kernel.git/arch/arm/include/asm/io.h, branch linux-5.18.y

arm[64]/memremap: don't abuse pfn_valid() to ensure presence of linear map

2022-05-10T00:34:28Z

The semantics of pfn_valid() is to check presence of the memory map for a PFN and not whether a PFN is covered by the linear map. The memory map may be present for NOMAP memory regions, but they won't be mapped in the linear mapping. Accessing such regions via __va() when they are memremap()'ed will cause a crash. On v5.4.y the crash happens on qemu-arm with UEFI [1]: <1>[ 0.084476] 8<--- cut here --- <1>[ 0.084595] Unable to handle kernel paging request at virtual address dfb76000 <1>[ 0.084938] pgd = (ptrval) <1>[ 0.085038] [dfb76000] *pgd=5f7fe801, *pte=00000000, *ppte=00000000 ... <4>[ 0.093923] [] (memcpy) from [] (dmi_setup+0x60/0x418) <4>[ 0.094204] [] (dmi_setup) from [] (arm_dmi_init+0x8/0x10) <4>[ 0.094408] [] (arm_dmi_init) from [] (do_one_initcall+0x50/0x228) <4>[ 0.094619] [] (do_one_initcall) from [] (kernel_init_freeable+0x15c/0x1f8) <4>[ 0.094841] [] (kernel_init_freeable) from [] (kernel_init+0x8/0x10c) <4>[ 0.095057] [] (kernel_init) from [] (ret_from_fork+0x14/0x2c) On kernels v5.10.y and newer the same crash won't reproduce on ARM because commit b10d6bca8720 ("arch, drivers: replace for_each_membock() with for_each_mem_range()") changed the way memory regions are registered in the resource tree, but that merely covers up the problem. On ARM64 memory resources registered in yet another way and there the issue of wrong usage of pfn_valid() to ensure availability of the linear map is also covered. Implement arch_memremap_can_ram_remap() on ARM and ARM64 to prevent access to NOMAP regions via the linear mapping in memremap(). Link: https://lore.kernel.org/all/Yl65zxGgFzF1Okac@sirena.org.uk Link: https://lkml.kernel.org/r/20220426060107.7618-1-rppt@kernel.org Signed-off-by: Mike Rapoport Reported-by: "kernelci.org bot" Tested-by: Mark Brown Reviewed-by: Ard Biesheuvel Acked-by: Catalin Marinas Cc: Greg Kroah-Hartman Cc: Mark Brown Cc: Mark-PK Tsai Cc: Russell King Cc: Tony Lindgren Cc: Will Deacon Cc: [5.4+] Signed-off-by: Andrew Morton

arm: ioremap: Remove unused ARM-specific function pci_ioremap_io()

2021-12-07T17:36:16Z

This function is not used by any driver anymore. So completely remove it. Link: https://lore.kernel.org/r/20211124154116.916-6-pali@kernel.org Signed-off-by: Pali Rohár Signed-off-by: Lorenzo Pieralisi Reviewed-by: Russell King (Oracle)

arm: ioremap: Implement standard PCI function pci_remap_iospace()

2021-11-30T11:10:11Z

pci_remap_iospace() is standard PCI core function. Architecture code can reimplement default core implementation if needs custom arch specific functionality. ARM needs custom implementation due to pci_ioremap_set_mem_type() hook which allows ARM platforms to change mem type for iospace. Implement this pci_remap_iospace() function for ARM architecture to correctly handle pci_ioremap_set_mem_type() hook, which allows usage of this standard PCI core function also for platforms which needs different mem type (e.g. Marvell Armada 375, 38x and 39x). Link: https://lore.kernel.org/r/20211124154116.916-2-pali@kernel.org Signed-off-by: Pali Rohár Signed-off-by: Lorenzo Pieralisi Reviewed-by: Russell King (Oracle)

ARM: add __arm_iomem_set_ro() to write-protect ioremapped area

2021-10-19T09:30:56Z

__arm_iomem_set_ro() marks an ioremapped area read-only. This is intended for use with __arm_ioremap_exec() to allow the kernel to write some code into e.g. SRAM and then write-protect it so the kernel doesn't complain about W+X mappings. Tested-by: Fabio Estevam Signed-off-by: Russell King (Oracle)

mm: remove xlate_dev_kmem_ptr()

2021-05-07T07:26:34Z

Since /dev/kmem has been removed, let's remove the xlate_dev_kmem_ptr() leftovers. Link: https://lkml.kernel.org/r/20210324102351.6932-3-david@redhat.com Signed-off-by: David Hildenbrand Acked-by: Geert Uytterhoeven Acked-by: Michal Hocko Cc: Linus Torvalds Cc: Greg Kroah-Hartman Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: Russell King Cc: Brian Cain Cc: Geert Uytterhoeven Cc: Thomas Bogendoerfer Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: Yoshinori Sato Cc: Rich Felker Cc: "David S. Miller" Cc: Arnd Bergmann Cc: David Hildenbrand Cc: Krzysztof Kozlowski Cc: Mikulas Patocka Cc: Luc Van Oostenryck Cc: Mike Rapoport Cc: Palmer Dabbelt Cc: Luis Chamberlain Cc: Greentime Hu Cc: Sebastian Andrzej Siewior Cc: Randy Dunlap Cc: Jiaxun Yang Cc: "Peter Zijlstra (Intel)" Cc: Christophe Leroy Cc: Gerald Schaefer Cc: Niklas Schnelle Cc: Pierre Morel Cc: Ingo Molnar Cc: Kuninori Morimoto Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

arm: Use the generic devmem_is_allowed()

2020-12-11T20:28:24Z

This is exactly the same as the arm64 version, which I recently copied into lib/ for use by the RISC-V port. Reviewed-by: Luis Chamberlain Signed-off-by: Palmer Dabbelt

remove ioremap_nocache and devm_ioremap_nocache

2020-01-06T08:45:59Z

ioremap has provided non-cached semantics by default since the Linux 2.6 days, so remove the additional ioremap_nocache interface. Signed-off-by: Christoph Hellwig Acked-by: Arnd Bergmann

arch: rely on asm-generic/io.h for default ioremap_* definitions

2019-11-11T20:18:19Z

Various architectures that use asm-generic/io.h still defined their own default versions of ioremap_nocache, ioremap_wt and ioremap_wc that point back to plain ioremap directly or indirectly. Remove these definitions and rely on asm-generic/io.h instead. For this to work the backup ioremap_* defintions needs to be changed to purely cpp macros instea of inlines to cover for architectures like openrisc that only define ioremap after including . Signed-off-by: Christoph Hellwig Reviewed-by: Arnd Bergmann Reviewed-by: Palmer Dabbelt

arm: remove ioremap_cached

2019-11-11T16:19:40Z

No users of ioremap_cached are left, remove it. Signed-off-by: Christoph Hellwig Reviewed-by: Arnd Bergmann

arch/*: remove unused isa_page_to_bus()

2019-07-17T02:23:22Z

isa_page_to_bus() is deprecated and is no longer used anywhere. Remove it entirely. Link: http://lkml.kernel.org/r/20190613161155.16946-1-steve@sk2.org Signed-off-by: Stephen Kitt Acked-by: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds