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s390x/pci: use hashtable to look up zpci via fh 

After PCI multibus is supported, more than 32 PCI devices could be
plugged. The current implementation of s390_pci_find_dev_by_fh()
appears low performance if there's a huge number of PCI devices
plugged. Therefore we introduce a hashtable using idx as key to store
zpci device's pointer on account of translating fh to idx very easily.

Signed-off-by: Yi Min Zhao <zyimin@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Yi Min Zhao 2016-11-09 21:30:50 +08:00 committed by Cornelia Huck
parent 3fc92a24f3
commit df8dd91b99
2 changed files with 9 additions and 14 deletions
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20
hw/s390x/s390-pci-bus.c
View File

@ -227,26 +227,17 @@ static S390PCIBusDevice *s390_pci_find_dev_by_target(S390pciState *s,
S390PCIBusDevice *s390_pci_find_dev_by_idx(S390pciState *s, uint32_t idx)
{
S390PCIBusDevice *pbdev;
QTAILQ_FOREACH(pbdev, &s->zpci_devs, link) {
if (pbdev->idx == idx) {
return pbdev;
}
}
return NULL;
return g_hash_table_lookup(s->zpci_table, &idx);
}
S390PCIBusDevice *s390_pci_find_dev_by_fh(S390pciState *s, uint32_t fh)
{
S390PCIBusDevice *pbdev;
uint32_t idx = FH_MASK_INDEX & fh;
S390PCIBusDevice *pbdev = s390_pci_find_dev_by_idx(s, idx);
QTAILQ_FOREACH(pbdev, &s->zpci_devs, link) {
if (pbdev->fh == fh) {
if (pbdev && pbdev->fh == fh) {
return pbdev;
}
}
return NULL;
}
@ -584,6 +575,7 @@ static int s390_pcihost_init(SysBusDevice *dev)
s->iommu_table = g_hash_table_new_full(g_int64_hash, g_int64_equal,
NULL, g_free);
s->zpci_table = g_hash_table_new_full(g_int_hash, g_int_equal, NULL, NULL);
QTAILQ_INIT(&s->pending_sei);
QTAILQ_INIT(&s->zpci_devs);
return 0;
@ -735,6 +727,7 @@ static void s390_pcihost_hot_plug(HotplugHandler *hotplug_dev,
}
pbdev->fh = pbdev->idx;
QTAILQ_INSERT_TAIL(&s->zpci_devs, pbdev, link);
g_hash_table_insert(s->zpci_table, &pbdev->idx, pbdev);
}
}
@ -815,6 +808,7 @@ static void s390_pcihost_hot_unplug(HotplugHandler *hotplug_dev,
out:
pbdev->fid = 0;
QTAILQ_REMOVE(&s->zpci_devs, pbdev, link);
g_hash_table_remove(s->zpci_table, &pbdev->idx);
object_unparent(OBJECT(pbdev));
}

1
hw/s390x/s390-pci-bus.h
View File

@ -312,6 +312,7 @@ typedef struct S390pciState {
uint32_t next_idx;
S390PCIBus *bus;
GHashTable *iommu_table;
GHashTable *zpci_table;
QTAILQ_HEAD(, SeiContainer) pending_sei;
QTAILQ_HEAD(, S390PCIBusDevice) zpci_devs;
} S390pciState;