[PATCH v3 00/16] block: sed-opal: support shadow MBR done flag and write

[PATCH v3 00/16] block: sed-opal: support shadow MBR done flag and write

[David Kozub]

This patch series extends OPAL support: it adds IOCTL for setting the shadow
MBR done flag which can be useful for unlocking an OPAL disk on boot and it adds
IOCTL for writing to the shadow MBR. Also included are some minor fixes and
improvements.

This series is based on the original work done by Jonas Rabenstein which was
submitted in March 2018.[1] I tried to apply suggestions made in review on the
list and do some further improvements.

The most contentious issue in the original series was the IOCTL for shadow MBR
write but I think no better approach was found[2] so this was not changed. I'm
open to suggestions.

There is a fork of sed-opal-temp that can use these new IOCTLs.[3] I tested
these on Samsung 840 EVO and 850 EVO drives, on x86-64 and arm64 systems.

The series applies on v5.0-rc3.

Changes from v2 to v3:
* review suggestions from Scott Bauer

As Scott suggested I tried to do a more thorough testing, esp. with things like
wrong passwords/invalid values. I did not observe any crash or unexpected
behavior.

David Kozub (8):
  block: sed-opal: fix typos and formatting
  block: sed-opal: close parameter list in cmd_finalize
  block: sed-opal: unify cmd start
  block: sed-opal: unify error handling of responses
  block: sed-opal: reuse response_get_token to decrease code duplication
  block: sed-opal: pass steps via argument rather than via opal_dev
  block: sed-opal: don't repeat opal_discovery0 in each steps array
  block: sed-opal: rename next to execute_steps

Jonas Rabenstein (8):
  block: sed-opal: use correct macro for method length
  block: sed-opal: unify space check in add_token_*
  block: sed-opal: print failed function address
  block: sed-opal: split generation of bytestring header and content
  block: sed-opal: add ioctl for done-mark of shadow mbr
  block: sed-opal: ioctl for writing to shadow mbr
  block: sed-opal: unify retrieval of table columns
  block: sed-opal: check size of shadow mbr

 block/opal_proto.h            |  18 +
 block/sed-opal.c              | 845 +++++++++++++++++-----------------
 include/linux/sed-opal.h      |   2 +
 include/uapi/linux/sed-opal.h |   9 +
 4 files changed, 451 insertions(+), 423 deletions(-)

-- 
2.20.1

[PATCH v3 01/16] block: sed-opal: fix typos and formatting

[David Kozub]

This should make no change in functionality.
The formatting changes were triggered by checkpatch.pl.

Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
---
 block/sed-opal.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index e0de4dd448b3..c882a193e162 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -11,8 +11,8 @@
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ":OPAL: " fmt
@@ -157,7 +157,7 @@ static const u8 opaluid[][OPAL_UID_LENGTH] = {
 
 	/* C_PIN_TABLE object ID's */
 
-        [OPAL_C_PIN_MSID] =
+	[OPAL_C_PIN_MSID] =
 		{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x84, 0x02},
 	[OPAL_C_PIN_SID] =
 		{ 0x00, 0x00, 0x00, 0x0B, 0x00, 0x00, 0x00, 0x01},
@@ -623,7 +623,7 @@ static int build_locking_range(u8 *buffer, size_t length, u8 lr)
 static int build_locking_user(u8 *buffer, size_t length, u8 lr)
 {
 	if (length > OPAL_UID_LENGTH) {
-		pr_debug("Can't build locking range user, Length OOB\n");
+		pr_debug("Can't build locking range user. Length OOB\n");
 		return -ERANGE;
 	}
 
@@ -1324,6 +1324,7 @@ static int start_SIDASP_opal_session(struct opal_dev *dev, void *data)
 
 	if (!key) {
 		const struct opal_key *okey = data;
+
 		ret = start_generic_opal_session(dev, OPAL_SID_UID,
 						 OPAL_ADMINSP_UID,
 						 okey->key,
@@ -1341,6 +1342,7 @@ static int start_SIDASP_opal_session(struct opal_dev *dev, void *data)
 static int start_admin1LSP_opal_session(struct opal_dev *dev, void *data)
 {
 	struct opal_key *key = data;
+
 	return start_generic_opal_session(dev, OPAL_ADMIN1_UID,
 					  OPAL_LOCKINGSP_UID,
 					  key->key, key->key_len);
@@ -1714,7 +1716,7 @@ static int lock_unlock_locking_range(struct opal_dev *dev, void *data)
 		write_locked = 0;
 		break;
 	case OPAL_LK:
-		/* vars are initalized to locked */
+		/* vars are initialized to locked */
 		break;
 	default:
 		pr_debug("Tried to set an invalid locking state... returning to uland\n");
@@ -1775,7 +1777,7 @@ static int lock_unlock_locking_range_sum(struct opal_dev *dev, void *data)
 		write_locked = 0;
 		break;
 	case OPAL_LK:
-		/* vars are initalized to locked */
+		/* vars are initialized to locked */
 		break;
 	default:
 		pr_debug("Tried to set an invalid locking state.\n");
@@ -2222,7 +2224,7 @@ static int __opal_lock_unlock(struct opal_dev *dev,
 static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
 {
 	u8 mbr_done_tf = 1;
-	const struct opal_step mbrdone_step [] = {
+	const struct opal_step mbrdone_step[] = {
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, key },
 		{ set_mbr_done, &mbr_done_tf },
@@ -2273,7 +2275,8 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 	return ret;
 }
 
-static int opal_activate_lsp(struct opal_dev *dev, struct opal_lr_act *opal_lr_act)
+static int opal_activate_lsp(struct opal_dev *dev,
+			     struct opal_lr_act *opal_lr_act)
 {
 	const struct opal_step active_steps[] = {
 		{ opal_discovery0, },
-- 
2.20.1

Re: [PATCH v3 01/16] block: sed-opal: fix typos and formatting

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:32PM +0100, David Kozub wrote:
> This should make no change in functionality.
> The formatting changes were triggered by checkpatch.pl.
> 
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 02/16] block: sed-opal: use correct macro for method length

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

Also the values of OPAL_UID_LENGTH and OPAL_METHOD_LENGTH are the same,
it is weird to use OPAL_UID_LENGTH for the definition of the methods.

Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index c882a193e162..5c123a5b4ab1 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -181,7 +181,7 @@ static const u8 opaluid[][OPAL_UID_LENGTH] = {
  * Derived from: TCG_Storage_Architecture_Core_Spec_v2.01_r1.00
  * Section: 6.3 Assigned UIDs
  */
-static const u8 opalmethod[][OPAL_UID_LENGTH] = {
+static const u8 opalmethod[][OPAL_METHOD_LENGTH] = {
 	[OPAL_PROPERTIES] =
 		{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x01 },
 	[OPAL_STARTSESSION] =
-- 
2.20.1

Re: [PATCH v3 02/16] block: sed-opal: use correct macro for method length

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:33PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> Also the values of OPAL_UID_LENGTH and OPAL_METHOD_LENGTH are the same,
> it is weird to use OPAL_UID_LENGTH for the definition of the methods.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 03/16] block: sed-opal: unify space check in add_token_*

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

All add_token_* functions have a common set of conditions that have to
be checked. Use a common function for those checks in order to avoid
different behaviour as well as code duplication.

Co-authored-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
---
 block/sed-opal.c | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 5c123a5b4ab1..980705681806 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -510,15 +510,29 @@ static int opal_discovery0(struct opal_dev *dev, void *data)
 	return opal_discovery0_end(dev);
 }
 
-static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
+static size_t remaining_size(struct opal_dev *cmd)
+{
+	return IO_BUFFER_LENGTH - cmd->pos;
+}
+
+static bool can_add(int *err, struct opal_dev *cmd, size_t len)
 {
 	if (*err)
-		return;
-	if (cmd->pos >= IO_BUFFER_LENGTH - 1) {
-		pr_debug("Error adding u8: end of buffer.\n");
+		return false;
+
+	if (remaining_size(cmd) < len) {
+		pr_debug("Error adding %zu bytes: end of buffer.\n", len);
 		*err = -ERANGE;
-		return;
+		return false;
 	}
+
+	return true;
+}
+
+static void add_token_u8(int *err, struct opal_dev *cmd, u8 tok)
+{
+	if (!can_add(err, cmd, 1))
+		return;
 	cmd->cmd[cmd->pos++] = tok;
 }
 
@@ -563,9 +577,8 @@ static void add_token_u64(int *err, struct opal_dev *cmd, u64 number)
 	msb = fls64(number);
 	len = DIV_ROUND_UP(msb, 8);
 
-	if (cmd->pos >= IO_BUFFER_LENGTH - len - 1) {
+	if (!can_add(err, cmd, len + 1)) {
 		pr_debug("Error adding u64: end of buffer.\n");
-		*err = -ERANGE;
 		return;
 	}
 	add_short_atom_header(cmd, false, false, len);
@@ -587,9 +600,8 @@ static void add_token_bytestring(int *err, struct opal_dev *cmd,
 		is_short_atom = false;
 	}
 
-	if (len >= IO_BUFFER_LENGTH - cmd->pos - header_len) {
+	if (!can_add(err, cmd, header_len + len)) {
 		pr_debug("Error adding bytestring: end of buffer.\n");
-		*err = -ERANGE;
 		return;
 	}
 
-- 
2.20.1

Re: [PATCH v3 03/16] block: sed-opal: unify space check in add_token_*

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:34PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> All add_token_* functions have a common set of conditions that have to
> be checked. Use a common function for those checks in order to avoid
> different behaviour as well as code duplication.
> 
> Co-authored-by: David Kozub <zub@linux.fjfi.cvut.cz>
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 04/16] block: sed-opal: close parameter list in cmd_finalize

[David Kozub]

Every step ends by calling cmd_finalize (via finalize_and_send)
yet every step adds the token OPAL_ENDLIST on its own. Moving
this into cmd_finalize decreases code duplication.

Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 980705681806..35b1747b650f 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -661,6 +661,9 @@ static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn)
 	struct opal_header *hdr;
 	int err = 0;
 
+	/* close parameter list */
+	add_token_u8(&err, cmd, OPAL_ENDLIST);
+
 	add_token_u8(&err, cmd, OPAL_ENDOFDATA);
 	add_token_u8(&err, cmd, OPAL_STARTLIST);
 	add_token_u8(&err, cmd, 0);
@@ -1079,7 +1082,6 @@ static int gen_key(struct opal_dev *dev, void *data)
 	add_token_bytestring(&err, dev, opalmethod[OPAL_GENKEY],
 			     OPAL_UID_LENGTH);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error building gen key command\n");
@@ -1142,7 +1144,6 @@ static int get_active_key(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, 10); /* ActiveKey */
 	add_token_u8(&err, dev, OPAL_ENDNAME);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 	if (err) {
 		pr_debug("Error building get active key command\n");
 		return err;
@@ -1188,7 +1189,6 @@ static int generic_lr_enable_disable(struct opal_dev *dev,
 
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 	return err;
 }
 
@@ -1254,8 +1254,6 @@ static int setup_locking_range(struct opal_dev *dev, void *data)
 
 		add_token_u8(&err, dev, OPAL_ENDLIST);
 		add_token_u8(&err, dev, OPAL_ENDNAME);
-		add_token_u8(&err, dev, OPAL_ENDLIST);
-
 	}
 	if (err) {
 		pr_debug("Error building Setup Locking range command.\n");
@@ -1295,7 +1293,6 @@ static int start_generic_opal_session(struct opal_dev *dev,
 
 	switch (auth) {
 	case OPAL_ANYBODY_UID:
-		add_token_u8(&err, dev, OPAL_ENDLIST);
 		break;
 	case OPAL_ADMIN1_UID:
 	case OPAL_SID_UID:
@@ -1308,7 +1305,6 @@ static int start_generic_opal_session(struct opal_dev *dev,
 		add_token_bytestring(&err, dev, opaluid[auth],
 				     OPAL_UID_LENGTH);
 		add_token_u8(&err, dev, OPAL_ENDNAME);
-		add_token_u8(&err, dev, OPAL_ENDLIST);
 		break;
 	default:
 		pr_debug("Cannot start Admin SP session with auth %d\n", auth);
@@ -1406,7 +1402,6 @@ static int start_auth_opal_session(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, 3);
 	add_token_bytestring(&err, dev, lk_ul_user, OPAL_UID_LENGTH);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error building STARTSESSION command.\n");
@@ -1429,7 +1424,6 @@ static int revert_tper(struct opal_dev *dev, void *data)
 	add_token_bytestring(&err, dev, opalmethod[OPAL_REVERT],
 			     OPAL_UID_LENGTH);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 	if (err) {
 		pr_debug("Error building REVERT TPER command.\n");
 		return err;
@@ -1463,7 +1457,6 @@ static int internal_activate_user(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, OPAL_ENDNAME);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error building Activate UserN command.\n");
@@ -1490,7 +1483,6 @@ static int erase_locking_range(struct opal_dev *dev, void *data)
 	add_token_bytestring(&err, dev, opalmethod[OPAL_ERASE],
 			     OPAL_UID_LENGTH);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error building Erase Locking Range Command.\n");
@@ -1521,7 +1513,6 @@ static int set_mbr_done(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, OPAL_ENDNAME);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error Building set MBR Done command\n");
@@ -1553,7 +1544,6 @@ static int set_mbr_enable_disable(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, OPAL_ENDNAME);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error Building set MBR done command\n");
@@ -1585,7 +1575,6 @@ static int generic_pw_cmd(u8 *key, size_t key_len, u8 *cpin_uid,
 	add_token_u8(&err, dev, OPAL_ENDNAME);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	return err;
 }
@@ -1694,7 +1683,6 @@ static int add_user_to_lr(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, OPAL_ENDNAME);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error building add user to locking range command.\n");
@@ -1755,7 +1743,6 @@ static int lock_unlock_locking_range(struct opal_dev *dev, void *data)
 
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
 		pr_debug("Error building SET command.\n");
@@ -1843,11 +1830,8 @@ static int activate_lsp(struct opal_dev *dev, void *data)
 		}
 		add_token_u8(&err, dev, OPAL_ENDLIST);
 		add_token_u8(&err, dev, OPAL_ENDNAME);
-		add_token_u8(&err, dev, OPAL_ENDLIST);
-
 	} else {
 		add_token_u8(&err, dev, OPAL_STARTLIST);
-		add_token_u8(&err, dev, OPAL_ENDLIST);
 	}
 
 	if (err) {
@@ -1904,7 +1888,6 @@ static int get_lsp_lifecycle(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, 6); /* Lifecycle Column */
 	add_token_u8(&err, dev, OPAL_ENDNAME);
 
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
@@ -1964,8 +1947,6 @@ static int get_msid_cpin_pin(struct opal_dev *dev, void *data)
 	add_token_u8(&err, dev, 4); /* End Column */
 	add_token_u8(&err, dev, 3); /* Lifecycle Column */
 	add_token_u8(&err, dev, OPAL_ENDNAME);
-
-	add_token_u8(&err, dev, OPAL_ENDLIST);
 	add_token_u8(&err, dev, OPAL_ENDLIST);
 
 	if (err) {
-- 
2.20.1

Re: [PATCH v3 04/16] block: sed-opal: close parameter list in cmd_finalize

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:35PM +0100, David Kozub wrote:
> Every step ends by calling cmd_finalize (via finalize_and_send)
> yet every step adds the token OPAL_ENDLIST on its own. Moving
> this into cmd_finalize decreases code duplication.
> 
> Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 05/16] block: sed-opal: unify cmd start

[David Kozub]

Every step starts with resetting the cmd buffer as well as the comid and
constructs the appropriate OPAL_CALL command. Consequently, those
actions may be combined into one generic function. On should take care
that the opening and closing tokens for the argument list are already
emitted by cmd_start and cmd_finalize respectively and thus must not be
additionally added.

Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c | 228 ++++++++++++++---------------------------------
 1 file changed, 69 insertions(+), 159 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 35b1747b650f..e29cb2f445ff 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -661,7 +661,7 @@ static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn)
 	struct opal_header *hdr;
 	int err = 0;
 
-	/* close parameter list */
+	/* close the parameter list opened from cmd_start */
 	add_token_u8(&err, cmd, OPAL_ENDLIST);
 
 	add_token_u8(&err, cmd, OPAL_ENDOFDATA);
@@ -1006,6 +1006,27 @@ static void clear_opal_cmd(struct opal_dev *dev)
 	memset(dev->cmd, 0, IO_BUFFER_LENGTH);
 }
 
+static int cmd_start(struct opal_dev *dev, const u8 *uid, const u8 *method)
+{
+	int err = 0;
+
+	clear_opal_cmd(dev);
+	set_comid(dev, dev->comid);
+
+	add_token_u8(&err, dev, OPAL_CALL);
+	add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
+	add_token_bytestring(&err, dev, method, OPAL_METHOD_LENGTH);
+
+	/*
+	 * Every method call is followed by its parameters enclosed within
+	 * OPAL_STARTLIST and OPAL_ENDLIST tokens. We automatically open the
+	 * parameter list here and close it later in cmd_finalize.
+	 */
+	add_token_u8(&err, dev, OPAL_STARTLIST);
+
+	return err;
+}
+
 static int start_opal_session_cont(struct opal_dev *dev)
 {
 	u32 hsn, tsn;
@@ -1068,20 +1089,13 @@ static int finalize_and_send(struct opal_dev *dev, cont_fn cont)
 static int gen_key(struct opal_dev *dev, void *data)
 {
 	u8 uid[OPAL_UID_LENGTH];
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
 	memcpy(uid, dev->prev_data, min(sizeof(uid), dev->prev_d_len));
 	kfree(dev->prev_data);
 	dev->prev_data = NULL;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_GENKEY],
-			     OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
+	err = cmd_start(dev, uid, opalmethod[OPAL_GENKEY]);
 
 	if (err) {
 		pr_debug("Error building gen key command\n");
@@ -1119,21 +1133,14 @@ static int get_active_key_cont(struct opal_dev *dev)
 static int get_active_key(struct opal_dev *dev, void *data)
 {
 	u8 uid[OPAL_UID_LENGTH];
-	int err = 0;
+	int err;
 	u8 *lr = data;
 
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
-
 	err = build_locking_range(uid, sizeof(uid), *lr);
 	if (err)
 		return err;
 
-	err = 0;
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_GET], OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
+	err = cmd_start(dev, uid, opalmethod[OPAL_GET]);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, 3); /* startCloumn */
@@ -1156,13 +1163,10 @@ static int generic_lr_enable_disable(struct opal_dev *dev,
 				     u8 *uid, bool rle, bool wle,
 				     bool rl, bool wl)
 {
-	int err = 0;
+	int err;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_SET], OPAL_UID_LENGTH);
+	err = cmd_start(dev, uid, opalmethod[OPAL_SET]);
 
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, OPAL_VALUES);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
@@ -1209,10 +1213,7 @@ static int setup_locking_range(struct opal_dev *dev, void *data)
 	u8 uid[OPAL_UID_LENGTH];
 	struct opal_user_lr_setup *setup = data;
 	u8 lr;
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
 	lr = setup->session.opal_key.lr;
 	err = build_locking_range(uid, sizeof(uid), lr);
@@ -1222,12 +1223,8 @@ static int setup_locking_range(struct opal_dev *dev, void *data)
 	if (lr == 0)
 		err = enable_global_lr(dev, uid, setup);
 	else {
-		add_token_u8(&err, dev, OPAL_CALL);
-		add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
-		add_token_bytestring(&err, dev, opalmethod[OPAL_SET],
-				     OPAL_UID_LENGTH);
+		err = cmd_start(dev, uid, opalmethod[OPAL_SET]);
 
-		add_token_u8(&err, dev, OPAL_STARTLIST);
 		add_token_u8(&err, dev, OPAL_STARTNAME);
 		add_token_u8(&err, dev, OPAL_VALUES);
 		add_token_u8(&err, dev, OPAL_STARTLIST);
@@ -1271,22 +1268,15 @@ static int start_generic_opal_session(struct opal_dev *dev,
 				      u8 key_len)
 {
 	u32 hsn;
-	int err = 0;
+	int err;
 
 	if (key == NULL && auth != OPAL_ANYBODY_UID)
 		return OPAL_INVAL_PARAM;
 
-	clear_opal_cmd(dev);
-
-	set_comid(dev, dev->comid);
 	hsn = GENERIC_HOST_SESSION_NUM;
+	err = cmd_start(dev, opaluid[OPAL_SMUID_UID],
+			opalmethod[OPAL_STARTSESSION]);
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_SMUID_UID],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_STARTSESSION],
-			     OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u64(&err, dev, hsn);
 	add_token_bytestring(&err, dev, opaluid[sp_type], OPAL_UID_LENGTH);
 	add_token_u8(&err, dev, 1);
@@ -1366,30 +1356,21 @@ static int start_auth_opal_session(struct opal_dev *dev, void *data)
 	u8 *key = session->opal_key.key;
 	u32 hsn = GENERIC_HOST_SESSION_NUM;
 
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
-
-	if (session->sum) {
+	if (session->sum)
 		err = build_locking_user(lk_ul_user, sizeof(lk_ul_user),
 					 session->opal_key.lr);
-		if (err)
-			return err;
-
-	} else if (session->who != OPAL_ADMIN1 && !session->sum) {
+	else if (session->who != OPAL_ADMIN1 && !session->sum)
 		err = build_locking_user(lk_ul_user, sizeof(lk_ul_user),
 					 session->who - 1);
-		if (err)
-			return err;
-	} else
+	else
 		memcpy(lk_ul_user, opaluid[OPAL_ADMIN1_UID], OPAL_UID_LENGTH);
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_SMUID_UID],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_STARTSESSION],
-			     OPAL_UID_LENGTH);
+	if (err)
+		return err;
+
+	err = cmd_start(dev, opaluid[OPAL_SMUID_UID],
+			opalmethod[OPAL_STARTSESSION]);
 
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u64(&err, dev, hsn);
 	add_token_bytestring(&err, dev, opaluid[OPAL_LOCKINGSP_UID],
 			     OPAL_UID_LENGTH);
@@ -1413,17 +1394,10 @@ static int start_auth_opal_session(struct opal_dev *dev, void *data)
 
 static int revert_tper(struct opal_dev *dev, void *data)
 {
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_ADMINSP_UID],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_REVERT],
-			     OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
+	err = cmd_start(dev, opaluid[OPAL_ADMINSP_UID],
+			opalmethod[OPAL_REVERT]);
 	if (err) {
 		pr_debug("Error building REVERT TPER command.\n");
 		return err;
@@ -1436,18 +1410,12 @@ static int internal_activate_user(struct opal_dev *dev, void *data)
 {
 	struct opal_session_info *session = data;
 	u8 uid[OPAL_UID_LENGTH];
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
 	memcpy(uid, opaluid[OPAL_USER1_UID], OPAL_UID_LENGTH);
 	uid[7] = session->who;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_SET], OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
+	err = cmd_start(dev, uid, opalmethod[OPAL_SET]);
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, OPAL_VALUES);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
@@ -1470,19 +1438,12 @@ static int erase_locking_range(struct opal_dev *dev, void *data)
 {
 	struct opal_session_info *session = data;
 	u8 uid[OPAL_UID_LENGTH];
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
 	if (build_locking_range(uid, sizeof(uid), session->opal_key.lr) < 0)
 		return -ERANGE;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, uid, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_ERASE],
-			     OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
+	err = cmd_start(dev, uid, opalmethod[OPAL_ERASE]);
 
 	if (err) {
 		pr_debug("Error building Erase Locking Range Command.\n");
@@ -1494,16 +1455,11 @@ static int erase_locking_range(struct opal_dev *dev, void *data)
 static int set_mbr_done(struct opal_dev *dev, void *data)
 {
 	u8 *mbr_done_tf = data;
-	int err = 0;
+	int err;
 
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	err = cmd_start(dev, opaluid[OPAL_MBRCONTROL],
+			opalmethod[OPAL_SET]);
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_MBRCONTROL],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_SET], OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, OPAL_VALUES);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
@@ -1525,16 +1481,11 @@ static int set_mbr_done(struct opal_dev *dev, void *data)
 static int set_mbr_enable_disable(struct opal_dev *dev, void *data)
 {
 	u8 *mbr_en_dis = data;
-	int err = 0;
+	int err;
 
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	err = cmd_start(dev, opaluid[OPAL_MBRCONTROL],
+			opalmethod[OPAL_SET]);
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_MBRCONTROL],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_SET], OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, OPAL_VALUES);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
@@ -1556,16 +1507,10 @@ static int set_mbr_enable_disable(struct opal_dev *dev, void *data)
 static int generic_pw_cmd(u8 *key, size_t key_len, u8 *cpin_uid,
 			  struct opal_dev *dev)
 {
-	int err = 0;
+	int err;
 
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	err = cmd_start(dev, cpin_uid, opalmethod[OPAL_SET]);
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, cpin_uid, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_SET],
-			     OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, OPAL_VALUES);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
@@ -1622,10 +1567,7 @@ static int add_user_to_lr(struct opal_dev *dev, void *data)
 	u8 lr_buffer[OPAL_UID_LENGTH];
 	u8 user_uid[OPAL_UID_LENGTH];
 	struct opal_lock_unlock *lkul = data;
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
 	memcpy(lr_buffer, opaluid[OPAL_LOCKINGRANGE_ACE_RDLOCKED],
 	       OPAL_UID_LENGTH);
@@ -1640,12 +1582,8 @@ static int add_user_to_lr(struct opal_dev *dev, void *data)
 
 	user_uid[7] = lkul->session.who;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, lr_buffer, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_SET],
-			     OPAL_UID_LENGTH);
+	err = cmd_start(dev, lr_buffer, opalmethod[OPAL_SET]);
 
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, OPAL_VALUES);
 
@@ -1699,9 +1637,6 @@ static int lock_unlock_locking_range(struct opal_dev *dev, void *data)
 	u8 read_locked = 1, write_locked = 1;
 	int err = 0;
 
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
-
 	if (build_locking_range(lr_buffer, sizeof(lr_buffer),
 				lkul->session.opal_key.lr) < 0)
 		return -ERANGE;
@@ -1723,10 +1658,8 @@ static int lock_unlock_locking_range(struct opal_dev *dev, void *data)
 		return OPAL_INVAL_PARAM;
 	}
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, lr_buffer, OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_SET], OPAL_UID_LENGTH);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
+	err = cmd_start(dev, lr_buffer, opalmethod[OPAL_SET]);
+
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, OPAL_VALUES);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
@@ -1797,17 +1730,10 @@ static int activate_lsp(struct opal_dev *dev, void *data)
 	struct opal_lr_act *opal_act = data;
 	u8 user_lr[OPAL_UID_LENGTH];
 	u8 uint_3 = 0x83;
-	int err = 0, i;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
-
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_LOCKINGSP_UID],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_ACTIVATE],
-			     OPAL_UID_LENGTH);
+	int err, i;
 
+	err = cmd_start(dev, opaluid[OPAL_LOCKINGSP_UID],
+			opalmethod[OPAL_ACTIVATE]);
 
 	if (opal_act->sum) {
 		err = build_locking_range(user_lr, sizeof(user_lr),
@@ -1815,7 +1741,6 @@ static int activate_lsp(struct opal_dev *dev, void *data)
 		if (err)
 			return err;
 
-		add_token_u8(&err, dev, OPAL_STARTLIST);
 		add_token_u8(&err, dev, OPAL_STARTNAME);
 		add_token_u8(&err, dev, uint_3);
 		add_token_u8(&err, dev, 6);
@@ -1830,8 +1755,6 @@ static int activate_lsp(struct opal_dev *dev, void *data)
 		}
 		add_token_u8(&err, dev, OPAL_ENDLIST);
 		add_token_u8(&err, dev, OPAL_ENDNAME);
-	} else {
-		add_token_u8(&err, dev, OPAL_STARTLIST);
 	}
 
 	if (err) {
@@ -1865,17 +1788,11 @@ static int get_lsp_lifecycle_cont(struct opal_dev *dev)
 /* Determine if we're in the Manufactured Inactive or Active state */
 static int get_lsp_lifecycle(struct opal_dev *dev, void *data)
 {
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_LOCKINGSP_UID],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_GET], OPAL_UID_LENGTH);
+	err = cmd_start(dev, opaluid[OPAL_LOCKINGSP_UID],
+			opalmethod[OPAL_GET]);
 
-	add_token_u8(&err, dev, OPAL_STARTLIST);
 	add_token_u8(&err, dev, OPAL_STARTLIST);
 
 	add_token_u8(&err, dev, OPAL_STARTNAME);
@@ -1925,19 +1842,12 @@ static int get_msid_cpin_pin_cont(struct opal_dev *dev)
 
 static int get_msid_cpin_pin(struct opal_dev *dev, void *data)
 {
-	int err = 0;
-
-	clear_opal_cmd(dev);
-	set_comid(dev, dev->comid);
+	int err;
 
-	add_token_u8(&err, dev, OPAL_CALL);
-	add_token_bytestring(&err, dev, opaluid[OPAL_C_PIN_MSID],
-			     OPAL_UID_LENGTH);
-	add_token_bytestring(&err, dev, opalmethod[OPAL_GET], OPAL_UID_LENGTH);
+	err = cmd_start(dev, opaluid[OPAL_C_PIN_MSID],
+			opalmethod[OPAL_GET]);
 
 	add_token_u8(&err, dev, OPAL_STARTLIST);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
-
 	add_token_u8(&err, dev, OPAL_STARTNAME);
 	add_token_u8(&err, dev, 3); /* Start Column */
 	add_token_u8(&err, dev, 3); /* PIN */
-- 
2.20.1

Re: [PATCH v3 05/16] block: sed-opal: unify cmd start

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:36PM +0100, David Kozub wrote:
> Every step starts with resetting the cmd buffer as well as the comid and
> constructs the appropriate OPAL_CALL command. Consequently, those
> actions may be combined into one generic function. On should take care
> that the opening and closing tokens for the argument list are already
> emitted by cmd_start and cmd_finalize respectively and thus must not be
> additionally added.
> 
> Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 06/16] block: sed-opal: unify error handling of responses

[David Kozub]

response_get_{string,u64} include error handling for argument resp being
NULL but response_get_token does not handle this.

Make all three of response_get_{string,u64,token} handle NULL resp in
the same way.

Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index e29cb2f445ff..537cd73ea88a 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -702,6 +702,11 @@ static const struct opal_resp_tok *response_get_token(
 {
 	const struct opal_resp_tok *tok;
 
+	if (!resp) {
+		pr_debug("Response is NULL\n");
+		return ERR_PTR(-EINVAL);
+	}
+
 	if (n >= resp->num) {
 		pr_debug("Token number doesn't exist: %d, resp: %d\n",
 			 n, resp->num);
-- 
2.20.1

Re: [PATCH v3 06/16] block: sed-opal: unify error handling of responses

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:37PM +0100, David Kozub wrote:
> response_get_{string,u64} include error handling for argument resp being
> NULL but response_get_token does not handle this.
> 
> Make all three of response_get_{string,u64,token} handle NULL resp in
> the same way.
> 
> Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 07/16] block: sed-opal: reuse response_get_token to decrease code duplication

[David Kozub]

response_get_token had already been in place, its functionality had
been duplicated within response_get_{u64,bytestring} with the same error
handling. Unify the handling by reusing response_get_token within the
other functions.

Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c | 46 +++++++++++++++-------------------------------
 1 file changed, 15 insertions(+), 31 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 537cd73ea88a..1332547e5a99 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -889,27 +889,19 @@ static size_t response_get_string(const struct parsed_resp *resp, int n,
 				  const char **store)
 {
 	u8 skip;
-	const struct opal_resp_tok *token;
+	const struct opal_resp_tok *tok;
 
 	*store = NULL;
-	if (!resp) {
-		pr_debug("Response is NULL\n");
-		return 0;
-	}
-
-	if (n >= resp->num) {
-		pr_debug("Response has %d tokens. Can't access %d\n",
-			 resp->num, n);
+	tok = response_get_token(resp, n);
+	if (IS_ERR(tok))
 		return 0;
-	}
 
-	token = &resp->toks[n];
-	if (token->type != OPAL_DTA_TOKENID_BYTESTRING) {
+	if (tok->type != OPAL_DTA_TOKENID_BYTESTRING) {
 		pr_debug("Token is not a byte string!\n");
 		return 0;
 	}
 
-	switch (token->width) {
+	switch (tok->width) {
 	case OPAL_WIDTH_TINY:
 	case OPAL_WIDTH_SHORT:
 		skip = 1;
@@ -925,37 +917,29 @@ static size_t response_get_string(const struct parsed_resp *resp, int n,
 		return 0;
 	}
 
-	*store = token->pos + skip;
-	return token->len - skip;
+	*store = tok->pos + skip;
+	return tok->len - skip;
 }
 
 static u64 response_get_u64(const struct parsed_resp *resp, int n)
 {
-	if (!resp) {
-		pr_debug("Response is NULL\n");
-		return 0;
-	}
+	const struct opal_resp_tok *tok;
 
-	if (n >= resp->num) {
-		pr_debug("Response has %d tokens. Can't access %d\n",
-			 resp->num, n);
+	tok = response_get_token(resp, n);
+	if (IS_ERR(tok))
 		return 0;
-	}
 
-	if (resp->toks[n].type != OPAL_DTA_TOKENID_UINT) {
-		pr_debug("Token is not unsigned it: %d\n",
-			 resp->toks[n].type);
+	if (tok->type != OPAL_DTA_TOKENID_UINT) {
+		pr_debug("Token is not unsigned int: %d\n", tok->type);
 		return 0;
 	}
 
-	if (!(resp->toks[n].width == OPAL_WIDTH_TINY ||
-	      resp->toks[n].width == OPAL_WIDTH_SHORT)) {
-		pr_debug("Atom is not short or tiny: %d\n",
-			 resp->toks[n].width);
+	if (tok->width != OPAL_WIDTH_TINY && tok->width != OPAL_WIDTH_SHORT) {
+		pr_debug("Atom is not short or tiny: %d\n", tok->width);
 		return 0;
 	}
 
-	return resp->toks[n].stored.u;
+	return tok->stored.u;
 }
 
 static bool response_token_matches(const struct opal_resp_tok *token, u8 match)
-- 
2.20.1

Re: [PATCH v3 07/16] block: sed-opal: reuse response_get_token to decrease code duplication

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:38PM +0100, David Kozub wrote:
> response_get_token had already been in place, its functionality had
> been duplicated within response_get_{u64,bytestring} with the same error
> handling. Unify the handling by reusing response_get_token within the
> other functions.
> 
> Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 08/16] block: sed-opal: print failed function address

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

Add function address (and if available its symbol) to the message if a
step function fails.

Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 1332547e5a99..4225f23b2165 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -394,8 +394,8 @@ static int next(struct opal_dev *dev)
 
 		error = step->fn(dev, step->data);
 		if (error) {
-			pr_debug("Error on step function: %d with error %d: %s\n",
-				 state, error,
+			pr_debug("Step %d (%pS) failed wit error %d: %s\n",
+				 state, step->fn, error,
 				 opal_error_to_human(error));
 
 			/* For each OPAL command we do a discovery0 then we
-- 
2.20.1

Re: [PATCH v3 08/16] block: sed-opal: print failed function address

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:39PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> Add function address (and if available its symbol) to the message if a
> step function fails.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 09/16] block: sed-opal: split generation of bytestring header and content

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

Split the header generation from the (normal) memcpy part if a
bytestring is copied into the command buffer. This allows in-place
generation of the bytestring content. For example, copy_from_user may be
used without an intermediate buffer.

Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 4225f23b2165..4b0a63b9d7c9 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -586,14 +586,11 @@ static void add_token_u64(int *err, struct opal_dev *cmd, u64 number)
 		add_token_u8(err, cmd, number >> (len * 8));
 }
 
-static void add_token_bytestring(int *err, struct opal_dev *cmd,
-				 const u8 *bytestring, size_t len)
+static u8 *add_bytestring_header(int *err, struct opal_dev *cmd, size_t len)
 {
 	size_t header_len = 1;
 	bool is_short_atom = true;
-
-	if (*err)
-		return;
+	char *start;
 
 	if (len & ~SHORT_ATOM_LEN_MASK) {
 		header_len = 2;
@@ -602,17 +599,27 @@ static void add_token_bytestring(int *err, struct opal_dev *cmd,
 
 	if (!can_add(err, cmd, header_len + len)) {
 		pr_debug("Error adding bytestring: end of buffer.\n");
-		return;
+		return NULL;
 	}
 
 	if (is_short_atom)
 		add_short_atom_header(cmd, true, false, len);
 	else
 		add_medium_atom_header(cmd, true, false, len);
+	start = &cmd->cmd[cmd->pos];
+	return start;
+}
 
-	memcpy(&cmd->cmd[cmd->pos], bytestring, len);
-	cmd->pos += len;
+static void add_token_bytestring(int *err, struct opal_dev *cmd,
+				 const u8 *bytestring, size_t len)
+{
+	u8 *start;
 
+	start = add_bytestring_header(err, cmd, len);
+	if (!start)
+		return;
+	memcpy(start, bytestring, len);
+	cmd->pos += len;
 }
 
 static int build_locking_range(u8 *buffer, size_t length, u8 lr)
-- 
2.20.1

Re: [PATCH v3 09/16] block: sed-opal: split generation of bytestring header and content

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:40PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> Split the header generation from the (normal) memcpy part if a
> bytestring is copied into the command buffer. This allows in-place
> generation of the bytestring content. For example, copy_from_user may be
> used without an intermediate buffer.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 10/16] block: sed-opal: add ioctl for done-mark of shadow mbr

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

Enable users to mark the shadow mbr as done without completely
deactivating the shadow mbr feature. This may be useful on reboots,
when the power to the disk is not disconnected in between and the shadow
mbr stores the required boot files. Of course, this saves also the
(few) commands required to enable the feature if it is already enabled
and one only wants to mark the shadow mbr as done.

Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/sed-opal.c              | 33 +++++++++++++++++++++++++++++++--
 include/linux/sed-opal.h      |  1 +
 include/uapi/linux/sed-opal.h |  1 +
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 4b0a63b9d7c9..e03838cfd31b 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -1996,13 +1996,39 @@ static int opal_erase_locking_range(struct opal_dev *dev,
 static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 					  struct opal_mbr_data *opal_mbr)
 {
+	u8 token = opal_mbr->enable_disable == OPAL_MBR_ENABLE
+		? OPAL_TRUE : OPAL_FALSE;
 	const struct opal_step mbr_steps[] = {
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
-		{ set_mbr_done, &opal_mbr->enable_disable },
+		{ set_mbr_done, &token },
 		{ end_opal_session, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
-		{ set_mbr_enable_disable, &opal_mbr->enable_disable },
+		{ set_mbr_enable_disable, &token },
+		{ end_opal_session, },
+		{ NULL, }
+	};
+	int ret;
+
+	if (opal_mbr->enable_disable != OPAL_MBR_ENABLE &&
+	    opal_mbr->enable_disable != OPAL_MBR_DISABLE)
+		return -EINVAL;
+
+	mutex_lock(&dev->dev_lock);
+	setup_opal_dev(dev, mbr_steps);
+	ret = next(dev);
+	mutex_unlock(&dev->dev_lock);
+	return ret;
+}
+
+static int opal_mbr_status(struct opal_dev *dev, struct opal_mbr_data *opal_mbr)
+{
+	u8 token = opal_mbr->enable_disable == OPAL_MBR_ENABLE
+		? OPAL_TRUE : OPAL_FALSE;
+	const struct opal_step mbr_steps[] = {
+		{ opal_discovery0, },
+		{ start_admin1LSP_opal_session, &opal_mbr->key },
+		{ set_mbr_done, &token },
 		{ end_opal_session, },
 		{ NULL, }
 	};
@@ -2349,6 +2375,9 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg)
 	case IOC_OPAL_ENABLE_DISABLE_MBR:
 		ret = opal_enable_disable_shadow_mbr(dev, p);
 		break;
+	case IOC_OPAL_MBR_STATUS:
+		ret = opal_mbr_status(dev, p);
+		break;
 	case IOC_OPAL_ERASE_LR:
 		ret = opal_erase_locking_range(dev, p);
 		break;
diff --git a/include/linux/sed-opal.h b/include/linux/sed-opal.h
index 04b124fca51e..b38dc602cae3 100644
--- a/include/linux/sed-opal.h
+++ b/include/linux/sed-opal.h
@@ -47,6 +47,7 @@ static inline bool is_sed_ioctl(unsigned int cmd)
 	case IOC_OPAL_ENABLE_DISABLE_MBR:
 	case IOC_OPAL_ERASE_LR:
 	case IOC_OPAL_SECURE_ERASE_LR:
+	case IOC_OPAL_MBR_STATUS:
 		return true;
 	}
 	return false;
diff --git a/include/uapi/linux/sed-opal.h b/include/uapi/linux/sed-opal.h
index 627624d35030..0cb9890cdc04 100644
--- a/include/uapi/linux/sed-opal.h
+++ b/include/uapi/linux/sed-opal.h
@@ -116,5 +116,6 @@ struct opal_mbr_data {
 #define IOC_OPAL_ENABLE_DISABLE_MBR _IOW('p', 229, struct opal_mbr_data)
 #define IOC_OPAL_ERASE_LR           _IOW('p', 230, struct opal_session_info)
 #define IOC_OPAL_SECURE_ERASE_LR    _IOW('p', 231, struct opal_session_info)
+#define IOC_OPAL_MBR_STATUS         _IOW('p', 232, struct opal_mbr_data)
 
 #endif /* _UAPI_SED_OPAL_H */
-- 
2.20.1

Re: [PATCH v3 10/16] block: sed-opal: add ioctl for done-mark of shadow mbr

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:41PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> Enable users to mark the shadow mbr as done without completely
> deactivating the shadow mbr feature. This may be useful on reboots,
> when the power to the disk is not disconnected in between and the shadow
> mbr stores the required boot files. Of course, this saves also the
> (few) commands required to enable the feature if it is already enabled
> and one only wants to mark the shadow mbr as done.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 11/16] block: sed-opal: ioctl for writing to shadow mbr

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

Allow modification of the shadow mbr. If the shadow mbr is not marked as
done, this data will be presented read only as the device content. Only
after marking the shadow mbr as done and unlocking a locking range the
actual content is accessible.

Co-authored-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
---
 block/sed-opal.c              | 89 ++++++++++++++++++++++++++++++++++-
 include/linux/sed-opal.h      |  1 +
 include/uapi/linux/sed-opal.h |  8 ++++
 3 files changed, 97 insertions(+), 1 deletion(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index e03838cfd31b..88c84906ce98 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -34,6 +34,9 @@
 #define IO_BUFFER_LENGTH 2048
 #define MAX_TOKS 64
 
+/* Number of bytes needed by cmd_finalize. */
+#define CMD_FINALIZE_BYTES_NEEDED 7
+
 struct opal_step {
 	int (*fn)(struct opal_dev *dev, void *data);
 	void *data;
@@ -668,7 +671,11 @@ static int cmd_finalize(struct opal_dev *cmd, u32 hsn, u32 tsn)
 	struct opal_header *hdr;
 	int err = 0;
 
-	/* close the parameter list opened from cmd_start */
+	/*
+	 * Close the parameter list opened from cmd_start.
+	 * The number of bytes added must be equal to
+	 * CMD_FINALIZE_BYTES_NEEDED.
+	 */
 	add_token_u8(&err, cmd, OPAL_ENDLIST);
 
 	add_token_u8(&err, cmd, OPAL_ENDOFDATA);
@@ -1500,6 +1507,58 @@ static int set_mbr_enable_disable(struct opal_dev *dev, void *data)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
+static int write_shadow_mbr(struct opal_dev *dev, void *data)
+{
+	struct opal_shadow_mbr *shadow = data;
+	const u8 __user *src;
+	u8 *dst;
+	size_t off = 0;
+	u64 len;
+	int err = 0;
+
+	/* do the actual transmission(s) */
+	src = (u8 *) shadow->data;
+	while (off < shadow->size) {
+		err = cmd_start(dev, opaluid[OPAL_MBR], opalmethod[OPAL_SET]);
+		add_token_u8(&err, dev, OPAL_STARTNAME);
+		add_token_u8(&err, dev, OPAL_WHERE);
+		add_token_u64(&err, dev, shadow->offset + off);
+		add_token_u8(&err, dev, OPAL_ENDNAME);
+
+		add_token_u8(&err, dev, OPAL_STARTNAME);
+		add_token_u8(&err, dev, OPAL_VALUES);
+
+		/*
+		 * The bytestring header is either 1 or 2 bytes, so assume 2.
+		 * There also needs to be enough space to accommodate the
+		 * trailing OPAL_ENDNAME (1 byte) and tokens added by
+		 * cmd_finalize.
+		 */
+		len = min(remaining_size(dev) - (2+1+CMD_FINALIZE_BYTES_NEEDED),
+			  (size_t)(shadow->size - off));
+		pr_debug("MBR: write bytes %zu+%llu/%llu\n",
+			 off, len, shadow->size);
+
+		dst = add_bytestring_header(&err, dev, len);
+		if (!dst)
+			break;
+		if (copy_from_user(dst, src + off, len))
+			err = -EFAULT;
+		dev->pos += len;
+
+		add_token_u8(&err, dev, OPAL_ENDNAME);
+		if (err)
+			break;
+
+		err = finalize_and_send(dev, parse_and_check_status);
+		if (err)
+			break;
+
+		off += len;
+	}
+	return err;
+}
+
 static int generic_pw_cmd(u8 *key, size_t key_len, u8 *cpin_uid,
 			  struct opal_dev *dev)
 {
@@ -2045,6 +2104,31 @@ static int opal_mbr_status(struct opal_dev *dev, struct opal_mbr_data *opal_mbr)
 	return ret;
 }
 
+static int opal_write_shadow_mbr(struct opal_dev *dev,
+				 struct opal_shadow_mbr *info)
+{
+	const struct opal_step mbr_steps[] = {
+		{ opal_discovery0, },
+		{ start_admin1LSP_opal_session, &info->key },
+		{ write_shadow_mbr, info },
+		{ end_opal_session, },
+		{ NULL, }
+	};
+	int ret;
+
+	if (info->size == 0)
+		return 0;
+
+	if (!access_ok(info->data, info->size))
+		return -EINVAL;
+
+	mutex_lock(&dev->dev_lock);
+	setup_opal_dev(dev, mbr_steps);
+	ret = next(dev);
+	mutex_unlock(&dev->dev_lock);
+	return ret;
+}
+
 static int opal_save(struct opal_dev *dev, struct opal_lock_unlock *lk_unlk)
 {
 	struct opal_suspend_data *suspend;
@@ -2378,6 +2462,9 @@ int sed_ioctl(struct opal_dev *dev, unsigned int cmd, void __user *arg)
 	case IOC_OPAL_MBR_STATUS:
 		ret = opal_mbr_status(dev, p);
 		break;
+	case IOC_OPAL_WRITE_SHADOW_MBR:
+		ret = opal_write_shadow_mbr(dev, p);
+		break;
 	case IOC_OPAL_ERASE_LR:
 		ret = opal_erase_locking_range(dev, p);
 		break;
diff --git a/include/linux/sed-opal.h b/include/linux/sed-opal.h
index b38dc602cae3..cf08cdc13cbd 100644
--- a/include/linux/sed-opal.h
+++ b/include/linux/sed-opal.h
@@ -47,6 +47,7 @@ static inline bool is_sed_ioctl(unsigned int cmd)
 	case IOC_OPAL_ENABLE_DISABLE_MBR:
 	case IOC_OPAL_ERASE_LR:
 	case IOC_OPAL_SECURE_ERASE_LR:
+	case IOC_OPAL_WRITE_SHADOW_MBR:
 	case IOC_OPAL_MBR_STATUS:
 		return true;
 	}
diff --git a/include/uapi/linux/sed-opal.h b/include/uapi/linux/sed-opal.h
index 0cb9890cdc04..8e84307f66d4 100644
--- a/include/uapi/linux/sed-opal.h
+++ b/include/uapi/linux/sed-opal.h
@@ -104,6 +104,13 @@ struct opal_mbr_data {
 	__u8 __align[7];
 };
 
+struct opal_shadow_mbr {
+	struct opal_key key;
+	const __u64 data;
+	__u64 offset;
+	__u64 size;
+};
+
 #define IOC_OPAL_SAVE		    _IOW('p', 220, struct opal_lock_unlock)
 #define IOC_OPAL_LOCK_UNLOCK	    _IOW('p', 221, struct opal_lock_unlock)
 #define IOC_OPAL_TAKE_OWNERSHIP	    _IOW('p', 222, struct opal_key)
@@ -117,5 +124,6 @@ struct opal_mbr_data {
 #define IOC_OPAL_ERASE_LR           _IOW('p', 230, struct opal_session_info)
 #define IOC_OPAL_SECURE_ERASE_LR    _IOW('p', 231, struct opal_session_info)
 #define IOC_OPAL_MBR_STATUS         _IOW('p', 232, struct opal_mbr_data)
+#define IOC_OPAL_WRITE_SHADOW_MBR   _IOW('p', 233, struct opal_shadow_mbr)
 
 #endif /* _UAPI_SED_OPAL_H */
-- 
2.20.1

Re: [PATCH v3 11/16] block: sed-opal: ioctl for writing to shadow mbr

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:42PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> Allow modification of the shadow mbr. If the shadow mbr is not marked as
> done, this data will be presented read only as the device content. Only
> after marking the shadow mbr as done and unlocking a locking range the
> actual content is accessible.
> 
> Co-authored-by: David Kozub <zub@linux.fjfi.cvut.cz>
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 12/16] block: sed-opal: unify retrieval of table columns

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

Instead of having multiple places defining the same argument list to get
a specific column of a sed-opal table, provide a generic version and
call it from those functions.

Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/opal_proto.h |   2 +
 block/sed-opal.c   | 132 +++++++++++++++++----------------------------
 2 files changed, 50 insertions(+), 84 deletions(-)

diff --git a/block/opal_proto.h b/block/opal_proto.h
index e20be8258854..b6e352cfe982 100644
--- a/block/opal_proto.h
+++ b/block/opal_proto.h
@@ -170,6 +170,8 @@ enum opal_token {
 	OPAL_READLOCKED = 0x07,
 	OPAL_WRITELOCKED = 0x08,
 	OPAL_ACTIVEKEY = 0x0A,
+	/* lockingsp table */
+	OPAL_LIFECYCLE = 0x06,
 	/* locking info table */
 	OPAL_MAXRANGES = 0x04,
 	 /* mbr control */
diff --git a/block/sed-opal.c b/block/sed-opal.c
index 88c84906ce98..2459ac4d523b 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -1089,6 +1089,37 @@ static int finalize_and_send(struct opal_dev *dev, cont_fn cont)
 	return opal_send_recv(dev, cont);
 }
 
+/*
+ * request @column from table @table on device @dev. On success, the column
+ * data will be available in dev->resp->tok[4]
+ */
+static int generic_get_column(struct opal_dev *dev, const u8 *table,
+			      u64 column)
+{
+	int err;
+
+	err = cmd_start(dev, table, opalmethod[OPAL_GET]);
+
+	add_token_u8(&err, dev, OPAL_STARTLIST);
+
+	add_token_u8(&err, dev, OPAL_STARTNAME);
+	add_token_u8(&err, dev, OPAL_STARTCOLUMN);
+	add_token_u64(&err, dev, column);
+	add_token_u8(&err, dev, OPAL_ENDNAME);
+
+	add_token_u8(&err, dev, OPAL_STARTNAME);
+	add_token_u8(&err, dev, OPAL_ENDCOLUMN);
+	add_token_u64(&err, dev, column);
+	add_token_u8(&err, dev, OPAL_ENDNAME);
+
+	add_token_u8(&err, dev, OPAL_ENDLIST);
+
+	if (err)
+		return err;
+
+	return finalize_and_send(dev, parse_and_check_status);
+}
+
 static int gen_key(struct opal_dev *dev, void *data)
 {
 	u8 uid[OPAL_UID_LENGTH];
@@ -1143,23 +1174,11 @@ static int get_active_key(struct opal_dev *dev, void *data)
 	if (err)
 		return err;
 
-	err = cmd_start(dev, uid, opalmethod[OPAL_GET]);
-	add_token_u8(&err, dev, OPAL_STARTLIST);
-	add_token_u8(&err, dev, OPAL_STARTNAME);
-	add_token_u8(&err, dev, 3); /* startCloumn */
-	add_token_u8(&err, dev, 10); /* ActiveKey */
-	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_STARTNAME);
-	add_token_u8(&err, dev, 4); /* endColumn */
-	add_token_u8(&err, dev, 10); /* ActiveKey */
-	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
-	if (err) {
-		pr_debug("Error building get active key command\n");
+	err = generic_get_column(dev, uid, OPAL_ACTIVEKEY);
+	if (err)
 		return err;
-	}
 
-	return finalize_and_send(dev, get_active_key_cont);
+	return get_active_key_cont(dev);
 }
 
 static int generic_lr_enable_disable(struct opal_dev *dev,
@@ -1820,17 +1839,19 @@ static int activate_lsp(struct opal_dev *dev, void *data)
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
-static int get_lsp_lifecycle_cont(struct opal_dev *dev)
+/* Determine if we're in the Manufactured Inactive or Active state */
+static int get_lsp_lifecycle(struct opal_dev *dev, void *data)
 {
 	u8 lc_status;
-	int error = 0;
+	int err;
 
-	error = parse_and_check_status(dev);
-	if (error)
-		return error;
+	err = generic_get_column(dev, opaluid[OPAL_LOCKINGSP_UID],
+				 OPAL_LIFECYCLE);
+	if (err)
+		return err;
 
 	lc_status = response_get_u64(&dev->parsed, 4);
-	/* 0x08 is Manufacured Inactive */
+	/* 0x08 is Manufactured Inactive */
 	/* 0x09 is Manufactured */
 	if (lc_status != OPAL_MANUFACTURED_INACTIVE) {
 		pr_debug("Couldn't determine the status of the Lifecycle state\n");
@@ -1840,49 +1861,19 @@ static int get_lsp_lifecycle_cont(struct opal_dev *dev)
 	return 0;
 }
 
-/* Determine if we're in the Manufactured Inactive or Active state */
-static int get_lsp_lifecycle(struct opal_dev *dev, void *data)
-{
-	int err;
-
-	err = cmd_start(dev, opaluid[OPAL_LOCKINGSP_UID],
-			opalmethod[OPAL_GET]);
-
-	add_token_u8(&err, dev, OPAL_STARTLIST);
-
-	add_token_u8(&err, dev, OPAL_STARTNAME);
-	add_token_u8(&err, dev, 3); /* Start Column */
-	add_token_u8(&err, dev, 6); /* Lifecycle Column */
-	add_token_u8(&err, dev, OPAL_ENDNAME);
-
-	add_token_u8(&err, dev, OPAL_STARTNAME);
-	add_token_u8(&err, dev, 4); /* End Column */
-	add_token_u8(&err, dev, 6); /* Lifecycle Column */
-	add_token_u8(&err, dev, OPAL_ENDNAME);
-
-	add_token_u8(&err, dev, OPAL_ENDLIST);
-
-	if (err) {
-		pr_debug("Error Building GET Lifecycle Status command\n");
-		return err;
-	}
-
-	return finalize_and_send(dev, get_lsp_lifecycle_cont);
-}
-
-static int get_msid_cpin_pin_cont(struct opal_dev *dev)
+static int get_msid_cpin_pin(struct opal_dev *dev, void *data)
 {
 	const char *msid_pin;
 	size_t strlen;
-	int error = 0;
+	int err;
 
-	error = parse_and_check_status(dev);
-	if (error)
-		return error;
+	err = generic_get_column(dev, opaluid[OPAL_C_PIN_MSID], OPAL_PIN);
+	if (err)
+		return err;
 
 	strlen = response_get_string(&dev->parsed, 4, &msid_pin);
 	if (!msid_pin) {
-		pr_debug("%s: Couldn't extract PIN from response\n", __func__);
+		pr_debug("Couldn't extract MSID_CPIN from response\n");
 		return OPAL_INVAL_PARAM;
 	}
 
@@ -1895,33 +1886,6 @@ static int get_msid_cpin_pin_cont(struct opal_dev *dev)
 	return 0;
 }
 
-static int get_msid_cpin_pin(struct opal_dev *dev, void *data)
-{
-	int err;
-
-	err = cmd_start(dev, opaluid[OPAL_C_PIN_MSID],
-			opalmethod[OPAL_GET]);
-
-	add_token_u8(&err, dev, OPAL_STARTLIST);
-	add_token_u8(&err, dev, OPAL_STARTNAME);
-	add_token_u8(&err, dev, 3); /* Start Column */
-	add_token_u8(&err, dev, 3); /* PIN */
-	add_token_u8(&err, dev, OPAL_ENDNAME);
-
-	add_token_u8(&err, dev, OPAL_STARTNAME);
-	add_token_u8(&err, dev, 4); /* End Column */
-	add_token_u8(&err, dev, 3); /* Lifecycle Column */
-	add_token_u8(&err, dev, OPAL_ENDNAME);
-	add_token_u8(&err, dev, OPAL_ENDLIST);
-
-	if (err) {
-		pr_debug("Error building Get MSID CPIN PIN command.\n");
-		return err;
-	}
-
-	return finalize_and_send(dev, get_msid_cpin_pin_cont);
-}
-
 static int end_opal_session(struct opal_dev *dev, void *data)
 {
 	int err = 0;
-- 
2.20.1

Re: [PATCH v3 12/16] block: sed-opal: unify retrieval of table columns

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:43PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> Instead of having multiple places defining the same argument list to get
> a specific column of a sed-opal table, provide a generic version and
> call it from those functions.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 13/16] block: sed-opal: check size of shadow mbr

[David Kozub]

From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>

Check whether the shadow mbr does fit in the provided space on the
target. Also a proper firmware should handle this case and return an
error we may prevent problems or even damage with crappy firmwares.

Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
---
 block/opal_proto.h | 16 ++++++++++++++++
 block/sed-opal.c   | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/block/opal_proto.h b/block/opal_proto.h
index b6e352cfe982..5e8df3245eb0 100644
--- a/block/opal_proto.h
+++ b/block/opal_proto.h
@@ -106,6 +106,7 @@ enum opal_uid {
 	OPAL_ENTERPRISE_BANDMASTER0_UID,
 	OPAL_ENTERPRISE_ERASEMASTER_UID,
 	/* tables */
+	OPAL_TABLE_TABLE,
 	OPAL_LOCKINGRANGE_GLOBAL,
 	OPAL_LOCKINGRANGE_ACE_RDLOCKED,
 	OPAL_LOCKINGRANGE_ACE_WRLOCKED,
@@ -160,6 +161,21 @@ enum opal_token {
 	OPAL_STARTCOLUMN = 0x03,
 	OPAL_ENDCOLUMN = 0x04,
 	OPAL_VALUES = 0x01,
+	/* table table */
+	OPAL_TABLE_UID = 0x00,
+	OPAL_TABLE_NAME = 0x01,
+	OPAL_TABLE_COMMON = 0x02,
+	OPAL_TABLE_TEMPLATE = 0x03,
+	OPAL_TABLE_KIND = 0x04,
+	OPAL_TABLE_COLUMN = 0x05,
+	OPAL_TABLE_COLUMNS = 0x06,
+	OPAL_TABLE_ROWS = 0x07,
+	OPAL_TABLE_ROWS_FREE = 0x08,
+	OPAL_TABLE_ROW_BYTES = 0x09,
+	OPAL_TABLE_LASTID = 0x0A,
+	OPAL_TABLE_MIN = 0x0B,
+	OPAL_TABLE_MAX = 0x0C,
+
 	/* authority table */
 	OPAL_PIN = 0x03,
 	/* locking tokens */
diff --git a/block/sed-opal.c b/block/sed-opal.c
index 2459ac4d523b..3493bb979978 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -139,6 +139,8 @@ static const u8 opaluid[][OPAL_UID_LENGTH] = {
 
 	/* tables */
 
+	[OPAL_TABLE_TABLE]
+		{ 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01 },
 	[OPAL_LOCKINGRANGE_GLOBAL] =
 		{ 0x00, 0x00, 0x08, 0x02, 0x00, 0x00, 0x00, 0x01 },
 	[OPAL_LOCKINGRANGE_ACE_RDLOCKED] =
@@ -1120,6 +1122,29 @@ static int generic_get_column(struct opal_dev *dev, const u8 *table,
 	return finalize_and_send(dev, parse_and_check_status);
 }
 
+/*
+ * see TCG SAS 5.3.2.3 for a description of the available columns
+ *
+ * the result is provided in dev->resp->tok[4]
+ */
+static int generic_get_table_info(struct opal_dev *dev, enum opal_uid table,
+				  u64 column)
+{
+	u8 uid[OPAL_UID_LENGTH];
+	const unsigned int half = OPAL_UID_LENGTH/2;
+
+	/* sed-opal UIDs can be split in two halves:
+	 *  first:  actual table index
+	 *  second: relative index in the table
+	 * so we have to get the first half of the OPAL_TABLE_TABLE and use the
+	 * first part of the target table as relative index into that table
+	 */
+	memcpy(uid, opaluid[OPAL_TABLE_TABLE], half);
+	memcpy(uid+half, opaluid[table], half);
+
+	return generic_get_column(dev, uid, column);
+}
+
 static int gen_key(struct opal_dev *dev, void *data)
 {
 	u8 uid[OPAL_UID_LENGTH];
@@ -1535,6 +1560,20 @@ static int write_shadow_mbr(struct opal_dev *dev, void *data)
 	u64 len;
 	int err = 0;
 
+	/* do we fit in the available shadow mbr space? */
+	err = generic_get_table_info(dev, OPAL_MBR, OPAL_TABLE_ROWS);
+	if (err) {
+		pr_debug("MBR: could not get shadow size\n");
+		return err;
+	}
+
+	len = response_get_u64(&dev->parsed, 4);
+	if (shadow->size > len || shadow->offset > len - shadow->size) {
+		pr_debug("MBR: does not fit in shadow (%llu vs. %llu)\n",
+			 shadow->offset + shadow->size, len);
+		return -ENOSPC;
+	}
+
 	/* do the actual transmission(s) */
 	src = (u8 *) shadow->data;
 	while (off < shadow->size) {
-- 
2.20.1

Re: [PATCH v3 13/16] block: sed-opal: check size of shadow mbr

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:44PM +0100, David Kozub wrote:
> From: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
> 
> Check whether the shadow mbr does fit in the provided space on the
> target. Also a proper firmware should handle this case and return an
> error we may prevent problems or even damage with crappy firmwares.
> 
> Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 14/16] block: sed-opal: pass steps via argument rather than via opal_dev

[David Kozub]

The steps argument is only read by the next function, so it can
be passed directly as an argument rather than via opal_dev.

Normally, the steps is an array on the stack, so the pointer stops
being valid then the function that set opal_dev.steps returns.
If opal_dev.steps was not set to NULL before return it would become
a dangling pointer. When the steps are passed as argument this
becomes easier to see and more difficult to misuse.

Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
---
 block/sed-opal.c | 142 ++++++++++++++++++++---------------------------
 1 file changed, 61 insertions(+), 81 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 3493bb979978..21f2789a20cb 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -88,7 +88,6 @@ struct opal_dev {
 	void *data;
 	sec_send_recv *send_recv;
 
-	const struct opal_step *steps;
 	struct mutex dev_lock;
 	u16 comid;
 	u32 hsn;
@@ -387,19 +386,19 @@ static void check_geometry(struct opal_dev *dev, const void *data)
 	dev->lowest_lba = geo->lowest_aligned_lba;
 }
 
-static int next(struct opal_dev *dev)
+static int next(struct opal_dev *dev, const struct opal_step *steps,
+		size_t n_steps)
 {
 	const struct opal_step *step;
-	int state = 0, error = 0;
+	size_t state;
+	int error = 0;
 
-	do {
-		step = &dev->steps[state];
-		if (!step->fn)
-			break;
+	for (state = 0; !error && state < n_steps; state++) {
+		step = &steps[state];
 
 		error = step->fn(dev, step->data);
 		if (error) {
-			pr_debug("Step %d (%pS) failed wit error %d: %s\n",
+			pr_debug("Step %zu (%pS) failed with error %d: %s\n",
 				 state, step->fn, error,
 				 opal_error_to_human(error));
 
@@ -416,8 +415,7 @@ static int next(struct opal_dev *dev)
 			}
 
 		}
-		state++;
-	} while (!error);
+	}
 
 	return error;
 }
@@ -1941,17 +1939,13 @@ static int end_opal_session(struct opal_dev *dev, void *data)
 static int end_opal_session_error(struct opal_dev *dev)
 {
 	const struct opal_step error_end_session[] = {
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
-	dev->steps = error_end_session;
-	return next(dev);
+	return next(dev, error_end_session, ARRAY_SIZE(error_end_session));
 }
 
-static inline void setup_opal_dev(struct opal_dev *dev,
-				  const struct opal_step *steps)
+static inline void setup_opal_dev(struct opal_dev *dev)
 {
-	dev->steps = steps;
 	dev->tsn = 0;
 	dev->hsn = 0;
 	dev->prev_data = NULL;
@@ -1960,14 +1954,13 @@ static inline void setup_opal_dev(struct opal_dev *dev,
 static int check_opal_support(struct opal_dev *dev)
 {
 	const struct opal_step steps[] = {
-		{ opal_discovery0, },
-		{ NULL, }
+		{ opal_discovery0, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, steps, ARRAY_SIZE(steps));
 	dev->supported = !ret;
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2024,14 +2017,13 @@ static int opal_secure_erase_locking_range(struct opal_dev *dev,
 		{ start_auth_opal_session, opal_session },
 		{ get_active_key, &opal_session->opal_key.lr },
 		{ gen_key, },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, erase_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, erase_steps, ARRAY_SIZE(erase_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2043,14 +2035,13 @@ static int opal_erase_locking_range(struct opal_dev *dev,
 		{ opal_discovery0, },
 		{ start_auth_opal_session, opal_session },
 		{ erase_locking_range, opal_session },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, erase_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, erase_steps, ARRAY_SIZE(erase_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2067,8 +2058,7 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 		{ end_opal_session, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
 		{ set_mbr_enable_disable, &token },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2077,8 +2067,8 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 		return -EINVAL;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, mbr_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2091,8 +2081,7 @@ static int opal_mbr_status(struct opal_dev *dev, struct opal_mbr_data *opal_mbr)
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
 		{ set_mbr_done, &token },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2101,8 +2090,8 @@ static int opal_mbr_status(struct opal_dev *dev, struct opal_mbr_data *opal_mbr)
 		return -EINVAL;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, mbr_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2114,8 +2103,7 @@ static int opal_write_shadow_mbr(struct opal_dev *dev,
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &info->key },
 		{ write_shadow_mbr, info },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2126,8 +2114,8 @@ static int opal_write_shadow_mbr(struct opal_dev *dev,
 		return -EINVAL;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, mbr_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2144,7 +2132,7 @@ static int opal_save(struct opal_dev *dev, struct opal_lock_unlock *lk_unlk)
 	suspend->lr = lk_unlk->session.opal_key.lr;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, NULL);
+	setup_opal_dev(dev);
 	add_suspend_info(dev, suspend);
 	mutex_unlock(&dev->dev_lock);
 	return 0;
@@ -2157,8 +2145,7 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &lk_unlk->session.opal_key },
 		{ add_user_to_lr, lk_unlk },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2180,8 +2167,8 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
 	}
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, steps, ARRAY_SIZE(steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2191,14 +2178,13 @@ static int opal_reverttper(struct opal_dev *dev, struct opal_key *opal)
 	const struct opal_step revert_steps[] = {
 		{ opal_discovery0, },
 		{ start_SIDASP_opal_session, opal },
-		{ revert_tper, }, /* controller will terminate session */
-		{ NULL, }
+		{ revert_tper, } /* controller will terminate session */
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, revert_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, revert_steps, ARRAY_SIZE(revert_steps));
 	mutex_unlock(&dev->dev_lock);
 
 	/*
@@ -2218,19 +2204,20 @@ static int __opal_lock_unlock(struct opal_dev *dev,
 		{ opal_discovery0, },
 		{ start_auth_opal_session, &lk_unlk->session },
 		{ lock_unlock_locking_range, lk_unlk },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	const struct opal_step unlock_sum_steps[] = {
 		{ opal_discovery0, },
 		{ start_auth_opal_session, &lk_unlk->session },
 		{ lock_unlock_locking_range_sum, lk_unlk },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 
-	dev->steps = lk_unlk->session.sum ? unlock_sum_steps : unlock_steps;
-	return next(dev);
+	if (lk_unlk->session.sum)
+		return next(dev, unlock_sum_steps,
+			    ARRAY_SIZE(unlock_sum_steps));
+	else
+		return next(dev, unlock_steps, ARRAY_SIZE(unlock_steps));
 }
 
 static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
@@ -2240,12 +2227,10 @@ static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, key },
 		{ set_mbr_done, &mbr_done_tf },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 
-	dev->steps = mbrdone_step;
-	return next(dev);
+	return next(dev, mbrdone_step, ARRAY_SIZE(mbrdone_step));
 }
 
 static int opal_lock_unlock(struct opal_dev *dev,
@@ -2272,8 +2257,7 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 		{ end_opal_session, },
 		{ start_SIDASP_opal_session, opal },
 		{ set_sid_cpin_pin, opal },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2281,8 +2265,8 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 		return -ENODEV;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, owner_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, owner_steps, ARRAY_SIZE(owner_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2295,8 +2279,7 @@ static int opal_activate_lsp(struct opal_dev *dev,
 		{ start_SIDASP_opal_session, &opal_lr_act->key },
 		{ get_lsp_lifecycle, },
 		{ activate_lsp, opal_lr_act },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2304,8 +2287,8 @@ static int opal_activate_lsp(struct opal_dev *dev,
 		return -EINVAL;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, active_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, active_steps, ARRAY_SIZE(active_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2317,14 +2300,13 @@ static int opal_setup_locking_range(struct opal_dev *dev,
 		{ opal_discovery0, },
 		{ start_auth_opal_session, &opal_lrs->session },
 		{ setup_locking_range, opal_lrs },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, lr_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, lr_steps, ARRAY_SIZE(lr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2335,8 +2317,7 @@ static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
 		{ opal_discovery0, },
 		{ start_auth_opal_session, &opal_pw->session },
 		{ set_new_pw, &opal_pw->new_user_pw },
-		{ end_opal_session, },
-		{ NULL }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2347,8 +2328,8 @@ static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
 		return -EINVAL;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, pw_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, pw_steps, ARRAY_SIZE(pw_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2360,8 +2341,7 @@ static int opal_activate_user(struct opal_dev *dev,
 		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &opal_session->opal_key },
 		{ internal_activate_user, opal_session },
-		{ end_opal_session, },
-		{ NULL, }
+		{ end_opal_session, }
 	};
 	int ret;
 
@@ -2373,8 +2353,8 @@ static int opal_activate_user(struct opal_dev *dev,
 	}
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, act_steps);
-	ret = next(dev);
+	setup_opal_dev(dev);
+	ret = next(dev, act_steps, ARRAY_SIZE(act_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2391,7 +2371,7 @@ bool opal_unlock_from_suspend(struct opal_dev *dev)
 		return false;
 
 	mutex_lock(&dev->dev_lock);
-	setup_opal_dev(dev, NULL);
+	setup_opal_dev(dev);
 
 	list_for_each_entry(suspend, &dev->unlk_lst, node) {
 		dev->tsn = 0;
-- 
2.20.1

Re: [PATCH v3 14/16] block: sed-opal: pass steps via argument rather than via opal_dev

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:45PM +0100, David Kozub wrote:
> The steps argument is only read by the next function, so it can
> be passed directly as an argument rather than via opal_dev.
> 
> Normally, the steps is an array on the stack, so the pointer stops
> being valid then the function that set opal_dev.steps returns.
> If opal_dev.steps was not set to NULL before return it would become
> a dangling pointer. When the steps are passed as argument this
> becomes easier to see and more difficult to misuse.
> 
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 15/16] block: sed-opal: don't repeat opal_discovery0 in each steps array

[David Kozub]

Originally each of the opal functions that call next include
opal_discovery0 in the array of steps. This is superfluous and
can be done always inside next.

Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
---
 block/sed-opal.c | 89 +++++++++++++++++++++++-------------------------
 1 file changed, 43 insertions(+), 46 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 21f2789a20cb..3362741dd198 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -221,6 +221,7 @@ static const u8 opalmethod[][OPAL_METHOD_LENGTH] = {
 };
 
 static int end_opal_session_error(struct opal_dev *dev);
+static int opal_discovery0_step(struct opal_dev *dev);
 
 struct opal_suspend_data {
 	struct opal_lock_unlock unlk;
@@ -386,36 +387,42 @@ static void check_geometry(struct opal_dev *dev, const void *data)
 	dev->lowest_lba = geo->lowest_aligned_lba;
 }
 
+static int execute_step(struct opal_dev *dev,
+			const struct opal_step *step, size_t stepIndex)
+{
+	int error = step->fn(dev, step->data);
+
+	if (error) {
+		pr_debug("Step %zu (%pS) failed with error %d: %s\n",
+			 stepIndex, step->fn, error,
+			 opal_error_to_human(error));
+	}
+
+	return error;
+}
+
 static int next(struct opal_dev *dev, const struct opal_step *steps,
 		size_t n_steps)
 {
-	const struct opal_step *step;
 	size_t state;
-	int error = 0;
+	int error;
 
-	for (state = 0; !error && state < n_steps; state++) {
-		step = &steps[state];
-
-		error = step->fn(dev, step->data);
-		if (error) {
-			pr_debug("Step %zu (%pS) failed with error %d: %s\n",
-				 state, step->fn, error,
-				 opal_error_to_human(error));
-
-			/* For each OPAL command we do a discovery0 then we
-			 * start some sort of session.
-			 * If we haven't passed state 1 then there was an error
-			 * on discovery0 or during the attempt to start a
-			 * session. Therefore we shouldn't attempt to terminate
-			 * a session, as one has not yet been created.
-			 */
-			if (state > 1) {
-				end_opal_session_error(dev);
-				return error;
-			}
+	/* first do a discovery0 */
+	error = opal_discovery0_step(dev);
 
-		}
-	}
+	for (state = 0; !error && state < n_steps; state++)
+		error = execute_step(dev, &steps[state], state);
+
+	/*
+	 * For each OPAL command the first step in steps starts some sort of
+	 * session. If an error occurred in the initial discovery0 or if an
+	 * error occurred in the first step (and thus stopping the loop with
+	 * state == 1) then there was an error before or during the attempt to
+	 * start a session. Therefore we shouldn't attempt to terminate a
+	 * session, as one has not yet been created.
+	 */
+	if (error && state > 1)
+		end_opal_session_error(dev);
 
 	return error;
 }
@@ -513,6 +520,14 @@ static int opal_discovery0(struct opal_dev *dev, void *data)
 	return opal_discovery0_end(dev);
 }
 
+static int opal_discovery0_step(struct opal_dev *dev)
+{
+	const struct opal_step discovery0_step = {
+		opal_discovery0,
+	};
+	return execute_step(dev, &discovery0_step, 0);
+}
+
 static size_t remaining_size(struct opal_dev *cmd)
 {
 	return IO_BUFFER_LENGTH - cmd->pos;
@@ -1938,10 +1953,10 @@ static int end_opal_session(struct opal_dev *dev, void *data)
 
 static int end_opal_session_error(struct opal_dev *dev)
 {
-	const struct opal_step error_end_session[] = {
-		{ end_opal_session, }
+	const struct opal_step error_end_session = {
+		end_opal_session,
 	};
-	return next(dev, error_end_session, ARRAY_SIZE(error_end_session));
+	return execute_step(dev, &error_end_session, 0);
 }
 
 static inline void setup_opal_dev(struct opal_dev *dev)
@@ -1953,14 +1968,11 @@ static inline void setup_opal_dev(struct opal_dev *dev)
 
 static int check_opal_support(struct opal_dev *dev)
 {
-	const struct opal_step steps[] = {
-		{ opal_discovery0, }
-	};
 	int ret;
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, steps, ARRAY_SIZE(steps));
+	ret = opal_discovery0_step(dev);
 	dev->supported = !ret;
 	mutex_unlock(&dev->dev_lock);
 	return ret;
@@ -2013,7 +2025,6 @@ static int opal_secure_erase_locking_range(struct opal_dev *dev,
 					   struct opal_session_info *opal_session)
 {
 	const struct opal_step erase_steps[] = {
-		{ opal_discovery0, },
 		{ start_auth_opal_session, opal_session },
 		{ get_active_key, &opal_session->opal_key.lr },
 		{ gen_key, },
@@ -2032,7 +2043,6 @@ static int opal_erase_locking_range(struct opal_dev *dev,
 				    struct opal_session_info *opal_session)
 {
 	const struct opal_step erase_steps[] = {
-		{ opal_discovery0, },
 		{ start_auth_opal_session, opal_session },
 		{ erase_locking_range, opal_session },
 		{ end_opal_session, }
@@ -2052,7 +2062,6 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 	u8 token = opal_mbr->enable_disable == OPAL_MBR_ENABLE
 		? OPAL_TRUE : OPAL_FALSE;
 	const struct opal_step mbr_steps[] = {
-		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
 		{ set_mbr_done, &token },
 		{ end_opal_session, },
@@ -2078,7 +2087,6 @@ static int opal_mbr_status(struct opal_dev *dev, struct opal_mbr_data *opal_mbr)
 	u8 token = opal_mbr->enable_disable == OPAL_MBR_ENABLE
 		? OPAL_TRUE : OPAL_FALSE;
 	const struct opal_step mbr_steps[] = {
-		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &opal_mbr->key },
 		{ set_mbr_done, &token },
 		{ end_opal_session, }
@@ -2100,7 +2108,6 @@ static int opal_write_shadow_mbr(struct opal_dev *dev,
 				 struct opal_shadow_mbr *info)
 {
 	const struct opal_step mbr_steps[] = {
-		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &info->key },
 		{ write_shadow_mbr, info },
 		{ end_opal_session, }
@@ -2142,7 +2149,6 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
 			       struct opal_lock_unlock *lk_unlk)
 {
 	const struct opal_step steps[] = {
-		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &lk_unlk->session.opal_key },
 		{ add_user_to_lr, lk_unlk },
 		{ end_opal_session, }
@@ -2176,7 +2182,6 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
 static int opal_reverttper(struct opal_dev *dev, struct opal_key *opal)
 {
 	const struct opal_step revert_steps[] = {
-		{ opal_discovery0, },
 		{ start_SIDASP_opal_session, opal },
 		{ revert_tper, } /* controller will terminate session */
 	};
@@ -2201,13 +2206,11 @@ static int __opal_lock_unlock(struct opal_dev *dev,
 			      struct opal_lock_unlock *lk_unlk)
 {
 	const struct opal_step unlock_steps[] = {
-		{ opal_discovery0, },
 		{ start_auth_opal_session, &lk_unlk->session },
 		{ lock_unlock_locking_range, lk_unlk },
 		{ end_opal_session, }
 	};
 	const struct opal_step unlock_sum_steps[] = {
-		{ opal_discovery0, },
 		{ start_auth_opal_session, &lk_unlk->session },
 		{ lock_unlock_locking_range_sum, lk_unlk },
 		{ end_opal_session, }
@@ -2224,7 +2227,6 @@ static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
 {
 	u8 mbr_done_tf = 1;
 	const struct opal_step mbrdone_step[] = {
-		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, key },
 		{ set_mbr_done, &mbr_done_tf },
 		{ end_opal_session, }
@@ -2251,7 +2253,6 @@ static int opal_lock_unlock(struct opal_dev *dev,
 static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 {
 	const struct opal_step owner_steps[] = {
-		{ opal_discovery0, },
 		{ start_anybodyASP_opal_session, },
 		{ get_msid_cpin_pin, },
 		{ end_opal_session, },
@@ -2275,7 +2276,6 @@ static int opal_activate_lsp(struct opal_dev *dev,
 			     struct opal_lr_act *opal_lr_act)
 {
 	const struct opal_step active_steps[] = {
-		{ opal_discovery0, },
 		{ start_SIDASP_opal_session, &opal_lr_act->key },
 		{ get_lsp_lifecycle, },
 		{ activate_lsp, opal_lr_act },
@@ -2297,7 +2297,6 @@ static int opal_setup_locking_range(struct opal_dev *dev,
 				    struct opal_user_lr_setup *opal_lrs)
 {
 	const struct opal_step lr_steps[] = {
-		{ opal_discovery0, },
 		{ start_auth_opal_session, &opal_lrs->session },
 		{ setup_locking_range, opal_lrs },
 		{ end_opal_session, }
@@ -2314,7 +2313,6 @@ static int opal_setup_locking_range(struct opal_dev *dev,
 static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
 {
 	const struct opal_step pw_steps[] = {
-		{ opal_discovery0, },
 		{ start_auth_opal_session, &opal_pw->session },
 		{ set_new_pw, &opal_pw->new_user_pw },
 		{ end_opal_session, }
@@ -2338,7 +2336,6 @@ static int opal_activate_user(struct opal_dev *dev,
 			      struct opal_session_info *opal_session)
 {
 	const struct opal_step act_steps[] = {
-		{ opal_discovery0, },
 		{ start_admin1LSP_opal_session, &opal_session->opal_key },
 		{ internal_activate_user, opal_session },
 		{ end_opal_session, }
-- 
2.20.1

Re: [PATCH v3 15/16] block: sed-opal: don't repeat opal_discovery0 in each steps array

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:46PM +0100, David Kozub wrote:
> Originally each of the opal functions that call next include
> opal_discovery0 in the array of steps. This is superfluous and
> can be done always inside next.
> 
> Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>

[PATCH v3 16/16] block: sed-opal: rename next to execute_steps

[David Kozub]

As the function is responsible for executing the individual steps supplied
in the steps argument, execute_steps is a more descriptive name than the
rather generic next.

Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
---
 block/sed-opal.c | 37 +++++++++++++++++++------------------
 1 file changed, 19 insertions(+), 18 deletions(-)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 3362741dd198..c09149dd5e0a 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -401,8 +401,8 @@ static int execute_step(struct opal_dev *dev,
 	return error;
 }
 
-static int next(struct opal_dev *dev, const struct opal_step *steps,
-		size_t n_steps)
+static int execute_steps(struct opal_dev *dev,
+			 const struct opal_step *steps, size_t n_steps)
 {
 	size_t state;
 	int error;
@@ -2034,7 +2034,7 @@ static int opal_secure_erase_locking_range(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, erase_steps, ARRAY_SIZE(erase_steps));
+	ret = execute_steps(dev, erase_steps, ARRAY_SIZE(erase_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2051,7 +2051,7 @@ static int opal_erase_locking_range(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, erase_steps, ARRAY_SIZE(erase_steps));
+	ret = execute_steps(dev, erase_steps, ARRAY_SIZE(erase_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2077,7 +2077,7 @@ static int opal_enable_disable_shadow_mbr(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
+	ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2099,7 +2099,7 @@ static int opal_mbr_status(struct opal_dev *dev, struct opal_mbr_data *opal_mbr)
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
+	ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2122,7 +2122,7 @@ static int opal_write_shadow_mbr(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
+	ret = execute_steps(dev, mbr_steps, ARRAY_SIZE(mbr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2174,7 +2174,7 @@ static int opal_add_user_to_lr(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, steps, ARRAY_SIZE(steps));
+	ret = execute_steps(dev, steps, ARRAY_SIZE(steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2189,7 +2189,7 @@ static int opal_reverttper(struct opal_dev *dev, struct opal_key *opal)
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, revert_steps, ARRAY_SIZE(revert_steps));
+	ret = execute_steps(dev, revert_steps, ARRAY_SIZE(revert_steps));
 	mutex_unlock(&dev->dev_lock);
 
 	/*
@@ -2217,10 +2217,11 @@ static int __opal_lock_unlock(struct opal_dev *dev,
 	};
 
 	if (lk_unlk->session.sum)
-		return next(dev, unlock_sum_steps,
-			    ARRAY_SIZE(unlock_sum_steps));
+		return execute_steps(dev, unlock_sum_steps,
+				     ARRAY_SIZE(unlock_sum_steps));
 	else
-		return next(dev, unlock_steps, ARRAY_SIZE(unlock_steps));
+		return execute_steps(dev, unlock_steps,
+				     ARRAY_SIZE(unlock_steps));
 }
 
 static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
@@ -2232,7 +2233,7 @@ static int __opal_set_mbr_done(struct opal_dev *dev, struct opal_key *key)
 		{ end_opal_session, }
 	};
 
-	return next(dev, mbrdone_step, ARRAY_SIZE(mbrdone_step));
+	return execute_steps(dev, mbrdone_step, ARRAY_SIZE(mbrdone_step));
 }
 
 static int opal_lock_unlock(struct opal_dev *dev,
@@ -2267,7 +2268,7 @@ static int opal_take_ownership(struct opal_dev *dev, struct opal_key *opal)
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, owner_steps, ARRAY_SIZE(owner_steps));
+	ret = execute_steps(dev, owner_steps, ARRAY_SIZE(owner_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2288,7 +2289,7 @@ static int opal_activate_lsp(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, active_steps, ARRAY_SIZE(active_steps));
+	ret = execute_steps(dev, active_steps, ARRAY_SIZE(active_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2305,7 +2306,7 @@ static int opal_setup_locking_range(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, lr_steps, ARRAY_SIZE(lr_steps));
+	ret = execute_steps(dev, lr_steps, ARRAY_SIZE(lr_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2327,7 +2328,7 @@ static int opal_set_new_pw(struct opal_dev *dev, struct opal_new_pw *opal_pw)
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, pw_steps, ARRAY_SIZE(pw_steps));
+	ret = execute_steps(dev, pw_steps, ARRAY_SIZE(pw_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
@@ -2351,7 +2352,7 @@ static int opal_activate_user(struct opal_dev *dev,
 
 	mutex_lock(&dev->dev_lock);
 	setup_opal_dev(dev);
-	ret = next(dev, act_steps, ARRAY_SIZE(act_steps));
+	ret = execute_steps(dev, act_steps, ARRAY_SIZE(act_steps));
 	mutex_unlock(&dev->dev_lock);
 	return ret;
 }
-- 
2.20.1

Re: [PATCH v3 00/16] block: sed-opal: support shadow MBR done flag and write

[Scott Bauer]

On Tue, Jan 22, 2019 at 11:31:31PM +0100, David Kozub wrote:
> This patch series extends OPAL support: it adds IOCTL for setting the shadow
> MBR done flag which can be useful for unlocking an OPAL disk on boot and it adds
> IOCTL for writing to the shadow MBR. Also included are some minor fixes and
> improvements.
> 
> This series is based on the original work done by Jonas Rabenstein which was
> submitted in March 2018.[1] I tried to apply suggestions made in review on the
> list and do some further improvements.
> 
> The most contentious issue in the original series was the IOCTL for shadow MBR
> write but I think no better approach was found[2] so this was not changed. I'm
> open to suggestions.
> 
> There is a fork of sed-opal-temp that can use these new IOCTLs.[3] I tested
> these on Samsung 840 EVO and 850 EVO drives, on x86-64 and arm64 systems.
> 
> The series applies on v5.0-rc3.
> 
> Changes from v2 to v3:
> * review suggestions from Scott Bauer
> 
> As Scott suggested I tried to do a more thorough testing, esp. with things like
> wrong passwords/invalid values. I did not observe any crash or unexpected
> behavior.
> 
> David Kozub (8):
>   block: sed-opal: fix typos and formatting
>   block: sed-opal: close parameter list in cmd_finalize
>   block: sed-opal: unify cmd start
>   block: sed-opal: unify error handling of responses
>   block: sed-opal: reuse response_get_token to decrease code duplication
>   block: sed-opal: pass steps via argument rather than via opal_dev
>   block: sed-opal: don't repeat opal_discovery0 in each steps array
>   block: sed-opal: rename next to execute_steps
> 

You forgot to send 16/16 again in v3. I pulled and tested off your github page.
If you send a v4 or just resend that patch you can add my reviewed-by, as I reviewed it
on my tree/from your github.

Re: [PATCH v3 00/16] block: sed-opal: support shadow MBR done flag and write

[David Kozub]

On Sun, 27 Jan 2019, Scott Bauer wrote:

> On Tue, Jan 22, 2019 at 11:31:31PM +0100, David Kozub wrote:
>> David Kozub (8):
>>   block: sed-opal: fix typos and formatting
>>   block: sed-opal: close parameter list in cmd_finalize
>>   block: sed-opal: unify cmd start
>>   block: sed-opal: unify error handling of responses
>>   block: sed-opal: reuse response_get_token to decrease code duplication
>>   block: sed-opal: pass steps via argument rather than via opal_dev
>>   block: sed-opal: don't repeat opal_discovery0 in each steps array
>>   block: sed-opal: rename next to execute_steps
>>
>
> You forgot to send 16/16 again in v3. I pulled and tested off your github page.
> If you send a v4 or just resend that patch you can add my reviewed-by, as I reviewed it
> on my tree/from your github.

Hi Scott. Thank you for the review.

W.r.t. the 16th patch: I think I sent it, after all I also see it in 
lore.kernel.org:

https://lore.kernel.org/lkml/1548196307-12987-17-git-send-email-zub@linux.fjfi.cvut.cz/

Anyway, if the best way forward is to send v4, I'll do it.

Best regards,
David