From: Jani Nikula <jani.nikula@linux.intel.com>
To: Intel GFX <intel-gfx@lists.freedesktop.org>
Cc: Ben Widawsky <ben@bwidawsk.net>,
Ben Widawsky <benjamin.widawsky@intel.com>
Subject: Re: [PATCH] drm/i915/bdw: Fix 4g GGTT insert entries regression
Date: Wed, 05 Mar 2014 11:13:12 +0200 [thread overview]
Message-ID: <87bnxl3t5j.fsf@intel.com> (raw)
In-Reply-To: <1393996999-1930-1-git-send-email-benjamin.widawsky@intel.com>
On Wed, 05 Mar 2014, Ben Widawsky <benjamin.widawsky@intel.com> wrote:
> The PDE needs to wrap after writing all the PTEs. Quite a small/silly
> bug to find in the massive change. It was introduced:
> commit 307dc4f99f6d3a74a78b0e776838f35b2004f14d
> Author: Ben Widawsky <benjamin.widawsky@intel.com>
> Date: Thu Feb 20 11:51:21 2014 -0800
>
> drm/i915/bdw: Reorganize PT allocations
As noted in the bug, the commit merged to dinq is correct, and the
commit referenced above apparently only lives in some temporary branch.
BR,
Jani.
>
> I can't actually test this patch at the moment because my Broadwell is
> unresponsive. This should be squashed if possible.
>
> Cc: Imre Deak <imre.deak@intel.com>
> Reported-by: Timo Aaltonen <tjaalton@ubuntu.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75763
> Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
> ---
> drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 5462037..2bde703 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -335,7 +335,7 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
> if (++pte == GEN8_PTES_PER_PAGE) {
> kunmap_atomic(pt_vaddr);
> pt_vaddr = NULL;
> - if (pde + 1 == GEN8_PDES_PER_PAGE) {
> + if (++pde == GEN8_PDES_PER_PAGE) {
> pdpe++;
> pde = 0;
> }
> --
> 1.9.0
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Jani Nikula, Intel Open Source Technology Center
next prev parent reply other threads:[~2014-03-05 9:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-05 5:23 [PATCH] drm/i915/bdw: Fix 4g GGTT insert entries regression Ben Widawsky
2014-03-05 9:13 ` Jani Nikula [this message]
2014-03-05 15:24 ` Ben Widawsky
2014-03-05 20:19 ` Ben Widawsky
2014-03-05 20:28 ` Daniel Vetter
2014-03-06 5:31 ` Jani Nikula
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