linux-kernel - [PATCH 4.10 51/69] drm/i915/gvt: set the correct default value of CTX STATUS PTR

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Message-Id: <20170419141557.246296684@linuxfoundation.org>
Date:   Wed, 19 Apr 2017 16:37:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Min He <min.he@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: [PATCH 4.10 51/69] drm/i915/gvt: set the correct default value of CTX STATUS PTR

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Min He <min.he@...el.com>

commit a34f83639490a5cc11a9d5c1b3773d4b6eb69a9e upstream.

Fix wrong initial csb read pointer value. This fixes the random
engine timeout issue in guest when guest boots up.

Fixes: 8453d674ae7e ("drm/i915/gvt: vGPU execlist virtualization")
Signed-off-by: Min He <min.he@...el.com>
Signed-off-by: Zhenyu Wang <zhenyuw@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/gvt/execlist.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gvt/execlist.c
+++ b/drivers/gpu/drm/i915/gvt/execlist.c
@@ -778,7 +778,8 @@ static void init_vgpu_execlist(struct in
 			_EL_OFFSET_STATUS_PTR);
 
 	ctx_status_ptr.dw = vgpu_vreg(vgpu, ctx_status_ptr_reg);
-	ctx_status_ptr.read_ptr = ctx_status_ptr.write_ptr = 0x7;
+	ctx_status_ptr.read_ptr = 0;
+	ctx_status_ptr.write_ptr = 0x7;
 	vgpu_vreg(vgpu, ctx_status_ptr_reg) = ctx_status_ptr.dw;
 }