| /* |
| * SPDX-FileCopyrightText: Copyright 2020-2024 Arm Limited and/or its affiliates <open-source-office@arm.com> |
| * SPDX-License-Identifier: GPL-2.0-only |
| * |
| * This program is free software and is provided to you under the terms of the |
| * GNU General Public License version 2 as published by the Free Software |
| * Foundation, and any use by you of this program is subject to the terms |
| * of such GNU licence. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, you can access it online at |
| * http://www.gnu.org/licenses/gpl-2.0.html. |
| */ |
| |
| /**************************************************************************** |
| * Includes |
| ****************************************************************************/ |
| |
| #include <common/ethosu_buffer.h> |
| |
| #include <common/ethosu_device.h> |
| #include <common/ethosu_dma_mem.h> |
| #include <uapi/ethosu.h> |
| |
| #include <linux/anon_inodes.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/of_address.h> |
| #include <linux/file.h> |
| #include <linux/fs.h> |
| #include <linux/remoteproc.h> |
| #include <linux/uaccess.h> |
| |
| /**************************************************************************** |
| * Variables |
| ****************************************************************************/ |
| |
| static int ethosu_buffer_release(struct inode *inode, |
| struct file *file); |
| |
| static int ethosu_buffer_mmap(struct file *file, |
| struct vm_area_struct *vma); |
| |
| static loff_t ethosu_buffer_llseek(struct file *file, |
| loff_t offset, |
| int whence); |
| |
| static const struct file_operations ethosu_buffer_fops = { |
| .release = ðosu_buffer_release, |
| .mmap = ðosu_buffer_mmap, |
| .llseek = ðosu_buffer_llseek, |
| }; |
| |
| /**************************************************************************** |
| * Functions |
| ****************************************************************************/ |
| |
| static bool ethosu_buffer_verify(struct file *file) |
| { |
| return file->f_op == ðosu_buffer_fops; |
| } |
| |
| static void ethosu_buffer_destroy(struct kref *kref) |
| { |
| struct ethosu_buffer *buf = |
| container_of(kref, struct ethosu_buffer, kref); |
| struct device *dev = buf->dev; |
| |
| dev_dbg(dev, "Buffer destroy. buf=0x%pK", buf); |
| |
| ethosu_dma_mem_free(&buf->dma_mem); |
| |
| memset(buf, 0, sizeof(*buf)); |
| devm_kfree(dev, buf); |
| } |
| |
| static int ethosu_buffer_release(struct inode *inode, |
| struct file *file) |
| { |
| struct ethosu_buffer *buf = file->private_data; |
| struct device *dev = buf->dev; |
| |
| dev_dbg(dev, "Buffer release. file=0x%pK, buf=0x%pK\n", |
| file, buf); |
| |
| ethosu_buffer_put(buf); |
| |
| return 0; |
| } |
| |
| static int ethosu_buffer_mmap(struct file *file, |
| struct vm_area_struct *vma) |
| { |
| struct ethosu_buffer *buf = file->private_data; |
| struct device *dev = buf->dev; |
| int ret; |
| |
| dev_dbg(dev, "Buffer mmap. file=0x%pK, buf=0x%pK\n", |
| file, buf); |
| |
| ret = dma_mmap_coherent(dev, vma, buf->dma_mem->cpu_addr, |
| buf->dma_mem->dma_addr, buf->dma_mem->size); |
| |
| return ret; |
| } |
| |
| static loff_t ethosu_buffer_llseek(struct file *file, |
| loff_t offset, |
| int whence) |
| { |
| struct ethosu_buffer *buf = file->private_data; |
| |
| if (offset != 0) |
| return -EINVAL; |
| |
| /* |
| * SEEK_END and SEEK_SET is supported with a zero offset to allow buffer |
| * size discovery using seek functions e.g. |
| * size = lseek(buf_fd, 0, SEEK_END); |
| * lseek(buf_fd, 0, SEEK_SET); |
| */ |
| switch (whence) { |
| case SEEK_END: |
| return buf->dma_mem->size; |
| case SEEK_SET: |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| int ethosu_buffer_create(struct device *dev, |
| size_t size) |
| { |
| struct ethosu_buffer *buf; |
| int ret = -ENOMEM; |
| |
| if (!size) { |
| dev_err(dev, "Buffer create. Invalid zero size"); |
| |
| return -EINVAL; |
| } |
| |
| buf = devm_kzalloc(dev, sizeof(*buf), GFP_KERNEL); |
| if (!buf) { |
| dev_err(dev, "Buffer create. Failed to allocate struct"); |
| |
| return -ENOMEM; |
| } |
| |
| buf->dev = dev; |
| kref_init(&buf->kref); |
| |
| buf->dma_mem = ethosu_dma_mem_alloc(dev, size); |
| if (IS_ERR(buf->dma_mem)) { |
| ret = PTR_ERR(buf->dma_mem); |
| dev_err(dev, |
| "Buffer create. Failed to allocate DMA memory. ret=%d", |
| ret); |
| goto free_buf; |
| } |
| |
| ret = anon_inode_getfd("ethosu-buffer", ðosu_buffer_fops, buf, |
| O_RDWR | O_CLOEXEC); |
| if (ret < 0) { |
| dev_err(dev, |
| "Buffer create. Failed to get file descriptor. ret=%d", |
| ret); |
| goto free_dma; |
| } |
| |
| buf->file = fget(ret); |
| buf->file->f_mode |= FMODE_LSEEK; |
| |
| fput(buf->file); |
| |
| dev_dbg(dev, |
| "Buffer create. file=0x%pK, fd=%d, buf=0x%pK, size=%zu, cpu_addr=0x%pK, dma_addr=0x%llx, phys_addr=0x%llx\n", |
| buf->file, ret, buf, size, buf->dma_mem->cpu_addr, |
| buf->dma_mem->dma_addr, virt_to_phys(buf->dma_mem->cpu_addr)); |
| |
| return ret; |
| |
| free_dma: |
| ethosu_dma_mem_free(&buf->dma_mem); |
| |
| free_buf: |
| memset(buf, 0, sizeof(*buf)); |
| devm_kfree(dev, buf); |
| |
| return ret; |
| } |
| |
| struct ethosu_buffer *ethosu_buffer_get_from_fd(int fd) |
| { |
| struct ethosu_buffer *buf; |
| struct file *file; |
| |
| file = fget(fd); |
| if (!file) |
| return ERR_PTR(-EINVAL); |
| |
| if (!ethosu_buffer_verify(file)) { |
| fput(file); |
| |
| return ERR_PTR(-EINVAL); |
| } |
| |
| buf = file->private_data; |
| ethosu_buffer_get(buf); |
| fput(file); |
| |
| return buf; |
| } |
| |
| void ethosu_buffer_get(struct ethosu_buffer *buf) |
| { |
| kref_get(&buf->kref); |
| } |
| |
| void ethosu_buffer_put(struct ethosu_buffer *buf) |
| { |
| kref_put(&buf->kref, ethosu_buffer_destroy); |
| } |