linux-imx
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committed ad94dc3a7ebx
// SPDX-License-Identifier: GPL-2.0 OR MIT/****************************************************************************** * privcmd-buf.c * * Mmap of hypercall buffers. * * Copyright (c) 2018 Juergen Gross */MODULE_LICENSE("GPL");struct privcmd_buf_private { struct mutex lock; struct list_head list;};struct privcmd_buf_vma_private { struct privcmd_buf_private *file_priv; struct list_head list; unsigned int users; unsigned int n_pages; struct page *pages[];};static int privcmd_buf_open(struct inode *ino, struct file *file){ struct privcmd_buf_private *file_priv; file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL); if (!file_priv) return -ENOMEM; mutex_init(&file_priv->lock); INIT_LIST_HEAD(&file_priv->list); file->private_data = file_priv; return 0;}static void privcmd_buf_vmapriv_free(struct privcmd_buf_vma_private *vma_priv){ unsigned int i; list_del(&vma_priv->list); for (i = 0; i < vma_priv->n_pages; i++) __free_page(vma_priv->pages[i]); kfree(vma_priv);}static int privcmd_buf_release(struct inode *ino, struct file *file){ struct privcmd_buf_private *file_priv = file->private_data; struct privcmd_buf_vma_private *vma_priv; mutex_lock(&file_priv->lock); while (!list_empty(&file_priv->list)) { vma_priv = list_first_entry(&file_priv->list, struct privcmd_buf_vma_private, list); privcmd_buf_vmapriv_free(vma_priv); } mutex_unlock(&file_priv->lock); kfree(file_priv); return 0;}static void privcmd_buf_vma_open(struct vm_area_struct *vma){ struct privcmd_buf_vma_private *vma_priv = vma->vm_private_data; if (!vma_priv) return;