[Qemu-devel] [PATCH] pcie: fix device unplug timeout

["Zhangbo (Oscar)" <oscar.zhangbo@huawei.com>]

If the linux kernel only receives an ABP event during pcie unplug, it will sleep 5s 
to expect a PDC event, which will cause device unplug timeout.

In the meanwhile, if the kernel only receives a PDC event during the unplug, it
will wait for at least 1 second before checking card present as data link layer
state changed (link down) event reported prior to presence detect changed
(card is not present).

Therefore we can send both ABP and PDC events to the kernel in unplug process
to avoid unplug timeout.

Signed-off-by: limingwang@huawei.com
Signed-off-by: fangying1@huawei.com
Signed-off-by: oscar.zhangbo@huawei.com
---
 hw/pci/pcie.c         | 8 ++------
 include/hw/pci/pcie.h | 1 -
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 174f392..a800f23 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -485,7 +485,8 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev,
                                      PCI_EXP_LNKSTA_DLLLA);
     }
 
-    pcie_cap_slot_push_attention_button(PCI_DEVICE(hotplug_dev));
+    pcie_cap_slot_event(PCI_DEVICE(hotplug_dev),
+                        PCI_EXP_HP_EV_PDC | PCI_EXP_HP_EV_ABP);
 }
 
 /* pci express slot for pci express root/downstream port
@@ -701,11 +702,6 @@ int pcie_cap_slot_post_load(void *opaque, int version_id)
     return 0;
 }
 
-void pcie_cap_slot_push_attention_button(PCIDevice *dev)
-{
-    pcie_cap_slot_event(dev, PCI_EXP_HP_EV_ABP);
-}
-
 /* root control/capabilities/status. PME isn't emulated for now */
 void pcie_cap_root_init(PCIDevice *dev)
 {
diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h
index 8cf3361..0975a54 100644
--- a/include/hw/pci/pcie.h
+++ b/include/hw/pci/pcie.h
@@ -112,7 +112,6 @@ void pcie_cap_slot_write_config(PCIDevice *dev,
                                 uint16_t old_slt_ctl, uint16_t old_slt_sta,
                                 uint32_t addr, uint32_t val, int len);
 int pcie_cap_slot_post_load(void *opaque, int version_id);
-void pcie_cap_slot_push_attention_button(PCIDevice *dev);
 
 void pcie_cap_root_init(PCIDevice *dev);
 void pcie_cap_root_reset(PCIDevice *dev);
-- 
1.8.3.1