Add s/w zstd compression.
Signed-off-by: Sergey Senozhatsky <[email protected]>
---
drivers/block/zram/Kconfig | 11 ++++
drivers/block/zram/Makefile | 1 +
drivers/block/zram/backend_zstd.c | 97 +++++++++++++++++++++++++++++++
drivers/block/zram/backend_zstd.h | 10 ++++
drivers/block/zram/zcomp.c | 4 ++
5 files changed, 123 insertions(+)
create mode 100644 drivers/block/zram/backend_zstd.c
create mode 100644 drivers/block/zram/backend_zstd.h
diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig
index 0d890a8d2dc4..71cd0d5d8f35 100644
--- a/drivers/block/zram/Kconfig
+++ b/drivers/block/zram/Kconfig
@@ -32,6 +32,12 @@ config ZRAM_BACKEND_LZ4HC
select LZ4HC_COMPRESS
select LZ4_DECOMPRESS
+config ZRAM_BACKEND_ZSTD
+ bool "zstd compression support"
+ depends on ZRAM
+ select ZSTD_COMPRESS
+ select ZSTD_DECOMPRESS
+
choice
prompt "Default zram compressor"
default ZRAM_DEF_COMP_LZORLE
@@ -53,6 +59,10 @@ config ZRAM_DEF_COMP_LZ4HC
bool "lz4hc"
depends on ZRAM_BACKEND_LZ4HC
+config ZRAM_DEF_COMP_ZSTD
+ bool "zstd"
+ depends on ZRAM_BACKEND_ZSTD
+
endchoice
config ZRAM_DEF_COMP
@@ -61,6 +71,7 @@ config ZRAM_DEF_COMP
default "lzo" if ZRAM_DEF_COMP_LZO
default "lz4" if ZRAM_DEF_COMP_LZ4
default "lz4hc" if ZRAM_DEF_COMP_LZ4HC
+ default "zstd" if ZRAM_DEF_COMP_ZSTD
default "unset-value"
config ZRAM_WRITEBACK
diff --git a/drivers/block/zram/Makefile b/drivers/block/zram/Makefile
index 727c9d68e3e3..a2ca227e199c 100644
--- a/drivers/block/zram/Makefile
+++ b/drivers/block/zram/Makefile
@@ -5,5 +5,6 @@ zram-y := zcomp.o zram_drv.o
zram-$(CONFIG_ZRAM_BACKEND_LZO) += backend_lzorle.o backend_lzo.o
zram-$(CONFIG_ZRAM_BACKEND_LZ4) += backend_lz4.o
zram-$(CONFIG_ZRAM_BACKEND_LZ4HC) += backend_lz4hc.o
+zram-$(CONFIG_ZRAM_BACKEND_ZSTD) += backend_zstd.o
obj-$(CONFIG_ZRAM) += zram.o
diff --git a/drivers/block/zram/backend_zstd.c b/drivers/block/zram/backend_zstd.c
new file mode 100644
index 000000000000..bfe836844232
--- /dev/null
+++ b/drivers/block/zram/backend_zstd.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/zstd.h>
+
+#include "backend_zstd.h"
+
+struct zstd_ctx {
+ zstd_cctx *cctx;
+ zstd_dctx *dctx;
+ void *cctx_mem;
+ void *dctx_mem;
+ s32 level;
+};
+
+static void zstd_destroy(void *ctx)
+{
+ struct zstd_ctx *zctx = ctx;
+
+ vfree(zctx->cctx_mem);
+ vfree(zctx->dctx_mem);
+ kfree(zctx);
+}
+
+static void *zstd_create(void)
+{
+ zstd_parameters params;
+ struct zstd_ctx *ctx;
+ size_t sz;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return NULL;
+
+ ctx->level = zstd_default_clevel();
+ params = zstd_get_params(ctx->level, 0);
+ sz = zstd_cctx_workspace_bound(¶ms.cParams);
+ ctx->cctx_mem = vzalloc(sz);
+ if (!ctx->cctx_mem)
+ goto error;
+
+ ctx->cctx = zstd_init_cctx(ctx->cctx_mem, sz);
+ if (!ctx->cctx)
+ goto error;
+
+ sz = zstd_dctx_workspace_bound();
+ ctx->dctx_mem = vzalloc(sz);
+ if (!ctx->dctx_mem)
+ goto error;
+
+ ctx->dctx = zstd_init_dctx(ctx->dctx_mem, sz);
+ if (!ctx->dctx)
+ goto error;
+
+ return ctx;
+
+error:
+ zstd_destroy(ctx);
+ return NULL;
+}
+
+static int zstd_compress(void *ctx, const unsigned char *src,
+ unsigned char *dst, size_t *dst_len)
+{
+ struct zstd_ctx *zctx = ctx;
+ const zstd_parameters params = zstd_get_params(zctx->level, 0);
+ size_t ret;
+
+ ret = zstd_compress_cctx(zctx->cctx, dst, *dst_len,
+ src, PAGE_SIZE, ¶ms);
+ if (zstd_is_error(ret))
+ return -EINVAL;
+ *dst_len = ret;
+ return 0;
+}
+
+static int zstd_decompress(void *ctx, const unsigned char *src, size_t src_len,
+ unsigned char *dst)
+{
+ struct zstd_ctx *zctx = ctx;
+ size_t ret;
+
+ ret = zstd_decompress_dctx(zctx->dctx, dst, PAGE_SIZE, src, src_len);
+ if (zstd_is_error(ret))
+ return -EINVAL;
+ return 0;
+}
+
+struct zcomp_backend backend_zstd = {
+ .compress = zstd_compress,
+ .decompress = zstd_decompress,
+ .create_ctx = zstd_create,
+ .destroy_ctx = zstd_destroy,
+ .name = "zstd",
+};
diff --git a/drivers/block/zram/backend_zstd.h b/drivers/block/zram/backend_zstd.h
new file mode 100644
index 000000000000..75d2d2c02768
--- /dev/null
+++ b/drivers/block/zram/backend_zstd.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef __BACKEND_ZSTD_H__
+#define __BACKEND_ZSTD_H__
+
+#include "zcomp.h"
+
+extern struct zcomp_backend backend_zstd;
+
+#endif /* __BACKEND_ZSTD_H__ */
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index f04f5844a23c..c16eb038f608 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -19,6 +19,7 @@
#include "backend_lzorle.h"
#include "backend_lz4.h"
#include "backend_lz4hc.h"
+#include "backend_zstd.h"
static struct zcomp_backend *backends[] = {
#if IS_ENABLED(CONFIG_ZRAM_BACKEND_LZO)
@@ -30,6 +31,9 @@ static struct zcomp_backend *backends[] = {
#endif
#if IS_ENABLED(CONFIG_ZRAM_BACKEND_LZ4HC)
&backend_lz4hc,
+#endif
+#if IS_ENABLED(CONFIG_ZRAM_BACKEND_ZSTD)
+ &backend_zstd,
#endif
NULL
};
--
2.45.0.rc1.225.g2a3ae87e7f-goog