| commit | ed4cb4142b242d8090d3811d5eb4abf6aa985bc8 | |
| author | Eric Anholt <eric@anholt.net> | |
| Tue, 29 Jul 2008 19:10:39 +0000 (29 12:10 -0700) | ||
| committer | Dave Airlie <airlied@linux.ie> | |
| Fri, 17 Oct 2008 21:10:10 +0000 (18 07:10 +1000) | ||
| tree | 5d19db6ffec95b18654bbde820ae8ff8995f856e | treesnapshot (tar.gz zip) |
| parent | 585fb111348f7cdc30c6a1b903987612ddeafb23 | commitdiff |
i915: Add support for MSI and interrupt mitigation.
Previous attempts at interrupt mitigation had been foiled by i915_wait_irq's
failure to update the sarea seqno value when the status page indicated that
the seqno had already been passed. MSI support has been seen to cut CPU
costs by up to 40% in some workloads by avoiding other expensive interrupt
handlers for frequent graphics interrupts.
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Previous attempts at interrupt mitigation had been foiled by i915_wait_irq's
failure to update the sarea seqno value when the status page indicated that
the seqno had already been passed. MSI support has been seen to cut CPU
costs by up to 40% in some workloads by avoiding other expensive interrupt
handlers for frequent graphics interrupts.
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>