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This allows the user driver to be able to import the external dmabuf and use it from user space. Signed-off-by: Hyun Kwon --- drivers/uio/Makefile | 2 +- drivers/uio/uio.c | 43 +++++++++ drivers/uio/uio_dmabuf.c | 210 +++++++++++++++++++++++++++++++++++++++++++ drivers/uio/uio_dmabuf.h | 26 ++++++ include/uapi/linux/uio/uio.h | 33 +++++++ 5 files changed, 313 insertions(+), 1 deletion(-) create mode 100644 drivers/uio/uio_dmabuf.c create mode 100644 drivers/uio/uio_dmabuf.h create mode 100644 include/uapi/linux/uio/uio.h diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile index c285dd2..5da16c7 100644 --- a/drivers/uio/Makefile +++ b/drivers/uio/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_UIO) += uio.o +obj-$(CONFIG_UIO) += uio.o uio_dmabuf.o obj-$(CONFIG_UIO_CIF) += uio_cif.o obj-$(CONFIG_UIO_PDRV_GENIRQ) += uio_pdrv_genirq.o obj-$(CONFIG_UIO_DMEM_GENIRQ) += uio_dmem_genirq.o diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 1313422..6841f98 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -24,6 +24,12 @@ #include #include #include +#include +#include + +#include + +#include "uio_dmabuf.h" #define UIO_MAX_DEVICES (1U << MINORBITS) @@ -454,6 +460,8 @@ static irqreturn_t uio_interrupt(int irq, void *dev_id) struct uio_listener { struct uio_device *dev; s32 event_count; + struct list_head dbufs; + struct mutex dbufs_lock; /* protect @dbufs */ }; static int uio_open(struct inode *inode, struct file *filep) @@ -500,6 +508,9 @@ static int uio_open(struct inode *inode, struct file *filep) if (ret) goto err_infoopen; + INIT_LIST_HEAD(&listener->dbufs); + mutex_init(&listener->dbufs_lock); + return 0; err_infoopen: @@ -529,6 +540,10 @@ static int uio_release(struct inode *inode, struct file *filep) struct uio_listener *listener = filep->private_data; struct uio_device *idev = listener->dev; + ret = uio_dmabuf_cleanup(idev, &listener->dbufs, &listener->dbufs_lock); + if (ret) + dev_err(&idev->dev, "failed to clean up the dma bufs\n"); + mutex_lock(&idev->info_lock); if (idev->info && idev->info->release) ret = idev->info->release(idev->info, inode); @@ -652,6 +667,33 @@ static ssize_t uio_write(struct file *filep, const char __user *buf, return retval ? retval : sizeof(s32); } +static long uio_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) +{ + struct uio_listener *listener = filep->private_data; + struct uio_device *idev = listener->dev; + long ret; + + if (!idev->info) + return -EIO; + + switch (cmd) { + case UIO_IOC_MAP_DMABUF: + ret = uio_dmabuf_map(idev, &listener->dbufs, + &listener->dbufs_lock, (void __user *)arg); + break; + case UIO_IOC_UNMAP_DMABUF: + ret = uio_dmabuf_unmap(idev, &listener->dbufs, + &listener->dbufs_lock, + (void __user *)arg); + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + static int uio_find_mem_index(struct vm_area_struct *vma) { struct uio_device *idev = vma->vm_private_data; @@ -821,6 +863,7 @@ static const struct file_operations uio_fops = { .write = uio_write, .mmap = uio_mmap, .poll = uio_poll, + .unlocked_ioctl = uio_ioctl, .fasync = uio_fasync, .llseek = noop_llseek, }; diff --git a/drivers/uio/uio_dmabuf.c b/drivers/uio/uio_dmabuf.c new file mode 100644 index 0000000..b18f146 --- /dev/null +++ b/drivers/uio/uio_dmabuf.c @@ -0,0 +1,210 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Xilinx, Inc. + * + * Author: Hyun Woo Kwon + * + * DMA buf support for UIO device + * + */ + +#include +#include +#include +#include +#include +#include + +#include + +#include "uio_dmabuf.h" + +struct uio_dmabuf_mem { + int dbuf_fd; + struct dma_buf *dbuf; + struct dma_buf_attachment *dbuf_attach; + struct sg_table *sgt; + enum dma_data_direction dir; + struct list_head list; +}; + +long uio_dmabuf_map(struct uio_device *dev, struct list_head *dbufs, + struct mutex *dbufs_lock, void __user *user_args) +{ + struct uio_dmabuf_args args; + struct uio_dmabuf_mem *dbuf_mem; + struct dma_buf *dbuf; + struct dma_buf_attachment *dbuf_attach; + enum dma_data_direction dir; + struct sg_table *sgt; + long ret; + + if (copy_from_user(&args, user_args, sizeof(args))) { + ret = -EFAULT; + dev_err(dev->dev.parent, "failed to copy from user\n"); + goto err; + } + + dbuf = dma_buf_get(args.dbuf_fd); + if (IS_ERR(dbuf)) { + dev_err(dev->dev.parent, "failed to get dmabuf\n"); + return PTR_ERR(dbuf); + } + + dbuf_attach = dma_buf_attach(dbuf, dev->dev.parent); + if (IS_ERR(dbuf_attach)) { + dev_err(dev->dev.parent, "failed to attach dmabuf\n"); + ret = PTR_ERR(dbuf_attach); + goto err_put; + } + + switch (args.dir) { + case UIO_DMABUF_DIR_BIDIR: + dir = DMA_BIDIRECTIONAL; + break; + case UIO_DMABUF_DIR_TO_DEV: + dir = DMA_TO_DEVICE; + break; + case UIO_DMABUF_DIR_FROM_DEV: + dir = DMA_FROM_DEVICE; + break; + default: + /* Not needed with check. Just here for any future change */ + dev_err(dev->dev.parent, "invalid direction\n"); + ret = -EINVAL; + goto err_detach; + } + + sgt = dma_buf_map_attachment(dbuf_attach, dir); + if (IS_ERR(sgt)) { + dev_err(dev->dev.parent, "failed to get dmabuf scatterlist\n"); + ret = PTR_ERR(sgt); + goto err_detach; + } + + /* Accept only contiguous one */ + if (sgt->nents != 1) { + dma_addr_t next_addr = sg_dma_address(sgt->sgl); + struct scatterlist *s; + unsigned int i; + + for_each_sg(sgt->sgl, s, sgt->nents, i) { + if (!sg_dma_len(s)) + continue; + + if (sg_dma_address(s) != next_addr) { + dev_err(dev->dev.parent, + "dmabuf not contiguous\n"); + ret = -EINVAL; + goto err_unmap; + } + + next_addr = sg_dma_address(s) + sg_dma_len(s); + } + } + + dbuf_mem = kzalloc(sizeof(*dbuf_mem), GFP_KERNEL); + if (!dbuf_mem) { + ret = -ENOMEM; + goto err_unmap; + } + + dbuf_mem->dbuf_fd = args.dbuf_fd; + dbuf_mem->dbuf = dbuf; + dbuf_mem->dbuf_attach = dbuf_attach; + dbuf_mem->sgt = sgt; + dbuf_mem->dir = dir; + args.dma_addr = sg_dma_address(sgt->sgl); + args.size = dbuf->size; + + if (copy_to_user(user_args, &args, sizeof(args))) { + ret = -EFAULT; + dev_err(dev->dev.parent, "failed to copy to user\n"); + goto err_free; + } + + mutex_lock(dbufs_lock); + list_add(&dbuf_mem->list, dbufs); + mutex_unlock(dbufs_lock); + + return 0; + +err_free: + kfree(dbuf_mem); +err_unmap: + dma_buf_unmap_attachment(dbuf_attach, sgt, dir); +err_detach: + dma_buf_detach(dbuf, dbuf_attach); +err_put: + dma_buf_put(dbuf); +err: + return ret; +} + +long uio_dmabuf_unmap(struct uio_device *dev, struct list_head *dbufs, + struct mutex *dbufs_lock, void __user *user_args) + +{ + struct uio_dmabuf_args args; + struct uio_dmabuf_mem *dbuf_mem; + long ret; + + if (copy_from_user(&args, user_args, sizeof(args))) { + ret = -EFAULT; + goto err; + } + + mutex_lock(dbufs_lock); + list_for_each_entry(dbuf_mem, dbufs, list) { + if (dbuf_mem->dbuf_fd == args.dbuf_fd) + break; + } + + if (dbuf_mem->dbuf_fd != args.dbuf_fd) { + dev_err(dev->dev.parent, "failed to find the dmabuf (%d)\n", + args.dbuf_fd); + ret = -EINVAL; + goto err_unlock; + } + list_del(&dbuf_mem->list); + mutex_unlock(dbufs_lock); + + dma_buf_unmap_attachment(dbuf_mem->dbuf_attach, dbuf_mem->sgt, + dbuf_mem->dir); + dma_buf_detach(dbuf_mem->dbuf, dbuf_mem->dbuf_attach); + dma_buf_put(dbuf_mem->dbuf); + kfree(dbuf_mem); + + memset(&args, 0x0, sizeof(args)); + + if (copy_to_user(user_args, &args, sizeof(args))) { + ret = -EFAULT; + goto err; + } + + return 0; + +err_unlock: + mutex_unlock(dbufs_lock); +err: + return ret; +} + +int uio_dmabuf_cleanup(struct uio_device *dev, struct list_head *dbufs, + struct mutex *dbufs_lock) +{ + struct uio_dmabuf_mem *dbuf_mem, *next; + + mutex_lock(dbufs_lock); + list_for_each_entry_safe(dbuf_mem, next, dbufs, list) { + list_del(&dbuf_mem->list); + dma_buf_unmap_attachment(dbuf_mem->dbuf_attach, dbuf_mem->sgt, + dbuf_mem->dir); + dma_buf_detach(dbuf_mem->dbuf, dbuf_mem->dbuf_attach); + dma_buf_put(dbuf_mem->dbuf); + kfree(dbuf_mem); + } + mutex_unlock(dbufs_lock); + + return 0; +} diff --git a/drivers/uio/uio_dmabuf.h b/drivers/uio/uio_dmabuf.h new file mode 100644 index 0000000..3020030 --- /dev/null +++ b/drivers/uio/uio_dmabuf.h @@ -0,0 +1,26 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Xilinx, Inc. + * + * Author: Hyun Woo Kwon + * + * DMA buf support for UIO device + * + */ + +#ifndef _UIO_DMABUF_H_ +#define _UIO_DMABUF_H_ + +struct uio_device; +struct list_head; +struct mutex; + +long uio_dmabuf_map(struct uio_device *dev, struct list_head *dbufs, + struct mutex *dbufs_lock, void __user *user_args); +long uio_dmabuf_unmap(struct uio_device *dev, struct list_head *dbufs, + struct mutex *dbufs_lock, void __user *user_args); + +int uio_dmabuf_cleanup(struct uio_device *dev, struct list_head *dbufs, + struct mutex *dbufs_lock); + +#endif diff --git a/include/uapi/linux/uio/uio.h b/include/uapi/linux/uio/uio.h new file mode 100644 index 0000000..298bfd7 --- /dev/null +++ b/include/uapi/linux/uio/uio.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * The header for UIO driver + * + * Copyright (C) 2019 Xilinx, Inc. + * + * Author: Hyun Woo Kwon + */ + +#ifndef _UAPI_UIO_UIO_H_ +#define _UAPI_UIO_UIO_H_ + +#include +#include + +#define UIO_DMABUF_DIR_BIDIR 1 +#define UIO_DMABUF_DIR_TO_DEV 2 +#define UIO_DMABUF_DIR_FROM_DEV 3 +#define UIO_DMABUF_DIR_NONE 4 + +struct uio_dmabuf_args { + __s32 dbuf_fd; + __u64 dma_addr; + __u64 size; + __u32 dir; +}; + +#define UIO_IOC_BASE 'U' + +#define UIO_IOC_MAP_DMABUF _IOWR(UIO_IOC_BASE, 0x1, struct uio_dmabuf_args) +#define UIO_IOC_UNMAP_DMABUF _IOWR(UIO_IOC_BASE, 0x2, struct uio_dmabuf_args) + +#endif