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Miller" , Eric Dumazet , Gerald Schaefer , Vasily Gorbik , Heiko Carstens , "H. Peter Anvin" , Justin Stitt , Jakub Kicinski , Leon Romanovsky , linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, llvm@lists.linux.dev, Ingo Molnar , Bill Wendling , Nathan Chancellor , Nick Desaulniers , netdev@vger.kernel.org, Paolo Abeni , Salil Mehta , Sven Schnelle , Thomas Gleixner , x86@kernel.org, Yisen Zhuang Cc: Arnd Bergmann , Catalin Marinas , Leon Romanovsky , linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Mark Rutland , Michael Guralnik , patches@lists.linux.dev, Niklas Schnelle , Jijie Shao , Will Deacon Subject: [PATCH v3 1/6] x86: Stop using weak symbols for __iowrite32_copy() Date: Thu, 11 Apr 2024 13:46:14 -0300 Message-ID: <1-v3-1893cd8b9369+1925-mlx5_arm_wc_jgg@nvidia.com> In-Reply-To: <0-v3-1893cd8b9369+1925-mlx5_arm_wc_jgg@nvidia.com> References: X-ClientProxiedBy: MN2PR07CA0026.namprd07.prod.outlook.com (2603:10b6:208:1a0::36) To DM6PR12MB3849.namprd12.prod.outlook.com (2603:10b6:5:1c7::26) Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6PR12MB3849:EE_|SJ2PR12MB8064:EE_ X-MS-Office365-Filtering-Correlation-Id: f32dd621-6a5c-425c-9cc4-08dc5a46eace X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR12MB3849.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(1800799015)(376005)(7416005)(366007)(921011);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: f32dd621-6a5c-425c-9cc4-08dc5a46eace X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3849.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Apr 2024 16:46:21.4794 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: kdCiKkIt5BwwTn8c2VYAXmiqGIPWwW6B1wLC+j+bGnFl+i34PF2akqQepPwAn50Y X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8064 Start switching iomap_copy routines over to use #define and arch provided inline/macro functions instead of weak symbols. Inline functions allow more compiler optimization and this is often a driver hot path. x86 has the only weak implementation for __iowrite32_copy(), so replace it with a static inline containing the same single instruction inline assembly. The compiler will generate the "mov edx,ecx" in a more optimal way. Remove iomap_copy_64.S Signed-off-by: Jason Gunthorpe Acked-by: Arnd Bergmann --- arch/x86/include/asm/io.h | 17 +++++++++++++++++ arch/x86/lib/Makefile | 1 - arch/x86/lib/iomap_copy_64.S | 15 --------------- include/linux/io.h | 5 ++++- lib/iomap_copy.c | 6 +++--- 5 files changed, 24 insertions(+), 20 deletions(-) delete mode 100644 arch/x86/lib/iomap_copy_64.S diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 294cd2a4081812..4b99ed326b1748 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -209,6 +209,23 @@ void memset_io(volatile void __iomem *, int, size_t); #define memcpy_toio memcpy_toio #define memset_io memset_io +#ifdef CONFIG_X86_64 +/* + * Commit 0f07496144c2 ("[PATCH] Add faster __iowrite32_copy routine for + * x86_64") says that circa 2006 rep movsl is noticeably faster than a copy + * loop. + */ +static inline void __iowrite32_copy(void __iomem *to, const void *from, + size_t count) +{ + asm volatile("rep ; movsl" + : "=&c"(count), "=&D"(to), "=&S"(from) + : "0"(count), "1"(to), "2"(from) + : "memory"); +} +#define __iowrite32_copy __iowrite32_copy +#endif + /* * ISA space is 'always mapped' on a typical x86 system, no need to * explicitly ioremap() it. The fact that the ISA IO space is mapped diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile index 6da73513f02668..98583a9dbab337 100644 --- a/arch/x86/lib/Makefile +++ b/arch/x86/lib/Makefile @@ -53,7 +53,6 @@ ifneq ($(CONFIG_X86_CMPXCHG64),y) lib-y += atomic64_386_32.o endif else - obj-y += iomap_copy_64.o ifneq ($(CONFIG_GENERIC_CSUM),y) lib-y += csum-partial_64.o csum-copy_64.o csum-wrappers_64.o endif diff --git a/arch/x86/lib/iomap_copy_64.S b/arch/x86/lib/iomap_copy_64.S deleted file mode 100644 index 6ff2f56cb0f71a..00000000000000 --- a/arch/x86/lib/iomap_copy_64.S +++ /dev/null @@ -1,15 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ -/* - * Copyright 2006 PathScale, Inc. All Rights Reserved. - */ - -#include - -/* - * override generic version in lib/iomap_copy.c - */ -SYM_FUNC_START(__iowrite32_copy) - movl %edx,%ecx - rep movsl - RET -SYM_FUNC_END(__iowrite32_copy) diff --git a/include/linux/io.h b/include/linux/io.h index 235ba7d80a8f0d..ce86120ce9d526 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -16,7 +16,10 @@ struct device; struct resource; -__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); +#ifndef __iowrite32_copy +void __iowrite32_copy(void __iomem *to, const void *from, size_t count); +#endif + void __ioread32_copy(void *to, const void __iomem *from, size_t count); void __iowrite64_copy(void __iomem *to, const void *from, size_t count); diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c index 5de7c04e05ef56..8ddcbb53507dfe 100644 --- a/lib/iomap_copy.c +++ b/lib/iomap_copy.c @@ -16,9 +16,8 @@ * time. Order of access is not guaranteed, nor is a memory barrier * performed afterwards. */ -void __attribute__((weak)) __iowrite32_copy(void __iomem *to, - const void *from, - size_t count) +#ifndef __iowrite32_copy +void __iowrite32_copy(void __iomem *to, const void *from, size_t count) { u32 __iomem *dst = to; const u32 *src = from; @@ -28,6 +27,7 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to, __raw_writel(*src++, dst++); } EXPORT_SYMBOL_GPL(__iowrite32_copy); +#endif /** * __ioread32_copy - copy data from MMIO space, in 32-bit units