mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 22:36:40 +07:00
121b3ddbe4
The function vb2_dma_contig_vaddr returns a void * not an integer. Quiets the sparse noise: warning: Using plain integer as NULL pointer Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Cc: Pawel Osciak <pawel@osciak.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Mauro Carvalho Chehab <mchehab@infradead.org> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
187 lines
3.9 KiB
C
187 lines
3.9 KiB
C
/*
|
|
* videobuf2-dma-contig.c - DMA contig memory allocator for videobuf2
|
|
*
|
|
* Copyright (C) 2010 Samsung Electronics
|
|
*
|
|
* Author: Pawel Osciak <pawel@osciak.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#include <media/videobuf2-core.h>
|
|
#include <media/videobuf2-dma-contig.h>
|
|
#include <media/videobuf2-memops.h>
|
|
|
|
struct vb2_dc_conf {
|
|
struct device *dev;
|
|
};
|
|
|
|
struct vb2_dc_buf {
|
|
struct vb2_dc_conf *conf;
|
|
void *vaddr;
|
|
dma_addr_t dma_addr;
|
|
unsigned long size;
|
|
struct vm_area_struct *vma;
|
|
atomic_t refcount;
|
|
struct vb2_vmarea_handler handler;
|
|
};
|
|
|
|
static void vb2_dma_contig_put(void *buf_priv);
|
|
|
|
static void *vb2_dma_contig_alloc(void *alloc_ctx, unsigned long size)
|
|
{
|
|
struct vb2_dc_conf *conf = alloc_ctx;
|
|
struct vb2_dc_buf *buf;
|
|
|
|
buf = kzalloc(sizeof *buf, GFP_KERNEL);
|
|
if (!buf)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
buf->vaddr = dma_alloc_coherent(conf->dev, size, &buf->dma_addr,
|
|
GFP_KERNEL);
|
|
if (!buf->vaddr) {
|
|
dev_err(conf->dev, "dma_alloc_coherent of size %ld failed\n",
|
|
size);
|
|
kfree(buf);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
buf->conf = conf;
|
|
buf->size = size;
|
|
|
|
buf->handler.refcount = &buf->refcount;
|
|
buf->handler.put = vb2_dma_contig_put;
|
|
buf->handler.arg = buf;
|
|
|
|
atomic_inc(&buf->refcount);
|
|
|
|
return buf;
|
|
}
|
|
|
|
static void vb2_dma_contig_put(void *buf_priv)
|
|
{
|
|
struct vb2_dc_buf *buf = buf_priv;
|
|
|
|
if (atomic_dec_and_test(&buf->refcount)) {
|
|
dma_free_coherent(buf->conf->dev, buf->size, buf->vaddr,
|
|
buf->dma_addr);
|
|
kfree(buf);
|
|
}
|
|
}
|
|
|
|
static void *vb2_dma_contig_cookie(void *buf_priv)
|
|
{
|
|
struct vb2_dc_buf *buf = buf_priv;
|
|
|
|
return &buf->dma_addr;
|
|
}
|
|
|
|
static void *vb2_dma_contig_vaddr(void *buf_priv)
|
|
{
|
|
struct vb2_dc_buf *buf = buf_priv;
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
return buf->vaddr;
|
|
}
|
|
|
|
static unsigned int vb2_dma_contig_num_users(void *buf_priv)
|
|
{
|
|
struct vb2_dc_buf *buf = buf_priv;
|
|
|
|
return atomic_read(&buf->refcount);
|
|
}
|
|
|
|
static int vb2_dma_contig_mmap(void *buf_priv, struct vm_area_struct *vma)
|
|
{
|
|
struct vb2_dc_buf *buf = buf_priv;
|
|
|
|
if (!buf) {
|
|
printk(KERN_ERR "No buffer to map\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return vb2_mmap_pfn_range(vma, buf->dma_addr, buf->size,
|
|
&vb2_common_vm_ops, &buf->handler);
|
|
}
|
|
|
|
static void *vb2_dma_contig_get_userptr(void *alloc_ctx, unsigned long vaddr,
|
|
unsigned long size, int write)
|
|
{
|
|
struct vb2_dc_buf *buf;
|
|
struct vm_area_struct *vma;
|
|
dma_addr_t dma_addr = 0;
|
|
int ret;
|
|
|
|
buf = kzalloc(sizeof *buf, GFP_KERNEL);
|
|
if (!buf)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = vb2_get_contig_userptr(vaddr, size, &vma, &dma_addr);
|
|
if (ret) {
|
|
printk(KERN_ERR "Failed acquiring VMA for vaddr 0x%08lx\n",
|
|
vaddr);
|
|
kfree(buf);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
buf->size = size;
|
|
buf->dma_addr = dma_addr;
|
|
buf->vma = vma;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static void vb2_dma_contig_put_userptr(void *mem_priv)
|
|
{
|
|
struct vb2_dc_buf *buf = mem_priv;
|
|
|
|
if (!buf)
|
|
return;
|
|
|
|
vb2_put_vma(buf->vma);
|
|
kfree(buf);
|
|
}
|
|
|
|
const struct vb2_mem_ops vb2_dma_contig_memops = {
|
|
.alloc = vb2_dma_contig_alloc,
|
|
.put = vb2_dma_contig_put,
|
|
.cookie = vb2_dma_contig_cookie,
|
|
.vaddr = vb2_dma_contig_vaddr,
|
|
.mmap = vb2_dma_contig_mmap,
|
|
.get_userptr = vb2_dma_contig_get_userptr,
|
|
.put_userptr = vb2_dma_contig_put_userptr,
|
|
.num_users = vb2_dma_contig_num_users,
|
|
};
|
|
EXPORT_SYMBOL_GPL(vb2_dma_contig_memops);
|
|
|
|
void *vb2_dma_contig_init_ctx(struct device *dev)
|
|
{
|
|
struct vb2_dc_conf *conf;
|
|
|
|
conf = kzalloc(sizeof *conf, GFP_KERNEL);
|
|
if (!conf)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
conf->dev = dev;
|
|
|
|
return conf;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx);
|
|
|
|
void vb2_dma_contig_cleanup_ctx(void *alloc_ctx)
|
|
{
|
|
kfree(alloc_ctx);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_dma_contig_cleanup_ctx);
|
|
|
|
MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2");
|
|
MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>");
|
|
MODULE_LICENSE("GPL");
|