From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Ben Widawsky <benjamin.widawsky@intel.com>
Cc: Intel GFX <intel-gfx@lists.freedesktop.org>,
Ben Widawsky <ben@bwidawsk.net>
Subject: Re: [PATCH 08/13] drm/i915/bdw: poll semaphores
Date: Mon, 24 Feb 2014 15:06:13 +0200 [thread overview]
Message-ID: <20140224130613.GP3852@intel.com> (raw)
In-Reply-To: <1392877166-9195-8-git-send-email-benjamin.widawsky@intel.com>
On Wed, Feb 19, 2014 at 10:19:21PM -0800, Ben Widawsky wrote:
> Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
> ---
> drivers/gpu/drm/i915/intel_ringbuffer.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 3d5dd4a..5f7bee8 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -813,6 +813,7 @@ gen8_ring_sync(struct intel_ring_buffer *waiter,
>
> intel_ring_emit(waiter, MI_SEMAPHORE_WAIT |
> MI_SEMAPHORE_GLOBAL_GTT |
> + MI_SEMAPHORE_POLL |
I discussed this on irc w/ Ben, and I was suggesting we don't need to
poll. Polling apparently can be used as a workaround for certain
hardware issues, but it looks like those issues shouldn't affect us,
for the momemnt at least. So my suggestion was to try w/o polling first
(since there could be some power cost to polling) and add the poll bit
if problems arise.
> MI_SEMAPHORE_SAD_GTE_SDD);
> intel_ring_emit(waiter, seqno);
> intel_ring_emit(waiter,
> --
> 1.9.0
--
Ville Syrjälä
Intel OTC
next prev parent reply other threads:[~2014-02-24 13:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-20 6:19 [PATCH 01/13] drm/i915: Move semaphore specific ring members to struct Ben Widawsky
2014-02-20 6:19 ` [PATCH 02/13] drm/i915: Virtualize the ringbuffer signal func Ben Widawsky
2014-02-20 6:19 ` [PATCH 03/13] drm/i915: Move ring_begin to signal() Ben Widawsky
2014-02-20 6:19 ` [PATCH 04/13] drm/i915: Make semaphore updates more precise Ben Widawsky
2014-02-24 13:09 ` Ville Syrjälä
2014-02-20 6:19 ` [PATCH 05/13] drm/i915: gen specific ring init Ben Widawsky
2014-02-24 13:05 ` Ville Syrjälä
2014-02-20 6:19 ` [PATCH 06/13] drm/i915/bdw: implement semaphore signal Ben Widawsky
2014-02-24 13:10 ` Ville Syrjälä
2014-03-05 12:24 ` Ville Syrjälä
2014-02-20 6:19 ` [PATCH 07/13] drm/i915/bdw: implement semaphore wait Ben Widawsky
2014-02-20 6:19 ` [PATCH 08/13] drm/i915/bdw: poll semaphores Ben Widawsky
2014-02-24 13:06 ` Ville Syrjälä [this message]
2014-02-20 6:19 ` [PATCH 09/13] drm/i915: Extract semaphore error collection Ben Widawsky
2014-02-20 6:19 ` [PATCH 10/13] drm/i915/bdw: collect semaphore error state Ben Widawsky
2014-02-24 13:08 ` Ville Syrjälä
2014-04-29 21:43 ` Ben Widawsky
2014-02-20 6:19 ` [PATCH 11/13] drm/i915: unleash semaphores on gen8 Ben Widawsky
2014-02-20 6:19 ` [PATCH 12/13] drm/i915: semaphore debugfs Ben Widawsky
2014-02-20 6:19 ` [PATCH 13/13] DONT_MERGE drm/i915: FORCE_RESTORE for gen8 semaphores Ben Widawsky
2014-03-05 12:29 ` [PATCH 01/13] drm/i915: Move semaphore specific ring members to struct Ville Syrjälä
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