From 53a114a69095eeb0e15d04c2a82358b3192f88df Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Thu, 3 Nov 2016 14:09:06 -0700 Subject: [PATCH] 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 Cc: fenghua.yu@intel.com Cc: tony.luck@intel.com Link: http://lkml.kernel.org/r/e69b1ffa206d0353eea58101e1bf9b677d9732f7.1478207143.git.shli@fb.com Signed-off-by: Thomas Gleixner --- 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 e66c7a58505e..4795880274f9 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) -- 2.39.5