hw/cxl/mbox: Add Get Background Operation Status Command

For now, provide this command on type 3 main mailbox only.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20231023160806.13206-15-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/cxl/cxl-mailbox-utils.c

@@ -50,6 +50,7 @@
 enum {
     INFOSTAT    = 0x00,
         #define IS_IDENTIFY   0x1
+        #define BACKGROUND_OPERATION_STATUS    0x2
     EVENTS      = 0x01,
         #define GET_RECORDS   0x0
         #define CLEAR_RECORDS   0x1
@@ -452,6 +453,36 @@ static CXLRetCode cmd_get_physical_port_state(const struct cxl_cmd *cmd,
     return CXL_MBOX_SUCCESS;
 }
 
+/* CXL r3.0 8.2.9.1.2 */
+static CXLRetCode cmd_infostat_bg_op_sts(const struct cxl_cmd *cmd,
+                                         uint8_t *payload_in,
+                                         size_t len_in,
+                                         uint8_t *payload_out,
+                                         size_t *len_out,
+                                         CXLCCI *cci)
+{
+    struct {
+        uint8_t status;
+        uint8_t rsvd;
+        uint16_t opcode;
+        uint16_t returncode;
+        uint16_t vendor_ext_status;
+    } QEMU_PACKED *bg_op_status;
+    QEMU_BUILD_BUG_ON(sizeof(*bg_op_status) != 8);
+
+    bg_op_status = (void *)payload_out;
+    memset(bg_op_status, 0, sizeof(*bg_op_status));
+    bg_op_status->status = cci->bg.complete_pct << 1;
+    if (cci->bg.runtime > 0) {
+        bg_op_status->status |= 1U << 0;
+    }
+    bg_op_status->opcode = cci->bg.opcode;
+    bg_op_status->returncode = cci->bg.ret_code;
+    *len_out = sizeof(*bg_op_status);
+
+    return CXL_MBOX_SUCCESS;
+}
+
 /* 8.2.9.2.1 */
 static CXLRetCode cmd_firmware_update_get_info(const struct cxl_cmd *cmd,
                                                uint8_t *payload_in,
@@ -1111,6 +1142,8 @@ static const struct cxl_cmd cxl_cmd_set[256][256] = {
 
 static const struct cxl_cmd cxl_cmd_set_sw[256][256] = {
     [INFOSTAT][IS_IDENTIFY] = { "IDENTIFY", cmd_infostat_identify, 0, 0 },
+    [INFOSTAT][BACKGROUND_OPERATION_STATUS] = { "BACKGROUND_OPERATION_STATUS",
+        cmd_infostat_bg_op_sts, 0, 0 },
     [TIMESTAMP][GET] = { "TIMESTAMP_GET", cmd_timestamp_get, 0, 0 },
     [TIMESTAMP][SET] = { "TIMESTAMP_SET", cmd_timestamp_set, 0,
                          IMMEDIATE_POLICY_CHANGE },