[RFC 2/6] powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show processor details

[Kajol Jain]

To expose the system dependent parameter like total number of
sockets and numbers of chips per socket, patch adds two sysfs files.
"sockets" and "chips" are added to /sys/devices/hv_24x7/interface/
of the "hv_24x7" pmu.

Signed-off-by: Kajol Jain <kj...@linux.ibm.com>
---
 arch/powerpc/perf/hv-24x7.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 64d9fc526d68..e498824eb4f7 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -450,6 +450,20 @@ static ssize_t device_show_string(struct device *dev,
        return sprintf(buf, "%s\n", (char *)d->var);
 }
 
+#ifdef CONFIG_PPC_RTAS
+static ssize_t sockets_show(struct device *dev,
+                           struct device_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%d\n", physsockets);
+}
+
+static ssize_t chips_show(struct device *dev, struct device_attribute *attr,
+                         char *buf)
+{
+       return sprintf(buf, "%d\n", physchips);
+}
+#endif
+
 static struct attribute *device_str_attr_create_(char *name, char *str)
 {
        struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL);
@@ -1096,6 +1110,10 @@ PAGE_0_ATTR(catalog_len, "%lld\n",
                (unsigned long long)be32_to_cpu(page_0->length) * 4096);
 static BIN_ATTR_RO(catalog, 0/* real length varies */);
 static DEVICE_ATTR_RO(domains);
+#ifdef CONFIG_PPC_RTAS
+static DEVICE_ATTR_RO(sockets);
+static DEVICE_ATTR_RO(chips);
+#endif
 
 static struct bin_attribute *if_bin_attrs[] = {
        &bin_attr_catalog,
@@ -1106,6 +1124,10 @@ static struct attribute *if_attrs[] = {
        &dev_attr_catalog_len.attr,
        &dev_attr_catalog_version.attr,
        &dev_attr_domains.attr,
+#ifdef CONFIG_PPC_RTAS
+       &dev_attr_sockets.attr,
+       &dev_attr_chips.attr,
+#endif
        NULL,
 };
 
-- 
2.18.1