mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2024-12-28 16:53:49 +00:00
561b4fa9c1
Add two more helpers for copying memory between iov_iter and iomem, which will be used by the new PCM copy ops in a few drivers. The existing helpers became wrappers of those now. Note that copy_from/to_iter() returns the copied bytes, hence the error condition is adjusted accordingly. Link: https://lore.kernel.org/r/20230815190136.8987-4-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
|
|
*
|
|
* Misc memory accessors
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/io.h>
|
|
#include <linux/uaccess.h>
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
|
|
/**
|
|
* copy_to_user_fromio - copy data from mmio-space to user-space
|
|
* @dst: the destination pointer on user-space
|
|
* @src: the source pointer on mmio
|
|
* @count: the data size to copy in bytes
|
|
*
|
|
* Copies the data from mmio-space to user-space.
|
|
*
|
|
* Return: Zero if successful, or non-zero on failure.
|
|
*/
|
|
int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
|
|
{
|
|
struct iov_iter iter;
|
|
|
|
if (import_ubuf(ITER_DEST, dst, count, &iter))
|
|
return -EFAULT;
|
|
return copy_to_iter_fromio(&iter, (const void __iomem *)src, count);
|
|
}
|
|
EXPORT_SYMBOL(copy_to_user_fromio);
|
|
|
|
/**
|
|
* copy_to_iter_fromio - copy data from mmio-space to iov_iter
|
|
* @dst: the destination iov_iter
|
|
* @src: the source pointer on mmio
|
|
* @count: the data size to copy in bytes
|
|
*
|
|
* Copies the data from mmio-space to iov_iter.
|
|
*
|
|
* Return: Zero if successful, or non-zero on failure.
|
|
*/
|
|
int copy_to_iter_fromio(struct iov_iter *dst, const void __iomem *src,
|
|
size_t count)
|
|
{
|
|
#if defined(__i386__) || defined(CONFIG_SPARC32)
|
|
return copy_to_iter((const void __force *)src, count, dst) == count ? 0 : -EFAULT;
|
|
#else
|
|
char buf[256];
|
|
while (count) {
|
|
size_t c = count;
|
|
if (c > sizeof(buf))
|
|
c = sizeof(buf);
|
|
memcpy_fromio(buf, (void __iomem *)src, c);
|
|
if (copy_to_iter(buf, c, dst) != c)
|
|
return -EFAULT;
|
|
count -= c;
|
|
src += c;
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(copy_to_iter_fromio);
|
|
|
|
/**
|
|
* copy_from_user_toio - copy data from user-space to mmio-space
|
|
* @dst: the destination pointer on mmio-space
|
|
* @src: the source pointer on user-space
|
|
* @count: the data size to copy in bytes
|
|
*
|
|
* Copies the data from user-space to mmio-space.
|
|
*
|
|
* Return: Zero if successful, or non-zero on failure.
|
|
*/
|
|
int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
|
|
{
|
|
struct iov_iter iter;
|
|
|
|
if (import_ubuf(ITER_SOURCE, (void __user *)src, count, &iter))
|
|
return -EFAULT;
|
|
return copy_from_iter_toio((void __iomem *)dst, &iter, count);
|
|
}
|
|
EXPORT_SYMBOL(copy_from_user_toio);
|
|
|
|
/**
|
|
* copy_from_iter_toio - copy data from iov_iter to mmio-space
|
|
* @dst: the destination pointer on mmio-space
|
|
* @src: the source iov_iter
|
|
* @count: the data size to copy in bytes
|
|
*
|
|
* Copies the data from iov_iter to mmio-space.
|
|
*
|
|
* Return: Zero if successful, or non-zero on failure.
|
|
*/
|
|
int copy_from_iter_toio(void __iomem *dst, struct iov_iter *src, size_t count)
|
|
{
|
|
#if defined(__i386__) || defined(CONFIG_SPARC32)
|
|
return copy_from_iter((void __force *)dst, count, src) == count ? 0 : -EFAULT;
|
|
#else
|
|
char buf[256];
|
|
while (count) {
|
|
size_t c = count;
|
|
if (c > sizeof(buf))
|
|
c = sizeof(buf);
|
|
if (copy_from_iter(buf, c, src) != c)
|
|
return -EFAULT;
|
|
memcpy_toio(dst, buf, c);
|
|
count -= c;
|
|
dst += c;
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(copy_from_iter_toio);
|