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2008-01-30x86: convert CPA users to the new set_page_ APIArjan van de Ven
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>
2008-01-30x86: a new API for drivers/etc to control cache and other page attributesArjan van de Ven
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>
2008-01-30x86: cpa: move clflush_cache_range()Ingo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: unify ioremap_32 and _64Thomas Gleixner
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>
2008-01-30x86: unify ioremapThomas Gleixner
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: use remove_vm_are in ioremap_32 error pathThomas Gleixner
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>
2008-01-30x86: __iomem annotationsThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-01-30x86: switch to change_page_attr_addr in ioremap_32.cThomas Gleixner
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>
2008-01-30x86: make c_p_a unconditional in ioremapThomas Gleixner
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>
2008-01-30x86: introduce max_pfn_mappedThomas Gleixner
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>
2008-01-30x86: cleanup ioremap includesThomas Gleixner
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>
2008-01-30x86: style cleanup of ioremap codeThomas Gleixner
Fix the coding style before going further. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-01-30x86: fix ioremap pgprot inconsistencyThomas Gleixner
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>
2008-01-30x86: fix ioremap pgprot inconsistencyThomas Gleixner
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>
2008-01-30x86: turn the check_exec function into function thatArjan van de Ven
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>
2008-01-30x86: cpa: make self-test depend on DEBUG_KERNELIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: ioremap_nocache fixHuang, Ying
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>
2008-01-30x86: add PAGE_KERNEL_EXEC_NOCACHEIngo Molnar
add PAGE_KERNEL_EXEC_NOCACHE. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: fix NX bit handling in change_page_attr()Huang, Ying
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>
2008-01-30x86: change cpa to pfn basedIngo Molnar
change CPA to pfn based. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: keep the BIOS area executableIngo Molnar
keep the BIOS area executable. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: add PG_LEVEL enumThomas Gleixner
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>
2008-01-30x86: clean up lookup_address() declarationsThomas Gleixner
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: clean up arch/x86/mm/pageattr.cIngo Molnar
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>
2008-01-30x86: re-add clflush_cache_range()Ingo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: unify pageattr_32.c and pageattr_64.cIngo Molnar
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>
2008-01-30x86: prepare for pageattr.c unificationIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: backmerge 64-bit details into 32-bit pageattr.cIngo Molnar
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>
2008-01-30x86: enable DEBUG_PAGEALLOC on 64-bitIngo Molnar
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>
2008-01-30x86: add kernel_map_pages() to 64-bitIngo Molnar
needed for DEBUG_PAGEALLOC support and for unification. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: return -EINVAL in __change_page_attr(), instead of 0Ingo Molnar
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>
2008-01-30x86: clean up differences between 64-bit and 32-bitIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: 64-bit, add the new split_large_page() functionIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: 64-bit pageattr.c, prepare for unificationIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: change 64-bit pageattr to use set_pte_atomic()Ingo Molnar
NOP change - same as set_pte(). Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: change 64-bit __change_page_attr() to struct pageIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: simplify __change_page_attr()Ingo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: introduce native_set_pte_atomic() on 64-bit tooIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: clean up and simplify 64-bit split_large_page()Ingo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: unify header part of pageattr_64.cIngo Molnar
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: simplify pageattr_64.cIngo Molnar
simplify pageattr_64.c. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-01-30x86: prepare for the unification of the cpa codeIngo Molnar
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>
2008-01-30x86: prepare for the unification of the cpa codeIngo Molnar
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>
2008-01-30x86: cpa self-test, WARN_ON()Ingo Molnar
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>
2008-01-30x86: do not PSE on CONFIG_DEBUG_PAGEALLOC=yIngo Molnar
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>
2008-01-30x86: cpa: simplify lockingIngo Molnar
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>
2008-01-30x86: simplify cpa largepage split, #3Ingo Molnar
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>
2008-01-30x86: cpa self-test fixesIngo Molnar
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>
2008-01-30x86: further cpa largepage-split cleanupsIngo Molnar
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>
2008-01-30x86: simplify 32-bit cpa largepage splittingIngo Molnar
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>
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