drm/i915/gvt: vGPU context switch

As different VM may configure different render MMIOs when executing
workload, to schedule workloads between different VM, the render MMIOs
have to be switched.
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

drivers/gpu/drm/i915/gvt/Makefile

 GVT_DIR := gvt
 GVT_SOURCE := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o firmware.o \
 	interrupt.o gtt.o cfg_space.o opregion.o mmio.o display.o edid.o \
-	execlist.o scheduler.o sched_policy.o
+	execlist.o scheduler.o sched_policy.o render.o
 
 ccflags-y                      += -I$(src) -I$(src)/$(GVT_DIR) -Wall
 i915-y			       += $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))

drivers/gpu/drm/i915/gvt/debug.h

@@ -48,4 +48,7 @@
 #define gvt_dbg_sched(fmt, args...) \
 	DRM_DEBUG_DRIVER("gvt: sched: "fmt, ##args)
 
+#define gvt_dbg_render(fmt, args...) \
+	DRM_DEBUG_DRIVER("gvt: render: "fmt, ##args)
+
 #endif

drivers/gpu/drm/i915/gvt/gvt.h

@@ -44,6 +44,7 @@
 #include "execlist.h"
 #include "scheduler.h"
 #include "sched_policy.h"
+#include "render.h"
 
 #define GVT_MAX_VGPU 8
 
@@ -154,6 +155,7 @@ struct intel_vgpu {
 	struct list_head workload_q_head[I915_NUM_ENGINES];
 	struct kmem_cache *workloads;
 	atomic_t running_workload_num;
+	DECLARE_BITMAP(tlb_handle_pending, I915_NUM_ENGINES);
 	struct i915_gem_context *shadow_ctx;
 	struct notifier_block shadow_ctx_notifier_block;
 };

drivers/gpu/drm/i915/gvt/handlers.c

@@ -1340,6 +1340,37 @@ static int ring_mode_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 	return 0;
 }
 
+static int gvt_reg_tlb_control_handler(struct intel_vgpu *vgpu,
+		unsigned int offset, void *p_data, unsigned int bytes)
+{
+	int rc = 0;
+	unsigned int id = 0;
+
+	switch (offset) {
+	case 0x4260:
+		id = RCS;
+		break;
+	case 0x4264:
+		id = VCS;
+		break;
+	case 0x4268:
+		id = VCS2;
+		break;
+	case 0x426c:
+		id = BCS;
+		break;
+	case 0x4270:
+		id = VECS;
+		break;
+	default:
+		rc = -EINVAL;
+		break;
+	}
+	set_bit(id, (void *)vgpu->tlb_handle_pending);
+
+	return rc;
+}
+
 #define MMIO_F(reg, s, f, am, rm, d, r, w) do { \
 	ret = new_mmio_info(gvt, INTEL_GVT_MMIO_OFFSET(reg), \
 		f, s, am, rm, d, r, w); \
@@ -2147,11 +2178,11 @@ static int init_generic_mmio_info(struct intel_gvt *gvt)
 	MMIO_F(CL_PRIMITIVES_COUNT, 8, 0, 0, 0, D_ALL, NULL, NULL);
 	MMIO_F(PS_INVOCATION_COUNT, 8, 0, 0, 0, D_ALL, NULL, NULL);
 	MMIO_F(PS_DEPTH_COUNT, 8, 0, 0, 0, D_ALL, NULL, NULL);
-	MMIO_DH(0x4260, D_BDW_PLUS, NULL, NULL);
-	MMIO_DH(0x4264, D_BDW_PLUS, NULL, NULL);
-	MMIO_DH(0x4268, D_BDW_PLUS, NULL, NULL);
-	MMIO_DH(0x426c, D_BDW_PLUS, NULL, NULL);
-	MMIO_DH(0x4270, D_BDW_PLUS, NULL, NULL);
+	MMIO_DH(0x4260, D_BDW_PLUS, NULL, gvt_reg_tlb_control_handler);
+	MMIO_DH(0x4264, D_BDW_PLUS, NULL, gvt_reg_tlb_control_handler);
+	MMIO_DH(0x4268, D_BDW_PLUS, NULL, gvt_reg_tlb_control_handler);
+	MMIO_DH(0x426c, D_BDW_PLUS, NULL, gvt_reg_tlb_control_handler);
+	MMIO_DH(0x4270, D_BDW_PLUS, NULL, gvt_reg_tlb_control_handler);
 	MMIO_DFH(0x4094, D_BDW_PLUS, F_CMD_ACCESS, NULL, NULL);
 
 	return 0;

drivers/gpu/drm/i915/gvt/render.c

+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *    Eddie Dong <eddie.dong@intel.com>
+ *    Kevin Tian <kevin.tian@intel.com>
+ *
+ * Contributors:
+ *    Zhi Wang <zhi.a.wang@intel.com>
+ *    Changbin Du <changbin.du@intel.com>
+ *    Zhenyu Wang <zhenyuw@linux.intel.com>
+ *    Tina Zhang <tina.zhang@intel.com>
+ *    Bing Niu <bing.niu@intel.com>
+ *
+ */
+
+#include "i915_drv.h"
+
+struct render_mmio {
+	int ring_id;
+	i915_reg_t reg;
+	u32 mask;
+	bool in_context;
+	u32 value;
+};
+
+static struct render_mmio gen8_render_mmio_list[] = {
+	{RCS, _MMIO(0x229c), 0xffff, false},
+	{RCS, _MMIO(0x2248), 0x0, false},
+	{RCS, _MMIO(0x2098), 0x0, false},
+	{RCS, _MMIO(0x20c0), 0xffff, true},
+	{RCS, _MMIO(0x24d0), 0, false},
+	{RCS, _MMIO(0x24d4), 0, false},
+	{RCS, _MMIO(0x24d8), 0, false},
+	{RCS, _MMIO(0x24dc), 0, false},
+	{RCS, _MMIO(0x7004), 0xffff, true},
+	{RCS, _MMIO(0x7008), 0xffff, true},
+	{RCS, _MMIO(0x7000), 0xffff, true},
+	{RCS, _MMIO(0x7010), 0xffff, true},
+	{RCS, _MMIO(0x7300), 0xffff, true},
+	{RCS, _MMIO(0x83a4), 0xffff, true},
+
+	{BCS, _MMIO(0x2229c), 0xffff, false},
+	{BCS, _MMIO(0x2209c), 0xffff, false},
+	{BCS, _MMIO(0x220c0), 0xffff, false},
+	{BCS, _MMIO(0x22098), 0x0, false},
+	{BCS, _MMIO(0x22028), 0x0, false},
+};
+
+static struct render_mmio gen9_render_mmio_list[] = {
+	{RCS, _MMIO(0x229c), 0xffff, false},
+	{RCS, _MMIO(0x2248), 0x0, false},
+	{RCS, _MMIO(0x2098), 0x0, false},
+	{RCS, _MMIO(0x20c0), 0xffff, true},
+	{RCS, _MMIO(0x24d0), 0, false},
+	{RCS, _MMIO(0x24d4), 0, false},
+	{RCS, _MMIO(0x24d8), 0, false},
+	{RCS, _MMIO(0x24dc), 0, false},
+	{RCS, _MMIO(0x7004), 0xffff, true},
+	{RCS, _MMIO(0x7008), 0xffff, true},
+	{RCS, _MMIO(0x7000), 0xffff, true},
+	{RCS, _MMIO(0x7010), 0xffff, true},
+	{RCS, _MMIO(0x7300), 0xffff, true},
+	{RCS, _MMIO(0x83a4), 0xffff, true},
+
+	{RCS, _MMIO(0x40e0), 0, false},
+	{RCS, _MMIO(0x40e4), 0, false},
+	{RCS, _MMIO(0x2580), 0xffff, true},
+	{RCS, _MMIO(0x7014), 0xffff, true},
+	{RCS, _MMIO(0x20ec), 0xffff, false},
+	{RCS, _MMIO(0xb118), 0, false},
+	{RCS, _MMIO(0xe100), 0xffff, true},
+	{RCS, _MMIO(0xe180), 0xffff, true},
+	{RCS, _MMIO(0xe184), 0xffff, true},
+	{RCS, _MMIO(0xe188), 0xffff, true},
+	{RCS, _MMIO(0xe194), 0xffff, true},
+	{RCS, _MMIO(0x4de0), 0, false},
+	{RCS, _MMIO(0x4de4), 0, false},
+	{RCS, _MMIO(0x4de8), 0, false},
+	{RCS, _MMIO(0x4dec), 0, false},
+	{RCS, _MMIO(0x4df0), 0, false},
+	{RCS, _MMIO(0x4df4), 0, false},
+
+	{BCS, _MMIO(0x2229c), 0xffff, false},
+	{BCS, _MMIO(0x2209c), 0xffff, false},
+	{BCS, _MMIO(0x220c0), 0xffff, false},
+	{BCS, _MMIO(0x22098), 0x0, false},
+	{BCS, _MMIO(0x22028), 0x0, false},
+
+	{VCS2, _MMIO(0x1c028), 0xffff, false},
+
+	{VECS, _MMIO(0x1a028), 0xffff, false},
+};
+
+static u32 gen9_render_mocs[I915_NUM_ENGINES][64];
+static u32 gen9_render_mocs_L3[32];
+
+static void handle_tlb_pending_event(struct intel_vgpu *vgpu, int ring_id)
+{
+	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+	i915_reg_t reg;
+	u32 regs[] = {
+		[RCS] = 0x4260,
+		[VCS] = 0x4264,
+		[VCS2] = 0x4268,
+		[BCS] = 0x426c,
+		[VECS] = 0x4270,
+	};
+
+	if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
+		return;
+
+	if (!test_and_clear_bit(ring_id, (void *)vgpu->tlb_handle_pending))
+		return;
+
+	reg = _MMIO(regs[ring_id]);
+
+	I915_WRITE(reg, 0x1);
+
+	if (wait_for_atomic((I915_READ(reg) == 0), 50))
+		gvt_err("timeout in invalidate ring (%d) tlb\n", ring_id);
+
+	gvt_dbg_core("invalidate TLB for ring %d\n", ring_id);
+}
+
+static void load_mocs(struct intel_vgpu *vgpu, int ring_id)
+{
+	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+	i915_reg_t offset, l3_offset;
+	u32 regs[] = {
+		[RCS] = 0xc800,
+		[VCS] = 0xc900,
+		[VCS2] = 0xca00,
+		[BCS] = 0xcc00,
+		[VECS] = 0xcb00,
+	};
+	int i;
+
+	if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
+		return;
+
+	if (!IS_SKYLAKE(dev_priv))
+		return;
+
+	for (i = 0; i < 64; i++) {
+		gen9_render_mocs[ring_id][i] = I915_READ(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, offset));
+			POSTING_READ(l3_offset);
+			l3_offset.reg += 4;
+		}
+	}
+}
+
+static void restore_mocs(struct intel_vgpu *vgpu, int ring_id)
+{
+	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+	i915_reg_t offset, l3_offset;
+	u32 regs[] = {
+		[RCS] = 0xc800,
+		[VCS] = 0xc900,
+		[VCS2] = 0xca00,
+		[BCS] = 0xcc00,
+		[VECS] = 0xcb00,
+	};
+	int i;
+
+	if (WARN_ON(ring_id >= ARRAY_SIZE(regs)))
+		return;
+
+	if (!IS_SKYLAKE(dev_priv))
+		return;
+
+	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);
+		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);
+			l3_offset.reg += 4;
+		}
+	}
+}
+
+void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id)
+{
+	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+	struct render_mmio *mmio;
+	u32 v;
+	int i, array_size;
+
+	if (IS_SKYLAKE(vgpu->gvt->dev_priv)) {
+		mmio = gen9_render_mmio_list;
+		array_size = ARRAY_SIZE(gen9_render_mmio_list);
+		load_mocs(vgpu, ring_id);
+	} else {
+		mmio = gen8_render_mmio_list;
+		array_size = ARRAY_SIZE(gen8_render_mmio_list);
+	}
+
+	for (i = 0; i < array_size; i++, mmio++) {
+		if (mmio->ring_id != ring_id)
+			continue;
+
+		mmio->value = I915_READ(mmio->reg);
+		if (mmio->mask)
+			v = vgpu_vreg(vgpu, mmio->reg) | (mmio->mask << 16);
+		else
+			v = vgpu_vreg(vgpu, mmio->reg);
+
+		I915_WRITE(mmio->reg, v);
+		POSTING_READ(mmio->reg);
+
+		gvt_dbg_render("load reg %x old %x new %x\n",
+				i915_mmio_reg_offset(mmio->reg),
+				mmio->value, v);
+	}
+	handle_tlb_pending_event(vgpu, ring_id);
+}
+
+void intel_gvt_restore_render_mmio(struct intel_vgpu *vgpu, int ring_id)
+{
+	struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
+	struct render_mmio *mmio;
+	u32 v;
+	int i, array_size;
+
+	if (IS_SKYLAKE(dev_priv)) {
+		mmio = gen9_render_mmio_list;
+		array_size = ARRAY_SIZE(gen9_render_mmio_list);
+		restore_mocs(vgpu, ring_id);
+	} else {
+		mmio = gen8_render_mmio_list;
+		array_size = ARRAY_SIZE(gen8_render_mmio_list);
+	}
+
+	for (i = 0; i < array_size; i++, mmio++) {
+		if (mmio->ring_id != ring_id)
+			continue;
+
+		vgpu_vreg(vgpu, mmio->reg) = I915_READ(mmio->reg);
+
+		if (mmio->mask) {
+			vgpu_vreg(vgpu, mmio->reg) &= ~(mmio->mask << 16);
+			v = mmio->value | (mmio->mask << 16);
+		} else
+			v = mmio->value;
+
+		I915_WRITE(mmio->reg, v);
+		POSTING_READ(mmio->reg);
+
+		gvt_dbg_render("restore reg %x old %x new %x\n",
+				i915_mmio_reg_offset(mmio->reg),
+				mmio->value, v);
+	}
+}

drivers/gpu/drm/i915/gvt/render.h

+/*
+ * Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *    Eddie Dong <eddie.dong@intel.com>
+ *    Kevin Tian <kevin.tian@intel.com>
+ *
+ * Contributors:
+ *    Zhi Wang <zhi.a.wang@intel.com>
+ *    Changbin Du <changbin.du@intel.com>
+ *    Zhenyu Wang <zhenyuw@linux.intel.com>
+ *    Tina Zhang <tina.zhang@intel.com>
+ *    Bing Niu <bing.niu@intel.com>
+ *
+ */
+
+#ifndef __GVT_RENDER_H__
+#define __GVT_RENDER_H__
+
+void intel_gvt_load_render_mmio(struct intel_vgpu *vgpu, int ring_id);
+
+void intel_gvt_restore_render_mmio(struct intel_vgpu *vgpu, int ring_id);
+
+#endif

drivers/gpu/drm/i915/gvt/scheduler.c

@@ -139,9 +139,13 @@ static int shadow_context_status_change(struct notifier_block *nb,
 
 	switch (action) {
 	case INTEL_CONTEXT_SCHEDULE_IN:
+		intel_gvt_load_render_mmio(workload->vgpu,
+					   workload->ring_id);
 		atomic_set(&workload->shadow_ctx_active, 1);
 		break;
 	case INTEL_CONTEXT_SCHEDULE_OUT:
+		intel_gvt_restore_render_mmio(workload->vgpu,
+					      workload->ring_id);
 		atomic_set(&workload->shadow_ctx_active, 0);
 		break;
 	default:

drivers/gpu/drm/i915/gvt/vgpu.c

@@ -200,6 +200,7 @@ struct intel_vgpu *intel_gvt_create_vgpu(struct intel_gvt *gvt,
 	vgpu->id = ret;
 	vgpu->handle = param->handle;
 	vgpu->gvt = gvt;
+	bitmap_zero(vgpu->tlb_handle_pending, I915_NUM_ENGINES);
 
 	setup_vgpu_cfg_space(vgpu, param);