hw/ppc/spapr_pci_vfio.c

   1 /*
   2  * QEMU sPAPR PCI host for VFIO
   3  *
   4  * Copyright (c) 2011-2014 Alexey Kardashevskiy, IBM Corporation.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License,
   9  *  or (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include <linux/vfio.h>
  22 #include "qemu-common.h"
  23 #include "cpu.h"
  24 #include "hw/ppc/spapr.h"
  25 #include "hw/pci-host/spapr.h"
  26 #include "hw/pci/msix.h"
  27 #include "hw/vfio/vfio.h"
  28 #include "qemu/error-report.h"
  29 #include "sysemu/qtest.h"
  30
  31 bool spapr_phb_eeh_available(sPAPRPHBState *sphb)
  32 {
  33     return vfio_eeh_as_ok(&sphb->iommu_as);
  34 }
  35
  36 static void spapr_phb_vfio_eeh_reenable(sPAPRPHBState *sphb)
  37 {
  38     vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_ENABLE);
  39 }
  40
  41 void spapr_phb_vfio_reset(DeviceState *qdev)
  42 {
  43     /*
  44      * The PE might be in frozen state. To reenable the EEH
  45      * functionality on it will clean the frozen state, which
  46      * ensures that the contained PCI devices will work properly
  47      * after reboot.
  48      */
  49     spapr_phb_vfio_eeh_reenable(SPAPR_PCI_HOST_BRIDGE(qdev));
  50 }
  51
  52 int spapr_phb_vfio_eeh_set_option(sPAPRPHBState *sphb,
  53                                   unsigned int addr, int option)
  54 {
  55     uint32_t op;
  56     int ret;
  57
  58     switch (option) {
  59     case RTAS_EEH_DISABLE:
  60         op = VFIO_EEH_PE_DISABLE;
  61         break;
  62     case RTAS_EEH_ENABLE: {
  63         PCIHostState *phb;
  64         PCIDevice *pdev;
  65
  66         /*
  67          * The EEH functionality is enabled on basis of PCI device,
  68          * instead of PE. We need check the validity of the PCI
  69          * device address.
  70          */
  71         phb = PCI_HOST_BRIDGE(sphb);
  72         pdev = pci_find_device(phb->bus,
  73                                (addr >> 16) & 0xFF, (addr >> 8) & 0xFF);
  74         if (!pdev || !object_dynamic_cast(OBJECT(pdev), "vfio-pci")) {
  75             return RTAS_OUT_PARAM_ERROR;
  76         }
  77
  78         op = VFIO_EEH_PE_ENABLE;
  79         break;
  80     }
  81     case RTAS_EEH_THAW_IO:
  82         op = VFIO_EEH_PE_UNFREEZE_IO;
  83         break;
  84     case RTAS_EEH_THAW_DMA:
  85         op = VFIO_EEH_PE_UNFREEZE_DMA;
  86         break;
  87     default:
  88         return RTAS_OUT_PARAM_ERROR;
  89     }
  90
  91     ret = vfio_eeh_as_op(&sphb->iommu_as, op);
  92     if (ret < 0) {
  93         return RTAS_OUT_HW_ERROR;
  94     }
  95
  96     return RTAS_OUT_SUCCESS;
  97 }
  98
  99 int spapr_phb_vfio_eeh_get_state(sPAPRPHBState *sphb, int *state)
 100 {
 101     int ret;
 102
 103     ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_GET_STATE);
 104     if (ret < 0) {
 105         return RTAS_OUT_PARAM_ERROR;
 106     }
 107
 108     *state = ret;
 109     return RTAS_OUT_SUCCESS;
 110 }
 111
 112 static void spapr_phb_vfio_eeh_clear_dev_msix(PCIBus *bus,
 113                                               PCIDevice *pdev,
 114                                               void *opaque)
 115 {
 116     /* Check if the device is VFIO PCI device */
 117     if (!object_dynamic_cast(OBJECT(pdev), "vfio-pci")) {
 118         return;
 119     }
 120
 121     /*
 122      * The MSIx table will be cleaned out by reset. We need
 123      * disable it so that it can be reenabled properly. Also,
 124      * the cached MSIx table should be cleared as it's not
 125      * reflecting the contents in hardware.
 126      */
 127     if (msix_enabled(pdev)) {
 128         uint16_t flags;
 129
 130         flags = pci_host_config_read_common(pdev,
 131                                             pdev->msix_cap + PCI_MSIX_FLAGS,
 132                                             pci_config_size(pdev), 2);
 133         flags &= ~PCI_MSIX_FLAGS_ENABLE;
 134         pci_host_config_write_common(pdev,
 135                                      pdev->msix_cap + PCI_MSIX_FLAGS,
 136                                      pci_config_size(pdev), flags, 2);
 137     }
 138
 139     msix_reset(pdev);
 140 }
 141
 142 static void spapr_phb_vfio_eeh_clear_bus_msix(PCIBus *bus, void *opaque)
 143 {
 144        pci_for_each_device(bus, pci_bus_num(bus),
 145                            spapr_phb_vfio_eeh_clear_dev_msix, NULL);
 146 }
 147
 148 static void spapr_phb_vfio_eeh_pre_reset(sPAPRPHBState *sphb)
 149 {
 150        PCIHostState *phb = PCI_HOST_BRIDGE(sphb);
 151
 152        pci_for_each_bus(phb->bus, spapr_phb_vfio_eeh_clear_bus_msix, NULL);
 153 }
 154
 155 int spapr_phb_vfio_eeh_reset(sPAPRPHBState *sphb, int option)
 156 {
 157     uint32_t op;
 158     int ret;
 159
 160     switch (option) {
 161     case RTAS_SLOT_RESET_DEACTIVATE:
 162         op = VFIO_EEH_PE_RESET_DEACTIVATE;
 163         break;
 164     case RTAS_SLOT_RESET_HOT:
 165         spapr_phb_vfio_eeh_pre_reset(sphb);
 166         op = VFIO_EEH_PE_RESET_HOT;
 167         break;
 168     case RTAS_SLOT_RESET_FUNDAMENTAL:
 169         spapr_phb_vfio_eeh_pre_reset(sphb);
 170         op = VFIO_EEH_PE_RESET_FUNDAMENTAL;
 171         break;
 172     default:
 173         return RTAS_OUT_PARAM_ERROR;
 174     }
 175
 176     ret = vfio_eeh_as_op(&sphb->iommu_as, op);
 177     if (ret < 0) {
 178         return RTAS_OUT_HW_ERROR;
 179     }
 180
 181     return RTAS_OUT_SUCCESS;
 182 }
 183
 184 int spapr_phb_vfio_eeh_configure(sPAPRPHBState *sphb)
 185 {
 186     int ret;
 187
 188     ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_CONFIGURE);
 189     if (ret < 0) {
 190         return RTAS_OUT_PARAM_ERROR;
 191     }
 192
 193     return RTAS_OUT_SUCCESS;
 194 }