Chris Wilson e22d8e3c69 drm/i915: Treat WC a separate cache domain ... When discussing a new WC mmap, we based the interface upon the assumption that GTT was fully coherent. How naive! Commits 3b5724d702 ("drm/i915: Wait for writes through the GTT to land before reading back") and ed4596ea99 ("drm/i915/guc: WA to address the Ringbuffer coherency issue") demonstrate that writes through the GTT are indeed delayed and may be overtaken by direct WC access. To be safe, if userspace is mixing WC mmaps with other potential GTT access (pwrite, GTT mmaps) it should use set_domain(WC). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96563 Testcase: igt/gem_pwrite/small-gtt* Testcase: igt/drv_selftest/coherency Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170412110111.26626-2-chris@chris-wilson.co.uk		2017-04-12 12:35:17 +01:00
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drm	drm/i915: Treat WC a separate cache domain	2017-04-12 12:35:17 +01:00
host1x
ipu-v3	gpu: ipu-v3: don't depend on DRM being enabled	2017-04-04 10:58:56 +02:00
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