From: Changbin Du <changbin.du@intel.com>
Date: Tue, 15 May 2018 10:35:38 +0800
Subject: drm/i915/gvt: Add GTT clear_pse operation
Git-commit: c3e697635fcc9173e1d7116d9ebfd2fd0887177d
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Add clear_pse operation in case we need to split huge gtt into small pages.

v2: correct description.

Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c |   19 +++++++++++++++++++
 drivers/gpu/drm/i915/gvt/gtt.h |    1 +
 2 files changed, 20 insertions(+)

--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -390,6 +390,24 @@ static bool gen8_gtt_test_pse(struct int
 	return !!(e->val64 & _PAGE_PSE);
 }
 
+static void gen8_gtt_clear_pse(struct intel_gvt_gtt_entry *e)
+{
+	if (gen8_gtt_test_pse(e)) {
+		switch (e->type) {
+		case GTT_TYPE_PPGTT_PTE_2M_ENTRY:
+			e->val64 &= ~_PAGE_PSE;
+			e->type = GTT_TYPE_PPGTT_PDE_ENTRY;
+			break;
+		case GTT_TYPE_PPGTT_PTE_1G_ENTRY:
+			e->type = GTT_TYPE_PPGTT_PDP_ENTRY;
+			e->val64 &= ~_PAGE_PSE;
+			break;
+		default:
+			WARN_ON(1);
+		}
+	}
+}
+
 static bool gen8_gtt_test_ips(struct intel_gvt_gtt_entry *e)
 {
 	if (GEM_WARN_ON(e->type != GTT_TYPE_PPGTT_PDE_ENTRY))
@@ -477,6 +495,7 @@ static struct intel_gvt_gtt_pte_ops gen8
 	.set_present = gtt_entry_set_present,
 	.test_present = gen8_gtt_test_present,
 	.test_pse = gen8_gtt_test_pse,
+	.clear_pse = gen8_gtt_clear_pse,
 	.clear_ips = gen8_gtt_clear_ips,
 	.test_ips = gen8_gtt_test_ips,
 	.clear_64k_splited = gen8_gtt_clear_64k_splited,
--- a/drivers/gpu/drm/i915/gvt/gtt.h
+++ b/drivers/gpu/drm/i915/gvt/gtt.h
@@ -63,6 +63,7 @@ struct intel_gvt_gtt_pte_ops {
 	void (*clear_present)(struct intel_gvt_gtt_entry *e);
 	void (*set_present)(struct intel_gvt_gtt_entry *e);
 	bool (*test_pse)(struct intel_gvt_gtt_entry *e);
+	void (*clear_pse)(struct intel_gvt_gtt_entry *e);
 	bool (*test_ips)(struct intel_gvt_gtt_entry *e);
 	void (*clear_ips)(struct intel_gvt_gtt_entry *e);
 	bool (*test_64k_splited)(struct intel_gvt_gtt_entry *e);