x86/intel_rdt: Make information files resource specific

Cache allocation and memory bandwidth allocation require different
information files in the resctrl/info directory, but the current
implementation does not allow to have files per resource.

Add the necessary fields to the resource struct and assign the files
dynamically depending on the resource type.

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: vikas.shivappa@intel.com
Link: http://lkml.kernel.org/r/1491611637-20417-6-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/include/asm/intel_rdt.h

@@ -150,6 +150,8 @@ struct rdt_membw {
  * @data_width:		Character width of data when displaying
  * @domains:		All domains for this resource
  * @cache:		Cache allocation related data
+ * @info_files:		resctrl info files for the resource
+ * @nr_info_files:	Number of info files
  */
 struct rdt_resource {
 	bool			enabled;
@@ -167,8 +169,12 @@ struct rdt_resource {
 		struct rdt_cache	cache;
 		struct rdt_membw	membw;
 	};
+	struct rftype		*info_files;
+	int			nr_info_files;
 };
 
+void rdt_get_cache_infofile(struct rdt_resource *r);
+
 extern struct mutex rdtgroup_mutex;
 
 extern struct rdt_resource rdt_resources_all[];

arch/x86/kernel/cpu/intel_rdt.c

@@ -221,6 +221,7 @@ static void rdt_get_cache_config(int idx, struct rdt_resource *r)
 	r->cache.cbm_len = eax.split.cbm_len + 1;
 	r->default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
 	r->data_width = (r->cache.cbm_len + 3) / 4;
+	rdt_get_cache_infofile(r);
 	r->capable = true;
 	r->enabled = true;
 }

arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

@@ -540,7 +540,7 @@ static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
 }
 
 /* rdtgroup information files for one cache resource. */
-static struct rftype res_info_files[] = {
+static struct rftype res_cache_info_files[] = {
 	{
 		.name		= "num_closids",
 		.mode		= 0444,
@@ -561,11 +561,18 @@ static struct rftype res_info_files[] = {
 	},
 };
 
+void rdt_get_cache_infofile(struct rdt_resource *r)
+{
+	r->info_files = res_cache_info_files;
+	r->nr_info_files = ARRAY_SIZE(res_cache_info_files);
+}
+
 static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 {
 	struct kernfs_node *kn_subdir;
+	struct rftype *res_info_files;
 	struct rdt_resource *r;
-	int ret;
+	int ret, len;
 
 	/* create the directory */
 	kn_info = kernfs_create_dir(parent_kn, "info", parent_kn->mode, NULL);
@@ -584,8 +591,11 @@ static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
 		ret = rdtgroup_kn_set_ugid(kn_subdir);
 		if (ret)
 			goto out_destroy;
-		ret = rdtgroup_add_files(kn_subdir, res_info_files,
-					 ARRAY_SIZE(res_info_files));
+
+		res_info_files = r->info_files;
+		len = r->nr_info_files;
+
+		ret = rdtgroup_add_files(kn_subdir, res_info_files, len);
 		if (ret)
 			goto out_destroy;
 		kernfs_activate(kn_subdir);