Specification Sheet

GFXVTBAR Registers
278 Datasheet, Volume 2 of 2
Bit
Range
Default &
Access
Field Name (ID): Description
31
1h
RW
IM:
0: No masking of interrupt. When an interrupt condition is detected, hardware issues
an interrupt message (using the Fault Event Data and Fault Event Address register
values).
1: This is the value on reset. Software may mask interrupt message generation by
setting this field. Hardware is prohibited from sending the interrupt message when this
field is set.
30
0h
ROV
IP: Hardware sets the IP field whenever it detects an interrupt condition, which is
defined as:
When primary fault logging is active, an interrupt condition occurs when hardware
records a fault through one of the Fault Recording registers and sets the PPF field in
Fault Status register.
When advanced fault logging is active, an interrupt condition occurs when hardware
records a fault in the first fault record (at index 0) of the current fault log and sets the
APF field in the Fault Status register.
Hardware detected error associated with the Invalidation Queue, setting the IQE field
in the Fault Status register.
Hardware detected invalid Device-IOTLB invalidation completion, setting the ICE field
in the Fault Status register.
Hardware detected Device-IOTLB invalidation completion time-out, setting the ITE
field in the Fault Status register.
If any of the status fields in the Fault Status register was already Set at the time of
setting any of these fields, it is not treated as a new interrupt condition.
The IP field is kept set by hardware while the interrupt message is held pending. The
interrupt message could be held pending due to interrupt mask (IM field) being Set or
other transient hardware conditions.
The IP field is cleared by hardware as soon as the interrupt message pending condition
is serviced. This could be due to either:
Hardware issuing the interrupt message due to either change in the transient
hardware condition that caused interrupt message to be held pending, or due to
software clearing the IM field.
Software servicing all the pending interrupt status fields in the Fault Status register as
follows:
• When primary fault logging is active, software clearing the Fault (F) field in all the
Fault Recording registers with faults, causing the PPF field in Fault Status register
to be evaluated as clear.
• Software clearing other status fields in the Fault Status register by writing back
the value read from the respective fields.
29:0
0h
RO
Reserved (RSVD): Reserved.