[RFC 06/10] drm/i915/gvt: GVTg handle enable_pvmmio PVINFO register

[Xiaolin Zhang <xiaolin.zhang@xxxxxxxxx>]

implement enable_pvmmio PVINFO register handler in GVTg to
control different level pvmmio optimization within guest.

Signed-off-by: Xiaolin Zhang <xiaolin.zhang@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gvt/handlers.c | 10 ++++++++++
 drivers/gpu/drm/i915/gvt/vgpu.c     |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index d262587..36171e6 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -1241,6 +1241,16 @@ static int pvinfo_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 	case _vgtif_reg(g2v_notify):
 		ret = handle_g2v_notification(vgpu, data);
 		break;
+	case _vgtif_reg(enable_pvmmio):
+		if (i915_modparams.enable_pvmmio) {
+			vgpu_vreg(vgpu, offset) = data &
+				i915_modparams.enable_pvmmio;
+			DRM_INFO("vgpu id=%d pvmmio=0x%x\n",
+				vgpu->id, VGPU_PVMMIO(vgpu));
+		} else {
+			vgpu_vreg(vgpu, offset) = 0;
+		}
+		break;
 	/* add xhot and yhot to handled list to avoid error log */
 	case _vgtif_reg(cursor_x_hot):
 	case _vgtif_reg(cursor_y_hot):
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index a4e8e3c..1aed197 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -62,6 +62,8 @@ void populate_pvinfo_page(struct intel_vgpu *vgpu)
 	vgpu_vreg_t(vgpu, vgtif_reg(cursor_x_hot)) = UINT_MAX;
 	vgpu_vreg_t(vgpu, vgtif_reg(cursor_y_hot)) = UINT_MAX;
 
+	vgpu_vreg_t(vgpu, vgtif_reg(enable_pvmmio)) = 0;
+
 	gvt_dbg_core("Populate PVINFO PAGE for vGPU %d\n", vgpu->id);
 	gvt_dbg_core("aperture base [GMADR] 0x%llx size 0x%llx\n",
 		vgpu_aperture_gmadr_base(vgpu), vgpu_aperture_sz(vgpu));
@@ -490,6 +492,8 @@ struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
 	return vgpu;
 }
 
+#define _vgtif_reg(x) \
+	(VGT_PVINFO_PAGE + offsetof(struct vgt_if, x))
 /**
  * intel_gvt_reset_vgpu_locked - reset a virtual GPU by DMLR or GT reset
  * @vgpu: virtual GPU
@@ -524,6 +528,7 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 	struct intel_gvt *gvt = vgpu->gvt;
 	struct intel_gvt_workload_scheduler *scheduler = &gvt->scheduler;
 	unsigned int resetting_eng = dmlr ? ALL_ENGINES : engine_mask;
+	int enable_pvmmio = vgpu_vreg(vgpu, _vgtif_reg(enable_pvmmio));
 
 	gvt_dbg_core("------------------------------------------\n");
 	gvt_dbg_core("resseting vgpu%d, dmlr %d, engine_mask %08x\n",
@@ -555,6 +560,7 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 
 		intel_vgpu_reset_mmio(vgpu, dmlr);
 		populate_pvinfo_page(vgpu);
+		vgpu_vreg(vgpu, _vgtif_reg(enable_pvmmio)) = enable_pvmmio;
 		intel_vgpu_reset_display(vgpu);
 
 		if (dmlr) {
-- 
1.8.3.1

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