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Message-ID: <20230821233048.434531-8-babu.moger@amd.com>
Date: Mon, 21 Aug 2023 18:30:47 -0500
From: Babu Moger <babu.moger@....com>
To: <corbet@....net>, <reinette.chatre@...el.com>,
<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>
CC: <fenghua.yu@...el.com>, <dave.hansen@...ux.intel.com>,
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<akpm@...ux-foundation.org>, <quic_neeraju@...cinc.com>,
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Subject: [PATCH v8 7/8] x86/resctrl: Introduce "-o debug" mount option
Add "-o debug" option to mount resctrl filesystem in debug mode. This
option is used for adding extra files to help resctrl debugging.
Signed-off-by: Babu Moger <babu.moger@....com>
---
Documentation/arch/x86/resctrl.rst | 5 ++++-
arch/x86/kernel/cpu/resctrl/internal.h | 2 ++
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 18 ++++++++++++++++++
3 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index af234681756e..5a2346d2c561 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -35,7 +35,7 @@ about the feature from resctrl's info directory.
To use the feature mount the file system::
- # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps]] /sys/fs/resctrl
+ # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps][,debug]] /sys/fs/resctrl
mount options are:
@@ -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 44ad98f8c7af..2fae6d9e24d3 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)
@@ -306,6 +307,7 @@ struct rdtgroup {
#define RFTYPE_TOP BIT(6)
#define RFTYPE_RES_CACHE BIT(8)
#define RFTYPE_RES_MB BIT(9)
+#define RFTYPE_DEBUG BIT(10)
#define RFTYPE_CTRL_INFO (RFTYPE_INFO | RFTYPE_CTRL)
#define RFTYPE_MON_INFO (RFTYPE_INFO | RFTYPE_MON)
#define RFTYPE_TOP_INFO (RFTYPE_INFO | RFTYPE_TOP)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 98f9f880c30b..94bd69f9964c 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);
@@ -1871,6 +1873,9 @@ static int rdtgroup_add_files(struct kernfs_node *kn, unsigned long fflags)
lockdep_assert_held(&rdtgroup_mutex);
+ if (resctrl_debug)
+ fflags |= RFTYPE_DEBUG;
+
for (rft = rfts; rft < rfts + len; rft++) {
if (rft->fflags && ((fflags & rft->fflags) == rft->fflags)) {
ret = rdtgroup_add_file(kn, rft);
@@ -2379,6 +2384,8 @@ static void rdt_disable_ctx(void)
if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl))
set_mba_sc(false);
+
+ resctrl_debug = false;
}
static int rdt_enable_ctx(struct rdt_fs_context *ctx)
@@ -2403,6 +2410,9 @@ static int rdt_enable_ctx(struct rdt_fs_context *ctx)
goto out_cdpl3;
}
+ if (ctx->enable_debug)
+ resctrl_debug = true;
+
return 0;
out_cdpl3:
@@ -2607,6 +2617,7 @@ enum rdt_param {
Opt_cdp,
Opt_cdpl2,
Opt_mba_mbps,
+ Opt_debug,
nr__rdt_params
};
@@ -2614,6 +2625,7 @@ 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),
{}
};
@@ -2639,6 +2651,9 @@ 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;
@@ -3707,6 +3722,9 @@ 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;
}
--
2.34.1
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