+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Framework for userspace DMA-BUF allocations
- *
- * Copyright (C) 2011 Google, Inc.
- * Copyright (C) 2019 Linaro Ltd.
- */
-
-#include <linux/cdev.h>
-#include <linux/debugfs.h>
-#include <linux/device.h>
-#include <linux/dma-buf.h>
-#include <linux/err.h>
-#include <linux/xarray.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <linux/syscalls.h>
-#include <linux/dma-heap.h>
-#include <uapi/linux/dma-heap.h>
-
-#define DEVNAME "dma_heap"
-
-#define NUM_HEAP_MINORS 128
-
-/**
- * struct dma_heap - represents a dmabuf heap in the system
- * @name: used for debugging/device-node name
- * @ops: ops struct for this heap
- * @minor minor number of this heap device
- * @heap_devt heap device node
- * @heap_cdev heap char device
- *
- * Represents a heap of memory from which buffers can be made.
- */
-struct dma_heap {
- const char *name;
- const struct dma_heap_ops *ops;
- void *priv;
- unsigned int minor;
- dev_t heap_devt;
- struct list_head list;
- struct cdev heap_cdev;
-};
-
-static LIST_HEAD(heap_list);
-static DEFINE_MUTEX(heap_list_lock);
-static dev_t dma_heap_devt;
-static struct class *dma_heap_class;
-static DEFINE_XARRAY_ALLOC(dma_heap_minors);
-
-static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
- unsigned int fd_flags,
- unsigned int heap_flags)
-{
- /*
- * Allocations from all heaps have to begin
- * and end on page boundaries.
- */
- len = PAGE_ALIGN(len);
- if (!len)
- return -EINVAL;
-
- return heap->ops->allocate(heap, len, fd_flags, heap_flags);
-}
-
-static int dma_heap_open(struct inode *inode, struct file *file)
-{
- struct dma_heap *heap;
-
- heap = xa_load(&dma_heap_minors, iminor(inode));
- if (!heap) {
- pr_err("dma_heap: minor %d unknown.\n", iminor(inode));
- return -ENODEV;
- }
-
- /* instance data as context */
- file->private_data = heap;
- nonseekable_open(inode, file);
-
- return 0;
-}
-
-static long dma_heap_ioctl_allocate(struct file *file, unsigned long arg)
-{
- struct dma_heap_allocation_data heap_allocation;
- struct dma_heap *heap = file->private_data;
- int fd;
-
- if (copy_from_user(&heap_allocation, (void __user *)arg,
- sizeof(heap_allocation)))
- return -EFAULT;
-
- if (heap_allocation.fd ||
- heap_allocation.reserved0 ||
- heap_allocation.reserved1) {
- pr_warn_once("dma_heap: ioctl data not valid\n");
- return -EINVAL;
- }
-
- if (heap_allocation.fd_flags & ~DMA_HEAP_VALID_FD_FLAGS) {
- pr_warn_once("dma_heap: fd_flags has invalid or unsupported flags set\n");
- return -EINVAL;
- }
-
- if (heap_allocation.heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS) {
- pr_warn_once("dma_heap: heap flags has invalid or unsupported flags set\n");
- return -EINVAL;
- }
-
- fd = dma_heap_buffer_alloc(heap, heap_allocation.len,
- heap_allocation.fd_flags,
- heap_allocation.heap_flags);
- if (fd < 0)
- return fd;
-
- heap_allocation.fd = fd;
-
- if (copy_to_user((void __user *)arg, &heap_allocation,
- sizeof(heap_allocation))) {
- ksys_close(fd);
- return -EFAULT;
- }
-
- return 0;
-}
-
-static long dma_heap_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- int ret = 0;
-
- switch (cmd) {
- case DMA_HEAP_IOC_ALLOC:
- ret = dma_heap_ioctl_allocate(file, arg);
- break;
- default:
- return -ENOTTY;
- }
-
- return ret;
-}
-
-static const struct file_operations dma_heap_fops = {
- .owner = THIS_MODULE,
- .open = dma_heap_open,
- .unlocked_ioctl = dma_heap_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = dma_heap_ioctl,
-#endif
-};
-
-/**
- * dma_heap_get_drvdata() - get per-subdriver data for the heap
- * @heap: DMA-Heap to retrieve private data for
- *
- * Returns:
- * The per-subdriver data for the heap.
- */
-void *dma_heap_get_drvdata(struct dma_heap *heap)
-{
- return heap->priv;
-}
-
-struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
-{
- struct dma_heap *heap, *h, *err_ret;
- struct device *dev_ret;
- int ret;
-
- if (!exp_info->name || !strcmp(exp_info->name, "")) {
- pr_err("dma_heap: Cannot add heap without a name\n");
- return ERR_PTR(-EINVAL);
- }
-
- if (!exp_info->ops || !exp_info->ops->allocate) {
- pr_err("dma_heap: Cannot add heap with invalid ops struct\n");
- return ERR_PTR(-EINVAL);
- }
-
- /* check the name is unique */
- mutex_lock(&heap_list_lock);
- list_for_each_entry(h, &heap_list, list) {
- if (!strcmp(h->name, exp_info->name)) {
- mutex_unlock(&heap_list_lock);
- pr_err("dma_heap: Already registered heap named %s\n",
- exp_info->name);
- return ERR_PTR(-EINVAL);
- }
- }
- mutex_unlock(&heap_list_lock);
-
- heap = kzalloc(sizeof(*heap), GFP_KERNEL);
- if (!heap)
- return ERR_PTR(-ENOMEM);
-
- heap->name = exp_info->name;
- heap->ops = exp_info->ops;
- heap->priv = exp_info->priv;
-
- /* Find unused minor number */
- ret = xa_alloc(&dma_heap_minors, &heap->minor, heap,
- XA_LIMIT(0, NUM_HEAP_MINORS - 1), GFP_KERNEL);
- if (ret < 0) {
- pr_err("dma_heap: Unable to get minor number for heap\n");
- err_ret = ERR_PTR(ret);
- goto err0;
- }
-
- /* Create device */
- heap->heap_devt = MKDEV(MAJOR(dma_heap_devt), heap->minor);
-
- cdev_init(&heap->heap_cdev, &dma_heap_fops);
- ret = cdev_add(&heap->heap_cdev, heap->heap_devt, 1);
- if (ret < 0) {
- pr_err("dma_heap: Unable to add char device\n");
- err_ret = ERR_PTR(ret);
- goto err1;
- }
-
- dev_ret = device_create(dma_heap_class,
- NULL,
- heap->heap_devt,
- NULL,
- heap->name);
- if (IS_ERR(dev_ret)) {
- pr_err("dma_heap: Unable to create device\n");
- err_ret = ERR_CAST(dev_ret);
- goto err2;
- }
- /* Add heap to the list */
- mutex_lock(&heap_list_lock);
- list_add(&heap->list, &heap_list);
- mutex_unlock(&heap_list_lock);
-
- return heap;
-
-err2:
- cdev_del(&heap->heap_cdev);
-err1:
- xa_erase(&dma_heap_minors, heap->minor);
-err0:
- kfree(heap);
- return err_ret;
-}
-
-static char *dma_heap_devnode(struct device *dev, umode_t *mode)
-{
- return kasprintf(GFP_KERNEL, "dma_heap/%s", dev_name(dev));
-}
-
-static int dma_heap_init(void)
-{
- int ret;
-
- ret = alloc_chrdev_region(&dma_heap_devt, 0, NUM_HEAP_MINORS, DEVNAME);
- if (ret)
- return ret;
-
- dma_heap_class = class_create(THIS_MODULE, DEVNAME);
- if (IS_ERR(dma_heap_class)) {
- unregister_chrdev_region(dma_heap_devt, NUM_HEAP_MINORS);
- return PTR_ERR(dma_heap_class);
- }
- dma_heap_class->devnode = dma_heap_devnode;
-
- return 0;
-}
-subsys_initcall(dma_heap_init);
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * DMABUF Heaps Allocation Infrastructure
- *
- * Copyright (C) 2011 Google, Inc.
- * Copyright (C) 2019 Linaro Ltd.
- */
-
-#ifndef _DMA_HEAPS_H
-#define _DMA_HEAPS_H
-
-#include <linux/cdev.h>
-#include <linux/types.h>
-
-struct dma_heap;
-
-/**
- * struct dma_heap_ops - ops to operate on a given heap
- * @allocate: allocate dmabuf and return fd
- *
- * allocate returns dmabuf fd on success, -errno on error.
- */
-struct dma_heap_ops {
- int (*allocate)(struct dma_heap *heap,
- unsigned long len,
- unsigned long fd_flags,
- unsigned long heap_flags);
-};
-
-/**
- * struct dma_heap_export_info - information needed to export a new dmabuf heap
- * @name: used for debugging/device-node name
- * @ops: ops struct for this heap
- * @priv: heap exporter private data
- *
- * Information needed to export a new dmabuf heap.
- */
-struct dma_heap_export_info {
- const char *name;
- const struct dma_heap_ops *ops;
- void *priv;
-};
-
-/**
- * dma_heap_get_drvdata() - get per-heap driver data
- * @heap: DMA-Heap to retrieve private data for
- *
- * Returns:
- * The per-heap data for the heap.
- */
-void *dma_heap_get_drvdata(struct dma_heap *heap);
-
-/**
- * dma_heap_add - adds a heap to dmabuf heaps
- * @exp_info: information needed to register this heap
- */
-struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
-
-#endif /* _DMA_HEAPS_H */
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-/*
- * DMABUF Heaps Userspace API
- *
- * Copyright (C) 2011 Google, Inc.
- * Copyright (C) 2019 Linaro Ltd.
- */
-#ifndef _UAPI_LINUX_DMABUF_POOL_H
-#define _UAPI_LINUX_DMABUF_POOL_H
-
-#include <linux/ioctl.h>
-#include <linux/types.h>
-
-/**
- * DOC: DMABUF Heaps Userspace API
- */
-
-/* Valid FD_FLAGS are O_CLOEXEC, O_RDONLY, O_WRONLY, O_RDWR */
-#define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)
-
-/* Currently no heap flags */
-#define DMA_HEAP_VALID_HEAP_FLAGS (0)
-
-/**
- * struct dma_heap_allocation_data - metadata passed from userspace for
- * allocations
- * @len: size of the allocation
- * @fd: will be populated with a fd which provdes the
- * handle to the allocated dma-buf
- * @fd_flags: file descriptor flags used when allocating
- * @heap_flags: flags passed to heap
- *
- * Provided by userspace as an argument to the ioctl
- */
-struct dma_heap_allocation_data {
- __u64 len;
- __u32 fd;
- __u32 fd_flags;
- __u64 heap_flags;
- __u32 reserved0;
- __u32 reserved1;
-};
-
-#define DMA_HEAP_IOC_MAGIC 'H'
-
-/**
- * DOC: DMA_HEAP_IOC_ALLOC - allocate memory from pool
- *
- * Takes an dma_heap_allocation_data struct and returns it with the fd field
- * populated with the dmabuf handle of the allocation.
- */
-#define DMA_HEAP_IOC_ALLOC _IOWR(DMA_HEAP_IOC_MAGIC, 0, \
- struct dma_heap_allocation_data)
-
-#endif /* _UAPI_LINUX_DMABUF_POOL_H */
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