kernel.git/arch/powerpc/mm/pgtable.c, branch linux-6.4.y

powerpc/mm: move protection_map[] inside the platform

2022-07-18T00:14:37Z

This moves protection_map[] inside the platform and while here, also enable ARCH_HAS_VM_GET_PAGE_PROT on 32 bit and nohash 64 (aka book3e/64) platforms via DECLARE_VM_GET_PAGE_PROT. Link: https://lkml.kernel.org/r/20220711070600.2378316-4-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual Reviewed-by: Christophe Leroy Cc: Michael Ellerman Cc: Paul Mackerras Cc: Nicholas Piggin Cc: Arnd Bergmann Cc: Brian Cain Cc: Catalin Marinas Cc: Christoph Hellwig Cc: Christoph Hellwig Cc: Chris Zankel Cc: "David S. Miller" Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Heiko Carstens Cc: Huacai Chen Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Jeff Dike Cc: Jonas Bonn Cc: Michal Simek Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Richard Henderson Cc: Rich Felker Cc: Russell King Cc: Sam Ravnborg Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: WANG Xuerui Cc: Will Deacon Cc: Yoshinori Sato Signed-off-by: Andrew Morton

powerpc: Fix all occurences of "the the"

2022-05-22T05:59:43Z

Rather than waiting for the bots to fix these one-by-one, fix all occurences of "the the" throughout arch/powerpc. Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220518142629.513007-1-mpe@ellerman.id.au

powerpc/fixmap: Fix VM debug warning on unmap

2022-01-24T06:29:05Z

Unmapping a fixmap entry is done by calling __set_fixmap() with FIXMAP_PAGE_CLEAR as flags. Today, powerpc __set_fixmap() calls map_kernel_page(). map_kernel_page() is not happy when called a second time for the same page. WARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8 CPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682 NIP: c0017cd4 LR: c00187f0 CTR: 00000010 REGS: e1011d50 TRAP: 0700 Not tainted (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty) MSR: 00029032 CR: 42000208 XER: 00000000 GPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c GPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000 GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 GPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000 NIP [c0017cd4] set_pte_at+0xc/0x1e8 LR [c00187f0] map_kernel_page+0x9c/0x100 Call Trace: [e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (unreliable) [e1011e30] [c0165fec] __set_fixmap+0x30/0x44 [e1011e40] [c0c13bdc] early_iounmap+0x11c/0x170 [e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0 [e1011e90] [c0c03634] do_one_initcall+0x80/0x178 [e1011ef0] [c0c0385c] kernel_init_freeable+0xb4/0x250 [e1011f20] [c0007e34] kernel_init+0x24/0x140 [e1011f30] [c0016268] ret_from_kernel_thread+0x5c/0x64 Instruction dump: 7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010 4e800020 81250000 712a0001 41820008 <0fe00000> 9421ffe0 93e1001c 48000030 Implement unmap_kernel_page() which clears an existing pte. Reported-by: Maxime Bizon Signed-off-by: Christophe Leroy Tested-by: Maxime Bizon Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b0b752f6f6ecc60653e873f385c6f0dce4e9ab6a.1638789098.git.christophe.leroy@csgroup.eu

powerpc/64s: Fix radix MMU when MMU_FTR_HPTE_TABLE is clear

2021-12-09T11:40:24Z

There are a few places that require MMU_FTR_HPTE_TABLE to be set even when running in radix mode. Fix those up. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20211201144153.2456614-15-npiggin@gmail.com

powerpc/32: Don't use a struct based type for pte_t

2021-10-22T04:22:06Z

Long time ago we had a config item called STRICT_MM_TYPECHECKS to build the kernel with pte_t defined as a structure in order to perform additional build checks or build it with pte_t defined as a simple type in order to get simpler generated code. Commit 670eea924198 ("powerpc/mm: Always use STRICT_MM_TYPECHECKS") made the struct based definition the only one, considering that the generated code was similar in both cases. That's right on ppc64 because the ABI is such that the content of a struct having a single simple type element is passed as register, but on ppc32 such a structure is passed via the stack like any structure. Simple test function: pte_t test(pte_t pte) { return pte; } Before this patch we get c00108ec : c00108ec: 81 24 00 00 lwz r9,0(r4) c00108f0: 91 23 00 00 stw r9,0(r3) c00108f4: 4e 80 00 20 blr So, for PPC32, restore the simple type behaviour we got before commit 670eea924198, but instead of adding a config option to activate type check, do it when __CHECKER__ is set so that type checking is performed by 'sparse' and provides feedback like: arch/powerpc/mm/pgtable.c:466:16: warning: incorrect type in return expression (different base types) arch/powerpc/mm/pgtable.c:466:16: expected unsigned long arch/powerpc/mm/pgtable.c:466:16: got struct pte_t [usertype] x With this patch we now get c0010890 : c0010890: 4e 80 00 20 blr Signed-off-by: Christophe Leroy [mpe: Define STRICT_MM_TYPECHECKS rather than repeating the condition] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/c904599f33aaf6bb7ee2836a9ff8368509e0d78d.1631887042.git.christophe.leroy@csgroup.eu

powerpc/64s: Fix boot failure with 4K Radix

2021-06-24T14:06:54Z

When using the Radix MMU our PGD is always 64K, and must be naturally aligned. For a 4K page size kernel that means page alignment of swapper_pg_dir is not sufficient, leading to failure to boot. Use the existing MAX_PTRS_PER_PGD which has the correct value, and avoids us hard-coding 64K here. Fixes: e72421a085a8 ("powerpc: Define swapper_pg_dir[] in C") Reported-by: Daniel Axtens Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210624123420.2784187-1-mpe@ellerman.id.au

powerpc: Define swapper_pg_dir[] in C

2021-06-16T14:09:10Z

Don't duplicate swapper_pg_dir[] in each platform's head.S Define it in mm/pgtable.c Define MAX_PTRS_PER_PGD because on book3s/64 PTRS_PER_PGD is not a constant. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/5e3f1b8a4695c33ccc80aa3870e016bef32b85e1.1623063174.git.christophe.leroy@csgroup.eu

powerpc/mm: Add PG_dcache_clean to indicate dcache clean state

2021-02-11T12:35:06Z

This just add a better name for PG_arch_1. No functional change in this patch. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210203045812.234439-2-aneesh.kumar@linux.ibm.com

powerpc/mm: Include __find_linux_pte() prototype

2021-01-30T00:39:26Z

It fixes this W=1 compile error : ../arch/powerpc/mm/pgtable.c:337:8: error: no previous prototype for ‘__find_linux_pte’ [-Werror=missing-prototypes] 337 | pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea, | ^~~~~~~~~~~~~~~~ Signed-off-by: Cédric Le Goater Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210104143206.695198-2-clg@kaod.org

Merge tag 'powerpc-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2020-10-16T19:21:15Z

Pull powerpc updates from Michael Ellerman: - A series from Nick adding ARCH_WANT_IRQS_OFF_ACTIVATE_MM & selecting it for powerpc, as well as a related fix for sparc. - Remove support for PowerPC 601. - Some fixes for watchpoints & addition of a new ptrace flag for detecting ISA v3.1 (Power10) watchpoint features. - A fix for kernels using 4K pages and the hash MMU on bare metal Power9 systems with > 16TB of RAM, or RAM on the 2nd node. - A basic idle driver for shallow stop states on Power10. - Tweaks to our sched domains code to better inform the scheduler about the hardware topology on Power9/10, where two SMT4 cores can be presented by firmware as an SMT8 core. - A series doing further reworks & cleanups of our EEH code. - Addition of a filter for RTAS (firmware) calls done via sys_rtas(), to prevent root from overwriting kernel memory. - Other smaller features, fixes & cleanups. Thanks to: Alexey Kardashevskiy, Andrew Donnellan, Aneesh Kumar K.V, Athira Rajeev, Biwen Li, Cameron Berkenpas, Cédric Le Goater, Christophe Leroy, Christoph Hellwig, Colin Ian King, Daniel Axtens, David Dai, Finn Thain, Frederic Barrat, Gautham R. Shenoy, Greg Kurz, Gustavo Romero, Ira Weiny, Jason Yan, Joel Stanley, Jordan Niethe, Kajol Jain, Konrad Rzeszutek Wilk, Laurent Dufour, Leonardo Bras, Liu Shixin, Luca Ceresoli, Madhavan Srinivasan, Mahesh Salgaonkar, Nathan Lynch, Nicholas Mc Guire, Nicholas Piggin, Nick Desaulniers, Oliver O'Halloran, Pedro Miraglia Franco de Carvalho, Pratik Rajesh Sampat, Qian Cai, Qinglang Miao, Ravi Bangoria, Russell Currey, Satheesh Rajendran, Scott Cheloha, Segher Boessenkool, Srikar Dronamraju, Stan Johnson, Stephen Kitt, Stephen Rothwell, Thiago Jung Bauermann, Tyrel Datwyler, Vaibhav Jain, Vaidyanathan Srinivasan, Vasant Hegde, Wang Wensheng, Wolfram Sang, Yang Yingliang, zhengbin. * tag 'powerpc-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (228 commits) Revert "powerpc/pci: unmap legacy INTx interrupts when a PHB is removed" selftests/powerpc: Fix eeh-basic.sh exit codes cpufreq: powernv: Fix frame-size-overflow in powernv_cpufreq_reboot_notifier powerpc/time: Make get_tb() common to PPC32 and PPC64 powerpc/time: Make get_tbl() common to PPC32 and PPC64 powerpc/time: Remove get_tbu() powerpc/time: Avoid using get_tbl() and get_tbu() internally powerpc/time: Make mftb() common to PPC32 and PPC64 powerpc/time: Rename mftbl() to mftb() powerpc/32s: Remove #ifdef CONFIG_PPC_BOOK3S_32 in head_book3s_32.S powerpc/32s: Rename head_32.S to head_book3s_32.S powerpc/32s: Setup the early hash table at all time. powerpc/time: Remove ifdef in get_dec() and set_dec() powerpc: Remove get_tb_or_rtc() powerpc: Remove __USE_RTC() powerpc: Tidy up a bit after removal of PowerPC 601. powerpc: Remove support for PowerPC 601 powerpc: Remove PowerPC 601 powerpc: Drop SYNC_601() ISYNC_601() and SYNC() powerpc: Remove CONFIG_PPC601_SYNC_FIX ...