[tip:ras/core] RAS/CEC: Add CONFIG_RAS_CEC_DEBUG and move CEC debug features there

[tip-bot for Tony Luck]

Commit-ID:  60fd42d26cc7ec8847598da50ebf27e3c9647d7b
Gitweb:     https://git.kernel.org/tip/60fd42d26cc7ec8847598da50ebf27e3c9647d7b
Author:     Tony Luck <tony.l...@intel.com>
AuthorDate: Mon, 6 May 2019 13:13:22 +0200
Committer:  Borislav Petkov <b...@suse.de>
CommitDate: Sat, 8 Jun 2019 17:39:24 +0200

RAS/CEC: Add CONFIG_RAS_CEC_DEBUG and move CEC debug features there

The pfn and array files in (debugfs)/ras/cec are intended for debugging
the CEC code itself. They are not needed on production systems, so the
default setting for this CONFIG option is "n".

 [ bp: Have it with less ifdeffery by using IS_ENABLED(). ]

Signed-off-by: Tony Luck <tony.l...@intel.com>
Signed-off-by: Borislav Petkov <b...@suse.de>
---
 arch/x86/ras/Kconfig | 10 ++++++++++
 drivers/ras/cec.c    | 26 ++++++++++++++------------
 2 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/arch/x86/ras/Kconfig b/arch/x86/ras/Kconfig
index a9c3db125222..9ad6842de4b4 100644
--- a/arch/x86/ras/Kconfig
+++ b/arch/x86/ras/Kconfig
@@ -11,3 +11,13 @@ config RAS_CEC
 
          Bear in mind that this is absolutely useless if your platform doesn't
          have ECC DIMMs and doesn't have DRAM ECC checking enabled in the BIOS.
+
+config RAS_CEC_DEBUG
+       bool "CEC debugging machinery"
+       default n
+       depends on RAS_CEC
+       help
+         Add extra files to (debugfs)/ras/cec to test the correctable error
+         collector feature. "pfn" is a writable file that allows user to
+         simulate an error in a particular page frame. "array" is a read-only
+         file that dumps out the current state of all pages logged so far.
diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index dc08c705b493..0907dc6f4afe 100644
--- a/drivers/ras/cec.c
+++ b/drivers/ras/cec.c
@@ -486,18 +486,6 @@ static int __init create_debugfs_nodes(void)
                return -1;
        }
 
-       pfn = debugfs_create_file("pfn", S_IRUSR | S_IWUSR, d, &dfs_pfn, 
&pfn_ops);
-       if (!pfn) {
-               pr_warn("Error creating pfn debugfs node!\n");
-               goto err;
-       }
-
-       array = debugfs_create_file("array", S_IRUSR, d, NULL, &array_ops);
-       if (!array) {
-               pr_warn("Error creating array debugfs node!\n");
-               goto err;
-       }
-
        decay = debugfs_create_file("decay_interval", S_IRUSR | S_IWUSR, d,
                                    &decay_interval, &decay_interval_ops);
        if (!decay) {
@@ -512,6 +500,20 @@ static int __init create_debugfs_nodes(void)
                goto err;
        }
 
+       if (!IS_ENABLED(CONFIG_RAS_CEC_DEBUG))
+               return 0;
+
+       pfn = debugfs_create_file("pfn", S_IRUSR | S_IWUSR, d, &dfs_pfn, 
&pfn_ops);
+       if (!pfn) {
+               pr_warn("Error creating pfn debugfs node!\n");
+               goto err;
+       }
+
+       array = debugfs_create_file("array", S_IRUSR, d, NULL, &array_ops);
+       if (!array) {
+               pr_warn("Error creating array debugfs node!\n");
+               goto err;
+       }
 
        return 0;