Commit-ID: 53a114a69095eeb0e15d04c2a82358b3192f88df
Gitweb: http://git.kernel.org/tip/53a114a69095eeb0e15d04c2a82358b3192f88df
Author: Shaohua Li <shli@xxxxxx>
AuthorDate: Thu, 3 Nov 2016 14:09:06 -0700
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 7 Nov 2016 12:20:52 +0100
x86/intel_rdt: Export the minimum number of set mask bits in sysfs
The minimum number of bits set for a cache mask is checked by the kernel
when writing a mask, but there is no way for the user to retrieve this
information.
Add a new file 'min_cbm_bits' to the info directory and export the
information to user space.
[ tglx: Massaged changelog ]
Signed-off-by: Shaohua Li <shli@xxxxxx>
Cc: fenghua.yu@xxxxxxxxx
Cc: tony.luck@xxxxxxxxx
Link: http://lkml.kernel.org/r/e69b1ffa206d0353eea58101e1bf9b677d9732f7.1478207143.git.shli@xxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index e66c7a5..4795880 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -472,6 +472,16 @@ static int rdt_cbm_mask_show(struct kernfs_open_file *of,
return 0;
}
+static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+
+ seq_printf(seq, "%d\n", r->min_cbm_bits);
+
+ return 0;
+}
+
/* rdtgroup information files for one cache resource. */
static struct rftype res_info_files[] = {
{
@@ -486,6 +496,12 @@ static struct rftype res_info_files[] = {
.kf_ops = &rdtgroup_kf_single_ops,
.seq_show = rdt_cbm_mask_show,
},
+ {
+ .name = "min_cbm_bits",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_min_cbm_bits_show,
+ },
};
static int rdtgroup_create_info_dir(struct kernfs_node *parent_kn)
--
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