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From: Julian Vetter To: Arnd Bergmann , Russell King , Catalin Marinas , Will Deacon , Guo Ren , Huacai Chen , WANG Xuerui , Andrew Morton , Geert Uytterhoeven , Richard Henderson , Ivan Kokshaysky , Matt Turner , "James E . J . Bottomley" , Helge Deller , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Richard Weinberger , Anton Ivanov , Johannes Berg , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Niklas Schnelle , Manivannan Sadhasivam , Miquel Raynal , Vignesh Raghavendra , Jaroslav Kysela , Takashi Iwai Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-alpha@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-um@lists.infradead.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-mtd@lists.infradead.org, linux-sound@vger.kernel.org, Yann Sionneau , Julian Vetter Subject: [PATCH v8 00/14] Consolidate IO memcpy functions Date: Tue, 8 Oct 2024 09:50:08 +0200 Message-ID: <20241008075023.3052370-1-jvetter@kalrayinc.com> X-Mailer: git-send-email 2.34.1 X-ClientProxiedBy: AM4PR07CA0019.eurprd07.prod.outlook.com (2603:10a6:205:1::32) To PAYP264MB3766.FRAP264.PROD.OUTLOOK.COM (2603:10a6:102:118::6) Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAYP264MB3766:EE_|MR1P264MB2194:EE_ X-MS-Office365-Filtering-Correlation-Id: 7803a017-ee44-43b7-3758-08dce76df3b0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|52116014|366016|921020|38350700014; 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Thank you Richard and David. I have masked the int with 0xff for alpha and parisc, and I have replaced the shift operation by the multiplication as you proposed. Thank you Johannes for your remarks on the UM arch. Finally, I have created an UM allyesconfig. I have manually disabled HAS_IOMEM and INDIRECT_IOMEM. This way I was able to identify the drivers which don't guard with 'depends on HAS_IOMEM || INDIRECT_IOMEM'. It was only a small number. I changed them and added the patches to this series (see patch 12 to 14). Thank you Niklas for your feedback. Unfortunately I was not able to simply change the prototypes of the zpci_memcpy functions because they return an int to indicate whether the pci transaction was successful. At the same time they are used as generic memcpy IO functions in the driver code. To resolve this, I implemented three wrapper functions and added defines to overwrite the default. So, on s390 we always use the fast zpci operations and don't fall back to the generic ones. Signed-off-by: Julian Vetter --- Changes for v8: - Dropped the arch/um patch that adds dummy implementations for IO memcpy functions - Added 3 new patches that fix the dependency problem for UM (added dependencies on HAS_IOMEM || INDIRECT_IOMEM) - Added new patch for s390 to internally call the zpci_memcpy functions and not the generic ones from libs/iomap_copy.c - Addressed reviewer comments and replaced 2 or 3 shifts by 'qc *= ~0UL / 0xff;' - Addressed reviewer comments on pasrisc (masking the int value) - Addressed reviewer comments on alpha (masking the int value) Changes for v7: - Added dummy implementations for memcpy_{to,from}io and memset_io on um architecture so drivers that use these functions build for um - Replaced all accesses and checks by long type - Added function prototypes as extern to asm-generic/io.h - Removed '__' from the 3 new function names - Some archs implement their own version of these IO functions with slightly different prototypes. So, I added 3 new patches to align prototypes with new ones in iomap_copy.c + io.h Changes for v6: - Added include of linux/align.h to fix build on arm arch - Replaced compile-time check by ifdef for the CONFIG_64BIT otherwise we get a warning for the 'qc << 32' for archs with 32bit int types - Suffixed arch commits by arch name Changes for v5: - Added functions to iomap_copy.c as proposed by Arndt - Removed again the new io_copy.c and related objects - Removed GENERIC_IO_COPY symbol and instead rely on the existing HAS_IOMEM symbol - Added prototypes of __memcpy_{to,from}io and __memset_io functions to asm-generic/io.h Changes for v4: - Replaced memcpy/memset in asm-generic/io.h by the new __memcpy_{to,from}io and __memset_io, so individual architectures can use it instead of using their own implementation. Changes for v3: - Replaced again 'if(IS_ENABLED(CONFIG_64BIT))' by '#ifdef CONFIG_64BIT' because on 32bit architectures (e.g., csky), __raw_{read,write}q are not defined. So, it leads to compilation errors Changes for v2: - Renamed io.c -> io_copy.c - Updated flag to 'GENERIC_IO_COPY' - Replaced pointer dereferences by 'put_unaligned()'/'get_unaligned()' - Replaced '#ifdef CONFIG_64BIT' by 'if(IS_ENABLED(CONFIG_64BIT))' - Removed '__raw_{read,write}_native' and replaced by 'if(IS_ENABLED(CONFIG_64BIT))' -> '__raw_write{l,q}' --- Julian Vetter (14): Consolidate IO memcpy/memset into iomap_copy.c arm64: Use generic IO memcpy/memset csky: Use generic IO memcpy/memset loongarch: Use generic IO memcpy/memset m68k: Align prototypes of IO memcpy/memset alpha: Align prototypes of IO memcpy/memset parisc: Align prototypes of IO memcpy/memset sh: Align prototypes of IO memcpy/memset arm: Align prototype of IO memset powerpc: Align prototypes of IO memcpy and memset s390: Add wrappers around zpci_memcpy/zpci_memset bus: mhi: ep: Add HAS_IOMEM || INDIRECT_IOMEM dependency mtd: Add HAS_IOMEM || INDIRECT_IOMEM dependency sound: Make CONFIG_SND depend on INDIRECT_IOMEM instead of UML arch/alpha/include/asm/io.h | 6 +- arch/alpha/kernel/io.c | 4 +- arch/arm/include/asm/io.h | 2 +- arch/arm64/include/asm/io.h | 11 --- arch/arm64/kernel/io.c | 87 -------------------- arch/csky/include/asm/io.h | 11 --- arch/csky/kernel/Makefile | 2 +- arch/csky/kernel/io.c | 91 --------------------- arch/loongarch/include/asm/io.h | 10 --- arch/loongarch/kernel/Makefile | 2 +- arch/loongarch/kernel/io.c | 94 --------------------- arch/m68k/include/asm/kmap.h | 8 +- arch/parisc/include/asm/io.h | 3 - arch/parisc/lib/io.c | 12 ++- arch/powerpc/include/asm/io-defs.h | 6 +- arch/powerpc/include/asm/io.h | 6 +- arch/powerpc/kernel/io.c | 6 +- arch/s390/include/asm/io.h | 27 +++++- arch/s390/include/asm/pci_io.h | 6 +- arch/sh/include/asm/io.h | 3 - arch/sh/kernel/io.c | 6 +- drivers/bus/mhi/ep/Kconfig | 1 + drivers/mtd/chips/Kconfig | 4 + drivers/mtd/lpddr/Kconfig | 1 + include/asm-generic/io.h | 58 ++----------- lib/iomap_copy.c | 127 +++++++++++++++++++++++++++++ sound/Kconfig | 2 +- 27 files changed, 197 insertions(+), 399 deletions(-) delete mode 100644 arch/csky/kernel/io.c delete mode 100644 arch/loongarch/kernel/io.c