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From: Ben Widawsky <benjamin.widawsky@intel.com>
To: Intel GFX <intel-gfx@lists.freedesktop.org>
Cc: Ben Widawsky <ben@bwidawsk.net>,
	Ben Widawsky <benjamin.widawsky@intel.com>
Subject: [PATCH 13/13] DONT_MERGE drm/i915: FORCE_RESTORE for gen8 semaphores
Date: Wed, 19 Feb 2014 22:19:26 -0800	[thread overview]
Message-ID: <1392877166-9195-13-git-send-email-benjamin.widawsky@intel.com> (raw)
In-Reply-To: <1392877166-9195-1-git-send-email-benjamin.widawsky@intel.com>

This appears to not actually be needed on the current code. Just putting
it on the ML so we can point bug reports at it later.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index f8c21a6..782f633 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -655,6 +655,13 @@ static int do_switch(struct intel_ring_buffer *ring,
 	if (!to->is_initialized || i915_gem_context_is_default(to))
 		hw_flags |= MI_RESTORE_INHIBIT;
 
+	/* When SW intends to use semaphore signaling between Command streamers,
+	 * it must avoid lite restores in HW by programming "Force Restore" bit
+	 * to ‘1’ in context descriptor during context submission
+	 */
+	if (IS_GEN8(ring->dev) && i915_semaphore_is_enabled(ring->dev))
+		hw_flags |= MI_FORCE_RESTORE;
+
 	ret = mi_set_context(ring, to, hw_flags);
 	if (ret)
 		goto unpin_out;
-- 
1.9.0

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  parent reply	other threads:[~2014-02-20  6:19 UTC|newest]

Thread overview: 26+ 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
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 ` Ben Widawsky [this message]
2014-03-05 12:29 ` [PATCH 01/13] drm/i915: Move semaphore specific ring members to struct Ville Syrjälä
  -- strict thread matches above, loose matches on Subject: below --
2014-04-29 21:52 [PATCH 00/13] [REPOST] BDW Semaphores Ben Widawsky
2014-04-29 21:52 ` [PATCH 13/13] DONT_MERGE drm/i915: FORCE_RESTORE for gen8 semaphores Ben Widawsky
2014-04-30  7:13   ` Chris Wilson
2014-04-30 18:44     ` Ben Widawsky
2014-04-30 19:03       ` Chris Wilson
2014-04-30 19:27         ` Ben Widawsky

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