- 26 Sep, 2006 40 commits
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Rafael J. Wysocki authored
Hack uart_suspend_port() and uart_resume_port() so that serial console ports are not suspended if CONFIG_DISABLE_CONSOLE_SUSPEND is set. This makes it possible to debug the suspend and resume routines of all device drivers as well as the lowest-level swsusp code with the help of the serial console. Signed-off-by:
Rafael J. Wysocki <rjw@sisk.pl> Acked-by:
Pavel Machek <pavel@ucw.cz> Signed-off-by:
Andrew Morton <akpm@osdl.org> Signed-off-by:
Linus Torvalds <torvalds@osdl.org>
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Rafael J. Wysocki authored
Change suspend_console() so that it waits for all consoles to flush the remaining messages and make it possible to switch the console suspending off with the help of a Kconfig option. Signed-off-by:
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Rafael J. Wysocki authored
Make swsusp use memory bitmaps to store its internal information during the resume phase of the suspend-resume cycle. If the pfns of saveable pages are saved during the suspend phase instead of the kernel virtual addresses of these pages, we can use them during the resume phase directly to set the corresponding bits in a memory bitmap. Then, this bitmap is used to mark the page frames corresponding to the pages that were saveable before the suspend (aka "unsafe" page frames). Next, we allocate as many page frames as needed to store the entire suspend image and make sure that there will be some extra free "safe" page frames for the list of PBEs constructed later. Subsequently, the image is loaded and, if possible, the data loaded from it are written into their "original" page frames (ie. the ones they had occupied before the suspend). The image data that cannot be written into their "original" page frames are loaded into "safe" page frames and their "original" kernel virtual addresses, as well as the addresses of the "safe" pages containing their copies, are stored in a list of PBEs. Finally, the list of PBEs is used to copy the remaining image data into their "original" page frames (this is done atomically, by the architecture-dependent parts of swsusp). Signed-off-by:
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Rafael J. Wysocki authored
Introduce the memory bitmap data structure and make swsusp use in the suspend phase. The current swsusp's internal data structure is not very efficient from the memory usage point of view, so it seems reasonable to replace it with a data structure that will require less memory, such as a pair of bitmaps. The idea is to use bitmaps that may be allocated as sets of individual pages, so that we can avoid making allocations of order greater than 0. For this reason the memory bitmap structure consists of several linked lists of objects that contain pointers to memory pages with the actual bitmap data. Still, for a typical system all of these lists fit in a single page, so it's reasonable to introduce an additional mechanism allowing us to allocate all of them efficiently without sacrificing the generality of the design. This is done with the help of the chain_allocator structure and associated functions. We need to use two memory bitmaps during the suspend phase of the suspend-resume cycle. One of them is necessary for marking the saveable pages, and the second is used to mark the pages in which to store the copies of them (aka image pages). First, the bitmaps are created and we allocate as many image pages as needed (the corresponding bits in the second bitmap are set as soon as the pages are allocated). Second, the bits corresponding to the saveable pages are set in the first bitmap and the saveable pages are copied to the image pages. Finally, the first bitmap is used to save the kernel virtual addresses of the saveable pages and the second one is used to save the contents of the image pages. Signed-off-by:
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Rafael J. Wysocki authored
Introduce some constants that hopefully will help improve the readability of code in kernel/power/snapshot.c. Signed-off-by:
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Rafael J. Wysocki authored
The name of the pagedir_nosave variable does not make sense any more, so it seems reasonable to change it to something more meaningful. Signed-off-by:
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Rafael J. Wysocki authored
Remove some things that are no longer used or defined elsewhere from suspend.h and make the inline version of software_suspend() return the right error code. Signed-off-by:
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Rafael J. Wysocki authored
Get rid of the FIXME in kernel/power/snapshot.c#alloc_pagedir() and simplify the functions called by it. Signed-off-by:
Pavel Machek <pavel@suse.cz> Signed-off-by:
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Rafael J. Wysocki authored
Move some functions in kernel/power/snapshot.c to a better place (in the same file) and introduce free_image_page() (will be necessary in the future). Signed-off-by:
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Rafael J. Wysocki authored
Clean up mm/page_alloc.c#mark_free_pages() and make it avoid clearing PageNosaveFree for PageNosave pages. This allows us to get rid of an ugly hack in kernel/power/snapshot.c#copy_data_pages(). Additionally, the page-copying loop in copy_data_pages() is moved to an inline function. Signed-off-by:
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Rafael J. Wysocki authored
The current suspend code has to be run on one CPU, so we use the CPU hotplug to take the non-boot CPUs offline on SMP machines. However, we should also make sure that these CPUs will not be enabled by someone else after we have disabled them. The functions disable_nonboot_cpus() and enable_nonboot_cpus() are moved to kernel/cpu.c, because they now refer to some stuff in there that should better be static. Also it's better if disable_nonboot_cpus() returns an error instead of panicking if something goes wrong, and enable_nonboot_cpus() has no reason to panic(), because the CPUs may have been enabled by the userland before it tries to take them online. Signed-off-by:
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Rafael J. Wysocki authored
On x86_64 machines with more than 2 GB of RAM there are large memory gaps (with no corresponding kernel virtual addresses) and reserved memory regions between areas of usable physical RAM. Moreover, if CONFIG_FLATMEM is set, they appear within the normal zone. swsusp should not try to save them, so the corresponding page structs have to be marked as 'nosave'. Signed-off-by:
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Rafael J. Wysocki authored
Add comments describing struct snapshot_handle and its members, change the confusing name of its member 'page' to 'cur'. Signed-off-by:
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Rafael J. Wysocki authored
Clean up some loops over pfns for each zone in snapshot.c: reduce the number of additions to perform, rework detection of saveable pages and make the code a bit less difficult to understand, hopefully. Signed-off-by:
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Andrew Morton authored
Implement async reads for swsusp resuming. Crufty old PIII testbox: 15.7 MB/s -> 20.3 MB/s Sony Vaio: 14.6 MB/s -> 33.3 MB/s I didn't implement the post-resume bio_set_pages_dirty(). I don't really understand why resume needs to run set_page_dirty() against these pages. It might be a worry that this code modifies PG_Uptodate, PG_Error and PG_Locked against the image pages. Can this possibly affect the resumed-into kernel? Hopefully not, if we're atomically restoring its mem_map? Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Jens Axboe <axboe@suse.de> Cc: Laurent Riffard <laurent.riffard@free.fr> Signed-off-by:
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Andrew Morton authored
Add some instrumentation to the swsusp readin code to show what bandwidth we're achieving. Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by:
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Andrew Morton authored
Switch the swsusp writeout code from 4k-at-a-time to 4MB-at-a-time. Crufty old PIII testbox: 12.9 MB/s -> 20.9 MB/s Sony Vaio: 14.7 MB/s -> 26.5 MB/s The implementation is crude. A better one would use larger BIOs, but wouldn't gain any performance. The memcpys will be mostly pipelined with the IO and basically come for free. The ENOMEM path has not been tested. It should be. Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by:
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Andrew Morton authored
Add some instrumentation to the swsusp writeout code to show what bandwidth we're achieving. Cc: Pavel Machek <pavel@ucw.cz> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by:
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Steven Whitehouse authored
Add the DIV_ROUND_UP() helper macro: divide `n' by `d', rounding up. Stolen from the gfs2 tree(!) because the swsusp patches need it. Signed-off-by:
Steven Whitehouse <swhiteho@redhat.com> Signed-off-by:
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Fernando J. Pereda authored
There appears to be a typo in the EV56 config option. NORITAKE and PRIMO are be able to set a variation of either. Signed-off-by:
Daniel Drake <dsd@gentoo.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by:
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Josh Triplett authored
The functions prepare_set and post_set in kernel/cpu/mtrr/generic.c wrap the spinlock set_atomicity_lock: prepare_set returns with the lock held, and post_set releases the lock without acquiring it. Add lock annotations to these two functions so that sparse can check callers for lock pairing, and so that sparse will not complain about these functions since they intentionally use locks in this manner. Signed-off-by:
Josh Triplett <josh@freedesktop.org> Signed-off-by:
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john stultz authored
Remove all references to xtime in i386 and replace them w/ get/set_timeofday(). Requires some ugly and uncertain changes to APM, but has been lightly tested to work. Signed-off-by:
John Stultz <johnstul@us.ibm.com> Acked-by:
Ingo Molnar <mingo@elte.hu> Acked-by:
Mikael Pettersson <mikpe@it.uu.se> Signed-off-by:
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Alan Cox authored
Voyager fiddles with current->signal.tty without locking. It turns out that the code in question has already cleared current->signal.tty correctly because daemonize() does the right thing already. The signal handling also appears to be incorrect as it does an unprotected sigfillset that also appears unneccessary. As I don't have a bowtie and am therefore not a qualified voyager maintainer I leave that to James. Signed-off-by:
Alan Cox <alan@redhat.com> Acked-by:
James Bottomley <James.Bottomley@steeleye.com> Signed-off-by:
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Andrew Morton authored
If we're going to implement smp_call_function_single() on three architecture with the same prototype then it should have a declaration in a non-arch-specific header file. Move it into <linux/smp.h>. Cc: Stephane Eranian <eranian@hpl.hp.com> Signed-off-by:
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Stephane Eranian authored
Continiung the series of small patches necessary for the perfmon subsystem, here is a patch that adds support for the smp_call_function_single() function for i386. It exists for almost all other architectures but i386. The perfmon subsystem needs it in one case to free some state on a designated remote CPU. Signed-off-by:
Stephane Eranian <eranian@hpl.hp.com> Signed-off-by:
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Rusty Russell authored
Remove unnecessary include from efi_stub.S Signed-off-by:
Zachary Amsden <zach@vmware.com> Signed-off-by:
Rusty Russell <rusty@rustcorp.com.au> Signed-off-by:
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Rusty Russell authored
Move ptep_set_access_flags to be closer to the other ptep accessors, and make the indentation standard. Signed-off-by:
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Rusty Russell authored
Move the __HAVE_ARCH_PTEP defines to accompany the function definitions. Anything else is just a complete nightmare to track through the 2/3-level paging code, and this caused duplicate definitions to be needed (pte_same), which could have easily been taken care of with the asm-generic pgtable functions. Signed-off-by:
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Rusty Russell authored
Parsing generic pgtable.h in assembler is simply crazy. None of this file is needed in assembler code, and C inline functions and structures routine break one or more different compiles. Signed-off-by:
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Dave Hansen authored
The current VMSPLIT Kconfig option is disabled whenever highmem is on. This is a bit screwy because the people who need to change VMSPLIT the most tend to be the ones with highmem and constrained lowmem. So, remove the highmem dependency. But, re-include the dependency for the "full 1GB of lowmem" option. You can't have the full 1GB of lowmem and highmem because of the need for the vmalloc(), kmap(), etc... areas. I thought there would be at least a bit of tweaking to do to get it to work, but everything seems OK. Boot tested on a 4GB x86 machine, and a 12GB 3-node NUMA-Q: elm3b82:~# cat /proc/meminfo MemTotal: 3695412 kB MemFree: 3659540 kB ... LowTotal: 2909008 kB LowFree: 2892324 kB ... elm3b82:~# zgrep PAE /proc/config.gz CONFIG_X86_PAE=y larry:~# cat /proc/meminfo MemTotal: 11845900 kB MemFree: 11786748 kB ... LowTotal: 2855180 kB LowFree: 2830092 kB Signed-off-by:
Dave Hansen <haveblue@us.ibm.com> Signed-off-by:
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Ian Campbell authored
I've come across some problems with the assembly version of the ELFNOTE macro currently in -mm. (in x86-put-note-sections-into-a-pt_note-segment-in-vmlinux.patch) The first is that older gas does not support :varargs in .macro definitions (in my testing 2.17 does while 2.15 does not, I don't know when it became supported). The Changes file says binutils >= 2.12 so I think we need to avoid using it. There are no other uses in mainline or -mm. Old gas appears to just ignore it so you get "too many arguments" type errors. Secondly it seems that passing strings as arguments to assembler macros is broken without varargs. It looks like they get unquoted or each character is treated as a separate argument or something and this causes all manner of grief. I think this is because of the use of -traditional when compiling assembly files. Therefore I have translated the assembler macro into a pre-processor macro. I added the desctype as a separate argument instead of including it with the descdata as the previous version did since -traditional means the ELFNOTE definition after the #else needs to have the same number of arguments (I think so anyway, the -traditional CPP semantics are pretty fscking strange!). With this patch I am able to define elfnotes in assembly like this with both old and new assemblers. ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz, "linux") ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz, "2.6") ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz, "xen-3.0") ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, .long, __PAGE_OFFSET) Which seems reasonable enough. Signed-off-by:
Ian Campbell <ian.campbell@xensource.com> Acked-by:
Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by:
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Jeremy Fitzhardinge authored
This patch will pack any .note.* section into a PT_NOTE segment in the output file. To do this, we tell ld that we need a PT_NOTE segment. This requires us to start explicitly mapping sections to segments, so we also need to explicitly create PT_LOAD segments for text and data, and map the sections to them appropriately. Fortunately, each section will default to its previous section's segment, so it doesn't take many changes to vmlinux.lds.S. This only changes i386 for now, but I presume the corresponding changes for other architectures will be as simple. This change also adds <linux/elfnote.h>, which defines C and Assembler macros for actually creating ELF notes. Signed-off-by:
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Zachary Amsden authored
Add a boot parameter to reserve high linear address space for hypervisors. This is necessary to allow dynamically loaded hypervisor modules, which might not happen until userspace is already running, and also provides a useful tool to benchmark the performance impact of reduced lowmem address space. Signed-off-by:
Chris Wright <chrisw@sous-sol.org> Signed-off-by:
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Jeremy Fitzhardinge authored
Make __FIXADDR_TOP a variable, so that it can be set to not get in the way of address space a hypervisor may want to reserve. Original patch by Gerd Hoffmann <kraxel@suse.de> Signed-off-by:
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Rusty Russell authored
It's a little neater, and also means only one place to patch for paravirtualization. Signed-off-by:
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Chris Wright authored
Add "always lock'd" implementations of set_bit, clear_bit and change_bit and the corresponding test_and_ functions. Also add "always lock'd" implementation of cmpxchg. These give guaranteed strong synchronisation and are required for non-SMP kernels running on an SMP hypervisor. Signed-off-by:
Ian Pratt <ian.pratt@xensource.com> Signed-off-by:
Christian Limpach <Christian.Limpach@cl.cam.ac.uk> Signed-off-by:
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Rusty Russell authored
arch/i386/kernel/reboot.c defines its own struct to describe an ldt entry: it should use struct Xgt_desc_struct (currently load_ldt is a macro, so doesn't complain: paravirt patches make it warn). Signed-off-by:
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Neil Horman authored
Clean up module initalization for apm.c. I had started by auditing for proper return code checks in misc_register, but I found that in the event of an initalization failure, a proc file and a kernel thread were left hanging out. this patch properly cleans up those loose ends on any initalization failure. Signed-off-by:
Neil Horman <nhorman@tuxdriver.com> Acked-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Rolf Eike Beer authored
Signed-off-by:
Rolf Eike Beer <eike-kernel@sf-tec.de> Signed-off-by:
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Chuck Ebbert authored
show_registers() tries to dump failing code starting 43 bytes before the offending instruction, but this address can be bad, for example in a device driver where the failing instruction is less than 43 bytes from the start of the driver's code. When that happens, try to dump code starting at the failing instruction instead of printing no code at all. Signed-off-by:
Chuck Ebbert <76306.1226@compuserve.com> Cc: Andi Kleen <ak@muc.de> Cc: Keith Owens <kaos@ocs.com.au> Signed-off-by:
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