x86/intel_rdt: Update schemata read to show data in tabular format

The schemata file displays data from different resources on all
domains. Its cumbersome to read since they are not tabular and data/names
could be of different widths.  Make the schemata file to display data in a
tabular format thereby making it nice and simple to read.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: vikas.shivappa@intel.com
Cc: h.peter.anvin@intel.com
Link: http://lkml.kernel.org/r/1491255857-17213-4-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index 329b8876b984..70a3307fd592 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -39,6 +39,12 @@ DEFINE_PER_CPU_READ_MOSTLY(int, cpu_closid);
 
 #define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].domains)
 
+/*
+ * Used to store the max resource name width and max resource data width
+ * to display the schemata in a tabular format
+ */
+int max_name_width, max_data_width;
+
 struct rdt_resource rdt_resources_all[] = {
 	{
 		.name		= "L3",
@@ -140,6 +146,7 @@ static void rdt_get_config(int idx, struct rdt_resource *r)
 	r->num_closid = edx.split.cos_max + 1;
 	r->cbm_len = eax.split.cbm_len + 1;
 	r->max_cbm = BIT_MASK(eax.split.cbm_len + 1) - 1;
+	r->data_width = (r->cbm_len + 3) / 4;
 	r->capable = true;
 	r->enabled = true;
 }
@@ -152,6 +159,7 @@ static void rdt_get_cdp_l3_config(int type)
 	r->num_closid = r_l3->num_closid / 2;
 	r->cbm_len = r_l3->cbm_len;
 	r->max_cbm = r_l3->max_cbm;
+	r->data_width = (r->cbm_len + 3) / 4;
 	r->capable = true;
 	/*
 	 * By default, CDP is disabled. CDP can be enabled by mount parameter
@@ -160,6 +168,26 @@ static void rdt_get_cdp_l3_config(int type)
 	r->enabled = false;
 }
 
+/**
+ * Choose a width for the resource name
+ * and resource data based on the resource that has
+ * widest name and cbm.
+ */
+static void rdt_init_padding(void)
+{
+	struct rdt_resource *r;
+	int cl;
+
+	for_each_enabled_rdt_resource(r) {
+		cl = strlen(r->name);
+		if (cl > max_name_width)
+			max_name_width = cl;
+
+		if (r->data_width > max_data_width)
+			max_data_width = r->data_width;
+	}
+}
+
 static inline bool get_rdt_resources(void)
 {
 	bool ret = false;
@@ -184,6 +212,8 @@ static inline bool get_rdt_resources(void)
 		ret = true;
 	}
 
+	rdt_init_padding();
+
 	return ret;
 }