[PATCH v1 3/7] ufs: rpmb: derive the per-region RPMB CID and size for OP-TEE

[Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>]

Read the UFS device, unit and geometry descriptors to report each RPMB
region's size and reliable-write count, and build a 16-byte CID by
BLAKE2b-hashing the same device-id string the Linux kernel derives
(ufshcd_create_device_id() plus a "-R<region>" suffix), so OP-TEE derives
an RPMB key that matches Linux. Exposed via ufs_rpmb_get_region_info().

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>
---
 drivers/ufs/ufs-rpmb.c   | 135 ++++++++++++++++++++++++++++++++++++++-
 drivers/ufs/ufs-uclass.c |   4 +-
 drivers/ufs/ufs.h        |  11 ++++
 include/ufs.h            |   6 +-
 4 files changed, 151 insertions(+), 5 deletions(-)

diff --git a/drivers/ufs/ufs-rpmb.c b/drivers/ufs/ufs-rpmb.c
index 636ccb6e74f..7919162ddae 100644
--- a/drivers/ufs/ufs-rpmb.c
+++ b/drivers/ufs/ufs-rpmb.c
@@ -1,8 +1,12 @@
 // SPDX-License-Identifier: GPL-2.0+
 #include <dm.h>
+#include <hexdump.h>
 #include <log.h>
 #include <scsi.h>
 #include <ufs.h>
+#include <vsprintf.h>
+#include <u-boot/blake2.h>
+#include <asm/unaligned.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include "ufs.h"
@@ -130,9 +134,8 @@ struct udevice *ufs_rpmb_get_scsi_dev(int dev_id)
 	return scsi_dev;
 }
 
-int ufs_rpmb_read_geometry(struct udevice *scsi_dev, u8 *rpmb_rw_size)
+static int ufs_rpmb_read_rw_size(struct ufs_hba *hba, u8 *rpmb_rw_size)
 {
-	struct ufs_hba *hba = dev_get_uclass_priv(scsi_dev->parent);
 	u8 desc[QUERY_DESC_GEOMETRY_DEF_SIZE];
 	int ret;
 
@@ -144,3 +147,131 @@ int ufs_rpmb_read_geometry(struct udevice *scsi_dev, u8 *rpmb_rw_size)
 	*rpmb_rw_size = desc[GEOMETRY_DESC_RPMB_RW_SIZE];
 	return 0;
 }
+
+static int ufs_rpmb_read_region_sizes(struct ufs_hba *hba, u16 spec_ver,
+				      u8 sizes[UFS_RPMB_NUM_REGIONS])
+{
+	u8 unit[QUERY_DESC_UNIT_DEF_SIZE] = { };
+	int ret;
+
+	ret = ufshcd_read_descriptor(hba, QUERY_DESC_IDN_UNIT,
+				     UFS_UPIU_RPMB_WLUN, unit, sizeof(unit));
+	if (ret)
+		return ret;
+
+	memset(sizes, 0, UFS_RPMB_NUM_REGIONS);
+
+	if (spec_ver > UFS_RPMB_LEGACY_SPEC_VER) {
+		sizes[0] = unit[RPMB_UNIT_DESC_REGION0_SIZE];
+		sizes[1] = unit[RPMB_UNIT_DESC_REGION1_SIZE];
+		sizes[2] = unit[RPMB_UNIT_DESC_REGION2_SIZE];
+		sizes[3] = unit[RPMB_UNIT_DESC_REGION3_SIZE];
+	} else {
+		u64 region = (get_unaligned_be64(unit +
+					RPMB_UNIT_DESC_LOGICAL_BLK_COUNT)
+			      << unit[RPMB_UNIT_DESC_LOGICAL_BLK_SIZE])
+			     >> UFS_RPMB_REGION_UNIT_SHIFT;
+
+		sizes[0] = region > 0xff ? 0xff : region;
+	}
+
+	return 0;
+}
+
+static void ufs_rpmb_string_to_ascii(const u8 *raw, char *out, size_t outsz)
+{
+	int nchars = ((int)raw[QUERY_DESC_LENGTH_OFFSET] - QUERY_DESC_HDR_SIZE);
+	int i, n = 0;
+
+	nchars = nchars > 0 ? nchars / 2 : 0;
+	for (i = 0; i < nchars && n < (int)outsz - 1; i++) {
+		u16 c = get_unaligned_be16(raw + QUERY_DESC_HDR_SIZE + i * 2);
+
+		out[n++] = (c >= 0x20 && c <= 0x7e) ? (char)c : ' ';
+	}
+	out[n] = '\0';
+}
+
+static int ufs_rpmb_build_cid(struct ufs_hba *hba, const u8 *dev_desc,
+			      unsigned int region, u8 *cid)
+{
+	u8 raw[QUERY_DESC_MAX_SIZE];
+	char model[MAX_MODEL_LEN * 8];
+	char serial_hex[QUERY_DESC_MAX_SIZE * 2 + 1];
+	char idstr[QUERY_DESC_MAX_SIZE * 3];
+	u8 serial[QUERY_DESC_MAX_SIZE] = { };
+	u16 manf_id, spec_ver, dev_ver, manf_date;
+	u8 blen;
+	int ret;
+
+	manf_id = get_unaligned_be16(dev_desc + DEVICE_DESC_PARAM_MANF_ID);
+	spec_ver = get_unaligned_be16(dev_desc + DEVICE_DESC_PARAM_SPEC_VER);
+	dev_ver = get_unaligned_be16(dev_desc + DEVICE_DESC_PARAM_DEV_VER);
+	manf_date = get_unaligned_be16(dev_desc + DEVICE_DESC_PARAM_MANF_DATE);
+
+	ret = ufshcd_read_descriptor(hba, QUERY_DESC_IDN_STRING,
+				     dev_desc[DEVICE_DESC_PARAM_PRDCT_NAME],
+				     raw, sizeof(raw));
+	if (ret)
+		return ret;
+	ufs_rpmb_string_to_ascii(raw, model, sizeof(model));
+
+	ret = ufshcd_read_descriptor(hba, QUERY_DESC_IDN_STRING,
+				     dev_desc[DEVICE_DESC_PARAM_SN],
+				     raw, sizeof(raw));
+	if (ret)
+		return ret;
+	blen = raw[QUERY_DESC_LENGTH_OFFSET];
+	if (blen < QUERY_DESC_HDR_SIZE)
+		return -EINVAL;
+	memcpy(serial, raw + QUERY_DESC_HDR_SIZE, blen - QUERY_DESC_HDR_SIZE);
+	bin2hex(serial_hex, serial, blen);
+	serial_hex[blen * 2] = '\0';
+
+	snprintf(idstr, sizeof(idstr), "%04X-%04X-%s-%s-%04X-%04X-R%u",
+		 manf_id, spec_ver, model, serial_hex, dev_ver, manf_date,
+		 region);
+
+	if (blake2b(cid, UFS_RPMB_CID_SIZE, idstr, strlen(idstr), NULL, 0))
+		return -EIO;
+
+	return 0;
+}
+
+int ufs_rpmb_get_region_info(struct udevice *scsi_dev, unsigned int region,
+			     u8 *size_mult, u8 *rel_wr, u8 *cid)
+{
+	struct ufs_hba *hba = dev_get_uclass_priv(scsi_dev->parent);
+	u8 dev_desc[QUERY_DESC_DEVICE_DEF_SIZE] = { };
+	u8 sizes[UFS_RPMB_NUM_REGIONS];
+	u16 spec_ver;
+	int ret;
+
+	if (region >= UFS_RPMB_NUM_REGIONS)
+		return 0;
+
+	ret = ufshcd_read_descriptor(hba, QUERY_DESC_IDN_DEVICE, 0,
+				     dev_desc, sizeof(dev_desc));
+	if (ret)
+		return ret;
+	spec_ver = get_unaligned_be16(dev_desc + DEVICE_DESC_PARAM_SPEC_VER);
+
+	ret = ufs_rpmb_read_region_sizes(hba, spec_ver, sizes);
+	if (ret)
+		return ret;
+	if (!sizes[region])
+		return 0;
+
+	ret = ufs_rpmb_read_rw_size(hba, rel_wr);
+	if (ret)
+		return ret;
+	if (!*rel_wr)
+		*rel_wr = 1;
+
+	ret = ufs_rpmb_build_cid(hba, dev_desc, region, cid);
+	if (ret)
+		return ret;
+
+	*size_mult = sizes[region];
+	return 1;
+}
diff --git a/drivers/ufs/ufs-uclass.c b/drivers/ufs/ufs-uclass.c
index 962b6093762..f5e5bfd2e27 100644
--- a/drivers/ufs/ufs-uclass.c
+++ b/drivers/ufs/ufs-uclass.c
@@ -1800,8 +1800,8 @@ out:
 	return err;
 }
 
-static int ufs_get_device_desc(struct ufs_hba *hba,
-			       struct ufs_dev_desc *dev_desc)
+int ufs_get_device_desc(struct ufs_hba *hba,
+			struct ufs_dev_desc *dev_desc)
 {
 	int err;
 	size_t buff_len;
diff --git a/drivers/ufs/ufs.h b/drivers/ufs/ufs.h
index e66d2c5f533..cf89bbc2008 100644
--- a/drivers/ufs/ufs.h
+++ b/drivers/ufs/ufs.h
@@ -20,6 +20,15 @@ struct udevice;
 #define UFS_RPMB_SEC_PROTOCOL_ID	0x01
 
 #define GEOMETRY_DESC_RPMB_RW_SIZE	0x17
+
+#define RPMB_UNIT_DESC_LOGICAL_BLK_SIZE		0x0A
+#define RPMB_UNIT_DESC_LOGICAL_BLK_COUNT	0x0B
+#define RPMB_UNIT_DESC_REGION0_SIZE		0x13
+#define RPMB_UNIT_DESC_REGION1_SIZE		0x14
+#define RPMB_UNIT_DESC_REGION2_SIZE		0x15
+#define RPMB_UNIT_DESC_REGION3_SIZE		0x16
+#define UFS_RPMB_LEGACY_SPEC_VER		0x0220
+#define UFS_RPMB_REGION_UNIT_SHIFT		17
 #define UPIU_TRANSACTION_UIC_CMD 0x1F
 #define UIC_CMD_SIZE (sizeof(u32) * 4)
 #define RESPONSE_UPIU_SENSE_DATA_LENGTH	18
@@ -822,4 +831,6 @@ int ufshcd_probe(struct udevice *dev, struct ufs_hba_ops *hba_ops);
 int ufshcd_read_descriptor(struct ufs_hba *hba, enum desc_idn desc_id,
 			   int desc_index, u8 *buf, u8 size);
 
+int ufs_get_device_desc(struct ufs_hba *hba, struct ufs_dev_desc *dev_desc);
+
 #endif
diff --git a/include/ufs.h b/include/ufs.h
index 90c6aebcec1..79573e02278 100644
--- a/include/ufs.h
+++ b/include/ufs.h
@@ -20,12 +20,16 @@ int ufs_probe(void);
  */
 int ufs_probe_dev(int index);
 
+#define UFS_RPMB_CID_SIZE	16
+#define UFS_RPMB_NUM_REGIONS	4
+
 struct udevice *ufs_rpmb_get_scsi_dev(int dev_id);
 
 int ufs_rpmb_route_frames(struct udevice *scsi_dev, unsigned int region,
 			  void *req, unsigned long reqlen, void *rsp,
 			  unsigned long rsplen);
 
-int ufs_rpmb_read_geometry(struct udevice *scsi_dev, u8 *rpmb_rw_size);
+int ufs_rpmb_get_region_info(struct udevice *scsi_dev, unsigned int region,
+			     u8 *size_mult, u8 *rel_wr, u8 *cid);
 
 #endif
-- 
2.54.0