1 files changed, 77 insertions, 25 deletions

diff --git a/drivers/gpu/drm/i915/gvt/render.c b/drivers/gpu/drm/i915/gvt/render.c
index a5e11d89df2f..2ea542257f03 100644
--- a/drivers/gpu/drm/i915/gvt/render.c
+++ b/drivers/gpu/drm/i915/gvt/render.c
@@ -35,6 +35,7 @@
 
 #include "i915_drv.h"
 #include "gvt.h"
+#include "trace.h"
 
 struct render_mmio {
 	int ring_id;
@@ -206,18 +207,16 @@ static void load_mocs(struct intel_vgpu *vgpu, int ring_id)
 
 	offset.reg = regs[ring_id];
 	for (i = 0; i < 64; i++) {
-		gen9_render_mocs[ring_id][i] = I915_READ(offset);
+		gen9_render_mocs[ring_id][i] = I915_READ_FW(offset);
 		I915_WRITE(offset, vgpu_vreg(vgpu, offset));
-		POSTING_READ(offset);
 		offset.reg += 4;
 	}
 
 	if (ring_id == RCS) {
 		l3_offset.reg = 0xb020;
 		for (i = 0; i < 32; i++) {
-			gen9_render_mocs_L3[i] = I915_READ(l3_offset);
-			I915_WRITE(l3_offset, vgpu_vreg(vgpu, l3_offset));
-			POSTING_READ(l3_offset);
+			gen9_render_mocs_L3[i] = I915_READ_FW(l3_offset);
+			I915_WRITE_FW(l3_offset, vgpu_vreg(vgpu, l3_offset));
 			l3_offset.reg += 4;
 		}
 	}
@@ -241,18 +240,16 @@ static void restore_mocs(struct intel_vgpu *vgpu, int ring_id)
 
 	offset.reg = regs[ring_id];
 	for (i = 0; i < 64; i++) {
-		vgpu_vreg(vgpu, offset) = I915_READ(offset);
-		I915_WRITE(offset, gen9_render_mocs[ring_id][i]);
-		POSTING_READ(offset);
+		vgpu_vreg(vgpu, offset) = I915_READ_FW(offset);
+		I915_WRITE_FW(offset, gen9_render_mocs[ring_id][i]);
 		offset.reg += 4;
 	}
 
 	if (ring_id == RCS) {
 		l3_offset.reg = 0xb020;
 		for (i = 0; i < 32; i++) {
-			vgpu_vreg(vgpu, l3_offset) = I915_READ(l3_offset);
-			I915_WRITE(l3_offset, gen9_render_mocs_L3[i]);
-			POSTING_READ(l3_offset);
+			vgpu_vreg(vgpu, l3_offset) = I915_READ_FW(l3_offset);
+			I915_WRITE_FW(l3_offset, gen9_render_mocs_L3[i]);
 			l3_offset.reg += 4;
 		}
 	}
@@ -260,7 +257,8 @@ static void restore_mocs(struct intel_vgpu *vgpu, int ring_id)
 
 #define CTX_CONTEXT_CONTROL_VAL	0x03
 
-void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id)
+/* Switch ring mmio values (context) from host to a vgpu. */
+static void switch_mmio_to_vgpu(struct intel_vgpu *vgpu, int ring_id)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 	struct render_mmio *mmio;
@@ -270,6 +268,7 @@ void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id)
 	u32 ctx_ctrl = reg_state[CTX_CONTEXT_CONTROL_VAL];
 	u32 inhibit_mask =
 		_MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
+	i915_reg_t last_reg = _MMIO(0);
 
 	if (IS_SKYLAKE(vgpu->gvt->dev_priv)
 		|| IS_KABYLAKE(vgpu->gvt->dev_priv)) {
@@ -285,7 +284,7 @@ void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id)
 		if (mmio->ring_id != ring_id)
 			continue;
 
-		mmio->value = I915_READ(mmio->reg);
+		mmio->value = I915_READ_FW(mmio->reg);
 
 		/*
 		 * if it is an inhibit context, load in_context mmio
@@ -302,20 +301,27 @@ void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id)
 		else
 			v = vgpu_vreg(vgpu, mmio->reg);
 
-		I915_WRITE(mmio->reg, v);
-		POSTING_READ(mmio->reg);
+		I915_WRITE_FW(mmio->reg, v);
+		last_reg = mmio->reg;
 
-		gvt_dbg_render("load reg %x old %x new %x\n",
-				i915_mmio_reg_offset(mmio->reg),
-				mmio->value, v);
+		trace_render_mmio(vgpu->id, "load",
+				  i915_mmio_reg_offset(mmio->reg),
+				  mmio->value, v);
 	}
+
+	/* Make sure the swiched MMIOs has taken effect. */
+	if (likely(INTEL_GVT_MMIO_OFFSET(last_reg)))
+		I915_READ_FW(last_reg);
+
 	handle_tlb_pending_event(vgpu, ring_id);
 }
 
-void intel_gvt_restore_render_mmio(struct intel_vgpu *vgpu, int ring_id)
+/* Switch ring mmio values (context) from vgpu to host. */
+static void switch_mmio_to_host(struct intel_vgpu *vgpu, int ring_id)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 	struct render_mmio *mmio;
+	i915_reg_t last_reg = _MMIO(0);
 	u32 v;
 	int i, array_size;
 
@@ -332,7 +338,7 @@ void intel_gvt_restore_render_mmio(struct intel_vgpu *vgpu, int ring_id)
 		if (mmio->ring_id != ring_id)
 			continue;
 
-		vgpu_vreg(vgpu, mmio->reg) = I915_READ(mmio->reg);
+		vgpu_vreg(vgpu, mmio->reg) = I915_READ_FW(mmio->reg);
 
 		if (mmio->mask) {
 			vgpu_vreg(vgpu, mmio->reg) &= ~(mmio->mask << 16);
@@ -343,11 +349,57 @@ void intel_gvt_restore_render_mmio(struct intel_vgpu *vgpu, int ring_id)
 		if (mmio->in_context)
 			continue;
 
-		I915_WRITE(mmio->reg, v);
-		POSTING_READ(mmio->reg);
+		I915_WRITE_FW(mmio->reg, v);
+		last_reg = mmio->reg;
 
-		gvt_dbg_render("restore reg %x old %x new %x\n",
-				i915_mmio_reg_offset(mmio->reg),
-				mmio->value, v);
+		trace_render_mmio(vgpu->id, "restore",
+				  i915_mmio_reg_offset(mmio->reg),
+				  mmio->value, v);
 	}
+
+	/* Make sure the swiched MMIOs has taken effect. */
+	if (likely(INTEL_GVT_MMIO_OFFSET(last_reg)))
+		I915_READ_FW(last_reg);
+}
+
+/**
+ * intel_gvt_switch_render_mmio - switch mmio context of specific engine
+ * @pre: the last vGPU that own the engine
+ * @next: the vGPU to switch to
+ * @ring_id: specify the engine
+ *
+ * If pre is null indicates that host own the engine. If next is null
+ * indicates that we are switching to host workload.
+ */
+void intel_gvt_switch_mmio(struct intel_vgpu *pre,
+			   struct intel_vgpu *next, int ring_id)
+{
+	struct drm_i915_private *dev_priv;
+
+	if (WARN_ON(!pre && !next))
+		return;
+
+	gvt_dbg_render("switch ring %d from %s to %s\n", ring_id,
+		       pre ? "vGPU" : "host", next ? "vGPU" : "HOST");
+
+	dev_priv = pre ? pre->gvt->dev_priv : next->gvt->dev_priv;
+
+	/**
+	 * We are using raw mmio access wrapper to improve the
+	 * performace for batch mmio read/write, so we need
+	 * handle forcewake mannually.
+	 */
+	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+
+	/**
+	 * TODO: Optimize for vGPU to vGPU switch by merging
+	 * switch_mmio_to_host() and switch_mmio_to_vgpu().
+	 */
+	if (pre)
+		switch_mmio_to_host(pre, ring_id);
+
+	if (next)
+		switch_mmio_to_vgpu(next, ring_id);
+
+	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 }