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Commit e546e281 authored by Tina Zhang's avatar Tina Zhang Committed by Zhenyu Wang
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drm/i915/gvt: Dmabuf support for GVT-g 



This patch introduces a guest's framebuffer sharing mechanism based on
dma-buf subsystem. With this sharing mechanism, guest's framebuffer can
be shared between guest VM and host.

v17:
- modify VFIO_DEVICE_GET_GFX_DMABUF interface. (Alex)

v16:
- add x_hot and y_hot. (Gerd)
- add flag validation for VFIO_DEVICE_GET_GFX_DMABUF. (Alex)
- rebase 4.14.0-rc6.

v15:
- add VFIO_DEVICE_GET_GFX_DMABUF ABI. (Gerd)
- add intel_vgpu_dmabuf_cleanup() to clean up the vGPU's dmabuf. (Gerd)

v14:
- add PROBE, DMABUF and REGION flags. (Alex)

v12:
- refine the lifecycle of dmabuf.

v9:
- remove dma-buf management. (Alex)
- track the dma-buf create and release in kernel mode. (Gerd) (Daniel)

v8:
- refine the dma-buf ioctl definition.(Alex)
- add a lock to protect the dmabuf list. (Alex)

v7:
- release dma-buf related allocations in dma-buf's associated release
  function. (Alex)
- refine ioctl interface for querying plane info or create dma-buf.
  (Alex)

v6:
- align the dma-buf life cycle with the vfio device. (Alex)
- add the dma-buf related operations in a separate patch. (Gerd)
- i915 related changes. (Chris)

v5:
- fix bug while checking whether the gem obj is gvt's dma-buf when user
  change caching mode or domains. Add a helper function to do it.
  (Xiaoguang)
- add definition for the query plane and create dma-buf. (Xiaoguang)

v4:
- fix bug while checking whether the gem obj is gvt's dma-buf when set
  caching mode or doamins. (Xiaoguang)

v3:
- declare a new flag I915_GEM_OBJECT_IS_GVT_DMABUF in drm_i915_gem_object
  to represent the gem obj for gvt's dma-buf. The tiling mode, caching
  mode and domains can not be changed for this kind of gem object. (Alex)
- change dma-buf related information to be more generic. So other vendor
  can use the same interface. (Alex)

v2:
- create a management fd for dma-buf operations. (Alex)
- alloc gem object's backing storage in gem obj's get_pages() callback.
  (Chris)

Signed-off-by: default avatarTina Zhang <tina.zhang@intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent e20eaa23

drivers/gpu/drm/i915/gvt/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 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 render.o cmd_parser.o debugfs.o \

	fb_decoder.o

	fb_decoder.o dmabuf.o



ccflags-y				+= -I$(src) -I$(src)/$(GVT_DIR)

i915-y					+= $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))

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

0 → 100644
+523 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2017 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:

 *    Zhiyuan Lv <zhiyuan.lv@intel.com>

 *

 * Contributors:

 *    Xiaoguang Chen

 *    Tina Zhang <tina.zhang@intel.com>

 */



#include <linux/dma-buf.h>

#include <drm/drmP.h>

#include <linux/vfio.h>



#include "i915_drv.h"

#include "gvt.h"



#define GEN8_DECODE_PTE(pte) (pte & GENMASK_ULL(63, 12))



static int vgpu_gem_get_pages(

		struct drm_i915_gem_object *obj)

{

	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);

	struct sg_table *st;

	struct scatterlist *sg;

	int i, ret;

	gen8_pte_t __iomem *gtt_entries;

	struct intel_vgpu_fb_info *fb_info;



	fb_info = (struct intel_vgpu_fb_info *)obj->gvt_info;

	if (WARN_ON(!fb_info))

		return -ENODEV;



	st = kmalloc(sizeof(*st), GFP_KERNEL);

	if (unlikely(!st))

		return -ENOMEM;



	ret = sg_alloc_table(st, fb_info->size, GFP_KERNEL);

	if (ret) {

		kfree(st);

		return ret;

	}

	gtt_entries = (gen8_pte_t __iomem *)dev_priv->ggtt.gsm +

		(fb_info->start >> PAGE_SHIFT);

	for_each_sg(st->sgl, sg, fb_info->size, i) {

		sg->offset = 0;

		sg->length = PAGE_SIZE;

		sg_dma_address(sg) =

			GEN8_DECODE_PTE(readq(&gtt_entries[i]));

		sg_dma_len(sg) = PAGE_SIZE;

	}



	__i915_gem_object_set_pages(obj, st, PAGE_SIZE);



	return 0;

}



static void vgpu_gem_put_pages(struct drm_i915_gem_object *obj,

		struct sg_table *pages)

{

	sg_free_table(pages);

	kfree(pages);

}



static void dmabuf_gem_object_free(struct kref *kref)

{

	struct intel_vgpu_dmabuf_obj *obj =

		container_of(kref, struct intel_vgpu_dmabuf_obj, kref);

	struct intel_vgpu *vgpu = obj->vgpu;

	struct list_head *pos;



	struct intel_vgpu_dmabuf_obj *dmabuf_obj;



	list_for_each(pos, &vgpu->dmabuf_obj_list_head) {

		dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj,

						list);

		if (dmabuf_obj == obj) {

			idr_remove(&vgpu->object_idr, dmabuf_obj->dmabuf_id);

			kfree(dmabuf_obj->info);

			kfree(dmabuf_obj);

			list_del(pos);

			break;

		}

	}

}





static inline void dmabuf_obj_get(struct intel_vgpu_dmabuf_obj *obj)

{

	kref_get(&obj->kref);

}



static inline void dmabuf_obj_put(struct intel_vgpu_dmabuf_obj *obj)

{

	kref_put(&obj->kref, dmabuf_gem_object_free);

}



static void vgpu_gem_release(struct drm_i915_gem_object *gem_obj)

{



	struct intel_vgpu_fb_info *fb_info = gem_obj->gvt_info;

	struct intel_vgpu_dmabuf_obj *obj = fb_info->obj;

	struct intel_vgpu *vgpu = obj->vgpu;



	mutex_lock(&vgpu->dmabuf_lock);

	gem_obj->base.dma_buf = NULL;

	dmabuf_obj_put(obj);

	intel_gvt_hypervisor_put_vfio_device(vgpu);

	mutex_unlock(&vgpu->dmabuf_lock);

}



static const struct drm_i915_gem_object_ops intel_vgpu_gem_ops = {

	.flags = I915_GEM_OBJECT_IS_PROXY,

	.get_pages = vgpu_gem_get_pages,

	.put_pages = vgpu_gem_put_pages,

	.release = vgpu_gem_release,

};



static struct drm_i915_gem_object *vgpu_create_gem(struct drm_device *dev,

		struct intel_vgpu_fb_info *info)

{

	struct drm_i915_private *dev_priv = to_i915(dev);

	struct drm_i915_gem_object *obj;



	obj = i915_gem_object_alloc(dev_priv);

	if (obj == NULL)

		return NULL;



	drm_gem_private_object_init(dev, &obj->base,

		info->size << PAGE_SHIFT);

	i915_gem_object_init(obj, &intel_vgpu_gem_ops);



	obj->base.read_domains = I915_GEM_DOMAIN_GTT;

	obj->base.write_domain = 0;

	if (IS_SKYLAKE(dev_priv)) {

		unsigned int tiling_mode = 0;

		unsigned int stride = 0;



		switch (info->drm_format_mod << 10) {

		case PLANE_CTL_TILED_LINEAR:

			tiling_mode = I915_TILING_NONE;

			break;

		case PLANE_CTL_TILED_X:

			tiling_mode = I915_TILING_X;

			stride = info->stride;

			break;

		case PLANE_CTL_TILED_Y:

			tiling_mode = I915_TILING_Y;

			stride = info->stride;

			break;

		default:

			gvt_dbg_core("not supported tiling mode\n");

		}

		obj->tiling_and_stride = tiling_mode | stride;

	} else {

		obj->tiling_and_stride = info->drm_format_mod ?

					I915_TILING_X : 0;

	}



	return obj;

}



static int vgpu_get_plane_info(struct drm_device *dev,

		struct intel_vgpu *vgpu,

		struct intel_vgpu_fb_info *info,

		int plane_id)

{

	struct drm_i915_private *dev_priv = to_i915(dev);

	struct intel_vgpu_primary_plane_format p;

	struct intel_vgpu_cursor_plane_format c;

	int ret;



	if (plane_id == DRM_PLANE_TYPE_PRIMARY) {

		ret = intel_vgpu_decode_primary_plane(vgpu, &p);

		if (ret)

			return ret;

		info->start = p.base;

		info->start_gpa = p.base_gpa;

		info->width = p.width;

		info->height = p.height;

		info->stride = p.stride;

		info->drm_format = p.drm_format;

		info->drm_format_mod = p.tiled;

		info->size = (((p.stride * p.height * p.bpp) / 8) +

				(PAGE_SIZE - 1)) >> PAGE_SHIFT;

	} else if (plane_id == DRM_PLANE_TYPE_CURSOR) {

		ret = intel_vgpu_decode_cursor_plane(vgpu, &c);

		if (ret)

			return ret;

		info->start = c.base;

		info->start_gpa = c.base_gpa;

		info->width = c.width;

		info->height = c.height;

		info->stride = c.width * (c.bpp / 8);

		info->drm_format = c.drm_format;

		info->drm_format_mod = 0;

		info->x_pos = c.x_pos;

		info->y_pos = c.y_pos;



		/* The invalid cursor hotspot value is delivered to host

		 * until we find a way to get the cursor hotspot info of

		 * guest OS.

		 */

		info->x_hot = UINT_MAX;

		info->y_hot = UINT_MAX;

		info->size = (((info->stride * c.height * c.bpp) / 8)

				+ (PAGE_SIZE - 1)) >> PAGE_SHIFT;

	} else {

		gvt_vgpu_err("invalid plane id:%d\n", plane_id);

		return -EINVAL;

	}



	if (info->size == 0) {

		gvt_vgpu_err("fb size is zero\n");

		return -EINVAL;

	}



	if (info->start & (PAGE_SIZE - 1)) {

		gvt_vgpu_err("Not aligned fb address:0x%llx\n", info->start);

		return -EFAULT;

	}

	if (((info->start >> PAGE_SHIFT) + info->size) >

		ggtt_total_entries(&dev_priv->ggtt)) {

		gvt_vgpu_err("Invalid GTT offset or size\n");

		return -EFAULT;

	}



	if (!intel_gvt_ggtt_validate_range(vgpu, info->start, info->size)) {

		gvt_vgpu_err("invalid gma addr\n");

		return -EFAULT;

	}



	return 0;

}



static struct intel_vgpu_dmabuf_obj *

pick_dmabuf_by_info(struct intel_vgpu *vgpu,

		    struct intel_vgpu_fb_info *latest_info)

{

	struct list_head *pos;

	struct intel_vgpu_fb_info *fb_info;

	struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL;

	struct intel_vgpu_dmabuf_obj *ret = NULL;



	list_for_each(pos, &vgpu->dmabuf_obj_list_head) {

		dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj,

						list);

		if ((dmabuf_obj == NULL) ||

		    (dmabuf_obj->info == NULL))

			continue;



		fb_info = (struct intel_vgpu_fb_info *)dmabuf_obj->info;

		if ((fb_info->start == latest_info->start) &&

		    (fb_info->start_gpa == latest_info->start_gpa) &&

		    (fb_info->size == latest_info->size) &&

		    (fb_info->drm_format_mod == latest_info->drm_format_mod) &&

		    (fb_info->drm_format == latest_info->drm_format) &&

		    (fb_info->width == latest_info->width) &&

		    (fb_info->height == latest_info->height)) {

			ret = dmabuf_obj;

			break;

		}

	}



	return ret;

}



static struct intel_vgpu_dmabuf_obj *

pick_dmabuf_by_num(struct intel_vgpu *vgpu, u32 id)

{

	struct list_head *pos;

	struct intel_vgpu_dmabuf_obj *dmabuf_obj = NULL;

	struct intel_vgpu_dmabuf_obj *ret = NULL;



	list_for_each(pos, &vgpu->dmabuf_obj_list_head) {

		dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj,

						list);

		if (!dmabuf_obj)

			continue;



		if (dmabuf_obj->dmabuf_id == id) {

			ret = dmabuf_obj;

			break;

		}

	}



	return ret;

}



static void update_fb_info(struct vfio_device_gfx_plane_info *gvt_dmabuf,

		      struct intel_vgpu_fb_info *fb_info)

{

	gvt_dmabuf->drm_format = fb_info->drm_format;

	gvt_dmabuf->width = fb_info->width;

	gvt_dmabuf->height = fb_info->height;

	gvt_dmabuf->stride = fb_info->stride;

	gvt_dmabuf->size = fb_info->size;

	gvt_dmabuf->x_pos = fb_info->x_pos;

	gvt_dmabuf->y_pos = fb_info->y_pos;

	gvt_dmabuf->x_hot = fb_info->x_hot;

	gvt_dmabuf->y_hot = fb_info->y_hot;

}



int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args)

{

	struct drm_device *dev = &vgpu->gvt->dev_priv->drm;

	struct vfio_device_gfx_plane_info *gfx_plane_info = args;

	struct intel_vgpu_dmabuf_obj *dmabuf_obj;

	struct intel_vgpu_fb_info fb_info;

	int ret = 0;



	if (gfx_plane_info->flags == (VFIO_GFX_PLANE_TYPE_DMABUF |

				       VFIO_GFX_PLANE_TYPE_PROBE))

		return ret;

	else if ((gfx_plane_info->flags & ~VFIO_GFX_PLANE_TYPE_DMABUF) ||

			(!gfx_plane_info->flags))

		return -EINVAL;



	ret = vgpu_get_plane_info(dev, vgpu, &fb_info,

					gfx_plane_info->drm_plane_type);

	if (ret != 0)

		goto out;



	mutex_lock(&vgpu->dmabuf_lock);

	/* If exists, pick up the exposed dmabuf_obj */

	dmabuf_obj = pick_dmabuf_by_info(vgpu, &fb_info);

	if (dmabuf_obj) {

		update_fb_info(gfx_plane_info, &fb_info);

		gfx_plane_info->dmabuf_id = dmabuf_obj->dmabuf_id;



		/* This buffer may be released between query_plane ioctl and

		 * get_dmabuf ioctl. Add the refcount to make sure it won't

		 * be released between the two ioctls.

		 */

		if (!dmabuf_obj->initref) {

			dmabuf_obj->initref = true;

			dmabuf_obj_get(dmabuf_obj);

		}

		ret = 0;

		gvt_dbg_dpy("vgpu%d: re-use dmabuf_obj ref %d, id %d\n",

			    vgpu->id, kref_read(&dmabuf_obj->kref),

			    gfx_plane_info->dmabuf_id);

		mutex_unlock(&vgpu->dmabuf_lock);

		goto out;

	}



	mutex_unlock(&vgpu->dmabuf_lock);



	/* Need to allocate a new one*/

	dmabuf_obj = kmalloc(sizeof(struct intel_vgpu_dmabuf_obj), GFP_KERNEL);

	if (unlikely(!dmabuf_obj)) {

		gvt_vgpu_err("alloc dmabuf_obj failed\n");

		ret = -ENOMEM;

		goto out;

	}



	dmabuf_obj->info = kmalloc(sizeof(struct intel_vgpu_fb_info),

				   GFP_KERNEL);

	if (unlikely(!dmabuf_obj->info)) {

		gvt_vgpu_err("allocate intel vgpu fb info failed\n");

		ret = -ENOMEM;

		goto out_free_dmabuf;

	}

	memcpy(dmabuf_obj->info, &fb_info, sizeof(struct intel_vgpu_fb_info));



	((struct intel_vgpu_fb_info *)dmabuf_obj->info)->obj = dmabuf_obj;



	dmabuf_obj->vgpu = vgpu;



	ret = idr_alloc(&vgpu->object_idr, dmabuf_obj, 1, 0, GFP_NOWAIT);

	if (ret < 0)

		goto out_free_info;

	gfx_plane_info->dmabuf_id = ret;

	dmabuf_obj->dmabuf_id = ret;



	dmabuf_obj->initref = true;



	kref_init(&dmabuf_obj->kref);



	mutex_lock(&vgpu->dmabuf_lock);

	if (intel_gvt_hypervisor_get_vfio_device(vgpu)) {

		gvt_vgpu_err("get vfio device failed\n");

		mutex_unlock(&vgpu->dmabuf_lock);

		goto out_free_info;

	}

	mutex_unlock(&vgpu->dmabuf_lock);



	update_fb_info(gfx_plane_info, &fb_info);



	INIT_LIST_HEAD(&dmabuf_obj->list);

	mutex_lock(&vgpu->dmabuf_lock);

	list_add_tail(&dmabuf_obj->list, &vgpu->dmabuf_obj_list_head);

	mutex_unlock(&vgpu->dmabuf_lock);



	gvt_dbg_dpy("vgpu%d: %s new dmabuf_obj ref %d, id %d\n", vgpu->id,

		    __func__, kref_read(&dmabuf_obj->kref), ret);



	return 0;



out_free_info:

	kfree(dmabuf_obj->info);

out_free_dmabuf:

	kfree(dmabuf_obj);

out:

	/* ENODEV means plane isn't ready, which might be a normal case. */

	return (ret == -ENODEV) ? 0 : ret;

}



/* To associate an exposed dmabuf with the dmabuf_obj */

int intel_vgpu_get_dmabuf(struct intel_vgpu *vgpu, unsigned int dmabuf_id)

{

	struct drm_device *dev = &vgpu->gvt->dev_priv->drm;

	struct intel_vgpu_dmabuf_obj *dmabuf_obj;

	struct drm_i915_gem_object *obj;

	struct dma_buf *dmabuf;

	int dmabuf_fd;

	int ret = 0;



	mutex_lock(&vgpu->dmabuf_lock);



	dmabuf_obj = pick_dmabuf_by_num(vgpu, dmabuf_id);

	if (dmabuf_obj == NULL) {

		gvt_vgpu_err("invalid dmabuf id:%d\n", dmabuf_id);

		ret = -EINVAL;

		goto out;

	}



	obj = vgpu_create_gem(dev, dmabuf_obj->info);

	if (obj == NULL) {

		gvt_vgpu_err("create gvt gem obj failed:%d\n", vgpu->id);

		ret = -ENOMEM;

		goto out;

	}



	obj->gvt_info = dmabuf_obj->info;



	dmabuf = i915_gem_prime_export(dev, &obj->base, DRM_CLOEXEC | DRM_RDWR);

	if (IS_ERR(dmabuf)) {

		gvt_vgpu_err("export dma-buf failed\n");

		ret = PTR_ERR(dmabuf);

		goto out_free_gem;

	}

	obj->base.dma_buf = dmabuf;



	i915_gem_object_put(obj);



	ret = dma_buf_fd(dmabuf, DRM_CLOEXEC | DRM_RDWR);

	if (ret < 0) {

		gvt_vgpu_err("create dma-buf fd failed ret:%d\n", ret);

		goto out_free_dmabuf;

	}

	dmabuf_fd = ret;



	if (intel_gvt_hypervisor_get_vfio_device(vgpu)) {

		gvt_vgpu_err("get vfio device failed\n");

		put_unused_fd(ret);

		goto out_free_dmabuf;

	}



	dmabuf_obj_get(dmabuf_obj);



	if (dmabuf_obj->initref) {

		dmabuf_obj->initref = false;

		dmabuf_obj_put(dmabuf_obj);

	}



	mutex_unlock(&vgpu->dmabuf_lock);



	gvt_dbg_dpy("vgpu%d: dmabuf:%d, dmabuf ref %d, fd:%d\n"

		    "        file count: %ld, GEM ref: %d\n",

		    vgpu->id, dmabuf_obj->dmabuf_id,

		    kref_read(&dmabuf_obj->kref),

		    dmabuf_fd,

		    file_count(dmabuf->file),

		    kref_read(&obj->base.refcount));



	return dmabuf_fd;



out_free_dmabuf:

	dma_buf_put(dmabuf);

out_free_gem:

	i915_gem_object_put(obj);

out:

	mutex_unlock(&vgpu->dmabuf_lock);

	return ret;

}



void intel_vgpu_dmabuf_cleanup(struct intel_vgpu *vgpu)

{

	struct list_head *pos, *n;

	struct intel_vgpu_dmabuf_obj *dmabuf_obj;



	mutex_lock(&vgpu->dmabuf_lock);

	list_for_each_safe(pos, n, &vgpu->dmabuf_obj_list_head) {

		dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj,

						list);

		if (dmabuf_obj->initref) {

			dmabuf_obj->initref = false;

			dmabuf_obj_put(dmabuf_obj);

		}

	}

	mutex_unlock(&vgpu->dmabuf_lock);

}

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

0 → 100644
+67 −0
Original line number Diff line number Diff line 
/*

 * Copyright(c) 2017 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:

 *    Zhiyuan Lv <zhiyuan.lv@intel.com>

 *

 * Contributors:

 *    Xiaoguang Chen

 *    Tina Zhang <tina.zhang@intel.com>

 */



#ifndef _GVT_DMABUF_H_

#define _GVT_DMABUF_H_

#include <linux/vfio.h>



struct intel_vgpu_fb_info {

	__u64 start;

	__u64 start_gpa;

	__u64 drm_format_mod;

	__u32 drm_format;	/* drm format of plane */

	__u32 width;	/* width of plane */

	__u32 height;	/* height of plane */

	__u32 stride;	/* stride of plane */

	__u32 size;	/* size of plane in bytes, align on page */

	__u32 x_pos;	/* horizontal position of cursor plane */

	__u32 y_pos;	/* vertical position of cursor plane */

	__u32 x_hot;    /* horizontal position of cursor hotspot */

	__u32 y_hot;    /* vertical position of cursor hotspot */

	struct intel_vgpu_dmabuf_obj *obj;

};



/**

 * struct intel_vgpu_dmabuf_obj- Intel vGPU device buffer object

 */

struct intel_vgpu_dmabuf_obj {

	struct intel_vgpu *vgpu;

	struct intel_vgpu_fb_info *info;

	__u32 dmabuf_id;

	struct kref kref;

	bool initref;

	struct list_head list;

};



int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args);

int intel_vgpu_get_dmabuf(struct intel_vgpu *vgpu, unsigned int dmabuf_id);

void intel_vgpu_dmabuf_cleanup(struct intel_vgpu *vgpu);



#endif

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

+2 −0
Original line number Diff line number Diff line
@@ -181,6 +181,8 @@ static const struct intel_gvt_ops intel_gvt_ops = { 
	.vgpu_deactivate = intel_gvt_deactivate_vgpu,

	.gvt_find_vgpu_type = intel_gvt_find_vgpu_type,

	.get_gvt_attrs = intel_get_gvt_attrs,

	.vgpu_query_plane = intel_vgpu_query_plane,

	.vgpu_get_dmabuf = intel_vgpu_get_dmabuf,

};



/**

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

+11 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ 
#include "render.h"

#include "cmd_parser.h"

#include "fb_decoder.h"

#include "dmabuf.h"



#define GVT_MAX_VGPU 8
@@ -209,8 +210,16 @@ struct intel_vgpu { 
		struct kvm *kvm;

		struct work_struct release_work;

		atomic_t released;

		struct vfio_device *vfio_device;

	} vdev;

#endif



	struct list_head dmabuf_obj_list_head;

	struct mutex dmabuf_lock;

	struct idr object_idr;



	struct completion vblank_done;



};



/* validating GM healthy status*/
@@ -536,6 +545,8 @@ struct intel_gvt_ops { 
			const char *name);

	bool (*get_gvt_attrs)(struct attribute ***type_attrs,

			struct attribute_group ***intel_vgpu_type_groups);

	int (*vgpu_query_plane)(struct intel_vgpu *vgpu, void *);

	int (*vgpu_get_dmabuf)(struct intel_vgpu *vgpu, unsigned int);

};