diff options
| author | Zong Li <zong.li@sifive.com> | 2020-06-16 15:45:46 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-07-09 12:42:02 -0700 |
| commit | 526fbaed33e8eac89634a676e5f8e3b41dfae66e (patch) | |
| tree | b439875c71e29e2d12172803ff57a3d0181ff835 /arch/riscv/mm | |
| parent | a2693fe254e77055cb80571fa2d723021dd3aa1d (diff) | |
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 <zong.li@sifive.com>
[Palmer: check MEMBLOCK_NOMAP]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/mm')
| -rw-r--r-- | arch/riscv/mm/init.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index f4adb3684f3d..92002952c621 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 |