kernel/include/asm-generic/io.h, branch linux-5.11.y

Add and use a generic version of devmem_is_allowed()

2020-12-11T20:30:26Z

As part of adding STRICT_DEVMEM support to the RISC-V port, Zong provided an implementation of devmem_is_allowed() that's exactly the same as the version in a handful of other ports. Rather than duplicate code, I've put a generic version of this in lib/ and used it for the RISC-V port. * palmer/generic-devmem: arm64: Use the generic devmem_is_allowed() arm: Use the generic devmem_is_allowed() RISC-V: Use the new generic devmem_is_allowed() lib: Add a generic version of devmem_is_allowed()

lib: Add a generic version of devmem_is_allowed()

2020-12-11T20:28:08Z

As part of adding support for STRICT_DEVMEM to the RISC-V port, Zong provided a devmem_is_allowed() implementation that's exactly the same as all the others I checked. Instead I'm adding a generic version, which will soon be used. Reviewed-by: Luis Chamberlain Signed-off-by: Palmer Dabbelt

asm-generic/io.h: Fix !CONFIG_GENERIC_IOMAP pci_iounmap() implementation

2020-10-05T08:44:16Z

For arches that do not select CONFIG_GENERIC_IOMAP, the current pci_iounmap() function does nothing causing obvious memory leaks for mapped regions that are backed by MMIO physical space. In order to detect if a mapped pointer is IO vs MMIO, a check must made available to the pci_iounmap() function so that it can actually detect whether the pointer has to be unmapped. In configurations where CONFIG_HAS_IOPORT_MAP && !CONFIG_GENERIC_IOMAP, a mapped port is detected using an ioport_map() stub defined in asm-generic/io.h. Use the same logic to implement a stub (ie __pci_ioport_unmap()) that detects if the passed in pointer in pci_iounmap() is IO vs MMIO to iounmap conditionally and call it in pci_iounmap() fixing the issue. Leave __pci_ioport_unmap() as a NOP for all other config options. Tested-by: George Cherian Link: https://lore.kernel.org/lkml/20200905024811.74701-1-yangyingliang@huawei.com Link: https://lore.kernel.org/lkml/20200824132046.3114383-1-george.cherian@marvell.com Link: https://lore.kernel.org/r/a9daf8d8444d0ebd00bc6d64e336ec49dbb50784.1600254147.git.lorenzo.pieralisi@arm.com Reported-by: George Cherian Signed-off-by: Lorenzo Pieralisi Signed-off-by: Lorenzo Pieralisi Reviewed-by: Catalin Marinas Cc: Arnd Bergmann Cc: George Cherian Cc: Will Deacon Cc: Bjorn Helgaas Cc: Catalin Marinas Cc: Yang Yingliang

asm-generic/io.h: Fix sparse warnings on big-endian architectures

2020-08-04T03:52:23Z

On big-endian architectures like OpenRISC, sparse outputs below warnings on asm-generic/io.h. This is due to io statements like: __raw_writel(cpu_to_le32(value), PCI_IOBASE + addr); The __raw_writel() function expects native endianness, however cpu_to_le32() returns __le32. On little-endian machines these match up and there is no issue. However, on big-endian we get warnings, for IO that is defined as little-endian the mismatch is expected. The fix I propose is to __force to native endian. Warnings: ./include/asm-generic/io.h:166:15: warning: cast to restricted __le16 ./include/asm-generic/io.h:166:15: warning: cast to restricted __le16 ./include/asm-generic/io.h:166:15: warning: cast to restricted __le16 ./include/asm-generic/io.h:166:15: warning: cast to restricted __le16 ./include/asm-generic/io.h:179:15: warning: cast to restricted __le32 ./include/asm-generic/io.h:179:15: warning: cast to restricted __le32 ./include/asm-generic/io.h:179:15: warning: cast to restricted __le32 ./include/asm-generic/io.h:179:15: warning: cast to restricted __le32 ./include/asm-generic/io.h:179:15: warning: cast to restricted __le32 ./include/asm-generic/io.h:179:15: warning: cast to restricted __le32 ./include/asm-generic/io.h:215:22: warning: incorrect type in argument 1 (different base types) ./include/asm-generic/io.h:215:22: expected unsigned short [usertype] value ./include/asm-generic/io.h:215:22: got restricted __le16 [usertype] ./include/asm-generic/io.h:225:22: warning: incorrect type in argument 1 (different base types) ./include/asm-generic/io.h:225:22: expected unsigned int [usertype] value ./include/asm-generic/io.h:225:22: got restricted __le32 [usertype] Signed-off-by: Stafford Horne Acked-by: Arnd Bergmann

io: Fix return type of _inb and _inl

2020-07-27T08:32:29Z

The return type of functions _inb, _inw and _inl are all u16 which looks wrong. This patch makes them u8, u16 and u32 respectively. The original commit text for these does not indicate that these should be all forced to u16. Fixes: f009c89df79a ("io: Provide _inX() and _outX()") Signed-off-by: Stafford Horne Reviewed-by: John Garry Signed-off-by: Arnd Bergmann

mm: introduce include/linux/pgtable.h

2020-06-09T16:39:13Z

The include/linux/pgtable.h is going to be the home of generic page table manipulation functions. Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and make the latter include asm/pgtable.h. Signed-off-by: Mike Rapoport Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brian Cain Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Guan Xuetao Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ley Foon Tan Cc: Mark Salter Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Nick Hu Cc: Paul Walmsley Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Tony Luck Cc: Vincent Chen Cc: Vineet Gupta Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org Signed-off-by: Linus Torvalds

io: Provide _inX() and _outX()

2020-05-07T06:54:18Z

Since commit a7851aa54c0c ("io: change outX() to have their own IO barrier overrides") and commit 87fe2d543f81 ("io: change inX() to have their own IO barrier overrides"), the outX and inX functions have memory barriers which can be overridden. However, the generic logic_pio lib has continued to use readl/writel et al for IO port accesses, which has weaker barriers on arm64. Provide generic _inX() and _outX(), which can be used by logic pio. For consistency, we check for !defined({in,out}X) && !defined(_{in,out}X), for defining _{in,out}X, while a check for just !defined({in,out}X) should suffice. Reviewed-by: Arnd Bergmann Signed-off-by: John Garry Signed-off-by: Wei Xu

remove ioremap_nocache and devm_ioremap_nocache

2020-01-06T08:45:59Z

ioremap has provided non-cached semantics by default since the Linux 2.6 days, so remove the additional ioremap_nocache interface. Signed-off-by: Christoph Hellwig Acked-by: Arnd Bergmann

lib: provide a simple generic ioremap implementation

2019-11-11T20:18:20Z

A lot of architectures reuse the same simple ioremap implementation, so start lifting the most simple variant to lib/ioremap.c. It provides ioremap_prot and iounmap, plus a default ioremap that uses prot_noncached, although that can be overridden by asm/io.h. Signed-off-by: Christoph Hellwig Reviewed-by: Arnd Bergmann Reviewed-by: Palmer Dabbelt

arch: rely on asm-generic/io.h for default ioremap_* definitions

2019-11-11T20:18:19Z

Various architectures that use asm-generic/io.h still defined their own default versions of ioremap_nocache, ioremap_wt and ioremap_wc that point back to plain ioremap directly or indirectly. Remove these definitions and rely on asm-generic/io.h instead. For this to work the backup ioremap_* defintions needs to be changed to purely cpp macros instea of inlines to cover for architectures like openrisc that only define ioremap after including . Signed-off-by: Christoph Hellwig Reviewed-by: Arnd Bergmann Reviewed-by: Palmer Dabbelt