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2019-05-03powerpc/32: use memset() instead of memset_io() to zero BSSChristophe Leroy1-2/+2
Since commit 400c47d81ca38 ("powerpc32: memset: only use dcbz once cache is enabled"), memset() can be used before activation of the cache, so no need to use memset_io() for zeroing the BSS. Acked-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc: don't use direct assignation during early boot.Christophe Leroy2-5/+18
In kernel/cputable.c, explicitly use memcpy() instead of *y = *x; This will allow GCC to replace it with __memcpy() when KASAN is selected. Acked-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/prom_init: don't use string functions from lib/Christophe Leroy2-42/+171
When KASAN is active, the string functions in lib/ are doing the KASAN checks. This is too early for prom_init. This patch implements dedicated string functions for prom_init, which will be compiled in with KASAN disabled. Size of prom_init before the patch: text data bss dec hex filename 12060 488 6960 19508 4c34 arch/powerpc/kernel/prom_init.o Size of prom_init after the patch: text data bss dec hex filename 12460 488 6960 19908 4dc4 arch/powerpc/kernel/prom_init.o This increases the size of prom_init a bit, but as prom_init is in __init section, it is freed after boot anyway. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc: remove CONFIG_CMDLINE #ifdef messChristophe Leroy2-9/+6
This patch makes CONFIG_CMDLINE defined at all time. It avoids having to enclose related code inside #ifdef CONFIG_CMDLINE Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc: prepare string/mem functions for KASANChristophe Leroy10-13/+82
CONFIG_KASAN implements wrappers for memcpy() memmove() and memset() Those wrappers are doing the verification then call respectively __memcpy() __memmove() and __memset(). The arches are therefore expected to rename their optimised functions that way. For files on which KASAN is inhibited, #defines are used to allow them to directly call optimised versions of the functions without going through the KASAN wrappers. See commit 393f203f5fd5 ("x86_64: kasan: add interceptors for memset/memmove/memcpy functions") for details. Other string / mem functions do not (yet) have kasan wrappers, we therefore have to fallback to the generic versions when KASAN is active, otherwise KASAN checks will be skipped. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Fixups to keep selftests working] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/32: Move early_init() in a separate fileChristophe Leroy3-29/+37
In preparation of KASAN, move early_init() into a separate file in order to allow deactivation of KASAN for that function. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: refactor pgd_alloc() and pgd_free() on nohashChristophe Leroy3-22/+12
pgd_alloc() and pgd_free() are identical on nohash 32 and 64. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: refactor pmd_pgtable()Christophe Leroy5-11/+5
pmd_pgtable() is identical on the 4 subarches, refactor it. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: refactor pgtable freeing functions on nohashChristophe Leroy3-86/+44
pgtable_free() and others are identical on nohash/32 and 64, so move them into asm/nohash/pgalloc.h Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: Only keep one version of pmd_populate() functions on nohash/32Christophe Leroy1-20/+8
Use IS_ENABLED(CONFIG_BOOKE) to make single versions of pmd_populate() and pmd_populate_kernel() Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: refactor definition of pgtable_cache[]Christophe Leroy5-86/+21
pgtable_cache[] is the same for the 4 subarches, lets make it common. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: refactor pte_alloc_one() and pte_free() families definition.Christophe Leroy5-97/+25
Functions pte_alloc_one(), pte_alloc_one_kernel(), pte_free(), pte_free_kernel() are identical for the four subarches. This patch moves their definition in a common place. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: inline pte_alloc_one_kernel() and pte_alloc_one() on PPC32Christophe Leroy3-16/+24
pte_alloc_one_kernel() and pte_alloc_one() are simple calls to pte_fragment_alloc(), so they are good candidates for inlining as already done on PPC64. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: don't use pte_alloc_kernel() until slab is available on PPC32Christophe Leroy1-6/+28
In the same way as PPC64, implement early allocation functions and avoid calling pte_alloc_kernel() before slab is available. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/book3e: move early_alloc_pgtable() to init sectionChristophe Leroy1-2/+2
early_alloc_pgtable() is only used during init. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/Kconfig: select PPC_MM_SLICES from subarch typeChristophe Leroy1-2/+2
Lets select PPC_MM_SLICES from the subarch config item instead of doing it via defaults declaration in the PPC_MM_SLICES item itself. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: get rid of nohash/32/mmu.h and nohash/64/mmu.hChristophe Leroy4-33/+14
Those files have no real added values, especially the 64 bit which only includes the common book3e mmu.h which is also included from 32 bits side. So lets do the final inclusion directly from nohash/mmu.h Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: move pgtable_t in asm/mmu.hChristophe Leroy5-24/+3
pgtable_t is now identical for all subarches, move it to the top level asm/mmu.h Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: convert Book3E 64 to pte_fragmentChristophe Leroy5-30/+17
Book3E 64 is the only subarch not using pte_fragment. In order to allow refactorisation, this patch converts it to pte_fragment. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: drop __bad_pte()Christophe Leroy2-4/+0
This has never been called (since Kernel has been in git at least), drop it. Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: flatten function __find_linux_pte() step 3Christophe Leroy1-49/+49
__find_linux_pte() is full of if/else which is hard to follow allthough the handling is pretty simple. Previous patches left a { } block. This patch removes it. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: flatten function __find_linux_pte() step 2Christophe Leroy1-32/+30
__find_linux_pte() is full of if/else which is hard to follow allthough the handling is pretty simple. Previous patch left { } blocks. This patch removes the first one by shifting its content to the left. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: flatten function __find_linux_pte() step 1Christophe Leroy1-10/+22
__find_linux_pte() is full of if/else which is hard to follow allthough the handling is pretty simple. This patch flattens the function by getting rid of as much if/else as possible. In order to ease the review, this is done in three steps. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: cleanup remaining ifdef mess in hugetlbpage.cChristophe Leroy1-7/+5
Only 3 subarches support huge pages. So when it is either 2 of them, it is not the third one. And mmu_has_feature() is known by all subarches so IS_ENABLED() can be used instead of #ifdef Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: cleanup HPAGE_SHIFT setupChristophe Leroy5-24/+30
Only book3s/64 may select default among several HPAGE_SHIFT at runtime. 8xx always defines 512K pages as default FSL_BOOK3E always defines 4M pages as default This patch limits HUGETLB_PAGE_SIZE_VARIABLE to book3s/64 moves the definitions in subarches files. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: move hugetlb_disabled into asm/hugetlb.hChristophe Leroy4-1/+4
No need to have this in asm/page.h, move it into asm/hugetlb.h Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: cleanup ifdef mess in add_huge_page_size()Christophe Leroy4-34/+43
Introduce a subarch specific helper check_and_get_huge_psize() to check the huge page sizes and cleanup the ifdef mess in add_huge_page_size() Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: add a helper to populate hugepdChristophe Leroy4-19/+20
This patchs adds a subarch helper to populate hugepd. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: split asm/hugetlb.h into dedicated subarch filesChristophe Leroy4-83/+106
Three subarches support hugepages: - fsl book3e - book3s/64 - 8xx This patch splits asm/hugetlb.h to reduce the #ifdef mess. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: make gup_hugepte() staticChristophe Leroy2-22/+19
gup_huge_pd() is the only user of gup_hugepte() and it is located in the same file. This patch moves gup_huge_pd() after gup_hugepte() and makes gup_hugepte() static. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: make hugetlbpage.c depend on CONFIG_HUGETLB_PAGEChristophe Leroy2-6/+1
The only function in hugetlbpage.c which doesn't depend on CONFIG_HUGETLB_PAGE is gup_hugepte(), and this function is only called from gup_huge_pd() which depends on CONFIG_HUGETLB_PAGE so all the content of hugetlbpage.c depends on CONFIG_HUGETLB_PAGE. This patch modifies Makefile to only compile hugetlbpage.c when CONFIG_HUGETLB_PAGE is set. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: move __find_linux_pte() out of hugetlbpage.cChristophe Leroy2-103/+104
__find_linux_pte() is the only function in hugetlbpage.c which is compiled in regardless on CONFIG_HUGETLBPAGE This patch moves it in pgtable.c. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/book3e: hugetlbpage is only for CONFIG_PPC_FSL_BOOK3EChristophe Leroy2-29/+20
As per Kconfig.cputype, only CONFIG_PPC_FSL_BOOK3E gets to select SYS_SUPPORTS_HUGETLBFS so simplify accordingly. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/64: only book3s/64 supports CONFIG_PPC_64K_PAGESChristophe Leroy9-72/+5
CONFIG_PPC_64K_PAGES cannot be selected by nohash/64. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/book3e: drop mmu_get_tsize()Christophe Leroy1-5/+0
This function is not used anymore, drop it. Fixes: b42279f0165c ("powerpc/mm/nohash: MM_SLICE is only used by book3s 64") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: define subarch SLB_ADDR_LIMIT_DEFAULTChristophe Leroy5-9/+7
This patch defines a subarch specific SLB_ADDR_LIMIT_DEFAULT to remove the #ifdefs around the setup of mm->context.slb_addr_limit It also generalises the use of mm_ctx_set_slb_addr_limit() helper. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: define get_slice_psize() all the timeChristophe Leroy2-3/+6
get_slice_psize() can be defined regardless of CONFIG_PPC_MM_SLICES to avoid ifdefs Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/8xx: get rid of #ifdef CONFIG_HUGETLB_PAGE for slicesChristophe Leroy1-4/+1
The 8xx only selects CONFIG_PPC_MM_SLICES when CONFIG_HUGETLB_PAGE is set. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: remove a couple of #ifdef CONFIG_PPC_64K_PAGES in mm/slice.cChristophe Leroy1-6/+4
This patch replaces a couple of #ifdef CONFIG_PPC_64K_PAGES by IS_ENABLED(CONFIG_PPC_64K_PAGES) to improve code maintainability. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: remove unnecessary #ifdef CONFIG_PPC64Christophe Leroy1-3/+1
For PPC32 that's a noop, gcc should be smart enough to ignore it. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: get rid of mm_ctx_slice_mask_xxx()Christophe Leroy2-45/+4
Now that slice_mask_for_size() is in mmu.h, the mm_ctx_slice_mask_xxx() are not needed anymore, so drop them. Note that the 8xx ones where not used anyway. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: move slice_mask_for_size() into mmu.hChristophe Leroy3-47/+46
Move slice_mask_for_size() into subarch mmu.h Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> [mpe: Retain the BUG_ON()s, rather than converting to VM_BUG_ON()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: hand a context_t over to slice_mask_for_size() instead of mm_structChristophe Leroy1-17/+17
slice_mask_for_size() only uses mm->context, so hand directly a pointer to the context. This will help moving the function in subarch mmu.h in the next patch by avoiding having to include the definition of struct mm_struct Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: no slice for nohash/64Christophe Leroy3-15/+5
Only nohash/32 and book3s/64 support mm slices. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: fix erroneous duplicate slb_addr_limit initChristophe Leroy1-6/+0
Commit 67fda38f0d68 ("powerpc/mm: Move slb_addr_linit to early_init_mmu") moved slb_addr_limit init out of setup_arch(). Commit 701101865f5d ("powerpc/mm: Reduce memory usage for mm_context_t for radix") brought it back into setup_arch() by error. This patch reverts that erroneous regress. Fixes: 701101865f5d ("powerpc/mm: Reduce memory usage for mm_context_t for radix") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: Move nohash specifics in subdirectory mm/nohashChristophe Leroy12-16/+19
Many files in arch/powerpc/mm are only for nohash. This patch creates a subdirectory for them. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Shorten new filenames] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: Move book3s32 specifics in subdirectory mm/book3s64Christophe Leroy6-2/+4
Several files in arch/powerpc/mm are only for book3S32. This patch creates a subdirectory for them. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Shorten new filenames] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03powerpc/mm: Move book3s64 specifics in subdirectory mm/book3s64Christophe Leroy24-92/+126
Many files in arch/powerpc/mm are only for book3S64. This patch creates a subdirectory for them. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Update the selftest sym links, shorten new filenames, cleanup some whitespace and formatting in the new files.] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-02powerpc/mm: change #include "mmu_decl.h" to <mm/mmu_decl.h>Christophe Leroy17-17/+17
This patch make inclusion of mmu_decl.h independant of the location of the file including it. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-02powerpc/nohash64: clean pgtable.hChristophe Leroy1-5/+0
TRANSPARENT_HUGEPAGE is only supported by book3s VMEMMAP_REGION_ID is never used Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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