ice: fix issue with losing ICE key configuration during reset

TZ is called to restore key configuration in case of UFS reset

Change-Id: Id434e7f9ec6befdce97f52fd350957b66adcb15f
Signed-off-by: Andrey Markovytch <andreym@codeaurora.org>

3 files changed, 39 insertions, 2 deletions

diff --git a/security/pfe/pfk.c b/security/pfe/pfk.c
index 7e38c9fbf171..2e5aa2fb6688 100644
--- a/security/pfe/pfk.c
+++ b/security/pfe/pfk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -476,6 +476,18 @@ bool pfk_allow_merge_bio(const struct bio *bio1, const struct bio *bio2)
 	return (*(pfk_allow_merge_bio_ftable[which_pfe1]))(bio1, bio2,
 		inode1, inode2);
 }
+/**
+ * Flush key table on storage core reset. During core reset key configuration
+ * is lost in ICE. We need to flash the cache, so that the keys will be
+ * reconfigured again for every subsequent transaction
+ */
+void pfk_clear_on_reset(void)
+{
+	if (!pfk_is_ready())
+		return;
+
+	pfk_kc_clear_on_reset();
+}
 
 module_init(pfk_init);
 module_exit(pfk_exit);
diff --git a/security/pfe/pfk_kc.c b/security/pfe/pfk_kc.c
index cd3f08b3959d..39e67569a1dd 100644
--- a/security/pfe/pfk_kc.c
+++ b/security/pfe/pfk_kc.c
@@ -826,3 +826,27 @@ out:
 
 	return res;
 }
+
+/**
+ * pfk_kc_clear_on_reset() - clear the table and remove all keys from ICE
+ * The assumption is that at this point we don't have any pending transactions
+ * Also, there is no need to clear keys from ICE
+ *
+ * Return 0 on success, error otherwise
+ *
+ */
+void pfk_kc_clear_on_reset(void)
+{
+	struct kc_entry *entry = NULL;
+	int i = 0;
+
+	if (!kc_is_ready())
+		return;
+
+	kc_spin_lock();
+	for (i = 0; i < PFK_KC_TABLE_SIZE; i++) {
+		entry = kc_entry_at_index(i);
+		kc_clear_entry(entry);
+	}
+	kc_spin_unlock();
+}
diff --git a/security/pfe/pfk_kc.h b/security/pfe/pfk_kc.h
index ce3fac7edbbe..0b0ec8825c15 100644
--- a/security/pfe/pfk_kc.h
+++ b/security/pfe/pfk_kc.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2015-2017, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -26,6 +26,7 @@ int pfk_kc_remove_key_with_salt(const unsigned char *key, size_t key_size,
 		const unsigned char *salt, size_t salt_size);
 int pfk_kc_remove_key(const unsigned char *key, size_t key_size);
 int pfk_kc_clear(void);
+void pfk_kc_clear_on_reset(void);