// SPDX-License-Identifier: GPL-2.0
|
/*
|
* DMABUF CMA heap exporter
|
*
|
* Copyright (C) 2012, 2019, 2020 Linaro Ltd.
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* Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
|
*
|
* Also utilizing parts of Andrew Davis' SRAM heap:
|
* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
|
* Andrew F. Davis <afd@ti.com>
|
*
|
* Copyright (C) 2022 Rockchip Electronics Co. Ltd.
|
* Author: Simon Xue <xxm@rock-chips.com>
|
*/
|
|
#include <linux/cma.h>
|
#include <linux/dma-buf.h>
|
#include <linux/dma-map-ops.h>
|
#include <linux/err.h>
|
#include <linux/highmem.h>
|
#include <linux/io.h>
|
#include <linux/mm.h>
|
#include <linux/module.h>
|
#include <linux/scatterlist.h>
|
#include <linux/slab.h>
|
#include <linux/vmalloc.h>
|
#include <uapi/linux/rk-dma-heap.h>
|
#include <linux/proc_fs.h>
|
#include "../../../mm/cma.h"
|
#include "rk-dma-heap.h"
|
|
struct rk_cma_heap {
|
struct rk_dma_heap *heap;
|
struct cma *cma;
|
};
|
|
struct rk_cma_heap_buffer {
|
struct rk_cma_heap *heap;
|
struct list_head attachments;
|
struct mutex lock;
|
unsigned long len;
|
struct page *cma_pages;
|
struct page **pages;
|
pgoff_t pagecount;
|
int vmap_cnt;
|
void *vaddr;
|
phys_addr_t phys;
|
bool attached;
|
};
|
|
struct rk_cma_heap_attachment {
|
struct device *dev;
|
struct sg_table table;
|
struct list_head list;
|
bool mapped;
|
};
|
|
static int rk_cma_heap_attach(struct dma_buf *dmabuf,
|
struct dma_buf_attachment *attachment)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
struct rk_cma_heap_attachment *a;
|
struct sg_table *table;
|
size_t size = buffer->pagecount << PAGE_SHIFT;
|
int ret;
|
|
a = kzalloc(sizeof(*a), GFP_KERNEL);
|
if (!a)
|
return -ENOMEM;
|
|
table = &a->table;
|
|
ret = sg_alloc_table(table, 1, GFP_KERNEL);
|
if (ret) {
|
kfree(a);
|
return ret;
|
}
|
sg_set_page(table->sgl, buffer->cma_pages, PAGE_ALIGN(size), 0);
|
|
a->dev = attachment->dev;
|
INIT_LIST_HEAD(&a->list);
|
a->mapped = false;
|
|
attachment->priv = a;
|
|
buffer->attached = true;
|
|
mutex_lock(&buffer->lock);
|
list_add(&a->list, &buffer->attachments);
|
mutex_unlock(&buffer->lock);
|
|
return 0;
|
}
|
|
static void rk_cma_heap_detach(struct dma_buf *dmabuf,
|
struct dma_buf_attachment *attachment)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
struct rk_cma_heap_attachment *a = attachment->priv;
|
|
mutex_lock(&buffer->lock);
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list_del(&a->list);
|
mutex_unlock(&buffer->lock);
|
|
buffer->attached = false;
|
|
sg_free_table(&a->table);
|
kfree(a);
|
}
|
|
static struct sg_table *rk_cma_heap_map_dma_buf(struct dma_buf_attachment *attachment,
|
enum dma_data_direction direction)
|
{
|
struct rk_cma_heap_attachment *a = attachment->priv;
|
struct sg_table *table = &a->table;
|
int attrs = attachment->dma_map_attrs;
|
int ret;
|
|
ret = dma_map_sgtable(attachment->dev, table, direction, attrs);
|
if (ret)
|
return ERR_PTR(-ENOMEM);
|
a->mapped = true;
|
return table;
|
}
|
|
static void rk_cma_heap_unmap_dma_buf(struct dma_buf_attachment *attachment,
|
struct sg_table *table,
|
enum dma_data_direction direction)
|
{
|
struct rk_cma_heap_attachment *a = attachment->priv;
|
int attrs = attachment->dma_map_attrs;
|
|
a->mapped = false;
|
dma_unmap_sgtable(attachment->dev, table, direction, attrs);
|
}
|
|
static int
|
rk_cma_heap_dma_buf_begin_cpu_access_partial(struct dma_buf *dmabuf,
|
enum dma_data_direction direction,
|
unsigned int offset,
|
unsigned int len)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
struct rk_cma_heap_attachment *a;
|
|
if (buffer->vmap_cnt)
|
invalidate_kernel_vmap_range(buffer->vaddr, buffer->len);
|
|
mutex_lock(&buffer->lock);
|
list_for_each_entry(a, &buffer->attachments, list) {
|
if (!a->mapped)
|
continue;
|
dma_sync_sgtable_for_cpu(a->dev, &a->table, direction);
|
}
|
|
/* For userspace that not attach yet */
|
if (buffer->phys && !buffer->attached)
|
dma_sync_single_for_cpu(rk_dma_heap_get_dev(buffer->heap->heap),
|
buffer->phys + offset,
|
len,
|
direction);
|
mutex_unlock(&buffer->lock);
|
|
return 0;
|
}
|
|
static int
|
rk_cma_heap_dma_buf_end_cpu_access_partial(struct dma_buf *dmabuf,
|
enum dma_data_direction direction,
|
unsigned int offset,
|
unsigned int len)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
struct rk_cma_heap_attachment *a;
|
|
if (buffer->vmap_cnt)
|
flush_kernel_vmap_range(buffer->vaddr, buffer->len);
|
|
mutex_lock(&buffer->lock);
|
list_for_each_entry(a, &buffer->attachments, list) {
|
if (!a->mapped)
|
continue;
|
dma_sync_sgtable_for_device(a->dev, &a->table, direction);
|
}
|
|
/* For userspace that not attach yet */
|
if (buffer->phys && !buffer->attached)
|
dma_sync_single_for_device(rk_dma_heap_get_dev(buffer->heap->heap),
|
buffer->phys + offset,
|
len,
|
direction);
|
mutex_unlock(&buffer->lock);
|
|
return 0;
|
}
|
|
static int rk_cma_heap_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
|
enum dma_data_direction dir)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
unsigned int len = buffer->pagecount * PAGE_SIZE;
|
|
return rk_cma_heap_dma_buf_begin_cpu_access_partial(dmabuf, dir, 0, len);
|
}
|
|
static int rk_cma_heap_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
|
enum dma_data_direction dir)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
unsigned int len = buffer->pagecount * PAGE_SIZE;
|
|
return rk_cma_heap_dma_buf_end_cpu_access_partial(dmabuf, dir, 0, len);
|
}
|
|
static int rk_cma_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
size_t size = vma->vm_end - vma->vm_start;
|
int ret;
|
|
ret = remap_pfn_range(vma, vma->vm_start, __phys_to_pfn(buffer->phys),
|
size, vma->vm_page_prot);
|
if (ret)
|
return -EAGAIN;
|
|
return 0;
|
}
|
|
static void *rk_cma_heap_do_vmap(struct rk_cma_heap_buffer *buffer)
|
{
|
void *vaddr;
|
pgprot_t pgprot = PAGE_KERNEL;
|
|
vaddr = vmap(buffer->pages, buffer->pagecount, VM_MAP, pgprot);
|
if (!vaddr)
|
return ERR_PTR(-ENOMEM);
|
|
return vaddr;
|
}
|
|
static void *rk_cma_heap_vmap(struct dma_buf *dmabuf)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
void *vaddr;
|
|
mutex_lock(&buffer->lock);
|
if (buffer->vmap_cnt) {
|
buffer->vmap_cnt++;
|
vaddr = buffer->vaddr;
|
goto out;
|
}
|
|
vaddr = rk_cma_heap_do_vmap(buffer);
|
if (IS_ERR(vaddr))
|
goto out;
|
|
buffer->vaddr = vaddr;
|
buffer->vmap_cnt++;
|
out:
|
mutex_unlock(&buffer->lock);
|
|
return vaddr;
|
}
|
|
static void rk_cma_heap_vunmap(struct dma_buf *dmabuf, void *vaddr)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
|
mutex_lock(&buffer->lock);
|
if (!--buffer->vmap_cnt) {
|
vunmap(buffer->vaddr);
|
buffer->vaddr = NULL;
|
}
|
mutex_unlock(&buffer->lock);
|
}
|
|
static void rk_cma_heap_remove_dmabuf_list(struct dma_buf *dmabuf)
|
{
|
struct rk_dma_heap_dmabuf *buf;
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
struct rk_cma_heap *cma_heap = buffer->heap;
|
struct rk_dma_heap *heap = cma_heap->heap;
|
|
mutex_lock(&heap->dmabuf_lock);
|
list_for_each_entry(buf, &heap->dmabuf_list, node) {
|
if (buf->dmabuf == dmabuf) {
|
dma_heap_print("<%s> free dmabuf<ino-%ld>@[%pa-%pa] to heap-<%s>\n",
|
dmabuf->name,
|
dmabuf->file->f_inode->i_ino,
|
&buf->start, &buf->end,
|
rk_dma_heap_get_name(heap));
|
list_del(&buf->node);
|
kfree(buf);
|
break;
|
}
|
}
|
mutex_unlock(&heap->dmabuf_lock);
|
}
|
|
static int rk_cma_heap_add_dmabuf_list(struct dma_buf *dmabuf, const char *name)
|
{
|
struct rk_dma_heap_dmabuf *buf;
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
struct rk_cma_heap *cma_heap = buffer->heap;
|
struct rk_dma_heap *heap = cma_heap->heap;
|
|
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
|
if (!buf)
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(&buf->node);
|
buf->dmabuf = dmabuf;
|
buf->start = buffer->phys;
|
buf->end = buf->start + buffer->len - 1;
|
mutex_lock(&heap->dmabuf_lock);
|
list_add_tail(&buf->node, &heap->dmabuf_list);
|
mutex_unlock(&heap->dmabuf_lock);
|
|
dma_heap_print("<%s> alloc dmabuf<ino-%ld>@[%pa-%pa] from heap-<%s>\n",
|
dmabuf->name, dmabuf->file->f_inode->i_ino,
|
&buf->start, &buf->end, rk_dma_heap_get_name(heap));
|
|
return 0;
|
}
|
|
static int rk_cma_heap_remove_contig_list(struct rk_dma_heap *heap,
|
struct page *page, const char *name)
|
{
|
struct rk_dma_heap_contig_buf *buf;
|
|
mutex_lock(&heap->contig_lock);
|
list_for_each_entry(buf, &heap->contig_list, node) {
|
if (buf->start == page_to_phys(page)) {
|
dma_heap_print("<%s> free contig-buf@[%pa-%pa] to heap-<%s>\n",
|
buf->orig_alloc, &buf->start, &buf->end,
|
rk_dma_heap_get_name(heap));
|
list_del(&buf->node);
|
kfree(buf->orig_alloc);
|
kfree(buf);
|
break;
|
}
|
}
|
mutex_unlock(&heap->contig_lock);
|
|
return 0;
|
}
|
|
static int rk_cma_heap_add_contig_list(struct rk_dma_heap *heap,
|
struct page *page, unsigned long size,
|
const char *name)
|
{
|
struct rk_dma_heap_contig_buf *buf;
|
const char *name_tmp;
|
|
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
|
if (!buf)
|
return -ENOMEM;
|
|
INIT_LIST_HEAD(&buf->node);
|
if (!name)
|
name_tmp = current->comm;
|
else
|
name_tmp = name;
|
|
buf->orig_alloc = kstrndup(name_tmp, RK_DMA_HEAP_NAME_LEN, GFP_KERNEL);
|
if (!buf->orig_alloc) {
|
kfree(buf);
|
return -ENOMEM;
|
}
|
|
buf->start = page_to_phys(page);
|
buf->end = buf->start + size - 1;
|
mutex_lock(&heap->contig_lock);
|
list_add_tail(&buf->node, &heap->contig_list);
|
mutex_unlock(&heap->contig_lock);
|
|
dma_heap_print("<%s> alloc contig-buf@[%pa-%pa] from heap-<%s>\n",
|
buf->orig_alloc, &buf->start, &buf->end,
|
rk_dma_heap_get_name(heap));
|
|
return 0;
|
}
|
|
static void rk_cma_heap_dma_buf_release(struct dma_buf *dmabuf)
|
{
|
struct rk_cma_heap_buffer *buffer = dmabuf->priv;
|
struct rk_cma_heap *cma_heap = buffer->heap;
|
struct rk_dma_heap *heap = cma_heap->heap;
|
|
if (buffer->vmap_cnt > 0) {
|
WARN(1, "%s: buffer still mapped in the kernel\n", __func__);
|
vunmap(buffer->vaddr);
|
}
|
|
rk_cma_heap_remove_dmabuf_list(dmabuf);
|
|
/* free page list */
|
kfree(buffer->pages);
|
/* release memory */
|
cma_release(cma_heap->cma, buffer->cma_pages, buffer->pagecount);
|
rk_dma_heap_total_dec(heap, buffer->len);
|
|
kfree(buffer);
|
}
|
|
static const struct dma_buf_ops rk_cma_heap_buf_ops = {
|
.cache_sgt_mapping = true,
|
.attach = rk_cma_heap_attach,
|
.detach = rk_cma_heap_detach,
|
.map_dma_buf = rk_cma_heap_map_dma_buf,
|
.unmap_dma_buf = rk_cma_heap_unmap_dma_buf,
|
.begin_cpu_access = rk_cma_heap_dma_buf_begin_cpu_access,
|
.end_cpu_access = rk_cma_heap_dma_buf_end_cpu_access,
|
.begin_cpu_access_partial = rk_cma_heap_dma_buf_begin_cpu_access_partial,
|
.end_cpu_access_partial = rk_cma_heap_dma_buf_end_cpu_access_partial,
|
.mmap = rk_cma_heap_mmap,
|
.vmap = rk_cma_heap_vmap,
|
.vunmap = rk_cma_heap_vunmap,
|
.release = rk_cma_heap_dma_buf_release,
|
};
|
|
static struct dma_buf *rk_cma_heap_allocate(struct rk_dma_heap *heap,
|
unsigned long len,
|
unsigned long fd_flags,
|
unsigned long heap_flags,
|
const char *name)
|
{
|
struct rk_cma_heap *cma_heap = rk_dma_heap_get_drvdata(heap);
|
struct rk_cma_heap_buffer *buffer;
|
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
|
size_t size = PAGE_ALIGN(len);
|
pgoff_t pagecount = size >> PAGE_SHIFT;
|
unsigned long align = get_order(size);
|
struct page *cma_pages;
|
struct dma_buf *dmabuf;
|
pgoff_t pg;
|
int ret = -ENOMEM;
|
|
buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
|
if (!buffer)
|
return ERR_PTR(-ENOMEM);
|
|
INIT_LIST_HEAD(&buffer->attachments);
|
mutex_init(&buffer->lock);
|
buffer->len = size;
|
|
if (align > CONFIG_DMABUF_HEAPS_ROCKCHIP_CMA_ALIGNMENT)
|
align = CONFIG_DMABUF_HEAPS_ROCKCHIP_CMA_ALIGNMENT;
|
|
cma_pages = cma_alloc(cma_heap->cma, pagecount, align, GFP_KERNEL);
|
if (!cma_pages)
|
goto free_buffer;
|
|
/* Clear the cma pages */
|
if (PageHighMem(cma_pages)) {
|
unsigned long nr_clear_pages = pagecount;
|
struct page *page = cma_pages;
|
|
while (nr_clear_pages > 0) {
|
void *vaddr = kmap_atomic(page);
|
|
memset(vaddr, 0, PAGE_SIZE);
|
kunmap_atomic(vaddr);
|
/*
|
* Avoid wasting time zeroing memory if the process
|
* has been killed by SIGKILL
|
*/
|
if (fatal_signal_pending(current))
|
goto free_cma;
|
page++;
|
nr_clear_pages--;
|
}
|
} else {
|
memset(page_address(cma_pages), 0, size);
|
}
|
|
buffer->pages = kmalloc_array(pagecount, sizeof(*buffer->pages),
|
GFP_KERNEL);
|
if (!buffer->pages) {
|
ret = -ENOMEM;
|
goto free_cma;
|
}
|
|
for (pg = 0; pg < pagecount; pg++)
|
buffer->pages[pg] = &cma_pages[pg];
|
|
buffer->cma_pages = cma_pages;
|
buffer->heap = cma_heap;
|
buffer->pagecount = pagecount;
|
|
/* create the dmabuf */
|
exp_info.exp_name = rk_dma_heap_get_name(heap);
|
exp_info.ops = &rk_cma_heap_buf_ops;
|
exp_info.size = buffer->len;
|
exp_info.flags = fd_flags;
|
exp_info.priv = buffer;
|
dmabuf = dma_buf_export(&exp_info);
|
if (IS_ERR(dmabuf)) {
|
ret = PTR_ERR(dmabuf);
|
goto free_pages;
|
}
|
|
buffer->phys = page_to_phys(cma_pages);
|
dma_sync_single_for_cpu(rk_dma_heap_get_dev(heap), buffer->phys,
|
buffer->pagecount * PAGE_SIZE,
|
DMA_FROM_DEVICE);
|
|
ret = rk_cma_heap_add_dmabuf_list(dmabuf, name);
|
if (ret)
|
goto fail_dma_buf;
|
|
rk_dma_heap_total_inc(heap, buffer->len);
|
|
return dmabuf;
|
|
fail_dma_buf:
|
dma_buf_put(dmabuf);
|
free_pages:
|
kfree(buffer->pages);
|
free_cma:
|
cma_release(cma_heap->cma, cma_pages, pagecount);
|
free_buffer:
|
kfree(buffer);
|
|
return ERR_PTR(ret);
|
}
|
|
static struct page *rk_cma_heap_allocate_pages(struct rk_dma_heap *heap,
|
size_t len, const char *name)
|
{
|
struct rk_cma_heap *cma_heap = rk_dma_heap_get_drvdata(heap);
|
size_t size = PAGE_ALIGN(len);
|
pgoff_t pagecount = size >> PAGE_SHIFT;
|
unsigned long align = get_order(size);
|
struct page *page;
|
int ret;
|
|
if (align > CONFIG_DMABUF_HEAPS_ROCKCHIP_CMA_ALIGNMENT)
|
align = CONFIG_DMABUF_HEAPS_ROCKCHIP_CMA_ALIGNMENT;
|
|
page = cma_alloc(cma_heap->cma, pagecount, align, GFP_KERNEL);
|
if (!page)
|
return ERR_PTR(-ENOMEM);
|
|
ret = rk_cma_heap_add_contig_list(heap, page, size, name);
|
if (ret) {
|
cma_release(cma_heap->cma, page, pagecount);
|
return ERR_PTR(-EINVAL);
|
}
|
|
rk_dma_heap_total_inc(heap, size);
|
|
return page;
|
}
|
|
static void rk_cma_heap_free_pages(struct rk_dma_heap *heap,
|
struct page *page, size_t len,
|
const char *name)
|
{
|
struct rk_cma_heap *cma_heap = rk_dma_heap_get_drvdata(heap);
|
pgoff_t pagecount = len >> PAGE_SHIFT;
|
|
rk_cma_heap_remove_contig_list(heap, page, name);
|
|
cma_release(cma_heap->cma, page, pagecount);
|
|
rk_dma_heap_total_dec(heap, len);
|
}
|
|
static const struct rk_dma_heap_ops rk_cma_heap_ops = {
|
.allocate = rk_cma_heap_allocate,
|
.alloc_contig_pages = rk_cma_heap_allocate_pages,
|
.free_contig_pages = rk_cma_heap_free_pages,
|
};
|
|
static int cma_procfs_show(struct seq_file *s, void *private);
|
|
static int __rk_add_cma_heap(struct cma *cma, void *data)
|
{
|
struct rk_cma_heap *cma_heap;
|
struct rk_dma_heap_export_info exp_info;
|
|
cma_heap = kzalloc(sizeof(*cma_heap), GFP_KERNEL);
|
if (!cma_heap)
|
return -ENOMEM;
|
cma_heap->cma = cma;
|
|
exp_info.name = cma_get_name(cma);
|
exp_info.ops = &rk_cma_heap_ops;
|
exp_info.priv = cma_heap;
|
exp_info.support_cma = true;
|
|
cma_heap->heap = rk_dma_heap_add(&exp_info);
|
if (IS_ERR(cma_heap->heap)) {
|
int ret = PTR_ERR(cma_heap->heap);
|
|
kfree(cma_heap);
|
return ret;
|
}
|
|
if (cma_heap->heap->procfs)
|
proc_create_single_data("alloc_bitmap", 0, cma_heap->heap->procfs,
|
cma_procfs_show, cma);
|
|
return 0;
|
}
|
|
static int __init rk_add_default_cma_heap(void)
|
{
|
struct cma *cma = rk_dma_heap_get_cma();
|
|
if (WARN_ON(!cma))
|
return -EINVAL;
|
|
return __rk_add_cma_heap(cma, NULL);
|
}
|
|
#if defined(CONFIG_VIDEO_ROCKCHIP_THUNDER_BOOT_ISP) && !defined(CONFIG_INITCALL_ASYNC)
|
subsys_initcall(rk_add_default_cma_heap);
|
#else
|
module_init(rk_add_default_cma_heap);
|
#endif
|
|
static void cma_procfs_format_array(char *buf, size_t bufsize, u32 *array, int array_size)
|
{
|
int i = 0;
|
|
while (--array_size >= 0) {
|
size_t len;
|
char term = (array_size && (++i % 8)) ? ' ' : '\n';
|
|
len = snprintf(buf, bufsize, "%08X%c", *array++, term);
|
buf += len;
|
bufsize -= len;
|
}
|
}
|
|
static void cma_procfs_show_bitmap(struct seq_file *s, struct cma *cma)
|
{
|
int elements = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));
|
int size = elements * 9;
|
u32 *array = (u32 *)cma->bitmap;
|
char *buf;
|
|
buf = kmalloc(size + 1, GFP_KERNEL);
|
if (!buf)
|
return;
|
|
buf[size] = 0;
|
|
cma_procfs_format_array(buf, size + 1, array, elements);
|
seq_printf(s, "%s", buf);
|
kfree(buf);
|
}
|
|
static u64 cma_procfs_used_get(struct cma *cma)
|
{
|
unsigned long used;
|
|
mutex_lock(&cma->lock);
|
used = bitmap_weight(cma->bitmap, (int)cma_bitmap_maxno(cma));
|
mutex_unlock(&cma->lock);
|
|
return (u64)used << cma->order_per_bit;
|
}
|
|
static int cma_procfs_show(struct seq_file *s, void *private)
|
{
|
struct cma *cma = s->private;
|
u64 used = cma_procfs_used_get(cma);
|
|
seq_printf(s, "Total: %lu KiB\n", cma->count << (PAGE_SHIFT - 10));
|
seq_printf(s, " Used: %llu KiB\n\n", used << (PAGE_SHIFT - 10));
|
|
cma_procfs_show_bitmap(s, cma);
|
|
return 0;
|
}
|
|
MODULE_DESCRIPTION("RockChip DMA-BUF CMA Heap");
|
MODULE_LICENSE("GPL v2");
|
