linux-kernel - [PATCH 2/8] drm/i915/gvt: Apply g2h adjustment during fence mmio access

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Date:   Tue, 19 Feb 2019 02:45:41 -0500
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     intel-gvt-dev@...ts.freedesktop.org, alex.williamson@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yulei Zhang <yulei.zhang@...el.com>
Subject: [PATCH 2/8] drm/i915/gvt: Apply g2h adjustment during fence mmio access

From: Yulei Zhang <yulei.zhang@...el.com>

Apply the guest to host gma conversion while guest config the
fence mmio registers due to the host gma change after the migration.

Signed-off-by: Yulei Zhang <yulei.zhang@...el.com>
---
 drivers/gpu/drm/i915/gvt/aperture_gm.c |  6 ++++--
 drivers/gpu/drm/i915/gvt/gvt.h         | 14 ++++++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/aperture_gm.c b/drivers/gpu/drm/i915/gvt/aperture_gm.c
index 359d37d5c958..123c475f2f6e 100644
--- a/drivers/gpu/drm/i915/gvt/aperture_gm.c
+++ b/drivers/gpu/drm/i915/gvt/aperture_gm.c
@@ -146,8 +146,10 @@ void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
 	I915_WRITE(fence_reg_lo, 0);
 	POSTING_READ(fence_reg_lo);
 
-	I915_WRITE(fence_reg_hi, upper_32_bits(value));
-	I915_WRITE(fence_reg_lo, lower_32_bits(value));
+	I915_WRITE(fence_reg_hi,
+		intel_gvt_reg_g2h(vgpu, upper_32_bits(value), 0xFFFFF000));
+	I915_WRITE(fence_reg_lo,
+		intel_gvt_reg_g2h(vgpu, lower_32_bits(value), 0xFFFFF000));
 	POSTING_READ(fence_reg_lo);
 }
 
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index b4ab1dad0143..8621d0f5fd26 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -530,6 +530,20 @@ int intel_gvt_ggtt_index_g2h(struct intel_vgpu *vgpu, unsigned long g_index,
 int intel_gvt_ggtt_h2g_index(struct intel_vgpu *vgpu, unsigned long h_index,
 			     unsigned long *g_index);
 
+/* apply guest to host gma conversion in GM registers setting */
+static inline u64 intel_gvt_reg_g2h(struct intel_vgpu *vgpu,
+		u32 addr, u32 mask)
+{
+	u64 gma;
+
+	if (addr) {
+		intel_gvt_ggtt_gmadr_g2h(vgpu,
+				addr & mask, &gma);
+		addr = gma | (addr & (~mask));
+	}
+	return addr;
+}
+
 void intel_vgpu_init_cfg_space(struct intel_vgpu *vgpu,
 		bool primary);
 void intel_vgpu_reset_cfg_space(struct intel_vgpu *vgpu);
-- 
2.17.1