hw/cxl/events: Wire up get/clear event mailbox commands

CXL testing is benefited from an artificial event log injection
mechanism.

Add an event log infrastructure to insert, get, and clear events from
the various logs available on a device.

Replace the stubbed out CXL Get/Clear Event mailbox commands with
commands that operate on the new infrastructure.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230530133603.16934-4-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 80 insertions, 0 deletions

diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index 9f8ee85..d3aec1b 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -111,6 +111,20 @@ typedef enum {
     CXL_MBOX_MAX = 0x17
 } CXLRetCode;
 
+typedef struct CXLEvent {
+    CXLEventRecordRaw data;
+    QSIMPLEQ_ENTRY(CXLEvent) node;
+} CXLEvent;
+
+typedef struct CXLEventLog {
+    uint16_t next_handle;
+    uint16_t overflow_err_count;
+    uint64_t first_overflow_timestamp;
+    uint64_t last_overflow_timestamp;
+    QemuMutex lock;
+    QSIMPLEQ_HEAD(, CXLEvent) events;
+} CXLEventLog;
+
 typedef struct cxl_device_state {
     MemoryRegion device_registers;
 
@@ -161,6 +175,8 @@ typedef struct cxl_device_state {
     uint64_t mem_size;
     uint64_t pmem_size;
     uint64_t vmem_size;
+
+    CXLEventLog event_logs[CXL_EVENT_TYPE_MAX];
 } CXLDeviceState;
 
 /* Initialize the register block for a device */
@@ -353,6 +369,15 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data,
 
 uint64_t cxl_device_get_timestamp(CXLDeviceState *cxlds);
 
+void cxl_event_init(CXLDeviceState *cxlds);
+bool cxl_event_insert(CXLDeviceState *cxlds, CXLEventLogType log_type,
+                      CXLEventRecordRaw *event);
+CXLRetCode cxl_event_get_records(CXLDeviceState *cxlds, CXLGetEventPayload *pl,
+                                 uint8_t log_type, int max_recs,
+                                 uint16_t *len);
+CXLRetCode cxl_event_clear_records(CXLDeviceState *cxlds,
+                                   CXLClearEventPayload *pl);
+
 void cxl_set_poison_list_overflowed(CXLType3Dev *ct3d);
 
 #endif
diff --git a/include/hw/cxl/cxl_events.h b/include/hw/cxl/cxl_events.h
index aeb3b05..d4aaa89 100644
--- a/include/hw/cxl/cxl_events.h
+++ b/include/hw/cxl/cxl_events.h
@@ -10,6 +10,8 @@
 #ifndef CXL_EVENTS_H
 #define CXL_EVENTS_H
 
+#include "qemu/uuid.h"
+
 /*
  * CXL rev 3.0 section 8.2.9.2.2; Table 8-49
  *
@@ -25,4 +27,57 @@ typedef enum CXLEventLogType {
     CXL_EVENT_TYPE_MAX
 } CXLEventLogType;
 
+/*
+ * Common Event Record Format
+ * CXL rev 3.0 section 8.2.9.2.1; Table 8-42
+ */
+#define CXL_EVENT_REC_HDR_RES_LEN 0xf
+typedef struct CXLEventRecordHdr {
+    QemuUUID id;
+    uint8_t length;
+    uint8_t flags[3];
+    uint16_t handle;
+    uint16_t related_handle;
+    uint64_t timestamp;
+    uint8_t maint_op_class;
+    uint8_t reserved[CXL_EVENT_REC_HDR_RES_LEN];
+} QEMU_PACKED CXLEventRecordHdr;
+
+#define CXL_EVENT_RECORD_DATA_LENGTH 0x50
+typedef struct CXLEventRecordRaw {
+    CXLEventRecordHdr hdr;
+    uint8_t data[CXL_EVENT_RECORD_DATA_LENGTH];
+} QEMU_PACKED CXLEventRecordRaw;
+#define CXL_EVENT_RECORD_SIZE (sizeof(CXLEventRecordRaw))
+
+/*
+ * Get Event Records output payload
+ * CXL rev 3.0 section 8.2.9.2.2; Table 8-50
+ */
+#define CXL_GET_EVENT_FLAG_OVERFLOW     BIT(0)
+#define CXL_GET_EVENT_FLAG_MORE_RECORDS BIT(1)
+typedef struct CXLGetEventPayload {
+    uint8_t flags;
+    uint8_t reserved1;
+    uint16_t overflow_err_count;
+    uint64_t first_overflow_timestamp;
+    uint64_t last_overflow_timestamp;
+    uint16_t record_count;
+    uint8_t reserved2[0xa];
+    CXLEventRecordRaw records[];
+} QEMU_PACKED CXLGetEventPayload;
+#define CXL_EVENT_PAYLOAD_HDR_SIZE (sizeof(CXLGetEventPayload))
+
+/*
+ * Clear Event Records input payload
+ * CXL rev 3.0 section 8.2.9.2.3; Table 8-51
+ */
+typedef struct CXLClearEventPayload {
+    uint8_t event_log;      /* CXLEventLogType */
+    uint8_t clear_flags;
+    uint8_t nr_recs;
+    uint8_t reserved[3];
+    uint16_t handle[];
+} CXLClearEventPayload;
+
 #endif /* CXL_EVENTS_H */