platform/kernel/linux-3.10.git
16 years agox86: don't special-case pmd allocations as much
Jeremy Fitzhardinge [Wed, 30 Jan 2008 12:34:11 +0000 (13:34 +0100)]
x86: don't special-case pmd allocations as much

In x86 PAE mode, stop treating pmds as a special case.  Previously
they were always allocated and freed with the pgd.  The modifies the
code to be the same as 64-bit mode, where they are allocated on
demand.

This is a step on the way to unifying 32/64-bit pagetable allocation
as much as possible.

There is a complicating wart, however.  When you install a new
reference to a pmd in the pgd, the processor isn't guaranteed to see
it unless you reload cr3.  Since reloading cr3 also has the
side-effect of flushing the tlb, this is an expense that we want to
avoid whereever possible.

This patch simply avoids reloading cr3 unless the update is to the
current pagetable.  Later patches will optimise this further.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: William Irwin <wli@holomorphy.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: shrink some ifdefs in fault.c
Harvey Harrison [Wed, 30 Jan 2008 12:34:11 +0000 (13:34 +0100)]
x86: shrink some ifdefs in fault.c

The change from current to tsk in do_page_fault is safe as
this is set at the very beginning of the function.

Removes a likely() annotation from the 64-bit version, this
could have instead been added to 32-bit.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: ignore spurious faults
Jeremy Fitzhardinge [Wed, 30 Jan 2008 12:34:11 +0000 (13:34 +0100)]
x86: ignore spurious faults

When changing a kernel page from RO->RW, it's OK to leave stale TLB
entries around, since doing a global flush is expensive and they pose
no security problem.  They can, however, generate a spurious fault,
which we should catch and simply return from (which will have the
side-effect of reloading the TLB to the current PTE).

This can occur when running under Xen, because it frequently changes
kernel pages from RW->RO->RW to implement Xen's pagetable semantics.
It could also occur when using CONFIG_DEBUG_PAGEALLOC, since it avoids
doing a global TLB flush after changing page permissions.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: remove nx_enabled from fault.c
Harvey Harrison [Wed, 30 Jan 2008 12:34:11 +0000 (13:34 +0100)]
x86: remove nx_enabled from fault.c

On !PAE 32-bit, _PAGE_NX will be 0, making is_prefetch always
return early.  The test is sufficient on PAE as __supported_pte_mask
is updated in the same places as nx_enabled in init_32.c which also
takes disable_nx into account.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify fault_32|64.c
Harvey Harrison [Wed, 30 Jan 2008 12:34:11 +0000 (13:34 +0100)]
x86: unify fault_32|64.c

Unify includes in moved fault.c.

Modify Makefiles to pick up unified file.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify fault_32|64.c with ifdefs
Harvey Harrison [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: unify fault_32|64.c with ifdefs

Elimination of these ifdefs can be done in a unified file.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify fault_32|64.c by ifdef'd function bodies
Harvey Harrison [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: unify fault_32|64.c by ifdef'd function bodies

It's about time to get on with unifying these files, elimination
of the ugly ifdefs can occur in the unified file.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: arch/x86/mm/init_32.c printk fixes
Ingo Molnar [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: arch/x86/mm/init_32.c printk fixes

printk fixes. NOP in terms of functionality, but strings got
a bit larger due to the KERN_ markers that were added.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: arch/x86/mm/init_32.c cleanup
Ingo Molnar [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: arch/x86/mm/init_32.c cleanup

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: arch/x86/mm/init_64.c printk fixes
Ingo Molnar [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: arch/x86/mm/init_64.c printk fixes

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify ioremap
Thomas Gleixner [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: unify ioremap

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: fixes some bugs about EFI memory map handling
Huang, Ying [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: fixes some bugs about EFI memory map handling

This patch fixes some bugs of EFI memory handing code.

- On x86_64, it is possible that EFI memory map can not be mapped via
  identity map, so efi_map_memmap is removed, just use early_ioremap.

- On i386, the EFI memory map mapping take effect cross paging_init,
  so it is not necessary to use efi_map_memmap.

- EFI memory map is unmapped in efi_enter_virtual_mode to avoid
  early_ioremap leak.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: use reboot_type on EFI 32
Huang, Ying [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: use reboot_type on EFI 32

This patch makes reboot_type of BOOT_EFI is used on i386 too. Because
correpsonding reboot code of i386 and x86_64 is merged.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify page fault oops printing
Harvey Harrison [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: unify page fault oops printing

This changes the oops dumping format for page faults to
be similar between X86_32 and 64.

This is the first user of printk_address on X86_32.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: introduce show_fault_oops helper to fault_32|64.c
Harvey Harrison [Wed, 30 Jan 2008 12:34:10 +0000 (13:34 +0100)]
x86: introduce show_fault_oops helper to fault_32|64.c

This will help when unifying the oops dumping code on 32/64
bit.  No functional changes.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: add is_errata100 helper to fault_32|64.c
Harvey Harrison [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: add is_errata100 helper to fault_32|64.c

Further towards unifying these files, add another helper
in same spirit as is_errata93.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: add is_f00f_bug helper to fault_32|64.c
Harvey Harrison [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: add is_f00f_bug helper to fault_32|64.c

Further towards unifying these files, add another helper
in same spirit as is_errata93.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: make ioremap() UC by default
Ingo Molnar [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: make ioremap() UC by default

Yes! A mere 120 c_p_a() fixing and rewriting patches later,
we are now confident that we can enable UC by default for
ioremap(), on x86 too.

Every other architectures was doing this already. Doing so
makes Linux more robust against MTRR mixups (which might go
unnoticed if BIOS writers test other OSs only - where PAT
might override bad MTRRs defaults).

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa cleanup the 64-bit alias math
Thomas Gleixner [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: cpa cleanup the 64-bit alias math

Cleanup the address calculations, which are necessary to identify the
high/low alias mappings of the kernel on 64 bit machines. Instead of
calling __pa/__va back and forth, calculate the physical address once
and base the other calculations on it. Add understandable constants so
we can use the already available within() helper. Also add comments,
which help mere mortals to understand what this code does.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cpa: fix the self-test
Ingo Molnar [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: cpa: fix the self-test

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: rodata config hookup
Ingo Molnar [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: rodata config hookup

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: enable CONFIG_DEBUG_PAGEALLOC more widely
Ingo Molnar [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: enable CONFIG_DEBUG_PAGEALLOC more widely

make CONFIG_DEBUG_PAGEALLOC universally available.

CONFIG_HIBERNATION and CONFIG_HUGETLBFS was disabling it, for no
particular reason.

If there are any unfixed bugs here we'll fix it, but do not disable
vital debugging facilities like that ..

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: init memory debugging
Ingo Molnar [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: init memory debugging

debug incorrect/late access to init memory, by permanently unmapping
the init memory ranges. Depends on CONFIG_DEBUG_PAGEALLOC=y.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: move misplaced rodata check call
Arjan van de Ven [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: move misplaced rodata check call

It looks like a mismerge put the rodata self-check in the wrong spot; move
it to the right place after marking the .rodata section read only.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: fix clflush_page_range logic
Ingo Molnar [Wed, 30 Jan 2008 12:34:09 +0000 (13:34 +0100)]
x86: fix clflush_page_range logic

only present ptes must be flushed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: optimize clflush
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: optimize clflush

clflush is sufficient to be issued on one CPU. The invalidation is
broadcast throughout the coherence domain.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: clflush_page_range needs mfence
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: clflush_page_range needs mfence

clflush is an unordered operation with respect to other memory
traffic, including other CLFLUSH instructions. This needs proper
fencing with mfence.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cpa: rename global_flush_tlb() to cpa_flush_all()
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: cpa: rename global_flush_tlb() to cpa_flush_all()

The function name global_flush_tlb() suggests something different from
what the function really does. Rename it to cpa_flush_all(), which is an
understandable counterpart to cpa_flush_range().

no global visibility of the old API anymore.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cpa: implement clflush optimization
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: cpa: implement clflush optimization

Use clflush on CPUs which support this.

clflush is only used when the page attribute operation has been
successful. On CPUs which do not support clflush and in the case of
error the old fashioned global_flush_tlb() is called.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cpa use the new set_clr function
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: cpa use the new set_clr function

Convert cpa_set and cpa_clear to call the new set_clr function.
Seperate out the debug helpers.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cpa create set_and_clr function
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: cpa create set_and_clr function

Create a set_and_clr function to avoid the duplicate loops. Allows
also to do combined operations for optimization.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cpa move the flush into set and clear functions
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: cpa move the flush into set and clear functions

To avoid the modification of the flush code for the clflush
implementation, move the flush into the set and clear functions and
provide helper functions for the debugging code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: add testcases for RODATA and NX protections/attributes
Arjan van de Ven [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: add testcases for RODATA and NX protections/attributes

Latest update; I now have 4 NX tests, but 2 fail so they're #if 0'd.
I also cleaned up the NX test code quite a bit, and got rid of the ugly
exception table sorting stuff.

From: Arjan van de Ven <arjan@linux.intel.com>

This patch adds testcases for the CONFIG_DEBUG_RODATA configuration option
as well as the NX CPU feature/mappings. Both testcases can move to tests/
once that patch gets merged into mainline.
(I'm half considering moving the rodata test into mm/init.c but I'll
wait with that until init.c is unified)

As part of this I had to fix a not-quite-right alignment in the vmlinux.lds.h
for the RODATA sections, which lead to 1 page less being marked read only.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: ioremap KERN_INFO
Ingo Molnar [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: ioremap KERN_INFO

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: clean up change_page_attr_set/clear()
Thomas Gleixner [Wed, 30 Jan 2008 12:34:08 +0000 (13:34 +0100)]
x86: cpa: clean up change_page_attr_set/clear()

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: fix loop
Ingo Molnar [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: cpa: fix loop

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: fix split thinko
Thomas Gleixner [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: cpa: fix split thinko

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: make sure initmem is writable
Arjan van de Ven [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: make sure initmem is writable

When we free initmem, various rodata and CPA checks may have left
memory read only.. this patch ensures that the memory is writable
before we free it.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: fix pageattr-selftest
Arjan van de Ven [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: fix pageattr-selftest

In Ingo's testing, he found a bug in the CPA selftest code. What would
happen is that the test would call change_page_attr_addr on a range of
memory, part of which was read only, part of which was writable. The
only thing the test wanted to change was the global bit...

What actually happened was that the selftest would take the permissions
of the first page, and then the change_page_attr_addr call would then
set the permissions of the entire range to this first page. In the
rodata section case, this resulted in pages after the .rodata becoming
read only... which made the kernel rather unhappy in many interesting
ways.

This is just another example of how dangerous the cpa API is (was); this
patch changes the test to use the incremental clear/set APIs
instead, and it changes the clear/set implementation to work on a 1 page
at a time basis.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: remove flush_agp_mappings()
Ingo Molnar [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: remove flush_agp_mappings()

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: move flush to cpa
Thomas Gleixner [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: cpa: move flush to cpa

The set_memory_* and set_pages_* family of API's currently requires the
callers to do a global tlb flush after the function call; forgetting this is
a very nasty deathtrap. This patch moves the global tlb flush into
each of the callers

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: make various pageattr.c functions static
Arjan van de Ven [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: make various pageattr.c functions static

change_page_attr_add is only used in pageattr.c now, so we can
make this function static.
change_page_attr() isn't used anywere at all anymore; this function
is a really bad API anyway so just remove the bloat entirely.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: set_memory_notpresent()
Ingo Molnar [Wed, 30 Jan 2008 12:34:07 +0000 (13:34 +0100)]
x86: cpa: set_memory_notpresent()

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: convert ioremap to new API
Thomas Gleixner [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: cpa: convert ioremap to new API

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: fix ioremap API
Thomas Gleixner [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: fix ioremap API

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: fix ioremap RAM check
Thomas Gleixner [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: fix ioremap RAM check

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: fix the missing BIOS area check in page_is_ram
Thomas Gleixner [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: fix the missing BIOS area check in page_is_ram

page_is_ram has a FIXME since ages, which reminds to sanity check the
BIOS area between 640k and 1M, which is sometimes falsely reported as
RAM in the e820 tables.

Implement the sanity check. Move the BIOS range defines from
pageattr.c into e820.h to avoid duplicate defines.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: move page_is_ram() function
Thomas Gleixner [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: move page_is_ram() function

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: deprecate change_page_attr() for drivers
Arjan van de Ven [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: deprecate change_page_attr() for drivers

With the introduction of the new API, no driver or non-archcore code needs
to use c-p-a anymore, so this patch also deprecates the EXPORT_SYMBOL of CPA
(it's a horrible API after all).

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: convert CPA users to the new set_page_ API
Arjan van de Ven [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: convert CPA users to the new set_page_ API

This patch converts various users of change_page_attr() to the new,
more intent driven set_page_*/set_memory_* API set.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: a new API for drivers/etc to control cache and other page attributes
Arjan van de Ven [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: a new API for drivers/etc to control cache and other page attributes

Right now, if drivers or other code want to change, say, a cache attribute of a
page, the only API they have is change_page_attr(). c-p-a is a really bad API
for this, because it forces the caller to know *ALL* the attributes he wants
for the page, not just the 1 thing he wants to change. So code that wants to
set a page uncachable, needs to be aware of the NX status as well etc etc etc.

This patch introduces a set of new APIs for this, set_pages_<attr> and
set_memory_<attr>, that offer a logical change to the user, and leave all
attributes not implied by the requested logical change alone.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cpa: move clflush_cache_range()
Ingo Molnar [Wed, 30 Jan 2008 12:34:06 +0000 (13:34 +0100)]
x86: cpa: move clflush_cache_range()

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify ioremap_32 and _64
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: unify ioremap_32 and _64

Unify the now identical ioremap_32.c and ioremap_64.c into the
same ioremap.c file. No code changed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: unify ioremap
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: unify ioremap

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: use remove_vm_are in ioremap_32 error path
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: use remove_vm_are in ioremap_32 error path

When ioremap_page_range fails, then we can use remove_vm_area instead
of vunmap safely.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: __iomem annotations
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: __iomem annotations

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: switch to change_page_attr_addr in ioremap_32.c
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: switch to change_page_attr_addr in ioremap_32.c

Use change_page_attr_addr() instead of change_page_attr(), which
simplifies the code significantly and matches the 64bit
implementation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: make c_p_a unconditional in ioremap
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: make c_p_a unconditional in ioremap

Make c_p_a unconditional for ioremap and iounmap. This ensures
complete consistency of the flags which are handed to
ioremap_page_range and the real flags in the mappings.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: introduce max_pfn_mapped
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: introduce max_pfn_mapped

64bit uses end_pfn_map and 32bit uses max_low_pfn. There are several
files which have #ifdef'ed defines which map either to end_pfn_map or
max_low_pfn. Replace this by a universal define and clean up all the
other instances.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: cleanup ioremap includes
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: cleanup ioremap includes

Get rid of the douplicate define of ISA_START/END_ADDRESS and use the
same headers in 32 and 64 bit code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: style cleanup of ioremap code
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: style cleanup of ioremap code

Fix the coding style before going further.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: fix ioremap pgprot inconsistency
Thomas Gleixner [Wed, 30 Jan 2008 12:34:05 +0000 (13:34 +0100)]
x86: fix ioremap pgprot inconsistency

The pgprot flags which are handed into ioremap_page_range() are
different to those which are set in change_page_attr(). The
ioremap_page_range flags are executable, while the c_p_a flags are
not.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: fix ioremap pgprot inconsistency
Thomas Gleixner [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: fix ioremap pgprot inconsistency

The pgprot flags which are handed into ioremap_page_range() are
different to those which are set in change_page_attr(). The
ioremap_page_range flags are executable, while the c_p_a flags are
not. Also make the mappings global (which is a NOP currently on 32bit,
although CPUs from PPRO+ onwards support it, but that's a separate
fix.)

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
16 years agox86: turn the check_exec function into function that
Arjan van de Ven [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: turn the check_exec function into function that

What the check_exec() function really is trying to do is enforce certain
bits in the pgprot that are required by the x86 architecture, but that
callers might not be aware of (such as NX bit exclusion of the BIOS
area for BIOS based PCI access; it's not uncommon to ioremap the BIOS
region for various purposes and normally ioremap() memory has the NX bit
set).

This patch turns the check_exec() function into static_protections()
which also is now used to make sure the kernel text area remains non-NX
and that the .rodata section remains read-only. If the architecture
ends up requiring more such mandatory prot settings for specific areas,
this is now a reasonable place to add these.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: make self-test depend on DEBUG_KERNEL
Ingo Molnar [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: cpa: make self-test depend on DEBUG_KERNEL

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: ioremap_nocache fix
Huang, Ying [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: ioremap_nocache fix

This patch fixes a bug of ioremap_nocache. ioremap_nocache() will call
__ioremap() with flags != 0 to do the real work, which will call
change_page_attr_addr() if phys_addr + size - 1 < (end_pfn_map << PAGE_SHIFT).
But some pages between 0 ~ end_pfn_map << PAGE_SHIFT are not mapped by
identity map, this will make change_page_attr_addr failed.

This patch is based on latest x86 git and has been tested on x86_64 platform.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: add PAGE_KERNEL_EXEC_NOCACHE
Ingo Molnar [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: add PAGE_KERNEL_EXEC_NOCACHE

add PAGE_KERNEL_EXEC_NOCACHE.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: fix NX bit handling in change_page_attr()
Huang, Ying [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: fix NX bit handling in change_page_attr()

This patch fixes a bug of change_page_attr/change_page_attr_addr on
Intel i386/x86_64 CPUs.  After changing page attribute to be
executable with these functions, the page remains un-executable on
Intel i386/x86_64 CPU.  Because on Intel i386/x86_64 CPU, only if the
"NX" bits of all three level page tables are cleared (PAE is enabled),
the corresponding page is executable (refer to section 4.13.2 of Intel
64 and IA-32 Architectures Software Developer's Manual).  So, the bug
is fixed through clearing the "NX" bit of PMD when splitting the huge
PMD.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: change cpa to pfn based
Ingo Molnar [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: change cpa to pfn based

change CPA to pfn based.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: keep the BIOS area executable
Ingo Molnar [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: keep the BIOS area executable

keep the BIOS area executable.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: add PG_LEVEL enum
Thomas Gleixner [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: add PG_LEVEL enum

this way PG_LEVEL_1GB will be an easy change.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: clean up lookup_address() declarations
Thomas Gleixner [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: clean up lookup_address() declarations

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: clean up arch/x86/mm/pageattr.c
Ingo Molnar [Wed, 30 Jan 2008 12:34:04 +0000 (13:34 +0100)]
x86: clean up arch/x86/mm/pageattr.c

do some leftover cleanups in the now unified arch/x86/mm/pageattr.c
file.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: re-add clflush_cache_range()
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: re-add clflush_cache_range()

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify pageattr_32.c and pageattr_64.c
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: unify pageattr_32.c and pageattr_64.c

unify the now perfectly identical pageattr_32/64.c files - no code changed.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: prepare for pageattr.c unification
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: prepare for pageattr.c unification

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: backmerge 64-bit details into 32-bit pageattr.c
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: backmerge 64-bit details into 32-bit pageattr.c

backmerge 64-bit details into 32-bit pageattr.c.

the pageattr_32.c and pageattr_64.c files are now identical.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: enable DEBUG_PAGEALLOC on 64-bit
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: enable DEBUG_PAGEALLOC on 64-bit

enable CONFIG_DEBUG_PAGEALLOC=y on 64-bit kernels too.

preliminary testing shows that it's working fine.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: add kernel_map_pages() to 64-bit
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: add kernel_map_pages() to 64-bit

needed for DEBUG_PAGEALLOC support and for unification.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: return -EINVAL in __change_page_attr(), instead of 0
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: return -EINVAL in __change_page_attr(), instead of 0

careful: might change driver behavior - but this is the right
return value.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: clean up differences between 64-bit and 32-bit
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: clean up differences between 64-bit and 32-bit

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: 64-bit, add the new split_large_page() function
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: 64-bit, add the new split_large_page() function

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: 64-bit pageattr.c, prepare for unification
Ingo Molnar [Wed, 30 Jan 2008 12:34:03 +0000 (13:34 +0100)]
x86: 64-bit pageattr.c, prepare for unification

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: change 64-bit pageattr to use set_pte_atomic()
Ingo Molnar [Wed, 30 Jan 2008 12:34:02 +0000 (13:34 +0100)]
x86: change 64-bit pageattr to use set_pte_atomic()

NOP change - same as set_pte().

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: change 64-bit __change_page_attr() to struct page
Ingo Molnar [Wed, 30 Jan 2008 12:34:02 +0000 (13:34 +0100)]
x86: change 64-bit __change_page_attr() to struct page

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: simplify __change_page_attr()
Ingo Molnar [Wed, 30 Jan 2008 12:34:01 +0000 (13:34 +0100)]
x86: simplify __change_page_attr()

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: introduce native_set_pte_atomic() on 64-bit too
Ingo Molnar [Wed, 30 Jan 2008 12:34:01 +0000 (13:34 +0100)]
x86: introduce native_set_pte_atomic() on 64-bit too

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: clean up and simplify 64-bit split_large_page()
Ingo Molnar [Wed, 30 Jan 2008 12:34:00 +0000 (13:34 +0100)]
x86: clean up and simplify 64-bit split_large_page()

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: unify header part of pageattr_64.c
Ingo Molnar [Wed, 30 Jan 2008 12:34:00 +0000 (13:34 +0100)]
x86: unify header part of pageattr_64.c

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: simplify pageattr_64.c
Ingo Molnar [Wed, 30 Jan 2008 12:33:59 +0000 (13:33 +0100)]
x86: simplify pageattr_64.c

simplify pageattr_64.c.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: prepare for the unification of the cpa code
Ingo Molnar [Wed, 30 Jan 2008 12:33:59 +0000 (13:33 +0100)]
x86: prepare for the unification of the cpa code

prepare for the unification of the cpa code, by unifying the
lookup_address() logic between 32-bit and 64-bit.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: prepare for the unification of the cpa code
Ingo Molnar [Wed, 30 Jan 2008 12:33:59 +0000 (13:33 +0100)]
x86: prepare for the unification of the cpa code

prepare for the unification of the cpa code, by unifying the
lookup_address() logic between 32-bit and 64-bit.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa self-test, WARN_ON()
Ingo Molnar [Wed, 30 Jan 2008 12:33:58 +0000 (13:33 +0100)]
x86: cpa self-test, WARN_ON()

add a WARN_ON() to the cpa-self-test failure branch.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: do not PSE on CONFIG_DEBUG_PAGEALLOC=y
Ingo Molnar [Wed, 30 Jan 2008 12:33:58 +0000 (13:33 +0100)]
x86: do not PSE on CONFIG_DEBUG_PAGEALLOC=y

get more testing of the c_p_a() code done by not turning off
PSE on DEBUG_PAGEALLOC.

this simplifies the early pagetable setup code, and tests
the largepage-splitup code quite heavily.

In the end, all the largepages will be split up pretty quickly,
so there's no difference to how DEBUG_PAGEALLOC worked before.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa: simplify locking
Ingo Molnar [Wed, 30 Jan 2008 12:33:57 +0000 (13:33 +0100)]
x86: cpa: simplify locking

further simplify cpa locking: since the largepage-split is a
slowpath, use the pgd_lock for the whole operation, intead
of the mmap_sem.

This also makes it suitable for DEBUG_PAGEALLOC purposes again.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: simplify cpa largepage split, #3
Ingo Molnar [Wed, 30 Jan 2008 12:33:57 +0000 (13:33 +0100)]
x86: simplify cpa largepage split, #3

simplify cpa largepage split: push the reference protection bits
into the largepage-splitting function.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: cpa self-test fixes
Ingo Molnar [Wed, 30 Jan 2008 12:33:56 +0000 (13:33 +0100)]
x86: cpa self-test fixes

cpa self-test fixes. change_page_attr_addr() was buggy, it
passed in a virtual address as a physical one.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: further cpa largepage-split cleanups
Ingo Molnar [Wed, 30 Jan 2008 12:33:56 +0000 (13:33 +0100)]
x86: further cpa largepage-split cleanups

further cpa largepage-split cleanups: make the splitup isolated
functionality, without leaking details back into __change_page_attr().

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: simplify 32-bit cpa largepage splitting
Ingo Molnar [Wed, 30 Jan 2008 12:33:55 +0000 (13:33 +0100)]
x86: simplify 32-bit cpa largepage splitting

simplify 32-bit cpa largepage splitting: do a pure split and repeat
the pte lookup to get the new pte modified.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
16 years agox86: simplify the 32-bit cpa code
Ingo Molnar [Wed, 30 Jan 2008 12:33:55 +0000 (13:33 +0100)]
x86: simplify the 32-bit cpa code

simplify the 32-bit cpa code.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>