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/*
* QEMU sPAPR PCI host for VFIO
*
* Copyright (c) 2011-2014 Alexey Kardashevskiy, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include <linux/vfio.h>
#include "hw/ppc/spapr.h"
#include "hw/pci-host/spapr.h"
#include "hw/pci/msix.h"
#include "hw/vfio/vfio.h"
#include "qemu/error-report.h"
bool spapr_phb_eeh_available(SpaprPhbState *sphb)
{
return vfio_eeh_as_ok(&sphb->iommu_as);
}
static void spapr_phb_vfio_eeh_reenable(SpaprPhbState *sphb)
{
vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_ENABLE);
}
void spapr_phb_vfio_reset(DeviceState *qdev)
{
/*
* The PE might be in frozen state. To reenable the EEH
* functionality on it will clean the frozen state, which
* ensures that the contained PCI devices will work properly
* after reboot.
*/
spapr_phb_vfio_eeh_reenable(SPAPR_PCI_HOST_BRIDGE(qdev));
}
static void spapr_eeh_pci_find_device(PCIBus *bus, PCIDevice *pdev,
void *opaque)
{
bool *found = opaque;
if (object_dynamic_cast(OBJECT(pdev), "vfio-pci")) {
*found = true;
}
}
int spapr_phb_vfio_eeh_set_option(SpaprPhbState *sphb,
unsigned int addr, int option)
{
uint32_t op;
int ret;
switch (option) {
case RTAS_EEH_DISABLE:
op = VFIO_EEH_PE_DISABLE;
break;
case RTAS_EEH_ENABLE: {
PCIHostState *phb;
bool found = false;
/*
* The EEH functionality is enabled per sphb level instead of
* per PCI device. We have already identified this specific sphb
* based on buid passed as argument to ibm,set-eeh-option rtas
* call. Now we just need to check the validity of the PCI
* pass-through devices (vfio-pci) under this sphb bus.
* We have already validated that all the devices under this sphb
* are from same iommu group (within same PE) before comming here.
*
* Prior to linux commit 98ba956f6a389 ("powerpc/pseries/eeh:
* Rework device EEH PE determination") kernel would call
* eeh-set-option for each device in the PE using the device's
* config_address as the argument rather than the PE address.
* Hence if we check validity of supplied config_addr whether
* it matches to this PHB will cause issues with older kernel
* versions v5.9 and older. If we return an error from
* eeh-set-option when the argument isn't a valid PE address
* then older kernels (v5.9 and older) will interpret that as
* EEH not being supported.
*/
phb = PCI_HOST_BRIDGE(sphb);
pci_for_each_device(phb->bus, (addr >> 16) & 0xFF,
spapr_eeh_pci_find_device, &found);
if (!found) {
return RTAS_OUT_PARAM_ERROR;
}
op = VFIO_EEH_PE_ENABLE;
break;
}
case RTAS_EEH_THAW_IO:
op = VFIO_EEH_PE_UNFREEZE_IO;
break;
case RTAS_EEH_THAW_DMA:
op = VFIO_EEH_PE_UNFREEZE_DMA;
break;
default:
return RTAS_OUT_PARAM_ERROR;
}
ret = vfio_eeh_as_op(&sphb->iommu_as, op);
if (ret < 0) {
return RTAS_OUT_HW_ERROR;
}
return RTAS_OUT_SUCCESS;
}
int spapr_phb_vfio_eeh_get_state(SpaprPhbState *sphb, int *state)
{
int ret;
ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_GET_STATE);
if (ret < 0) {
return RTAS_OUT_PARAM_ERROR;
}
*state = ret;
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_under_bus(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);
}
int spapr_phb_vfio_eeh_reset(SpaprPhbState *sphb, int option)
{
uint32_t op;
int ret;
switch (option) {
case RTAS_SLOT_RESET_DEACTIVATE:
op = VFIO_EEH_PE_RESET_DEACTIVATE;
break;
case RTAS_SLOT_RESET_HOT:
spapr_phb_vfio_eeh_pre_reset(sphb);
op = VFIO_EEH_PE_RESET_HOT;
break;
case RTAS_SLOT_RESET_FUNDAMENTAL:
spapr_phb_vfio_eeh_pre_reset(sphb);
op = VFIO_EEH_PE_RESET_FUNDAMENTAL;
break;
default:
return RTAS_OUT_PARAM_ERROR;
}
ret = vfio_eeh_as_op(&sphb->iommu_as, op);
if (ret < 0) {
return RTAS_OUT_HW_ERROR;
}
return RTAS_OUT_SUCCESS;
}
int spapr_phb_vfio_eeh_configure(SpaprPhbState *sphb)
{
int ret;
ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_CONFIGURE);
if (ret < 0) {
return RTAS_OUT_PARAM_ERROR;
}
return RTAS_OUT_SUCCESS;
}
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