[RFC 23/29] drm/i915: gvt: Introduce GVT control interface

[Zhi Wang <zhi.a.wang@intel.com>]

From: Yi Sun <yi.sun@intel.com>

This patch introduces the control interface for creating/destroying vGPUs.

Signed-off-by: Yi Sun <yi.sun@intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
---
 drivers/gpu/drm/i915/gvt/Makefile  |   2 +-
 drivers/gpu/drm/i915/gvt/control.c | 181 +++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/gvt/gvt.c     |   4 +
 drivers/gpu/drm/i915/gvt/gvt.h     |   8 ++
 4 files changed, 194 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/i915/gvt/control.c

diff --git a/drivers/gpu/drm/i915/gvt/Makefile b/drivers/gpu/drm/i915/gvt/Makefile
index c146c57..8874fe0 100644
--- a/drivers/gpu/drm/i915/gvt/Makefile
+++ b/drivers/gpu/drm/i915/gvt/Makefile
@@ -1,6 +1,6 @@
 GVT_SOURCE := gvt.o params.o aperture_gm.o mmio.o handlers.o instance.o \
 		trace_points.o interrupt.o gtt.o cfg_space.o opregion.o utility.o \
-		fb_decoder.o display.o edid.o
+		fb_decoder.o display.o edid.o control.o
 
 ccflags-y			+= -I$(src) -I$(src)/.. -Wall -Werror -Wno-unused-function
 i915_gvt-y			:= $(GVT_SOURCE)
diff --git a/drivers/gpu/drm/i915/gvt/control.c b/drivers/gpu/drm/i915/gvt/control.c
new file mode 100644
index 0000000..625d213
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/control.c
@@ -0,0 +1,181 @@
+/*
+ * 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.
+ */
+
+#include "gvt.h"
+
+#define GVT_TYPE (';')
+#define GVT_BASE 0xA0
+
+#define GVT_CREATE_INSTANCE _IOW(GVT_TYPE, GVT_BASE + 0, struct gvt_instance_info)
+#define GVT_DESTROY_INSTANCE _IOW(GVT_TYPE, GVT_BASE + 1, s32)
+
+struct misc_device_client_info {
+	struct pgt_device *pdev;
+	struct vgt_device *vgt;
+	struct mutex lock;
+};
+
+static int misc_device_open(struct inode *inode, struct file *filp)
+{
+	struct miscdevice *dev = filp->private_data;
+	struct pgt_device *pdev = container_of(dev, struct pgt_device, control.misc_device);
+	struct misc_device_client_info *info = NULL;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		gvt_err("fail to allocate memory");
+		return -ENOMEM;
+	}
+
+	info->pdev = pdev;
+	mutex_init(&info->lock);
+
+	filp->private_data = info;
+
+	return 0;
+}
+
+static int misc_device_close(struct inode *inode, struct file *filp)
+{
+	struct misc_device_client_info *info = filp->private_data;
+
+	if (info->vgt)
+		gvt_destroy_instance(info->vgt);
+
+	kfree(info);
+	filp->private_data = NULL;
+	return 0;
+}
+
+static long misc_device_ioctl(struct file *filp,
+		unsigned int cmd, unsigned long arg)
+{
+	struct misc_device_client_info *info = filp->private_data;
+	struct gvt_instance_info param;
+	int r = 0;
+
+	if (copy_from_user(&param, (void *)arg, sizeof(param)))
+		return -EFAULT;
+
+	mutex_lock(&info->lock);
+	switch(cmd) {
+		case GVT_CREATE_INSTANCE:
+			if (info->vgt) {
+				gvt_err("instance has already been created");
+				r = -EEXIST;
+				goto out;
+			}
+
+			info->vgt = gvt_create_instance(info->pdev, &param);
+
+			if (!info->vgt) {
+				gvt_err("fail to create instance");
+				r = -ENOMEM;
+				goto out;
+			}
+			break;
+		case GVT_DESTROY_INSTANCE:
+			if (!info->vgt) {
+				r = -ENODEV;
+				goto out;
+			}
+			gvt_destroy_instance(info->vgt);
+			info->vgt = NULL;
+			break;
+		default:
+			r = -EINVAL;
+			goto out;
+	}
+out:
+	mutex_unlock(&info->lock);
+	return r;
+}
+
+static struct file_operations misc_device_fops =
+{
+	.open = misc_device_open,
+	.release = misc_device_close,
+	.unlocked_ioctl = misc_device_ioctl,
+	.compat_ioctl = misc_device_ioctl,
+};
+
+void clean_misc_device(struct pgt_device *pdev)
+{
+	struct miscdevice *dev = &pdev->control.misc_device;
+
+	if (!list_empty(&dev->list))
+		misc_deregister(dev);
+
+	if (dev->name) {
+		kfree(dev->name);
+		dev->name = NULL;
+	}
+}
+
+bool setup_misc_device(struct pgt_device *pdev)
+{
+	struct miscdevice *dev = &pdev->control.misc_device;
+	unsigned long len;
+	char name[32];
+
+	len = snprintf(name, 32, "dri/gvt%d", pdev->id);
+	dev->name = kzalloc(len + 1, GFP_KERNEL);
+	if (!dev->name) {
+		gvt_err("fail to allocate memory");
+		return false;
+	}
+
+	dev->name = name;
+	dev->minor = MISC_DYNAMIC_MINOR;
+	dev->fops = &misc_device_fops;
+
+	INIT_LIST_HEAD(&dev->list);
+
+	if (misc_register(dev) < 0) {
+		gvt_err("fail to register miscdevice");
+		goto err;
+	}
+
+	return true;
+err:
+	clean_misc_device(pdev);
+	return false;
+}
+
+bool gvt_setup_control_interface(struct pgt_device *pdev)
+{
+	bool r;
+
+	r = setup_misc_device(pdev);
+	if (!r) {
+		gvt_err("fail to setup misc device node\n");
+		return false;
+	}
+
+	return true;
+}
+
+void gvt_clean_control_interface(struct pgt_device *pdev)
+{
+	clean_misc_device(pdev);
+}
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index ea871cd..77fe5d39 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -283,6 +283,7 @@ static bool init_service_thread(struct pgt_device *pdev)
 static void clean_pgt_device(struct pgt_device *pdev)
 {
 	clean_service_thread(pdev);
+	gvt_clean_control_interface(pdev);
 	gvt_clean_gtt(pdev);
 	gvt_irq_exit(pdev);
 	gvt_clean_mmio_emulation_state(pdev);
@@ -315,6 +316,9 @@ static bool init_pgt_device(struct pgt_device *pdev, struct drm_i915_private *de
 	if (!gvt_init_gtt(pdev))
 		goto err;
 
+	if (!gvt_setup_control_interface(pdev))
+		goto err;
+
 	if (!init_service_thread(pdev))
 		goto err;
 
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index b44b5b5..1d5c15c 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -163,6 +163,10 @@ struct gvt_gm_allocator {
 	struct drm_mm high_gm;
 };
 
+struct gvt_device_control {
+	struct miscdevice misc_device;
+};
+
 struct pgt_device {
 	struct mutex lock;
 	int id;
@@ -214,6 +218,7 @@ struct pgt_device {
 	struct pgt_statistics stat;
 
 	struct gvt_gtt_info gtt;
+	struct gvt_device_control control;
 };
 
 /* request types to wake up main thread */
@@ -688,6 +693,9 @@ bool register_mmio_handler(struct pgt_device *pdev, unsigned int start, int byte
 bool gvt_update_display_events_emulation(struct pgt_device *pdev);
 void gvt_emulate_display_events(struct pgt_device *pdev);
 
+bool gvt_setup_control_interface(struct pgt_device *pdev);
+void gvt_clean_control_interface(struct pgt_device *pdev);
+
 #include "mpt.h"
 
 #endif
-- 
1.9.1

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