2015-03-05 07:33:41 +07:00
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/*
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* Copyright 2011 Red Hat, Inc.
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* Copyright © 2014 The Chromium OS Authors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software")
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* to deal in the software without restriction, including without limitation
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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* them Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Adam Jackson <ajax@redhat.com>
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* Ben Widawsky <ben@bwidawsk.net>
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*/
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/**
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* This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's
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* software renderer and the X server for efficient buffer sharing.
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*/
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#include <linux/module.h>
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#include <linux/ramfs.h>
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#include <linux/shmem_fs.h>
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#include <linux/dma-buf.h>
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#include "vgem_drv.h"
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#define DRIVER_NAME "vgem"
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#define DRIVER_DESC "Virtual GEM provider"
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#define DRIVER_DATE "20120112"
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#define DRIVER_MAJOR 1
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#define DRIVER_MINOR 0
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void vgem_gem_put_pages(struct drm_vgem_gem_object *obj)
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{
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drm_gem_put_pages(&obj->base, obj->pages, false, false);
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obj->pages = NULL;
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}
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static void vgem_gem_free_object(struct drm_gem_object *obj)
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{
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struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
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drm_gem_free_mmap_offset(obj);
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if (vgem_obj->use_dma_buf && obj->dma_buf) {
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dma_buf_put(obj->dma_buf);
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obj->dma_buf = NULL;
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}
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drm_gem_object_release(obj);
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if (vgem_obj->pages)
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vgem_gem_put_pages(vgem_obj);
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vgem_obj->pages = NULL;
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kfree(vgem_obj);
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}
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int vgem_gem_get_pages(struct drm_vgem_gem_object *obj)
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{
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struct page **pages;
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if (obj->pages || obj->use_dma_buf)
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return 0;
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pages = drm_gem_get_pages(&obj->base);
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if (IS_ERR(pages)) {
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return PTR_ERR(pages);
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}
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obj->pages = pages;
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return 0;
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}
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static int vgem_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct drm_vgem_gem_object *obj = vma->vm_private_data;
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struct drm_device *dev = obj->base.dev;
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loff_t num_pages;
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pgoff_t page_offset;
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int ret;
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/* We don't use vmf->pgoff since that has the fake offset */
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page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
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PAGE_SHIFT;
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num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
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if (page_offset > num_pages)
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return VM_FAULT_SIGBUS;
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mutex_lock(&dev->struct_mutex);
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ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address,
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obj->pages[page_offset]);
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mutex_unlock(&dev->struct_mutex);
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switch (ret) {
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case 0:
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return VM_FAULT_NOPAGE;
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case -ENOMEM:
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return VM_FAULT_OOM;
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case -EBUSY:
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return VM_FAULT_RETRY;
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case -EFAULT:
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case -EINVAL:
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return VM_FAULT_SIGBUS;
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default:
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WARN_ON(1);
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return VM_FAULT_SIGBUS;
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}
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}
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static struct vm_operations_struct vgem_gem_vm_ops = {
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.fault = vgem_gem_fault,
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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/* ioctls */
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static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
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struct drm_file *file,
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unsigned int *handle,
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unsigned long size)
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{
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struct drm_vgem_gem_object *obj;
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struct drm_gem_object *gem_object;
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int err;
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size = roundup(size, PAGE_SIZE);
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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (!obj)
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return ERR_PTR(-ENOMEM);
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gem_object = &obj->base;
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err = drm_gem_object_init(dev, gem_object, size);
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if (err)
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goto out;
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err = drm_gem_handle_create(file, gem_object, handle);
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if (err)
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goto handle_out;
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drm_gem_object_unreference_unlocked(gem_object);
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return gem_object;
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handle_out:
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drm_gem_object_release(gem_object);
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out:
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kfree(obj);
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return ERR_PTR(err);
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}
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static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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struct drm_gem_object *gem_object;
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uint64_t size;
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uint64_t pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
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size = args->height * pitch;
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if (size == 0)
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return -EINVAL;
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gem_object = vgem_gem_create(dev, file, &args->handle, size);
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if (IS_ERR(gem_object)) {
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DRM_DEBUG_DRIVER("object creation failed\n");
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return PTR_ERR(gem_object);
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}
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args->size = gem_object->size;
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args->pitch = pitch;
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DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
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return 0;
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}
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int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev,
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uint32_t handle, uint64_t *offset)
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{
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int ret = 0;
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struct drm_gem_object *obj;
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mutex_lock(&dev->struct_mutex);
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obj = drm_gem_object_lookup(dev, file, handle);
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if (!obj) {
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ret = -ENOENT;
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goto unlock;
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}
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if (!drm_vma_node_has_offset(&obj->vma_node)) {
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ret = drm_gem_create_mmap_offset(obj);
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if (ret)
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goto unref;
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}
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BUG_ON(!obj->filp);
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obj->filp->private_data = obj;
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ret = vgem_gem_get_pages(to_vgem_bo(obj));
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if (ret)
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goto fail_get_pages;
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*offset = drm_vma_node_offset_addr(&obj->vma_node);
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goto unref;
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fail_get_pages:
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drm_gem_free_mmap_offset(obj);
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unref:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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int vgem_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_file *priv = filp->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_vma_offset_node *node;
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struct drm_gem_object *obj;
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struct drm_vgem_gem_object *vgem_obj;
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int ret = 0;
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mutex_lock(&dev->struct_mutex);
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node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
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vma->vm_pgoff,
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vma_pages(vma));
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if (!node) {
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ret = -EINVAL;
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goto out_unlock;
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} else if (!drm_vma_node_is_allowed(node, filp)) {
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ret = -EACCES;
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goto out_unlock;
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}
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obj = container_of(node, struct drm_gem_object, vma_node);
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vgem_obj = to_vgem_bo(obj);
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if (obj->dma_buf && vgem_obj->use_dma_buf) {
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ret = dma_buf_mmap(obj->dma_buf, vma, 0);
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goto out_unlock;
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}
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if (!obj->dev->driver->gem_vm_ops) {
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ret = -EINVAL;
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goto out_unlock;
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}
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vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
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vma->vm_ops = obj->dev->driver->gem_vm_ops;
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vma->vm_private_data = vgem_obj;
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vma->vm_page_prot =
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pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
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mutex_unlock(&dev->struct_mutex);
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drm_gem_vm_open(vma);
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return ret;
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out_unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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static struct drm_ioctl_desc vgem_ioctls[] = {
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};
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static const struct file_operations vgem_driver_fops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.mmap = vgem_drm_gem_mmap,
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.poll = drm_poll,
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.read = drm_read,
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.unlocked_ioctl = drm_ioctl,
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.release = drm_release,
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};
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static struct drm_driver vgem_driver = {
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2015-05-21 22:58:30 +07:00
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.driver_features = DRIVER_GEM,
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2015-03-05 07:33:41 +07:00
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.gem_free_object = vgem_gem_free_object,
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.gem_vm_ops = &vgem_gem_vm_ops,
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.ioctls = vgem_ioctls,
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.fops = &vgem_driver_fops,
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.dumb_create = vgem_gem_dumb_create,
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.dumb_map_offset = vgem_gem_dumb_map,
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.name = DRIVER_NAME,
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.desc = DRIVER_DESC,
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.date = DRIVER_DATE,
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.major = DRIVER_MAJOR,
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.minor = DRIVER_MINOR,
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};
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struct drm_device *vgem_device;
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static int __init vgem_init(void)
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{
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int ret;
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vgem_device = drm_dev_alloc(&vgem_driver, NULL);
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if (!vgem_device) {
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ret = -ENOMEM;
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goto out;
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}
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ret = drm_dev_register(vgem_device, 0);
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if (ret)
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goto out_unref;
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return 0;
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out_unref:
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drm_dev_unref(vgem_device);
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out:
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return ret;
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}
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static void __exit vgem_exit(void)
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{
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drm_dev_unregister(vgem_device);
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drm_dev_unref(vgem_device);
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}
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module_init(vgem_init);
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module_exit(vgem_exit);
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MODULE_AUTHOR("Red Hat, Inc.");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL and additional rights");
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