Messages in this thread Patch in this message |  | | From | Zong Li <> | Subject | [PATCH 1/2] riscv: Register System RAM as iomem resources | Date | Tue, 16 Jun 2020 15:45:46 +0800 |
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Add System RAM to /proc/iomem, various tools expect it such as kdump. It is also needed for page_is_ram API which checks the specified address whether registered as System RAM in iomem_resource list.
Signed-off-by: Zong Li <zong.li@sifive.com> --- arch/riscv/mm/init.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index f4adb3684f3d..bbe816e03b2f 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -517,6 +517,27 @@ void mark_rodata_ro(void) } #endif +void __init resource_init(void) +{ + struct memblock_region *region; + + for_each_memblock(memory, region) { + struct resource *res; + + res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); + if (!res) + panic("%s: Failed to allocate %zu bytes\n", __func__, + sizeof(struct resource)); + + res->name = "System RAM"; + res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); + res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; + res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + + request_resource(&iomem_resource, res); + } +} + void __init paging_init(void) { setup_vm_final(); @@ -524,6 +545,7 @@ void __init paging_init(void) sparse_init(); setup_zero_page(); zone_sizes_init(); + resource_init(); } #ifdef CONFIG_SPARSEMEM_VMEMMAP -- 2.27.0
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