diff options
Diffstat (limited to 'drivers/soc/qcom/rmtfs_mem.c')
| -rw-r--r-- | drivers/soc/qcom/rmtfs_mem.c | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c index 7200d762a951..0feaae357821 100644 --- a/drivers/soc/qcom/rmtfs_mem.c +++ b/drivers/soc/qcom/rmtfs_mem.c @@ -1,14 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2017 Linaro Ltd. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/kernel.h> @@ -137,6 +129,26 @@ static struct class rmtfs_class = { .name = "rmtfs", }; +static int qcom_rmtfs_mem_mmap(struct file *filep, struct vm_area_struct *vma) +{ + struct qcom_rmtfs_mem *rmtfs_mem = filep->private_data; + + if (vma->vm_end - vma->vm_start > rmtfs_mem->size) { + dev_dbg(&rmtfs_mem->dev, + "vm_end[%lu] - vm_start[%lu] [%lu] > mem->size[%pa]\n", + vma->vm_end, vma->vm_start, + (vma->vm_end - vma->vm_start), &rmtfs_mem->size); + return -EINVAL; + } + + vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); + return remap_pfn_range(vma, + vma->vm_start, + rmtfs_mem->addr >> PAGE_SHIFT, + vma->vm_end - vma->vm_start, + vma->vm_page_prot); +} + static const struct file_operations qcom_rmtfs_mem_fops = { .owner = THIS_MODULE, .open = qcom_rmtfs_mem_open, @@ -144,6 +156,7 @@ static const struct file_operations qcom_rmtfs_mem_fops = { .write = qcom_rmtfs_mem_write, .release = qcom_rmtfs_mem_release, .llseek = default_llseek, + .mmap = qcom_rmtfs_mem_mmap, }; static void qcom_rmtfs_mem_release_device(struct device *dev) |