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| author | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-12-11 23:30:26 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-12-11 23:30:26 +0300 |
| commit | 7d95a88f9254b711a3a95106fc73f6a3a9866a40 (patch) | |
| tree | 9c4551d7f2dce744bbefc359b941fd144f66333d /arch/arm | |
| parent | 3ae9c3cde51abcb777125cfcf74cc402f4d0a4c7 (diff) | |
| parent | 6585bd827407f55ee30a782492208bfaf4f52feb (diff) | |
| download | linux-7d95a88f9254b711a3a95106fc73f6a3a9866a40.tar.xz | |
Add and use a generic version of devmem_is_allowed()
As part of adding STRICT_DEVMEM support to the RISC-V port, Zong provided an
implementation of devmem_is_allowed() that's exactly the same as the version in
a handful of other ports. Rather than duplicate code, I've put a generic
version of this in lib/ and used it for the RISC-V port.
* palmer/generic-devmem:
arm64: Use the generic devmem_is_allowed()
arm: Use the generic devmem_is_allowed()
RISC-V: Use the new generic devmem_is_allowed()
lib: Add a generic version of devmem_is_allowed()
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/Kconfig | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/io.h | 1 | ||||
| -rw-r--r-- | arch/arm/mm/mmap.c | 22 |
3 files changed, 1 insertions, 24 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index fe2f17eb2b50..ae7c7364871b 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -5,7 +5,6 @@ config ARM select ARCH_32BIT_OFF_T select ARCH_HAS_BINFMT_FLAT select ARCH_HAS_DEBUG_VIRTUAL if MMU - select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_DMA_WRITE_COMBINE if !ARM_DMA_MEM_BUFFERABLE select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_FORTIFY_SOURCE @@ -56,6 +55,7 @@ config ARM select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_IRQ_SHOW_LEVEL + select GENERIC_LIB_DEVMEM_IS_ALLOWED select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index ab2b654084fa..fc748122f1e0 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -441,7 +441,6 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr); #define ARCH_HAS_VALID_PHYS_ADDR_RANGE extern int valid_phys_addr_range(phys_addr_t addr, size_t size); extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); -extern int devmem_is_allowed(unsigned long pfn); #endif /* diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index b8d912ac9e61..a0f8a0ca0788 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -165,25 +165,3 @@ int valid_mmap_phys_addr_range(unsigned long pfn, size_t size) { return (pfn + (size >> PAGE_SHIFT)) <= (1 + (PHYS_MASK >> PAGE_SHIFT)); } - -#ifdef CONFIG_STRICT_DEVMEM - -#include <linux/ioport.h> - -/* - * devmem_is_allowed() checks to see if /dev/mem access to a certain - * address is valid. The argument is a physical page number. - * We mimic x86 here by disallowing access to system RAM as well as - * device-exclusive MMIO regions. This effectively disable read()/write() - * on /dev/mem. - */ -int devmem_is_allowed(unsigned long pfn) -{ - if (iomem_is_exclusive(pfn << PAGE_SHIFT)) - return 0; - if (!page_is_ram(pfn)) - return 1; - return 0; -} - -#endif |