habanalabs: expose device security status through sysfs

In order for the user to know if he is running on a secured device
or not, a sysfs node is added.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-driver-habanalabs b/Documentation/ABI/testing/sysfs-driver-habanalabs
index 96646fb2e7a1df7b3e2684784955ae238d65282b..6963640a2615c551651571c86b2fefd2380a72e2 100644 (file)
--- a/Documentation/ABI/testing/sysfs-driver-habanalabs
+++ b/Documentation/ABI/testing/sysfs-driver-habanalabs
@@ -176,6 +176,12 @@ KernelVersion:  5.1
 Contact:        ogabbay@kernel.org
 Description:    Version of the device's preboot F/W code
 
+What:           /sys/class/habanalabs/hl<n>/security_enabled
+Date:           Oct 2022
+KernelVersion:  6.1
+Contact:        obitton@habana.ai
+Description:    Displays the device's security status
+
 What:           /sys/class/habanalabs/hl<n>/soft_reset
 Date:           Jan 2019
 KernelVersion:  5.1

diff --git a/drivers/misc/habanalabs/common/sysfs.c b/drivers/misc/habanalabs/common/sysfs.c
index 6c5271f01160c78062c0acb9ec817dc8be8af6e9..36e9814139d172c8faa35c099445d8c454d70c4b 100644 (file)
--- a/drivers/misc/habanalabs/common/sysfs.c
+++ b/drivers/misc/habanalabs/common/sysfs.c
@@ -375,6 +375,14 @@ out:
        return max_size;
 }
 
+static ssize_t security_enabled_show(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       struct hl_device *hdev = dev_get_drvdata(dev);
+
+       return sprintf(buf, "%d\n", hdev->asic_prop.fw_security_enabled);
+}
+
 static DEVICE_ATTR_RO(armcp_kernel_ver);
 static DEVICE_ATTR_RO(armcp_ver);
 static DEVICE_ATTR_RO(cpld_ver);
@@ -393,6 +401,7 @@ static DEVICE_ATTR_RO(status);
 static DEVICE_ATTR_RO(thermal_ver);
 static DEVICE_ATTR_RO(uboot_ver);
 static DEVICE_ATTR_RO(fw_os_ver);
+static DEVICE_ATTR_RO(security_enabled);
 
 static struct bin_attribute bin_attr_eeprom = {
        .attr = {.name = "eeprom", .mode = (0444)},
@@ -417,6 +426,7 @@ static struct attribute *hl_dev_attrs[] = {
        &dev_attr_thermal_ver.attr,
        &dev_attr_uboot_ver.attr,
        &dev_attr_fw_os_ver.attr,
+       &dev_attr_security_enabled.attr,
        NULL,
 };