Bluetooth: Export SMP selftest result in debugfs

When SMP selftest is enabled, then besides printing the result into the
kernel message buffer, also create a debugfs file that allows retrieving
the same information.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 1910c58..1ab3dc9 100644 (file)
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -3549,6 +3549,21 @@ static int __init test_h6(struct crypto_hash *tfm_cmac)
        return 0;
 }
 
+static char test_smp_buffer[32];
+
+static ssize_t test_smp_read(struct file *file, char __user *user_buf,
+                            size_t count, loff_t *ppos)
+{
+       return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer,
+                                      strlen(test_smp_buffer));
+}
+
+static const struct file_operations test_smp_fops = {
+       .open           = simple_open,
+       .read           = test_smp_read,
+       .llseek         = default_llseek,
+};
+
 static int __init run_selftests(struct crypto_blkcipher *tfm_aes,
                                struct crypto_hash *tfm_cmac)
 {
@@ -3561,49 +3576,49 @@ static int __init run_selftests(struct crypto_blkcipher *tfm_aes,
        err = test_ah(tfm_aes);
        if (err) {
                BT_ERR("smp_ah test failed");
-               return err;
+               goto done;
        }
 
        err = test_c1(tfm_aes);
        if (err) {
                BT_ERR("smp_c1 test failed");
-               return err;
+               goto done;
        }
 
        err = test_s1(tfm_aes);
        if (err) {
                BT_ERR("smp_s1 test failed");
-               return err;
+               goto done;
        }
 
        err = test_f4(tfm_cmac);
        if (err) {
                BT_ERR("smp_f4 test failed");
-               return err;
+               goto done;
        }
 
        err = test_f5(tfm_cmac);
        if (err) {
                BT_ERR("smp_f5 test failed");
-               return err;
+               goto done;
        }
 
        err = test_f6(tfm_cmac);
        if (err) {
                BT_ERR("smp_f6 test failed");
-               return err;
+               goto done;
        }
 
        err = test_g2(tfm_cmac);
        if (err) {
                BT_ERR("smp_g2 test failed");
-               return err;
+               goto done;
        }
 
        err = test_h6(tfm_cmac);
        if (err) {
                BT_ERR("smp_h6 test failed");
-               return err;
+               goto done;
        }
 
        rettime = ktime_get();
@@ -3612,7 +3627,17 @@ static int __init run_selftests(struct crypto_blkcipher *tfm_aes,
 
        BT_INFO("SMP test passed in %llu usecs", duration);
 
-       return 0;
+done:
+       if (!err)
+               snprintf(test_smp_buffer, sizeof(test_smp_buffer),
+                        "PASS (%llu usecs)\n", duration);
+       else
+               snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n");
+
+       debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL,
+                           &test_smp_fops);
+
+       return err;
 }
 
 int __init bt_selftest_smp(void)