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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /sound/core/memory.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/core/memory.c')
-rw-r--r-- | sound/core/memory.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/sound/core/memory.c b/sound/core/memory.c new file mode 100644 index 0000000000..2d2d0094c8 --- /dev/null +++ b/sound/core/memory.c @@ -0,0 +1,115 @@ +// 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); |