mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
5a148af669
Pull powerpc update from Benjamin Herrenschmidt: "The main highlights this time around are: - A pile of addition POWER8 bits and nits, such as updated performance counter support (Michael Ellerman), new branch history buffer support (Anshuman Khandual), base support for the new PCI host bridge when not using the hypervisor (Gavin Shan) and other random related bits and fixes from various contributors. - Some rework of our page table format by Aneesh Kumar which fixes a thing or two and paves the way for THP support. THP itself will not make it this time around however. - More Freescale updates, including Altivec support on the new e6500 cores, new PCI controller support, and a pile of new boards support and updates. - The usual batch of trivial cleanups & fixes" * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (156 commits) powerpc: Fix build error for book3e powerpc: Context switch the new EBB SPRs powerpc: Turn on the EBB H/FSCR bits powerpc: Replace CPU_FTR_BCTAR with CPU_FTR_ARCH_207S powerpc: Setup BHRB instructions facility in HFSCR for POWER8 powerpc: Fix interrupt range check on debug exception powerpc: Update tlbie/tlbiel as per ISA doc powerpc: Print page size info during boot powerpc: print both base and actual page size on hash failure powerpc: Fix hpte_decode to use the correct decoding for page sizes powerpc: Decode the pte-lp-encoding bits correctly. powerpc: Use encode avpn where we need only avpn values powerpc: Reduce PTE table memory wastage powerpc: Move the pte free routines from common header powerpc: Reduce the PTE_INDEX_SIZE powerpc: Switch 16GB and 16MB explicit hugepages to a different page table format powerpc: New hugepage directory format powerpc: Don't truncate pgd_index wrongly powerpc: Don't hard code the size of pte page powerpc: Save DAR and DSISR in pt_regs on MCE ...
1674 lines
40 KiB
C
1674 lines
40 KiB
C
/*
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* pSeries NUMA support
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*
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* Copyright (C) 2002 Anton Blanchard <anton@au.ibm.com>, IBM
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/threads.h>
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#include <linux/bootmem.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/export.h>
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#include <linux/nodemask.h>
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#include <linux/cpu.h>
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#include <linux/notifier.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <linux/pfn.h>
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#include <linux/cpuset.h>
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#include <linux/node.h>
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#include <linux/stop_machine.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <asm/sparsemem.h>
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#include <asm/prom.h>
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#include <asm/smp.h>
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#include <asm/firmware.h>
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#include <asm/paca.h>
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#include <asm/hvcall.h>
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#include <asm/setup.h>
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#include <asm/vdso.h>
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static int numa_enabled = 1;
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static char *cmdline __initdata;
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static int numa_debug;
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#define dbg(args...) if (numa_debug) { printk(KERN_INFO args); }
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int numa_cpu_lookup_table[NR_CPUS];
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cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
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struct pglist_data *node_data[MAX_NUMNODES];
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EXPORT_SYMBOL(numa_cpu_lookup_table);
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EXPORT_SYMBOL(node_to_cpumask_map);
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EXPORT_SYMBOL(node_data);
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static int min_common_depth;
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static int n_mem_addr_cells, n_mem_size_cells;
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static int form1_affinity;
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#define MAX_DISTANCE_REF_POINTS 4
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static int distance_ref_points_depth;
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static const unsigned int *distance_ref_points;
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static int distance_lookup_table[MAX_NUMNODES][MAX_DISTANCE_REF_POINTS];
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/*
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* Allocate node_to_cpumask_map based on number of available nodes
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* Requires node_possible_map to be valid.
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*
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* Note: cpumask_of_node() is not valid until after this is done.
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*/
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static void __init setup_node_to_cpumask_map(void)
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{
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unsigned int node;
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/* setup nr_node_ids if not done yet */
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if (nr_node_ids == MAX_NUMNODES)
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setup_nr_node_ids();
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/* allocate the map */
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for (node = 0; node < nr_node_ids; node++)
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alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
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/* cpumask_of_node() will now work */
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dbg("Node to cpumask map for %d nodes\n", nr_node_ids);
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}
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static int __init fake_numa_create_new_node(unsigned long end_pfn,
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unsigned int *nid)
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{
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unsigned long long mem;
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char *p = cmdline;
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static unsigned int fake_nid;
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static unsigned long long curr_boundary;
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/*
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* Modify node id, iff we started creating NUMA nodes
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* We want to continue from where we left of the last time
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*/
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if (fake_nid)
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*nid = fake_nid;
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/*
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* In case there are no more arguments to parse, the
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* node_id should be the same as the last fake node id
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* (we've handled this above).
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*/
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if (!p)
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return 0;
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mem = memparse(p, &p);
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if (!mem)
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return 0;
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if (mem < curr_boundary)
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return 0;
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curr_boundary = mem;
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if ((end_pfn << PAGE_SHIFT) > mem) {
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/*
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* Skip commas and spaces
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*/
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while (*p == ',' || *p == ' ' || *p == '\t')
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p++;
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cmdline = p;
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fake_nid++;
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*nid = fake_nid;
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dbg("created new fake_node with id %d\n", fake_nid);
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return 1;
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}
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return 0;
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}
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/*
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* get_node_active_region - Return active region containing pfn
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* Active range returned is empty if none found.
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* @pfn: The page to return the region for
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* @node_ar: Returned set to the active region containing @pfn
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*/
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static void __init get_node_active_region(unsigned long pfn,
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struct node_active_region *node_ar)
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{
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unsigned long start_pfn, end_pfn;
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int i, nid;
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for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
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if (pfn >= start_pfn && pfn < end_pfn) {
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node_ar->nid = nid;
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node_ar->start_pfn = start_pfn;
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node_ar->end_pfn = end_pfn;
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break;
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}
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}
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}
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static void map_cpu_to_node(int cpu, int node)
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{
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numa_cpu_lookup_table[cpu] = node;
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dbg("adding cpu %d to node %d\n", cpu, node);
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if (!(cpumask_test_cpu(cpu, node_to_cpumask_map[node])))
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cpumask_set_cpu(cpu, node_to_cpumask_map[node]);
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}
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#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_PPC_SPLPAR)
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static void unmap_cpu_from_node(unsigned long cpu)
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{
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int node = numa_cpu_lookup_table[cpu];
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dbg("removing cpu %lu from node %d\n", cpu, node);
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if (cpumask_test_cpu(cpu, node_to_cpumask_map[node])) {
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cpumask_clear_cpu(cpu, node_to_cpumask_map[node]);
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} else {
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printk(KERN_ERR "WARNING: cpu %lu not found in node %d\n",
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cpu, node);
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}
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}
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#endif /* CONFIG_HOTPLUG_CPU || CONFIG_PPC_SPLPAR */
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/* must hold reference to node during call */
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static const int *of_get_associativity(struct device_node *dev)
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{
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return of_get_property(dev, "ibm,associativity", NULL);
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}
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/*
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* Returns the property linux,drconf-usable-memory if
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* it exists (the property exists only in kexec/kdump kernels,
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* added by kexec-tools)
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*/
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static const u32 *of_get_usable_memory(struct device_node *memory)
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{
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const u32 *prop;
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u32 len;
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prop = of_get_property(memory, "linux,drconf-usable-memory", &len);
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if (!prop || len < sizeof(unsigned int))
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return 0;
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return prop;
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}
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int __node_distance(int a, int b)
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{
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int i;
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int distance = LOCAL_DISTANCE;
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if (!form1_affinity)
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return ((a == b) ? LOCAL_DISTANCE : REMOTE_DISTANCE);
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for (i = 0; i < distance_ref_points_depth; i++) {
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if (distance_lookup_table[a][i] == distance_lookup_table[b][i])
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break;
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/* Double the distance for each NUMA level */
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distance *= 2;
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}
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return distance;
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}
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static void initialize_distance_lookup_table(int nid,
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const unsigned int *associativity)
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{
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int i;
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if (!form1_affinity)
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return;
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for (i = 0; i < distance_ref_points_depth; i++) {
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distance_lookup_table[nid][i] =
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associativity[distance_ref_points[i]];
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}
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}
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/* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
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* info is found.
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*/
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static int associativity_to_nid(const unsigned int *associativity)
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{
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int nid = -1;
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if (min_common_depth == -1)
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goto out;
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if (associativity[0] >= min_common_depth)
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nid = associativity[min_common_depth];
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/* POWER4 LPAR uses 0xffff as invalid node */
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if (nid == 0xffff || nid >= MAX_NUMNODES)
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nid = -1;
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if (nid > 0 && associativity[0] >= distance_ref_points_depth)
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initialize_distance_lookup_table(nid, associativity);
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out:
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return nid;
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}
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/* Returns the nid associated with the given device tree node,
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* or -1 if not found.
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*/
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static int of_node_to_nid_single(struct device_node *device)
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{
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int nid = -1;
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const unsigned int *tmp;
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tmp = of_get_associativity(device);
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if (tmp)
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nid = associativity_to_nid(tmp);
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return nid;
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}
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/* Walk the device tree upwards, looking for an associativity id */
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int of_node_to_nid(struct device_node *device)
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{
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struct device_node *tmp;
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int nid = -1;
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of_node_get(device);
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while (device) {
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nid = of_node_to_nid_single(device);
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if (nid != -1)
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break;
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tmp = device;
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device = of_get_parent(tmp);
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of_node_put(tmp);
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}
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of_node_put(device);
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return nid;
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}
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EXPORT_SYMBOL_GPL(of_node_to_nid);
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static int __init find_min_common_depth(void)
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{
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int depth;
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struct device_node *root;
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if (firmware_has_feature(FW_FEATURE_OPAL))
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root = of_find_node_by_path("/ibm,opal");
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else
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root = of_find_node_by_path("/rtas");
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if (!root)
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root = of_find_node_by_path("/");
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/*
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* This property is a set of 32-bit integers, each representing
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* an index into the ibm,associativity nodes.
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*
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* With form 0 affinity the first integer is for an SMP configuration
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* (should be all 0's) and the second is for a normal NUMA
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* configuration. We have only one level of NUMA.
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*
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* With form 1 affinity the first integer is the most significant
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* NUMA boundary and the following are progressively less significant
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* boundaries. There can be more than one level of NUMA.
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*/
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distance_ref_points = of_get_property(root,
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"ibm,associativity-reference-points",
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&distance_ref_points_depth);
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if (!distance_ref_points) {
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dbg("NUMA: ibm,associativity-reference-points not found.\n");
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goto err;
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}
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distance_ref_points_depth /= sizeof(int);
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if (firmware_has_feature(FW_FEATURE_OPAL) ||
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firmware_has_feature(FW_FEATURE_TYPE1_AFFINITY)) {
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dbg("Using form 1 affinity\n");
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form1_affinity = 1;
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}
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if (form1_affinity) {
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depth = distance_ref_points[0];
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} else {
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if (distance_ref_points_depth < 2) {
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printk(KERN_WARNING "NUMA: "
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"short ibm,associativity-reference-points\n");
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goto err;
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}
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depth = distance_ref_points[1];
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}
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/*
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* Warn and cap if the hardware supports more than
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* MAX_DISTANCE_REF_POINTS domains.
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*/
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if (distance_ref_points_depth > MAX_DISTANCE_REF_POINTS) {
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printk(KERN_WARNING "NUMA: distance array capped at "
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"%d entries\n", MAX_DISTANCE_REF_POINTS);
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distance_ref_points_depth = MAX_DISTANCE_REF_POINTS;
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}
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of_node_put(root);
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return depth;
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err:
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of_node_put(root);
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return -1;
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}
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static void __init get_n_mem_cells(int *n_addr_cells, int *n_size_cells)
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{
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struct device_node *memory = NULL;
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memory = of_find_node_by_type(memory, "memory");
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if (!memory)
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panic("numa.c: No memory nodes found!");
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*n_addr_cells = of_n_addr_cells(memory);
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*n_size_cells = of_n_size_cells(memory);
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of_node_put(memory);
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}
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static unsigned long read_n_cells(int n, const unsigned int **buf)
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{
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unsigned long result = 0;
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while (n--) {
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result = (result << 32) | **buf;
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(*buf)++;
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}
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return result;
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}
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/*
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* Read the next memblock list entry from the ibm,dynamic-memory property
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* and return the information in the provided of_drconf_cell structure.
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*/
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static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp)
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{
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const u32 *cp;
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drmem->base_addr = read_n_cells(n_mem_addr_cells, cellp);
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cp = *cellp;
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drmem->drc_index = cp[0];
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drmem->reserved = cp[1];
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drmem->aa_index = cp[2];
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drmem->flags = cp[3];
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*cellp = cp + 4;
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}
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/*
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* Retrieve and validate the ibm,dynamic-memory property of the device tree.
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*
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* The layout of the ibm,dynamic-memory property is a number N of memblock
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* list entries followed by N memblock list entries. Each memblock list entry
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* contains information as laid out in the of_drconf_cell struct above.
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*/
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static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
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{
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const u32 *prop;
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u32 len, entries;
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prop = of_get_property(memory, "ibm,dynamic-memory", &len);
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if (!prop || len < sizeof(unsigned int))
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return 0;
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entries = *prop++;
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|
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/* Now that we know the number of entries, revalidate the size
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* of the property read in to ensure we have everything
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*/
|
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if (len < (entries * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int))
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return 0;
|
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|
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*dm = prop;
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return entries;
|
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}
|
|
|
|
/*
|
|
* Retrieve and validate the ibm,lmb-size property for drconf memory
|
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* from the device tree.
|
|
*/
|
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static u64 of_get_lmb_size(struct device_node *memory)
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{
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const u32 *prop;
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u32 len;
|
|
|
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prop = of_get_property(memory, "ibm,lmb-size", &len);
|
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if (!prop || len < sizeof(unsigned int))
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return 0;
|
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|
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return read_n_cells(n_mem_size_cells, &prop);
|
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}
|
|
|
|
struct assoc_arrays {
|
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u32 n_arrays;
|
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u32 array_sz;
|
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const u32 *arrays;
|
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};
|
|
|
|
/*
|
|
* Retrieve and validate the list of associativity arrays for drconf
|
|
* memory from the ibm,associativity-lookup-arrays property of the
|
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* device tree..
|
|
*
|
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* The layout of the ibm,associativity-lookup-arrays property is a number N
|
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* indicating the number of associativity arrays, followed by a number M
|
|
* indicating the size of each associativity array, followed by a list
|
|
* of N associativity arrays.
|
|
*/
|
|
static int of_get_assoc_arrays(struct device_node *memory,
|
|
struct assoc_arrays *aa)
|
|
{
|
|
const u32 *prop;
|
|
u32 len;
|
|
|
|
prop = of_get_property(memory, "ibm,associativity-lookup-arrays", &len);
|
|
if (!prop || len < 2 * sizeof(unsigned int))
|
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return -1;
|
|
|
|
aa->n_arrays = *prop++;
|
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aa->array_sz = *prop++;
|
|
|
|
/* Now that we know the number of arrays and size of each array,
|
|
* revalidate the size of the property read in.
|
|
*/
|
|
if (len < (aa->n_arrays * aa->array_sz + 2) * sizeof(unsigned int))
|
|
return -1;
|
|
|
|
aa->arrays = prop;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is like of_node_to_nid_single() for memory represented in the
|
|
* ibm,dynamic-reconfiguration-memory node.
|
|
*/
|
|
static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
|
|
struct assoc_arrays *aa)
|
|
{
|
|
int default_nid = 0;
|
|
int nid = default_nid;
|
|
int index;
|
|
|
|
if (min_common_depth > 0 && min_common_depth <= aa->array_sz &&
|
|
!(drmem->flags & DRCONF_MEM_AI_INVALID) &&
|
|
drmem->aa_index < aa->n_arrays) {
|
|
index = drmem->aa_index * aa->array_sz + min_common_depth - 1;
|
|
nid = aa->arrays[index];
|
|
|
|
if (nid == 0xffff || nid >= MAX_NUMNODES)
|
|
nid = default_nid;
|
|
}
|
|
|
|
return nid;
|
|
}
|
|
|
|
/*
|
|
* Figure out to which domain a cpu belongs and stick it there.
|
|
* Return the id of the domain used.
|
|
*/
|
|
static int __cpuinit numa_setup_cpu(unsigned long lcpu)
|
|
{
|
|
int nid = 0;
|
|
struct device_node *cpu = of_get_cpu_node(lcpu, NULL);
|
|
|
|
if (!cpu) {
|
|
WARN_ON(1);
|
|
goto out;
|
|
}
|
|
|
|
nid = of_node_to_nid_single(cpu);
|
|
|
|
if (nid < 0 || !node_online(nid))
|
|
nid = first_online_node;
|
|
out:
|
|
map_cpu_to_node(lcpu, nid);
|
|
|
|
of_node_put(cpu);
|
|
|
|
return nid;
|
|
}
|
|
|
|
static int __cpuinit cpu_numa_callback(struct notifier_block *nfb,
|
|
unsigned long action,
|
|
void *hcpu)
|
|
{
|
|
unsigned long lcpu = (unsigned long)hcpu;
|
|
int ret = NOTIFY_DONE;
|
|
|
|
switch (action) {
|
|
case CPU_UP_PREPARE:
|
|
case CPU_UP_PREPARE_FROZEN:
|
|
numa_setup_cpu(lcpu);
|
|
ret = NOTIFY_OK;
|
|
break;
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
case CPU_UP_CANCELED:
|
|
case CPU_UP_CANCELED_FROZEN:
|
|
unmap_cpu_from_node(lcpu);
|
|
break;
|
|
ret = NOTIFY_OK;
|
|
#endif
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check and possibly modify a memory region to enforce the memory limit.
|
|
*
|
|
* Returns the size the region should have to enforce the memory limit.
|
|
* This will either be the original value of size, a truncated value,
|
|
* or zero. If the returned value of size is 0 the region should be
|
|
* discarded as it lies wholly above the memory limit.
|
|
*/
|
|
static unsigned long __init numa_enforce_memory_limit(unsigned long start,
|
|
unsigned long size)
|
|
{
|
|
/*
|
|
* We use memblock_end_of_DRAM() in here instead of memory_limit because
|
|
* we've already adjusted it for the limit and it takes care of
|
|
* having memory holes below the limit. Also, in the case of
|
|
* iommu_is_off, memory_limit is not set but is implicitly enforced.
|
|
*/
|
|
|
|
if (start + size <= memblock_end_of_DRAM())
|
|
return size;
|
|
|
|
if (start >= memblock_end_of_DRAM())
|
|
return 0;
|
|
|
|
return memblock_end_of_DRAM() - start;
|
|
}
|
|
|
|
/*
|
|
* Reads the counter for a given entry in
|
|
* linux,drconf-usable-memory property
|
|
*/
|
|
static inline int __init read_usm_ranges(const u32 **usm)
|
|
{
|
|
/*
|
|
* For each lmb in ibm,dynamic-memory a corresponding
|
|
* entry in linux,drconf-usable-memory property contains
|
|
* a counter followed by that many (base, size) duple.
|
|
* read the counter from linux,drconf-usable-memory
|
|
*/
|
|
return read_n_cells(n_mem_size_cells, usm);
|
|
}
|
|
|
|
/*
|
|
* Extract NUMA information from the ibm,dynamic-reconfiguration-memory
|
|
* node. This assumes n_mem_{addr,size}_cells have been set.
|
|
*/
|
|
static void __init parse_drconf_memory(struct device_node *memory)
|
|
{
|
|
const u32 *uninitialized_var(dm), *usm;
|
|
unsigned int n, rc, ranges, is_kexec_kdump = 0;
|
|
unsigned long lmb_size, base, size, sz;
|
|
int nid;
|
|
struct assoc_arrays aa = { .arrays = NULL };
|
|
|
|
n = of_get_drconf_memory(memory, &dm);
|
|
if (!n)
|
|
return;
|
|
|
|
lmb_size = of_get_lmb_size(memory);
|
|
if (!lmb_size)
|
|
return;
|
|
|
|
rc = of_get_assoc_arrays(memory, &aa);
|
|
if (rc)
|
|
return;
|
|
|
|
/* check if this is a kexec/kdump kernel */
|
|
usm = of_get_usable_memory(memory);
|
|
if (usm != NULL)
|
|
is_kexec_kdump = 1;
|
|
|
|
for (; n != 0; --n) {
|
|
struct of_drconf_cell drmem;
|
|
|
|
read_drconf_cell(&drmem, &dm);
|
|
|
|
/* skip this block if the reserved bit is set in flags (0x80)
|
|
or if the block is not assigned to this partition (0x8) */
|
|
if ((drmem.flags & DRCONF_MEM_RESERVED)
|
|
|| !(drmem.flags & DRCONF_MEM_ASSIGNED))
|
|
continue;
|
|
|
|
base = drmem.base_addr;
|
|
size = lmb_size;
|
|
ranges = 1;
|
|
|
|
if (is_kexec_kdump) {
|
|
ranges = read_usm_ranges(&usm);
|
|
if (!ranges) /* there are no (base, size) duple */
|
|
continue;
|
|
}
|
|
do {
|
|
if (is_kexec_kdump) {
|
|
base = read_n_cells(n_mem_addr_cells, &usm);
|
|
size = read_n_cells(n_mem_size_cells, &usm);
|
|
}
|
|
nid = of_drconf_to_nid_single(&drmem, &aa);
|
|
fake_numa_create_new_node(
|
|
((base + size) >> PAGE_SHIFT),
|
|
&nid);
|
|
node_set_online(nid);
|
|
sz = numa_enforce_memory_limit(base, size);
|
|
if (sz)
|
|
memblock_set_node(base, sz, nid);
|
|
} while (--ranges);
|
|
}
|
|
}
|
|
|
|
static int __init parse_numa_properties(void)
|
|
{
|
|
struct device_node *memory;
|
|
int default_nid = 0;
|
|
unsigned long i;
|
|
|
|
if (numa_enabled == 0) {
|
|
printk(KERN_WARNING "NUMA disabled by user\n");
|
|
return -1;
|
|
}
|
|
|
|
min_common_depth = find_min_common_depth();
|
|
|
|
if (min_common_depth < 0)
|
|
return min_common_depth;
|
|
|
|
dbg("NUMA associativity depth for CPU/Memory: %d\n", min_common_depth);
|
|
|
|
/*
|
|
* Even though we connect cpus to numa domains later in SMP
|
|
* init, we need to know the node ids now. This is because
|
|
* each node to be onlined must have NODE_DATA etc backing it.
|
|
*/
|
|
for_each_present_cpu(i) {
|
|
struct device_node *cpu;
|
|
int nid;
|
|
|
|
cpu = of_get_cpu_node(i, NULL);
|
|
BUG_ON(!cpu);
|
|
nid = of_node_to_nid_single(cpu);
|
|
of_node_put(cpu);
|
|
|
|
/*
|
|
* Don't fall back to default_nid yet -- we will plug
|
|
* cpus into nodes once the memory scan has discovered
|
|
* the topology.
|
|
*/
|
|
if (nid < 0)
|
|
continue;
|
|
node_set_online(nid);
|
|
}
|
|
|
|
get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);
|
|
|
|
for_each_node_by_type(memory, "memory") {
|
|
unsigned long start;
|
|
unsigned long size;
|
|
int nid;
|
|
int ranges;
|
|
const unsigned int *memcell_buf;
|
|
unsigned int len;
|
|
|
|
memcell_buf = of_get_property(memory,
|
|
"linux,usable-memory", &len);
|
|
if (!memcell_buf || len <= 0)
|
|
memcell_buf = of_get_property(memory, "reg", &len);
|
|
if (!memcell_buf || len <= 0)
|
|
continue;
|
|
|
|
/* ranges in cell */
|
|
ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
|
|
new_range:
|
|
/* these are order-sensitive, and modify the buffer pointer */
|
|
start = read_n_cells(n_mem_addr_cells, &memcell_buf);
|
|
size = read_n_cells(n_mem_size_cells, &memcell_buf);
|
|
|
|
/*
|
|
* Assumption: either all memory nodes or none will
|
|
* have associativity properties. If none, then
|
|
* everything goes to default_nid.
|
|
*/
|
|
nid = of_node_to_nid_single(memory);
|
|
if (nid < 0)
|
|
nid = default_nid;
|
|
|
|
fake_numa_create_new_node(((start + size) >> PAGE_SHIFT), &nid);
|
|
node_set_online(nid);
|
|
|
|
if (!(size = numa_enforce_memory_limit(start, size))) {
|
|
if (--ranges)
|
|
goto new_range;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
memblock_set_node(start, size, nid);
|
|
|
|
if (--ranges)
|
|
goto new_range;
|
|
}
|
|
|
|
/*
|
|
* Now do the same thing for each MEMBLOCK listed in the
|
|
* ibm,dynamic-memory property in the
|
|
* ibm,dynamic-reconfiguration-memory node.
|
|
*/
|
|
memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
|
|
if (memory)
|
|
parse_drconf_memory(memory);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __init setup_nonnuma(void)
|
|
{
|
|
unsigned long top_of_ram = memblock_end_of_DRAM();
|
|
unsigned long total_ram = memblock_phys_mem_size();
|
|
unsigned long start_pfn, end_pfn;
|
|
unsigned int nid = 0;
|
|
struct memblock_region *reg;
|
|
|
|
printk(KERN_DEBUG "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
|
|
top_of_ram, total_ram);
|
|
printk(KERN_DEBUG "Memory hole size: %ldMB\n",
|
|
(top_of_ram - total_ram) >> 20);
|
|
|
|
for_each_memblock(memory, reg) {
|
|
start_pfn = memblock_region_memory_base_pfn(reg);
|
|
end_pfn = memblock_region_memory_end_pfn(reg);
|
|
|
|
fake_numa_create_new_node(end_pfn, &nid);
|
|
memblock_set_node(PFN_PHYS(start_pfn),
|
|
PFN_PHYS(end_pfn - start_pfn), nid);
|
|
node_set_online(nid);
|
|
}
|
|
}
|
|
|
|
void __init dump_numa_cpu_topology(void)
|
|
{
|
|
unsigned int node;
|
|
unsigned int cpu, count;
|
|
|
|
if (min_common_depth == -1 || !numa_enabled)
|
|
return;
|
|
|
|
for_each_online_node(node) {
|
|
printk(KERN_DEBUG "Node %d CPUs:", node);
|
|
|
|
count = 0;
|
|
/*
|
|
* If we used a CPU iterator here we would miss printing
|
|
* the holes in the cpumap.
|
|
*/
|
|
for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
|
|
if (cpumask_test_cpu(cpu,
|
|
node_to_cpumask_map[node])) {
|
|
if (count == 0)
|
|
printk(" %u", cpu);
|
|
++count;
|
|
} else {
|
|
if (count > 1)
|
|
printk("-%u", cpu - 1);
|
|
count = 0;
|
|
}
|
|
}
|
|
|
|
if (count > 1)
|
|
printk("-%u", nr_cpu_ids - 1);
|
|
printk("\n");
|
|
}
|
|
}
|
|
|
|
static void __init dump_numa_memory_topology(void)
|
|
{
|
|
unsigned int node;
|
|
unsigned int count;
|
|
|
|
if (min_common_depth == -1 || !numa_enabled)
|
|
return;
|
|
|
|
for_each_online_node(node) {
|
|
unsigned long i;
|
|
|
|
printk(KERN_DEBUG "Node %d Memory:", node);
|
|
|
|
count = 0;
|
|
|
|
for (i = 0; i < memblock_end_of_DRAM();
|
|
i += (1 << SECTION_SIZE_BITS)) {
|
|
if (early_pfn_to_nid(i >> PAGE_SHIFT) == node) {
|
|
if (count == 0)
|
|
printk(" 0x%lx", i);
|
|
++count;
|
|
} else {
|
|
if (count > 0)
|
|
printk("-0x%lx", i);
|
|
count = 0;
|
|
}
|
|
}
|
|
|
|
if (count > 0)
|
|
printk("-0x%lx", i);
|
|
printk("\n");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Allocate some memory, satisfying the memblock or bootmem allocator where
|
|
* required. nid is the preferred node and end is the physical address of
|
|
* the highest address in the node.
|
|
*
|
|
* Returns the virtual address of the memory.
|
|
*/
|
|
static void __init *careful_zallocation(int nid, unsigned long size,
|
|
unsigned long align,
|
|
unsigned long end_pfn)
|
|
{
|
|
void *ret;
|
|
int new_nid;
|
|
unsigned long ret_paddr;
|
|
|
|
ret_paddr = __memblock_alloc_base(size, align, end_pfn << PAGE_SHIFT);
|
|
|
|
/* retry over all memory */
|
|
if (!ret_paddr)
|
|
ret_paddr = __memblock_alloc_base(size, align, memblock_end_of_DRAM());
|
|
|
|
if (!ret_paddr)
|
|
panic("numa.c: cannot allocate %lu bytes for node %d",
|
|
size, nid);
|
|
|
|
ret = __va(ret_paddr);
|
|
|
|
/*
|
|
* We initialize the nodes in numeric order: 0, 1, 2...
|
|
* and hand over control from the MEMBLOCK allocator to the
|
|
* bootmem allocator. If this function is called for
|
|
* node 5, then we know that all nodes <5 are using the
|
|
* bootmem allocator instead of the MEMBLOCK allocator.
|
|
*
|
|
* So, check the nid from which this allocation came
|
|
* and double check to see if we need to use bootmem
|
|
* instead of the MEMBLOCK. We don't free the MEMBLOCK memory
|
|
* since it would be useless.
|
|
*/
|
|
new_nid = early_pfn_to_nid(ret_paddr >> PAGE_SHIFT);
|
|
if (new_nid < nid) {
|
|
ret = __alloc_bootmem_node(NODE_DATA(new_nid),
|
|
size, align, 0);
|
|
|
|
dbg("alloc_bootmem %p %lx\n", ret, size);
|
|
}
|
|
|
|
memset(ret, 0, size);
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block __cpuinitdata ppc64_numa_nb = {
|
|
.notifier_call = cpu_numa_callback,
|
|
.priority = 1 /* Must run before sched domains notifier. */
|
|
};
|
|
|
|
static void __init mark_reserved_regions_for_nid(int nid)
|
|
{
|
|
struct pglist_data *node = NODE_DATA(nid);
|
|
struct memblock_region *reg;
|
|
|
|
for_each_memblock(reserved, reg) {
|
|
unsigned long physbase = reg->base;
|
|
unsigned long size = reg->size;
|
|
unsigned long start_pfn = physbase >> PAGE_SHIFT;
|
|
unsigned long end_pfn = PFN_UP(physbase + size);
|
|
struct node_active_region node_ar;
|
|
unsigned long node_end_pfn = node->node_start_pfn +
|
|
node->node_spanned_pages;
|
|
|
|
/*
|
|
* Check to make sure that this memblock.reserved area is
|
|
* within the bounds of the node that we care about.
|
|
* Checking the nid of the start and end points is not
|
|
* sufficient because the reserved area could span the
|
|
* entire node.
|
|
*/
|
|
if (end_pfn <= node->node_start_pfn ||
|
|
start_pfn >= node_end_pfn)
|
|
continue;
|
|
|
|
get_node_active_region(start_pfn, &node_ar);
|
|
while (start_pfn < end_pfn &&
|
|
node_ar.start_pfn < node_ar.end_pfn) {
|
|
unsigned long reserve_size = size;
|
|
/*
|
|
* if reserved region extends past active region
|
|
* then trim size to active region
|
|
*/
|
|
if (end_pfn > node_ar.end_pfn)
|
|
reserve_size = (node_ar.end_pfn << PAGE_SHIFT)
|
|
- physbase;
|
|
/*
|
|
* Only worry about *this* node, others may not
|
|
* yet have valid NODE_DATA().
|
|
*/
|
|
if (node_ar.nid == nid) {
|
|
dbg("reserve_bootmem %lx %lx nid=%d\n",
|
|
physbase, reserve_size, node_ar.nid);
|
|
reserve_bootmem_node(NODE_DATA(node_ar.nid),
|
|
physbase, reserve_size,
|
|
BOOTMEM_DEFAULT);
|
|
}
|
|
/*
|
|
* if reserved region is contained in the active region
|
|
* then done.
|
|
*/
|
|
if (end_pfn <= node_ar.end_pfn)
|
|
break;
|
|
|
|
/*
|
|
* reserved region extends past the active region
|
|
* get next active region that contains this
|
|
* reserved region
|
|
*/
|
|
start_pfn = node_ar.end_pfn;
|
|
physbase = start_pfn << PAGE_SHIFT;
|
|
size = size - reserve_size;
|
|
get_node_active_region(start_pfn, &node_ar);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void __init do_init_bootmem(void)
|
|
{
|
|
int nid;
|
|
|
|
min_low_pfn = 0;
|
|
max_low_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
|
|
max_pfn = max_low_pfn;
|
|
|
|
if (parse_numa_properties())
|
|
setup_nonnuma();
|
|
else
|
|
dump_numa_memory_topology();
|
|
|
|
for_each_online_node(nid) {
|
|
unsigned long start_pfn, end_pfn;
|
|
void *bootmem_vaddr;
|
|
unsigned long bootmap_pages;
|
|
|
|
get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
|
|
|
|
/*
|
|
* Allocate the node structure node local if possible
|
|
*
|
|
* Be careful moving this around, as it relies on all
|
|
* previous nodes' bootmem to be initialized and have
|
|
* all reserved areas marked.
|
|
*/
|
|
NODE_DATA(nid) = careful_zallocation(nid,
|
|
sizeof(struct pglist_data),
|
|
SMP_CACHE_BYTES, end_pfn);
|
|
|
|
dbg("node %d\n", nid);
|
|
dbg("NODE_DATA() = %p\n", NODE_DATA(nid));
|
|
|
|
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
|
|
NODE_DATA(nid)->node_start_pfn = start_pfn;
|
|
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
|
|
|
|
if (NODE_DATA(nid)->node_spanned_pages == 0)
|
|
continue;
|
|
|
|
dbg("start_paddr = %lx\n", start_pfn << PAGE_SHIFT);
|
|
dbg("end_paddr = %lx\n", end_pfn << PAGE_SHIFT);
|
|
|
|
bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
|
|
bootmem_vaddr = careful_zallocation(nid,
|
|
bootmap_pages << PAGE_SHIFT,
|
|
PAGE_SIZE, end_pfn);
|
|
|
|
dbg("bootmap_vaddr = %p\n", bootmem_vaddr);
|
|
|
|
init_bootmem_node(NODE_DATA(nid),
|
|
__pa(bootmem_vaddr) >> PAGE_SHIFT,
|
|
start_pfn, end_pfn);
|
|
|
|
free_bootmem_with_active_regions(nid, end_pfn);
|
|
/*
|
|
* Be very careful about moving this around. Future
|
|
* calls to careful_zallocation() depend on this getting
|
|
* done correctly.
|
|
*/
|
|
mark_reserved_regions_for_nid(nid);
|
|
sparse_memory_present_with_active_regions(nid);
|
|
}
|
|
|
|
init_bootmem_done = 1;
|
|
|
|
/*
|
|
* Now bootmem is initialised we can create the node to cpumask
|
|
* lookup tables and setup the cpu callback to populate them.
|
|
*/
|
|
setup_node_to_cpumask_map();
|
|
|
|
register_cpu_notifier(&ppc64_numa_nb);
|
|
cpu_numa_callback(&ppc64_numa_nb, CPU_UP_PREPARE,
|
|
(void *)(unsigned long)boot_cpuid);
|
|
}
|
|
|
|
void __init paging_init(void)
|
|
{
|
|
unsigned long max_zone_pfns[MAX_NR_ZONES];
|
|
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
|
|
max_zone_pfns[ZONE_DMA] = memblock_end_of_DRAM() >> PAGE_SHIFT;
|
|
free_area_init_nodes(max_zone_pfns);
|
|
}
|
|
|
|
static int __init early_numa(char *p)
|
|
{
|
|
if (!p)
|
|
return 0;
|
|
|
|
if (strstr(p, "off"))
|
|
numa_enabled = 0;
|
|
|
|
if (strstr(p, "debug"))
|
|
numa_debug = 1;
|
|
|
|
p = strstr(p, "fake=");
|
|
if (p)
|
|
cmdline = p + strlen("fake=");
|
|
|
|
return 0;
|
|
}
|
|
early_param("numa", early_numa);
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
/*
|
|
* Find the node associated with a hot added memory section for
|
|
* memory represented in the device tree by the property
|
|
* ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory.
|
|
*/
|
|
static int hot_add_drconf_scn_to_nid(struct device_node *memory,
|
|
unsigned long scn_addr)
|
|
{
|
|
const u32 *dm;
|
|
unsigned int drconf_cell_cnt, rc;
|
|
unsigned long lmb_size;
|
|
struct assoc_arrays aa;
|
|
int nid = -1;
|
|
|
|
drconf_cell_cnt = of_get_drconf_memory(memory, &dm);
|
|
if (!drconf_cell_cnt)
|
|
return -1;
|
|
|
|
lmb_size = of_get_lmb_size(memory);
|
|
if (!lmb_size)
|
|
return -1;
|
|
|
|
rc = of_get_assoc_arrays(memory, &aa);
|
|
if (rc)
|
|
return -1;
|
|
|
|
for (; drconf_cell_cnt != 0; --drconf_cell_cnt) {
|
|
struct of_drconf_cell drmem;
|
|
|
|
read_drconf_cell(&drmem, &dm);
|
|
|
|
/* skip this block if it is reserved or not assigned to
|
|
* this partition */
|
|
if ((drmem.flags & DRCONF_MEM_RESERVED)
|
|
|| !(drmem.flags & DRCONF_MEM_ASSIGNED))
|
|
continue;
|
|
|
|
if ((scn_addr < drmem.base_addr)
|
|
|| (scn_addr >= (drmem.base_addr + lmb_size)))
|
|
continue;
|
|
|
|
nid = of_drconf_to_nid_single(&drmem, &aa);
|
|
break;
|
|
}
|
|
|
|
return nid;
|
|
}
|
|
|
|
/*
|
|
* Find the node associated with a hot added memory section for memory
|
|
* represented in the device tree as a node (i.e. memory@XXXX) for
|
|
* each memblock.
|
|
*/
|
|
int hot_add_node_scn_to_nid(unsigned long scn_addr)
|
|
{
|
|
struct device_node *memory;
|
|
int nid = -1;
|
|
|
|
for_each_node_by_type(memory, "memory") {
|
|
unsigned long start, size;
|
|
int ranges;
|
|
const unsigned int *memcell_buf;
|
|
unsigned int len;
|
|
|
|
memcell_buf = of_get_property(memory, "reg", &len);
|
|
if (!memcell_buf || len <= 0)
|
|
continue;
|
|
|
|
/* ranges in cell */
|
|
ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
|
|
|
|
while (ranges--) {
|
|
start = read_n_cells(n_mem_addr_cells, &memcell_buf);
|
|
size = read_n_cells(n_mem_size_cells, &memcell_buf);
|
|
|
|
if ((scn_addr < start) || (scn_addr >= (start + size)))
|
|
continue;
|
|
|
|
nid = of_node_to_nid_single(memory);
|
|
break;
|
|
}
|
|
|
|
if (nid >= 0)
|
|
break;
|
|
}
|
|
|
|
of_node_put(memory);
|
|
|
|
return nid;
|
|
}
|
|
|
|
/*
|
|
* Find the node associated with a hot added memory section. Section
|
|
* corresponds to a SPARSEMEM section, not an MEMBLOCK. It is assumed that
|
|
* sections are fully contained within a single MEMBLOCK.
|
|
*/
|
|
int hot_add_scn_to_nid(unsigned long scn_addr)
|
|
{
|
|
struct device_node *memory = NULL;
|
|
int nid, found = 0;
|
|
|
|
if (!numa_enabled || (min_common_depth < 0))
|
|
return first_online_node;
|
|
|
|
memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
|
|
if (memory) {
|
|
nid = hot_add_drconf_scn_to_nid(memory, scn_addr);
|
|
of_node_put(memory);
|
|
} else {
|
|
nid = hot_add_node_scn_to_nid(scn_addr);
|
|
}
|
|
|
|
if (nid < 0 || !node_online(nid))
|
|
nid = first_online_node;
|
|
|
|
if (NODE_DATA(nid)->node_spanned_pages)
|
|
return nid;
|
|
|
|
for_each_online_node(nid) {
|
|
if (NODE_DATA(nid)->node_spanned_pages) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
BUG_ON(!found);
|
|
return nid;
|
|
}
|
|
|
|
static u64 hot_add_drconf_memory_max(void)
|
|
{
|
|
struct device_node *memory = NULL;
|
|
unsigned int drconf_cell_cnt = 0;
|
|
u64 lmb_size = 0;
|
|
const u32 *dm = 0;
|
|
|
|
memory = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
|
|
if (memory) {
|
|
drconf_cell_cnt = of_get_drconf_memory(memory, &dm);
|
|
lmb_size = of_get_lmb_size(memory);
|
|
of_node_put(memory);
|
|
}
|
|
return lmb_size * drconf_cell_cnt;
|
|
}
|
|
|
|
/*
|
|
* memory_hotplug_max - return max address of memory that may be added
|
|
*
|
|
* This is currently only used on systems that support drconfig memory
|
|
* hotplug.
|
|
*/
|
|
u64 memory_hotplug_max(void)
|
|
{
|
|
return max(hot_add_drconf_memory_max(), memblock_end_of_DRAM());
|
|
}
|
|
#endif /* CONFIG_MEMORY_HOTPLUG */
|
|
|
|
/* Virtual Processor Home Node (VPHN) support */
|
|
#ifdef CONFIG_PPC_SPLPAR
|
|
struct topology_update_data {
|
|
struct topology_update_data *next;
|
|
unsigned int cpu;
|
|
int old_nid;
|
|
int new_nid;
|
|
};
|
|
|
|
static u8 vphn_cpu_change_counts[NR_CPUS][MAX_DISTANCE_REF_POINTS];
|
|
static cpumask_t cpu_associativity_changes_mask;
|
|
static int vphn_enabled;
|
|
static int prrn_enabled;
|
|
static void reset_topology_timer(void);
|
|
|
|
/*
|
|
* Store the current values of the associativity change counters in the
|
|
* hypervisor.
|
|
*/
|
|
static void setup_cpu_associativity_change_counters(void)
|
|
{
|
|
int cpu;
|
|
|
|
/* The VPHN feature supports a maximum of 8 reference points */
|
|
BUILD_BUG_ON(MAX_DISTANCE_REF_POINTS > 8);
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
int i;
|
|
u8 *counts = vphn_cpu_change_counts[cpu];
|
|
volatile u8 *hypervisor_counts = lppaca[cpu].vphn_assoc_counts;
|
|
|
|
for (i = 0; i < distance_ref_points_depth; i++)
|
|
counts[i] = hypervisor_counts[i];
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The hypervisor maintains a set of 8 associativity change counters in
|
|
* the VPA of each cpu that correspond to the associativity levels in the
|
|
* ibm,associativity-reference-points property. When an associativity
|
|
* level changes, the corresponding counter is incremented.
|
|
*
|
|
* Set a bit in cpu_associativity_changes_mask for each cpu whose home
|
|
* node associativity levels have changed.
|
|
*
|
|
* Returns the number of cpus with unhandled associativity changes.
|
|
*/
|
|
static int update_cpu_associativity_changes_mask(void)
|
|
{
|
|
int cpu;
|
|
cpumask_t *changes = &cpu_associativity_changes_mask;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
int i, changed = 0;
|
|
u8 *counts = vphn_cpu_change_counts[cpu];
|
|
volatile u8 *hypervisor_counts = lppaca[cpu].vphn_assoc_counts;
|
|
|
|
for (i = 0; i < distance_ref_points_depth; i++) {
|
|
if (hypervisor_counts[i] != counts[i]) {
|
|
counts[i] = hypervisor_counts[i];
|
|
changed = 1;
|
|
}
|
|
}
|
|
if (changed) {
|
|
cpumask_set_cpu(cpu, changes);
|
|
}
|
|
}
|
|
|
|
return cpumask_weight(changes);
|
|
}
|
|
|
|
/*
|
|
* 6 64-bit registers unpacked into 12 32-bit associativity values. To form
|
|
* the complete property we have to add the length in the first cell.
|
|
*/
|
|
#define VPHN_ASSOC_BUFSIZE (6*sizeof(u64)/sizeof(u32) + 1)
|
|
|
|
/*
|
|
* Convert the associativity domain numbers returned from the hypervisor
|
|
* to the sequence they would appear in the ibm,associativity property.
|
|
*/
|
|
static int vphn_unpack_associativity(const long *packed, unsigned int *unpacked)
|
|
{
|
|
int i, nr_assoc_doms = 0;
|
|
const u16 *field = (const u16*) packed;
|
|
|
|
#define VPHN_FIELD_UNUSED (0xffff)
|
|
#define VPHN_FIELD_MSB (0x8000)
|
|
#define VPHN_FIELD_MASK (~VPHN_FIELD_MSB)
|
|
|
|
for (i = 1; i < VPHN_ASSOC_BUFSIZE; i++) {
|
|
if (*field == VPHN_FIELD_UNUSED) {
|
|
/* All significant fields processed, and remaining
|
|
* fields contain the reserved value of all 1's.
|
|
* Just store them.
|
|
*/
|
|
unpacked[i] = *((u32*)field);
|
|
field += 2;
|
|
} else if (*field & VPHN_FIELD_MSB) {
|
|
/* Data is in the lower 15 bits of this field */
|
|
unpacked[i] = *field & VPHN_FIELD_MASK;
|
|
field++;
|
|
nr_assoc_doms++;
|
|
} else {
|
|
/* Data is in the lower 15 bits of this field
|
|
* concatenated with the next 16 bit field
|
|
*/
|
|
unpacked[i] = *((u32*)field);
|
|
field += 2;
|
|
nr_assoc_doms++;
|
|
}
|
|
}
|
|
|
|
/* The first cell contains the length of the property */
|
|
unpacked[0] = nr_assoc_doms;
|
|
|
|
return nr_assoc_doms;
|
|
}
|
|
|
|
/*
|
|
* Retrieve the new associativity information for a virtual processor's
|
|
* home node.
|
|
*/
|
|
static long hcall_vphn(unsigned long cpu, unsigned int *associativity)
|
|
{
|
|
long rc;
|
|
long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
|
|
u64 flags = 1;
|
|
int hwcpu = get_hard_smp_processor_id(cpu);
|
|
|
|
rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, hwcpu);
|
|
vphn_unpack_associativity(retbuf, associativity);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static long vphn_get_associativity(unsigned long cpu,
|
|
unsigned int *associativity)
|
|
{
|
|
long rc;
|
|
|
|
rc = hcall_vphn(cpu, associativity);
|
|
|
|
switch (rc) {
|
|
case H_FUNCTION:
|
|
printk(KERN_INFO
|
|
"VPHN is not supported. Disabling polling...\n");
|
|
stop_topology_update();
|
|
break;
|
|
case H_HARDWARE:
|
|
printk(KERN_ERR
|
|
"hcall_vphn() experienced a hardware fault "
|
|
"preventing VPHN. Disabling polling...\n");
|
|
stop_topology_update();
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Update the CPU maps and sysfs entries for a single CPU when its NUMA
|
|
* characteristics change. This function doesn't perform any locking and is
|
|
* only safe to call from stop_machine().
|
|
*/
|
|
static int update_cpu_topology(void *data)
|
|
{
|
|
struct topology_update_data *update;
|
|
unsigned long cpu;
|
|
|
|
if (!data)
|
|
return -EINVAL;
|
|
|
|
cpu = get_cpu();
|
|
|
|
for (update = data; update; update = update->next) {
|
|
if (cpu != update->cpu)
|
|
continue;
|
|
|
|
unregister_cpu_under_node(update->cpu, update->old_nid);
|
|
unmap_cpu_from_node(update->cpu);
|
|
map_cpu_to_node(update->cpu, update->new_nid);
|
|
vdso_getcpu_init();
|
|
register_cpu_under_node(update->cpu, update->new_nid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update the node maps and sysfs entries for each cpu whose home node
|
|
* has changed. Returns 1 when the topology has changed, and 0 otherwise.
|
|
*/
|
|
int arch_update_cpu_topology(void)
|
|
{
|
|
unsigned int cpu, changed = 0;
|
|
struct topology_update_data *updates, *ud;
|
|
unsigned int associativity[VPHN_ASSOC_BUFSIZE] = {0};
|
|
cpumask_t updated_cpus;
|
|
struct device *dev;
|
|
int weight, i = 0;
|
|
|
|
weight = cpumask_weight(&cpu_associativity_changes_mask);
|
|
if (!weight)
|
|
return 0;
|
|
|
|
updates = kzalloc(weight * (sizeof(*updates)), GFP_KERNEL);
|
|
if (!updates)
|
|
return 0;
|
|
|
|
cpumask_clear(&updated_cpus);
|
|
|
|
for_each_cpu(cpu, &cpu_associativity_changes_mask) {
|
|
ud = &updates[i++];
|
|
ud->cpu = cpu;
|
|
vphn_get_associativity(cpu, associativity);
|
|
ud->new_nid = associativity_to_nid(associativity);
|
|
|
|
if (ud->new_nid < 0 || !node_online(ud->new_nid))
|
|
ud->new_nid = first_online_node;
|
|
|
|
ud->old_nid = numa_cpu_lookup_table[cpu];
|
|
cpumask_set_cpu(cpu, &updated_cpus);
|
|
|
|
if (i < weight)
|
|
ud->next = &updates[i];
|
|
}
|
|
|
|
stop_machine(update_cpu_topology, &updates[0], &updated_cpus);
|
|
|
|
for (ud = &updates[0]; ud; ud = ud->next) {
|
|
dev = get_cpu_device(ud->cpu);
|
|
if (dev)
|
|
kobject_uevent(&dev->kobj, KOBJ_CHANGE);
|
|
cpumask_clear_cpu(ud->cpu, &cpu_associativity_changes_mask);
|
|
changed = 1;
|
|
}
|
|
|
|
kfree(updates);
|
|
return changed;
|
|
}
|
|
|
|
static void topology_work_fn(struct work_struct *work)
|
|
{
|
|
rebuild_sched_domains();
|
|
}
|
|
static DECLARE_WORK(topology_work, topology_work_fn);
|
|
|
|
void topology_schedule_update(void)
|
|
{
|
|
schedule_work(&topology_work);
|
|
}
|
|
|
|
static void topology_timer_fn(unsigned long ignored)
|
|
{
|
|
if (prrn_enabled && cpumask_weight(&cpu_associativity_changes_mask))
|
|
topology_schedule_update();
|
|
else if (vphn_enabled) {
|
|
if (update_cpu_associativity_changes_mask() > 0)
|
|
topology_schedule_update();
|
|
reset_topology_timer();
|
|
}
|
|
}
|
|
static struct timer_list topology_timer =
|
|
TIMER_INITIALIZER(topology_timer_fn, 0, 0);
|
|
|
|
static void reset_topology_timer(void)
|
|
{
|
|
topology_timer.data = 0;
|
|
topology_timer.expires = jiffies + 60 * HZ;
|
|
mod_timer(&topology_timer, topology_timer.expires);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static void stage_topology_update(int core_id)
|
|
{
|
|
cpumask_or(&cpu_associativity_changes_mask,
|
|
&cpu_associativity_changes_mask, cpu_sibling_mask(core_id));
|
|
reset_topology_timer();
|
|
}
|
|
|
|
static int dt_update_callback(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct of_prop_reconfig *update;
|
|
int rc = NOTIFY_DONE;
|
|
|
|
switch (action) {
|
|
case OF_RECONFIG_UPDATE_PROPERTY:
|
|
update = (struct of_prop_reconfig *)data;
|
|
if (!of_prop_cmp(update->dn->type, "cpu") &&
|
|
!of_prop_cmp(update->prop->name, "ibm,associativity")) {
|
|
u32 core_id;
|
|
of_property_read_u32(update->dn, "reg", &core_id);
|
|
stage_topology_update(core_id);
|
|
rc = NOTIFY_OK;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct notifier_block dt_update_nb = {
|
|
.notifier_call = dt_update_callback,
|
|
};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Start polling for associativity changes.
|
|
*/
|
|
int start_topology_update(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (firmware_has_feature(FW_FEATURE_PRRN)) {
|
|
if (!prrn_enabled) {
|
|
prrn_enabled = 1;
|
|
vphn_enabled = 0;
|
|
#ifdef CONFIG_SMP
|
|
rc = of_reconfig_notifier_register(&dt_update_nb);
|
|
#endif
|
|
}
|
|
} else if (firmware_has_feature(FW_FEATURE_VPHN) &&
|
|
get_lppaca()->shared_proc) {
|
|
if (!vphn_enabled) {
|
|
prrn_enabled = 0;
|
|
vphn_enabled = 1;
|
|
setup_cpu_associativity_change_counters();
|
|
init_timer_deferrable(&topology_timer);
|
|
reset_topology_timer();
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Disable polling for VPHN associativity changes.
|
|
*/
|
|
int stop_topology_update(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (prrn_enabled) {
|
|
prrn_enabled = 0;
|
|
#ifdef CONFIG_SMP
|
|
rc = of_reconfig_notifier_unregister(&dt_update_nb);
|
|
#endif
|
|
} else if (vphn_enabled) {
|
|
vphn_enabled = 0;
|
|
rc = del_timer_sync(&topology_timer);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int prrn_is_enabled(void)
|
|
{
|
|
return prrn_enabled;
|
|
}
|
|
|
|
static int topology_read(struct seq_file *file, void *v)
|
|
{
|
|
if (vphn_enabled || prrn_enabled)
|
|
seq_puts(file, "on\n");
|
|
else
|
|
seq_puts(file, "off\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int topology_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, topology_read, NULL);
|
|
}
|
|
|
|
static ssize_t topology_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *off)
|
|
{
|
|
char kbuf[4]; /* "on" or "off" plus null. */
|
|
int read_len;
|
|
|
|
read_len = count < 3 ? count : 3;
|
|
if (copy_from_user(kbuf, buf, read_len))
|
|
return -EINVAL;
|
|
|
|
kbuf[read_len] = '\0';
|
|
|
|
if (!strncmp(kbuf, "on", 2))
|
|
start_topology_update();
|
|
else if (!strncmp(kbuf, "off", 3))
|
|
stop_topology_update();
|
|
else
|
|
return -EINVAL;
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations topology_ops = {
|
|
.read = seq_read,
|
|
.write = topology_write,
|
|
.open = topology_open,
|
|
.release = single_release
|
|
};
|
|
|
|
static int topology_update_init(void)
|
|
{
|
|
start_topology_update();
|
|
proc_create("powerpc/topology_updates", 644, NULL, &topology_ops);
|
|
|
|
return 0;
|
|
}
|
|
device_initcall(topology_update_init);
|
|
#endif /* CONFIG_PPC_SPLPAR */
|