Chris Wilson 0b466dc238 drm/i915: Mark uneven memory banks on gen4 desktop as unknown swizzling ... We have varied reports of swizzling corruption on gen4 desktop, and confirmation that one at least is triggered by uneven memory banks (L-shaped memory). The implication is that the swizzling varies between the paired channels and the remainder of memory on the single channel. As the object then has unpredictable swizzling (it will vary depending on exact page allocation and may even change during the object's lifetime as the pages are replaced), we have to report to userspace that the swizzling is unknown. However, some existing userspace is buggy when it meets an unknown swizzling configuration and so we need to tell another white lie and mark the swizzling as NONE but report it as UNKNOWN through the extended get-tiling-ioctl. See commit 5eb3e5a5e1 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Sun Jun 28 09:19:26 2015 +0100 drm/i915: Declare the swizzling unknown for L-shaped configurations for the previous example where we found that telling the truth to userspace just ends up in a world of hurt. Also since we don't truly know what the swizzling is on the pages, we need to keep them pinned to prevent swapping as the reports also suggest that some gen4 devices have previously undetected bit17 swizzling. v2: Combine unknown + quirk patches to prevent userspace ever seeing unknown swizzling through the normal get-tiling-ioctl. Also use the same path for the existing uneven bank detection for mobile gen4. Reported-by: Matti Hämäläinen <ccr@tnsp.org> Tested-by: Matti Hämäläinen <ccr@tnsp.org> References: https://bugs.freedesktop.org/show_bug.cgi?id=90725 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Matti Hämäläinen <ccr@tnsp.org> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Jani Nikula <jani.nikula@intel.com> Cc: stable@vger.kernel.org Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1447927085-31726-1-git-send-email-chris@chris-wilson.co.uk Signed-off-by: Jani Nikula <jani.nikula@intel.com>		2015-11-23 16:42:33 +02:00
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drm	drm/i915: Mark uneven memory banks on gen4 desktop as unknown swizzling	2015-11-23 16:42:33 +02:00
host1x	gpu: host1x: Fix MLOCK's debug info	2015-10-02 14:40:12 +02:00
ipu-v3	imx-drm fixes and color format updates	2015-11-05 11:06:56 +10:00
vga	vga_switcheroo: Drop client power state VGA_SWITCHEROO_INIT	2015-11-05 11:07:36 +10:00
Makefile	gpu: host1x: Provide a proper struct bus_type	2015-01-27 10:09:14 +01:00