From 526fbaed33e8eac89634a676e5f8e3b41dfae66e Mon Sep 17 00:00:00 2001 From: Zong Li Date: Tue, 16 Jun 2020 15:45:46 +0800 Subject: [PATCH] riscv: Register System RAM as iomem resources 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 [Palmer: check MEMBLOCK_NOMAP] Signed-off-by: Palmer Dabbelt --- arch/riscv/mm/init.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index f4adb3684f3db..92002952c621d 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -517,6 +517,32 @@ 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)); + + if (memblock_is_nomap(region)) { + res->name = "reserved"; + res->flags = IORESOURCE_MEM; + } else { + res->name = "System RAM"; + res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; + } + res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); + res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; + + request_resource(&iomem_resource, res); + } +} + void __init paging_init(void) { setup_vm_final(); @@ -524,6 +550,7 @@ void __init paging_init(void) sparse_init(); setup_zero_page(); zone_sizes_init(); + resource_init(); } #ifdef CONFIG_SPARSEMEM_VMEMMAP -- 2.30.2