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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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b8f03cb703
Immutable params never change once comp has been allocated and setup, so we don't need to store multiple copies of them in each per-CPU backend context. Move those to per-comp zcomp_params and pass it to backends callbacks for requests execution. Basically, this means parameters sharing between different contexts. Also introduce two new backends callbacks: setup_params() and release_params(). First, we need to validate params in a driver-specific way; second, driver may want to allocate its specific representation of the params which is needed to execute requests. Link: https://lkml.kernel.org/r/20240902105656.1383858-20-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Nick Terrell <terrelln@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/zlib.h>
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#include "backend_deflate.h"
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/* Use the same value as crypto API */
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#define DEFLATE_DEF_WINBITS 11
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#define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL
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struct deflate_ctx {
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struct z_stream_s cctx;
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struct z_stream_s dctx;
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};
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static void deflate_release_params(struct zcomp_params *params)
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{
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}
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static int deflate_setup_params(struct zcomp_params *params)
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{
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if (params->level == ZCOMP_PARAM_NO_LEVEL)
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params->level = Z_DEFAULT_COMPRESSION;
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return 0;
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}
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static void deflate_destroy(struct zcomp_ctx *ctx)
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{
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struct deflate_ctx *zctx = ctx->context;
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if (!zctx)
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return;
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if (zctx->cctx.workspace) {
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zlib_deflateEnd(&zctx->cctx);
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vfree(zctx->cctx.workspace);
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}
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if (zctx->dctx.workspace) {
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zlib_inflateEnd(&zctx->dctx);
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vfree(zctx->dctx.workspace);
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}
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kfree(zctx);
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}
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static int deflate_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
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{
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struct deflate_ctx *zctx;
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size_t sz;
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int ret;
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zctx = kzalloc(sizeof(*zctx), GFP_KERNEL);
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if (!zctx)
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return -ENOMEM;
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ctx->context = zctx;
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sz = zlib_deflate_workspacesize(-DEFLATE_DEF_WINBITS, MAX_MEM_LEVEL);
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zctx->cctx.workspace = vzalloc(sz);
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if (!zctx->cctx.workspace)
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goto error;
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ret = zlib_deflateInit2(&zctx->cctx, params->level, Z_DEFLATED,
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-DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
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Z_DEFAULT_STRATEGY);
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if (ret != Z_OK)
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goto error;
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sz = zlib_inflate_workspacesize();
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zctx->dctx.workspace = vzalloc(sz);
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if (!zctx->dctx.workspace)
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goto error;
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ret = zlib_inflateInit2(&zctx->dctx, -DEFLATE_DEF_WINBITS);
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if (ret != Z_OK)
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goto error;
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return 0;
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error:
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deflate_destroy(ctx);
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return -EINVAL;
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}
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static int deflate_compress(struct zcomp_params *params, struct zcomp_ctx *ctx,
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struct zcomp_req *req)
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{
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struct deflate_ctx *zctx = ctx->context;
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struct z_stream_s *deflate;
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int ret;
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deflate = &zctx->cctx;
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ret = zlib_deflateReset(deflate);
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if (ret != Z_OK)
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return -EINVAL;
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deflate->next_in = (u8 *)req->src;
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deflate->avail_in = req->src_len;
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deflate->next_out = (u8 *)req->dst;
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deflate->avail_out = req->dst_len;
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ret = zlib_deflate(deflate, Z_FINISH);
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if (ret != Z_STREAM_END)
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return -EINVAL;
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req->dst_len = deflate->total_out;
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return 0;
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}
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static int deflate_decompress(struct zcomp_params *params,
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struct zcomp_ctx *ctx,
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struct zcomp_req *req)
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{
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struct deflate_ctx *zctx = ctx->context;
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struct z_stream_s *inflate;
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int ret;
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inflate = &zctx->dctx;
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ret = zlib_inflateReset(inflate);
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if (ret != Z_OK)
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return -EINVAL;
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inflate->next_in = (u8 *)req->src;
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inflate->avail_in = req->src_len;
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inflate->next_out = (u8 *)req->dst;
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inflate->avail_out = req->dst_len;
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ret = zlib_inflate(inflate, Z_SYNC_FLUSH);
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if (ret != Z_STREAM_END)
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return -EINVAL;
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return 0;
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}
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const struct zcomp_ops backend_deflate = {
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.compress = deflate_compress,
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.decompress = deflate_decompress,
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.create_ctx = deflate_create,
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.destroy_ctx = deflate_destroy,
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.setup_params = deflate_setup_params,
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.release_params = deflate_release_params,
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.name = "deflate",
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};
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