#include <linux/nodemask.h>
#include <linux/cpu.h>
#include <linux/notifier.h>
+#include <linux/lmb.h>
+#include <linux/of.h>
+#include <linux/pfn.h>
#include <asm/sparsemem.h>
-#include <asm/lmb.h>
+#include <asm/prom.h>
#include <asm/system.h>
#include <asm/smp.h>
EXPORT_SYMBOL(numa_cpumask_lookup_table);
EXPORT_SYMBOL(node_data);
-static bootmem_data_t __initdata plat_node_bdata[MAX_NUMNODES];
static int min_common_depth;
static int n_mem_addr_cells, n_mem_size_cells;
return 0;
}
+/*
+ * get_active_region_work_fn - A helper function for get_node_active_region
+ * Returns datax set to the start_pfn and end_pfn if they contain
+ * the initial value of datax->start_pfn between them
+ * @start_pfn: start page(inclusive) of region to check
+ * @end_pfn: end page(exclusive) of region to check
+ * @datax: comes in with ->start_pfn set to value to search for and
+ * goes out with active range if it contains it
+ * Returns 1 if search value is in range else 0
+ */
+static int __init get_active_region_work_fn(unsigned long start_pfn,
+ unsigned long end_pfn, void *datax)
+{
+ struct node_active_region *data;
+ data = (struct node_active_region *)datax;
+
+ if (start_pfn <= data->start_pfn && end_pfn > data->start_pfn) {
+ data->start_pfn = start_pfn;
+ data->end_pfn = end_pfn;
+ return 1;
+ }
+ return 0;
+
+}
+
+/*
+ * get_node_active_region - Return active region containing start_pfn
+ * Active range returned is empty if none found.
+ * @start_pfn: The page to return the region for.
+ * @node_ar: Returned set to the active region containing start_pfn
+ */
+static void __init get_node_active_region(unsigned long start_pfn,
+ struct node_active_region *node_ar)
+{
+ int nid = early_pfn_to_nid(start_pfn);
+
+ node_ar->nid = nid;
+ node_ar->start_pfn = start_pfn;
+ node_ar->end_pfn = start_pfn;
+ work_with_active_regions(nid, get_active_region_work_fn, node_ar);
+}
+
static void __cpuinit map_cpu_to_node(int cpu, int node)
{
numa_cpu_lookup_table[cpu] = node;
}
#endif /* CONFIG_HOTPLUG_CPU */
-static struct device_node * __cpuinit find_cpu_node(unsigned int cpu)
-{
- unsigned int hw_cpuid = get_hard_smp_processor_id(cpu);
- struct device_node *cpu_node = NULL;
- const unsigned int *interrupt_server, *reg;
- int len;
-
- while ((cpu_node = of_find_node_by_type(cpu_node, "cpu")) != NULL) {
- /* Try interrupt server first */
- interrupt_server = of_get_property(cpu_node,
- "ibm,ppc-interrupt-server#s", &len);
-
- len = len / sizeof(u32);
-
- if (interrupt_server && (len > 0)) {
- while (len--) {
- if (interrupt_server[len] == hw_cpuid)
- return cpu_node;
- }
- } else {
- reg = of_get_property(cpu_node, "reg", &len);
- if (reg && (len > 0) && (reg[0] == hw_cpuid))
- return cpu_node;
- }
- }
-
- return NULL;
-}
-
/* must hold reference to node during call */
static const int *of_get_associativity(struct device_node *dev)
{
return of_get_property(dev, "ibm,associativity", NULL);
}
+/*
+ * Returns the property linux,drconf-usable-memory if
+ * it exists (the property exists only in kexec/kdump kernels,
+ * added by kexec-tools)
+ */
+static const u32 *of_get_usable_memory(struct device_node *memory)
+{
+ const u32 *prop;
+ u32 len;
+ prop = of_get_property(memory, "linux,drconf-usable-memory", &len);
+ if (!prop || len < sizeof(unsigned int))
+ return 0;
+ return prop;
+}
+
/* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
* info is found.
*/
ref_points = of_get_property(rtas_root,
"ibm,associativity-reference-points", &len);
- if ((len >= 1) && ref_points) {
+ if ((len >= 2 * sizeof(unsigned int)) && ref_points) {
depth = ref_points[1];
} else {
dbg("NUMA: ibm,associativity-reference-points not found.\n");
return result;
}
+struct of_drconf_cell {
+ u64 base_addr;
+ u32 drc_index;
+ u32 reserved;
+ u32 aa_index;
+ u32 flags;
+};
+
+#define DRCONF_MEM_ASSIGNED 0x00000008
+#define DRCONF_MEM_AI_INVALID 0x00000040
+#define DRCONF_MEM_RESERVED 0x00000080
+
+/*
+ * Read the next lmb list entry from the ibm,dynamic-memory property
+ * and return the information in the provided of_drconf_cell structure.
+ */
+static void read_drconf_cell(struct of_drconf_cell *drmem, const u32 **cellp)
+{
+ const u32 *cp;
+
+ drmem->base_addr = read_n_cells(n_mem_addr_cells, cellp);
+
+ cp = *cellp;
+ drmem->drc_index = cp[0];
+ drmem->reserved = cp[1];
+ drmem->aa_index = cp[2];
+ drmem->flags = cp[3];
+
+ *cellp = cp + 4;
+}
+
+/*
+ * Retreive and validate the ibm,dynamic-memory property of the device tree.
+ *
+ * The layout of the ibm,dynamic-memory property is a number N of lmb
+ * list entries followed by N lmb list entries. Each lmb list entry
+ * contains information as layed out in the of_drconf_cell struct above.
+ */
+static int of_get_drconf_memory(struct device_node *memory, const u32 **dm)
+{
+ const u32 *prop;
+ u32 len, entries;
+
+ prop = of_get_property(memory, "ibm,dynamic-memory", &len);
+ if (!prop || len < sizeof(unsigned int))
+ return 0;
+
+ entries = *prop++;
+
+ /* Now that we know the number of entries, revalidate the size
+ * of the property read in to ensure we have everything
+ */
+ if (len < (entries * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int))
+ return 0;
+
+ *dm = prop;
+ return entries;
+}
+
+/*
+ * Retreive and validate the ibm,lmb-size property for drconf memory
+ * from the device tree.
+ */
+static u64 of_get_lmb_size(struct device_node *memory)
+{
+ const u32 *prop;
+ u32 len;
+
+ prop = of_get_property(memory, "ibm,lmb-size", &len);
+ if (!prop || len < sizeof(unsigned int))
+ return 0;
+
+ return read_n_cells(n_mem_size_cells, &prop);
+}
+
+struct assoc_arrays {
+ u32 n_arrays;
+ u32 array_sz;
+ const u32 *arrays;
+};
+
+/*
+ * Retreive and validate the list of associativity arrays for drconf
+ * memory from the ibm,associativity-lookup-arrays property of the
+ * device tree..
+ *
+ * The layout of the ibm,associativity-lookup-arrays property is a number N
+ * 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))
+ return -1;
+
+ aa->n_arrays = *prop++;
+ aa->array_sz = *prop++;
+
+ /* Now that we know the number of arrrays 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 = find_cpu_node(lcpu);
+ struct device_node *cpu = of_get_cpu_node(lcpu, NULL);
if (!cpu) {
WARN_ON(1);
/*
* We use lmb_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.
+ * having memory holes below the limit. Also, in the case of
+ * iommu_is_off, memory_limit is not set but is implicitly enforced.
*/
- if (! memory_limit)
- return size;
-
if (start + size <= lmb_end_of_DRAM())
return size;
}
/*
+ * 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 unsigned int *lm, *dm, *aa;
- unsigned int ls, ld, la;
- unsigned int n, aam, aalen;
- unsigned long lmb_size, size, start;
- int nid, default_nid = 0;
- unsigned int ai, flags;
-
- lm = of_get_property(memory, "ibm,lmb-size", &ls);
- dm = of_get_property(memory, "ibm,dynamic-memory", &ld);
- aa = of_get_property(memory, "ibm,associativity-lookup-arrays", &la);
- if (!lm || !dm || !aa ||
- ls < sizeof(unsigned int) || ld < sizeof(unsigned int) ||
- la < 2 * sizeof(unsigned int))
+ const u32 *dm, *usm;
+ unsigned int n, rc, ranges, is_kexec_kdump = 0;
+ unsigned long lmb_size, base, size, sz;
+ int nid;
+ struct assoc_arrays aa;
+
+ n = of_get_drconf_memory(memory, &dm);
+ if (!n)
+ return;
+
+ lmb_size = of_get_lmb_size(memory);
+ if (!lmb_size)
return;
- lmb_size = read_n_cells(n_mem_size_cells, &lm);
- n = *dm++; /* number of LMBs */
- aam = *aa++; /* number of associativity lists */
- aalen = *aa++; /* length of each associativity list */
- if (ld < (n * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int) ||
- la < (aam * aalen + 2) * sizeof(unsigned int))
+ 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) {
- start = read_n_cells(n_mem_addr_cells, &dm);
- ai = dm[2];
- flags = dm[3];
- dm += 4;
- /* 0x80 == reserved, 0x8 = assigned to us */
- if ((flags & 0x80) || !(flags & 0x8))
- continue;
- nid = default_nid;
- /* flags & 0x40 means associativity index is invalid */
- if (min_common_depth > 0 && min_common_depth <= aalen &&
- (flags & 0x40) == 0 && ai < aam) {
- /* this is like of_node_to_nid_single */
- nid = aa[ai * aalen + min_common_depth - 1];
- if (nid == 0xffff || nid >= MAX_NUMNODES)
- nid = default_nid;
- }
+ struct of_drconf_cell drmem;
- fake_numa_create_new_node(((start + lmb_size) >> PAGE_SHIFT),
- &nid);
- node_set_online(nid);
+ read_drconf_cell(&drmem, &dm);
- size = numa_enforce_memory_limit(start, lmb_size);
- if (!size)
+ /* 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;
- add_active_range(nid, start >> PAGE_SHIFT,
- (start >> PAGE_SHIFT) + (size >> PAGE_SHIFT));
+ 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)
+ add_active_range(nid, base >> PAGE_SHIFT,
+ (base >> PAGE_SHIFT)
+ + (sz >> PAGE_SHIFT));
+ } while (--ranges);
}
}
for_each_present_cpu(i) {
int nid;
- cpu = find_cpu_node(i);
+ cpu = of_get_cpu_node(i, NULL);
BUG_ON(!cpu);
nid = of_node_to_nid_single(cpu);
of_node_put(cpu);
* required. nid is the preferred node and end is the physical address of
* the highest address in the node.
*
- * Returns the physical address of the memory.
+ * Returns the virtual address of the memory.
*/
-static void __init *careful_allocation(int nid, unsigned long size,
+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 = __lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
+ unsigned long ret_paddr;
+
+ ret_paddr = __lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
/* retry over all memory */
- if (!ret)
- ret = __lmb_alloc_base(size, align, lmb_end_of_DRAM());
+ if (!ret_paddr)
+ ret_paddr = __lmb_alloc_base(size, align, lmb_end_of_DRAM());
- if (!ret)
- panic("numa.c: cannot allocate %lu bytes on node %d",
+ if (!ret_paddr)
+ panic("numa.c: cannot allocate %lu bytes for node %d",
size, nid);
+ ret = __va(ret_paddr);
+
/*
- * If the memory came from a previously allocated node, we must
- * retry with the bootmem allocator.
+ * We initialize the nodes in numeric order: 0, 1, 2...
+ * and hand over control from the LMB 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 LMB allocator.
+ *
+ * So, check the nid from which this allocation came
+ * and double check to see if we need to use bootmem
+ * instead of the LMB. We don't free the LMB memory
+ * since it would be useless.
*/
- new_nid = early_pfn_to_nid(ret >> PAGE_SHIFT);
+ new_nid = early_pfn_to_nid(ret_paddr >> PAGE_SHIFT);
if (new_nid < nid) {
- ret = (unsigned long)__alloc_bootmem_node(NODE_DATA(new_nid),
+ ret = __alloc_bootmem_node(NODE_DATA(new_nid),
size, align, 0);
- if (!ret)
- panic("numa.c: cannot allocate %lu bytes on node %d",
- size, new_nid);
-
- ret = __pa(ret);
-
- dbg("alloc_bootmem %lx %lx\n", ret, size);
+ dbg("alloc_bootmem %p %lx\n", ret, size);
}
- return (void *)ret;
+ memset(ret, 0, size);
+ return ret;
}
static struct notifier_block __cpuinitdata ppc64_numa_nb = {
.priority = 1 /* Must run before sched domains notifier. */
};
+static void mark_reserved_regions_for_nid(int nid)
+{
+ struct pglist_data *node = NODE_DATA(nid);
+ int i;
+
+ for (i = 0; i < lmb.reserved.cnt; i++) {
+ unsigned long physbase = lmb.reserved.region[i].base;
+ unsigned long size = lmb.reserved.region[i].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 lmb.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;
- unsigned int i;
min_low_pfn = 0;
max_low_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
for_each_online_node(nid) {
unsigned long start_pfn, end_pfn;
- unsigned long bootmem_paddr;
+ 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 */
- NODE_DATA(nid) = careful_allocation(nid,
+ /*
+ * 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);
- NODE_DATA(nid) = __va(NODE_DATA(nid));
- memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
dbg("node %d\n", nid);
dbg("NODE_DATA() = %p\n", NODE_DATA(nid));
- NODE_DATA(nid)->bdata = &plat_node_bdata[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;
dbg("end_paddr = %lx\n", end_pfn << PAGE_SHIFT);
bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
- bootmem_paddr = (unsigned long)careful_allocation(nid,
+ bootmem_vaddr = careful_zallocation(nid,
bootmap_pages << PAGE_SHIFT,
PAGE_SIZE, end_pfn);
- memset(__va(bootmem_paddr), 0, bootmap_pages << PAGE_SHIFT);
- dbg("bootmap_paddr = %lx\n", bootmem_paddr);
+ dbg("bootmap_vaddr = %p\n", bootmem_vaddr);
- init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
+ init_bootmem_node(NODE_DATA(nid),
+ __pa(bootmem_vaddr) >> PAGE_SHIFT,
start_pfn, end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
-
- /* Mark reserved regions on this node */
- for (i = 0; i < lmb.reserved.cnt; i++) {
- unsigned long physbase = lmb.reserved.region[i].base;
- unsigned long size = lmb.reserved.region[i].size;
- unsigned long start_paddr = start_pfn << PAGE_SHIFT;
- unsigned long end_paddr = end_pfn << PAGE_SHIFT;
-
- if (early_pfn_to_nid(physbase >> PAGE_SHIFT) != nid &&
- early_pfn_to_nid((physbase+size-1) >> PAGE_SHIFT) != nid)
- continue;
-
- if (physbase < end_paddr &&
- (physbase+size) > start_paddr) {
- /* overlaps */
- if (physbase < start_paddr) {
- size -= start_paddr - physbase;
- physbase = start_paddr;
- }
-
- if (size > end_paddr - physbase)
- size = end_paddr - physbase;
-
- dbg("reserve_bootmem %lx %lx\n", physbase,
- size);
- reserve_bootmem_node(NODE_DATA(nid), physbase,
- size);
- }
- }
-
+ /*
+ * 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;
}
void __init paging_init(void)
#ifdef CONFIG_MEMORY_HOTPLUG
/*
- * Find the node associated with a hot added memory section. Section
- * corresponds to a SPARSEMEM section, not an LMB. It is assumed that
- * sections are fully contained within a single LMB.
+ * 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.
*/
-int hot_add_scn_to_nid(unsigned long scn_addr)
+static int hot_add_drconf_scn_to_nid(struct device_node *memory,
+ unsigned long scn_addr)
{
- struct device_node *memory = NULL;
- nodemask_t nodes;
- int default_nid = any_online_node(NODE_MASK_ALL);
- int nid;
+ const u32 *dm;
+ unsigned int drconf_cell_cnt, rc;
+ unsigned long lmb_size;
+ struct assoc_arrays aa;
+ int nid = -1;
- if (!numa_enabled || (min_common_depth < 0))
- return default_nid;
+ 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 lmb.
+ */
+int hot_add_node_scn_to_nid(unsigned long scn_addr)
+{
+ struct device_node *memory = NULL;
+ int nid = -1;
while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
unsigned long start, size;
/* ranges in cell */
ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
-ha_new_range:
- start = read_n_cells(n_mem_addr_cells, &memcell_buf);
- size = read_n_cells(n_mem_size_cells, &memcell_buf);
- nid = of_node_to_nid_single(memory);
- /* Domains not present at boot default to 0 */
- if (nid < 0 || !node_online(nid))
- nid = default_nid;
+ 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))) {
- of_node_put(memory);
- goto got_nid;
+ if ((scn_addr < start) || (scn_addr >= (start + size)))
+ continue;
+
+ nid = of_node_to_nid_single(memory);
+ break;
}
- if (--ranges) /* process all ranges in cell */
- goto ha_new_range;
+ of_node_put(memory);
+ if (nid >= 0)
+ break;
}
- BUG(); /* section address should be found above */
- return 0;
- /* Temporary code to ensure that returned node is not empty */
-got_nid:
- nodes_setall(nodes);
- while (NODE_DATA(nid)->node_spanned_pages == 0) {
- node_clear(nid, nodes);
- nid = any_online_node(nodes);
+ return nid;
+}
+
+/*
+ * Find the node associated with a hot added memory section. Section
+ * corresponds to a SPARSEMEM section, not an LMB. It is assumed that
+ * sections are fully contained within a single LMB.
+ */
+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 any_online_node(NODE_MASK_ALL);
+
+ 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 = any_online_node(NODE_MASK_ALL);
+
+ 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;
}
+
#endif /* CONFIG_MEMORY_HOTPLUG */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff