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path: root/arch/sparc/mm/srmmu.c
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2014-12-18sparc32: destroy_context() and switch_mm() needs to disable interrupts.Andreas Larsson
Load balancing can be triggered in the critical sections protected by srmmu_context_spinlock in destroy_context() and switch_mm() and can hang the cpu waiting for the rq lock of another cpu that in turn has called switch_mm hangning on srmmu_context_spinlock leading to deadlock. So, disable interrupt while taking srmmu_context_spinlock in destroy_context() and switch_mm() so we don't deadlock. See also commit 77b838fa1ef0 ("[SPARC64]: destroy_context() needs to disable interrupts.") Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-04-29sparc32: fix sparse "Should it be static?" in mm/Sam Ravnborg
Fix following warnings: srmmu.c:870:13: warning: symbol 'srmmu_paging_init' was not declared. Should it be static? iommu.c:430:13: warning: symbol 'ld_mmu_iommu' was not declared. Should it be static? leon_mm.c:21:5: warning: symbol 'srmmu_swprobe_trace' was not declared. Should it be static? Add proper prototypes or define static to fix them. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-04-29sparc32: fix sparse warnings in srmmu.cSam Ravnborg
Fix following warnings: srmmu.c:78:5: warning: symbol 'flush_page_for_dma_global' was not declared. Should it be static? srmmu.c:85:5: warning: symbol 'viking_mxcc_present' was not declared. Should it be static? srmmu.c:103:6: warning: symbol 'srmmu_nocache_bitmap' was not declared. Should it be static? srmmu.c:176:24: warning: Using plain integer as NULL pointer srmmu.c:731:46: warning: Using plain integer as NULL pointer srmmu.c:731:46: warning: Using plain integer as NULL pointer srmmu.c:731:46: warning: Using plain integer as NULL pointer srmmu.c:870:13: warning: symbol 'srmmu_paging_init' was not declared. Should it be static? Add proper prototypes in mm_32.h and drop local prototype in init_32.c Replace 0 with NULL Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-04-29sparc32: fix sparse warning in init_32.cSam Ravnborg
Fix following warning: init_32.c:112:22: warning: symbol 'bootmem_init' was not declared. Should it be static? Fix by adding a proper prototype in pgtable_32.h and drop the local prototype in srmmu.c Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-04-29sparc32: rename mm/srmmu.h to mm/mm_32.hSam Ravnborg
This file will be used for more than just srmmu stuff, so the old name was misleading. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-02-19sparc32: make copy_to/from_user_page() usable from modular codePaul Gortmaker
While copy_to/from_user_page() users are uncommon, there is one in drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c which leads to the following: ERROR: "sparc32_cachetlb_ops" [drivers/staging/lustre/lustre/libcfs/libcfs.ko] undefined! during routine allmodconfig build coverage. The reason this happens is as follows: In arch/sparc/include/asm/cacheflush_32.h we have: #define flush_cache_page(vma,addr,pfn) \ sparc32_cachetlb_ops->cache_page(vma, addr) #define copy_to_user_page(vma, page, vaddr, dst, src, len) \ do { \ flush_cache_page(vma, vaddr, page_to_pfn(page));\ memcpy(dst, src, len); \ } while (0) #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ do { \ flush_cache_page(vma, vaddr, page_to_pfn(page));\ memcpy(dst, src, len); \ } while (0) However, sparc32_cachetlb_ops isn't exported and hence the error. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-11-15sparc: handle pgtable_page_ctor() failKirill A. Shutemov
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-14sparc: delete __cpuinit/__CPUINIT usage from all usersPaul Gortmaker
The __cpuinit type of throwaway sections might have made sense some time ago when RAM was more constrained, but now the savings do not offset the cost and complications. For example, the fix in commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time") is a good example of the nasty type of bugs that can be created with improper use of the various __init prefixes. After a discussion on LKML[1] it was decided that cpuinit should go the way of devinit and be phased out. Once all the users are gone, we can then finally remove the macros themselves from linux/init.h. Note that some harmless section mismatch warnings may result, since notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c) are flagged as __cpuinit -- so if we remove the __cpuinit from arch specific callers, we will also get section mismatch warnings. As an intermediate step, we intend to turn the linux/init.h cpuinit content into no-ops as early as possible, since that will get rid of these warnings. In any case, they are temporary and harmless. This removes all the arch/sparc uses of the __cpuinit macros from C files and removes __CPUINIT from assembly files. Note that even though arch/sparc/kernel/trampoline_64.S has instances of ".previous" in it, they are all paired off against explicit ".section" directives, and not implicitly paired with __CPUINIT (unlike mips and arm were). [1] https://lkml.org/lkml/2013/5/20/589 Cc: "David S. Miller" <davem@davemloft.net> Cc: sparclinux@vger.kernel.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2013-03-31sparc/srmmu: clear trailing edge of bitmap properlyAkinobu Mita
srmmu_nocache_bitmap is cleared by bit_map_init(). But bit_map_init() attempts to clear by memset(), so it can't clear the trailing edge of bitmap properly on big-endian architecture if the number of bits is not a multiple of BITS_PER_LONG. Actually, the number of bits in srmmu_nocache_bitmap is not always a multiple of BITS_PER_LONG. It is calculated as below: bitmap_bits = srmmu_nocache_size >> SRMMU_NOCACHE_BITMAP_SHIFT; srmmu_nocache_size is decided proportionally by the amount of system RAM and it is rounded to a multiple of PAGE_SIZE. SRMMU_NOCACHE_BITMAP_SHIFT is defined as (PAGE_SHIFT - 4). So it can only be said that bitmap_bits is a multiple of 16. This fixes the problem by using bitmap_clear() instead of memset() in bit_map_init() and this also uses BITS_TO_LONGS() to calculate correct size at bitmap allocation time. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: sparclinux@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-26sparc32: move probe_memory() to srmmu.cSam Ravnborg
Only one user so move it to the file using it. It had nothing to do in fault_32. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-26sparc32: centralize all mmu context handling in srmmu.cSam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-26sparc32: beautify srmmu_inherit_prom_mappings()Sam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-26sparc32: use void * in nocache get/freeSam Ravnborg
This allowed to us to kill a lot of casts, with no loss of readability in any places Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-26sparc32: fix coding-style in srmmu.cSam Ravnborg
Fix the most annoying issues that distracts me: - whitespace - missing space after "if" and "while" - spaces around operators and similar simple things. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-26sparc32: sort includes in srmmu.cSam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-07-26sparc32: define a few srmmu functions __initSam Ravnborg
They are only used during early init so lets get rid of them after init to save some RAM. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-27sparc32: srmmu_probe now knows about leon tooSam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Daniel Hellstrom <daniel@gaisler.com> Cc: Konrad Eisele <konrad@gaisler.com>
2012-05-22sparc32: use the common implementation of alloc_thread_info_node()Sam Ravnborg
With sun4c removed we can fall-back to the common implementation. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-19sparc32: drop unused inline functions in srmmu.cSam Ravnborg
When decelared inline the compiler does not warn about unused functions. But they are not used so drop them. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-19sparc32,leon: move leon mmu functions to leon_mm.cSam Ravnborg
We already have a leaon specific file - so keep all the laon stuff in one place. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Konrad Eisele <konrad@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-15sparc32: Remove cypress cpu support.David S. Miller
It's the one aberration in v8, the only cpu that didn't actually have hardware multiply and divide instructions. Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Sam Ravnborg <sam@ravnborg.org>
2012-05-14sparc32: remove runtime btfix supportSam Ravnborg
- remove all uses of btfixup header - remove the btfixup header - remove the btfixup code Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-13sparc32: Move cache and TLB flushes over to method ops.David S. Miller
This eliminated most of the remaining users of btfixup. There are some complications because of the special cases we have for sun4d, leon, and some flavors of viking. It was found that there are no cases where a flush_page_for_dma method was not hooked up to something, so the "noflush" iommu methods were removed. Add some documentation to the viking_sun4d_smp_ops to describe exactly the hardware bug which causes us to need special TLB flushing on sun4d. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-13sparc32: Remove unused declarations in srmmu.cDavid S. Miller
Uses of these went away with the sun4c removal. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-13sparc32: Un-btfixup update_mmu_cache().David S. Miller
The magic Swift SRMMU code in question has not been enabled for something on the order of a decade, and it as well as it's comment is there in the history in case we ever need it again. Therefore all implementations are NOPs and we can kill this stuff off. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-13sparc32: Kill btfixup for xchg()'s 'swap' instruction.David S. Miller
We always have this instruction available, so no need to use btfixup for it any more. This also eradicates the whole of atomic_32.S and thus the __atomic_begin and __atomic_end symbols completely. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-13sparc32: drop btfixup in mmu_context_32.hSam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-13sparc32: drop btfixup in pgtable_32.hSam Ravnborg
Only one function left using btfixup. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-13sparc32: drop btfixup in pgalloc_32.hSam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup more PTE constants and PTE ops.David S. Miller
pte_{filei,wrprotecti,mkcleani,mkoldi} pte_{mkwrite,mkdirty,mkyoung} Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup pte_{write,dirty,young}iDavid S. Miller
And we can certainly get rid of the const function attributes, there is no way that's needed any longer and no other arch uses this kind of annotation here. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup set_pte, pte_present, mk_pte{_phys,_io}().David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: drop loadmmuSam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup pmd_{bad,present}().David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup pgd_{none,bad,present}.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup PAGE_{NONE,COPY,READONLY,SHARED,KERNEL}.David S. Miller
That lets us also get rid of the run-time initialization of protection_map[] and all the ugly module workarounds for PAGE_KERNEL and PAGE_SHARED to deal with the fact that we can't do btfixups for modular code. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup pmd_page and pte_pfn.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup {pte,pmd,pgd}_clear().David S. Miller
Also we can remove BTFIXUPCALL_SWAPO0G0 as that is no longer used. This was rather amusing, we were setting the btfixup vectors based upon cpu type but all to the same exact generic srmmu routines. Furthermore, we were inconsistently marking the fixup as either BTFIXUPCALL_SWAPO0G0 or BTFIXUPCALL_NORM. What a mess, glad we could untangle this stuff. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Un-btfixup PGDIR_{SHIFT,SIZE,MASK} {USER_,}PTRS_PER_{PGD,PMD}David S. Miller
Only one set of values exist, the SRMMU ones. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: drop btfixup for check_pgt_cacheSam Ravnborg
It is a noop for srmmu - so use a define as sparc64 does. And drop all sparc callers - no need to confuse our-self be calling a noop function. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: drop btfixup for switch_mmSam Ravnborg
This revealed that the implementation of switch_mm had a bogus extra argument. No harm as said argument was never used - but confusing. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-12sparc32: Trivial removal of sun4c references in comments.David S. Miller
I left some around, like the ones in the openprom headers, since we need to think about which pieces of those datastructures and code we can completely toss now. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-11sparc32: use inline versions of pgprot_noncached, pte_to_pgoff and pgoff_to_pteSam Ravnborg
We no longer have different versions of these so use a few simple static inline functions. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-11sparc32: drop btfixup for alloc_thread_info_node/free_thread_infoSam Ravnborg
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-11sparc32: drop sun4c user stack checking routineSam Ravnborg
With this we no longer do any run-time patchings of traps. So drop the function + macro to support this. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-11sparc32: drop sun4c stack checking routineSam Ravnborg
And drop run-time patching too. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-11sparc32: drop sun4c window overflow stack checking routineSam Ravnborg
Also drop run-time patching for srmmu Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-11sparc32: drop sun4c specific stack validationSam Ravnborg
This allows us to kill run-time patching for this function too Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-11sparc32: remove sun4c trapsSam Ravnborg
We used to runtime patch the trap table for srmmu. With the removal of sun4c support this is no longer required. With the sun4c trap removed we can remove all the referenced trap handling which is sun4c specific. This also allows us to get rid of the nosun4c.c file that contained only dummy functions/data. Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-02-28sparc: Use vsprintf extention %pf with builtin_return_addressJoe Perches
Emit the function name not the address when possible. builtin_return_address() gives an address. When building a kernel with CONFIG_KALLSYMS, emit the actual function name not the address. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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