From: Kenneth Graunke <kenneth@whitecape.org>
To: bradley.d.volkin@intel.com, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH v2 3/3] drm/i915: Track OACONTROL register enable/disable during parsing
Date: Fri, 28 Mar 2014 10:37:29 -0700 [thread overview]
Message-ID: <5335B359.9070809@whitecape.org> (raw)
In-Reply-To: <1396027310-16951-1-git-send-email-bradley.d.volkin@intel.com>
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On 03/28/2014 10:21 AM, bradley.d.volkin@intel.com wrote:
> From: Brad Volkin <bradley.d.volkin@intel.com>
>
> There is some thought that the data from the performance counters enabled
> via OACONTROL should only be available to the process that enabled counting.
> To limit snooping, require that any batch buffer which sets OACONTROL to a
> non-zero value also sets it back to 0 before the end of the batch.
>
> This requires limiting OACONTROL writes to happen via MI_LOAD_REGISTER_IMM
> so that we can access the value being written. This should be in line with
> the expected use case for writing OACONTROL.
>
> v2: Drop an unnecessary '? true : false'
>
> Cc: Kenneth Graunke <kenneth@whitecape.org>
> Signed-off-by: Brad Volkin <bradley.d.volkin@intel.com>
I still don't see any rationale for prohibiting LRM - there's zero
security benefit, and you can write to every other register with either
LRI or LRM, so it's just extra inconsistency. But, Daniel.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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next prev parent reply other threads:[~2014-03-28 17:37 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-27 18:43 [PATCH 0/3] Fix up cmd parser OACONTROL handling + refactorings bradley.d.volkin
2014-03-27 18:43 ` [PATCH 1/3] drm/i915: BUG_ON() when cmd/reg tables are not sorted bradley.d.volkin
2014-03-27 21:47 ` Kenneth Graunke
2014-03-27 23:56 ` Volkin, Bradley D
2014-04-02 9:11 ` Jani Nikula
2014-04-02 9:35 ` Daniel Vetter
2014-03-27 18:43 ` [PATCH 2/3] drm/i915: Refactor cmd parser checks into a function bradley.d.volkin
2014-03-27 21:49 ` Kenneth Graunke
2014-04-02 9:14 ` Jani Nikula
2014-03-27 18:43 ` [PATCH 3/3] drm/i915: Track OACONTROL register enable/disable during parsing bradley.d.volkin
2014-03-27 21:58 ` Kenneth Graunke
2014-03-28 0:06 ` Volkin, Bradley D
2014-03-28 7:51 ` Daniel Vetter
2014-03-28 17:21 ` [PATCH v2 " bradley.d.volkin
2014-03-28 17:37 ` Kenneth Graunke [this message]
2014-04-02 9:35 ` Jani Nikula
2014-04-10 6:07 ` Zhenyu Wang
2014-04-10 6:43 ` Daniel Vetter
2014-04-10 7:51 ` Zhenyu Wang
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