From 0cd03d89b98154fcc03d9a8eeea70b9c50cb9457 Mon Sep 17 00:00:00 2001 From: Igor Mammedov Date: Mon, 2 Jun 2014 15:25:14 +0200 Subject: pc-dimm: add busy slot check and slot auto-allocation - if slot property is not specified on -device/device_add command, treat default value as request for assigning PCDIMMDevice to the first free slot. - if slot is provided with -device/device_add command, attempt to use it or fail command if it's already occupied. Signed-off-by: Igor Mammedov Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/mem/pc-dimm.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'hw/mem') diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c index 40b51c8..8c26568 100644 --- a/hw/mem/pc-dimm.c +++ b/hw/mem/pc-dimm.c @@ -23,6 +23,52 @@ #include "qapi/visitor.h" #include "qemu/range.h" +static int pc_dimm_slot2bitmap(Object *obj, void *opaque) +{ + unsigned long *bitmap = opaque; + + if (object_dynamic_cast(obj, TYPE_PC_DIMM)) { + DeviceState *dev = DEVICE(obj); + if (dev->realized) { /* count only realized DIMMs */ + PCDIMMDevice *d = PC_DIMM(obj); + set_bit(d->slot, bitmap); + } + } + + object_child_foreach(obj, pc_dimm_slot2bitmap, opaque); + return 0; +} + +int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp) +{ + unsigned long *bitmap = bitmap_new(max_slots); + int slot = 0; + + object_child_foreach(qdev_get_machine(), pc_dimm_slot2bitmap, bitmap); + + /* check if requested slot is not occupied */ + if (hint) { + if (*hint >= max_slots) { + error_setg(errp, "invalid slot# %d, should be less than %d", + *hint, max_slots); + } else if (!test_bit(*hint, bitmap)) { + slot = *hint; + } else { + error_setg(errp, "slot %d is busy", *hint); + } + goto out; + } + + /* search for free slot */ + slot = find_first_zero_bit(bitmap, max_slots); + if (slot == max_slots) { + error_setg(errp, "no free slots available"); + } +out: + g_free(bitmap); + return slot; +} + static gint pc_dimm_addr_sort(gconstpointer a, gconstpointer b) { PCDIMMDevice *x = PC_DIMM(a); -- cgit v1.1