Unverified Commit 526fbaed authored by Zong Li's avatar Zong Li Committed by Palmer Dabbelt
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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: default avatarZong Li <zong.li@sifive.com>
[Palmer: check MEMBLOCK_NOMAP]
Signed-off-by: default avatarPalmer Dabbelt <palmerdabbelt@google.com>
parent a2693fe2

arch/riscv/mm/init.c

+27 −0
Original line number Diff line number Diff line
@@ -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

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