mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
80dcf0a783
Currently the high-level xor code chunks up all operations into small units for only up to 1 + 4 vectors, and passes it to four different methods. This means the FPU/vector context is entered and left a lot for wide stripes, and a lot of indirect expensive indirect calls are performed. Switch to passing the entire gen_xor request to the low-level ops, and provide a macro to dispatch it to the existing helper. This reduce the number of indirect calls and FPU/vector context switches by a factor approaching nr_stripes / 4, and also reduces source and binary code size. Link: https://lkml.kernel.org/r/20260327061704.3707577-27-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Eric Biggers <ebiggers@kernel.org> Tested-by: Eric Biggers <ebiggers@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Mason <clm@fb.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: David Sterba <dsterba@suse.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jason A. Donenfeld <jason@zx2c4.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Li Nan <linan122@huawei.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Magnus Lindholm <linmag7@gmail.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Richard Henderson <richard.henderson@linaro.org> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Song Liu <song@kernel.org> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Ted Ts'o <tytso@mit.edu> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _XOR_IMPL_H
|
|
#define _XOR_IMPL_H
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/minmax.h>
|
|
|
|
struct xor_block_template {
|
|
struct xor_block_template *next;
|
|
const char *name;
|
|
int speed;
|
|
void (*xor_gen)(void *dest, void **srcs, unsigned int src_cnt,
|
|
unsigned int bytes);
|
|
};
|
|
|
|
#define __DO_XOR_BLOCKS(_name, _handle1, _handle2, _handle3, _handle4) \
|
|
void \
|
|
xor_gen_##_name(void *dest, void **srcs, unsigned int src_cnt, \
|
|
unsigned int bytes) \
|
|
{ \
|
|
unsigned int src_off = 0; \
|
|
\
|
|
while (src_cnt > 0) { \
|
|
unsigned int this_cnt = min(src_cnt, 4); \
|
|
\
|
|
if (this_cnt == 1) \
|
|
_handle1(bytes, dest, srcs[src_off]); \
|
|
else if (this_cnt == 2) \
|
|
_handle2(bytes, dest, srcs[src_off], \
|
|
srcs[src_off + 1]); \
|
|
else if (this_cnt == 3) \
|
|
_handle3(bytes, dest, srcs[src_off], \
|
|
srcs[src_off + 1], srcs[src_off + 2]); \
|
|
else \
|
|
_handle4(bytes, dest, srcs[src_off], \
|
|
srcs[src_off + 1], srcs[src_off + 2], \
|
|
srcs[src_off + 3]); \
|
|
\
|
|
src_cnt -= this_cnt; \
|
|
src_off += this_cnt; \
|
|
} \
|
|
}
|
|
|
|
#define DO_XOR_BLOCKS(_name, _handle1, _handle2, _handle3, _handle4) \
|
|
static __DO_XOR_BLOCKS(_name, _handle1, _handle2, _handle3, _handle4)
|
|
|
|
/* generic implementations */
|
|
extern struct xor_block_template xor_block_8regs;
|
|
extern struct xor_block_template xor_block_32regs;
|
|
extern struct xor_block_template xor_block_8regs_p;
|
|
extern struct xor_block_template xor_block_32regs_p;
|
|
|
|
void __init xor_register(struct xor_block_template *tmpl);
|
|
void __init xor_force(struct xor_block_template *tmpl);
|
|
|
|
#endif /* _XOR_IMPL_H */
|