@linux.vnet.ibm.com
+ * Copyright 2014 IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#define pr_fmt(fmt) hv-gpci: fmt
+
+#include linux/init.h
+#include linux/perf_event.h
+#include asm/firmware.h
+#include asm/hvcall.h
+#include asm/io.h
+
+#include hv-gpci.h
+#include hv-common.h
+
+PMU_RANGE_ATTR(request, config, 0, 31); /* u32 */
+PMU_RANGE_ATTR(starting_index, config, 32, 63); /* u32 */
+PMU_RANGE_ATTR(secondary_index, config1, 0, 15); /* u16 */
+PMU_RANGE_ATTR(counter_info_version, config1, 16, 23); /* u8 */
+PMU_RANGE_ATTR(length, config1, 24, 31); /* u8, bytes of data (1-8) */
+PMU_RANGE_ATTR(offset, config1, 32, 63); /* u32, byte offset */
+
+static struct attribute *format_attrs[] = {
+ format_attr_request.attr,
+ format_attr_starting_index.attr,
+ format_attr_secondary_index.attr,
+ format_attr_counter_info_version.attr,
+
+ format_attr_offset.attr,
+ format_attr_length.attr,
+ NULL,
+};
+
+static struct attribute_group format_group = {
+ .name = format,
+ .attrs = format_attrs,
+};
+
+#define HV_CAPS_ATTR(_name, _format) \
+static ssize_t _name##_show(struct device *dev,\
+ struct device_attribute *attr, \
+ char *page) \
+{ \
+ struct hv_perf_caps caps; \
+ unsigned long hret = hv_perf_caps_get(caps); \
+ if (hret) \
+ return -EIO;\
+ \
+ return sprintf(page, _format, caps._name); \
+} \
+static struct device_attribute hv_caps_attr_##_name = __ATTR_RO(_name)
+
+static ssize_t kernel_version_show(struct device *dev,
+ struct device_attribute *attr,
+ char *page)
+{
+ return sprintf(page, 0x%x\n, COUNTER_INFO_VERSION_CURRENT);
+}
+
+DEVICE_ATTR_RO(kernel_version);
+HV_CAPS_ATTR(version, 0x%x\n);
+HV_CAPS_ATTR(ga, %d\n);
+HV_CAPS_ATTR(expanded, %d\n);
+HV_CAPS_ATTR(lab, %d\n);
+HV_CAPS_ATTR(collect_privileged, %d\n);
+
+static struct attribute *interface_attrs[] = {
+ dev_attr_kernel_version.attr,
+ hv_caps_attr_version.attr,
+ hv_caps_attr_ga.attr,
+ hv_caps_attr_expanded.attr,
+ hv_caps_attr_lab.attr,
+ hv_caps_attr_collect_privileged.attr,
+ NULL,
+};
+
+static struct attribute_group interface_group = {
+ .name = interface,
+ .attrs = interface_attrs,
+};
+
+static const struct attribute_group *attr_groups[] = {
+ format_group,
+ interface_group,
+ NULL,
+};
+
+#define GPCI_MAX_DATA_BYTES \
+ (1024 - sizeof(struct hv_get_perf_counter_info_params))
+
+static unsigned long single_gpci_request(u32 req, u32 starting_index,
+ u16 secondary_index, u8 version_in, u32 offset, u8 length,
+ u64 *value)
+{
+ unsigned long ret;
+ size_t i;
+ u64 count;
+
+ struct {
+ struct hv_get_perf_counter_info_params params;
+ uint8_t bytes[GPCI_MAX_DATA_BYTES];
+ } __packed __aligned(sizeof(uint64_t)) arg = {
+ .params = {
+ .counter_request = cpu_to_be32(req),
+ .starting_index = cpu_to_be32(starting_index),
+ .secondary_index = cpu_to_be16(secondary_index),
+ .counter_info_version_in = version_in,
+ }
+ };
+
+ ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO,
+ virt_to_phys(arg), sizeof(arg));
+ if (ret) {
+ pr_devel(hcall failed: 0x%lx\n, ret);
+ return ret;
+ }
+
+ /*
+* we verify offset and length are within the zeroed buffer
