Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754324AbaBLU5b (ORCPT ); Wed, 12 Feb 2014 15:57:31 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33141 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754316AbaBLU52 (ORCPT ); Wed, 12 Feb 2014 15:57:28 -0500 From: Mark Salter To: linux-kernel@vger.kernel.org Cc: Mark Salter , x86@kernel.org, linux-arm-kernel@lists.infradead.org, Andrew Morton , Arnd Bergmann , Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Russell King , Catalin Marinas , Will Deacon , Dave Young , Rob Herring , Leif Lindholm , patches@linaro.org Subject: [PATCH v4 0/6] generic early_ioremap support Date: Wed, 12 Feb 2014 15:56:09 -0500 Message-Id: <1392238575-10000-1-git-send-email-msalter@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch series takes the common bits from the x86 early ioremap implementation and creates a generic implementation which may be used by other architectures. The early ioremap interfaces are intended for situations where boot code needs to make temporary virtual mappings before the normal ioremap interfaces are available. Typically, this means before paging_init() has run. These patches are layered on top of generic fixmap patches which were pulled into 3.14-rc with the exception of the arm patch: https://lkml.org/lkml/2013/11/25/477 The arm fixmap patch is currently in the akpm tree and has been part of linux-next for a while. This is version 4 of the patch series. These patches (and underlying fixmap patches) may be found at: git://github.com/mosalter/linux.git (early-ioremap-v4 branch) Changes from version 3: * Removed dependency on MMU. In the case of no-MMU, the early remap functions return the address passed in. This helps simplify use of early_ioremap functions on architectures such as ARM which have optional MMU support. * Added L_PTE_XN to arm page flags so mappings are non-executable. * Include linux/io.h rather than asm/io.h in arm setup.c * Moved early_ioremap_init() before setup_machine_fdt() in arm setup_arch(). * Fixed mispelling in config EARLY_IOREMAP help text. Changes from version 2: * Added some Acks * Incorporated a patch from Dave Young to change the signature of early_memremap() (dropping __iomem from returned pointer) which is the first patch in a larger series: https://lkml.org/lkml/2013/12/22/69 This allows the change of just the x86 function signature to be bisected. Changes from version 1: * Moved the generic code into linux/mm instead of linux/lib * Have early_memremap() return normal pointer instead of __iomem This is in response to sparse warning cleanups being made in an unrelated patch series: https://lkml.org/lkml/2013/12/22/69 * Added arm64 patch to call init_mem_pgprot() earlier so that the pgprot macros are valid in time for early_ioremap use * Added validity checking for early_ioremap pgd, pud, and pmd in arm64 Dave Young (1): x86/mm: sparse warning fix for early_memremap Mark Salter (5): mm: create generic early_ioremap() support x86: use generic early_ioremap arm: add early_ioremap support arm64: initialize pgprot info earlier in boot arm64: add early_ioremap support Documentation/arm64/memory.txt | 4 +- arch/arm/Kconfig | 10 ++ arch/arm/include/asm/Kbuild | 1 + arch/arm/include/asm/fixmap.h | 20 +++ arch/arm/include/asm/io.h | 1 + arch/arm/kernel/setup.c | 2 + arch/arm/mm/Makefile | 4 + arch/arm/mm/early_ioremap.c | 93 +++++++++++++ arch/arm/mm/mmu.c | 2 + arch/arm64/Kconfig | 1 + arch/arm64/include/asm/Kbuild | 1 + arch/arm64/include/asm/fixmap.h | 67 +++++++++ arch/arm64/include/asm/io.h | 1 + arch/arm64/include/asm/memory.h | 2 +- arch/arm64/include/asm/mmu.h | 1 + arch/arm64/kernel/early_printk.c | 8 +- arch/arm64/kernel/head.S | 9 +- arch/arm64/kernel/setup.c | 4 + arch/arm64/mm/ioremap.c | 85 +++++++++++ arch/arm64/mm/mmu.c | 44 +----- arch/x86/Kconfig | 1 + arch/x86/include/asm/Kbuild | 1 + arch/x86/include/asm/fixmap.h | 6 + arch/x86/include/asm/io.h | 14 +- arch/x86/mm/ioremap.c | 224 +---------------------------- arch/x86/mm/pgtable_32.c | 2 +- include/asm-generic/early_ioremap.h | 42 ++++++ mm/Kconfig | 3 + mm/Makefile | 1 + mm/early_ioremap.c | 271 ++++++++++++++++++++++++++++++++++++ 30 files changed, 636 insertions(+), 289 deletions(-) create mode 100644 arch/arm/mm/early_ioremap.c create mode 100644 arch/arm64/include/asm/fixmap.h create mode 100644 include/asm-generic/early_ioremap.h create mode 100644 mm/early_ioremap.c -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/