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Subject: [PATCH v5 8/8] x86/resctrl: Introduce RFTYPE_DEBUG flag
From:   Babu Moger <babu.moger@amd.com>
To:     <corbet@lwn.net>, <reinette.chatre@intel.com>,
        <tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>
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Date:   Thu, 1 Jun 2023 14:02:16 -0500
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Introduce RFTYPE_DEBUG flag which can be used to add files when=0A=
resctrl is mounted with "-o debug" option. RFTYPE_DEBUG is OR'd=0A=
with other RFTYPE_ flags. These other flags decide where in resctrl=0A=
structure these files should be created.=0A=
=0A=
Signed-off-by: Babu Moger <babu.moger@amd.com>=0A=
---=0A=
 arch/x86/kernel/cpu/resctrl/internal.h |    1 +=0A=
 arch/x86/kernel/cpu/resctrl/rdtgroup.c |    5 +++++=0A=
 2 files changed, 6 insertions(+)=0A=
=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r=
esctrl/internal.h=0A=
index c07c6517d856..5bc8d371fc3e 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/internal.h=0A=
+++ b/arch/x86/kernel/cpu/resctrl/internal.h=0A=
@@ -294,6 +294,7 @@ struct rdtgroup {=0A=
 #define RFTYPE_TOP			BIT(6)=0A=
 #define RFTYPE_RES_CACHE		BIT(8)=0A=
 #define RFTYPE_RES_MB			BIT(9)=0A=
+#define RFTYPE_DEBUG			BIT(10)=0A=
 #define RFTYPE_CTRL_INFO		(RFTYPE_INFO | RFTYPE_CTRL)=0A=
 #define RFTYPE_MON_INFO			(RFTYPE_INFO | RFTYPE_MON)=0A=
 #define RFTYPE_TOP_INFO			(RFTYPE_INFO | RFTYPE_TOP)=0A=
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r=
esctrl/rdtgroup.c=0A=
index e03cb01c4742..9e42ecbb9063 100644=0A=
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c=0A=
@@ -1862,6 +1862,7 @@ static struct rftype res_common_files[] =3D {=0A=
 		.mode		=3D 0444,=0A=
 		.kf_ops		=3D &rdtgroup_kf_single_ops,=0A=
 		.seq_show	=3D rdtgroup_rmid_show,=0A=
+		.fflags		=3D RFTYPE_BASE | RFTYPE_DEBUG,=0A=
 	},=0A=
 	{=0A=
 		.name		=3D "schemata",=0A=
@@ -1891,6 +1892,7 @@ static struct rftype res_common_files[] =3D {=0A=
 		.mode		=3D 0444,=0A=
 		.kf_ops		=3D &rdtgroup_kf_single_ops,=0A=
 		.seq_show	=3D rdtgroup_closid_show,=0A=
+		.fflags		=3D RFTYPE_CTRL_BASE | RFTYPE_DEBUG,=0A=
 	},=0A=
 =0A=
 };=0A=
@@ -1905,6 +1907,9 @@ static int rdtgroup_add_files(struct kernfs_node *kn,=
 unsigned long fflags)=0A=
 =0A=
 	lockdep_assert_held(&rdtgroup_mutex);=0A=
 =0A=
+	if (resctrl_debug)=0A=
+		fflags |=3D RFTYPE_DEBUG;=0A=
+=0A=
 	for (rft =3D rfts; rft < rfts + len; rft++) {=0A=
 		if (rft->fflags && ((fflags & rft->fflags) =3D=3D rft->fflags)) {=0A=
 			ret =3D rdtgroup_add_file(kn, rft);=0A=
=0A=