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-rw-r--r--arch/powerpc/kernel/prom.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index c18dbe77fdc2..1fc732a552db 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -804,6 +804,56 @@ static unsigned long __init dt_mem_next_cell(int s, cell_t **cellp)
804 return of_read_ulong(p, s); 804 return of_read_ulong(p, s);
805} 805}
806 806
807#ifdef CONFIG_PPC_PSERIES
808/*
809 * Interpret the ibm,dynamic-memory property in the
810 * /ibm,dynamic-reconfiguration-memory node.
811 * This contains a list of memory blocks along with NUMA affinity
812 * information.
813 */
814static int __init early_init_dt_scan_drconf_memory(unsigned long node)
815{
816 cell_t *dm, *ls;
817 unsigned long l, n;
818 unsigned long base, size, lmb_size, flags;
819
820 ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
821 if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
822 return 0;
823 lmb_size = dt_mem_next_cell(dt_root_size_cells, &ls);
824
825 dm = (cell_t *)of_get_flat_dt_prop(node, "ibm,dynamic-memory", &l);
826 if (dm == NULL || l < sizeof(cell_t))
827 return 0;
828
829 n = *dm++; /* number of entries */
830 if (l < (n * (dt_root_addr_cells + 4) + 1) * sizeof(cell_t))
831 return 0;
832
833 for (; n != 0; --n) {
834 base = dt_mem_next_cell(dt_root_addr_cells, &dm);
835 flags = dm[3];
836 /* skip DRC index, pad, assoc. list index, flags */
837 dm += 4;
838 /* skip this block if the reserved bit is set in flags (0x80)
839 or if the block is not assigned to this partition (0x8) */
840 if ((flags & 0x80) || !(flags & 0x8))
841 continue;
842 size = lmb_size;
843 if (iommu_is_off) {
844 if (base >= 0x80000000ul)
845 continue;
846 if ((base + size) > 0x80000000ul)
847 size = 0x80000000ul - base;
848 }
849 lmb_add(base, size);
850 }
851 lmb_dump_all();
852 return 0;
853}
854#else
855#define early_init_dt_scan_drconf_memory(node) 0
856#endif /* CONFIG_PPC_PSERIES */
807 857
808static int __init early_init_dt_scan_memory(unsigned long node, 858static int __init early_init_dt_scan_memory(unsigned long node,
809 const char *uname, int depth, void *data) 859 const char *uname, int depth, void *data)
@@ -812,6 +862,11 @@ static int __init early_init_dt_scan_memory(unsigned long node,
812 cell_t *reg, *endp; 862 cell_t *reg, *endp;
813 unsigned long l; 863 unsigned long l;
814 864
865 /* Look for the ibm,dynamic-reconfiguration-memory node */
866 if (depth == 1 &&
867 strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
868 return early_init_dt_scan_drconf_memory(node);
869
815 /* We are scanning "memory" nodes only */ 870 /* We are scanning "memory" nodes only */
816 if (type == NULL) { 871 if (type == NULL) {
817 /* 872 /*