From: Chris Wilson <chris@chris-wilson.co.uk>
To: Mika Kuoppala <mika.kuoppala@linux.intel.com>,
intel-gfx@lists.freedesktop.org
Cc: Rodrigo <rodrigo.vivi@intel.com>, Vivi@rosetta.fi.intel.com
Subject: Re: [PATCH] drm/i915: Enforce read order into the hardware status page csb
Date: Thu, 12 Apr 2018 14:57:42 +0100 [thread overview]
Message-ID: <152354146218.27126.12998989228290708913@mail.alporthouse.com> (raw)
In-Reply-To: <20180412135237.9393-1-mika.kuoppala@linux.intel.com>
Quoting Mika Kuoppala (2018-04-12 14:52:37)
> Read ordering on cpu can be out of order and speculative.
If it didn't include a barrier to prevent compiler mispeculation. rmb()
only applies to other CPU cores and not the GPU so this is entirely
hocus.
-Chris
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next prev parent reply other threads:[~2018-04-12 13:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-12 13:52 [PATCH] drm/i915: Enforce read order into the hardware status page csb Mika Kuoppala
2018-04-12 13:57 ` Chris Wilson [this message]
2018-04-12 13:59 ` Chris Wilson
2018-04-12 14:01 ` Chris Wilson
2018-04-12 14:04 ` Mika Kuoppala
2018-04-12 14:27 ` ✓ Fi.CI.BAT: success for " Patchwork
2018-04-12 15:10 ` ✓ Fi.CI.IGT: " Patchwork
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