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From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Subject: [PATCH] drm/i915/cnl: Use mmio access to context status buffer
Date: Thu, 12 Apr 2018 17:58:02 +0300	[thread overview]
Message-ID: <20180412145802.23313-1-mika.kuoppala@linux.intel.com> (raw)

Evidence indicates that Cannonlake HWSP is not coherent
as it should. Revert to using mmio access for now.

Testcase: igt/gem_ctx_switch
References: https://bugs.freedesktop.org/show_bug.cgi?id=105888
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Rafael Antognolli <rafael.antognolli@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_engine_cs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 68898d58dd1e..1a8370779bbb 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -475,6 +475,9 @@ static bool csb_force_mmio(struct drm_i915_private *i915)
 	if (intel_vgpu_active(i915) && !intel_vgpu_has_hwsp_emulation(i915))
 		return true;
 
+	if (IS_CANNONLAKE(i915))
+		return true;
+
 	return false;
 }
 
-- 
2.14.1

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             reply	other threads:[~2018-04-12 14:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-12 14:58 Mika Kuoppala [this message]
2018-04-12 15:06 ` [PATCH] drm/i915/cnl: Use mmio access to context status buffer Chris Wilson
2018-04-12 15:31 ` ✓ Fi.CI.BAT: success for " Patchwork
2018-04-12 16:31 ` ✓ Fi.CI.IGT: " Patchwork
2018-04-20 21:43 ` [PATCH] " Rodrigo Vivi

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