[linux] Expose ZSTD_compressSequences*() in the kernel

Make the functions ZSTD_compressSequences() and
ZSTD_compressSequencesAndLiterals() available in kernel space.
These will be used by Intel QAT driver.

Additionally, (1) expose the function ZSTD_CCtx_setParameter(), which is
required to set parameters before calling ZSTD_compressSequencesAndLiterals(),
(2) update the build process to include `compress/zstd_preSplit.o` and
(3) replace `asm/unaligned.h` with `linux/unaligned.h`.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>

contrib/linux-kernel/linux.mk

@@ -26,6 +26,7 @@ zstd_compress-y := \
 		compress/zstd_lazy.o \
 		compress/zstd_ldm.o \
 		compress/zstd_opt.o \
+		compress/zstd_preSplit.o \
 
 zstd_decompress-y := \
 		zstd_decompress_module.o \

contrib/linux-kernel/linux_zstd.h

@@ -136,9 +136,20 @@ typedef ZSTD_parameters zstd_parameters;
 zstd_parameters zstd_get_params(int level,
 	unsigned long long estimated_src_size);
 
-/* ======   Single-pass Compression   ====== */
-
 typedef ZSTD_CCtx zstd_cctx;
+typedef ZSTD_cParameter zstd_cparameter;
+
+/**
+ * zstd_cctx_set_param() - sets a compression parameter
+ * @cctx:         The context. Must have been initialized with zstd_init_cctx().
+ * @param:        The parameter to set.
+ * @value:        The value to set the parameter to.
+ *
+ * Return:        Zero or an error, which can be checked using zstd_is_error().
+ */
+size_t zstd_cctx_set_param(zstd_cctx *cctx, zstd_cparameter param, int value);
+
+/* ======   Single-pass Compression   ====== */
 
 /**
  * zstd_cctx_workspace_bound() - max memory needed to initialize a zstd_cctx
@@ -480,4 +491,53 @@ typedef ZSTD_FrameHeader zstd_frame_header;
 size_t zstd_get_frame_header(zstd_frame_header *params, const void *src,
 	size_t src_size);
 
+/**
+ * struct zstd_sequence - a sequence of literals or a match
+ *
+ * @offset: The offset of the match
+ * @litLength: The literal length of the sequence
+ * @matchLength: The match length of the sequence
+ * @rep: Represents which repeat offset is used
+ */
+typedef ZSTD_Sequence zstd_sequence;
+
+/**
+ * zstd_compress_sequences() - compress an array of zstd_sequence
+ *
+ * @cctx: The zstd compression context.
+ * @dst: The buffer to compress the data into.
+ * @dst_capacity: The size of the destination buffer.
+ * @in_seqs: The array of zstd_sequence to compress.
+ * @in_seqs_size: The number of sequences in in_seqs.
+ * @src: The input data to compress.
+ * @src_size: The size of the data to compress.
+ *
+ * Return: The compressed size or an error, which can be checked using
+ * 	   zstd_is_error().
+ */
+size_t zstd_compress_sequences(zstd_cctx *cctx, void* dst, size_t dst_capacity,
+			       const zstd_sequence *in_seqs, size_t in_seqs_size,
+			       const void* src, size_t src_size);
+
+/**
+ * zstd_compress_sequences_and_literals() - compress an array of zstd_sequence and literals
+ *
+ * @cctx: The zstd compression context.
+ * @dst: The buffer to compress the data into.
+ * @dst_capacity: The size of the destination buffer.
+ * @in_seqs: The array of zstd_sequence to compress.
+ * @in_seqs_size: The number of sequences in in_seqs.
+ * @literals: The literals associated to the sequences to be compressed.
+ * @lit_size: The size of the literals in the literals buffer.
+ * @lit_capacity: The size of the literals buffer.
+ * @decompressed_size: The size of the input data
+ *
+ * Return: The compressed size or an error, which can be checked using
+ * 	   zstd_is_error().
+ */
+size_t zstd_compress_sequences_and_literals(zstd_cctx *cctx, void* dst, size_t dst_capacity,
+					    const zstd_sequence *in_seqs, size_t in_seqs_size,
+					    const void* literals, size_t lit_size, size_t lit_capacity,
+					    size_t decompressed_size);
+
 #endif  /* LINUX_ZSTD_H */

contrib/linux-kernel/mem.h

@@ -15,7 +15,7 @@
 /*-****************************************
 *  Dependencies
 ******************************************/
-#include <asm/unaligned.h>  /* get_unaligned, put_unaligned* */
+#include <linux/unaligned.h>  /* get_unaligned, put_unaligned* */
 #include <linux/compiler.h>  /* inline */
 #include <linux/swab.h>  /* swab32, swab64 */
 #include <linux/types.h>  /* size_t, ptrdiff_t */

contrib/linux-kernel/test/include/linux/xxhash.h

@@ -296,7 +296,7 @@ XXH_API void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state
  * - xxHash source repository: https://github.com/Cyan4973/xxHash
  */
 
-#include <asm/unaligned.h>
+#include <linux/unaligned.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/module.h>

contrib/linux-kernel/zstd_compress_module.c

@@ -80,6 +80,12 @@ zstd_parameters zstd_get_params(int level,
 }
 EXPORT_SYMBOL(zstd_get_params);
 
+size_t zstd_cctx_set_param(zstd_cctx *cctx, ZSTD_cParameter param, int value)
+{
+	return ZSTD_CCtx_setParameter(cctx, param, value);
+}
+EXPORT_SYMBOL(zstd_cctx_set_param);
+
 size_t zstd_cctx_workspace_bound(const zstd_compression_parameters *cparams)
 {
 	return ZSTD_estimateCCtxSize_usingCParams(*cparams);
@@ -216,5 +222,25 @@ void zstd_register_sequence_producer(
 }
 EXPORT_SYMBOL(zstd_register_sequence_producer);
 
+size_t zstd_compress_sequences(zstd_cctx *cctx, void* dst, size_t dst_capacity,
+			       const zstd_sequence *in_seqs, size_t in_seqs_size,
+			       const void* src, size_t src_size)
+{
+	return ZSTD_compressSequences(cctx, dst, dst_capacity, in_seqs,
+				      in_seqs_size, src, src_size);
+}
+EXPORT_SYMBOL(zstd_compress_sequences);
+
+size_t zstd_compress_sequences_and_literals(zstd_cctx *cctx, void* dst, size_t dst_capacity,
+					    const zstd_sequence *in_seqs, size_t in_seqs_size,
+					    const void* literals, size_t lit_size, size_t lit_capacity,
+					    size_t decompressed_size)
+{
+	return ZSTD_compressSequencesAndLiterals(cctx, dst, dst_capacity, in_seqs,
+						 in_seqs_size, literals, lit_size,
+						 lit_capacity, decompressed_size);
+}
+EXPORT_SYMBOL(zstd_compress_sequences_and_literals);
+
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_DESCRIPTION("Zstd Compressor");