367 lines
8.5 KiB
C
367 lines
8.5 KiB
C
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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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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_object_release(obj);
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kfree(vgem_obj);
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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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/* We don't use vmf->pgoff since that has the fake offset */
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unsigned long vaddr = (unsigned long)vmf->virtual_address;
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struct page *page;
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page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping,
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(vaddr - vma->vm_start) >> PAGE_SHIFT);
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if (!IS_ERR(page)) {
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vmf->page = page;
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return 0;
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} else switch (PTR_ERR(page)) {
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case -ENOSPC:
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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_ONCE(PTR_ERR(page));
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return VM_FAULT_SIGBUS;
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}
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}
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static const 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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static int vgem_open(struct drm_device *dev, struct drm_file *file)
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{
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struct vgem_file *vfile;
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int ret;
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vfile = kzalloc(sizeof(*vfile), GFP_KERNEL);
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if (!vfile)
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return -ENOMEM;
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file->driver_priv = vfile;
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ret = vgem_fence_open(vfile);
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if (ret) {
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kfree(vfile);
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return ret;
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}
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return 0;
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}
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static void vgem_preclose(struct drm_device *dev, struct drm_file *file)
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{
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struct vgem_file *vfile = file->driver_priv;
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vgem_fence_close(vfile);
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kfree(vfile);
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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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int ret;
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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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ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE));
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if (ret)
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goto err_free;
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ret = drm_gem_handle_create(file, &obj->base, handle);
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drm_gem_object_unreference_unlocked(&obj->base);
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if (ret)
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goto err;
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return &obj->base;
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err_free:
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kfree(obj);
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err:
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return ERR_PTR(ret);
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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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u64 pitch, size;
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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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return PTR_ERR(gem_object);
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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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static 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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struct drm_gem_object *obj;
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int ret;
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obj = drm_gem_object_lookup(file, handle);
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if (!obj)
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return -ENOENT;
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if (!obj->filp) {
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ret = -EINVAL;
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goto unref;
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}
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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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*offset = drm_vma_node_offset_addr(&obj->vma_node);
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unref:
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drm_gem_object_unreference_unlocked(obj);
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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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DRM_IOCTL_DEF_DRV(VGEM_FENCE_ATTACH, vgem_fence_attach_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
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DRM_IOCTL_DEF_DRV(VGEM_FENCE_SIGNAL, vgem_fence_signal_ioctl, DRM_AUTH|DRM_RENDER_ALLOW),
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};
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static int vgem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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unsigned long flags = vma->vm_flags;
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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/* Keep the WC mmaping set by drm_gem_mmap() but our pages
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* are ordinary and not special.
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*/
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vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP;
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return 0;
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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_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 int vgem_prime_pin(struct drm_gem_object *obj)
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{
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long n_pages = obj->size >> PAGE_SHIFT;
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struct page **pages;
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/* Flush the object from the CPU cache so that importers can rely
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* on coherent indirect access via the exported dma-address.
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*/
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pages = drm_gem_get_pages(obj);
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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drm_clflush_pages(pages, n_pages);
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drm_gem_put_pages(obj, pages, true, false);
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return 0;
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}
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static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj)
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{
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struct sg_table *st;
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struct page **pages;
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pages = drm_gem_get_pages(obj);
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if (IS_ERR(pages))
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return ERR_CAST(pages);
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st = drm_prime_pages_to_sg(pages, obj->size >> PAGE_SHIFT);
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drm_gem_put_pages(obj, pages, false, false);
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return st;
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}
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static void *vgem_prime_vmap(struct drm_gem_object *obj)
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{
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long n_pages = obj->size >> PAGE_SHIFT;
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struct page **pages;
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void *addr;
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pages = drm_gem_get_pages(obj);
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if (IS_ERR(pages))
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return NULL;
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addr = vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL));
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drm_gem_put_pages(obj, pages, false, false);
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return addr;
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}
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static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
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{
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vunmap(vaddr);
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}
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static int vgem_prime_mmap(struct drm_gem_object *obj,
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struct vm_area_struct *vma)
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{
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int ret;
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if (obj->size < vma->vm_end - vma->vm_start)
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return -EINVAL;
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if (!obj->filp)
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return -ENODEV;
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ret = obj->filp->f_op->mmap(obj->filp, vma);
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if (ret)
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return ret;
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fput(vma->vm_file);
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vma->vm_file = get_file(obj->filp);
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vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
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vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
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return 0;
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}
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static struct drm_driver vgem_driver = {
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.driver_features = DRIVER_GEM | DRIVER_PRIME,
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.open = vgem_open,
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.preclose = vgem_preclose,
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.gem_free_object_unlocked = 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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.num_ioctls = ARRAY_SIZE(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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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.gem_prime_pin = vgem_prime_pin,
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.gem_prime_export = drm_gem_prime_export,
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.gem_prime_get_sg_table = vgem_prime_get_sg_table,
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.gem_prime_vmap = vgem_prime_vmap,
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.gem_prime_vunmap = vgem_prime_vunmap,
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.gem_prime_mmap = vgem_prime_mmap,
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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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static 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 (IS_ERR(vgem_device)) {
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ret = PTR_ERR(vgem_device);
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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_AUTHOR("Intel Corporation");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL and additional rights");
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