// SPDX-License-Identifier: GPL-2.0
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/*
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* Framework for userspace DMA-BUF allocations
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*
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* Copyright (C) 2011 Google, Inc.
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* Copyright (C) 2019 Linaro Ltd.
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* Copyright (C) 2022 Rockchip Electronics Co. Ltd.
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* Author: Simon Xue <xxm@rock-chips.com>
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*/
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#include <linux/cma.h>
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#include <linux/cdev.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/dma-buf.h>
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#include <linux/dma-resv.h>
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#include <linux/dma-map-ops.h>
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#include <linux/err.h>
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#include <linux/xarray.h>
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#include <linux/list.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/syscalls.h>
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#include <uapi/linux/rk-dma-heap.h>
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#include "rk-dma-heap.h"
|
|
#define DEVNAME "rk_dma_heap"
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#define NUM_HEAP_MINORS 128
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static LIST_HEAD(rk_heap_list);
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static DEFINE_MUTEX(rk_heap_list_lock);
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static dev_t rk_dma_heap_devt;
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static struct class *rk_dma_heap_class;
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static DEFINE_XARRAY_ALLOC(rk_dma_heap_minors);
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struct proc_dir_entry *proc_rk_dma_heap_dir;
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#define K(size) ((unsigned long)((size) >> 10))
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static int rk_vmap_pfn_apply(pte_t *pte, unsigned long addr, void *private)
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{
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struct rk_vmap_pfn_data *data = private;
|
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*pte = pte_mkspecial(pfn_pte(data->pfn++, data->prot));
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return 0;
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}
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void *rk_vmap_contig_pfn(unsigned long pfn, unsigned int count, pgprot_t prot)
|
{
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struct rk_vmap_pfn_data data = { .pfn = pfn, .prot = pgprot_nx(prot) };
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struct vm_struct *area;
|
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area = get_vm_area_caller(count * PAGE_SIZE, VM_MAP,
|
__builtin_return_address(0));
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if (!area)
|
return NULL;
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if (apply_to_page_range(&init_mm, (unsigned long)area->addr,
|
count * PAGE_SIZE, rk_vmap_pfn_apply, &data)) {
|
free_vm_area(area);
|
return NULL;
|
}
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return area->addr;
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}
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int rk_dma_heap_set_dev(struct device *heap_dev)
|
{
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int err = 0;
|
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if (!heap_dev)
|
return -EINVAL;
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dma_coerce_mask_and_coherent(heap_dev, DMA_BIT_MASK(64));
|
|
if (!heap_dev->dma_parms) {
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heap_dev->dma_parms = devm_kzalloc(heap_dev,
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sizeof(*heap_dev->dma_parms),
|
GFP_KERNEL);
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if (!heap_dev->dma_parms)
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return -ENOMEM;
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err = dma_set_max_seg_size(heap_dev, (unsigned int)DMA_BIT_MASK(64));
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if (err) {
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devm_kfree(heap_dev, heap_dev->dma_parms);
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dev_err(heap_dev, "Failed to set DMA segment size, err:%d\n", err);
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return err;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(rk_dma_heap_set_dev);
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struct rk_dma_heap *rk_dma_heap_find(const char *name)
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{
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struct rk_dma_heap *h;
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mutex_lock(&rk_heap_list_lock);
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list_for_each_entry(h, &rk_heap_list, list) {
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if (!strcmp(h->name, name)) {
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kref_get(&h->refcount);
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mutex_unlock(&rk_heap_list_lock);
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return h;
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}
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}
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mutex_unlock(&rk_heap_list_lock);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(rk_dma_heap_find);
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void rk_dma_heap_buffer_free(struct dma_buf *dmabuf)
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{
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dma_buf_put(dmabuf);
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}
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EXPORT_SYMBOL_GPL(rk_dma_heap_buffer_free);
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struct dma_buf *rk_dma_heap_buffer_alloc(struct rk_dma_heap *heap, size_t len,
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unsigned int fd_flags,
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unsigned int heap_flags,
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const char *name)
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{
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struct dma_buf *dmabuf;
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if (fd_flags & ~RK_DMA_HEAP_VALID_FD_FLAGS)
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return ERR_PTR(-EINVAL);
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if (heap_flags & ~RK_DMA_HEAP_VALID_HEAP_FLAGS)
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return ERR_PTR(-EINVAL);
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/*
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* Allocations from all heaps have to begin
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* and end on page boundaries.
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*/
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len = PAGE_ALIGN(len);
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if (!len)
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return ERR_PTR(-EINVAL);
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dmabuf = heap->ops->allocate(heap, len, fd_flags, heap_flags, name);
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if (IS_ENABLED(CONFIG_DMABUF_RK_HEAPS_DEBUG) && !IS_ERR(dmabuf))
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dma_buf_set_name(dmabuf, name);
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return dmabuf;
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}
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EXPORT_SYMBOL_GPL(rk_dma_heap_buffer_alloc);
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int rk_dma_heap_bufferfd_alloc(struct rk_dma_heap *heap, size_t len,
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unsigned int fd_flags,
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unsigned int heap_flags,
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const char *name)
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{
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struct dma_buf *dmabuf;
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int fd;
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dmabuf = rk_dma_heap_buffer_alloc(heap, len, fd_flags, heap_flags,
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name);
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if (IS_ERR(dmabuf))
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return PTR_ERR(dmabuf);
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fd = dma_buf_fd(dmabuf, fd_flags);
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if (fd < 0) {
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dma_buf_put(dmabuf);
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/* just return, as put will call release and that will free */
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}
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return fd;
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}
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EXPORT_SYMBOL_GPL(rk_dma_heap_bufferfd_alloc);
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struct page *rk_dma_heap_alloc_contig_pages(struct rk_dma_heap *heap,
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size_t len, const char *name)
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{
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if (!heap->support_cma) {
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WARN_ON(!heap->support_cma);
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return ERR_PTR(-EINVAL);
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}
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len = PAGE_ALIGN(len);
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if (!len)
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return ERR_PTR(-EINVAL);
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return heap->ops->alloc_contig_pages(heap, len, name);
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}
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EXPORT_SYMBOL_GPL(rk_dma_heap_alloc_contig_pages);
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void rk_dma_heap_free_contig_pages(struct rk_dma_heap *heap,
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struct page *pages, size_t len,
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const char *name)
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{
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if (!heap->support_cma) {
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WARN_ON(!heap->support_cma);
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return;
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}
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return heap->ops->free_contig_pages(heap, pages, len, name);
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}
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EXPORT_SYMBOL_GPL(rk_dma_heap_free_contig_pages);
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void rk_dma_heap_total_inc(struct rk_dma_heap *heap, size_t len)
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{
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mutex_lock(&rk_heap_list_lock);
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heap->total_size += len;
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mutex_unlock(&rk_heap_list_lock);
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}
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void rk_dma_heap_total_dec(struct rk_dma_heap *heap, size_t len)
|
{
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mutex_lock(&rk_heap_list_lock);
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if (WARN_ON(heap->total_size < len))
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heap->total_size = 0;
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else
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heap->total_size -= len;
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mutex_unlock(&rk_heap_list_lock);
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}
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static int rk_dma_heap_open(struct inode *inode, struct file *file)
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{
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struct rk_dma_heap *heap;
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heap = xa_load(&rk_dma_heap_minors, iminor(inode));
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if (!heap) {
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pr_err("dma_heap: minor %d unknown.\n", iminor(inode));
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return -ENODEV;
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}
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/* instance data as context */
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file->private_data = heap;
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nonseekable_open(inode, file);
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|
return 0;
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}
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static long rk_dma_heap_ioctl_allocate(struct file *file, void *data)
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{
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struct rk_dma_heap_allocation_data *heap_allocation = data;
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struct rk_dma_heap *heap = file->private_data;
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int fd;
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if (heap_allocation->fd)
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return -EINVAL;
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fd = rk_dma_heap_bufferfd_alloc(heap, heap_allocation->len,
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heap_allocation->fd_flags,
|
heap_allocation->heap_flags, NULL);
|
if (fd < 0)
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return fd;
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heap_allocation->fd = fd;
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return 0;
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}
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static unsigned int rk_dma_heap_ioctl_cmds[] = {
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RK_DMA_HEAP_IOCTL_ALLOC,
|
};
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static long rk_dma_heap_ioctl(struct file *file, unsigned int ucmd,
|
unsigned long arg)
|
{
|
char stack_kdata[128];
|
char *kdata = stack_kdata;
|
unsigned int kcmd;
|
unsigned int in_size, out_size, drv_size, ksize;
|
int nr = _IOC_NR(ucmd);
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int ret = 0;
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if (nr >= ARRAY_SIZE(rk_dma_heap_ioctl_cmds))
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return -EINVAL;
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/* Get the kernel ioctl cmd that matches */
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kcmd = rk_dma_heap_ioctl_cmds[nr];
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/* Figure out the delta between user cmd size and kernel cmd size */
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drv_size = _IOC_SIZE(kcmd);
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out_size = _IOC_SIZE(ucmd);
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in_size = out_size;
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if ((ucmd & kcmd & IOC_IN) == 0)
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in_size = 0;
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if ((ucmd & kcmd & IOC_OUT) == 0)
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out_size = 0;
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ksize = max(max(in_size, out_size), drv_size);
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/* If necessary, allocate buffer for ioctl argument */
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if (ksize > sizeof(stack_kdata)) {
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kdata = kmalloc(ksize, GFP_KERNEL);
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if (!kdata)
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return -ENOMEM;
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}
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if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
|
ret = -EFAULT;
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goto err;
|
}
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/* zero out any difference between the kernel/user structure size */
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if (ksize > in_size)
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memset(kdata + in_size, 0, ksize - in_size);
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|
switch (kcmd) {
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case RK_DMA_HEAP_IOCTL_ALLOC:
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ret = rk_dma_heap_ioctl_allocate(file, kdata);
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break;
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default:
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ret = -ENOTTY;
|
goto err;
|
}
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|
if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
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ret = -EFAULT;
|
err:
|
if (kdata != stack_kdata)
|
kfree(kdata);
|
return ret;
|
}
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static const struct file_operations rk_dma_heap_fops = {
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.owner = THIS_MODULE,
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.open = rk_dma_heap_open,
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.unlocked_ioctl = rk_dma_heap_ioctl,
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#ifdef CONFIG_COMPAT
|
.compat_ioctl = rk_dma_heap_ioctl,
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#endif
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};
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/**
|
* rk_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.
|
*/
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void *rk_dma_heap_get_drvdata(struct rk_dma_heap *heap)
|
{
|
return heap->priv;
|
}
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static void rk_dma_heap_release(struct kref *ref)
|
{
|
struct rk_dma_heap *heap = container_of(ref, struct rk_dma_heap, refcount);
|
int minor = MINOR(heap->heap_devt);
|
|
/* Note, we already holding the rk_heap_list_lock here */
|
list_del(&heap->list);
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device_destroy(rk_dma_heap_class, heap->heap_devt);
|
cdev_del(&heap->heap_cdev);
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xa_erase(&rk_dma_heap_minors, minor);
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|
kfree(heap);
|
}
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void rk_dma_heap_put(struct rk_dma_heap *h)
|
{
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/*
|
* Take the rk_heap_list_lock now to avoid racing with code
|
* scanning the list and then taking a kref.
|
*/
|
mutex_lock(&rk_heap_list_lock);
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kref_put(&h->refcount, rk_dma_heap_release);
|
mutex_unlock(&rk_heap_list_lock);
|
}
|
|
/**
|
* rk_dma_heap_get_dev() - get device struct for the heap
|
* @heap: DMA-Heap to retrieve device struct from
|
*
|
* Returns:
|
* The device struct for the heap.
|
*/
|
struct device *rk_dma_heap_get_dev(struct rk_dma_heap *heap)
|
{
|
return heap->heap_dev;
|
}
|
|
/**
|
* rk_dma_heap_get_name() - get heap name
|
* @heap: DMA-Heap to retrieve private data for
|
*
|
* Returns:
|
* The char* for the heap name.
|
*/
|
const char *rk_dma_heap_get_name(struct rk_dma_heap *heap)
|
{
|
return heap->name;
|
}
|
|
struct rk_dma_heap *rk_dma_heap_add(const struct rk_dma_heap_export_info *exp_info)
|
{
|
struct rk_dma_heap *heap, *err_ret;
|
unsigned int minor;
|
int ret;
|
|
if (!exp_info->name || !strcmp(exp_info->name, "")) {
|
pr_err("rk_dma_heap: Cannot add heap without a name\n");
|
return ERR_PTR(-EINVAL);
|
}
|
|
if (!exp_info->ops || !exp_info->ops->allocate) {
|
pr_err("rk_dma_heap: Cannot add heap with invalid ops struct\n");
|
return ERR_PTR(-EINVAL);
|
}
|
|
/* check the name is unique */
|
heap = rk_dma_heap_find(exp_info->name);
|
if (heap) {
|
pr_err("rk_dma_heap: Already registered heap named %s\n",
|
exp_info->name);
|
rk_dma_heap_put(heap);
|
return ERR_PTR(-EINVAL);
|
}
|
|
heap = kzalloc(sizeof(*heap), GFP_KERNEL);
|
if (!heap)
|
return ERR_PTR(-ENOMEM);
|
|
kref_init(&heap->refcount);
|
heap->name = exp_info->name;
|
heap->ops = exp_info->ops;
|
heap->priv = exp_info->priv;
|
heap->support_cma = exp_info->support_cma;
|
INIT_LIST_HEAD(&heap->dmabuf_list);
|
INIT_LIST_HEAD(&heap->contig_list);
|
mutex_init(&heap->dmabuf_lock);
|
mutex_init(&heap->contig_lock);
|
|
/* Find unused minor number */
|
ret = xa_alloc(&rk_dma_heap_minors, &minor, heap,
|
XA_LIMIT(0, NUM_HEAP_MINORS - 1), GFP_KERNEL);
|
if (ret < 0) {
|
pr_err("rk_dma_heap: Unable to get minor number for heap\n");
|
err_ret = ERR_PTR(ret);
|
goto err0;
|
}
|
|
/* Create device */
|
heap->heap_devt = MKDEV(MAJOR(rk_dma_heap_devt), minor);
|
|
cdev_init(&heap->heap_cdev, &rk_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;
|
}
|
|
heap->heap_dev = device_create(rk_dma_heap_class,
|
NULL,
|
heap->heap_devt,
|
NULL,
|
heap->name);
|
if (IS_ERR(heap->heap_dev)) {
|
pr_err("rk_dma_heap: Unable to create device\n");
|
err_ret = ERR_CAST(heap->heap_dev);
|
goto err2;
|
}
|
|
heap->procfs = proc_rk_dma_heap_dir;
|
|
/* Make sure it doesn't disappear on us */
|
heap->heap_dev = get_device(heap->heap_dev);
|
|
/* Add heap to the list */
|
mutex_lock(&rk_heap_list_lock);
|
list_add(&heap->list, &rk_heap_list);
|
mutex_unlock(&rk_heap_list_lock);
|
|
return heap;
|
|
err2:
|
cdev_del(&heap->heap_cdev);
|
err1:
|
xa_erase(&rk_dma_heap_minors, minor);
|
err0:
|
kfree(heap);
|
return err_ret;
|
}
|
|
static char *rk_dma_heap_devnode(struct device *dev, umode_t *mode)
|
{
|
return kasprintf(GFP_KERNEL, "rk_dma_heap/%s", dev_name(dev));
|
}
|
|
static int rk_dma_heap_dump_dmabuf(const struct dma_buf *dmabuf, void *data)
|
{
|
struct rk_dma_heap *heap = (struct rk_dma_heap *)data;
|
struct rk_dma_heap_dmabuf *buf;
|
struct dma_buf_attachment *a;
|
phys_addr_t size;
|
int attach_count;
|
int ret;
|
|
if (!strcmp(dmabuf->exp_name, heap->name)) {
|
seq_printf(heap->s, "dma-heap:<%s> -dmabuf", heap->name);
|
mutex_lock(&heap->dmabuf_lock);
|
list_for_each_entry(buf, &heap->dmabuf_list, node) {
|
if (buf->dmabuf->file->f_inode->i_ino ==
|
dmabuf->file->f_inode->i_ino) {
|
seq_printf(heap->s,
|
"\ti_ino = %ld\n",
|
dmabuf->file->f_inode->i_ino);
|
size = buf->end - buf->start + 1;
|
seq_printf(heap->s,
|
"\tAlloc by (%-20s)\t[%pa-%pa]\t%pa (%lu KiB)\n",
|
dmabuf->name, &buf->start,
|
&buf->end, &size, K(size));
|
seq_puts(heap->s, "\t\tAttached Devices:\n");
|
attach_count = 0;
|
ret = dma_resv_lock_interruptible(dmabuf->resv,
|
NULL);
|
if (ret)
|
goto error_unlock;
|
list_for_each_entry(a, &dmabuf->attachments,
|
node) {
|
seq_printf(heap->s, "\t\t%s\n",
|
dev_name(a->dev));
|
attach_count++;
|
}
|
dma_resv_unlock(dmabuf->resv);
|
seq_printf(heap->s,
|
"Total %d devices attached\n\n",
|
attach_count);
|
}
|
}
|
mutex_unlock(&heap->dmabuf_lock);
|
}
|
|
return 0;
|
error_unlock:
|
mutex_unlock(&heap->dmabuf_lock);
|
return ret;
|
}
|
|
static int rk_dma_heap_dump_contig(void *data)
|
{
|
struct rk_dma_heap *heap = (struct rk_dma_heap *)data;
|
struct rk_dma_heap_contig_buf *buf;
|
phys_addr_t size;
|
|
mutex_lock(&heap->contig_lock);
|
list_for_each_entry(buf, &heap->contig_list, node) {
|
size = buf->end - buf->start + 1;
|
seq_printf(heap->s, "dma-heap:<%s> -non dmabuf\n", heap->name);
|
seq_printf(heap->s, "\tAlloc by (%-20s)\t[%pa-%pa]\t%pa (%lu KiB)\n",
|
buf->orig_alloc, &buf->start, &buf->end, &size, K(size));
|
}
|
mutex_unlock(&heap->contig_lock);
|
|
return 0;
|
}
|
|
static ssize_t rk_total_pools_kb_show(struct kobject *kobj,
|
struct kobj_attribute *attr, char *buf)
|
{
|
struct rk_dma_heap *heap;
|
u64 total_pool_size = 0;
|
|
mutex_lock(&rk_heap_list_lock);
|
list_for_each_entry(heap, &rk_heap_list, list)
|
if (heap->ops->get_pool_size)
|
total_pool_size += heap->ops->get_pool_size(heap);
|
mutex_unlock(&rk_heap_list_lock);
|
|
return sysfs_emit(buf, "%llu\n", total_pool_size / 1024);
|
}
|
|
static struct kobj_attribute rk_total_pools_kb_attr =
|
__ATTR_RO(rk_total_pools_kb);
|
|
static struct attribute *rk_dma_heap_sysfs_attrs[] = {
|
&rk_total_pools_kb_attr.attr,
|
NULL,
|
};
|
|
ATTRIBUTE_GROUPS(rk_dma_heap_sysfs);
|
|
static struct kobject *rk_dma_heap_kobject;
|
|
static int rk_dma_heap_sysfs_setup(void)
|
{
|
int ret;
|
|
rk_dma_heap_kobject = kobject_create_and_add("rk_dma_heap",
|
kernel_kobj);
|
if (!rk_dma_heap_kobject)
|
return -ENOMEM;
|
|
ret = sysfs_create_groups(rk_dma_heap_kobject,
|
rk_dma_heap_sysfs_groups);
|
if (ret) {
|
kobject_put(rk_dma_heap_kobject);
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static void rk_dma_heap_sysfs_teardown(void)
|
{
|
kobject_put(rk_dma_heap_kobject);
|
}
|
|
#ifdef CONFIG_DEBUG_FS
|
|
static struct dentry *rk_dma_heap_debugfs_dir;
|
|
static int rk_dma_heap_debug_show(struct seq_file *s, void *unused)
|
{
|
struct rk_dma_heap *heap;
|
unsigned long total = 0;
|
|
mutex_lock(&rk_heap_list_lock);
|
list_for_each_entry(heap, &rk_heap_list, list) {
|
heap->s = s;
|
get_each_dmabuf(rk_dma_heap_dump_dmabuf, heap);
|
rk_dma_heap_dump_contig(heap);
|
total += heap->total_size;
|
}
|
seq_printf(s, "\nTotal : 0x%lx (%lu KiB)\n", total, K(total));
|
mutex_unlock(&rk_heap_list_lock);
|
|
return 0;
|
}
|
DEFINE_SHOW_ATTRIBUTE(rk_dma_heap_debug);
|
|
static int rk_dma_heap_init_debugfs(void)
|
{
|
struct dentry *d;
|
int err = 0;
|
|
d = debugfs_create_dir("rk_dma_heap", NULL);
|
if (IS_ERR(d))
|
return PTR_ERR(d);
|
|
rk_dma_heap_debugfs_dir = d;
|
|
d = debugfs_create_file("dma_heap_info", 0444,
|
rk_dma_heap_debugfs_dir, NULL,
|
&rk_dma_heap_debug_fops);
|
if (IS_ERR(d)) {
|
dma_heap_print("rk_dma_heap : debugfs: failed to create node bufinfo\n");
|
debugfs_remove_recursive(rk_dma_heap_debugfs_dir);
|
rk_dma_heap_debugfs_dir = NULL;
|
err = PTR_ERR(d);
|
}
|
|
return err;
|
}
|
#else
|
static inline int rk_dma_heap_init_debugfs(void)
|
{
|
return 0;
|
}
|
#endif
|
|
static int rk_dma_heap_proc_show(struct seq_file *s, void *unused)
|
{
|
struct rk_dma_heap *heap;
|
unsigned long total = 0;
|
|
mutex_lock(&rk_heap_list_lock);
|
list_for_each_entry(heap, &rk_heap_list, list) {
|
heap->s = s;
|
get_each_dmabuf(rk_dma_heap_dump_dmabuf, heap);
|
rk_dma_heap_dump_contig(heap);
|
total += heap->total_size;
|
}
|
seq_printf(s, "\nTotal : 0x%lx (%lu KiB)\n", total, K(total));
|
mutex_unlock(&rk_heap_list_lock);
|
|
return 0;
|
}
|
|
static int rk_dma_heap_info_proc_open(struct inode *inode,
|
struct file *file)
|
{
|
return single_open(file, rk_dma_heap_proc_show, NULL);
|
}
|
|
static const struct proc_ops rk_dma_heap_info_proc_fops = {
|
.proc_open = rk_dma_heap_info_proc_open,
|
.proc_read = seq_read,
|
.proc_lseek = seq_lseek,
|
.proc_release = single_release,
|
};
|
|
static int rk_dma_heap_init_proc(void)
|
{
|
proc_rk_dma_heap_dir = proc_mkdir("rk_dma_heap", NULL);
|
if (!proc_rk_dma_heap_dir) {
|
pr_err("create rk_dma_heap proc dir error\n");
|
return -ENOENT;
|
}
|
|
proc_create("dma_heap_info", 0644, proc_rk_dma_heap_dir,
|
&rk_dma_heap_info_proc_fops);
|
|
return 0;
|
}
|
|
static int rk_dma_heap_init(void)
|
{
|
int ret;
|
|
ret = rk_dma_heap_sysfs_setup();
|
if (ret)
|
return ret;
|
|
ret = alloc_chrdev_region(&rk_dma_heap_devt, 0, NUM_HEAP_MINORS,
|
DEVNAME);
|
if (ret)
|
goto err_chrdev;
|
|
rk_dma_heap_class = class_create(THIS_MODULE, DEVNAME);
|
if (IS_ERR(rk_dma_heap_class)) {
|
ret = PTR_ERR(rk_dma_heap_class);
|
goto err_class;
|
}
|
rk_dma_heap_class->devnode = rk_dma_heap_devnode;
|
|
rk_dma_heap_init_debugfs();
|
rk_dma_heap_init_proc();
|
|
return 0;
|
|
err_class:
|
unregister_chrdev_region(rk_dma_heap_devt, NUM_HEAP_MINORS);
|
err_chrdev:
|
rk_dma_heap_sysfs_teardown();
|
return ret;
|
}
|
subsys_initcall(rk_dma_heap_init);
|
