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

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Message-Id: <20200117124620.26094-3-kjain@linux.ibm.com>
Date:   Fri, 17 Jan 2020 18:16:16 +0530
From:   Kajol Jain <kjain@...ux.ibm.com>
To:     acme@...nel.org, mpe@...erman.id.au, linuxppc-dev@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        anju@...ux.vnet.ibm.com, maddy@...ux.vnet.ibm.com,
        ravi.bangoria@...ux.ibm.com, peterz@...radead.org,
        yao.jin@...ux.intel.com, ak@...ux.intel.com, jolsa@...nel.org,
        kan.liang@...ux.intel.com, jmario@...hat.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        paulus@...abs.org, namhyung@...nel.org, mpetlan@...hat.com,
        gregkh@...uxfoundation.org, kjain@...ux.ibm.com,
        benh@...nel.crashing.org
Subject: [RFC 2/6] powerpc/hv-24x7: Add sysfs files inside hv-24x7 device to show processor details

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 <kjain@...ux.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