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authorGavin Shan <gwshan@linux.vnet.ibm.com>2015-07-02 16:23:28 +1000
committerAlexander Graf <agraf@suse.de>2015-07-07 17:44:54 +0200
commit6319b1dad04e66f450fb3ac6c31d2bf3940068b8 (patch)
tree3a6910bb0a7b7adbf58e104dc2cd258008d71db5 /hw
parentaef87d1b879416909a4ac73e6fe2cea4a5630f40 (diff)
sPAPR: Clear stale MSIx table during EEH reset
The PCI device MSIx table is cleaned out in hardware after EEH PE reset. However, we still hold the stale MSIx entries in QEMU, which should be cleared accordingly. Otherwise, we will run into another (recursive) EEH error and the PCI devices contained in the PE have to be offlined exceptionally. The patch introduces function spapr_phb_vfio_eeh_pre_reset(), which is called by sPAPR when asserting hot or fundamental reset, to clear stale MSIx table for VFIO PCI devices before EEH PE reset so that MSIx table could be restored properly after EEH PE reset. Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'hw')
-rw-r--r--hw/ppc/spapr_pci_vfio.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/hw/ppc/spapr_pci_vfio.c b/hw/ppc/spapr_pci_vfio.c
index 8104074798..cca45ed312 100644
--- a/hw/ppc/spapr_pci_vfio.c
+++ b/hw/ppc/spapr_pci_vfio.c
@@ -19,6 +19,7 @@
#include "hw/ppc/spapr.h"
#include "hw/pci-host/spapr.h"
+#include "hw/pci/msix.h"
#include "linux/vfio.h"
#include "hw/vfio/vfio.h"
@@ -159,6 +160,49 @@ static int spapr_phb_vfio_eeh_get_state(sPAPRPHBState *sphb, int *state)
return RTAS_OUT_SUCCESS;
}
+static void spapr_phb_vfio_eeh_clear_dev_msix(PCIBus *bus,
+ PCIDevice *pdev,
+ void *opaque)
+{
+ /* Check if the device is VFIO PCI device */
+ if (!object_dynamic_cast(OBJECT(pdev), "vfio-pci")) {
+ return;
+ }
+
+ /*
+ * The MSIx table will be cleaned out by reset. We need
+ * disable it so that it can be reenabled properly. Also,
+ * the cached MSIx table should be cleared as it's not
+ * reflecting the contents in hardware.
+ */
+ if (msix_enabled(pdev)) {
+ uint16_t flags;
+
+ flags = pci_host_config_read_common(pdev,
+ pdev->msix_cap + PCI_MSIX_FLAGS,
+ pci_config_size(pdev), 2);
+ flags &= ~PCI_MSIX_FLAGS_ENABLE;
+ pci_host_config_write_common(pdev,
+ pdev->msix_cap + PCI_MSIX_FLAGS,
+ pci_config_size(pdev), flags, 2);
+ }
+
+ msix_reset(pdev);
+}
+
+static void spapr_phb_vfio_eeh_clear_bus_msix(PCIBus *bus, void *opaque)
+{
+ pci_for_each_device(bus, pci_bus_num(bus),
+ spapr_phb_vfio_eeh_clear_dev_msix, NULL);
+}
+
+static void spapr_phb_vfio_eeh_pre_reset(sPAPRPHBState *sphb)
+{
+ PCIHostState *phb = PCI_HOST_BRIDGE(sphb);
+
+ pci_for_each_bus(phb->bus, spapr_phb_vfio_eeh_clear_bus_msix, NULL);
+}
+
static int spapr_phb_vfio_eeh_reset(sPAPRPHBState *sphb, int option)
{
sPAPRPHBVFIOState *svphb = SPAPR_PCI_VFIO_HOST_BRIDGE(sphb);
@@ -170,9 +214,11 @@ static int spapr_phb_vfio_eeh_reset(sPAPRPHBState *sphb, int option)
op.op = VFIO_EEH_PE_RESET_DEACTIVATE;
break;
case RTAS_SLOT_RESET_HOT:
+ spapr_phb_vfio_eeh_pre_reset(sphb);
op.op = VFIO_EEH_PE_RESET_HOT;
break;
case RTAS_SLOT_RESET_FUNDAMENTAL:
+ spapr_phb_vfio_eeh_pre_reset(sphb);
op.op = VFIO_EEH_PE_RESET_FUNDAMENTAL;
break;
default: