drm/i915/gvt: Introduce a framework for tracking HW registers.

This patch introduces a framework for tracking HW registers on different GEN platforms. Accesses to GEN HW registers from VMs will be trapped by hypervisor. It will forward these emulation requests to GVT-g device model, which requires this framework to search for related register descriptions. Each MMIO entry in this framework describes a GEN HW registers, e.g. offset, length, whether it contains RO bits, whether it can be accessed by LRIs...and also emulation handlers for emulating register reading and writing. - Use i915 MMIO register definition & statement.(Joonas) Signed-off-by: Zhi Wang <zhi.a.wang@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
mariux64 · Oct 14, 2016 · 12d14cc · 12d14cc
1 parent 28a60de
commit 12d14cc
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Showing 5 changed files with 379 additions and 9 deletions.
diff --git a/drivers/gpu/drm/i915/gvt/Makefile b/drivers/gpu/drm/i915/gvt/Makefile
@@ -1,5 +1,5 @@
 GVT_DIR := gvt
-GVT_SOURCE := gvt.o aperture_gm.o
+GVT_SOURCE := gvt.o aperture_gm.o handlers.o
 
 ccflags-y                      += -I$(src) -I$(src)/$(GVT_DIR) -Wall
 i915-y			       += $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -19,6 +19,15 @@
  * 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:
+ *    Kevin Tian <kevin.tian@intel.com>
+ *    Eddie Dong <eddie.dong@intel.com>
+ *
+ * Contributors:
+ *    Niu Bing <bing.niu@intel.com>
+ *    Zhi Wang <zhi.a.wang@intel.com>
+ *
  */
 
 #include <linux/types.h>
@@ -84,9 +93,12 @@ int intel_gvt_init_host(void)
 
 static void init_device_info(struct intel_gvt *gvt)
 {
-	if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv))
-		gvt->device_info.max_support_vgpus = 8;
-	/* This function will grow large in GVT device model patches. */
+	struct intel_gvt_device_info *info = &gvt->device_info;
+
+	if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv)) {
+		info->max_support_vgpus = 8;
+		info->mmio_size = 2 * 1024 * 1024;
+	}
 }
 
 /**
@@ -104,7 +116,7 @@ void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
 	if (WARN_ON(!gvt->initialized))
 		return;
 
-	/* Other de-initialization of GVT components will be introduced. */
+	intel_gvt_clean_mmio_info(gvt);
 
 	gvt->initialized = false;
 }
@@ -123,6 +135,8 @@ void intel_gvt_clean_device(struct drm_i915_private *dev_priv)
 int intel_gvt_init_device(struct drm_i915_private *dev_priv)
 {
 	struct intel_gvt *gvt = &dev_priv->gvt;
+	int ret;
+
 	/*
 	 * Cannot initialize GVT device without intel_gvt_host gets
 	 * initialized first.
@@ -139,9 +153,11 @@ int intel_gvt_init_device(struct drm_i915_private *dev_priv)
 	gvt->dev_priv = dev_priv;
 
 	init_device_info(gvt);
-	/*
-	 * Other initialization of GVT components will be introduce here.
-	 */
+
+	ret = intel_gvt_setup_mmio_info(gvt);
+	if (ret)
+		return ret;
+
 	gvt_dbg_core("gvt device creation is done\n");
 	gvt->initialized = true;
 	return 0;

diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -19,13 +19,23 @@
  * 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:
+ *    Kevin Tian <kevin.tian@intel.com>
+ *    Eddie Dong <eddie.dong@intel.com>
+ *
+ * Contributors:
+ *    Niu Bing <bing.niu@intel.com>
+ *    Zhi Wang <zhi.a.wang@intel.com>
+ *
  */
 
 #ifndef _GVT_H_
 #define _GVT_H_
 
 #include "debug.h"
 #include "hypercall.h"
+#include "mmio.h"
 
 #define GVT_MAX_VGPU 8
 
@@ -45,7 +55,7 @@ extern struct intel_gvt_host intel_gvt_host;
 /* Describe per-platform limitations. */
 struct intel_gvt_device_info {
 	u32 max_support_vgpus;
-	/* This data structure will grow bigger in GVT device model patches */
+	u32 mmio_size;
 };
 
 /* GM resources owned by a vGPU */
@@ -83,6 +93,13 @@ struct intel_gvt_fence {
 	unsigned long vgpu_allocated_fence_num;
 };
 
+#define INTEL_GVT_MMIO_HASH_BITS 9
+
+struct intel_gvt_mmio {
+	u32 *mmio_attribute;
+	DECLARE_HASHTABLE(mmio_info_table, INTEL_GVT_MMIO_HASH_BITS);
+};
+
 struct intel_gvt {
 	struct mutex lock;
 	bool initialized;
@@ -93,6 +110,7 @@ struct intel_gvt {
 	struct intel_gvt_device_info device_info;
 	struct intel_gvt_gm gm;
 	struct intel_gvt_fence fence;
+	struct intel_gvt_mmio mmio;
 };
 
 /* Aperture/GM space definitions for GVT device */

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -0,0 +1,247 @@
+/*
+ * 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:
+ *    Kevin Tian <kevin.tian@intel.com>
+ *    Eddie Dong <eddie.dong@intel.com>
+ *    Zhiyuan Lv <zhiyuan.lv@intel.com>
+ *
+ * Contributors:
+ *    Min He <min.he@intel.com>
+ *    Tina Zhang <tina.zhang@intel.com>
+ *    Pei Zhang <pei.zhang@intel.com>
+ *    Niu Bing <bing.niu@intel.com>
+ *    Ping Gao <ping.a.gao@intel.com>
+ *    Zhi Wang <zhi.a.wang@intel.com>
+ *
+
+ */
+
+#include "i915_drv.h"
+
+/* Register contains RO bits */
+#define F_RO		(1 << 0)
+/* Register contains graphics address */
+#define F_GMADR		(1 << 1)
+/* Mode mask registers with high 16 bits as the mask bits */
+#define F_MODE_MASK	(1 << 2)
+/* This reg can be accessed by GPU commands */
+#define F_CMD_ACCESS	(1 << 3)
+/* This reg has been accessed by a VM */
+#define F_ACCESSED	(1 << 4)
+/* This reg has been accessed through GPU commands */
+#define F_CMD_ACCESSED	(1 << 5)
+/* This reg could be accessed by unaligned address */
+#define F_UNALIGN	(1 << 6)
+
+unsigned long intel_gvt_get_device_type(struct intel_gvt *gvt)
+{
+	if (IS_BROADWELL(gvt->dev_priv))
+		return D_BDW;
+	else if (IS_SKYLAKE(gvt->dev_priv))
+		return D_SKL;
+
+	return 0;
+}
+
+bool intel_gvt_match_device(struct intel_gvt *gvt,
+		unsigned long device)
+{
+	return intel_gvt_get_device_type(gvt) & device;
+}
+
+static int new_mmio_info(struct intel_gvt *gvt,
+		u32 offset, u32 flags, u32 size,
+		u32 addr_mask, u32 ro_mask, u32 device,
+		void *read, void *write)
+{
+	struct intel_gvt_mmio_info *info, *p;
+	u32 start, end, i;
+
+	if (!intel_gvt_match_device(gvt, device))
+		return 0;
+
+	if (WARN_ON(!IS_ALIGNED(offset, 4)))
+		return -EINVAL;
+
+	start = offset;
+	end = offset + size;
+
+	for (i = start; i < end; i += 4) {
+		info = kzalloc(sizeof(*info), GFP_KERNEL);
+		if (!info)
+			return -ENOMEM;
+
+		info->offset = i;
+		p = intel_gvt_find_mmio_info(gvt, info->offset);
+		if (p)
+			gvt_err("dup mmio definition offset %x\n",
+				info->offset);
+		info->size = size;
+		info->length = (i + 4) < end ? 4 : (end - i);
+		info->addr_mask = addr_mask;
+		info->device = device;
+		info->read = read;
+		info->write = write;
+		gvt->mmio.mmio_attribute[info->offset / 4] = flags;
+		INIT_HLIST_NODE(&info->node);
+		hash_add(gvt->mmio.mmio_info_table, &info->node, info->offset);
+	}
+	return 0;
+}
+
+#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); \
+	if (ret) \
+		return ret; \
+} while (0)
+
+#define MMIO_D(reg, d) \
+	MMIO_F(reg, 4, 0, 0, 0, d, NULL, NULL)
+
+#define MMIO_DH(reg, d, r, w) \
+	MMIO_F(reg, 4, 0, 0, 0, d, r, w)
+
+#define MMIO_DFH(reg, d, f, r, w) \
+	MMIO_F(reg, 4, f, 0, 0, d, r, w)
+
+#define MMIO_GM(reg, d, r, w) \
+	MMIO_F(reg, 4, F_GMADR, 0xFFFFF000, 0, d, r, w)
+
+#define MMIO_RO(reg, d, f, rm, r, w) \
+	MMIO_F(reg, 4, F_RO | f, 0, rm, d, r, w)
+
+#define MMIO_RING_F(prefix, s, f, am, rm, d, r, w) do { \
+	MMIO_F(prefix(RENDER_RING_BASE), s, f, am, rm, d, r, w); \
+	MMIO_F(prefix(BLT_RING_BASE), s, f, am, rm, d, r, w); \
+	MMIO_F(prefix(GEN6_BSD_RING_BASE), s, f, am, rm, d, r, w); \
+	MMIO_F(prefix(VEBOX_RING_BASE), s, f, am, rm, d, r, w); \
+} while (0)
+
+#define MMIO_RING_D(prefix, d) \
+	MMIO_RING_F(prefix, 4, 0, 0, 0, d, NULL, NULL)
+
+#define MMIO_RING_DFH(prefix, d, f, r, w) \
+	MMIO_RING_F(prefix, 4, f, 0, 0, d, r, w)
+
+#define MMIO_RING_GM(prefix, d, r, w) \
+	MMIO_RING_F(prefix, 4, F_GMADR, 0xFFFF0000, 0, d, r, w)
+
+#define MMIO_RING_RO(prefix, d, f, rm, r, w) \
+	MMIO_RING_F(prefix, 4, F_RO | f, 0, rm, d, r, w)
+
+static int init_generic_mmio_info(struct intel_gvt *gvt)
+{
+	int ret;
+
+	MMIO_F(0, 0, 0, 0, 0, D_ALL, NULL, NULL);
+	return 0;
+}
+
+static int init_broadwell_mmio_info(struct intel_gvt *gvt)
+{
+	int ret;
+
+	MMIO_F(0, 0, 0, 0, 0, D_ALL, NULL, NULL);
+	return 0;
+}
+
+/**
+ * intel_gvt_find_mmio_info - find MMIO information entry by aligned offset
+ * @gvt: GVT device
+ * @offset: register offset
+ *
+ * This function is used to find the MMIO information entry from hash table
+ *
+ * Returns:
+ * pointer to MMIO information entry, NULL if not exists
+ */
+struct intel_gvt_mmio_info *intel_gvt_find_mmio_info(struct intel_gvt *gvt,
+	unsigned int offset)
+{
+	struct intel_gvt_mmio_info *e;
+
+	WARN_ON(!IS_ALIGNED(offset, 4));
+
+	hash_for_each_possible(gvt->mmio.mmio_info_table, e, node, offset) {
+		if (e->offset == offset)
+			return e;
+	}
+	return NULL;
+}
+
+/**
+ * intel_gvt_clean_mmio_info - clean up MMIO information table for GVT device
+ * @gvt: GVT device
+ *
+ * This function is called at the driver unloading stage, to clean up the MMIO
+ * information table of GVT device
+ *
+ */
+void intel_gvt_clean_mmio_info(struct intel_gvt *gvt)
+{
+	struct hlist_node *tmp;
+	struct intel_gvt_mmio_info *e;
+	int i;
+
+	hash_for_each_safe(gvt->mmio.mmio_info_table, i, tmp, e, node)
+		kfree(e);
+
+	vfree(gvt->mmio.mmio_attribute);
+	gvt->mmio.mmio_attribute = NULL;
+}
+
+/**
+ * intel_gvt_setup_mmio_info - setup MMIO information table for GVT device
+ * @gvt: GVT device
+ *
+ * This function is called at the initialization stage, to setup the MMIO
+ * information table for GVT device
+ *
+ * Returns:
+ * zero on success, negative if failed.
+ */
+int intel_gvt_setup_mmio_info(struct intel_gvt *gvt)
+{
+	struct intel_gvt_device_info *info = &gvt->device_info;
+	struct drm_i915_private *dev_priv = gvt->dev_priv;
+	int ret;
+
+	gvt->mmio.mmio_attribute = vzalloc(info->mmio_size);
+	if (!gvt->mmio.mmio_attribute)
+		return -ENOMEM;
+
+	ret = init_generic_mmio_info(gvt);
+	if (ret)
+		goto err;
+
+	if (IS_BROADWELL(dev_priv)) {
+		ret = init_broadwell_mmio_info(gvt);
+		if (ret)
+			goto err;
+	}
+	return 0;
+err:
+	intel_gvt_clean_mmio_info(gvt);
+	return ret;
+}