linux-kernel - [PATCH V2] scsi: ufs: Get boot device storage type from command line

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Date:   Thu, 28 Jul 2022 23:00:42 +0530
From:   Chetan C R <quic_cchinnad@...cinc.com>
To:     <bvanassche@....org>
CC:     <jejb@...ux.ibm.com>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>,
        Chetan C R <quic_cchinnad@...cinc.com>
Subject: [PATCH V2] scsi: ufs: Get boot device storage type from command line

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@...cinc.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