| /* |
| * Copyright 2011 Red Hat, Inc. |
| * Copyright © 2014 The Chromium OS Authors |
| * |
| * 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 |
| * on the rights to use, copy, modify, merge, publish, distribute, sub |
| * license, and/or sell copies of the Software, and to permit persons to whom |
| * them 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 MERCHANTIBILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS 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: |
| * Adam Jackson <ajax@redhat.com> |
| * Ben Widawsky <ben@bwidawsk.net> |
| */ |
| |
| /** |
| * This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's |
| * software renderer and the X server for efficient buffer sharing. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/ramfs.h> |
| #include <linux/shmem_fs.h> |
| #include <linux/dma-buf.h> |
| #include "vgem_drv.h" |
| |
| #define DRIVER_NAME "vgem" |
| #define DRIVER_DESC "Virtual GEM provider" |
| #define DRIVER_DATE "20120112" |
| #define DRIVER_MAJOR 1 |
| #define DRIVER_MINOR 0 |
| |
| static void vgem_gem_free_object(struct drm_gem_object *obj) |
| { |
| struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj); |
| |
| drm_gem_object_release(obj); |
| kfree(vgem_obj); |
| } |
| |
| static int vgem_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| { |
| struct drm_vgem_gem_object *obj = vma->vm_private_data; |
| /* We don't use vmf->pgoff since that has the fake offset */ |
| unsigned long vaddr = (unsigned long)vmf->virtual_address; |
| struct page *page; |
| |
| page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping, |
| (vaddr - vma->vm_start) >> PAGE_SHIFT); |
| if (!IS_ERR(page)) { |
| vmf->page = page; |
| return 0; |
| } else switch (PTR_ERR(page)) { |
| case -ENOSPC: |
| case -ENOMEM: |
| return VM_FAULT_OOM; |
| case -EBUSY: |
| return VM_FAULT_RETRY; |
| case -EFAULT: |
| case -EINVAL: |
| return VM_FAULT_SIGBUS; |
| default: |
| WARN_ON_ONCE(PTR_ERR(page)); |
| return VM_FAULT_SIGBUS; |
| } |
| } |
| |
| static const struct vm_operations_struct vgem_gem_vm_ops = { |
| .fault = vgem_gem_fault, |
| .open = drm_gem_vm_open, |
| .close = drm_gem_vm_close, |
| }; |
| |
| /* ioctls */ |
| |
| static struct drm_gem_object *vgem_gem_create(struct drm_device *dev, |
| struct drm_file *file, |
| unsigned int *handle, |
| unsigned long size) |
| { |
| struct drm_vgem_gem_object *obj; |
| int ret; |
| |
| obj = kzalloc(sizeof(*obj), GFP_KERNEL); |
| if (!obj) |
| return ERR_PTR(-ENOMEM); |
| |
| ret = drm_gem_object_init(dev, &obj->base, roundup(size, PAGE_SIZE)); |
| if (ret) |
| goto err_free; |
| |
| ret = drm_gem_handle_create(file, &obj->base, handle); |
| drm_gem_object_unreference_unlocked(&obj->base); |
| if (ret) |
| goto err; |
| |
| return &obj->base; |
| |
| err_free: |
| kfree(obj); |
| err: |
| return ERR_PTR(ret); |
| } |
| |
| static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev, |
| struct drm_mode_create_dumb *args) |
| { |
| struct drm_gem_object *gem_object; |
| u64 pitch, size; |
| |
| pitch = args->width * DIV_ROUND_UP(args->bpp, 8); |
| size = args->height * pitch; |
| if (size == 0) |
| return -EINVAL; |
| |
| gem_object = vgem_gem_create(dev, file, &args->handle, size); |
| if (IS_ERR(gem_object)) |
| return PTR_ERR(gem_object); |
| |
| args->size = gem_object->size; |
| args->pitch = pitch; |
| |
| DRM_DEBUG_DRIVER("Created object of size %lld\n", size); |
| |
| return 0; |
| } |
| |
| static int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev, |
| uint32_t handle, uint64_t *offset) |
| { |
| struct drm_gem_object *obj; |
| int ret; |
| |
| obj = drm_gem_object_lookup(file, handle); |
| if (!obj) |
| return -ENOENT; |
| |
| if (!obj->filp) { |
| ret = -EINVAL; |
| goto unref; |
| } |
| |
| ret = drm_gem_create_mmap_offset(obj); |
| if (ret) |
| goto unref; |
| |
| *offset = drm_vma_node_offset_addr(&obj->vma_node); |
| unref: |
| drm_gem_object_unreference_unlocked(obj); |
| |
| return ret; |
| } |
| |
| static struct drm_ioctl_desc vgem_ioctls[] = { |
| }; |
| |
| static int vgem_mmap(struct file *filp, struct vm_area_struct *vma) |
| { |
| unsigned long flags = vma->vm_flags; |
| int ret; |
| |
| ret = drm_gem_mmap(filp, vma); |
| if (ret) |
| return ret; |
| |
| /* Keep the WC mmaping set by drm_gem_mmap() but our pages |
| * are ordinary and not special. |
| */ |
| vma->vm_flags = flags | VM_DONTEXPAND | VM_DONTDUMP; |
| return 0; |
| } |
| |
| static const struct file_operations vgem_driver_fops = { |
| .owner = THIS_MODULE, |
| .open = drm_open, |
| .mmap = vgem_mmap, |
| .poll = drm_poll, |
| .read = drm_read, |
| .unlocked_ioctl = drm_ioctl, |
| .release = drm_release, |
| }; |
| |
| static int vgem_prime_pin(struct drm_gem_object *obj) |
| { |
| long n_pages = obj->size >> PAGE_SHIFT; |
| struct page **pages; |
| |
| /* Flush the object from the CPU cache so that importers can rely |
| * on coherent indirect access via the exported dma-address. |
| */ |
| pages = drm_gem_get_pages(obj); |
| if (IS_ERR(pages)) |
| return PTR_ERR(pages); |
| |
| drm_clflush_pages(pages, n_pages); |
| drm_gem_put_pages(obj, pages, true, false); |
| |
| return 0; |
| } |
| |
| static struct sg_table *vgem_prime_get_sg_table(struct drm_gem_object *obj) |
| { |
| struct sg_table *st; |
| struct page **pages; |
| |
| pages = drm_gem_get_pages(obj); |
| if (IS_ERR(pages)) |
| return ERR_CAST(pages); |
| |
| st = drm_prime_pages_to_sg(pages, obj->size >> PAGE_SHIFT); |
| drm_gem_put_pages(obj, pages, false, false); |
| |
| return st; |
| } |
| |
| static void *vgem_prime_vmap(struct drm_gem_object *obj) |
| { |
| long n_pages = obj->size >> PAGE_SHIFT; |
| struct page **pages; |
| void *addr; |
| |
| pages = drm_gem_get_pages(obj); |
| if (IS_ERR(pages)) |
| return NULL; |
| |
| addr = vmap(pages, n_pages, 0, pgprot_writecombine(PAGE_KERNEL)); |
| drm_gem_put_pages(obj, pages, false, false); |
| |
| return addr; |
| } |
| |
| static void vgem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) |
| { |
| vunmap(vaddr); |
| } |
| |
| static int vgem_prime_mmap(struct drm_gem_object *obj, |
| struct vm_area_struct *vma) |
| { |
| int ret; |
| |
| if (obj->size < vma->vm_end - vma->vm_start) |
| return -EINVAL; |
| |
| if (!obj->filp) |
| return -ENODEV; |
| |
| ret = obj->filp->f_op->mmap(obj->filp, vma); |
| if (ret) |
| return ret; |
| |
| fput(vma->vm_file); |
| vma->vm_file = get_file(obj->filp); |
| vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
| vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); |
| |
| return 0; |
| } |
| |
| static struct drm_driver vgem_driver = { |
| .driver_features = DRIVER_GEM | DRIVER_PRIME, |
| .gem_free_object_unlocked = vgem_gem_free_object, |
| .gem_vm_ops = &vgem_gem_vm_ops, |
| .ioctls = vgem_ioctls, |
| .fops = &vgem_driver_fops, |
| |
| .dumb_create = vgem_gem_dumb_create, |
| .dumb_map_offset = vgem_gem_dumb_map, |
| |
| .prime_handle_to_fd = drm_gem_prime_handle_to_fd, |
| .gem_prime_pin = vgem_prime_pin, |
| .gem_prime_export = drm_gem_prime_export, |
| .gem_prime_get_sg_table = vgem_prime_get_sg_table, |
| .gem_prime_vmap = vgem_prime_vmap, |
| .gem_prime_vunmap = vgem_prime_vunmap, |
| .gem_prime_mmap = vgem_prime_mmap, |
| |
| .name = DRIVER_NAME, |
| .desc = DRIVER_DESC, |
| .date = DRIVER_DATE, |
| .major = DRIVER_MAJOR, |
| .minor = DRIVER_MINOR, |
| }; |
| |
| static struct drm_device *vgem_device; |
| |
| static int __init vgem_init(void) |
| { |
| int ret; |
| |
| vgem_device = drm_dev_alloc(&vgem_driver, NULL); |
| if (!vgem_device) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| ret = drm_dev_register(vgem_device, 0); |
| if (ret) |
| goto out_unref; |
| |
| return 0; |
| |
| out_unref: |
| drm_dev_unref(vgem_device); |
| out: |
| return ret; |
| } |
| |
| static void __exit vgem_exit(void) |
| { |
| drm_dev_unregister(vgem_device); |
| drm_dev_unref(vgem_device); |
| } |
| |
| module_init(vgem_init); |
| module_exit(vgem_exit); |
| |
| MODULE_AUTHOR("Red Hat, Inc."); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL and additional rights"); |