commit: 43b27290dd42b40f3f23f49677a7faa5a4eb1eff
From: "Zhang, Xiong Y" <xiong.y.zhang@xxxxxxxxx>
Date: Sat, 27 Apr 2013 09:53:33 +0000
Subject: drm/i915: correct the calculation of first_pd_entry_in_global_pt
When ppgtt is enabled, dev_priv->gtt.total has excluded the gtt space
occupied by ppgtt table in i915_gem_init_global_gtt() function. So the
calculation of first_pd_entry_in_global_pt doesn't need to subtract
I915_PPGTT_PD_ENTRIES again. Or else PPGTT directory table will be
destroyed by global gtt allocation.
This regression has been introduced in
commit a54c0c279f3864171fe53c66e769d5a137c5c651
Author: Ben Widawsky <ben@xxxxxxxxxxxx>
Date: Thu Jan 24 14:45:00 2013 -0800
drm/i915: remove intel_gtt structure
The breakage is pretty subtile since the old gtt_total_entries
included the pde range, whereas the new on did not.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Xiong Zhang<xiong.y.zhang@xxxxxxxxx>
[danvet: Add regression citation and cc: stable. Thanks to Chris for
correcting my wrong guess about which commit broke things.]
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 50df194..dca614d 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -233,8 +233,7 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
/* ppgtt PDEs reside in the global gtt pagetable, which has 512*1024
* entries. For aliasing ppgtt support we just steal them at the end for
* now. */
- first_pd_entry_in_global_pt =
- gtt_total_entries(dev_priv->gtt) - I915_PPGTT_PD_ENTRIES;
+ first_pd_entry_in_global_pt = gtt_total_entries(dev_priv->gtt);
ppgtt->num_pd_entries = I915_PPGTT_PD_ENTRIES;
ppgtt->enable = gen6_ppgtt_enable;
--
1.7.10.4
--
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