[RFC 6/7] drm/i915/gvt: Introduce virtual private PAT support

[Zhi Wang <zhi.a.wang@xxxxxxxxx>]

Introduce PPAT MMIO handlers. The mapping between virtual PPAT indexes
and physical PPAT indexes needs to be re-built after a guest write its
virtual PPAT configuration.

Signed-off-by: Zhi Wang <zhi.a.wang@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gvt/gtt.c      | 26 ++++++++++++++++++++++++++
 drivers/gpu/drm/i915/gvt/gtt.h      |  4 +++-
 drivers/gpu/drm/i915/gvt/handlers.c | 16 ++++++++++++++--
 3 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 1d7077d..6ec2a03 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -2374,6 +2374,32 @@ static void put_private_pat_index(struct intel_gvt *gvt, unsigned int index)
 		set_bit(index, gtt->avail_ppat_bitmap);
 }
 
+int intel_vgpu_update_virtual_ppat(struct intel_vgpu *vgpu)
+{
+	struct intel_gvt *gvt = vgpu->gvt;
+	struct intel_gvt_gtt_pat_ops *ops = gvt->gtt.pat_ops;
+	struct intel_vgpu_gtt *gtt = &vgpu->gtt;
+	unsigned int value;
+	void *mem = &vgpu_vreg(vgpu, GEN8_PRIVATE_PAT_LO);
+	int i;
+
+	if (gtt->ppat_configured) {
+		/* Release all indexes first */
+		for (i = 0; i < gvt->gtt.max_ppat_index; i++)
+			put_private_pat_index(gvt, gtt->ppat_index[i]);
+	}
+
+	for (i = 0; i < gvt->gtt.max_ppat_index; i++) {
+		value = ops->get_pat_value(mem, i, NULL);
+		gtt->ppat_index[i] = get_private_pat_index(gvt, value);
+	}
+
+	retire_vgpu_ppgtt_mm(vgpu);
+
+	gtt->ppat_configured = true;
+	return 0;
+}
+
 /**
  * intel_vgpu_find_ppgtt_mm - find a PPGTT mm object
  * @vgpu: a vGPU
diff --git a/drivers/gpu/drm/i915/gvt/gtt.h b/drivers/gpu/drm/i915/gvt/gtt.h
index a83d1f0..ab3e771 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.h
+++ b/drivers/gpu/drm/i915/gvt/gtt.h
@@ -223,7 +223,8 @@ struct intel_vgpu_gtt {
 	struct list_head oos_page_list_head;
 	struct list_head post_shadow_list_head;
 	struct intel_vgpu_scratch_pt scratch_pt[GTT_TYPE_MAX];
-
+	bool ppat_configured;
+	unsigned int ppat_index[MAX_PPAT_INDEX];
 };
 
 extern int intel_vgpu_init_gtt(struct intel_vgpu *vgpu);
@@ -234,6 +235,7 @@ extern int intel_gvt_init_gtt(struct intel_gvt *gvt);
 void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu);
 extern void intel_gvt_clean_gtt(struct intel_gvt *gvt);
 
+extern int intel_vgpu_update_virtual_ppat(struct intel_vgpu *vgpu);
 extern struct intel_vgpu_mm *intel_gvt_find_ppgtt_mm(struct intel_vgpu *vgpu,
 		int page_table_level, void *root_entry);
 
diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 825abfc..e07264f 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -1369,6 +1369,18 @@ static int mailbox_write(struct intel_vgpu *vgpu, unsigned int offset,
 	return intel_vgpu_default_mmio_write(vgpu, offset, &value, bytes);
 }
 
+static int gen8_ppat_write(struct intel_vgpu *vgpu, unsigned int offset,
+		void *p_data, unsigned int bytes)
+{
+	int ret;
+
+	ret = intel_vgpu_default_mmio_write(vgpu, offset, p_data, bytes);
+	if (ret)
+		return ret;
+
+	return intel_vgpu_update_virtual_ppat(vgpu);
+}
+
 static int skl_power_well_ctl_write(struct intel_vgpu *vgpu,
 		unsigned int offset, void *p_data, unsigned int bytes)
 {
@@ -2543,8 +2555,8 @@ static int init_broadwell_mmio_info(struct intel_gvt *gvt)
 
 	MMIO_DH(GEN6_PCODE_MAILBOX, D_BDW_PLUS, NULL, mailbox_write);
 
-	MMIO_D(GEN8_PRIVATE_PAT_LO, D_BDW_PLUS);
-	MMIO_D(GEN8_PRIVATE_PAT_HI, D_BDW_PLUS);
+	MMIO_DH(GEN8_PRIVATE_PAT_LO, D_BDW_PLUS, NULL, gen8_ppat_write);
+	MMIO_DH(GEN8_PRIVATE_PAT_HI, D_BDW_PLUS, NULL, gen8_ppat_write);
 
 	MMIO_D(GAMTARBMODE, D_BDW_PLUS);
 
-- 
2.7.4

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