kernel/linux.git/arch/xtensa/include/asm/fixmap.h, branch v6.12.80

xtensa/mm/highmem: Make generic kmap_atomic() work correctly

2020-11-16T20:19:24+00:00

The conversion to the generic kmap_atomic() implementation missed the fact that xtensa's fixmap works bottom up while all other implementations work top down. There is no real reason why xtensa needs to work that way. Cure it by: - Using the generic fix_to_virt()/virt_to_fix() functions which work top down - Adjusting the mapping defines - Using the generic index calculation for the non cache aliasing case - Making the cache colour offset reverse so the effective index is correct While at it, remove the outdated and misleading comment above the fixmap enum which originates from the initial copy&pasta of this code from i386. [ Max: Fixed the off by one in the index calculation ] Fixes: 629ed3f7dad2 ("xtensa/mm/highmem: Switch to generic kmap atomic") Reported-by: Max Filippov Signed-off-by: Thomas Gleixner Signed-off-by: Max Filippov Signed-off-by: Thomas Gleixner Tested-by: Max Filippov Link: https://lore.kernel.org/r/20201116193253.23875-1-jcmvbkbc@gmail.com

xtensa/mm/highmem: Switch to generic kmap atomic

2020-11-06T22:14:57+00:00

No reason having the same code in every architecture Signed-off-by: Thomas Gleixner Cc: Chris Zankel Cc: Max Filippov Cc: Arnd Bergmann Link: https://lore.kernel.org/r/20201103095858.311016780@linutronix.de

mm: pgtable: add shortcuts for accessing kernel PMD and PTE

2020-06-09T16:39:13+00:00

The powerpc 32-bit implementation of pgtable has nice shortcuts for accessing kernel PMD and PTE for a given virtual address. Make these helpers available for all architectures. [rppt@linux.ibm.com: microblaze: fix page table traversal in setup_rt_frame()] Link: http://lkml.kernel.org/r/20200518191511.GD1118872@kernel.org [akpm@linux-foundation.org: s/pmd_ptr_k/pmd_off_k/ in various powerpc places] Signed-off-by: Mike Rapoport Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brian Cain Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Guan Xuetao Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ley Foon Tan Cc: Mark Salter Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Nick Hu Cc: Paul Walmsley Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Tony Luck Cc: Vincent Chen Cc: Vineet Gupta Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200514170327.31389-9-rppt@kernel.org Signed-off-by: Linus Torvalds

mm: reorder includes after introduction of linux/pgtable.h

2020-06-09T16:39:13+00:00

The replacement of with made the include of the latter in the middle of asm includes. Fix this up with the aid of the below script and manual adjustments here and there. import sys import re if len(sys.argv) is not 3: print "USAGE: %s

" % (sys.argv[0]) sys.exit(1) hdr_to_move="#include " % sys.argv[2] moved = False in_hdrs = False with open(sys.argv[1], "r") as f: lines = f.readlines() for _line in lines: line = _line.rstrip(' ') if line == hdr_to_move: continue if line.startswith("#include Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brian Cain Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Guan Xuetao Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ley Foon Tan Cc: Mark Salter Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Nick Hu Cc: Paul Walmsley Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Tony Luck Cc: Vincent Chen Cc: Vineet Gupta Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200514170327.31389-4-rppt@kernel.org Signed-off-by: Linus Torvalds

mm: introduce include/linux/pgtable.h

2020-06-09T16:39:13+00:00

The include/linux/pgtable.h is going to be the home of generic page table manipulation functions. Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and make the latter include asm/pgtable.h. Signed-off-by: Mike Rapoport Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brian Cain Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Guan Xuetao Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ley Foon Tan Cc: Mark Salter Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Nick Hu Cc: Paul Walmsley Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Tony Luck Cc: Vincent Chen Cc: Vineet Gupta Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org Signed-off-by: Linus Torvalds

xtensa: get rid of __ARCH_USE_5LEVEL_HACK

2019-11-26T19:33:39+00:00

xtensa has 2-level page tables and already uses pgtable-nopmd for page table folding. Add walks of p4d level where appropriate and drop usage of __ARCH_USE_5LEVEL_HACK. Signed-off-by: Mike Rapoport Message-Id: <1572964400-16542-3-git-send-email-rppt@kernel.org> Signed-off-by: Max Filippov [fix up arch/xtensa/include/asm/fixmap.h and arch/xtensa/mm/tlb.c]

xtensa: move fixmap and kmap just above the KSEG

2017-12-17T06:37:12+00:00

The virtual address space between the page table and the VMALLOC region is big enough to host KASAN shadow map and there's enough space between the VMALLOC area and KSEG for the fixmap and kmap. Move fixmap and kmap to the gap between VMALLOC area and KSEG, just above the KSEG. Reorder entries in the kernel memory layout printing code. Drop duplicate PGTABLE_START definition, use XCHAL_PAGE_TABLE_VADDR instead. Signed-off-by: Max Filippov

xtensa: add alternative kernel memory layouts

2016-07-24T03:33:58+00:00

MMUv3 is able to support low memory bigger than 128MB. Implement 256MB and 512MB KSEG layouts: - add Kconfig selector for KSEG layout; - add KSEG base address, size and alignment definitions to arch/xtensa/include/asm/kmem_layout.h; - use new definitions in TLB initialization; - add build time memory map consistency checks. See Documentation/xtensa/mmu.txt for the details of new memory layouts. Signed-off-by: Max Filippov

xtensa: support aliasing cache in k[un]map_atomic

2014-08-14T07:59:21+00:00

Map high memory pages at virtual addresses with color that match color of their physical address. Existing cache alias management mechanisms may be used with such pages. Signed-off-by: Max Filippov

xtensa: make fixmap region addressing grow with index

2014-08-14T07:59:17+00:00

It's much easier to reason about alignment and coloring of regions located in the fixmap when fixmap index is just a PFN within the fixmap region. Change fixmap addressing so that index 0 corresponds to FIXADDR_START instead of the FIXADDR_TOP. Signed-off-by: Max Filippov