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2010-03-06memory-hotplug: create /sys/firmware/memmap entry for new memoryakpm@linux-foundation.org
A memmap is a directory in sysfs which includes 3 text files: start, end and type. For example: start: 0x100000 end: 0x7e7b1cff type: System RAM Interface firmware_map_add was not called explicitly. Remove it and add function firmware_map_add_hotplug as hotplug interface of memmap. Each memory entry has a memmap in sysfs, When we hot-add new memory, sysfs does not export memmap entry for it. We add a call in function add_memory to function firmware_map_add_hotplug. Add a new function add_sysfs_fw_map_entry() to create memmap entry, it will be called when initialize memmap and hot-add memory. [akpm@linux-foundation.org: un-kernedoc a no longer kerneldoc comment] Signed-off-by: Shaohui Zheng <shaohui.zheng@intel.com> Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Yasunori Goto <y-goto@jp.fujitsu.com> Reviewed-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-16firmware_map: fix hang with x86/32bitYinghai Lu
Addresses http://bugzilla.kernel.org/show_bug.cgi?id=13484 Peer reported: | The bug is introduced from kernel 2.6.27, if E820 table reserve the memory | above 4G in 32bit OS(BIOS-e820: 00000000fff80000 - 0000000120000000 | (reserved)), system will report Int 6 error and hang up. The bug is caused by | the following code in drivers/firmware/memmap.c, the resource_size_t is 32bit | variable in 32bit OS, the BUG_ON() will be invoked to result in the Int 6 | error. I try the latest 32bit Ubuntu and Fedora distributions, all hit this | bug. |====== |static int firmware_map_add_entry(resource_size_t start, resource_size_t end, | const char *type, | struct firmware_map_entry *entry) and it only happen with CONFIG_PHYS_ADDR_T_64BIT is not set. it turns out we need to pass u64 instead of resource_size_t for that. [akpm@linux-foundation.org: add comment] Reported-and-tested-by: Peer Chen <pchen@nvidia.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: H. Peter Anvin <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-18Bernhard has movedBernhard Walle
Since I don't work for SUSE any more and the bwalle@suse.de address is invalid, correct it in the copyright headers and documentation. Signed-off-by: Bernhard Walle <bernhard.walle@gmx.de> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-08-12firmware/memmap: cleanupBernhard Walle
Various cleanup the drivers/firmware/memmap (after review by AKPM): - fix kdoc to conform to the standard - move kdoc from header to implementation files - remove superfluous WARN_ON() after kmalloc() - WARN_ON(x); if (!x) -> if(!WARN_ON(x)) - improve some comments Signed-off-by: Bernhard Walle <bwalle@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-08sysfs: add /sys/firmware/memmapBernhard Walle
This patch adds /sys/firmware/memmap interface that represents the BIOS (or Firmware) provided memory map. The tree looks like: /sys/firmware/memmap/0/start (hex number) end (hex number) type (string) ... /1/start end type With the following shell snippet one can print the memory map in the same form the kernel prints itself when booting on x86 (the E820 map). --------- 8< -------------------------- #!/bin/sh cd /sys/firmware/memmap for dir in * ; do start=$(cat $dir/start) end=$(cat $dir/end) type=$(cat $dir/type) printf "%016x-%016x (%s)\n" $start $[ $end +1] "$type" done --------- >8 -------------------------- That patch only provides the needed interface: 1. The sysfs interface. 2. The structure and enumeration definition. 3. The function firmware_map_add() and firmware_map_add_early() that should be called from architecture code (E820/EFI, for example) to add the contents to the interface. If the kernel is compiled without CONFIG_FIRMWARE_MEMMAP, the interface does nothing without cluttering the architecture-specific code with #ifdef's. The purpose of the new interface is kexec: While /proc/iomem represents the *used* memory map (e.g. modified via kernel parameters like 'memmap' and 'mem'), the /sys/firmware/memmap tree represents the unmodified memory map provided via the firmware. So kexec can: - use the original memory map for rebooting, - use the /proc/iomem for setting up the ELF core headers for kdump case that should only represent the memory of the system. The patch has been tested on i386 and x86_64. Signed-off-by: Bernhard Walle <bwalle@suse.de> Acked-by: Greg KH <gregkh@suse.de> Acked-by: Vivek Goyal <vgoyal@redhat.com> Cc: kexec@lists.infradead.org Cc: yhlu.kernel@gmail.com Signed-off-by: Ingo Molnar <mingo@elte.hu>