![Rob Clark](/assets/img/avatar_default.png)
For actual sharing of buffers with other drivers (ie. actual hardware) we'll need to pimp things out a bit better to deal w/ caching, multiple memory domains, etc. See thread: http://lists.freedesktop.org/archives/dri-devel/2015-May/083160.html But for the llvmpipe use-case this isn't a problem. Nor do we really need prime/dri3 (dri2 is sufficient). So until the other issues are sorted lets remove DRIVER_PRIME. v2: also drop the dead code [airlied: Okay I'm convinced this API could have a lot of use cases that are really really bad, yes the upload use case is valid however that isn't the only use case enabled, and if we allow all the other use cases, people will start to (ab)use them, and then they'll be ABI and my life will get worse, so disable PRIME for now] Acked-by: Thomas Hellstrom <thellstrom@vmware.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
356 lines
7.9 KiB
C
356 lines
7.9 KiB
C
/*
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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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.driver_features = DRIVER_GEM,
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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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