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From: Julian Vetter To: Arnd Bergmann , Catalin Marinas , Will Deacon , Guo Ren , Huacai Chen , WANG Xuerui , Andrew Morton , Geert Uytterhoeven , Richard Henderson , Niklas Schnelle , Takashi Iwai , Miquel Raynal , David Laight , Johannes Berg , Christoph Hellwig Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-arch@vger.kernel.org, Yann Sionneau , Julian Vetter Subject: [PATCH v11 1/4] New implementation for IO memcpy and IO memset Date: Mon, 28 Oct 2024 14:42:24 +0100 Message-ID: <20241028134227.4020894-2-jvetter@kalrayinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241028134227.4020894-1-jvetter@kalrayinc.com> References: <20241028134227.4020894-1-jvetter@kalrayinc.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: AS4P195CA0037.EURP195.PROD.OUTLOOK.COM (2603:10a6:20b:65a::26) To PAYP264MB3766.FRAP264.PROD.OUTLOOK.COM (2603:10a6:102:118::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAYP264MB3766:EE_|PAZP264MB2397:EE_ X-MS-Office365-Filtering-Correlation-Id: 7056dcfd-b3dc-4d88-68a1-08dcf7566520 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|52116014|376014|7416014|366016|38350700014|921020; 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charset="utf-8" The IO memcpy and IO memset functions in asm-generic/io.h simply call memcpy and memset. This can lead to alignment problems or faults on architectures that do not define their own version and fall back to these defaults. This patch introduces new implementations for IO memcpy and IO memset, that use read{l,q} accessor functions, align accesses to machine word size, and resort to byte accesses when the target memory is not aligned. For new architectures and existing ones that were using the old fallbacks these functions are save to use, because IO memory constraints are taken into account. Moreover, architectures with similar implementations can now use these new versions, not needing to implement their own. Reviewed-by: Yann Sionneau Signed-off-by: Julian Vetter --- Changes for v11: - Updated asm-generic/io.h to just contain the changes suggested by Arnd - Restored iomem_copy.c - Re-ordered functions to match the order in asm-generic/io.h - Aligned variable names (e.g., src and dst instead of to and from) with the ones from asm-generic/io.h --- include/asm-generic/io.h | 22 +------ lib/Makefile | 2 +- lib/iomem_copy.c | 136 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 140 insertions(+), 20 deletions(-) create mode 100644 lib/iomem_copy.c diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index 80de699bf6af..7004c2e5e8f1 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -1151,7 +1151,6 @@ static inline void unxlate_dev_mem_ptr(phys_addr_t ph= ys, void *addr) #endif =20 #ifndef memset_io -#define memset_io memset_io /** * memset_io Set a range of I/O memory to a constant value * @addr: The beginning of the I/O-memory range to set @@ -1160,15 +1159,10 @@ static inline void unxlate_dev_mem_ptr(phys_addr_t = phys, void *addr) * * Set a range of I/O memory to a given value. */ -static inline void memset_io(volatile void __iomem *addr, int value, - size_t size) -{ - memset(__io_virt(addr), value, size); -} +void memset_io(volatile void __iomem *addr, int val, size_t count); #endif =20 #ifndef memcpy_fromio -#define memcpy_fromio memcpy_fromio /** * memcpy_fromio Copy a block of data from I/O memory * @dst: The (RAM) destination for the copy @@ -1177,16 +1171,10 @@ static inline void memset_io(volatile void __iomem = *addr, int value, * * Copy a block of data from I/O memory. */ -static inline void memcpy_fromio(void *buffer, - const volatile void __iomem *addr, - size_t size) -{ - memcpy(buffer, __io_virt(addr), size); -} +void memcpy_fromio(void *dst, const volatile void __iomem *src, size_t cou= nt); #endif =20 #ifndef memcpy_toio -#define memcpy_toio memcpy_toio /** * memcpy_toio Copy a block of data into I/O memory * @dst: The (I/O memory) destination for the copy @@ -1195,11 +1183,7 @@ static inline void memcpy_fromio(void *buffer, * * Copy a block of data to I/O memory. */ -static inline void memcpy_toio(volatile void __iomem *addr, const void *bu= ffer, - size_t size) -{ - memcpy(__io_virt(addr), buffer, size); -} +void memcpy_toio(volatile void __iomem *dst, const void *src, size_t count= ); #endif =20 extern int devmem_is_allowed(unsigned long pfn); diff --git a/lib/Makefile b/lib/Makefile index 773adf88af41..db4717538fad 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -35,7 +35,7 @@ lib-y :=3D ctype.o string.o vsprintf.o cmdline.o \ is_single_threaded.o plist.o decompress.o kobject_uevent.o \ earlycpio.o seq_buf.o siphash.o dec_and_lock.o \ nmi_backtrace.o win_minmax.o memcat_p.o \ - buildid.o objpool.o union_find.o + buildid.o objpool.o union_find.o iomem_copy.o =20 lib-$(CONFIG_PRINTK) +=3D dump_stack.o lib-$(CONFIG_SMP) +=3D cpumask.o diff --git a/lib/iomem_copy.c b/lib/iomem_copy.c new file mode 100644 index 000000000000..24c2b59a0ad2 --- /dev/null +++ b/lib/iomem_copy.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2024 Kalray, Inc. All Rights Reserved. + */ + +#include +#include +#include +#include +#include + +#ifndef memset_io +/** + * memset_io Set a range of I/O memory to a constant value + * @addr: The beginning of the I/O-memory range to set + * @val: The value to set the memory to + * @count: The number of bytes to set + * + * Set a range of I/O memory to a given value. + */ +void memset_io(volatile void __iomem *addr, int val, size_t count) +{ + long qc =3D (u8)val; + + qc *=3D ~0UL / 0xff; + + while (count && !IS_ALIGNED((long)addr, sizeof(long))) { + __raw_writeb(val, addr); + addr++; + count--; + } + + while (count >=3D sizeof(long)) { +#ifdef CONFIG_64BIT + __raw_writeq(qc, addr); +#else + __raw_writel(qc, addr); +#endif + + addr +=3D sizeof(long); + count -=3D sizeof(long); + } + + while (count) { + __raw_writeb(val, addr); + addr++; + count--; + } +} +EXPORT_SYMBOL(memset_io); +#endif + +#ifndef memcpy_fromio +/** + * memcpy_fromio Copy a block of data from I/O memory + * @dst: The (RAM) destination for the copy + * @src: The (I/O memory) source for the data + * @count: The number of bytes to copy + * + * Copy a block of data from I/O memory. + */ +void memcpy_fromio(void *dst, const volatile void __iomem *src, size_t cou= nt) +{ + while (count && !IS_ALIGNED((long)src, sizeof(long))) { + *(u8 *)dst =3D __raw_readb(src); 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charset="utf-8" Use the new fallback memcpy_{from,to}io and memset_io functions from lib/iomem_copy.c on the arm64 processor architecture. Reviewed-by: Catalin Marinas Reviewed-by: Yann Sionneau Signed-off-by: Julian Vetter --- Changes for v11: - Updated commit message --- arch/arm64/include/asm/io.h | 11 ----- arch/arm64/kernel/io.c | 87 ------------------------------------- 2 files changed, 98 deletions(-) diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 1ada23a6ec19..463067bffdfd 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -128,17 +128,6 @@ static __always_inline u64 __raw_readq(const volatile = void __iomem *addr) #define IO_SPACE_LIMIT (PCI_IO_SIZE - 1) #define PCI_IOBASE ((void __iomem *)PCI_IO_START) =20 -/* - * String version of I/O memory access operations. - */ -extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t); -extern void __memcpy_toio(volatile void __iomem *, const void *, size_t); -extern void __memset_io(volatile void __iomem *, int, size_t); - -#define memset_io(c,v,l) __memset_io((c),(v),(l)) -#define memcpy_fromio(a,c,l) __memcpy_fromio((a),(c),(l)) -#define memcpy_toio(c,a,l) __memcpy_toio((c),(a),(l)) - /* * The ARM64 iowrite implementation is intended to support drivers that wa= nt to * use write combining. For instance PCI drivers using write combining wit= h a 64 diff --git a/arch/arm64/kernel/io.c b/arch/arm64/kernel/io.c index ef48089fbfe1..fe86ada23c7d 100644 --- a/arch/arm64/kernel/io.c +++ b/arch/arm64/kernel/io.c @@ -9,34 +9,6 @@ #include #include =20 -/* - * Copy data from IO memory space to "real" memory space. - */ -void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t c= ount) -{ - while (count && !IS_ALIGNED((unsigned long)from, 8)) { - *(u8 *)to =3D __raw_readb(from); - from++; - to++; - count--; - } - - while (count >=3D 8) { - *(u64 *)to =3D __raw_readq(from); - from +=3D 8; - to +=3D 8; - count -=3D 8; - } - - while (count) { - *(u8 *)to =3D __raw_readb(from); - from++; - to++; - count--; - } -} -EXPORT_SYMBOL(__memcpy_fromio); - /* * This generates a memcpy that works on a from/to address which is aligne= d to * bits. Count is in terms of the number of bits sized quantities to copy.= It @@ -78,62 +50,3 @@ void __iowrite32_copy_full(void __iomem *to, const void = *from, size_t count) dgh(); } EXPORT_SYMBOL(__iowrite32_copy_full); - -/* - * Copy data from "real" memory space to IO memory space. - */ -void __memcpy_toio(volatile void __iomem *to, const void *from, size_t cou= nt) -{ - while (count && !IS_ALIGNED((unsigned long)to, 8)) { - __raw_writeb(*(u8 *)from, to); - from++; - to++; - count--; - } - - while (count >=3D 8) { - __raw_writeq(*(u64 *)from, to); - from +=3D 8; - to +=3D 8; - count -=3D 8; - } - - while (count) { - __raw_writeb(*(u8 *)from, to); - from++; - to++; - count--; - } -} -EXPORT_SYMBOL(__memcpy_toio); - -/* - * "memset" on IO memory space. - */ -void __memset_io(volatile void __iomem *dst, int c, size_t count) -{ - u64 qc =3D (u8)c; - - qc |=3D qc << 8; - qc |=3D qc << 16; - qc |=3D qc << 32; - - while (count && !IS_ALIGNED((unsigned long)dst, 8)) { - __raw_writeb(c, dst); - dst++; 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charset="utf-8" Use the new fallback memcpy_{from,to}io and memset_io functions from lib/iomem_copy.c on the csky processor architecture. Acked-by: Guo Ren Reviewed-by: Yann Sionneau Signed-off-by: Julian Vetter --- Changes for v11: - Updated commit message --- arch/csky/include/asm/io.h | 11 ----- arch/csky/kernel/Makefile | 2 +- arch/csky/kernel/io.c | 91 -------------------------------------- 3 files changed, 1 insertion(+), 103 deletions(-) delete mode 100644 arch/csky/kernel/io.c diff --git a/arch/csky/include/asm/io.h b/arch/csky/include/asm/io.h index 4725bb977b0f..ed53f0b47388 100644 --- a/arch/csky/include/asm/io.h +++ b/arch/csky/include/asm/io.h @@ -31,17 +31,6 @@ #define writel(v,c) ({ wmb(); writel_relaxed((v),(c)); mb(); }) #endif =20 -/* - * String version of I/O memory access operations. - */ -extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t); -extern void __memcpy_toio(volatile void __iomem *, const void *, size_t); -extern void __memset_io(volatile void __iomem *, int, size_t); - -#define memset_io(c,v,l) __memset_io((c),(v),(l)) -#define memcpy_fromio(a,c,l) __memcpy_fromio((a),(c),(l)) -#define memcpy_toio(c,a,l) __memcpy_toio((c),(a),(l)) - /* * I/O memory mapping functions. */ diff --git a/arch/csky/kernel/Makefile b/arch/csky/kernel/Makefile index 8a868316b912..de1c3472e8f0 100644 --- a/arch/csky/kernel/Makefile +++ b/arch/csky/kernel/Makefile @@ -2,7 +2,7 @@ extra-y :=3D vmlinux.lds =20 obj-y +=3D head.o entry.o atomic.o signal.o traps.o irq.o time.o vdso.o vd= so/ -obj-y +=3D power.o syscall.o syscall_table.o setup.o io.o +obj-y +=3D power.o syscall.o syscall_table.o setup.o obj-y +=3D process.o cpu-probe.o ptrace.o stacktrace.o obj-y +=3D probes/ =20 diff --git a/arch/csky/kernel/io.c b/arch/csky/kernel/io.c deleted file mode 100644 index 5883f13fa2b1..000000000000 --- a/arch/csky/kernel/io.c +++ /dev/null @@ -1,91 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -#include -#include -#include - -/* - * Copy data from IO memory space to "real" memory space. - */ -void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t c= ount) -{ - while (count && !IS_ALIGNED((unsigned long)from, 4)) { - *(u8 *)to =3D __raw_readb(from); 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charset="utf-8" Use the new fallback memcpy_{from,to}io and memset_io functions from lib/iomem_copy.c on the loongarch processor architecture. Reviewed-by: Yann Sionneau Signed-off-by: Julian Vetter --- Changes for v11: - Updated commit message --- arch/loongarch/include/asm/io.h | 10 ---- arch/loongarch/kernel/Makefile | 2 +- arch/loongarch/kernel/io.c | 94 --------------------------------- 3 files changed, 1 insertion(+), 105 deletions(-) delete mode 100644 arch/loongarch/kernel/io.c diff --git a/arch/loongarch/include/asm/io.h b/arch/loongarch/include/asm/i= o.h index 5e95a60df180..e77a56eaf906 100644 --- a/arch/loongarch/include/asm/io.h +++ b/arch/loongarch/include/asm/io.h @@ -62,16 +62,6 @@ static inline void __iomem *ioremap_prot(phys_addr_t off= set, unsigned long size, =20 #define mmiowb() wmb() =20 -/* - * String version of I/O memory access operations. - */ -extern void __memset_io(volatile void __iomem *dst, int c, size_t count); -extern void __memcpy_toio(volatile void __iomem *to, const void *from, siz= e_t count); -extern void __memcpy_fromio(void *to, const volatile void __iomem *from, s= ize_t count); -#define memset_io(c, v, l) __memset_io((c), (v), (l)) -#define memcpy_fromio(a, c, l) __memcpy_fromio((a), (c), (l)) -#define memcpy_toio(c, a, l) __memcpy_toio((c), (a), (l)) - #define __io_aw() mmiowb() =20 #ifdef CONFIG_KFENCE diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile index c9bfeda89e40..9497968ee158 100644 --- a/arch/loongarch/kernel/Makefile +++ b/arch/loongarch/kernel/Makefile @@ -8,7 +8,7 @@ OBJECT_FILES_NON_STANDARD_head.o :=3D y extra-y :=3D vmlinux.lds =20 obj-y +=3D head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \ - traps.o irq.o idle.o process.o dma.o mem.o io.o reset.o switch.o \ + traps.o irq.o idle.o process.o dma.o mem.o reset.o switch.o \ elf.o syscall.o signal.o time.o topology.o inst.o ptrace.o vdso.o \ alternative.o unwind.o =20 diff --git a/arch/loongarch/kernel/io.c b/arch/loongarch/kernel/io.c deleted file mode 100644 index cb85bda5a6ad..000000000000 --- a/arch/loongarch/kernel/io.c +++ /dev/null @@ -1,94 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2020-2022 Loongson Technology Corporation Limited - */ -#include -#include -#include - -/* - * Copy data from IO memory space to "real" memory space. - */ -void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t c= ount) -{ - while (count && !IS_ALIGNED((unsigned long)from, 8)) { - *(u8 *)to =3D __raw_readb(from); - from++; - to++; - count--; - } - - while (count >=3D 8) { - *(u64 *)to =3D __raw_readq(from); - from +=3D 8; - to +=3D 8; - count -=3D 8; - } - - while (count) { - *(u8 *)to =3D __raw_readb(from); - from++; - to++; - count--; - } -} -EXPORT_SYMBOL(__memcpy_fromio); - -/* - * Copy data from "real" memory space to IO memory space. - */ -void __memcpy_toio(volatile void __iomem *to, const void *from, size_t cou= nt) -{ - while (count && !IS_ALIGNED((unsigned long)to, 8)) { - __raw_writeb(*(u8 *)from, to); - from++; - to++; - count--; - } - - while (count >=3D 8) { - __raw_writeq(*(u64 *)from, to); - from +=3D 8; - to +=3D 8; - count -=3D 8; - } - - while (count) { - __raw_writeb(*(u8 *)from, to); - from++; - to++; - count--; - } -} -EXPORT_SYMBOL(__memcpy_toio); - -/* - * "memset" on IO memory space. - */ -void __memset_io(volatile void __iomem *dst, int c, size_t count) -{ - u64 qc =3D (u8)c; - - qc |=3D qc << 8; - qc |=3D qc << 16; - qc |=3D qc << 32; - - while (count && !IS_ALIGNED((unsigned long)dst, 8)) { - __raw_writeb(c, dst); - dst++; - count--; - } - - while (count >=3D 8) { - __raw_writeq(qc, dst); - dst +=3D 8; - count -=3D 8; - } - - while (count) { - __raw_writeb(c, dst); - dst++; - count--; - } -} -EXPORT_SYMBOL(__memset_io); --=20 2.34.1