tools/testing/cxl: Add "Disable" security opcode support

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.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166983612447.2734609.2767804273351656413.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
index 33ae795..77774a9 100644 (file)
--- a/tools/testing/cxl/test/mem.c
+++ b/tools/testing/cxl/test/mem.c
@@ -243,6 +243,77 @@ static int mock_set_passphrase(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd
        return -EINVAL;
 }
 
+static int mock_disable_passphrase(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
+{
+       struct cxl_mock_mem_pdata *mdata = dev_get_platdata(cxlds->dev);
+       struct cxl_disable_pass *dis_pass;
+
+       if (cmd->size_in != sizeof(*dis_pass))
+               return -EINVAL;
+
+       if (cmd->size_out != 0)
+               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)) {
+                       master_plimit_check(mdata);
+                       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;
+               return 0;
+
+       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)) {
+                       user_plimit_check(mdata);
+                       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);
+               return 0;
+
+       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;
@@ -344,6 +415,9 @@ 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;
        }