[PATCH v4 5/8] drm/i915/gvt: GVTg handle pv_caps PVINFO register

[Xiaolin Zhang <xiaolin.zhang@intel.com>]

implement pv_caps PVINFO register handler in GVTg to
control different level pv optimization within guest.

report VGT_CAPS_PV capability in pvinfo page for guest.

v0: RFC
v1: rebase
v2: rebase
v3: renamed enable_pvmmio to pvmmio_caps which is used for host
pv caps.
v4: renamed pvmmio_caps to pv_caps

Signed-off-by: Xiaolin Zhang <xiaolin.zhang@intel.com>
---
 drivers/gpu/drm/i915/gvt/handlers.c | 4 ++++
 drivers/gpu/drm/i915/gvt/vgpu.c     | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 63418c8..0333652 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -1167,6 +1167,7 @@ static int pvinfo_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
 		break;
 	case 0x78010:	/* vgt_caps */
 	case 0x7881c:
+	case _vgtif_reg(pv_caps):
 		break;
 	default:
 		invalid_read = true;
@@ -1240,6 +1241,9 @@ 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(pv_caps):
+		DRM_INFO("vgpu id=%d pv caps =0x%x\n", vgpu->id, data);
+		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 314e401..9c9a192 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -47,6 +47,7 @@ void populate_pvinfo_page(struct intel_vgpu *vgpu)
 	vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) = VGT_CAPS_FULL_PPGTT;
 	vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HWSP_EMULATION;
 	vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_HUGE_GTT;
+	vgpu_vreg_t(vgpu, vgtif_reg(vgt_caps)) |= VGT_CAPS_PV;
 
 	vgpu_vreg_t(vgpu, vgtif_reg(avail_rs.mappable_gmadr.base)) =
 		vgpu_aperture_gmadr_base(vgpu);
@@ -531,6 +532,7 @@ 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 pv_caps = vgpu_vreg_t(vgpu, vgtif_reg(pv_caps));
 
 	gvt_dbg_core("------------------------------------------\n");
 	gvt_dbg_core("resseting vgpu%d, dmlr %d, engine_mask %08x\n",
@@ -562,6 +564,7 @@ void intel_gvt_reset_vgpu_locked(struct intel_vgpu *vgpu, bool dmlr,
 
 		intel_vgpu_reset_mmio(vgpu, dmlr);
 		populate_pvinfo_page(vgpu);
+		vgpu_vreg_t(vgpu, vgtif_reg(pv_caps)) = pv_caps;
 		intel_vgpu_reset_display(vgpu);
 
 		if (dmlr) {
-- 
2.7.4

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