[PATCH RFC 07/15] tools/testing/cxl: Add "Disable" security opcode support

[Dave Jiang <dave.jiang@intel.com>]

Add support to emulate a CXL mem device support the "Disable Passphrase"
operation. The operation supports disabling of either a user or a master
passphrase. The emulation will provide support for both user and master
passphrase.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 tools/testing/cxl/test/mem.c |   80 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index 796f4f7b5e3d..5f87a94d92ae 100644
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -235,6 +235,83 @@ static int mock_set_passphrase(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd
 	return 0;
 }
 
+static int mock_disable_passphrase(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
+{
+	struct mock_mdev_data *mdata = dev_get_drvdata(cxlds->dev);
+	struct cxl_disable_pass *dis_pass;
+
+	if (cmd->size_in != sizeof(*dis_pass)) {
+		cmd->return_code = CXL_MBOX_CMD_RC_INPUT;
+		return -EINVAL;
+	}
+
+	if (cmd->size_out != 0) {
+		cmd->return_code = CXL_MBOX_CMD_RC_INPUT;
+		return -EINVAL;
+	}
+
+	if (mdata->security_state & CXL_PMEM_SEC_STATE_FROZEN) {
+		cmd->return_code = CXL_MBOX_CMD_RC_SECURITY;
+		return -ENXIO;
+	}
+
+	dis_pass = cmd->payload_in;
+	switch (dis_pass->type) {
+	case CXL_PMEM_SEC_PASS_MASTER:
+		if (mdata->security_state & CXL_PMEM_SEC_STATE_MASTER_PLIMIT) {
+			cmd->return_code = CXL_MBOX_CMD_RC_SECURITY;
+			return -ENXIO;
+		}
+
+		if (!(mdata->security_state & CXL_PMEM_SEC_STATE_MASTER_PASS_SET)) {
+			cmd->return_code = CXL_MBOX_CMD_RC_SECURITY;
+			return -ENXIO;
+		}
+
+		if (memcmp(dis_pass->pass, mdata->master_pass, NVDIMM_PASSPHRASE_LEN)) {
+			if (++mdata->master_limit == PASS_TRY_LIMIT)
+				mdata->security_state |= CXL_PMEM_SEC_STATE_MASTER_PLIMIT;
+			cmd->return_code = CXL_MBOX_CMD_RC_PASSPHRASE;
+			return -ENXIO;
+		}
+
+		mdata->master_limit = 0;
+		memset(mdata->master_pass, 0, NVDIMM_PASSPHRASE_LEN);
+		mdata->security_state &= ~CXL_PMEM_SEC_STATE_MASTER_PASS_SET;
+		break;
+
+	case CXL_PMEM_SEC_PASS_USER:
+		if (mdata->security_state & CXL_PMEM_SEC_STATE_USER_PLIMIT) {
+			cmd->return_code = CXL_MBOX_CMD_RC_SECURITY;
+			return -ENXIO;
+		}
+
+		if (!(mdata->security_state & CXL_PMEM_SEC_STATE_USER_PASS_SET)) {
+			cmd->return_code = CXL_MBOX_CMD_RC_SECURITY;
+			return -ENXIO;
+		}
+
+		if (memcmp(dis_pass->pass, mdata->user_pass, NVDIMM_PASSPHRASE_LEN)) {
+			if (++mdata->user_limit == PASS_TRY_LIMIT)
+				mdata->security_state |= CXL_PMEM_SEC_STATE_USER_PLIMIT;
+			cmd->return_code = CXL_MBOX_CMD_RC_PASSPHRASE;
+			return -ENXIO;
+		}
+
+		mdata->user_limit = 0;
+		memset(mdata->user_pass, 0, NVDIMM_PASSPHRASE_LEN);
+		mdata->security_state &= ~(CXL_PMEM_SEC_STATE_USER_PASS_SET |
+					   CXL_PMEM_SEC_STATE_LOCKED);
+		break;
+
+	default:
+		cmd->return_code = CXL_MBOX_CMD_RC_INPUT;
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int mock_get_lsa(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
 {
 	struct cxl_mbox_get_lsa *get_lsa = cmd->payload_in;
@@ -333,6 +410,9 @@ static int cxl_mock_mbox_send(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *
 	case CXL_MBOX_OP_SET_PASSPHRASE:
 		rc = mock_set_passphrase(cxlds, cmd);
 		break;
+	case CXL_MBOX_OP_DISABLE_PASSPHRASE:
+		rc = mock_disable_passphrase(cxlds, cmd);
+		break;
 	default:
 		break;
 	}