03e92a5e09
The ia64 implementation of __early_pfn_to_nid() essentially relies on the same data as the generic implementation. The correspondence between memory ranges and nodes is set in memblock during early memory initialization in register_active_ranges() function. The initialization of sparsemem that requires early_pfn_to_nid() happens later and it can use the memblock information like the other architectures. Link: https://lkml.kernel.org/r/20201101170454.9567-3-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matt Turner <mattst88@gmail.com> Cc: Meelis Roos <mroos@linux.ee> Cc: Michael Schmitz <schmitzmic@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* This file contains NUMA specific variables and functions which can
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* be split away from DISCONTIGMEM and are used on NUMA machines with
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* contiguous memory.
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*
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* 2002/08/07 Erich Focht <efocht@ess.nec.de>
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*/
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/node.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <linux/module.h>
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#include <asm/mmzone.h>
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#include <asm/numa.h>
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/*
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* The following structures are usually initialized by ACPI or
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* similar mechanisms and describe the NUMA characteristics of the machine.
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*/
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int num_node_memblks;
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struct node_memblk_s node_memblk[NR_NODE_MEMBLKS];
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struct node_cpuid_s node_cpuid[NR_CPUS] =
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{ [0 ... NR_CPUS-1] = { .phys_id = 0, .nid = NUMA_NO_NODE } };
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/*
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* This is a matrix with "distances" between nodes, they should be
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* proportional to the memory access latency ratios.
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*/
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u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
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int __node_distance(int from, int to)
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{
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return slit_distance(from, to);
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}
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EXPORT_SYMBOL(__node_distance);
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/* Identify which cnode a physical address resides on */
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int
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paddr_to_nid(unsigned long paddr)
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{
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int i;
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for (i = 0; i < num_node_memblks; i++)
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if (paddr >= node_memblk[i].start_paddr &&
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paddr < node_memblk[i].start_paddr + node_memblk[i].size)
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break;
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return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
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}
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EXPORT_SYMBOL(paddr_to_nid);
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#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA)
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void numa_clear_node(int cpu)
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{
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unmap_cpu_from_node(cpu, NUMA_NO_NODE);
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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/*
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* SRAT information is stored in node_memblk[], then we can use SRAT
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* information at memory-hot-add if necessary.
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*/
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int memory_add_physaddr_to_nid(u64 addr)
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{
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int nid = paddr_to_nid(addr);
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if (nid < 0)
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return 0;
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return nid;
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}
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#endif
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#endif
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