DXGK_UPDATECURRENTVALUESFROMCPU_FLAGS structure (d3dkmddi.h)

DXGK_UPDATECURRENTVALUESFROMCPU_FLAGS specifies flags to use when updating the current value of a batch of native fences from the CPU.

Syntax

typedef struct _DXGK_UPDATECURRENTVALUESFROMCPU_FLAGS {
  union {
    struct {
      UINT AlwaysSignaled : 1;
      UINT NotificationOnly : 1;
      UINT Reserved : 30;
    };
    UINT Value;
  };
} DXGK_UPDATECURRENTVALUESFROMCPU_FLAGS;

Members

AlwaysSignaled

To handle special cases such as the parent device of the fence being put in error, Dxgkrnl will provide a new CurrentValue as 0xFFFFFFFF and call DxgkDdiUpdateCurrentValuesFromCpu with the AlwaysSignaled flag set. This flag indicates to the driver that the fence object CurrentValue can't be relied upon to be updated as before. The driver / context management processor must ensure that when it sees a GPU wait of this fence, it must be unblocked immediately without actually queuing a wait. Similarly, when it sees a signal of this fence it should be a no-op and not touch the fence storage.

NotificationOnly

OS sets this flag to inform KMD that it should not actually write a new value to CurrentValue location, and instead this call is just a notification that CurrentValue was updated and KMD should re-scan its runlist to unblock any GPU waiters that are now signaled. This flag is used to handle cross-adapter native fences, as described in Native GPU fence objects.

Reserved

Reserved for system use.

Value

An alternative way to access the flags.

Remarks

For more information about native GPU fences, see Native GPU fence objects.

Requirements

See also

DXGKARG_UPDATECURRENTVALUESFROMCPU

DxgkDdiUpdateCurrentValuesFromCpu