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[SRU,J:linux-bluefield,v1,1/1] mlxbf-bootctl: correctly identify secure boot with development keys

Message ID 5617062d7582c7c7ef7ee6168941744401ababbe.1701967848.git.davthompson@nvidia.com
State New
Headers show
Series mlxbf-bootctl: fails to report info about cards using dev keys | expand

Commit Message

David Thompson Dec. 7, 2023, 5:06 p.m. UTC
BugLink: https://bugs.launchpad.net/bugs/2045919

The secure boot state of the BlueField SoC is represented by two bits:
                0 = production state
                1 = secure boot enabled
                2 = non-secure (secure boot disabled)
                3 = RMA state
There is also a single bit to indicate whether production keys or
development keys are being used when secure boot is enabled.
This single bit (specified by MLXBF_BOOTCTL_SB_DEV_MASK) only has
meaning if secure boot state equals 1 (secure boot enabled).

The secure boot states are as follows:
- “GA secured” is when secure boot is enabled with official production keys.
- “Secured (development)” is when secure boot is enabled with development keys.

Without this fix “GA Secured” is displayed on development cards which is
misleading. This patch updates the logic in "lifecycle_state_show()" to
handle the case where the SoC is configured for secure boot and is using
development keys.

Fixes: 79e29cb8fbc5c ("platform/mellanox: Add bootctl driver for Mellanox BlueField Soc")
Reviewed-by: Khalil Blaiech <kblaiech@nvidia.com>
Signed-off-by: David Thompson <davthompson@nvidia.com>
Link: https://lore.kernel.org/r/20231130183515.17214-1-davthompson@nvidia.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
(cherry picked from commit d4eef75279f5e9d594f5785502038c763ce42268)
Signed-off-by: David Thompson <davthompson@nvidia.com>
---
 drivers/platform/mellanox/mlxbf-bootctl.c | 39 +++++++++++++++--------
 1 file changed, 26 insertions(+), 13 deletions(-)
diff mbox series

Patch

diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c b/drivers/platform/mellanox/mlxbf-bootctl.c
index 858b3b689119..99924b0b149f 100644
--- a/drivers/platform/mellanox/mlxbf-bootctl.c
+++ b/drivers/platform/mellanox/mlxbf-bootctl.c
@@ -20,6 +20,7 @@ 
 
 #define MLXBF_BOOTCTL_SB_SECURE_MASK		0x03
 #define MLXBF_BOOTCTL_SB_TEST_MASK		0x0c
+#define MLXBF_BOOTCTL_SB_DEV_MASK		BIT(4)
 
 #define MLXBF_SB_KEY_NUM			4
 
@@ -40,11 +41,18 @@  static struct mlxbf_bootctl_name boot_names[] = {
 	{ MLXBF_BOOTCTL_NONE, "none" },
 };
 
+enum {
+	MLXBF_BOOTCTL_SB_LIFECYCLE_PRODUCTION = 0,
+	MLXBF_BOOTCTL_SB_LIFECYCLE_GA_SECURE = 1,
+	MLXBF_BOOTCTL_SB_LIFECYCLE_GA_NON_SECURE = 2,
+	MLXBF_BOOTCTL_SB_LIFECYCLE_RMA = 3
+};
+
 static const char * const mlxbf_bootctl_lifecycle_states[] = {
-	[0] = "Production",
-	[1] = "GA Secured",
-	[2] = "GA Non-Secured",
-	[3] = "RMA",
+	[MLXBF_BOOTCTL_SB_LIFECYCLE_PRODUCTION] = "Production",
+	[MLXBF_BOOTCTL_SB_LIFECYCLE_GA_SECURE] = "GA Secured",
+	[MLXBF_BOOTCTL_SB_LIFECYCLE_GA_NON_SECURE] = "GA Non-Secured",
+	[MLXBF_BOOTCTL_SB_LIFECYCLE_RMA] = "RMA",
 };
 
 /* Log header format. */
@@ -409,25 +417,30 @@  static ssize_t second_reset_action_store(struct device *dev,
 static ssize_t lifecycle_state_show(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
+	int status_bits;
+	int use_dev_key;
+	int test_state;
 	int lc_state;
 
-	lc_state = mlxbf_bootctl_smc(MLXBF_BOOTCTL_GET_TBB_FUSE_STATUS,
-				     MLXBF_BOOTCTL_FUSE_STATUS_LIFECYCLE);
-	if (lc_state < 0)
-		return lc_state;
+	status_bits = mlxbf_bootctl_smc(MLXBF_BOOTCTL_GET_TBB_FUSE_STATUS,
+					MLXBF_BOOTCTL_FUSE_STATUS_LIFECYCLE);
+	if (status_bits < 0)
+		return status_bits;
 
-	lc_state &=
-		MLXBF_BOOTCTL_SB_TEST_MASK | MLXBF_BOOTCTL_SB_SECURE_MASK;
+	use_dev_key = status_bits & MLXBF_BOOTCTL_SB_DEV_MASK;
+	test_state = status_bits & MLXBF_BOOTCTL_SB_TEST_MASK;
+	lc_state = status_bits & MLXBF_BOOTCTL_SB_SECURE_MASK;
 
 	/*
 	 * If the test bits are set, we specify that the current state may be
 	 * due to using the test bits.
 	 */
-	if (lc_state & MLXBF_BOOTCTL_SB_TEST_MASK) {
-		lc_state &= MLXBF_BOOTCTL_SB_SECURE_MASK;
-
+	if (test_state) {
 		return sprintf(buf, "%s(test)\n",
 			       mlxbf_bootctl_lifecycle_states[lc_state]);
+	} else if (use_dev_key &&
+		   (lc_state == MLXBF_BOOTCTL_SB_LIFECYCLE_GA_SECURE)) {
+		return sprintf(buf, "Secured (development)\n");
 	}
 
 	return sprintf(buf, "%s\n", mlxbf_bootctl_lifecycle_states[lc_state]);