aboutsummaryrefslogtreecommitdiff
path: root/hw/mem/pc-dimm.c
diff options
context:
space:
mode:
authorIgor Mammedov <imammedo@redhat.com>2014-06-02 15:25:13 +0200
committerMichael S. Tsirkin <mst@redhat.com>2014-06-19 16:41:49 +0300
commit0b3125711606374f04e279aebefcb7275480f040 (patch)
tree4d917c4e2c127a6d044aa3a0113ed7f67e9a0c16 /hw/mem/pc-dimm.c
parent95bee274fd1d22dc6d35e52987f8b5d29fe754dd (diff)
pc-dimm: add busy address check and address auto-allocation
- if 'addr' property is not specified on -device/device_add command, treat the default value as request for assigning PCDIMMDevice to the first free memory region. - if 'addr' is provided with -device/device_add command, attempt to use it or fail command if it's already occupied or falls inside of an existing PCDIMMDevice memory region. Note: GCompareFunc(a, b) used by g_slist_insert_sorted() returns 'gint', however it might be too small to fit difference between 2 addresses. So use 128bit to calculate the difference and normalize result to -1/0/1 return values. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Tested-by: Andrey Korolyov <andrey@xdel.ru> MST: commit log tweaks
Diffstat (limited to 'hw/mem/pc-dimm.c')
-rw-r--r--hw/mem/pc-dimm.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 3cced63de3..40b51c883e 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -21,6 +21,88 @@
#include "hw/mem/pc-dimm.h"
#include "qemu/config-file.h"
#include "qapi/visitor.h"
+#include "qemu/range.h"
+
+static gint pc_dimm_addr_sort(gconstpointer a, gconstpointer b)
+{
+ PCDIMMDevice *x = PC_DIMM(a);
+ PCDIMMDevice *y = PC_DIMM(b);
+ Int128 diff = int128_sub(int128_make64(x->addr), int128_make64(y->addr));
+
+ if (int128_lt(diff, int128_zero())) {
+ return -1;
+ } else if (int128_gt(diff, int128_zero())) {
+ return 1;
+ }
+ return 0;
+}
+
+static int pc_dimm_built_list(Object *obj, void *opaque)
+{
+ GSList **list = opaque;
+
+ if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
+ DeviceState *dev = DEVICE(obj);
+ if (dev->realized) { /* only realized DIMMs matter */
+ *list = g_slist_insert_sorted(*list, dev, pc_dimm_addr_sort);
+ }
+ }
+
+ object_child_foreach(obj, pc_dimm_built_list, opaque);
+ return 0;
+}
+
+uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
+ uint64_t address_space_size,
+ uint64_t *hint, uint64_t size,
+ Error **errp)
+{
+ GSList *list = NULL, *item;
+ uint64_t new_addr, ret = 0;
+ uint64_t address_space_end = address_space_start + address_space_size;
+
+ assert(address_space_end > address_space_size);
+ object_child_foreach(qdev_get_machine(), pc_dimm_built_list, &list);
+
+ if (hint) {
+ new_addr = *hint;
+ } else {
+ new_addr = address_space_start;
+ }
+
+ /* find address range that will fit new DIMM */
+ for (item = list; item; item = g_slist_next(item)) {
+ PCDIMMDevice *dimm = item->data;
+ uint64_t dimm_size = object_property_get_int(OBJECT(dimm),
+ PC_DIMM_SIZE_PROP,
+ errp);
+ if (errp && *errp) {
+ goto out;
+ }
+
+ if (ranges_overlap(dimm->addr, dimm_size, new_addr, size)) {
+ if (hint) {
+ DeviceState *d = DEVICE(dimm);
+ error_setg(errp, "address range conflicts with '%s'", d->id);
+ goto out;
+ }
+ new_addr = dimm->addr + dimm_size;
+ }
+ }
+ ret = new_addr;
+
+ if (new_addr < address_space_start) {
+ error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
+ "] at 0x%" PRIx64, new_addr, size, address_space_start);
+ } else if ((new_addr + size) > address_space_end) {
+ error_setg(errp, "can't add memory [0x%" PRIx64 ":0x%" PRIx64
+ "] beyond 0x%" PRIx64, new_addr, size, address_space_end);
+ }
+
+out:
+ g_slist_free(list);
+ return ret;
+}
static Property pc_dimm_properties[] = {
DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0),