Attachment 75174 Details for Bug 59626 – Align scanouts to 256KiB

[patch] Align scanouts to 256KiB

0001-drm-i915-Align-scanouts-to-256k-when-VT-d-is-enabled.patch (text/plain), 1.56 KB, created by Chris Wilson on 2013-02-20 14:45:20 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Chris Wilson

Created: 2013-02-20 14:45:20 UTC

Size: 1.56 KB

patch

obsolete

>From 4928a41bd3342b359e65eb4d0b2f8b854c902294 Mon Sep 17 00:00:00 2001
>From: Chris Wilson <chris@chris-wilson.co.uk>
>Date: Wed, 20 Feb 2013 14:41:41 +0000
>Subject: [PATCH] drm/i915: Align scanouts to 256k when VT-d is enabled
>
>From the w/a database:
>
>'To prevent false VT-d type 6 error, the scanouts must be 256KiB
>aligned, and require an extra 128 PTEs of padding afterward'
>
>This implements the first step of aligning the scanouts as required.
>
>References: https://bugs.freedesktop.org/show_bug.cgi?id=59626
>Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
>---
> drivers/gpu/drm/i915/intel_display.c |   12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>index 86edbb2..f97de05 100644
>--- a/drivers/gpu/drm/i915/intel_display.c
>+++ b/drivers/gpu/drm/i915/intel_display.c
>@@ -2006,6 +2006,15 @@ static void intel_disable_plane(struct drm_i915_private *dev_priv,
> 	intel_wait_for_vblank(dev_priv->dev, pipe);
> }
> 
>+static bool need_vtd_wa(struct drm_device *dev)
>+{
>+#ifdef CONFIG_INTEL_IOMMU
>+	if (INTEL_INFO(dev)->gen >= 6 && intel_iommu_gfx_mapped)
>+		return true;
>+#endif
>+	return false;
>+}
>+
> int
> intel_pin_and_fence_fb_obj(struct drm_device *dev,
> 			   struct drm_i915_gem_object *obj,
>@@ -2036,6 +2045,9 @@ intel_pin_and_fence_fb_obj(struct drm_device *dev,
> 		BUG();
> 	}
> 
>+	if (need_vtd_wa(dev) && alignment < 256 * 1024)
>+		alignment = 256 * 1024;
>+
> 	dev_priv->mm.interruptible = false;
> 	ret = i915_gem_object_pin_to_display_plane(obj, alignment, pipelined);
> 	if (ret)
>-- 
>1.7.10.4
>

Actions: View | Splinter Review

Attachments on bug 59626: 75174

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.