The patch titled
Subject: zram: add 842 compression backend support
has been added to the -mm mm-unstable branch. Its filename is
zram-add-842-compression-backend-support.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-add-842-compression-backend-support.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Subject: zram: add 842 compression backend support
Date: Fri, 12 Jul 2024 14:18:22 +0900
Add s/w 842 compression support.
Link: https://lkml.kernel.org/r/20240712051850.484318-12-senozhatsky@xxxxxxxxxxxx
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Nick Terrell <terrelln@xxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/Kconfig | 11 ++++
drivers/block/zram/Makefile | 1
drivers/block/zram/backend_842.c | 68 +++++++++++++++++++++++++++++
drivers/block/zram/backend_842.h | 10 ++++
drivers/block/zram/zcomp.c | 4 +
5 files changed, 94 insertions(+)
--- /dev/null
+++ a/drivers/block/zram/backend_842.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sw842.h>
+#include <linux/vmalloc.h>
+
+#include "backend_842.h"
+
+struct sw842_ctx {
+ void *mem;
+};
+
+static void destroy_842(void *ctx)
+{
+ struct sw842_ctx *zctx = ctx;
+
+ kfree(zctx->mem);
+ kfree(zctx);
+}
+
+static void *create_842(void)
+{
+ struct sw842_ctx *ctx;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return NULL;
+
+ ctx->mem = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
+ if (!ctx->mem)
+ goto error;
+
+ return ctx;
+
+error:
+ destroy_842(ctx);
+ return NULL;
+}
+
+static int compress_842(void *ctx, const unsigned char *src, size_t src_len,
+ unsigned char *dst, size_t *dst_len)
+{
+ struct sw842_ctx *zctx = ctx;
+ unsigned int dlen = *dst_len;
+ int ret;
+
+ ret = sw842_compress(src, src_len, dst, &dlen, zctx->mem);
+ if (ret == 0)
+ *dst_len = dlen;
+ return ret;
+}
+
+static int decompress_842(void *ctx, const unsigned char *src, size_t src_len,
+ unsigned char *dst, size_t dst_len)
+{
+ unsigned int dlen = dst_len;
+
+ return sw842_decompress(src, src_len, dst, &dlen);
+}
+
+const struct zcomp_ops backend_842 = {
+ .compress = compress_842,
+ .decompress = decompress_842,
+ .create_ctx = create_842,
+ .destroy_ctx = destroy_842,
+ .name = "842",
+};
--- /dev/null
+++ a/drivers/block/zram/backend_842.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef __BACKEND_842_H__
+#define __BACKEND_842_H__
+
+#include "zcomp.h"
+
+extern const struct zcomp_ops backend_842;
+
+#endif /* __BACKEND_842_H__ */
--- a/drivers/block/zram/Kconfig~zram-add-842-compression-backend-support
+++ a/drivers/block/zram/Kconfig
@@ -45,6 +45,12 @@ config ZRAM_BACKEND_DEFLATE
select ZLIB_DEFLATE
select ZLIB_INFLATE
+config ZRAM_BACKEND_842
+ bool "842 compression support"
+ depends on ZRAM
+ select 842_COMPRESS
+ select 842_DECOMPRESS
+
choice
prompt "Default zram compressor"
default ZRAM_DEF_COMP_LZORLE
@@ -74,6 +80,10 @@ config ZRAM_DEF_COMP_DEFLATE
bool "deflate"
depends on ZRAM_BACKEND_DEFLATE
+config ZRAM_DEF_COMP_842
+ bool "842"
+ depends on ZRAM_BACKEND_842
+
endchoice
config ZRAM_DEF_COMP
@@ -84,6 +94,7 @@ config ZRAM_DEF_COMP
default "lz4hc" if ZRAM_DEF_COMP_LZ4HC
default "zstd" if ZRAM_DEF_COMP_ZSTD
default "deflate" if ZRAM_DEF_COMP_DEFLATE
+ default "842" if ZRAM_DEF_COMP_842
default "unset-value"
config ZRAM_WRITEBACK
--- a/drivers/block/zram/Makefile~zram-add-842-compression-backend-support
+++ a/drivers/block/zram/Makefile
@@ -7,5 +7,6 @@ zram-$(CONFIG_ZRAM_BACKEND_LZ4) += back
zram-$(CONFIG_ZRAM_BACKEND_LZ4HC) += backend_lz4hc.o
zram-$(CONFIG_ZRAM_BACKEND_ZSTD) += backend_zstd.o
zram-$(CONFIG_ZRAM_BACKEND_DEFLATE) += backend_deflate.o
+zram-$(CONFIG_ZRAM_BACKEND_842) += backend_842.o
obj-$(CONFIG_ZRAM) += zram.o
--- a/drivers/block/zram/zcomp.c~zram-add-842-compression-backend-support
+++ a/drivers/block/zram/zcomp.c
@@ -18,6 +18,7 @@
#include "backend_lz4hc.h"
#include "backend_zstd.h"
#include "backend_deflate.h"
+#include "backend_842.h"
static const struct zcomp_ops *backends[] = {
#if IS_ENABLED(CONFIG_ZRAM_BACKEND_LZO)
@@ -36,6 +37,9 @@ static const struct zcomp_ops *backends[
#if IS_ENABLED(CONFIG_ZRAM_BACKEND_DEFLATE)
&backend_deflate,
#endif
+#if IS_ENABLED(CONFIG_ZRAM_BACKEND_842)
+ &backend_842,
+#endif
NULL
};
_
Patches currently in -mm which might be from senozhatsky@xxxxxxxxxxxx are
lib-zstd-export-api-needed-for-dictionary-support.patch
lib-lz4hc-export-lz4_resetstreamhc-symbol.patch
lib-zstd-fix-null-deref-in-zstd_createcdict_advanced2.patch
zram-introduce-custom-comp-backends-api.patch
zram-add-lzo-and-lzorle-compression-backends-support.patch
zram-add-lz4-compression-backend-support.patch
zram-add-lz4hc-compression-backend-support.patch
zram-add-zstd-compression-backend-support.patch
zram-pass-estimated-src-size-hint-to-zstd.patch
zram-add-zlib-compression-backend-support.patch
zram-add-842-compression-backend-support.patch
zram-check-that-backends-array-has-at-least-one-backend.patch
zram-introduce-zcomp_params-structure.patch
zram-recalculate-zstd-compression-params-once.patch
zram-extend-comp_algorithm-attr-write-handling.patch
zram-add-support-for-dict-comp-config.patch
zram-introduce-zcomp_req-structure.patch
zram-introduce-zcomp_ctx-structure.patch
zram-move-immutable-comp-params-away-from-per-cpu-context.patch
zram-add-dictionary-support-to-lz4.patch
zram-add-dictionary-support-to-lz4hc.patch
zram-add-dictionary-support-to-zstd-backend.patch
documentation-zram-add-documentation-for-algorithm-parameters.patch
