habanalabs: expose only valid debugfs nodes

In case security is enabled on the device, some debugfs nodes will
fail. Hence, we do not expose them.
Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

Documentation/ABI/testing/debugfs-driver-habanalabs

@@ -130,14 +130,16 @@ Date:           Jan 2019
 KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
 Description:    Sets I2C device address for I2C transaction that is generated
-                by the device's CPU
+                by the device's CPU, Not available when device is loaded with secured
+                firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/i2c_bus
 Date:           Jan 2019
 KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
 Description:    Sets I2C bus address for I2C transaction that is generated by
-                the device's CPU
+                the device's CPU, Not available when device is loaded with secured
+                firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/i2c_data
 Date:           Jan 2019
@@ -145,39 +147,45 @@ KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
 Description:    Triggers an I2C transaction that is generated by the device's
                 CPU. Writing to this file generates a write transaction while
-                reading from the file generates a read transaction
+                reading from the file generates a read transaction, Not available
+                when device is loaded with secured firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/i2c_len
 Date:           Dec 2021
 KernelVersion:  5.17
 Contact:        obitton@habana.ai
 Description:    Sets I2C length in bytes for I2C transaction that is generated by
-                the device's CPU
+                the device's CPU, Not available when device is loaded with secured
+                firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/i2c_reg
 Date:           Jan 2019
 KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
 Description:    Sets I2C register id for I2C transaction that is generated by
-                the device's CPU
+                the device's CPU, Not available when device is loaded with secured
+                firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/led0
 Date:           Jan 2019
 KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
-Description:    Sets the state of the first S/W led on the device
+Description:    Sets the state of the first S/W led on the device, Not available
+                when device is loaded with secured firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/led1
 Date:           Jan 2019
 KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
-Description:    Sets the state of the second S/W led on the device
+Description:    Sets the state of the second S/W led on the device, Not available
+                when device is loaded with secured firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/led2
 Date:           Jan 2019
 KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
-Description:    Sets the state of the third S/W led on the device
+Description:    Sets the state of the third S/W led on the device, Not available
+                when device is loaded with secured firmware
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/memory_scrub
 Date:           May 2022

drivers/misc/habanalabs/common/debugfs.c

@@ -1562,6 +1562,53 @@ static const struct file_operations hl_debugfs_fops = {
 	.release = single_release,
 };
 
+static void add_secured_nodes(struct hl_dbg_device_entry *dev_entry)
+{
+	debugfs_create_u8("i2c_bus",
+				0644,
+				dev_entry->root,
+				&dev_entry->i2c_bus);
+
+	debugfs_create_u8("i2c_addr",
+				0644,
+				dev_entry->root,
+				&dev_entry->i2c_addr);
+
+	debugfs_create_u8("i2c_reg",
+				0644,
+				dev_entry->root,
+				&dev_entry->i2c_reg);
+
+	debugfs_create_u8("i2c_len",
+				0644,
+				dev_entry->root,
+				&dev_entry->i2c_len);
+
+	debugfs_create_file("i2c_data",
+				0644,
+				dev_entry->root,
+				dev_entry,
+				&hl_i2c_data_fops);
+
+	debugfs_create_file("led0",
+				0200,
+				dev_entry->root,
+				dev_entry,
+				&hl_led0_fops);
+
+	debugfs_create_file("led1",
+				0200,
+				dev_entry->root,
+				dev_entry,
+				&hl_led1_fops);
+
+	debugfs_create_file("led2",
+				0200,
+				dev_entry->root,
+				dev_entry,
+				&hl_led2_fops);
+}
+
 void hl_debugfs_add_device(struct hl_device *hdev)
 {
 	struct hl_dbg_device_entry *dev_entry = &hdev->hl_debugfs;
@@ -1632,50 +1679,6 @@ void hl_debugfs_add_device(struct hl_device *hdev)
 				dev_entry,
 				&hl_power_fops);
 
-	debugfs_create_u8("i2c_bus",
-				0644,
-				dev_entry->root,
-				&dev_entry->i2c_bus);
-
-	debugfs_create_u8("i2c_addr",
-				0644,
-				dev_entry->root,
-				&dev_entry->i2c_addr);
-
-	debugfs_create_u8("i2c_reg",
-				0644,
-				dev_entry->root,
-				&dev_entry->i2c_reg);
-
-	debugfs_create_u8("i2c_len",
-				0644,
-				dev_entry->root,
-				&dev_entry->i2c_len);
-
-	debugfs_create_file("i2c_data",
-				0644,
-				dev_entry->root,
-				dev_entry,
-				&hl_i2c_data_fops);
-
-	debugfs_create_file("led0",
-				0200,
-				dev_entry->root,
-				dev_entry,
-				&hl_led0_fops);
-
-	debugfs_create_file("led1",
-				0200,
-				dev_entry->root,
-				dev_entry,
-				&hl_led1_fops);
-
-	debugfs_create_file("led2",
-				0200,
-				dev_entry->root,
-				dev_entry,
-				&hl_led2_fops);
-
 	debugfs_create_file("device",
 				0200,
 				dev_entry->root,
@@ -1754,6 +1757,9 @@ void hl_debugfs_add_device(struct hl_device *hdev)
 		entry->info_ent = &hl_debugfs_list[i];
 		entry->dev_entry = dev_entry;
 	}
+
+	if (!hdev->asic_prop.fw_security_enabled)
+		add_secured_nodes(dev_entry);
 }
 
 void hl_debugfs_remove_device(struct hl_device *hdev)