linux-kernel - [PATCHv4 4/6] fpga: of-fpga-region: add authenticate-fpga-config property

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Date:   Mon,  1 Feb 2021 09:21:57 -0600
From:   richard.gong@...ux.intel.com
To:     mdf@...nel.org, trix@...hat.com, gregkh@...uxfoundation.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Richard Gong <richard.gong@...el.com>
Subject: [PATCHv4 4/6] fpga: of-fpga-region: add authenticate-fpga-config property

From: Richard Gong <richard.gong@...el.com>

Add authenticate-fpga-config property to support FPGA bitstream
authentication, which makes sure a signed bitstream has valid signatures.

Signed-off-by: Richard Gong <richard.gong@...el.com>
---
v4: add additional checks to make sure *only* authenticate
v3: no change
v2: changed in alphabetical order
---
 drivers/fpga/of-fpga-region.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index e405309..5074479 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -218,15 +218,25 @@ static struct fpga_image_info *of_fpga_region_parse_ov(
 
 	info->overlay = overlay;
 
-	/* Read FPGA region properties from the overlay */
-	if (of_property_read_bool(overlay, "partial-fpga-config"))
-		info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
+	/*
+	 * Read FPGA region properties from the overlay.
+	 *
+	 * First check the integrity of the bitstream. If the
+	 * authentication is passed, the user can perform other
+	 * operations.
+	 */
+	if (of_property_read_bool(overlay, "authenticate-fpga-config")) {
+		info->flags |= FPGA_MGR_BITSTREAM_AUTHENTICATE;
+	} else {
+		if (of_property_read_bool(overlay, "partial-fpga-config"))
+			info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
 
-	if (of_property_read_bool(overlay, "external-fpga-config"))
-		info->flags |= FPGA_MGR_EXTERNAL_CONFIG;
+		if (of_property_read_bool(overlay, "external-fpga-config"))
+			info->flags |= FPGA_MGR_EXTERNAL_CONFIG;
 
-	if (of_property_read_bool(overlay, "encrypted-fpga-config"))
-		info->flags |= FPGA_MGR_ENCRYPTED_BITSTREAM;
+		if (of_property_read_bool(overlay, "encrypted-fpga-config"))
+			info->flags |= FPGA_MGR_ENCRYPTED_BITSTREAM;
+	}
 
 	if (!of_property_read_string(overlay, "firmware-name",
 				     &firmware_name)) {
-- 
2.7.4