Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Gerd Hoffmann | 1476 | 74.70% | 12 | 38.71% |
Gurchetan Singh | 219 | 11.08% | 5 | 16.13% |
Vivek Kasireddy | 92 | 4.66% | 3 | 9.68% |
Lukasz Wiecaszek | 78 | 3.95% | 1 | 3.23% |
Dongwon Kim | 34 | 1.72% | 1 | 3.23% |
Dmitry Osipenko | 24 | 1.21% | 1 | 3.23% |
Marek Szyprowski | 14 | 0.71% | 1 | 3.23% |
Kristian H. Kristensen | 12 | 0.61% | 1 | 3.23% |
Lucas Stach | 10 | 0.51% | 1 | 3.23% |
Pavel Skripkin | 10 | 0.51% | 1 | 3.23% |
Gustavo A. R. Silva | 4 | 0.20% | 1 | 3.23% |
Dan Carpenter | 1 | 0.05% | 1 | 3.23% |
Souptick Joarder | 1 | 0.05% | 1 | 3.23% |
Al Viro | 1 | 0.05% | 1 | 3.23% |
Total | 1976 | 31 |
// SPDX-License-Identifier: GPL-2.0 #include <linux/cred.h> #include <linux/device.h> #include <linux/dma-buf.h> #include <linux/dma-resv.h> #include <linux/highmem.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/memfd.h> #include <linux/miscdevice.h> #include <linux/module.h> #include <linux/shmem_fs.h> #include <linux/slab.h> #include <linux/udmabuf.h> #include <linux/vmalloc.h> #include <linux/iosys-map.h> static int list_limit = 1024; module_param(list_limit, int, 0644); MODULE_PARM_DESC(list_limit, "udmabuf_create_list->count limit. Default is 1024."); static int size_limit_mb = 64; module_param(size_limit_mb, int, 0644); MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in megabytes. Default is 64."); struct udmabuf { pgoff_t pagecount; struct page **pages; struct sg_table *sg; struct miscdevice *device; }; static vm_fault_t udmabuf_vm_fault(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; struct udmabuf *ubuf = vma->vm_private_data; pgoff_t pgoff = vmf->pgoff; if (pgoff >= ubuf->pagecount) return VM_FAULT_SIGBUS; vmf->page = ubuf->pages[pgoff]; get_page(vmf->page); return 0; } static const struct vm_operations_struct udmabuf_vm_ops = { .fault = udmabuf_vm_fault, }; static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma) { struct udmabuf *ubuf = buf->priv; dma_resv_assert_held(buf->resv); if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0) return -EINVAL; vma->vm_ops = &udmabuf_vm_ops; vma->vm_private_data = ubuf; return 0; } static int vmap_udmabuf(struct dma_buf *buf, struct iosys_map *map) { struct udmabuf *ubuf = buf->priv; void *vaddr; dma_resv_assert_held(buf->resv); vaddr = vm_map_ram(ubuf->pages, ubuf->pagecount, -1); if (!vaddr) return -EINVAL; iosys_map_set_vaddr(map, vaddr); return 0; } static void vunmap_udmabuf(struct dma_buf *buf, struct iosys_map *map) { struct udmabuf *ubuf = buf->priv; dma_resv_assert_held(buf->resv); vm_unmap_ram(map->vaddr, ubuf->pagecount); } static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf, enum dma_data_direction direction) { struct udmabuf *ubuf = buf->priv; struct sg_table *sg; int ret; sg = kzalloc(sizeof(*sg), GFP_KERNEL); if (!sg) return ERR_PTR(-ENOMEM); ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->pagecount, 0, ubuf->pagecount << PAGE_SHIFT, GFP_KERNEL); if (ret < 0) goto err; ret = dma_map_sgtable(dev, sg, direction, 0); if (ret < 0) goto err; return sg; err: sg_free_table(sg); kfree(sg); return ERR_PTR(ret); } static void put_sg_table(struct device *dev, struct sg_table *sg, enum dma_data_direction direction) { dma_unmap_sgtable(dev, sg, direction, 0); sg_free_table(sg); kfree(sg); } static struct sg_table *map_udmabuf(struct dma_buf_attachment *at, enum dma_data_direction direction) { return get_sg_table(at->dev, at->dmabuf, direction); } static void unmap_udmabuf(struct dma_buf_attachment *at, struct sg_table *sg, enum dma_data_direction direction) { return put_sg_table(at->dev, sg, direction); } static void release_udmabuf(struct dma_buf *buf) { struct udmabuf *ubuf = buf->priv; struct device *dev = ubuf->device->this_device; pgoff_t pg; if (ubuf->sg) put_sg_table(dev, ubuf->sg, DMA_BIDIRECTIONAL); for (pg = 0; pg < ubuf->pagecount; pg++) put_page(ubuf->pages[pg]); kfree(ubuf->pages); kfree(ubuf); } static int begin_cpu_udmabuf(struct dma_buf *buf, enum dma_data_direction direction) { struct udmabuf *ubuf = buf->priv; struct device *dev = ubuf->device->this_device; int ret = 0; if (!ubuf->sg) { ubuf->sg = get_sg_table(dev, buf, direction); if (IS_ERR(ubuf->sg)) { ret = PTR_ERR(ubuf->sg); ubuf->sg = NULL; } } else { dma_sync_sg_for_cpu(dev, ubuf->sg->sgl, ubuf->sg->nents, direction); } return ret; } static int end_cpu_udmabuf(struct dma_buf *buf, enum dma_data_direction direction) { struct udmabuf *ubuf = buf->priv; struct device *dev = ubuf->device->this_device; if (!ubuf->sg) return -EINVAL; dma_sync_sg_for_device(dev, ubuf->sg->sgl, ubuf->sg->nents, direction); return 0; } static const struct dma_buf_ops udmabuf_ops = { .cache_sgt_mapping = true, .map_dma_buf = map_udmabuf, .unmap_dma_buf = unmap_udmabuf, .release = release_udmabuf, .mmap = mmap_udmabuf, .vmap = vmap_udmabuf, .vunmap = vunmap_udmabuf, .begin_cpu_access = begin_cpu_udmabuf, .end_cpu_access = end_cpu_udmabuf, }; #define SEALS_WANTED (F_SEAL_SHRINK) #define SEALS_DENIED (F_SEAL_WRITE) static long udmabuf_create(struct miscdevice *device, struct udmabuf_create_list *head, struct udmabuf_create_item *list) { DEFINE_DMA_BUF_EXPORT_INFO(exp_info); struct file *memfd = NULL; struct address_space *mapping = NULL; struct udmabuf *ubuf; struct dma_buf *buf; pgoff_t pgoff, pgcnt, pgidx, pgbuf = 0, pglimit; struct page *page; int seals, ret = -EINVAL; u32 i, flags; ubuf = kzalloc(sizeof(*ubuf), GFP_KERNEL); if (!ubuf) return -ENOMEM; pglimit = (size_limit_mb * 1024 * 1024) >> PAGE_SHIFT; for (i = 0; i < head->count; i++) { if (!IS_ALIGNED(list[i].offset, PAGE_SIZE)) goto err; if (!IS_ALIGNED(list[i].size, PAGE_SIZE)) goto err; ubuf->pagecount += list[i].size >> PAGE_SHIFT; if (ubuf->pagecount > pglimit) goto err; } if (!ubuf->pagecount) goto err; ubuf->pages = kmalloc_array(ubuf->pagecount, sizeof(*ubuf->pages), GFP_KERNEL); if (!ubuf->pages) { ret = -ENOMEM; goto err; } pgbuf = 0; for (i = 0; i < head->count; i++) { ret = -EBADFD; memfd = fget(list[i].memfd); if (!memfd) goto err; mapping = memfd->f_mapping; if (!shmem_mapping(mapping)) goto err; seals = memfd_fcntl(memfd, F_GET_SEALS, 0); if (seals == -EINVAL) goto err; ret = -EINVAL; if ((seals & SEALS_WANTED) != SEALS_WANTED || (seals & SEALS_DENIED) != 0) goto err; pgoff = list[i].offset >> PAGE_SHIFT; pgcnt = list[i].size >> PAGE_SHIFT; for (pgidx = 0; pgidx < pgcnt; pgidx++) { page = shmem_read_mapping_page(mapping, pgoff + pgidx); if (IS_ERR(page)) { ret = PTR_ERR(page); goto err; } ubuf->pages[pgbuf++] = page; } fput(memfd); memfd = NULL; } exp_info.ops = &udmabuf_ops; exp_info.size = ubuf->pagecount << PAGE_SHIFT; exp_info.priv = ubuf; exp_info.flags = O_RDWR; ubuf->device = device; buf = dma_buf_export(&exp_info); if (IS_ERR(buf)) { ret = PTR_ERR(buf); goto err; } flags = 0; if (head->flags & UDMABUF_FLAGS_CLOEXEC) flags |= O_CLOEXEC; return dma_buf_fd(buf, flags); err: while (pgbuf > 0) put_page(ubuf->pages[--pgbuf]); if (memfd) fput(memfd); kfree(ubuf->pages); kfree(ubuf); return ret; } static long udmabuf_ioctl_create(struct file *filp, unsigned long arg) { struct udmabuf_create create; struct udmabuf_create_list head; struct udmabuf_create_item list; if (copy_from_user(&create, (void __user *)arg, sizeof(create))) return -EFAULT; head.flags = create.flags; head.count = 1; list.memfd = create.memfd; list.offset = create.offset; list.size = create.size; return udmabuf_create(filp->private_data, &head, &list); } static long udmabuf_ioctl_create_list(struct file *filp, unsigned long arg) { struct udmabuf_create_list head; struct udmabuf_create_item *list; int ret = -EINVAL; u32 lsize; if (copy_from_user(&head, (void __user *)arg, sizeof(head))) return -EFAULT; if (head.count > list_limit) return -EINVAL; lsize = sizeof(struct udmabuf_create_item) * head.count; list = memdup_user((void __user *)(arg + sizeof(head)), lsize); if (IS_ERR(list)) return PTR_ERR(list); ret = udmabuf_create(filp->private_data, &head, list); kfree(list); return ret; } static long udmabuf_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { long ret; switch (ioctl) { case UDMABUF_CREATE: ret = udmabuf_ioctl_create(filp, arg); break; case UDMABUF_CREATE_LIST: ret = udmabuf_ioctl_create_list(filp, arg); break; default: ret = -ENOTTY; break; } return ret; } static const struct file_operations udmabuf_fops = { .owner = THIS_MODULE, .unlocked_ioctl = udmabuf_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = udmabuf_ioctl, #endif }; static struct miscdevice udmabuf_misc = { .minor = MISC_DYNAMIC_MINOR, .name = "udmabuf", .fops = &udmabuf_fops, }; static int __init udmabuf_dev_init(void) { int ret; ret = misc_register(&udmabuf_misc); if (ret < 0) { pr_err("Could not initialize udmabuf device\n"); return ret; } ret = dma_coerce_mask_and_coherent(udmabuf_misc.this_device, DMA_BIT_MASK(64)); if (ret < 0) { pr_err("Could not setup DMA mask for udmabuf device\n"); misc_deregister(&udmabuf_misc); return ret; } return 0; } static void __exit udmabuf_dev_exit(void) { misc_deregister(&udmabuf_misc); } module_init(udmabuf_dev_init) module_exit(udmabuf_dev_exit) MODULE_AUTHOR("Gerd Hoffmann <kraxel@redhat.com>");
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