| commit | 95736720fc866eadb2ce1789631b907c0f38cb7c | |
| author | Chris Wilson <chris@chris-wilson.co.uk> | |
| Thu, 12 May 2011 21:17:09 +0000 (12 22:17 +0100) | ||
| committer | Keith Packard <keithp@keithp.com> | |
| Wed, 13 Jul 2011 18:28:07 +0000 (13 11:28 -0700) | ||
| tree | 5071fe60b3cdd5951e351e1565121287aa17675a | treesnapshot (tar.gz zip) |
| parent | f5a3d0c4086d1854cbda545092c462b84cba20ce | commitdiff |
drm/i915: Cache GT fifo count for SandyBridge
The read back of the available FIFO entries is vital for system
stability, but extremely costly. However, we only need a guide so as to
avoid eating into the reserved entries and since we are the only
consumer we can cache the read of the count from the last write.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
The read back of the available FIFO entries is vital for system
stability, but extremely costly. However, we only need a guide so as to
avoid eating into the reserved entries and since we are the only
consumer we can cache the read of the count from the last write.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
| drivers/gpu/drm/i915/i915_drv.c | diffblobblamehistory | |
| drivers/gpu/drm/i915/i915_drv.h | diffblobblamehistory | |
| drivers/gpu/drm/i915/i915_reg.h | diffblobblamehistory |