hw/cxl/mbox: Add support for background operations

Support background commands in the mailbox, and update
cmd_infostat_bg_op_sts() accordingly. This patch does not implement mbox
interrupts upon completion, so the kernel driver must rely on polling to
know when the operation is done.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Message-Id: <20231023160806.13206-12-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index fa73ed03e5..124ff969ec 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -149,6 +149,16 @@ typedef struct CXLCCI {
     } cel_log[1 << 16];
     size_t cel_size;
 
+    /* background command handling (times in ms) */
+    struct {
+        uint16_t opcode;
+        uint16_t complete_pct;
+        uint16_t ret_code; /* Current value of retcode */
+        uint64_t starttime;
+        /* set by each bg cmd, cleared by the bg_timer when complete */
+        uint64_t runtime;
+        QEMUTimer *timer;
+    } bg;
     size_t payload_max;
     /* Pointer to device hosting the CCI */
     DeviceState *d;