c9be0a36f9
Passing the attribute to the low level IO functions allows all kinds of cleanups, by sharing low level IO code without requiring an own function for every piece of data. Also drivers can extend the attributes with own data fields and use that in the low level function. Similar to sysdev_attributes and normal attributes. This is a tree-wide sweep, converting everything in one go. No functional changes in this patch other than passing the new argument everywhere. Tested on x86, the non x86 parts are uncompiled. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
634 lines
17 KiB
C
634 lines
17 KiB
C
/*
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* drivers/base/node.c - basic Node class support
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*/
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#include <linux/sysdev.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/memory.h>
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#include <linux/node.h>
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#include <linux/hugetlb.h>
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#include <linux/cpumask.h>
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#include <linux/topology.h>
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#include <linux/nodemask.h>
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#include <linux/cpu.h>
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#include <linux/device.h>
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#include <linux/swap.h>
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static struct sysdev_class node_class = {
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.name = "node",
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};
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static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
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{
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struct node *node_dev = to_node(dev);
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const struct cpumask *mask = cpumask_of_node(node_dev->sysdev.id);
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int len;
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/* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
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BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
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len = type?
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cpulist_scnprintf(buf, PAGE_SIZE-2, mask) :
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cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
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buf[len++] = '\n';
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buf[len] = '\0';
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return len;
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}
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static inline ssize_t node_read_cpumask(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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return node_read_cpumap(dev, 0, buf);
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}
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static inline ssize_t node_read_cpulist(struct sys_device *dev,
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struct sysdev_attribute *attr, char *buf)
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{
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return node_read_cpumap(dev, 1, buf);
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}
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static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL);
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static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
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#define K(x) ((x) << (PAGE_SHIFT - 10))
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static ssize_t node_read_meminfo(struct sys_device * dev,
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struct sysdev_attribute *attr, char * buf)
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{
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int n;
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int nid = dev->id;
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struct sysinfo i;
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si_meminfo_node(&i, nid);
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n = sprintf(buf, "\n"
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"Node %d MemTotal: %8lu kB\n"
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"Node %d MemFree: %8lu kB\n"
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"Node %d MemUsed: %8lu kB\n"
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"Node %d Active: %8lu kB\n"
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"Node %d Inactive: %8lu kB\n"
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"Node %d Active(anon): %8lu kB\n"
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"Node %d Inactive(anon): %8lu kB\n"
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"Node %d Active(file): %8lu kB\n"
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"Node %d Inactive(file): %8lu kB\n"
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"Node %d Unevictable: %8lu kB\n"
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"Node %d Mlocked: %8lu kB\n"
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#ifdef CONFIG_HIGHMEM
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"Node %d HighTotal: %8lu kB\n"
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"Node %d HighFree: %8lu kB\n"
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"Node %d LowTotal: %8lu kB\n"
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"Node %d LowFree: %8lu kB\n"
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#endif
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"Node %d Dirty: %8lu kB\n"
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"Node %d Writeback: %8lu kB\n"
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"Node %d FilePages: %8lu kB\n"
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"Node %d Mapped: %8lu kB\n"
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"Node %d AnonPages: %8lu kB\n"
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"Node %d Shmem: %8lu kB\n"
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"Node %d KernelStack: %8lu kB\n"
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"Node %d PageTables: %8lu kB\n"
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"Node %d NFS_Unstable: %8lu kB\n"
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"Node %d Bounce: %8lu kB\n"
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"Node %d WritebackTmp: %8lu kB\n"
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"Node %d Slab: %8lu kB\n"
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"Node %d SReclaimable: %8lu kB\n"
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"Node %d SUnreclaim: %8lu kB\n",
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nid, K(i.totalram),
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nid, K(i.freeram),
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nid, K(i.totalram - i.freeram),
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nid, K(node_page_state(nid, NR_ACTIVE_ANON) +
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node_page_state(nid, NR_ACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_INACTIVE_ANON) +
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node_page_state(nid, NR_INACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_ACTIVE_ANON)),
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nid, K(node_page_state(nid, NR_INACTIVE_ANON)),
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nid, K(node_page_state(nid, NR_ACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_INACTIVE_FILE)),
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nid, K(node_page_state(nid, NR_UNEVICTABLE)),
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nid, K(node_page_state(nid, NR_MLOCK)),
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#ifdef CONFIG_HIGHMEM
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nid, K(i.totalhigh),
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nid, K(i.freehigh),
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nid, K(i.totalram - i.totalhigh),
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nid, K(i.freeram - i.freehigh),
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#endif
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nid, K(node_page_state(nid, NR_FILE_DIRTY)),
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nid, K(node_page_state(nid, NR_WRITEBACK)),
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nid, K(node_page_state(nid, NR_FILE_PAGES)),
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nid, K(node_page_state(nid, NR_FILE_MAPPED)),
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nid, K(node_page_state(nid, NR_ANON_PAGES)),
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nid, K(node_page_state(nid, NR_SHMEM)),
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nid, node_page_state(nid, NR_KERNEL_STACK) *
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THREAD_SIZE / 1024,
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nid, K(node_page_state(nid, NR_PAGETABLE)),
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nid, K(node_page_state(nid, NR_UNSTABLE_NFS)),
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nid, K(node_page_state(nid, NR_BOUNCE)),
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nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)),
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nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) +
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node_page_state(nid, NR_SLAB_UNRECLAIMABLE)),
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nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)),
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nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)));
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n += hugetlb_report_node_meminfo(nid, buf + n);
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return n;
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}
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#undef K
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static SYSDEV_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL);
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static ssize_t node_read_numastat(struct sys_device * dev,
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struct sysdev_attribute *attr, char * buf)
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{
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return sprintf(buf,
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"numa_hit %lu\n"
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"numa_miss %lu\n"
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"numa_foreign %lu\n"
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"interleave_hit %lu\n"
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"local_node %lu\n"
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"other_node %lu\n",
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node_page_state(dev->id, NUMA_HIT),
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node_page_state(dev->id, NUMA_MISS),
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node_page_state(dev->id, NUMA_FOREIGN),
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node_page_state(dev->id, NUMA_INTERLEAVE_HIT),
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node_page_state(dev->id, NUMA_LOCAL),
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node_page_state(dev->id, NUMA_OTHER));
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}
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static SYSDEV_ATTR(numastat, S_IRUGO, node_read_numastat, NULL);
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static ssize_t node_read_distance(struct sys_device * dev,
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struct sysdev_attribute *attr, char * buf)
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{
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int nid = dev->id;
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int len = 0;
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int i;
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/* buf currently PAGE_SIZE, need ~4 chars per node */
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BUILD_BUG_ON(MAX_NUMNODES*4 > PAGE_SIZE/2);
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for_each_online_node(i)
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len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i));
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len += sprintf(buf + len, "\n");
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return len;
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}
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static SYSDEV_ATTR(distance, S_IRUGO, node_read_distance, NULL);
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#ifdef CONFIG_HUGETLBFS
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/*
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* hugetlbfs per node attributes registration interface:
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* When/if hugetlb[fs] subsystem initializes [sometime after this module],
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* it will register its per node attributes for all online nodes with
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* memory. It will also call register_hugetlbfs_with_node(), below, to
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* register its attribute registration functions with this node driver.
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* Once these hooks have been initialized, the node driver will call into
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* the hugetlb module to [un]register attributes for hot-plugged nodes.
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*/
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static node_registration_func_t __hugetlb_register_node;
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static node_registration_func_t __hugetlb_unregister_node;
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static inline bool hugetlb_register_node(struct node *node)
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{
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if (__hugetlb_register_node &&
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node_state(node->sysdev.id, N_HIGH_MEMORY)) {
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__hugetlb_register_node(node);
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return true;
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}
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return false;
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}
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static inline void hugetlb_unregister_node(struct node *node)
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{
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if (__hugetlb_unregister_node)
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__hugetlb_unregister_node(node);
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}
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void register_hugetlbfs_with_node(node_registration_func_t doregister,
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node_registration_func_t unregister)
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{
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__hugetlb_register_node = doregister;
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__hugetlb_unregister_node = unregister;
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}
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#else
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static inline void hugetlb_register_node(struct node *node) {}
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static inline void hugetlb_unregister_node(struct node *node) {}
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#endif
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/*
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* register_node - Setup a sysfs device for a node.
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* @num - Node number to use when creating the device.
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*
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* Initialize and register the node device.
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*/
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int register_node(struct node *node, int num, struct node *parent)
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{
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int error;
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node->sysdev.id = num;
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node->sysdev.cls = &node_class;
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error = sysdev_register(&node->sysdev);
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if (!error){
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sysdev_create_file(&node->sysdev, &attr_cpumap);
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sysdev_create_file(&node->sysdev, &attr_cpulist);
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sysdev_create_file(&node->sysdev, &attr_meminfo);
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sysdev_create_file(&node->sysdev, &attr_numastat);
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sysdev_create_file(&node->sysdev, &attr_distance);
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scan_unevictable_register_node(node);
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hugetlb_register_node(node);
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}
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return error;
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}
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/**
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* unregister_node - unregister a node device
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* @node: node going away
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*
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* Unregisters a node device @node. All the devices on the node must be
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* unregistered before calling this function.
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*/
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void unregister_node(struct node *node)
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{
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sysdev_remove_file(&node->sysdev, &attr_cpumap);
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sysdev_remove_file(&node->sysdev, &attr_cpulist);
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sysdev_remove_file(&node->sysdev, &attr_meminfo);
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sysdev_remove_file(&node->sysdev, &attr_numastat);
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sysdev_remove_file(&node->sysdev, &attr_distance);
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scan_unevictable_unregister_node(node);
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hugetlb_unregister_node(node); /* no-op, if memoryless node */
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sysdev_unregister(&node->sysdev);
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}
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struct node node_devices[MAX_NUMNODES];
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/*
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* register cpu under node
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*/
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int register_cpu_under_node(unsigned int cpu, unsigned int nid)
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{
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int ret;
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struct sys_device *obj;
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if (!node_online(nid))
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return 0;
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obj = get_cpu_sysdev(cpu);
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if (!obj)
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return 0;
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ret = sysfs_create_link(&node_devices[nid].sysdev.kobj,
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&obj->kobj,
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kobject_name(&obj->kobj));
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if (ret)
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return ret;
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return sysfs_create_link(&obj->kobj,
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&node_devices[nid].sysdev.kobj,
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kobject_name(&node_devices[nid].sysdev.kobj));
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}
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int unregister_cpu_under_node(unsigned int cpu, unsigned int nid)
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{
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struct sys_device *obj;
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if (!node_online(nid))
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return 0;
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obj = get_cpu_sysdev(cpu);
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if (!obj)
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return 0;
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sysfs_remove_link(&node_devices[nid].sysdev.kobj,
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kobject_name(&obj->kobj));
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sysfs_remove_link(&obj->kobj,
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kobject_name(&node_devices[nid].sysdev.kobj));
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return 0;
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}
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#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
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#define page_initialized(page) (page->lru.next)
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static int get_nid_for_pfn(unsigned long pfn)
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{
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struct page *page;
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if (!pfn_valid_within(pfn))
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return -1;
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page = pfn_to_page(pfn);
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if (!page_initialized(page))
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return -1;
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return pfn_to_nid(pfn);
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}
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/* register memory section under specified node if it spans that node */
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int register_mem_sect_under_node(struct memory_block *mem_blk, int nid)
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{
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int ret;
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unsigned long pfn, sect_start_pfn, sect_end_pfn;
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if (!mem_blk)
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return -EFAULT;
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if (!node_online(nid))
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return 0;
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sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
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sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
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for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
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int page_nid;
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page_nid = get_nid_for_pfn(pfn);
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if (page_nid < 0)
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continue;
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if (page_nid != nid)
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continue;
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ret = sysfs_create_link_nowarn(&node_devices[nid].sysdev.kobj,
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&mem_blk->sysdev.kobj,
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kobject_name(&mem_blk->sysdev.kobj));
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if (ret)
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return ret;
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return sysfs_create_link_nowarn(&mem_blk->sysdev.kobj,
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&node_devices[nid].sysdev.kobj,
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kobject_name(&node_devices[nid].sysdev.kobj));
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}
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/* mem section does not span the specified node */
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return 0;
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}
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/* unregister memory section under all nodes that it spans */
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int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
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{
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NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL);
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unsigned long pfn, sect_start_pfn, sect_end_pfn;
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if (!mem_blk) {
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NODEMASK_FREE(unlinked_nodes);
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return -EFAULT;
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}
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if (!unlinked_nodes)
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return -ENOMEM;
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nodes_clear(*unlinked_nodes);
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sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
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sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
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for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
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int nid;
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nid = get_nid_for_pfn(pfn);
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if (nid < 0)
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continue;
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if (!node_online(nid))
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continue;
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if (node_test_and_set(nid, *unlinked_nodes))
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continue;
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sysfs_remove_link(&node_devices[nid].sysdev.kobj,
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kobject_name(&mem_blk->sysdev.kobj));
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sysfs_remove_link(&mem_blk->sysdev.kobj,
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kobject_name(&node_devices[nid].sysdev.kobj));
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}
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NODEMASK_FREE(unlinked_nodes);
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return 0;
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}
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static int link_mem_sections(int nid)
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{
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unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
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unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
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unsigned long pfn;
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int err = 0;
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for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
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unsigned long section_nr = pfn_to_section_nr(pfn);
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struct mem_section *mem_sect;
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struct memory_block *mem_blk;
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int ret;
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if (!present_section_nr(section_nr))
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continue;
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mem_sect = __nr_to_section(section_nr);
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mem_blk = find_memory_block(mem_sect);
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ret = register_mem_sect_under_node(mem_blk, nid);
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if (!err)
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err = ret;
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/* discard ref obtained in find_memory_block() */
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kobject_put(&mem_blk->sysdev.kobj);
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}
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return err;
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}
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#ifdef CONFIG_HUGETLBFS
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/*
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* Handle per node hstate attribute [un]registration on transistions
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* to/from memoryless state.
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*/
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static void node_hugetlb_work(struct work_struct *work)
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{
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struct node *node = container_of(work, struct node, node_work);
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/*
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* We only get here when a node transitions to/from memoryless state.
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* We can detect which transition occurred by examining whether the
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* node has memory now. hugetlb_register_node() already check this
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* so we try to register the attributes. If that fails, then the
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* node has transitioned to memoryless, try to unregister the
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* attributes.
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*/
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if (!hugetlb_register_node(node))
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hugetlb_unregister_node(node);
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}
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static void init_node_hugetlb_work(int nid)
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{
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INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work);
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}
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static int node_memory_callback(struct notifier_block *self,
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unsigned long action, void *arg)
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{
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struct memory_notify *mnb = arg;
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int nid = mnb->status_change_nid;
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switch (action) {
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case MEM_ONLINE:
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case MEM_OFFLINE:
|
|
/*
|
|
* offload per node hstate [un]registration to a work thread
|
|
* when transitioning to/from memoryless state.
|
|
*/
|
|
if (nid != NUMA_NO_NODE)
|
|
schedule_work(&node_devices[nid].node_work);
|
|
break;
|
|
|
|
case MEM_GOING_ONLINE:
|
|
case MEM_GOING_OFFLINE:
|
|
case MEM_CANCEL_ONLINE:
|
|
case MEM_CANCEL_OFFLINE:
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
#endif /* CONFIG_HUGETLBFS */
|
|
#else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */
|
|
|
|
static int link_mem_sections(int nid) { return 0; }
|
|
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
|
|
|
|
#if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \
|
|
!defined(CONFIG_HUGETLBFS)
|
|
static inline int node_memory_callback(struct notifier_block *self,
|
|
unsigned long action, void *arg)
|
|
{
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static void init_node_hugetlb_work(int nid) { }
|
|
|
|
#endif
|
|
|
|
int register_one_node(int nid)
|
|
{
|
|
int error = 0;
|
|
int cpu;
|
|
|
|
if (node_online(nid)) {
|
|
int p_node = parent_node(nid);
|
|
struct node *parent = NULL;
|
|
|
|
if (p_node != nid)
|
|
parent = &node_devices[p_node];
|
|
|
|
error = register_node(&node_devices[nid], nid, parent);
|
|
|
|
/* link cpu under this node */
|
|
for_each_present_cpu(cpu) {
|
|
if (cpu_to_node(cpu) == nid)
|
|
register_cpu_under_node(cpu, nid);
|
|
}
|
|
|
|
/* link memory sections under this node */
|
|
error = link_mem_sections(nid);
|
|
|
|
/* initialize work queue for memory hot plug */
|
|
init_node_hugetlb_work(nid);
|
|
}
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
void unregister_one_node(int nid)
|
|
{
|
|
unregister_node(&node_devices[nid]);
|
|
}
|
|
|
|
/*
|
|
* node states attributes
|
|
*/
|
|
|
|
static ssize_t print_nodes_state(enum node_states state, char *buf)
|
|
{
|
|
int n;
|
|
|
|
n = nodelist_scnprintf(buf, PAGE_SIZE, node_states[state]);
|
|
if (n > 0 && PAGE_SIZE > n + 1) {
|
|
*(buf + n++) = '\n';
|
|
*(buf + n++) = '\0';
|
|
}
|
|
return n;
|
|
}
|
|
|
|
static ssize_t print_nodes_possible(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr, char *buf)
|
|
{
|
|
return print_nodes_state(N_POSSIBLE, buf);
|
|
}
|
|
|
|
static ssize_t print_nodes_online(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return print_nodes_state(N_ONLINE, buf);
|
|
}
|
|
|
|
static ssize_t print_nodes_has_normal_memory(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return print_nodes_state(N_NORMAL_MEMORY, buf);
|
|
}
|
|
|
|
static ssize_t print_nodes_has_cpu(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return print_nodes_state(N_CPU, buf);
|
|
}
|
|
|
|
static SYSDEV_CLASS_ATTR(possible, 0444, print_nodes_possible, NULL);
|
|
static SYSDEV_CLASS_ATTR(online, 0444, print_nodes_online, NULL);
|
|
static SYSDEV_CLASS_ATTR(has_normal_memory, 0444, print_nodes_has_normal_memory,
|
|
NULL);
|
|
static SYSDEV_CLASS_ATTR(has_cpu, 0444, print_nodes_has_cpu, NULL);
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
static ssize_t print_nodes_has_high_memory(struct sysdev_class *class,
|
|
struct sysdev_class_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return print_nodes_state(N_HIGH_MEMORY, buf);
|
|
}
|
|
|
|
static SYSDEV_CLASS_ATTR(has_high_memory, 0444, print_nodes_has_high_memory,
|
|
NULL);
|
|
#endif
|
|
|
|
struct sysdev_class_attribute *node_state_attr[] = {
|
|
&attr_possible,
|
|
&attr_online,
|
|
&attr_has_normal_memory,
|
|
#ifdef CONFIG_HIGHMEM
|
|
&attr_has_high_memory,
|
|
#endif
|
|
&attr_has_cpu,
|
|
};
|
|
|
|
static int node_states_init(void)
|
|
{
|
|
int i;
|
|
int err = 0;
|
|
|
|
for (i = 0; i < NR_NODE_STATES; i++) {
|
|
int ret;
|
|
ret = sysdev_class_create_file(&node_class, node_state_attr[i]);
|
|
if (!err)
|
|
err = ret;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#define NODE_CALLBACK_PRI 2 /* lower than SLAB */
|
|
static int __init register_node_type(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = sysdev_class_register(&node_class);
|
|
if (!ret) {
|
|
ret = node_states_init();
|
|
hotplug_memory_notifier(node_memory_callback,
|
|
NODE_CALLBACK_PRI);
|
|
}
|
|
|
|
/*
|
|
* Note: we're not going to unregister the node class if we fail
|
|
* to register the node state class attribute files.
|
|
*/
|
|
return ret;
|
|
}
|
|
postcore_initcall(register_node_type);
|