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From:   Asmaa Mnebhi <asmaa@nvidia.com>
To:     <markgross@kernel.org>, <vadimp@nvidia.com>, <hdegoede@redhat.com>,
        <linux-kernel@vger.kernel.org>
CC:     Asmaa Mnebhi <asmaa@nvidia.com>
Subject: [PATCH v1 2/2] mlxbf-bootctl: Support setting the ARM boot state to "OS up"
Date:   Wed, 9 Aug 2023 10:15:13 -0400
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The BlueField has internal registers to store the ARM boot states.
Support setting the BlueField ARM boot state to "OS up".

Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
---
 drivers/platform/mellanox/mlxbf-bootctl.c | 25 +++++++++++++++++++++++
 drivers/platform/mellanox/mlxbf-bootctl.h |  5 +++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/platform/mellanox/mlxbf-bootctl.c b/drivers/platform/mellanox/mlxbf-bootctl.c
index 3ea11250b681..7a67fcc6dd98 100644
--- a/drivers/platform/mellanox/mlxbf-bootctl.c
+++ b/drivers/platform/mellanox/mlxbf-bootctl.c
@@ -80,6 +80,7 @@ static const char * const mlxbf_rsh_log_level[] = {
 	"INFO", "WARN", "ERR", "ASSERT"};
 
 static DEFINE_MUTEX(icm_ops_lock);
+static DEFINE_MUTEX(os_up_lock);
 
 /* ARM SMC call which is atomic and no need for lock. */
 static int mlxbf_bootctl_smc(unsigned int smc_op, int smc_arg)
@@ -431,6 +432,28 @@ static ssize_t large_icm_store(struct device *dev,
 	return res.a0 ? -EPERM : count;
 }
 
+static ssize_t os_up_store(struct device *dev,
+			   struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct arm_smccc_res res;
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 10, &val);
+	if (err)
+		return err;
+
+	if (val != 1)
+		return -EINVAL;
+
+	mutex_lock(&os_up_lock);
+	arm_smccc_smc(MLNX_HANDLE_OS_UP, 0, 0, 0, 0, 0, 0, 0, &res);
+	mutex_unlock(&os_up_lock);
+
+	return count;
+}
+
 static DEVICE_ATTR_RW(post_reset_wdog);
 static DEVICE_ATTR_RW(reset_action);
 static DEVICE_ATTR_RW(second_reset_action);
@@ -439,6 +462,7 @@ static DEVICE_ATTR_RO(secure_boot_fuse_state);
 static DEVICE_ATTR_WO(fw_reset);
 static DEVICE_ATTR_WO(rsh_log);
 static DEVICE_ATTR_RW(large_icm);
+static DEVICE_ATTR_WO(os_up);
 
 static struct attribute *mlxbf_bootctl_attrs[] = {
 	&dev_attr_post_reset_wdog.attr,
@@ -449,6 +473,7 @@ static struct attribute *mlxbf_bootctl_attrs[] = {
 	&dev_attr_fw_reset.attr,
 	&dev_attr_rsh_log.attr,
 	&dev_attr_large_icm.attr,
+	&dev_attr_os_up.attr,
 	NULL
 };
 
diff --git a/drivers/platform/mellanox/mlxbf-bootctl.h b/drivers/platform/mellanox/mlxbf-bootctl.h
index 75d59ade92be..19142cc71312 100644
--- a/drivers/platform/mellanox/mlxbf-bootctl.h
+++ b/drivers/platform/mellanox/mlxbf-bootctl.h
@@ -90,6 +90,11 @@
 
 #define MAX_ICM_BUFFER_SIZE 10
 
+/*
+ * SMC function ID to set the ARM boot state to up
+ */
+#define MLNX_HANDLE_OS_UP    0x82000014
+
 /* SMC function IDs for SiP Service queries */
 #define MLXBF_BOOTCTL_SIP_SVC_CALL_COUNT	0x8200ff00
 #define MLXBF_BOOTCTL_SIP_SVC_UID		0x8200ff01
-- 
2.30.1