2024 Early_ioremap

Early_ioremap_reset

Author: mnwx

August undefined, 2024

WebThe 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 discussed here ... WebOct 16, 2012 · I have a working version of the driver, but it's currently very slow. So, I've gone back a few steps and tried making a small, simple driver to recreate the problem. I reserve the memory at boot time using the kernel parameter memmap=2G$1G. Then, in the driver's __init function, I ioremap some of this memory, and initialize it to a known value.

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WebWithout this call, >> invocations of early_ioremap etc. that are done too late will go >> unnoticed and may cause corruption. >> >> This is exactly what happened when the first user of this feature >> was added in patch f84d02755f5a ("arm64: add EFI runtime … WebThe early mapping of the EFI memory map is unmapped during an early initcall, at which time the early ioremap support is long gone. Fix by adding the missing call to early_ioremap_reset() to setup_arch(), and move the offending early_memunmap() to … the nutcracker prince internet

ioremap() and memremap() [LWN.net]

WebOct 25, 2024 · As ARM32 is using the generic early ioremap code this just calls early_ioremap_setup() in mm/early_ioremap.c. This makes it possible to use early calls to ioremap() . As noted we have defined for NR_FIX_BTMAPS which we use to … WebLike ioremap(), but explicitly requests non-posted write semantics. On some architectures and buses, ioremap() mappings have posted write semantics, which means that writes can appear to “complete” from the point of view of the CPU before the written data actually arrives at the target device. Writes are still ordered with respect to other ... the nutcracker prince vhs

mm/early_ioremap.c - kernel/common - Git at Google

kernel_xiaomi_alioth/early_ioremap.h at v20240314-01_4.19.277

WebJan 12, 2015 · Commit 0e63ea48b4d8 (arm64/efi: add missing call to early_ioremap_reset()) added a missing call to early_ioremap_reset(). This triggers a BUG if code tries using early_ioremap() after the early_ioremap_reset(). This is a problem for some ACPI code which needs short-lived temporary mappings after paging_init() but … Web[prev in list] [next in list] [prev in thread] [next in thread] List: linux-mm Subject: Re: [PATCH 1/1] mm/early_ioremap.c: remove redundant early_ioremap_shutdown() From: David Hildenbrand Date: 2024-09-01 10:11:04 Message-ID: 7ca43a9f-b62d-26df-0b9c-1cfa2f7dc611 redhat ! com [Download RAW message or body] ... michigan small business taxWeb* Provide common bits of early_ioremap() support for architectures needing * temporary mappings during boot before ioremap() is available. * This is mostly a direct copy of the x86 early_ioremap implementation. the nutcracker prince online

"WebMar 14, 2024 · extern void early_ioremap_setup (void); /* * Called as last step in paging_init() so library can act * accordingly for subsequent map/unmap requests. */ extern void early_ioremap_reset (void); /* * Early copy from unmapped memory to kernel mapped memory. */ extern void copy_from_early_mem (void * dest, phys_addr_t src, unsigned … " - Early_ioremap_reset

Early_ioremap_reset

[PATCH v4 2/6] mm: create generic early_ioremap() support

WebThe initial usage is to support the large graphics aperture on 32-bit processors where ioremap_wc cannot be used to statically map the entire aperture to the CPU as it would consume too much of the kernel address space. A mapping object is created during … WebAug 16, 2016 · 2 Answers. gcc is searching for asm/early_ioremap.h which is not available in Linux 4.4.15. any idea how can i fix this? I think you've answered your own question; either you figure out where the functionality contained in that header file has moved, or …

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WebAug 29, 2009 · I too get this warning message. My "hardware" is a qemu 0.9.1-1ubuntu1 virtual machine, and the kernel is Linux ubuntu 2.6.30-8-generic #9-Ubuntu SMP Wed Jun 3 15:23:55 UTC 2009 i686 GNU/Linux from the live cd of Kubuntu 9.10 karmic alpha 2 … Webextern void early_ioremap_setup (void); /* * Called as last step in paging_init() so library can act * accordingly for subsequent map/unmap requests. */ extern void early_ioremap_reset (void); /* * Early copy from unmapped memory to kernel mapped memory. */ extern void copy_from_early_mem (void * dest, phys_addr_t src, unsigned …

Web/* * Provide common bits of early_ioremap() support for architectures needing * temporary mappings during boot before ioremap() is available. * * This is mostly a direct copy of the x86 early_ioremap implementation. ... void __init early_ioremap_reset(void) { early_ioremap_shutdown(); after_paging_init = 1; } /* * Generally, ioremap() is ... WebThe early mapping of the EFI memory map is unmapped during an early: initcall, at which time the early ioremap support is long gone. Fix by adding the missing call to early_ioremap_reset to: setup_arch (), and move the offending early_memunmap to right after: the point where the early mapping of the EFI memory map is last used.

WebMar 4, 2024 · /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_EARLY_IOREMAP_H_ #define _ASM_EARLY_IOREMAP_H_ #include /* * early_ioremap() and early_iounmap() are for temporary early boot-time * mappings, before the real … WebThis patch creates a generic implementation of early_ioremap() support based on the existing x86 implementation. early_ioremp() is useful for early boot code which needs to temporarily map I/O or memory regions

Web* Provide common bits of early_ioremap() support for architectures needing * temporary mappings during boot before ioremap() is available. * This is mostly a direct copy of the x86 early_ioremap implementation.

WebThis triggers a BUG if code tries using early_ioremap() after the early_ioremap_reset(). This is a problem for some ACPI code which needs short-lived temporary mappings after paging_init() but before mm_init(). the nutcracker pyotr ilyich tchWebSep 18, 2015 · On Fri, Sep 18, 2015 at 03:14:26PM +0100, Mark Salter wrote: > Currently, DMI initialization takes place in a core initcall. This > limits how early in boot the kernel can make DMI-based decisions > about firmware/hardware quirks. This patch moves DMI initialization > to setup_arch() so that DMI info is available before initcalls run. Which … michigan small business restart programWeb// SPDX-License-Identifier: GPL-2.0-only /* * Re-map IO memory to kernel address space so that we can access it. * This is needed for high PCI addresses that aren't mapped in the michigan small business searchWebKernel.org Bugzilla – Bug 121421 Broadwell / Z97 - Early ioremap leak of 1 areas detected Last modified: 2016-08-04 03:20:05 UTC michigan small business startup grantsWeb+ bool "Provide early_ioremap() support for kernel initialization." + select GENERIC_EARLY_IOREMAP + help + Provide a mechanism for kernel initialisation code to temporarily + map, in a highmem-agnostic way, memory pages in before ioremap() + and friends are available (before paging_init() has run). It uses michigan small claims court proceduresWebLKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH v3 0/6] generic early_ioremap support @ 2014-01-10 3:50 Mark Salter 2014-01-10 3:50 ` [PATCH v3 1/6] x86/mm: sparse warning fix for early_memremap Mark Salter ` (5 more replies) 0 siblings, 6 replies; 18+ messages in thread From: Mark Salter @ 2014-01-10 3:50 UTC (permalink / … the nutcracker pyotr ilyich tchaikovsky songWebearly_ioremap_reset at an appropriate time. Without this call, invocations of early_ioremap etc. that are done too late will go: unnoticed and may cause corruption. This is exactly what happened when the first user of this feature: was added in patch f84d02755f5a ("arm64: … michigan small claims affidavit of claim form