Hello Chandru,
> static int __init early_init_dt_scan_drconf_memory(unsigned long node)
> {
> - cell_t *dm, *ls;
> + cell_t *dm, *ls, *endp, *usm;
> unsigned long l, n, flags;
> u64 base, size, lmb_size;
> + char buf[32], t[8];
>
> ls = (cell_t *)of_get_flat_dt_prop(node, "ibm,lmb-size", &l);
> if (ls == NULL || l < dt_root_size_cells * sizeof(cell_t))
> @@ -917,7 +918,33 @@ static int __init early_init_dt_scan_drc
> if ((base + size) > 0x80000000ul)
> size = 0x80000000ul - base;
> }
> - lmb_add(base, size);
> + strcpy(buf, "linux,usable-memory");
> + sprintf(t, "%d", (int)n);
> + strcat(buf, t);
> + usm = (cell_t *)of_get_flat_dt_prop(node,
> + (const char *)buf, &l);
> + if (usm != NULL) {
> + endp = usm + (l / sizeof(cell_t));
> + while ((endp - usm) >= (dt_root_addr_cells +
> + dt_root_size_cells)) {
> + base = dt_mem_next_cell(dt_root_addr_cells,
> + &usm);
> + size = dt_mem_next_cell(dt_root_size_cells,
> + &usm);
> + if (size == 0)
> + continue;
> + if (iommu_is_off) {
> + if ((base + size) > 0x80000000ul)
> + size = 0x80000000ul - base;
> + }
> + lmb_add(base, size);
> + }
> +
> + /* Continue with next lmb entry */
> + continue;
> + } else {
> + lmb_add(base, size);
> + }
> }
I am still digging through the kexec tools but I don't think you want
the processing of the linux,usable-memory property inside of the
for (; n!= 0; --n) loop. This should be moved up so that it looks for
the linux,usable-memory property and parses it, then if it is not found
look for the ibm,dynamic-reconfiguration-memory property and parse it.
There is no need to look for the linux-usable-memory property every time
a piece of the ibm,dynamic-reconfiguration-memory property is parsed.
-Nathan
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