From: Eric Anholt <eric@anholt.net>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 1/2] drm/i915: Allow DRM_ROOT_ONLY|DRM_MASTER to submit privileged batchbuffers
Date: Wed, 17 Oct 2012 11:47:10 -0700 [thread overview]
Message-ID: <87r4oxc4wh.fsf@eliezer.anholt.net> (raw)
In-Reply-To: <1350472195-8051-1-git-send-email-chris@chris-wilson.co.uk>
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Chris Wilson <chris@chris-wilson.co.uk> writes:
> With the introduction of per-process GTT space, the hardware designers
> thought it wise to also limit the ability to write to MMIO space to only
> a "secure" batch buffer. The ability to rewrite registers is the only
> way to program the hardware to perform certain operations like scanline
> waits (required for tear-free windowed updates). So we either have a
> choice of adding an interface to perform those synchronized updates
> inside the kernel, or we permit certain processes the ability to write
> to the "safe" registers from within its command stream. This patch
> exposes the ability to submit a SECURE batch buffer to
> DRM_ROOT_ONLY|DRM_MASTER processes.
This seems like a major blow to ever getting non-root X.
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next prev parent reply other threads:[~2012-10-17 18:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-16 9:47 [PATCH] drm/i915: Set DERRMR around batches required vblank events Chris Wilson
2012-10-16 14:15 ` Daniel Vetter
2012-10-17 11:09 ` [PATCH 1/2] drm/i915: Allow DRM_ROOT_ONLY|DRM_MASTER to submit privileged batchbuffers Chris Wilson
2012-10-17 11:09 ` [PATCH 2/2] drm/i915: Document the multi-threaded FORCEWAKE bits Chris Wilson
2012-10-17 16:27 ` Jesse Barnes
2012-10-17 17:05 ` Jesse Barnes
2012-10-17 19:10 ` Daniel Vetter
2012-10-17 16:31 ` [PATCH 1/2] drm/i915: Allow DRM_ROOT_ONLY|DRM_MASTER to submit privileged batchbuffers Jesse Barnes
2012-10-17 19:09 ` Daniel Vetter
2012-10-17 18:47 ` Eric Anholt [this message]
2012-10-17 19:04 ` Daniel Vetter
2012-10-17 13:58 ` [PATCH] drm/i915: Set DERRMR around batches required vblank events Chris Wilson
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