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| author | Shaohua Li <shli@fb.com> | 2016-11-03 14:09:06 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-11-07 12:20:52 +0100 |
| commit | 53a114a69095eeb0e15d04c2a82358b3192f88df (patch) | |
| tree | d0de73b0ed7c0b6804190e9dead7141a827d01e5 /arch | |
| parent | 7bff0af51012500718971f9cc3485f67252353eb (diff) | |
| download | linux-stable-53a114a69095eeb0e15d04c2a82358b3192f88df.tar.gz linux-stable-53a114a69095eeb0e15d04c2a82358b3192f88df.tar.bz2 linux-stable-53a114a69095eeb0e15d04c2a82358b3192f88df.zip | |
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@fb.com>
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 <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 16 |
1 files changed, 16 insertions, 0 deletions
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) |