cregit-Linux how code gets into the kernel

Release 4.7 drivers/gpu/drm/virtio/virtgpu_gem.c

/*
 * Copyright (C) 2015 Red Hat, Inc.
 * 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 <drm/drmP.h>
#include "virtgpu_drv.h"


void virtio_gpu_gem_free_object(struct drm_gem_object *gem_obj) { struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(gem_obj); if (obj) virtio_gpu_object_unref(&obj); }

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struct virtio_gpu_object *virtio_gpu_alloc_object(struct drm_device *dev, size_t size, bool kernel, bool pinned) { struct virtio_gpu_device *vgdev = dev->dev_private; struct virtio_gpu_object *obj; int ret; ret = virtio_gpu_object_create(vgdev, size, kernel, pinned, &obj); if (ret) return ERR_PTR(ret); return obj; }

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int virtio_gpu_gem_create(struct drm_file *file, struct drm_device *dev, uint64_t size, struct drm_gem_object **obj_p, uint32_t *handle_p) { struct virtio_gpu_object *obj; int ret; u32 handle; obj = virtio_gpu_alloc_object(dev, size, false, false); if (IS_ERR(obj)) return PTR_ERR(obj); ret = drm_gem_handle_create(file, &obj->gem_base, &handle); if (ret) { drm_gem_object_release(&obj->gem_base); return ret; } *obj_p = &obj->gem_base; /* drop reference from allocate - handle holds it now */ drm_gem_object_unreference_unlocked(&obj->gem_base); *handle_p = handle; return 0; }

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int virtio_gpu_mode_dumb_create(struct drm_file *file_priv, struct drm_device *dev, struct drm_mode_create_dumb *args) { struct virtio_gpu_device *vgdev = dev->dev_private; struct drm_gem_object *gobj; struct virtio_gpu_object *obj; int ret; uint32_t pitch; uint32_t resid; pitch = args->width * ((args->bpp + 1) / 8); args->size = pitch * args->height; args->size = ALIGN(args->size, PAGE_SIZE); ret = virtio_gpu_gem_create(file_priv, dev, args->size, &gobj, &args->handle); if (ret) goto fail; virtio_gpu_resource_id_get(vgdev, &resid); virtio_gpu_cmd_create_resource(vgdev, resid, 2, args->width, args->height); /* attach the object to the resource */ obj = gem_to_virtio_gpu_obj(gobj); ret = virtio_gpu_object_attach(vgdev, obj, resid, NULL); if (ret) goto fail; obj->dumb = true; args->pitch = pitch; return ret; fail: return ret; }

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int virtio_gpu_mode_dumb_destroy(struct drm_file *file_priv, struct drm_device *dev, uint32_t handle) { return drm_gem_handle_delete(file_priv, handle); }

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int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv, struct drm_device *dev, uint32_t handle, uint64_t *offset_p) { struct drm_gem_object *gobj; struct virtio_gpu_object *obj; BUG_ON(!offset_p); gobj = drm_gem_object_lookup(file_priv, handle); if (gobj == NULL) return -ENOENT; obj = gem_to_virtio_gpu_obj(gobj); *offset_p = virtio_gpu_object_mmap_offset(obj); drm_gem_object_unreference_unlocked(gobj); return 0; }

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int virtio_gpu_gem_object_open(struct drm_gem_object *obj, struct drm_file *file) { struct virtio_gpu_device *vgdev = obj->dev->dev_private; struct virtio_gpu_fpriv *vfpriv = file->driver_priv; struct virtio_gpu_object *qobj = gem_to_virtio_gpu_obj(obj); int r; if (!vgdev->has_virgl_3d) return 0; r = virtio_gpu_object_reserve(qobj, false); if (r) return r; virtio_gpu_cmd_context_attach_resource(vgdev, vfpriv->ctx_id, qobj->hw_res_handle); virtio_gpu_object_unreserve(qobj); return 0; }

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void virtio_gpu_gem_object_close(struct drm_gem_object *obj, struct drm_file *file) { struct virtio_gpu_device *vgdev = obj->dev->dev_private; struct virtio_gpu_fpriv *vfpriv = file->driver_priv; struct virtio_gpu_object *qobj = gem_to_virtio_gpu_obj(obj); int r; if (!vgdev->has_virgl_3d) return; r = virtio_gpu_object_reserve(qobj, false); if (r) return; virtio_gpu_cmd_context_detach_resource(vgdev, vfpriv->ctx_id, qobj->hw_res_handle); virtio_gpu_object_unreserve(qobj); }

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