| /* |
| * (C) COPYRIGHT 2020 ARM Limited. All rights reserved. |
| * |
| * 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. |
| * |
| * SPDX-License-Identifier: GPL-2.0-only |
| */ |
| |
| /**************************************************************************** |
| * Includes |
| ****************************************************************************/ |
| |
| #include "ethosu_buffer.h" |
| |
| #include "ethosu_device.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/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 long ethosu_buffer_ioctl(struct file *file, |
| unsigned int cmd, |
| unsigned long arg); |
| |
| static const struct file_operations ethosu_buffer_fops = { |
| .release = ðosu_buffer_release, |
| .mmap = ðosu_buffer_mmap, |
| .unlocked_ioctl = ðosu_buffer_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = ðosu_buffer_ioctl, |
| #endif |
| }; |
| |
| /**************************************************************************** |
| * Functions |
| ****************************************************************************/ |
| |
| /* |
| * The 'dma-ranges' device tree property for shared dma memory does not seem |
| * to be fully supported for coherent memory. Therefor we apply the DMA range |
| * offset ourselves. |
| */ |
| static dma_addr_t ethosu_buffer_dma_ranges(struct device *dev, |
| dma_addr_t dma_addr) |
| { |
| struct device_node *node = dev->of_node; |
| const __be32 *ranges; |
| int len; |
| int naddr; |
| int nsize; |
| int inc; |
| int i; |
| |
| if (!node) |
| return dma_addr; |
| |
| /* Get the #address-cells and #size-cells properties */ |
| naddr = of_n_addr_cells(node); |
| nsize = of_n_size_cells(node); |
| |
| /* Read the 'dma-ranges' property */ |
| ranges = of_get_property(node, "dma-ranges", &len); |
| if (!ranges || len <= 0) |
| return dma_addr; |
| |
| dev_dbg(dev, "ranges=%p, len=%d, naddr=%d, nsize=%d\n", |
| ranges, len, naddr, nsize); |
| |
| len /= sizeof(*ranges); |
| inc = naddr + naddr + nsize; |
| |
| for (i = 0; (i + inc) <= len; i += inc) { |
| dma_addr_t daddr; |
| dma_addr_t paddr; |
| dma_addr_t size; |
| |
| daddr = of_read_number(&ranges[i], naddr); |
| paddr = of_read_number(&ranges[i + naddr], naddr); |
| size = of_read_number(&ranges[i + naddr + naddr], nsize); |
| |
| dev_dbg(dev, "daddr=0x%llx, paddr=0x%llx, size=0x%llx\n", |
| daddr, paddr, size); |
| |
| if (dma_addr >= paddr && dma_addr < (paddr + size)) |
| return dma_addr + daddr - paddr; |
| } |
| |
| return dma_addr; |
| } |
| |
| 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); |
| |
| dev_info(buf->edev->dev, "Buffer destroy. handle=0x%pK\n", buf); |
| |
| dma_free_coherent(buf->edev->dev, buf->capacity, buf->cpu_addr, |
| buf->dma_addr_orig); |
| devm_kfree(buf->edev->dev, buf); |
| } |
| |
| static int ethosu_buffer_release(struct inode *inode, |
| struct file *file) |
| { |
| struct ethosu_buffer *buf = file->private_data; |
| |
| dev_info(buf->edev->dev, "Buffer release. handle=0x%pK\n", 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; |
| int ret; |
| |
| dev_info(buf->edev->dev, "Buffer mmap. handle=0x%pK\n", buf); |
| |
| ret = dma_mmap_coherent(buf->edev->dev, vma, buf->cpu_addr, |
| buf->dma_addr_orig, |
| buf->capacity); |
| |
| return ret; |
| } |
| |
| static long ethosu_buffer_ioctl(struct file *file, |
| unsigned int cmd, |
| unsigned long arg) |
| { |
| struct ethosu_buffer *buf = file->private_data; |
| void __user *udata = (void __user *)arg; |
| int ret = -EINVAL; |
| |
| ret = mutex_lock_interruptible(&buf->edev->mutex); |
| if (ret) |
| return ret; |
| |
| dev_info(buf->edev->dev, "Ioctl. cmd=%u, arg=%lu\n", cmd, arg); |
| |
| switch (cmd) { |
| case ETHOSU_IOCTL_BUFFER_SET: { |
| struct ethosu_uapi_buffer uapi; |
| |
| if (copy_from_user(&uapi, udata, sizeof(uapi))) |
| break; |
| |
| dev_info(buf->edev->dev, |
| "Ioctl: Buffer set. size=%u, offset=%u\n", |
| uapi.size, uapi.offset); |
| |
| ret = ethosu_buffer_resize(buf, uapi.size, uapi.offset); |
| break; |
| } |
| case ETHOSU_IOCTL_BUFFER_GET: { |
| struct ethosu_uapi_buffer uapi; |
| |
| uapi.size = buf->size; |
| uapi.offset = buf->offset; |
| |
| dev_info(buf->edev->dev, |
| "Ioctl: Buffer get. size=%u, offset=%u\n", |
| uapi.size, uapi.offset); |
| |
| if (copy_to_user(udata, &uapi, sizeof(uapi))) |
| break; |
| |
| ret = 0; |
| break; |
| } |
| default: { |
| dev_err(buf->edev->dev, "Invalid ioctl. cmd=%u, arg=%lu", |
| cmd, arg); |
| break; |
| } |
| } |
| |
| mutex_unlock(&buf->edev->mutex); |
| |
| return ret; |
| } |
| |
| int ethosu_buffer_create(struct ethosu_device *edev, |
| size_t capacity) |
| { |
| struct ethosu_buffer *buf; |
| int ret = -ENOMEM; |
| |
| buf = devm_kzalloc(edev->dev, sizeof(*buf), GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| buf->edev = edev; |
| buf->capacity = capacity; |
| buf->offset = 0; |
| buf->size = 0; |
| kref_init(&buf->kref); |
| |
| buf->cpu_addr = dma_alloc_coherent(buf->edev->dev, capacity, |
| &buf->dma_addr_orig, GFP_KERNEL); |
| if (!buf->cpu_addr) |
| goto free_buf; |
| |
| buf->dma_addr = ethosu_buffer_dma_ranges(buf->edev->dev, |
| buf->dma_addr_orig); |
| |
| ret = anon_inode_getfd("ethosu-buffer", ðosu_buffer_fops, buf, |
| O_RDWR | O_CLOEXEC); |
| if (ret < 0) |
| goto free_dma; |
| |
| buf->file = fget(ret); |
| fput(buf->file); |
| |
| dev_info(buf->edev->dev, |
| "Buffer create. handle=0x%pK, capacity=%zu, cpu_addr=0x%pK, dma_addr=0x%llx, dma_addr_orig=0x%llx, phys_addr=0x%llx\n", |
| buf, capacity, buf->cpu_addr, buf->dma_addr, |
| buf->dma_addr_orig, virt_to_phys(buf->cpu_addr)); |
| |
| return ret; |
| |
| free_dma: |
| dma_free_coherent(buf->edev->dev, buf->capacity, buf->cpu_addr, |
| buf->dma_addr_orig); |
| |
| free_buf: |
| devm_kfree(buf->edev->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); |
| } |
| |
| int ethosu_buffer_resize(struct ethosu_buffer *buf, |
| size_t size, |
| size_t offset) |
| { |
| if ((size + offset) > buf->capacity) |
| return -EINVAL; |
| |
| buf->size = size; |
| buf->offset = offset; |
| |
| return 0; |
| } |