[PATCH v4 5/7] x86/resctrl: Introduce "-o debug" mount option

Babu Moger
2023-04-17T23:35:42Z

Add "-o debug" option to mount resctrl filesystem in debug mode.
Debug option adds the files for debug purposes.

Signed-off-by: Babu Moger <babu.moger@amd.com>
---
Documentation/x86/resctrl.rst | 3 +++
arch/x86/kernel/cpu/resctrl/internal.h | 1 +
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 13 +++++++++++++
3 files changed, 17 insertions(+)

diff --git a/Documentation/x86/resctrl.rst b/Documentation/x86/resctrl.rst
index f28ed1443a6a..be443251b484 100644
--- a/Documentation/x86/resctrl.rst
+++ b/Documentation/x86/resctrl.rst
@@ -46,6 +46,9 @@ mount options are:
"mba_MBps":
Enable the MBA Software Controller(mba_sc) to specify MBA
bandwidth in MBps
+"debug":
+ Make debug files accessible. Available debug files are annotated with
+ "Available only with debug option".

L2 and L3 CDP are controlled separately.

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 75ddbd833fdf..1eac07ebc31b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -59,6 +59,7 @@ struct rdt_fs_context {
bool enable_cdpl2;
bool enable_cdpl3;
bool enable_mba_mbps;
+ bool enable_debug;
};

static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 719e29248892..0169821bc08c 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -56,6 +56,8 @@ static char last_cmd_status_buf[512];

struct dentry *debugfs_resctrl;

+static bool resctrl_debug;
+
void rdt_last_cmd_clear(void)
{
lockdep_assert_held(&rdtgroup_mutex);
@@ -2387,6 +2389,9 @@ static int rdt_enable_ctx(struct rdt_fs_context *ctx)
if (!ret && ctx->enable_mba_mbps)
ret = set_mba_sc(true);

+ if (!ret && ctx->enable_debug)
+ resctrl_debug = true;
+
return ret;
}

@@ -2575,6 +2580,7 @@ enum rdt_param {
Opt_cdp,
Opt_cdpl2,
Opt_mba_mbps,
+ Opt_debug,
nr__rdt_params
};

@@ -2582,6 +2588,7 @@ static const struct fs_parameter_spec rdt_fs_parameters[] = {
fsparam_flag("cdp", Opt_cdp),
fsparam_flag("cdpl2", Opt_cdpl2),
fsparam_flag("mba_MBps", Opt_mba_mbps),
+ fsparam_flag("debug", Opt_debug),
{}
};

@@ -2607,6 +2614,9 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
return -EINVAL;
ctx->enable_mba_mbps = true;
return 0;
+ case Opt_debug:
+ ctx->enable_debug = true;
+ return 0;
}

return -EINVAL;
@@ -3549,6 +3559,9 @@ static int rdtgroup_show_options(struct seq_file *seq, struct kernfs_root *kf)
if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
seq_puts(seq, ",mba_MBps");

+ if (resctrl_debug)
+ seq_puts(seq, ",debug");
+
return 0;
}