kernel.git/arch/arm64/include/asm/io.h, branch linux-4.9.y

arm64/io: Allow I/O writes to use {W,X}ZR

2016-09-08T10:04:13Z

When zeroing an I/O location, the current accessors are forced to allocate a temporary register to store the zero for the write. By tweaking the assembly constraints, we can allow the compiler to use the zero register directly in such cases, and save some juggling. Compiling a representative kernel configuration with GCC 6 shows that 2.3KB worth of code can be wasted just on that! text data bss dec hex filename 13316776 3248256 18176769 34741801 2121e29 vmlinux.o.new 13319140 3248256 18176769 34744165 2122765 vmlinux.o.old Acked-by: Mark Rutland Signed-off-by: Robin Murphy Signed-off-by: Will Deacon

arm64: Drop generic xlate_dev_mem_{k,}ptr()

2016-09-05T09:23:56Z

The code that provides /dev/mem uses xlate_dev_mem_{k,}ptr() to avoid making a cachable mapping of a non-cachable area on ia64. On arm64 we do this via phys_mem_access_prot() instead, but provide dummy versions of xlate_dev_mem_{k,}ptr(). These are the same as those in asm-generic/io.h, which we include from asm/io.h Signed-off-by: James Morse Signed-off-by: Will Deacon

arm64: add io{read,write}64be accessors

2016-05-31T08:41:51Z

This will allow device drivers to consistently use io{read,write}XXbe also for 64-bit accesses. Acked-by: Catalin Marinas Signed-off-by: Alex Porosanu Signed-off-by: Horia Geantă Signed-off-by: Herbert Xu

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

2015-06-24T17:02:15Z

Pull arm64 updates from Catalin Marinas: "Mostly refactoring/clean-up: - CPU ops and PSCI (Power State Coordination Interface) refactoring following the merging of the arm64 ACPI support, together with handling of Trusted (secure) OS instances - Using fixmap for permanent FDT mapping, removing the initial dtb placement requirements (within 512MB from the start of the kernel image). This required moving the FDT self reservation out of the memreserve processing - Idmap (1:1 mapping used for MMU on/off) handling clean-up - Removing flush_cache_all() - not safe on ARM unless the MMU is off. Last stages of CPU power down/up are handled by firmware already - "Alternatives" (run-time code patching) refactoring and support for immediate branch patching, GICv3 CPU interface access - User faults handling clean-up And some fixes: - Fix for VDSO building with broken ELF toolchains - Fix another case of init_mm.pgd usage for user mappings (during ASID roll-over broadcasting) - Fix for FPSIMD reloading after CPU hotplug - Fix for missing syscall trace exit - Workaround for .inst asm bug - Compat fix for switching the user tls tpidr_el0 register" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (42 commits) arm64: use private ratelimit state along with show_unhandled_signals arm64: show unhandled SP/PC alignment faults arm64: vdso: work-around broken ELF toolchains in Makefile arm64: kernel: rename __cpu_suspend to keep it aligned with arm arm64: compat: print compat_sp instead of sp arm64: mm: Fix freeing of the wrong memmap entries with !SPARSEMEM_VMEMMAP arm64: entry: fix context tracking for el0_sp_pc arm64: defconfig: enable memtest arm64: mm: remove reference to tlb.S from comment block arm64: Do not attempt to use init_mm in reset_context() arm64: KVM: Switch vgic save/restore to alternative_insn arm64: alternative: Introduce feature for GICv3 CPU interface arm64: psci: fix !CONFIG_HOTPLUG_CPU build warning arm64: fix bug for reloading FPSIMD state after CPU hotplug. arm64: kernel thread don't need to save fpsimd context. arm64: fix missing syscall trace exit arm64: alternative: Work around .inst assembler bugs arm64: alternative: Merge alternative-asm.h into alternative.h arm64: alternative: Allow immediate branch as alternative instruction arm64: Rework alternate sequence for ARM erratum 845719 ...

arch/*/io.h: Add ioremap_wt() to all architectures

2015-06-07T13:28:57Z

Add ioremap_wt() to all arch-specific asm/io.h headers which define ioremap_wc() locally. These headers do not include . Some of them include , but ioremap_wt() is defined for consistency since they define all ioremap_xxx locally. In all architectures without Write-Through support, ioremap_wt() is defined indentical to ioremap_nocache(). frv and m68k already have ioremap_writethrough(). On those we add ioremap_wt() indetical to ioremap_writethrough() and defines ARCH_HAS_IOREMAP_WT in both architectures. The ioremap_wt() interface is exported to drivers. Signed-off-by: Toshi Kani Signed-off-by: Borislav Petkov Cc: Andrew Morton Cc: Andy Lutomirski Cc: Elliott@hp.com Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Luis R. Rodriguez Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: arnd@arndb.de Cc: hch@lst.de Cc: hmh@hmh.eng.br Cc: jgross@suse.com Cc: konrad.wilk@oracle.com Cc: linux-mm Cc: linux-nvdimm@lists.01.org Cc: stefan.bader@canonical.com Cc: yigal@plexistor.com Link: http://lkml.kernel.org/r/1433436928-31903-9-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar

arm64: Rename temp variable in read*_relaxed()

2015-05-19T14:27:42Z

This resolves the following sparse warning from readl() and other macros, which ends up embedding readl_relaxed() using the same variable. Warning log: include/asm-generic/io.h:364:16: warning: symbol '__v' shadows an earlier one include/asm-generic/io.h:364:16: originally declared here include/asm-generic/io.h:372:16: warning: symbol '__v' shadows an earlier one include/asm-generic/io.h:372:16: originally declared here include/asm-generic/io.h:380:16: warning: symbol '__v' shadows an earlier one include/asm-generic/io.h:380:16: originally declared here include/asm-generic/io.h:568:16: warning: symbol '__v' shadows an earlier one include/asm-generic/io.h:568:16: originally declared here include/asm-generic/io.h:576:16: warning: symbol '__v' shadows an earlier one include/asm-generic/io.h:576:16: originally declared here include/asm-generic/io.h:584:16: warning: symbol '__v' shadows an earlier one include/asm-generic/io.h:584:16: originally declared here The same patch was already applied to arm32 as "ARM: 7118/1: rename temp variable in read*_relaxed()" (sha1: b0c1264f534a1cb3c52036a23a04d238434a0df6) Acked-by: Liviu Dudau Signed-off-by: Michal Simek Signed-off-by: Catalin Marinas

arm64: Fix overlapping VA allocations

2015-01-23T14:13:14Z

PCI IO space was intended to be 16MiB, at 32MiB below MODULES_VADDR, but commit d1e6dc91b532d3d3 ("arm64: Add architectural support for PCI") extended this to cover the full 32MiB. The final 8KiB of this 32MiB is also allocated for the fixmap, allowing for potential clashes between the two. This change was masked by assumptions in mem_init and the page table dumping code, which assumed the I/O space to be 16MiB long through seaparte hard-coded definitions. This patch changes the definition of the PCI I/O space allocation to live in asm/memory.h, along with the other VA space allocations. As the fixmap allocation depends on the number of fixmap entries, this is moved below the PCI I/O space allocation. Both the fixmap and PCI I/O space are guarded with 2MB of padding. Sites assuming the I/O space was 16MiB are moved over use new PCI_IO_{START,END} definitions, which will keep in sync with the size of the IO space (now restored to 16MiB). As a useful side effect, the use of the new PCI_IO_{START,END} definitions prevents a build issue in the dumping code due to a (now redundant) missing include of io.h for PCI_IOBASE. Signed-off-by: Mark Rutland Cc: Kees Cook Cc: Laura Abbott Cc: Liviu Dudau Cc: Steve Capper Cc: Will Deacon [catalin.marinas@arm.com: reorder FIXADDR and PCI_IO address_markers_idx enum] Signed-off-by: Catalin Marinas

Merge tag 'asm-generic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

2014-12-10T01:25:00Z

Pull asm-generic asm/io.h rewrite from Arnd Bergmann: "While there normally is no reason to have a pull request for asm-generic but have all changes get merged through whichever tree needs them, I do have a series for 3.19. There are two sets of patches that change significant portions of asm/io.h, and this branch contains both in order to resolve the conflicts: - Will Deacon has done a set of patches to ensure that all architectures define {read,write}{b,w,l,q}_relaxed() functions or get them by including asm-generic/io.h. These functions are commonly used on ARM specific drivers to avoid expensive L2 cache synchronization implied by the normal {read,write}{b,w,l,q}, but we need to define them on all architectures in order to share the drivers across architectures and to enable CONFIG_COMPILE_TEST configurations for them - Thierry Reding has done an unrelated set of patches that extends the asm-generic/io.h file to the degree necessary to make it useful on ARM64 and potentially other architectures" * tag 'asm-generic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (29 commits) ARM64: use GENERIC_PCI_IOMAP sparc: io: remove duplicate relaxed accessors on sparc32 ARM: sa11x0: Use void __iomem * in MMIO accessors arm64: Use include/asm-generic/io.h ARM: Use include/asm-generic/io.h asm-generic/io.h: Implement generic {read,write}s*() asm-generic/io.h: Reconcile I/O accessor overrides /dev/mem: Use more consistent data types Change xlate_dev_{kmem,mem}_ptr() prototypes ARM: ixp4xx: Properly override I/O accessors ARM: ixp4xx: Fix build with IXP4XX_INDIRECT_PCI ARM: ebsa110: Properly override I/O accessors ARC: Remove redundant PCI_IOBASE declaration documentation: memory-barriers: clarify relaxed io accessor semantics x86: io: implement dummy relaxed accessor macros for writes tile: io: implement dummy relaxed accessor macros for writes sparc: io: implement dummy relaxed accessor macros for writes powerpc: io: implement dummy relaxed accessor macros for writes parisc: io: implement dummy relaxed accessor macros for writes mn10300: io: implement dummy relaxed accessor macros for writes ...

arm64: add Cortex-A57 erratum 832075 workaround

2014-11-25T15:56:42Z

The ARM erratum 832075 applies to certain revisions of Cortex-A57, one of the workarounds is to change device loads into using load-aquire semantics. This is achieved using the alternatives framework. Signed-off-by: Andre Przywara Signed-off-by: Will Deacon

arm64: Use include/asm-generic/io.h

2014-11-10T14:59:23Z

Include the generic I/O header file so that duplicate implementations can be removed. This will also help to establish consistency across more architectures regarding which accessors they support. Acked-by: Catalin Marinas Signed-off-by: Thierry Reding