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2020-01-23powerpc/ptdump: Fix W+X verificationChristophe Leroy1-1/+3
Verification cannot rely on simple bit checking because on some platforms PAGE_RW is 0, checking that a page is not W means checking that PAGE_RO is set instead of checking that PAGE_RW is not set. Use pte helpers instead of checking bits. Fixes: 453d87f6a8ae ("powerpc/mm: Warn if W+X pages found on boot") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0d894839fdbb19070f0e1e4140363be4f2bb62fc.1578989540.git.christophe.leroy@c-s.fr
2020-01-23powerpc/ptdump: don't entirely rebuild kernel when selecting CONFIG_PPC_DEBUG_WXChristophe Leroy1-0/+2
Selecting CONFIG_PPC_DEBUG_WX only impacts ptdump and pgtable_32/64 init calls. Declaring related functions in asm/pgtable.h implies rebuilding almost everything. Move ptdump_check_wx() declaration in mm/mmu_decl.h Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bf34fd9dca61eadf9a134a9f89ebbc162cfd5f86.1578986011.git.christophe.leroy@c-s.fr
2019-08-28powerpc: use the generic dma coherent remap allocatorChristoph Hellwig1-9/+0
This switches to using common code for the DMA allocations, including potential use of the CMA allocator if configured. Switching to the generic code enables DMA allocations from atomic context, which is required by the DMA API documentation, and also adds various other minor features drivers start relying upon. It also makes sure we have on tested code base for all architectures that require uncached pte bits for coherent DMA allocations. Another advantage is that consistent memory allocations now share the general vmalloc pool instead of needing an explicit careout from it. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> # tested on 8xx Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190814132230.31874-2-hch@lst.de
2019-08-28powerpc/32s: get rid of CPU_FTR_601 featureChristophe Leroy1-1/+1
Now that 601 is exclusive from other 6xx, CPU_FTR_601 and associated fixups are useless. Drop this feature and use #ifdefs instead. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ecdb7194a17dbfa01865df6a82979533adc2c70b.1566834712.git.christophe.leroy@c-s.fr
2019-08-20powerpc/ptdump: drop non vital #ifdefsChristophe Leroy1-15/+9
hashpagetable.c is only compiled when CONFIG_PPC_BOOK3S_64 is defined, so drop the test and its 'else' branch. Use IS_ENABLED(CONFIG_PPC_PSERIES) instead of #ifdef, this allows the code to be checked at any build. It is still optimised out by GCC. Use IS_ENABLED(CONFIG_PPC_64K_PAGES) instead of #ifdef. Use IS_ENABLED(CONFIG_SPARSEMEN_VMEMMAP) instead of #ifdef. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c8998ed32e4e3954b56a8dacecfe43319a2a0483.1565786091.git.christophe.leroy@c-s.fr
2019-08-20powerpc/ptdump: get out of note_prot_wx() when CONFIG_PPC_DEBUG_WX is not ↵Christophe Leroy1-1/+1
selected. When CONFIG_PPC_DEBUG_WX, note_prot_wx() is useless. Get out of it early and inconditionnally in that case, so that GCC can kick all the code out. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ff6c8f631bd4ce3a10e0cc241eb569816187bc20.1565786091.git.christophe.leroy@c-s.fr
2019-08-20powerpc/ptdump: drop dummy KERN_VIRT_START on PPC32Christophe Leroy1-10/+8
PPC32 doesn't have KERN_VIRT_START. Make PAGE_OFFSET the default starting address for the dump, and drop the dummy definition of KERN_VIRT_START. Only use KERN_VIRT_START for non radix PPC64. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/334632b1df4775b0ccf3bdc8d6b201d14e3daedd.1565786091.git.christophe.leroy@c-s.fr
2019-08-20powerpc/ptdump: fix walk_pagetables() address mismatchChristophe Leroy1-5/+3
walk_pagetables() always walk the entire pgdir from address 0 but considers PAGE_OFFSET or KERN_VIRT_START as the starting address of the walk, resulting in a possible mismatch in the displayed addresses. Ex: on PPC32, when KERN_VIRT_START was locally defined as PAGE_OFFSET, ptdump displayed 0x80000000 instead of 0xc0000000 for the first kernel page, because 0xc0000000 + 0xc0000000 = 0x80000000 Start the walk at st->start_address instead of starting at 0. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/5aa2ac513295f594cce8ddb1c649f61947bd063d.1565786091.git.christophe.leroy@c-s.fr
2019-08-20powerpc/ptdump: Fix addresses display on PPC32Christophe Leroy1-1/+1
Commit 453d87f6a8ae ("powerpc/mm: Warn if W+X pages found on boot") wrongly changed KERN_VIRT_START from 0 to PAGE_OFFSET, leading to a shift in the displayed addresses. Lets revert that change to resync walk_pagetables()'s addr val and pgd_t pointer for PPC32. Fixes: 453d87f6a8ae ("powerpc/mm: Warn if W+X pages found on boot") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/eb4d626514e22f85814830012642329018ef6af9.1565786091.git.christophe.leroy@c-s.fr
2019-07-14Merge tag 'powerpc-5.3-1' of ↵Linus Torvalds1-3/+3
git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: "Notable changes: - Removal of the NPU DMA code, used by the out-of-tree Nvidia driver, as well as some other functions only used by drivers that haven't (yet?) made it upstream. - A fix for a bug in our handling of hardware watchpoints (eg. perf record -e mem: ...) which could lead to register corruption and kernel crashes. - Enable HAVE_ARCH_HUGE_VMAP, which allows us to use large pages for vmalloc when using the Radix MMU. - A large but incremental rewrite of our exception handling code to use gas macros rather than multiple levels of nested CPP macros. And the usual small fixes, cleanups and improvements. Thanks to: Alastair D'Silva, Alexey Kardashevskiy, Andreas Schwab, Aneesh Kumar K.V, Anju T Sudhakar, Anton Blanchard, Arnd Bergmann, Athira Rajeev, Cédric Le Goater, Christian Lamparter, Christophe Leroy, Christophe Lombard, Christoph Hellwig, Daniel Axtens, Denis Efremov, Enrico Weigelt, Frederic Barrat, Gautham R. Shenoy, Geert Uytterhoeven, Geliang Tang, Gen Zhang, Greg Kroah-Hartman, Greg Kurz, Gustavo Romero, Krzysztof Kozlowski, Madhavan Srinivasan, Masahiro Yamada, Mathieu Malaterre, Michael Neuling, Nathan Lynch, Naveen N. Rao, Nicholas Piggin, Nishad Kamdar, Oliver O'Halloran, Qian Cai, Ravi Bangoria, Sachin Sant, Sam Bobroff, Satheesh Rajendran, Segher Boessenkool, Shaokun Zhang, Shawn Anastasio, Stewart Smith, Suraj Jitindar Singh, Thiago Jung Bauermann, YueHaibing" * tag 'powerpc-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (163 commits) powerpc/powernv/idle: Fix restore of SPRN_LDBAR for POWER9 stop state. powerpc/eeh: Handle hugepages in ioremap space ocxl: Update for AFU descriptor template version 1.1 powerpc/boot: pass CONFIG options in a simpler and more robust way powerpc/boot: add {get, put}_unaligned_be32 to xz_config.h powerpc/irq: Don't WARN continuously in arch_local_irq_restore() powerpc/module64: Use symbolic instructions names. powerpc/module32: Use symbolic instructions names. powerpc: Move PPC_HA() PPC_HI() and PPC_LO() to ppc-opcode.h powerpc/module64: Fix comment in R_PPC64_ENTRY handling powerpc/boot: Add lzo support for uImage powerpc/boot: Add lzma support for uImage powerpc/boot: don't force gzipped uImage powerpc/8xx: Add microcode patch to move SMC parameter RAM. powerpc/8xx: Use IO accessors in microcode programming. powerpc/8xx: replace #ifdefs by IS_ENABLED() in microcode.c powerpc/8xx: refactor programming of microcode CPM params. powerpc/8xx: refactor printing of microcode patch name. powerpc/8xx: Refactor microcode write powerpc/8xx: refactor writing of CPM microcode arrays ...
2019-07-04powerpc/book3s: Use config independent helpers for page table walkAneesh Kumar K.V1-3/+3
Even when we have HugeTLB and THP disabled, kernel linear map can still be mapped with hugepages. This is only an issue with radix translation because hash MMU doesn't map kernel linear range in linux page table and other kernel map areas are not mapped using hugepage. Add config independent helpers and put WARN_ON() when we don't expect things to be mapped via hugepages. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-06-05treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441Thomas Gleixner2-10/+2
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation version 2 of the license extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 315 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531190115.503150771@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-02powerpc/mm: Warn if W+X pages found on bootRussell Currey1-1/+42
Implement code to walk all pages and warn if any are found to be both writable and executable. Depends on STRICT_KERNEL_RWX enabled, and is behind the DEBUG_WX config option. This only runs on boot and has no runtime performance implications. Very heavily influenced (and in some cases copied verbatim) from the ARM64 code written by Laura Abbott (thanks!), since our ptdump infrastructure is similar. Signed-off-by: Russell Currey <ruscur@russell.cc> [mpe: Fixup build error when disabled] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-02powerpc/mm/ptdump: Wrap seq_printf() to handle NULL pointersRussell Currey1-10/+22
Lovingly borrowed from the arch/arm64 ptdump code. This doesn't seem to be an issue in practice, but is necessary for my upcoming commit. Signed-off-by: Russell Currey <ruscur@russell.cc> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-02powerpc/32: prepare shadow area for KASANChristophe Leroy1-0/+8
This patch prepares a shadow area for KASAN. The shadow area will be at the top of the kernel virtual memory space above the fixmap area and will occupy one eighth of the total kernel virtual memory space. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-04-21powerpc/mm/hash64: Map all the kernel regions in the same 0xc rangeAneesh Kumar K.V2-2/+3
This patch maps vmalloc, IO and vmemap regions in the 0xc address range instead of the current 0xd and 0xf range. This brings the mapping closer to radix translation mode. With hash 64K page size each of this region is 512TB whereas with 4K config we are limited by the max page table range of 64TB and hence there regions are of 16TB size. The kernel mapping is now: On 4K hash kernel_region_map_size = 16TB kernel vmalloc start = 0xc000100000000000 kernel IO start = 0xc000200000000000 kernel vmemmap start = 0xc000300000000000 64K hash, 64K radix and 4k radix: kernel_region_map_size = 512TB kernel vmalloc start = 0xc008000000000000 kernel IO start = 0xc00a000000000000 kernel vmemmap start = 0xc00c000000000000 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-03-02powerpc/mm: Check secondary hash page tableRashmica Gupta1-1/+1
We were always calling base_hpte_find() with primary = true, even when we wanted to check the secondary table. mpe: I broke this when refactoring Rashmica's original patch. Fixes: 1515ab932156 ("powerpc/mm: Dump hash table") Signed-off-by: Rashmica Gupta <rashmica.g@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-02-22powerpc: Move page table dump files in a dedicated subdirectoryChristophe Leroy9-0/+1476
This patch moves the files related to page table dump in a dedicated subdirectory. The purpose is to clean a bit arch/powerpc/mm by regrouping multiple files handling a dedicated function. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Shorten the file names while we're at it] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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