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arm: Use the generic devmem_is_allowed()
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 <mcgrof@kernel.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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3 changed files with 1 additions and 24 deletions
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@ -5,7 +5,6 @@ config ARM
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select ARCH_32BIT_OFF_T
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select ARCH_HAS_BINFMT_FLAT
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select ARCH_HAS_DEBUG_VIRTUAL if MMU
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select ARCH_HAS_DEVMEM_IS_ALLOWED
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select ARCH_HAS_DMA_WRITE_COMBINE if !ARM_DMA_MEM_BUFFERABLE
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select ARCH_HAS_ELF_RANDOMIZE
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select ARCH_HAS_FORTIFY_SOURCE
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@ -55,6 +54,7 @@ config ARM
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select GENERIC_IRQ_PROBE
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select GENERIC_IRQ_SHOW
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select GENERIC_IRQ_SHOW_LEVEL
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select GENERIC_LIB_DEVMEM_IS_ALLOWED
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select GENERIC_PCI_IOMAP
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select GENERIC_SCHED_CLOCK
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select GENERIC_SMP_IDLE_THREAD
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@ -441,7 +441,6 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
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#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
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extern int valid_phys_addr_range(phys_addr_t addr, size_t size);
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extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
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extern int devmem_is_allowed(unsigned long pfn);
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#endif
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/*
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@ -165,25 +165,3 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size)
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{
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return (pfn + (size >> PAGE_SHIFT)) <= (1 + (PHYS_MASK >> PAGE_SHIFT));
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}
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#ifdef CONFIG_STRICT_DEVMEM
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#include <linux/ioport.h>
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/*
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* devmem_is_allowed() checks to see if /dev/mem access to a certain
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* address is valid. The argument is a physical page number.
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* We mimic x86 here by disallowing access to system RAM as well as
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* device-exclusive MMIO regions. This effectively disable read()/write()
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* on /dev/mem.
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*/
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int devmem_is_allowed(unsigned long pfn)
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{
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if (iomem_is_exclusive(pfn << PAGE_SHIFT))
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return 0;
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if (!page_is_ram(pfn))
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return 1;
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return 0;
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}
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#endif
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