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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127// 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; if (copy_to_iter_fromio((const void __iomem *)src, count, &iter) != count) return -EFAULT; return 0;}EXPORT_SYMBOL(copy_to_user_fromio);
/** * copy_to_iter_fromio - copy data from mmio-space to iov_iter * @src: the source pointer on mmio * @count: the data size to copy in bytes * @dst: the destination iov_iter * * Copies the data from mmio-space to iov_iter. * * Return: number of bytes to be copied */size_t copy_to_iter_fromio(const void __iomem *src, size_t count, struct iov_iter *dst){#if defined(__i386__) || defined(CONFIG_SPARC32) return copy_to_iter((const void __force *)src, count, dst);#else char buf[256]; size_t res = 0;
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 res; count -= c; src += c; res += c; } return res;#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; if (copy_from_iter_toio((void __iomem *)dst, count, &iter) != count) return -EFAULT; return 0;}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 * @count: the data size to copy in bytes * @src: the source iov_iter * * Copies the data from iov_iter to mmio-space. * * Return: number of bytes to be copied */size_t copy_from_iter_toio(void __iomem *dst, size_t count, struct iov_iter *src){#if defined(__i386__) || defined(CONFIG_SPARC32) return copy_from_iter((void __force *)dst, count, src);#else char buf[256]; size_t res = 0;
while (count) { size_t c = count; if (c > sizeof(buf)) c = sizeof(buf); if (copy_from_iter(buf, c, src) != c) return res; memcpy_toio(dst, buf, c); count -= c; dst += c; res += c; } return res;#endif}EXPORT_SYMBOL(copy_from_iter_toio);