[PATCH 2/2] hw/cxl/cxl_event: Fix interrupt triggering for dynamic capacity events grouped via More flag

[nifan.cxl@gmail.com]

From: Fan Ni <fan.ni@samsung.com>

When inserting multiple dynamic capacity event records grouped via More flag,
we should only trigger interrupt after the last record is inserted into the
event log. Achieving the goal by letting cxl_event_insert return true only
for the insertion of the last dynamic capacity event record in the sequence.

Signed-off-by: Fan Ni <fan.ni@samsung.com>
---
 hw/cxl/cxl-events.c         | 8 ++++++++
 include/hw/cxl/cxl_events.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/hw/cxl/cxl-events.c b/hw/cxl/cxl-events.c
index 12dee2e467..90536c0e68 100644
--- a/hw/cxl/cxl-events.c
+++ b/hw/cxl/cxl-events.c
@@ -135,6 +135,14 @@ bool cxl_event_insert(CXLDeviceState *cxlds, CXLEventLogType log_type,
     QSIMPLEQ_INSERT_TAIL(&log->events, entry, node);
     cxl_event_set_status(cxlds, log_type, true);
 
+    /*
+     * For dynamic capacity event records grouped via More flag,
+     * Only raise interrupt after inserting the last record in the log.
+     */
+    if (log_type == CXL_EVENT_TYPE_DYNAMIC_CAP) {
+        CXLEventDynamicCapacity *dCap = (CXLEventDynamicCapacity *)event;
+        return (dCap->flags & MORE_FLAG) ? false : true;
+    }
     /* Count went from 0 to 1 */
     return cxl_event_count(log) == 1;
 }
diff --git a/include/hw/cxl/cxl_events.h b/include/hw/cxl/cxl_events.h
index 38cadaa0f3..b0e5cc89c0 100644
--- a/include/hw/cxl/cxl_events.h
+++ b/include/hw/cxl/cxl_events.h
@@ -170,6 +170,7 @@ typedef struct CXLEventMemoryModule {
  * CXL r3.1 section Table 8-50: Dynamic Capacity Event Record
  * All fields little endian.
  */
+#define MORE_FLAG BIT_MASK(0)
 typedef struct CXLEventDynamicCapacity {
     CXLEventRecordHdr hdr;
     uint8_t type;
-- 
2.43.0