linux-kernel - [PATCH 5/8] x86/intel_rdt: info file support for MBA prepare

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Date:   Fri, 17 Feb 2017 11:58:52 -0800
From:   Vikas Shivappa <vikas.shivappa@...ux.intel.com>
To:     vikas.shivappa@...el.com
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
        tglx@...utronix.de, mingo@...nel.org, peterz@...radead.org,
        ravi.v.shankar@...el.com, tony.luck@...el.com,
        fenghua.yu@...el.com, andi.kleen@...el.com,
        vikas.shivappa@...ux.intel.com
Subject: [PATCH 5/8] x86/intel_rdt: info file support for MBA prepare

As a preparatory patch to MBA info file setup, generalize the info file
setup to have the option to choose between different set of files.
Although multiple cache resources have same info files, Memory resources
have different set of info files. That way we have the option to choose
between memory resource and cache resource info files.

Signed-off-by: Vikas Shivappa <vikas.shivappa@...ux.intel.com>
---
 arch/x86/include/asm/intel_rdt.h         |  5 +++++
 arch/x86/kernel/cpu/intel_rdt.c          |  1 +
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 18 ++++++++++++++----
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/intel_rdt.h b/arch/x86/include/asm/intel_rdt.h
index af65b2a..36abed2 100644
--- a/arch/x86/include/asm/intel_rdt.h
+++ b/arch/x86/include/asm/intel_rdt.h
@@ -77,6 +77,8 @@ struct rftype {
  * @default_ctrl:		Specifies default cache cbm or mem b/w percent.
  * @min_cbm_bits:		Minimum number of consecutive bits to be set
  *				in a cache bit mask
+ * @info_files:		resctrl info files for the resource
+ * @infofiles_len:		Number of info files
  * @max_delay:			Max throttle delay. Delay is the hardware
  *				understandable value for memory b/w.
  * @min_bw:			Minimum memory bandwidth in percentage
@@ -103,6 +105,8 @@ struct rdt_resource {
 	int			cbm_len;
 	int			min_cbm_bits;
 	u32			default_ctrl;
+	struct rftype		*info_files;
+	int			infofiles_len;
 	u32			max_delay;
 	u32			min_bw;
 	u32			bw_gran;
@@ -144,6 +148,7 @@ struct msr_param {
 	int			high;
 };
 
+void rdt_get_cache_infofile(struct rdt_resource *r);
 extern struct mutex rdtgroup_mutex;
 
 extern struct rdt_resource rdt_resources_all[];
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index 130ce98..481ff32 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -193,6 +193,7 @@ static void rdt_get_cache_config(int idx, struct rdt_resource *r)
 	r->num_closid = edx.split.cos_max + 1;
 	r->cbm_len = eax.split.cbm_len + 1;
 	r->default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
+	rdt_get_cache_infofile(r);
 	r->capable = true;
 	r->enabled = true;
 }
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 0d8fa61..0a70e87 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -519,7 +519,7 @@ 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,
@@ -540,11 +540,18 @@ static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
 	},
 };
 
+void rdt_get_cache_infofile(struct rdt_resource *r)
+{
+	r->info_files = &res_cache_info_files[0];
+	r->infofiles_len = 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);
@@ -563,8 +570,11 @@ 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->infofiles_len;
+
+		ret = rdtgroup_add_files(kn_subdir, res_info_files, len);
 		if (ret)
 			goto out_destroy;
 		kernfs_activate(kn_subdir);
-- 
1.9.1