Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
Message-ID: <c47cd290-7e0c-db0b-d4a8-9db56fd67782@xen0n.name>
Date:   Thu, 19 May 2022 00:04:40 +0800
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.0a1
Subject: Re: [PATCH V11 08/22] LoongArch: Add other common headers
Content-Language: en-US
To:     Huacai Chen <chenhuacai@loongson.cn>,
        Arnd Bergmann <arnd@arndb.de>,
        Andy Lutomirski <luto@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        David Airlie <airlied@linux.ie>,
        Jonathan Corbet <corbet@lwn.net>,
        Linus Torvalds <torvalds@linux-foundation.org>
Cc:     linux-arch@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, Xuefeng Li <lixuefeng@loongson.cn>,
        Yanteng Si <siyanteng@loongson.cn>,
        Huacai Chen <chenhuacai@gmail.com>,
        Guo Ren <guoren@kernel.org>, Xuerui Wang <kernel@xen0n.name>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>
References: <20220518092619.1269111-1-chenhuacai@loongson.cn>
 <20220518092619.1269111-9-chenhuacai@loongson.cn>
From:   WANG Xuerui <kernel@xen0n.name>
In-Reply-To: <20220518092619.1269111-9-chenhuacai@loongson.cn>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 5/18/22 17:26, Huacai Chen wrote:
> Add some other common headers for basic LoongArch support.
>
> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
> ---
>   arch/loongarch/include/asm/asm-prototypes.h   |   7 +
>   arch/loongarch/include/asm/asm.h              | 187 ++++++++++++
>   arch/loongarch/include/asm/asmmacro.h         | 289 ++++++++++++++++++
>   arch/loongarch/include/asm/clocksource.h      |  12 +
>   arch/loongarch/include/asm/compiler.h         |  15 +
>   arch/loongarch/include/asm/inst.h             | 117 +++++++
>   arch/loongarch/include/asm/linkage.h          |  36 +++
>   arch/loongarch/include/asm/perf_event.h       |  10 +
>   arch/loongarch/include/asm/prefetch.h         |  29 ++
>   arch/loongarch/include/asm/serial.h           |  11 +
>   arch/loongarch/include/asm/time.h             |  50 +++
>   arch/loongarch/include/asm/timex.h            |  33 ++
>   arch/loongarch/include/asm/topology.h         |  15 +
>   arch/loongarch/include/asm/types.h            |  19 ++
>   arch/loongarch/include/uapi/asm/bitsperlong.h |   9 +
>   arch/loongarch/include/uapi/asm/byteorder.h   |  13 +
>   arch/loongarch/include/uapi/asm/reg.h         |  59 ++++
>   tools/include/uapi/asm/bitsperlong.h          |   2 +
>   18 files changed, 913 insertions(+)
>   create mode 100644 arch/loongarch/include/asm/asm-prototypes.h
>   create mode 100644 arch/loongarch/include/asm/asm.h
>   create mode 100644 arch/loongarch/include/asm/asmmacro.h
>   create mode 100644 arch/loongarch/include/asm/clocksource.h
>   create mode 100644 arch/loongarch/include/asm/compiler.h
>   create mode 100644 arch/loongarch/include/asm/inst.h
>   create mode 100644 arch/loongarch/include/asm/linkage.h
>   create mode 100644 arch/loongarch/include/asm/perf_event.h
>   create mode 100644 arch/loongarch/include/asm/prefetch.h
>   create mode 100644 arch/loongarch/include/asm/serial.h
>   create mode 100644 arch/loongarch/include/asm/time.h
>   create mode 100644 arch/loongarch/include/asm/timex.h
>   create mode 100644 arch/loongarch/include/asm/topology.h
>   create mode 100644 arch/loongarch/include/asm/types.h
>   create mode 100644 arch/loongarch/include/uapi/asm/bitsperlong.h
>   create mode 100644 arch/loongarch/include/uapi/asm/byteorder.h
>   create mode 100644 arch/loongarch/include/uapi/asm/reg.h
>
> diff --git a/arch/loongarch/include/asm/asm-prototypes.h b/arch/loongarch/include/asm/asm-prototypes.h
> new file mode 100644
> index 000000000000..ed06d3997420
> --- /dev/null
> +++ b/arch/loongarch/include/asm/asm-prototypes.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#include <linux/uaccess.h>
> +#include <asm/fpu.h>
> +#include <asm/mmu_context.h>
> +#include <asm/page.h>
> +#include <asm/ftrace.h>
> +#include <asm-generic/asm-prototypes.h>
> diff --git a/arch/loongarch/include/asm/asm.h b/arch/loongarch/include/asm/asm.h
> new file mode 100644
> index 000000000000..a387773ba5d0
> --- /dev/null
> +++ b/arch/loongarch/include/asm/asm.h
> @@ -0,0 +1,187 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Some useful macros for LoongArch assembler code
> + *
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + *
> + * Derived from MIPS:
> + * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
> + * Copyright (C) 1999 by Silicon Graphics, Inc.
> + * Copyright (C) 2001 MIPS Technologies, Inc.
> + * Copyright (C) 2002  Maciej W. Rozycki
> + */
> +#ifndef __ASM_ASM_H
> +#define __ASM_ASM_H
> +
> +/* LoongArch pref instruction. */
> +#ifdef CONFIG_CPU_HAS_PREFETCH
> +
> +#define PREF(hint, addr, offs)				\
> +		preld	hint, addr, offs;		\
> +
> +#define PREFX(hint, addr, index)			\
> +		preldx	hint, addr, index;		\
> +
> +#else /* !CONFIG_CPU_HAS_PREFETCH */
> +
> +#define PREF(hint, addr, offs)
> +#define PREFX(hint, addr, index)
> +
> +#endif /* !CONFIG_CPU_HAS_PREFETCH */
Actually I didn't spot any usage of these 2 macros, so they can be removed?
> +
> +/*
> + * Stack alignment
> + */
> +#define STACK_ALIGN	~(0xf)
> +
> +/*
> + * Macros to handle different pointer/register sizes for 32/64-bit code
> + */
> +
> +/*
> + * Size of a register
> + */
> +#ifndef __loongarch64
> +#define SZREG	4
> +#else
> +#define SZREG	8
> +#endif
> +
> +/*
> + * Use the following macros in assemblercode to load/store registers,
> + * pointers etc.
> + */
> +#if (SZREG == 4)
> +#define REG_L		ld.w
> +#define REG_S		st.w
> +#define REG_ADD		add.w
> +#define REG_SUB		sub.w
> +#else /* SZREG == 8 */
> +#define REG_L		ld.d
> +#define REG_S		st.d
> +#define REG_ADD		add.d
> +#define REG_SUB		sub.d
> +#endif
> +
> +/*
> + * How to add/sub/load/store/shift C int variables.
> + */
> +#if (__SIZEOF_INT__ == 4)
> +#define INT_ADD		add.w
> +#define INT_ADDI	addi.w
> +#define INT_SUB		sub.w
> +#define INT_L		ld.w
> +#define INT_S		st.w
> +#define INT_SLL		slli.w
> +#define INT_SLLV	sll.w
> +#define INT_SRL		srli.w
> +#define INT_SRLV	srl.w
> +#define INT_SRA		srai.w
> +#define INT_SRAV	sra.w
> +#endif
> +
> +#if (__SIZEOF_INT__ == 8)
> +#define INT_ADD		add.d
> +#define INT_ADDI	addi.d
> +#define INT_SUB		sub.d
> +#define INT_L		ld.d
> +#define INT_S		st.d
> +#define INT_SLL		slli.d
> +#define INT_SLLV	sll.d
> +#define INT_SRL		srli.d
> +#define INT_SRLV	srl.d
> +#define INT_SRA		srai.d
> +#define INT_SRAV	sra.d
> +#endif
> +
> +/*
> + * How to add/sub/load/store/shift C long variables.
> + */
> +#if (__SIZEOF_LONG__ == 4)
> +#define LONG_ADD	add.w
> +#define LONG_ADDI	addi.w
> +#define LONG_SUB	sub.w
> +#define LONG_L		ld.w
> +#define LONG_S		st.w
> +#define LONG_SLL	slli.w
> +#define LONG_SLLV	sll.w
> +#define LONG_SRL	srli.w
> +#define LONG_SRLV	srl.w
> +#define LONG_SRA	srai.w
> +#define LONG_SRAV	sra.w
> +
> +#ifdef __ASSEMBLY__
> +#define LONG		.word
> +#endif
> +#define LONGSIZE	4
> +#define LONGMASK	3
> +#define LONGLOG		2
> +#endif
> +
> +#if (__SIZEOF_LONG__ == 8)
> +#define LONG_ADD	add.d
> +#define LONG_ADDI	addi.d
> +#define LONG_SUB	sub.d
> +#define LONG_L		ld.d
> +#define LONG_S		st.d
> +#define LONG_SLL	slli.d
> +#define LONG_SLLV	sll.d
> +#define LONG_SRL	srli.d
> +#define LONG_SRLV	srl.d
> +#define LONG_SRA	srai.d
> +#define LONG_SRAV	sra.d
> +
> +#ifdef __ASSEMBLY__
> +#define LONG		.dword
> +#endif
> +#define LONGSIZE	8
> +#define LONGMASK	7
> +#define LONGLOG		3
> +#endif
> +
> +/*
> + * How to add/sub/load/store/shift pointers.
> + */
> +#if (__SIZEOF_POINTER__ == 4)
> +#define PTR_ADD		add.w
> +#define PTR_ADDI	addi.w
> +#define PTR_SUB		sub.w
> +#define PTR_L		ld.w
> +#define PTR_S		st.w
> +#define PTR_LI		li.w
> +#define PTR_SLL		slli.w
> +#define PTR_SLLV	sll.w
> +#define PTR_SRL		srli.w
> +#define PTR_SRLV	srl.w
> +#define PTR_SRA		srai.w
> +#define PTR_SRAV	sra.w
> +
> +#define PTR_SCALESHIFT	2
> +
> +#define PTR		.word
> +#define PTRSIZE		4
> +#define PTRLOG		2
> +#endif
> +
> +#if (__SIZEOF_POINTER__ == 8)
> +#define PTR_ADD		add.d
> +#define PTR_ADDI	addi.d
> +#define PTR_SUB		sub.d
> +#define PTR_L		ld.d
> +#define PTR_S		st.d
> +#define PTR_LI		li.d
> +#define PTR_SLL		slli.d
> +#define PTR_SLLV	sll.d
> +#define PTR_SRL		srli.d
> +#define PTR_SRLV	srl.d
> +#define PTR_SRA		srai.d
> +#define PTR_SRAV	sra.d
> +
> +#define PTR_SCALESHIFT	3
> +
> +#define PTR		.dword
> +#define PTRSIZE		8
> +#define PTRLOG		3
> +#endif

Actually I've overlooked in v10, but it seems most of the definitions 
here are unused; I only see LONG_{L,S,ADD} and PTR_{LI,S,ADD,ADDI}, for 
example.

Can we strip down these definitions?

> +
> +#endif /* __ASM_ASM_H */
> diff --git a/arch/loongarch/include/asm/asmmacro.h b/arch/loongarch/include/asm/asmmacro.h
> new file mode 100644
> index 000000000000..a1a04083bd67
> --- /dev/null
> +++ b/arch/loongarch/include/asm/asmmacro.h
> @@ -0,0 +1,289 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_ASMMACRO_H
> +#define _ASM_ASMMACRO_H
> +
> +#include <asm/asm-offsets.h>
> +#include <asm/regdef.h>
> +#include <asm/fpregdef.h>
> +#include <asm/loongarch.h>
> +
> +	.macro	parse_v var val
> +	\var	= \val
> +	.endm
> +
> +	.macro	parse_r var r
> +	\var	= -1
> +	.ifc	\r, $r0
> +	\var	= 0
> +	.endif
> +	.ifc	\r, $r1
> +	\var	= 1
> +	.endif
> +	.ifc	\r, $r2
> +	\var	= 2
> +	.endif
> +	.ifc	\r, $r3
> +	\var	= 3
> +	.endif
> +	.ifc	\r, $r4
> +	\var	= 4
> +	.endif
> +	.ifc	\r, $r5
> +	\var	= 5
> +	.endif
> +	.ifc	\r, $r6
> +	\var	= 6
> +	.endif
> +	.ifc	\r, $r7
> +	\var	= 7
> +	.endif
> +	.ifc	\r, $r8
> +	\var	= 8
> +	.endif
> +	.ifc	\r, $r9
> +	\var	= 9
> +	.endif
> +	.ifc	\r, $r10
> +	\var	= 10
> +	.endif
> +	.ifc	\r, $r11
> +	\var	= 11
> +	.endif
> +	.ifc	\r, $r12
> +	\var	= 12
> +	.endif
> +	.ifc	\r, $r13
> +	\var	= 13
> +	.endif
> +	.ifc	\r, $r14
> +	\var	= 14
> +	.endif
> +	.ifc	\r, $r15
> +	\var	= 15
> +	.endif
> +	.ifc	\r, $r16
> +	\var	= 16
> +	.endif
> +	.ifc	\r, $r17
> +	\var	= 17
> +	.endif
> +	.ifc	\r, $r18
> +	\var	= 18
> +	.endif
> +	.ifc	\r, $r19
> +	\var	= 19
> +	.endif
> +	.ifc	\r, $r20
> +	\var	= 20
> +	.endif
> +	.ifc	\r, $r21
> +	\var	= 21
> +	.endif
> +	.ifc	\r, $r22
> +	\var	= 22
> +	.endif
> +	.ifc	\r, $r23
> +	\var	= 23
> +	.endif
> +	.ifc	\r, $r24
> +	\var	= 24
> +	.endif
> +	.ifc	\r, $r25
> +	\var	= 25
> +	.endif
> +	.ifc	\r, $r26
> +	\var	= 26
> +	.endif
> +	.ifc	\r, $r27
> +	\var	= 27
> +	.endif
> +	.ifc	\r, $r28
> +	\var	= 28
> +	.endif
> +	.ifc	\r, $r29
> +	\var	= 29
> +	.endif
> +	.ifc	\r, $r30
> +	\var	= 30
> +	.endif
> +	.ifc	\r, $r31
> +	\var	= 31
> +	.endif
> +	.iflt	\var
> +	.error	"Unable to parse register name \r"
> +	.endif
> +	.endm
> +
> +	.macro	cpu_save_nonscratch thread
> +	stptr.d	s0, \thread, THREAD_REG23
> +	stptr.d	s1, \thread, THREAD_REG24
> +	stptr.d	s2, \thread, THREAD_REG25
> +	stptr.d	s3, \thread, THREAD_REG26
> +	stptr.d	s4, \thread, THREAD_REG27
> +	stptr.d	s5, \thread, THREAD_REG28
> +	stptr.d	s6, \thread, THREAD_REG29
> +	stptr.d	s7, \thread, THREAD_REG30
> +	stptr.d	s8, \thread, THREAD_REG31
> +	stptr.d	sp, \thread, THREAD_REG03
> +	stptr.d	fp, \thread, THREAD_REG22
> +	.endm
> +
> +	.macro	cpu_restore_nonscratch thread
> +	ldptr.d	s0, \thread, THREAD_REG23
> +	ldptr.d	s1, \thread, THREAD_REG24
> +	ldptr.d	s2, \thread, THREAD_REG25
> +	ldptr.d	s3, \thread, THREAD_REG26
> +	ldptr.d	s4, \thread, THREAD_REG27
> +	ldptr.d	s5, \thread, THREAD_REG28
> +	ldptr.d	s6, \thread, THREAD_REG29
> +	ldptr.d	s7, \thread, THREAD_REG30
> +	ldptr.d	s8, \thread, THREAD_REG31
> +	ldptr.d	ra, \thread, THREAD_REG01
> +	ldptr.d	sp, \thread, THREAD_REG03
> +	ldptr.d	fp, \thread, THREAD_REG22
> +	.endm
> +
> +	.macro fpu_save_csr thread tmp
> +	movfcsr2gr	\tmp, fcsr0
> +	stptr.w	\tmp, \thread, THREAD_FCSR
> +	.endm
> +
> +	.macro fpu_restore_csr thread tmp
> +	ldptr.w	\tmp, \thread, THREAD_FCSR
> +	movgr2fcsr	fcsr0, \tmp
> +	.endm
> +
> +	.macro fpu_save_cc thread tmp0 tmp1
> +	movcf2gr	\tmp0, $fcc0
> +	move	\tmp1, \tmp0
> +	movcf2gr	\tmp0, $fcc1
> +	bstrins.d	\tmp1, \tmp0, 15, 8
> +	movcf2gr	\tmp0, $fcc2
> +	bstrins.d	\tmp1, \tmp0, 23, 16
> +	movcf2gr	\tmp0, $fcc3
> +	bstrins.d	\tmp1, \tmp0, 31, 24
> +	movcf2gr	\tmp0, $fcc4
> +	bstrins.d	\tmp1, \tmp0, 39, 32
> +	movcf2gr	\tmp0, $fcc5
> +	bstrins.d	\tmp1, \tmp0, 47, 40
> +	movcf2gr	\tmp0, $fcc6
> +	bstrins.d	\tmp1, \tmp0, 55, 48
> +	movcf2gr	\tmp0, $fcc7
> +	bstrins.d	\tmp1, \tmp0, 63, 56
> +	stptr.d		\tmp1, \thread, THREAD_FCC
> +	.endm
> +
> +	.macro fpu_restore_cc thread tmp0 tmp1
> +	ldptr.d	\tmp0, \thread, THREAD_FCC
> +	bstrpick.d	\tmp1, \tmp0, 7, 0
> +	movgr2cf	$fcc0, \tmp1
> +	bstrpick.d	\tmp1, \tmp0, 15, 8
> +	movgr2cf	$fcc1, \tmp1
> +	bstrpick.d	\tmp1, \tmp0, 23, 16
> +	movgr2cf	$fcc2, \tmp1
> +	bstrpick.d	\tmp1, \tmp0, 31, 24
> +	movgr2cf	$fcc3, \tmp1
> +	bstrpick.d	\tmp1, \tmp0, 39, 32
> +	movgr2cf	$fcc4, \tmp1
> +	bstrpick.d	\tmp1, \tmp0, 47, 40
> +	movgr2cf	$fcc5, \tmp1
> +	bstrpick.d	\tmp1, \tmp0, 55, 48
> +	movgr2cf	$fcc6, \tmp1
> +	bstrpick.d	\tmp1, \tmp0, 63, 56
> +	movgr2cf	$fcc7, \tmp1
> +	.endm
> +
> +	.macro	fpu_save_double thread tmp
> +	li.w	\tmp, THREAD_FPR0
> +	PTR_ADD \tmp, \tmp, \thread
> +	fst.d	$f0, \tmp, THREAD_FPR0  - THREAD_FPR0
> +	fst.d	$f1, \tmp, THREAD_FPR1  - THREAD_FPR0
> +	fst.d	$f2, \tmp, THREAD_FPR2  - THREAD_FPR0
> +	fst.d	$f3, \tmp, THREAD_FPR3  - THREAD_FPR0
> +	fst.d	$f4, \tmp, THREAD_FPR4  - THREAD_FPR0
> +	fst.d	$f5, \tmp, THREAD_FPR5  - THREAD_FPR0
> +	fst.d	$f6, \tmp, THREAD_FPR6  - THREAD_FPR0
> +	fst.d	$f7, \tmp, THREAD_FPR7  - THREAD_FPR0
> +	fst.d	$f8, \tmp, THREAD_FPR8  - THREAD_FPR0
> +	fst.d	$f9, \tmp, THREAD_FPR9  - THREAD_FPR0
> +	fst.d	$f10, \tmp, THREAD_FPR10 - THREAD_FPR0
> +	fst.d	$f11, \tmp, THREAD_FPR11 - THREAD_FPR0
> +	fst.d	$f12, \tmp, THREAD_FPR12 - THREAD_FPR0
> +	fst.d	$f13, \tmp, THREAD_FPR13 - THREAD_FPR0
> +	fst.d	$f14, \tmp, THREAD_FPR14 - THREAD_FPR0
> +	fst.d	$f15, \tmp, THREAD_FPR15 - THREAD_FPR0
> +	fst.d	$f16, \tmp, THREAD_FPR16 - THREAD_FPR0
> +	fst.d	$f17, \tmp, THREAD_FPR17 - THREAD_FPR0
> +	fst.d	$f18, \tmp, THREAD_FPR18 - THREAD_FPR0
> +	fst.d	$f19, \tmp, THREAD_FPR19 - THREAD_FPR0
> +	fst.d	$f20, \tmp, THREAD_FPR20 - THREAD_FPR0
> +	fst.d	$f21, \tmp, THREAD_FPR21 - THREAD_FPR0
> +	fst.d	$f22, \tmp, THREAD_FPR22 - THREAD_FPR0
> +	fst.d	$f23, \tmp, THREAD_FPR23 - THREAD_FPR0
> +	fst.d	$f24, \tmp, THREAD_FPR24 - THREAD_FPR0
> +	fst.d	$f25, \tmp, THREAD_FPR25 - THREAD_FPR0
> +	fst.d	$f26, \tmp, THREAD_FPR26 - THREAD_FPR0
> +	fst.d	$f27, \tmp, THREAD_FPR27 - THREAD_FPR0
> +	fst.d	$f28, \tmp, THREAD_FPR28 - THREAD_FPR0
> +	fst.d	$f29, \tmp, THREAD_FPR29 - THREAD_FPR0
> +	fst.d	$f30, \tmp, THREAD_FPR30 - THREAD_FPR0
> +	fst.d	$f31, \tmp, THREAD_FPR31 - THREAD_FPR0
> +	.endm
> +
> +	.macro	fpu_restore_double thread tmp
> +	li.w	\tmp, THREAD_FPR0
> +	PTR_ADD \tmp, \tmp, \thread
> +	fld.d	$f0, \tmp, THREAD_FPR0  - THREAD_FPR0
> +	fld.d	$f1, \tmp, THREAD_FPR1  - THREAD_FPR0
> +	fld.d	$f2, \tmp, THREAD_FPR2  - THREAD_FPR0
> +	fld.d	$f3, \tmp, THREAD_FPR3  - THREAD_FPR0
> +	fld.d	$f4, \tmp, THREAD_FPR4  - THREAD_FPR0
> +	fld.d	$f5, \tmp, THREAD_FPR5  - THREAD_FPR0
> +	fld.d	$f6, \tmp, THREAD_FPR6  - THREAD_FPR0
> +	fld.d	$f7, \tmp, THREAD_FPR7  - THREAD_FPR0
> +	fld.d	$f8, \tmp, THREAD_FPR8  - THREAD_FPR0
> +	fld.d	$f9, \tmp, THREAD_FPR9  - THREAD_FPR0
> +	fld.d	$f10, \tmp, THREAD_FPR10 - THREAD_FPR0
> +	fld.d	$f11, \tmp, THREAD_FPR11 - THREAD_FPR0
> +	fld.d	$f12, \tmp, THREAD_FPR12 - THREAD_FPR0
> +	fld.d	$f13, \tmp, THREAD_FPR13 - THREAD_FPR0
> +	fld.d	$f14, \tmp, THREAD_FPR14 - THREAD_FPR0
> +	fld.d	$f15, \tmp, THREAD_FPR15 - THREAD_FPR0
> +	fld.d	$f16, \tmp, THREAD_FPR16 - THREAD_FPR0
> +	fld.d	$f17, \tmp, THREAD_FPR17 - THREAD_FPR0
> +	fld.d	$f18, \tmp, THREAD_FPR18 - THREAD_FPR0
> +	fld.d	$f19, \tmp, THREAD_FPR19 - THREAD_FPR0
> +	fld.d	$f20, \tmp, THREAD_FPR20 - THREAD_FPR0
> +	fld.d	$f21, \tmp, THREAD_FPR21 - THREAD_FPR0
> +	fld.d	$f22, \tmp, THREAD_FPR22 - THREAD_FPR0
> +	fld.d	$f23, \tmp, THREAD_FPR23 - THREAD_FPR0
> +	fld.d	$f24, \tmp, THREAD_FPR24 - THREAD_FPR0
> +	fld.d	$f25, \tmp, THREAD_FPR25 - THREAD_FPR0
> +	fld.d	$f26, \tmp, THREAD_FPR26 - THREAD_FPR0
> +	fld.d	$f27, \tmp, THREAD_FPR27 - THREAD_FPR0
> +	fld.d	$f28, \tmp, THREAD_FPR28 - THREAD_FPR0
> +	fld.d	$f29, \tmp, THREAD_FPR29 - THREAD_FPR0
> +	fld.d	$f30, \tmp, THREAD_FPR30 - THREAD_FPR0
> +	fld.d	$f31, \tmp, THREAD_FPR31 - THREAD_FPR0
> +	.endm
> +
> +.macro not dst src
> +	nor	\dst, \src, zero
> +.endm
> +
> +.macro bgt r0 r1 label
> +	blt	\r1, \r0, \label
> +.endm
> +
> +.macro bltz r0 label
> +	blt	\r0, zero, \label
> +.endm
> +
> +.macro bgez r0 label
> +	bge	\r0, zero, \label
> +.endm
> +
> +#endif /* _ASM_ASMMACRO_H */
> diff --git a/arch/loongarch/include/asm/clocksource.h b/arch/loongarch/include/asm/clocksource.h
> new file mode 100644
> index 000000000000..58e64aa05d26
> --- /dev/null
> +++ b/arch/loongarch/include/asm/clocksource.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Author: Huacai Chen <chenhuacai@loongson.cn>
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __ASM_CLOCKSOURCE_H
> +#define __ASM_CLOCKSOURCE_H
> +
> +#include <asm/vdso/clocksource.h>
> +
> +#endif /* __ASM_CLOCKSOURCE_H */
> diff --git a/arch/loongarch/include/asm/compiler.h b/arch/loongarch/include/asm/compiler.h
> new file mode 100644
> index 000000000000..657cebe70ace
> --- /dev/null
> +++ b/arch/loongarch/include/asm/compiler.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_COMPILER_H
> +#define _ASM_COMPILER_H
> +
> +#define GCC_OFF_SMALL_ASM() "ZC"
> +
> +#define LOONGARCH_ISA_LEVEL "loongarch"
> +#define LOONGARCH_ISA_ARCH_LEVEL "arch=loongarch"
> +#define LOONGARCH_ISA_LEVEL_RAW loongarch
> +#define LOONGARCH_ISA_ARCH_LEVEL_RAW LOONGARCH_ISA_LEVEL_RAW
> +
> +#endif /* _ASM_COMPILER_H */
> diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
> new file mode 100644
> index 000000000000..575d1bb66ffb
> --- /dev/null
> +++ b/arch/loongarch/include/asm/inst.h
> @@ -0,0 +1,117 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_INST_H
> +#define _ASM_INST_H
> +
> +#include <linux/types.h>
> +#include <asm/asm.h>
> +
> +#define ADDR_IMMMASK_LU52ID	0xFFF0000000000000
> +#define ADDR_IMMMASK_LU32ID	0x000FFFFF00000000
> +#define ADDR_IMMMASK_ADDU16ID	0x00000000FFFF0000
> +
> +#define ADDR_IMMSHIFT_LU52ID	52
> +#define ADDR_IMMSHIFT_LU32ID	32
> +#define ADDR_IMMSHIFT_ADDU16ID	16
> +
> +#define ADDR_IMM(addr, INSN)	((addr & ADDR_IMMMASK_##INSN) >> ADDR_IMMSHIFT_##INSN)
> +
> +enum reg1i20_op {
> +	lu12iw_op	= 0x0a,
> +	lu32id_op	= 0x0b,
> +};
> +
> +enum reg2i12_op {
> +	lu52id_op	= 0x0c,
> +};
> +
> +enum reg2i16_op {
> +	jirl_op		= 0x13,
> +};
> +
> +struct reg0i26_format {
> +	unsigned int immediate_h : 10;
> +	unsigned int immediate_l : 16;
> +	unsigned int opcode : 6;
> +};
> +
> +struct reg1i20_format {
> +	unsigned int rd : 5;
> +	unsigned int immediate : 20;
> +	unsigned int opcode : 7;
> +};
> +
> +struct reg1i21_format {
> +	unsigned int immediate_h  : 5;
> +	unsigned int rj : 5;
> +	unsigned int immediate_l : 16;
> +	unsigned int opcode : 6;
> +};
> +
> +struct reg2i12_format {
> +	unsigned int rd : 5;
> +	unsigned int rj : 5;
> +	unsigned int immediate : 12;
> +	unsigned int opcode : 10;
> +};
> +
> +struct reg2i16_format {
> +	unsigned int rd : 5;
> +	unsigned int rj : 5;
> +	unsigned int immediate : 16;
> +	unsigned int opcode : 6;
> +};
> +
> +union loongarch_instruction {
> +	unsigned int word;
> +	struct reg0i26_format reg0i26_format;
> +	struct reg1i20_format reg1i20_format;
> +	struct reg1i21_format reg1i21_format;
> +	struct reg2i12_format reg2i12_format;
> +	struct reg2i16_format reg2i16_format;
> +};
> +
> +#define LOONGARCH_INSN_SIZE	sizeof(union loongarch_instruction)
> +
> +enum loongarch_gpr {
> +	LOONGARCH_GPR_ZERO = 0,
> +	LOONGARCH_GPR_RA = 1,
> +	LOONGARCH_GPR_TP = 2,
> +	LOONGARCH_GPR_SP = 3,
> +	LOONGARCH_GPR_A0 = 4,	/* Reused as V0 for return value */
> +	LOONGARCH_GPR_A1,	/* Reused as V1 for return value */
> +	LOONGARCH_GPR_A2,
> +	LOONGARCH_GPR_A3,
> +	LOONGARCH_GPR_A4,
> +	LOONGARCH_GPR_A5,
> +	LOONGARCH_GPR_A6,
> +	LOONGARCH_GPR_A7,
> +	LOONGARCH_GPR_T0 = 12,
> +	LOONGARCH_GPR_T1,
> +	LOONGARCH_GPR_T2,
> +	LOONGARCH_GPR_T3,
> +	LOONGARCH_GPR_T4,
> +	LOONGARCH_GPR_T5,
> +	LOONGARCH_GPR_T6,
> +	LOONGARCH_GPR_T7,
> +	LOONGARCH_GPR_T8,
> +	LOONGARCH_GPR_FP = 22,
> +	LOONGARCH_GPR_S0 = 23,
> +	LOONGARCH_GPR_S1,
> +	LOONGARCH_GPR_S2,
> +	LOONGARCH_GPR_S3,
> +	LOONGARCH_GPR_S4,
> +	LOONGARCH_GPR_S5,
> +	LOONGARCH_GPR_S6,
> +	LOONGARCH_GPR_S7,
> +	LOONGARCH_GPR_S8,
> +	LOONGARCH_GPR_MAX
> +};
> +
> +u32 larch_insn_gen_lu32id(enum loongarch_gpr rd, int imm);
> +u32 larch_insn_gen_lu52id(enum loongarch_gpr rd, enum loongarch_gpr rj, int imm);
> +u32 larch_insn_gen_jirl(enum loongarch_gpr rd, enum loongarch_gpr rj, unsigned long pc, unsigned long dest);
> +
> +#endif /* _ASM_INST_H */
> diff --git a/arch/loongarch/include/asm/linkage.h b/arch/loongarch/include/asm/linkage.h
> new file mode 100644
> index 000000000000..81b0c4cfbf4f
> --- /dev/null
> +++ b/arch/loongarch/include/asm/linkage.h
> @@ -0,0 +1,36 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __ASM_LINKAGE_H
> +#define __ASM_LINKAGE_H
> +
> +#define __ALIGN		.align 2
> +#define __ALIGN_STR	__stringify(__ALIGN)
> +
> +#define SYM_FUNC_START(name)				\
> +	SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)	\
> +	.cfi_startproc;
> +
> +#define SYM_FUNC_START_NOALIGN(name)			\
> +	SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE)	\
> +	.cfi_startproc;
> +
> +#define SYM_FUNC_START_LOCAL(name)			\
> +	SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN)	\
> +	.cfi_startproc;
> +
> +#define SYM_FUNC_START_LOCAL_NOALIGN(name)		\
> +	SYM_START(name, SYM_L_LOCAL, SYM_A_NONE)	\
> +	.cfi_startproc;
> +
> +#define SYM_FUNC_START_WEAK(name)			\
> +	SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN)	\
> +	.cfi_startproc;
> +
> +#define SYM_FUNC_START_WEAK_NOALIGN(name)		\
> +	SYM_START(name, SYM_L_WEAK, SYM_A_NONE)		\
> +	.cfi_startproc;
> +
> +#define SYM_FUNC_END(name)				\
> +	.cfi_endproc;					\
> +	SYM_END(name, SYM_T_FUNC)
> +
> +#endif
> diff --git a/arch/loongarch/include/asm/perf_event.h b/arch/loongarch/include/asm/perf_event.h
> new file mode 100644
> index 000000000000..dcb3b17053a8
> --- /dev/null
> +++ b/arch/loongarch/include/asm/perf_event.h
> @@ -0,0 +1,10 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Author: Huacai Chen <chenhuacai@loongson.cn>
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __LOONGARCH_PERF_EVENT_H__
> +#define __LOONGARCH_PERF_EVENT_H__
> +/* Nothing to show here; the file is required by linux/perf_event.h. */
> +#endif /* __LOONGARCH_PERF_EVENT_H__ */
> diff --git a/arch/loongarch/include/asm/prefetch.h b/arch/loongarch/include/asm/prefetch.h
> new file mode 100644
> index 000000000000..1672262a5e2e
> --- /dev/null
> +++ b/arch/loongarch/include/asm/prefetch.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef __ASM_PREFETCH_H
> +#define __ASM_PREFETCH_H
> +
> +#define Pref_Load	0
> +#define Pref_Store	8
> +
> +#ifdef __ASSEMBLY__
> +
> +	.macro	__pref hint addr
> +#ifdef CONFIG_CPU_HAS_PREFETCH
> +	preld	\hint, \addr, 0
> +#endif
> +	.endm
> +
> +	.macro	pref_load addr
> +	__pref	Pref_Load, \addr
> +	.endm
> +
> +	.macro	pref_store addr
> +	__pref	Pref_Store, \addr
> +	.endm
> +
> +#endif
> +
> +#endif /* __ASM_PREFETCH_H */
> diff --git a/arch/loongarch/include/asm/serial.h b/arch/loongarch/include/asm/serial.h
> new file mode 100644
> index 000000000000..3fb550eb9115
> --- /dev/null
> +++ b/arch/loongarch/include/asm/serial.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef __ASM__SERIAL_H
> +#define __ASM__SERIAL_H
> +
> +#define BASE_BAUD 0
> +#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
> +
> +#endif /* __ASM__SERIAL_H */
> diff --git a/arch/loongarch/include/asm/time.h b/arch/loongarch/include/asm/time.h
> new file mode 100644
> index 000000000000..2eae219301d0
> --- /dev/null
> +++ b/arch/loongarch/include/asm/time.h
> @@ -0,0 +1,50 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_TIME_H
> +#define _ASM_TIME_H
> +
> +#include <linux/clockchips.h>
> +#include <linux/clocksource.h>
> +#include <asm/loongarch.h>
> +
> +extern u64 cpu_clock_freq;
> +extern u64 const_clock_freq;
> +
> +extern void sync_counter(void);
> +
> +static inline unsigned int calc_const_freq(void)
> +{
> +	unsigned int res;
> +	unsigned int base_freq;
> +	unsigned int cfm, cfd;
> +
> +	res = read_cpucfg(LOONGARCH_CPUCFG2);
> +	if (!(res & CPUCFG2_LLFTP))
> +		return 0;
> +
> +	base_freq = read_cpucfg(LOONGARCH_CPUCFG4);
> +	res = read_cpucfg(LOONGARCH_CPUCFG5);
> +	cfm = res & 0xffff;
> +	cfd = (res >> 16) & 0xffff;
> +
> +	if (!base_freq || !cfm || !cfd)
> +		return 0;
> +
> +	return (base_freq * cfm / cfd);
> +}
> +
> +/*
> + * Initialize the calling CPU's timer interrupt as clockevent device
> + */
> +extern int constant_clockevent_init(void);
> +extern int constant_clocksource_init(void);
> +
> +static inline void clockevent_set_clock(struct clock_event_device *cd,
> +					unsigned int clock)
> +{
> +	clockevents_calc_mult_shift(cd, clock, 4);
> +}
> +
> +#endif /* _ASM_TIME_H */
> diff --git a/arch/loongarch/include/asm/timex.h b/arch/loongarch/include/asm/timex.h
> new file mode 100644
> index 000000000000..d3ed99a4fdbd
> --- /dev/null
> +++ b/arch/loongarch/include/asm/timex.h
> @@ -0,0 +1,33 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_TIMEX_H
> +#define _ASM_TIMEX_H
> +
> +#ifdef __KERNEL__
> +
> +#include <linux/compiler.h>
> +
> +#include <asm/cpu.h>
> +#include <asm/cpu-features.h>
> +
> +/*
> + * Standard way to access the cycle counter.
> + * Currently only used on SMP for scheduling.
> + *
> + * We know that all SMP capable CPUs have cycle counters.
> + */
> +
> +typedef unsigned long cycles_t;
> +
> +#define get_cycles get_cycles
> +
> +static inline cycles_t get_cycles(void)
> +{
> +	return drdtime();
> +}
> +
> +#endif /* __KERNEL__ */
> +
> +#endif /*  _ASM_TIMEX_H */
> diff --git a/arch/loongarch/include/asm/topology.h b/arch/loongarch/include/asm/topology.h
> new file mode 100644
> index 000000000000..9ac71a25207a
> --- /dev/null
> +++ b/arch/loongarch/include/asm/topology.h
> @@ -0,0 +1,15 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef __ASM_TOPOLOGY_H
> +#define __ASM_TOPOLOGY_H
> +
> +#include <linux/smp.h>
> +
> +#define cpu_logical_map(cpu)  0
> +
> +#include <asm-generic/topology.h>
> +
> +static inline void arch_fix_phys_package_id(int num, u32 slot) { }
> +#endif /* __ASM_TOPOLOGY_H */
> diff --git a/arch/loongarch/include/asm/types.h b/arch/loongarch/include/asm/types.h
> new file mode 100644
> index 000000000000..baf15a0dcf8b
> --- /dev/null
> +++ b/arch/loongarch/include/asm/types.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_TYPES_H
> +#define _ASM_TYPES_H
> +
> +#include <asm-generic/int-ll64.h>
> +#include <uapi/asm/types.h>
> +
> +#ifdef __ASSEMBLY__
> +#define _ULCAST_
> +#define _U64CAST_
> +#else
> +#define _ULCAST_ (unsigned long)
> +#define _U64CAST_ (u64)
> +#endif
> +
> +#endif /* _ASM_TYPES_H */
> diff --git a/arch/loongarch/include/uapi/asm/bitsperlong.h b/arch/loongarch/include/uapi/asm/bitsperlong.h
> new file mode 100644
> index 000000000000..00b4ba1e5cdf
> --- /dev/null
> +++ b/arch/loongarch/include/uapi/asm/bitsperlong.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +#ifndef __ASM_LOONGARCH_BITSPERLONG_H
> +#define __ASM_LOONGARCH_BITSPERLONG_H
> +
> +#define __BITS_PER_LONG (__SIZEOF_LONG__ * 8)
> +
> +#include <asm-generic/bitsperlong.h>
> +
> +#endif /* __ASM_LOONGARCH_BITSPERLONG_H */
> diff --git a/arch/loongarch/include/uapi/asm/byteorder.h b/arch/loongarch/include/uapi/asm/byteorder.h
> new file mode 100644
> index 000000000000..b1722d890deb
> --- /dev/null
> +++ b/arch/loongarch/include/uapi/asm/byteorder.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
> +/*
> + * Author: Hanlu Li <lihanlu@loongson.cn>
> + *         Huacai Chen <chenhuacai@loongson.cn>
> + *
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +#ifndef _ASM_BYTEORDER_H
> +#define _ASM_BYTEORDER_H
> +
> +#include <linux/byteorder/little_endian.h>
> +
> +#endif /* _ASM_BYTEORDER_H */
> diff --git a/arch/loongarch/include/uapi/asm/reg.h b/arch/loongarch/include/uapi/asm/reg.h
> new file mode 100644
> index 000000000000..90ad910c60eb
> --- /dev/null
> +++ b/arch/loongarch/include/uapi/asm/reg.h
> @@ -0,0 +1,59 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Various register offset definitions for debuggers, core file
> + * examiners and whatnot.
> + *
> + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
> + */
> +
> +#ifndef __UAPI_ASM_LOONGARCH_REG_H
> +#define __UAPI_ASM_LOONGARCH_REG_H
> +
> +#define LOONGARCH_EF_R0		0
> +#define LOONGARCH_EF_R1		1
> +#define LOONGARCH_EF_R2		2
> +#define LOONGARCH_EF_R3		3
> +#define LOONGARCH_EF_R4		4
> +#define LOONGARCH_EF_R5		5
> +#define LOONGARCH_EF_R6		6
> +#define LOONGARCH_EF_R7		7
> +#define LOONGARCH_EF_R8		8
> +#define LOONGARCH_EF_R9		9
> +#define LOONGARCH_EF_R10	10
> +#define LOONGARCH_EF_R11	11
> +#define LOONGARCH_EF_R12	12
> +#define LOONGARCH_EF_R13	13
> +#define LOONGARCH_EF_R14	14
> +#define LOONGARCH_EF_R15	15
> +#define LOONGARCH_EF_R16	16
> +#define LOONGARCH_EF_R17	17
> +#define LOONGARCH_EF_R18	18
> +#define LOONGARCH_EF_R19	19
> +#define LOONGARCH_EF_R20	20
> +#define LOONGARCH_EF_R21	21
> +#define LOONGARCH_EF_R22	22
> +#define LOONGARCH_EF_R23	23
> +#define LOONGARCH_EF_R24	24
> +#define LOONGARCH_EF_R25	25
> +#define LOONGARCH_EF_R26	26
> +#define LOONGARCH_EF_R27	27
> +#define LOONGARCH_EF_R28	28
> +#define LOONGARCH_EF_R29	29
> +#define LOONGARCH_EF_R30	30
> +#define LOONGARCH_EF_R31	31
> +
> +/*
> + * Saved special registers
> + */
> +#define LOONGARCH_EF_ORIG_A0	32
> +#define LOONGARCH_EF_CSR_ERA	33
> +#define LOONGARCH_EF_CSR_BADV	34
> +#define LOONGARCH_EF_CSR_CRMD	35
> +#define LOONGARCH_EF_CSR_PRMD	36
> +#define LOONGARCH_EF_CSR_EUEN	37
> +#define LOONGARCH_EF_CSR_ECFG	38
> +#define LOONGARCH_EF_CSR_ESTAT	39
> +
> +#define LOONGARCH_EF_SIZE	320	/* size in bytes */
> +
> +#endif /* __UAPI_ASM_LOONGARCH_REG_H */
> diff --git a/tools/include/uapi/asm/bitsperlong.h b/tools/include/uapi/asm/bitsperlong.h
> index edba4d93e9e6..da5206517158 100644
> --- a/tools/include/uapi/asm/bitsperlong.h
> +++ b/tools/include/uapi/asm/bitsperlong.h
> @@ -17,6 +17,8 @@
>   #include "../../../arch/riscv/include/uapi/asm/bitsperlong.h"
>   #elif defined(__alpha__)
>   #include "../../../arch/alpha/include/uapi/asm/bitsperlong.h"
> +#elif defined(__loongarch__)
> +#include "../../../arch/loongarch/include/uapi/asm/bitsperlong.h"
>   #else
>   #include <asm-generic/bitsperlong.h>
>   #endif

Apart from the nit:

Reviewed-by: WANG Xuerui <git@xen0n.name>