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From:   shiva.linuxworks@gmail.com
To:     tudor.ambarus@microchip.com, michael@walle.cc, p.yadav@ti.com,
        miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com
Cc:     linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
        Shivamurthy Shastri <sshivamurthy@micron.com>
Subject: [PATCH 3/4] mtd: add advanced protection and security ioctls
Date:   Wed, 27 Oct 2021 10:33:51 +0000
Message-Id: <20211027103352.8879-4-sshivamurthy@micron.com>
In-Reply-To: <20211027103352.8879-1-sshivamurthy@micron.com>
References: <20211027103352.8879-1-sshivamurthy@micron.com>
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From: Shivamurthy Shastri <sshivamurthy@micron.com>

Added new ioctls for advanced protection and security features.
These features are currently supported by new Micron SPI NOR flashes.

Signed-off-by: Shivamurthy Shastri <sshivamurthy@micron.com>
---
 drivers/mtd/mtdchar.c      | 145 +++++++++++++++++++++++++++++++++++++
 include/uapi/mtd/mtd-abi.h |  11 +++
 2 files changed, 156 insertions(+)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 155e991d9d75..97b97b80276d 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -654,6 +654,16 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 	case MTDFILEMODE:
 	case BLKPG:
 	case BLKRRPART:
+	case SECURE_PACKET_READ:
+	case SECURE_PACKET_WRITE:
+	case RD_VLOCK_BITS:
+	case WR_VLOCK_BITS:
+	case RD_NVLOCK_BITS:
+	case WR_NVLOCK_BITS:
+	case ER_NVLOCK_BITS:
+	case RD_GLOBAL_FREEZE_BITS:
+	case WR_GLOBAL_FREEZE_BITS:
+	case RD_PASSWORD:
 		break;
 
 	/* "dangerous" commands */
@@ -1017,6 +1027,141 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		ret = 0;
 		break;
 	}
+	case SECURE_PACKET_READ:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = kmalloc(buf.length, GFP_KERNEL);
+		ret = master->_secure_packet_read(master, buf.length, oobbuf);
+		if (copy_to_user(buf.ptr, oobbuf, buf.length))
+			ret = -EFAULT;
+		break;
+	}
+
+	case SECURE_PACKET_WRITE:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = memdup_user(buf.ptr, buf.length);
+		ret = master->_secure_packet_write(master, buf.length, oobbuf);
+		break;
+	}
+
+	case RD_VLOCK_BITS:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = kmalloc(buf.length, GFP_KERNEL);
+		ret = master->_read_vlock_bits(master, buf.start, buf.length,
+					       oobbuf);
+		if (copy_to_user(buf.ptr, oobbuf, buf.length))
+			ret = -EFAULT;
+		break;
+	}
+
+	case WR_VLOCK_BITS:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = memdup_user(buf.ptr, buf.length);
+		ret = master->_write_vlock_bits(master, buf. start, buf.length,
+						oobbuf);
+		break;
+	}
+
+	case RD_NVLOCK_BITS:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = kmalloc(buf.length, GFP_KERNEL);
+		ret = master->_read_nvlock_bits(master, buf.start, buf.length,
+						oobbuf);
+		if (copy_to_user(buf.ptr, oobbuf, buf.length))
+			ret = -EFAULT;
+		break;
+	}
+
+	case WR_NVLOCK_BITS:
+	{
+		struct mtd_oob_buf buf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		ret = master->_write_nvlock_bits(master, buf.start);
+		break;
+	}
+
+	case ER_NVLOCK_BITS:
+	{
+		ret = master->_erase_nvlock_bits(master);
+		break;
+	}
+
+	case RD_GLOBAL_FREEZE_BITS:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = kmalloc(buf.length, GFP_KERNEL);
+		ret = master->_read_global_freeze_bits(master, buf.length,
+						       oobbuf);
+		if (copy_to_user(buf.ptr, oobbuf, buf.length))
+			ret = -EFAULT;
+		break;
+	}
+
+	case WR_GLOBAL_FREEZE_BITS:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = memdup_user(buf.ptr, buf.length);
+		ret = master->_write_global_freeze_bits(master, buf.length,
+							oobbuf);
+		break;
+	}
+
+	case RD_PASSWORD:
+	{
+		struct mtd_oob_buf buf;
+		u8 *oobbuf;
+
+		if (copy_from_user(&buf, argp, sizeof(buf)))
+			ret = -EFAULT;
+
+		oobbuf = kmalloc(buf.length, GFP_KERNEL);
+		ret = master->_read_password(master, buf.length, oobbuf);
+		if (copy_to_user(buf.ptr, oobbuf, buf.length))
+			ret = -EFAULT;
+		break;
+	}
 	}
 
 	return ret;
diff --git a/include/uapi/mtd/mtd-abi.h b/include/uapi/mtd/mtd-abi.h
index b869990c2db2..dbd7bf60d484 100644
--- a/include/uapi/mtd/mtd-abi.h
+++ b/include/uapi/mtd/mtd-abi.h
@@ -208,6 +208,17 @@ struct otp_info {
 /* Erase a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
 #define OTPERASE		_IOW('M', 25, struct otp_info)
 
+#define SECURE_PACKET_READ	_IOWR('M', 26, struct mtd_oob_buf)
+#define SECURE_PACKET_WRITE	_IOWR('M', 27, struct mtd_oob_buf)
+#define RD_VLOCK_BITS		_IOWR('M', 28, struct mtd_oob_buf)
+#define WR_VLOCK_BITS		_IOWR('M', 29, struct mtd_oob_buf)
+#define RD_NVLOCK_BITS		_IOWR('M', 30, struct mtd_oob_buf)
+#define WR_NVLOCK_BITS		_IOWR('M', 31, struct mtd_oob_buf)
+#define ER_NVLOCK_BITS		_IO('M', 32)
+#define RD_GLOBAL_FREEZE_BITS	_IOWR('M', 33, struct mtd_oob_buf)
+#define WR_GLOBAL_FREEZE_BITS	_IOWR('M', 34, struct mtd_oob_buf)
+#define RD_PASSWORD		_IOWR('M', 35, struct mtd_oob_buf)
+
 /*
  * Obsolete legacy interface. Keep it in order not to break userspace
  * interfaces
-- 
2.25.1