uapi/hfi1_user: Add command and event for TID caching

TID caching will use a new event to signal userland that cache
invalidation has occurred and needs a matching command code that
will be used to read the invalidated TIDs.

Add the event bit and the new command to the exported header file.

The command is also added to the switch() statement in file_ops.c
for completeness and in preparation for its usage later.

Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/staging/rdma/hfi1/file_ops.c

@@ -241,6 +241,7 @@ static ssize_t hfi1_file_write(struct file *fp, const char __user *data,
 		must_be_root = 1;	/* validate user */
 		copy = 0;
 		break;
+	case HFI1_CMD_TID_INVAL_READ:
 	default:
 		ret = -EINVAL;
 		goto bail;

include/uapi/rdma/hfi/hfi1_user.h

@@ -134,6 +134,7 @@
 #define HFI1_CMD_ACK_EVENT       10	/* ack & clear user status bits */
 #define HFI1_CMD_SET_PKEY        11     /* set context's pkey */
 #define HFI1_CMD_CTXT_RESET      12     /* reset context's HW send context */
+#define HFI1_CMD_TID_INVAL_READ  13     /* read TID cache invalidations */
 /* separate EPROM commands from normal PSM commands */
 #define HFI1_CMD_EP_INFO         64      /* read EPROM device ID */
 #define HFI1_CMD_EP_ERASE_CHIP   65      /* erase whole EPROM */
@@ -147,13 +148,15 @@
 #define _HFI1_EVENT_LID_CHANGE_BIT     2
 #define _HFI1_EVENT_LMC_CHANGE_BIT     3
 #define _HFI1_EVENT_SL2VL_CHANGE_BIT   4
-#define _HFI1_MAX_EVENT_BIT _HFI1_EVENT_SL2VL_CHANGE_BIT
+#define _HFI1_EVENT_TID_MMU_NOTIFY_BIT 5
+#define _HFI1_MAX_EVENT_BIT _HFI1_EVENT_TID_MMU_NOTIFY_BIT
 
 #define HFI1_EVENT_FROZEN            (1UL << _HFI1_EVENT_FROZEN_BIT)
 #define HFI1_EVENT_LINKDOWN          (1UL << _HFI1_EVENT_LINKDOWN_BIT)
 #define HFI1_EVENT_LID_CHANGE        (1UL << _HFI1_EVENT_LID_CHANGE_BIT)
 #define HFI1_EVENT_LMC_CHANGE        (1UL << _HFI1_EVENT_LMC_CHANGE_BIT)
 #define HFI1_EVENT_SL2VL_CHANGE      (1UL << _HFI1_EVENT_SL2VL_CHANGE_BIT)
+#define HFI1_EVENT_TID_MMU_NOTIFY    (1UL << _HFI1_EVENT_TID_MMU_NOTIFY_BIT)
 
 /*
  * These are the status bits readable (in ASCII form, 64bit value)