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From:   Chetan C R <quic_cchinnad@quicinc.com>
To:     <bvanassche@acm.org>
CC:     <jejb@linux.ibm.com>, <linux-kernel@vger.kernel.org>,
        <linux-scsi@vger.kernel.org>,
        Chetan C R <quic_cchinnad@quicinc.com>
Subject: [PATCH V2] scsi: ufs: Get boot device storage type from command line
Date:   Thu, 28 Jul 2022 23:00:42 +0530
Message-ID: <1659029442-19135-2-git-send-email-quic_cchinnad@quicinc.com>
In-Reply-To: <1659029442-19135-1-git-send-email-quic_cchinnad@quicinc.com>
References: <1659029442-19135-1-git-send-email-quic_cchinnad@quicinc.com>
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Get the boot device storage type by reading it from
kernel command line arguments and export the same
information to ufs modules.

Signed-off-by: Chetan C R <quic_cchinnad@quicinc.com>
---
 drivers/ufs/host/Kconfig       | 10 ++++++++
 drivers/ufs/host/Makefile      |  1 +
 drivers/ufs/host/ufs-cmdline.c | 54 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 65 insertions(+)
 create mode 100644 drivers/ufs/host/ufs-cmdline.c

diff --git a/drivers/ufs/host/Kconfig b/drivers/ufs/host/Kconfig
index 8259022..02fe817 100644
--- a/drivers/ufs/host/Kconfig
+++ b/drivers/ufs/host/Kconfig
@@ -68,6 +68,16 @@ config SCSI_UFS_QCOM
 	  Select this if you have UFS controller on QCOM chipset.
 	  If unsure, say N.
 
+config UFS_QCOM_CMDLINE
+	bool "Get the boot device type from kernel command line for Qcom devices"
+	default y if ARCH_QCOM
+	help
+	  This selects the support of getting the boot device storage type
+	  from kernel command line arguments and export this information
+	  to the Qcom UFS controller platform driver.
+
+	  If unsure, say N.
+
 config SCSI_UFS_MEDIATEK
 	tristate "Mediatek specific hooks to UFS controller platform driver"
 	depends on SCSI_UFSHCD_PLATFORM && ARCH_MEDIATEK
diff --git a/drivers/ufs/host/Makefile b/drivers/ufs/host/Makefile
index e4be542..a9463f1 100644
--- a/drivers/ufs/host/Makefile
+++ b/drivers/ufs/host/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_SCSI_UFS_CDNS_PLATFORM) += cdns-pltfrm.o
 obj-$(CONFIG_SCSI_UFS_QCOM) += ufs_qcom.o
 ufs_qcom-y += ufs-qcom.o
 ufs_qcom-$(CONFIG_SCSI_UFS_CRYPTO) += ufs-qcom-ice.o
+obj-$(CONFIG_UFS_QCOM_CMDLINE)          += ufs-cmdline.o
 obj-$(CONFIG_SCSI_UFS_EXYNOS) += ufs-exynos.o
 obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
 obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
diff --git a/drivers/ufs/host/ufs-cmdline.c b/drivers/ufs/host/ufs-cmdline.c
new file mode 100644
index 0000000..408755c
--- /dev/null
+++ b/drivers/ufs/host/ufs-cmdline.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/init.h>
+#include <linux/printk.h>
+#include <linux/string.h>
+
+#ifdef CONFIG_BOOT_CONFIG
+#include <linux/bootconfig.h>
+#endif
+
+#define ANDROID_BOOT_DEV_MAX_V3    30
+
+static char android_boot_dev_v3[ANDROID_BOOT_DEV_MAX_V3];
+static const char *android_boot_dev_v4;
+
+const char *get_storage_boot_device(void)
+{
+	if (android_boot_dev_v4 && strlen(android_boot_dev_v4))
+		return android_boot_dev_v4;
+
+	else if (strlen(android_boot_dev_v3))
+		return android_boot_dev_v3;
+
+	pr_err("Not able to get Bootconfig or Kernel command line param\n");
+	return NULL;
+};
+EXPORT_SYMBOL_GPL(get_storage_boot_device);
+
+/* boot image header version 3 android boot device type */
+static int __init get_android_boot_dev_v3(char *str)
+{
+	strscpy(android_boot_dev_v3, str, ANDROID_BOOT_DEV_MAX_V3);
+	return 1;
+}
+__setup("androidboot.bootdevice=", get_android_boot_dev_v3);
+
+#ifdef CONFIG_BOOT_CONFIG
+/* boot image header version 4 android boot device type */
+static int __init get_android_boot_dev_v4(void)
+{
+	struct xbc_node *vnode = NULL;
+
+	android_boot_dev_v4 = xbc_find_value("androidboot.bootdevice", &vnode);
+
+	if (vnode && xbc_node_is_array(vnode))
+		xbc_array_for_each_value(vnode, android_boot_dev_v4);
+
+	return 0;
+}
+fs_initcall(get_android_boot_dev_v4);
+#endif
-- 
2.7.4