[v4,15/18] tools/testing/cxl: add mechanism to lock mem device for testing

Commit Message

Dave Jiang Nov. 14, 2022, 8:34 p.m. UTC

The mock cxl mem devs needs a way to go into "locked" status to simulate
when the platform is rebooted. Add a sysfs mechanism so the device security
state is set to "locked" and the frozen state bits are cleared.

Reviewed-by: Jonathan Cameron <[e-mail]>
Signed-off-by: Dave Jiang <[e-mail]>
---
 tools/testing/cxl/test/cxl.c |   40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

Patch

diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index 6dd286a52839..7384573e8b12 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -628,6 +628,45 @@  static void mock_companion(struct acpi_device *adev, struct device *dev)
 #define SZ_512G (SZ_64G * 8)
 #endif
 
+static ssize_t security_lock_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct cxl_mock_mem_pdata *mdata = dev_get_platdata(dev);
+
+	return sysfs_emit(buf, "%u\n",
+			  !!(mdata->security_state & CXL_PMEM_SEC_STATE_LOCKED));
+}
+
+static ssize_t security_lock_store(struct device *dev, struct device_attribute *attr,
+				   const char *buf, size_t count)
+{
+	struct cxl_mock_mem_pdata *mdata = dev_get_platdata(dev);
+	u32 mask = CXL_PMEM_SEC_STATE_FROZEN | CXL_PMEM_SEC_STATE_USER_PLIMIT |
+		   CXL_PMEM_SEC_STATE_MASTER_PLIMIT;
+	int val;
+
+	if (kstrtoint(buf, 0, &val) < 0)
+		return -EINVAL;
+
+	if (val == 1) {
+		if (!(mdata->security_state & CXL_PMEM_SEC_STATE_USER_PASS_SET))
+			return -ENXIO;
+		mdata->security_state |= CXL_PMEM_SEC_STATE_LOCKED;
+		mdata->security_state &= ~mask;
+	} else {
+		return -EINVAL;
+	}
+	return count;
+}
+
+static DEVICE_ATTR_RW(security_lock);
+
+static struct attribute *cxl_mock_mem_attrs[] = {
+	&dev_attr_security_lock.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(cxl_mock_mem);
+
 static __init int cxl_test_init(void)
 {
 	struct cxl_mock_mem_pdata *mem_pdata;
@@ -752,6 +791,7 @@  static __init int cxl_test_init(void)
 			goto err_mem;
 		}
 
+		pdev->dev.groups = cxl_mock_mem_groups;
 		rc = platform_device_add(pdev);
 		if (rc) {
 			platform_device_put(pdev);