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 "hw/ppc/spapr.h" 23 #include "hw/pci-host/spapr.h" 24 #include "hw/pci/msix.h" 25 #include "hw/pci/pci_device.h" 26 #include "hw/vfio/vfio.h" 27 #include "qemu/error-report.h" 28 29 bool spapr_phb_eeh_available(SpaprPhbState *sphb) 30 { 31 return vfio_eeh_as_ok(&sphb->iommu_as); 32 } 33 34 static void spapr_phb_vfio_eeh_reenable(SpaprPhbState *sphb) 35 { 36 vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_ENABLE); 37 } 38 39 void spapr_phb_vfio_reset(DeviceState *qdev) 40 { 41 /* 42 * The PE might be in frozen state. To reenable the EEH 43 * functionality on it will clean the frozen state, which 44 * ensures that the contained PCI devices will work properly 45 * after reboot. 46 */ 47 spapr_phb_vfio_eeh_reenable(SPAPR_PCI_HOST_BRIDGE(qdev)); 48 } 49 50 static void spapr_eeh_pci_find_device(PCIBus *bus, PCIDevice *pdev, 51 void *opaque) 52 { 53 bool *found = opaque; 54 55 if (object_dynamic_cast(OBJECT(pdev), "vfio-pci")) { 56 *found = true; 57 } 58 } 59 60 int spapr_phb_vfio_eeh_set_option(SpaprPhbState *sphb, 61 unsigned int addr, int option) 62 { 63 uint32_t op; 64 int ret; 65 66 switch (option) { 67 case RTAS_EEH_DISABLE: 68 op = VFIO_EEH_PE_DISABLE; 69 break; 70 case RTAS_EEH_ENABLE: { 71 PCIHostState *phb; 72 bool found = false; 73 74 /* 75 * The EEH functionality is enabled per sphb level instead of 76 * per PCI device. We have already identified this specific sphb 77 * based on buid passed as argument to ibm,set-eeh-option rtas 78 * call. Now we just need to check the validity of the PCI 79 * pass-through devices (vfio-pci) under this sphb bus. 80 * We have already validated that all the devices under this sphb 81 * are from same iommu group (within same PE) before coming here. 82 * 83 * Prior to linux commit 98ba956f6a389 ("powerpc/pseries/eeh: 84 * Rework device EEH PE determination") kernel would call 85 * eeh-set-option for each device in the PE using the device's 86 * config_address as the argument rather than the PE address. 87 * Hence if we check validity of supplied config_addr whether 88 * it matches to this PHB will cause issues with older kernel 89 * versions v5.9 and older. If we return an error from 90 * eeh-set-option when the argument isn't a valid PE address 91 * then older kernels (v5.9 and older) will interpret that as 92 * EEH not being supported. 93 */ 94 phb = PCI_HOST_BRIDGE(sphb); 95 pci_for_each_device(phb->bus, (addr >> 16) & 0xFF, 96 spapr_eeh_pci_find_device, &found); 97 98 if (!found) { 99 return RTAS_OUT_PARAM_ERROR; 100 } 101 102 op = VFIO_EEH_PE_ENABLE; 103 break; 104 } 105 case RTAS_EEH_THAW_IO: 106 op = VFIO_EEH_PE_UNFREEZE_IO; 107 break; 108 case RTAS_EEH_THAW_DMA: 109 op = VFIO_EEH_PE_UNFREEZE_DMA; 110 break; 111 default: 112 return RTAS_OUT_PARAM_ERROR; 113 } 114 115 ret = vfio_eeh_as_op(&sphb->iommu_as, op); 116 if (ret < 0) { 117 return RTAS_OUT_HW_ERROR; 118 } 119 120 return RTAS_OUT_SUCCESS; 121 } 122 123 int spapr_phb_vfio_eeh_get_state(SpaprPhbState *sphb, int *state) 124 { 125 int ret; 126 127 ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_GET_STATE); 128 if (ret < 0) { 129 return RTAS_OUT_PARAM_ERROR; 130 } 131 132 *state = ret; 133 return RTAS_OUT_SUCCESS; 134 } 135 136 static void spapr_phb_vfio_eeh_clear_dev_msix(PCIBus *bus, 137 PCIDevice *pdev, 138 void *opaque) 139 { 140 /* Check if the device is VFIO PCI device */ 141 if (!object_dynamic_cast(OBJECT(pdev), "vfio-pci")) { 142 return; 143 } 144 145 /* 146 * The MSIx table will be cleaned out by reset. We need 147 * disable it so that it can be reenabled properly. Also, 148 * the cached MSIx table should be cleared as it's not 149 * reflecting the contents in hardware. 150 */ 151 if (msix_enabled(pdev)) { 152 uint16_t flags; 153 154 flags = pci_host_config_read_common(pdev, 155 pdev->msix_cap + PCI_MSIX_FLAGS, 156 pci_config_size(pdev), 2); 157 flags &= ~PCI_MSIX_FLAGS_ENABLE; 158 pci_host_config_write_common(pdev, 159 pdev->msix_cap + PCI_MSIX_FLAGS, 160 pci_config_size(pdev), flags, 2); 161 } 162 163 msix_reset(pdev); 164 } 165 166 static void spapr_phb_vfio_eeh_clear_bus_msix(PCIBus *bus, void *opaque) 167 { 168 pci_for_each_device_under_bus(bus, spapr_phb_vfio_eeh_clear_dev_msix, 169 NULL); 170 } 171 172 static void spapr_phb_vfio_eeh_pre_reset(SpaprPhbState *sphb) 173 { 174 PCIHostState *phb = PCI_HOST_BRIDGE(sphb); 175 176 pci_for_each_bus(phb->bus, spapr_phb_vfio_eeh_clear_bus_msix, NULL); 177 } 178 179 int spapr_phb_vfio_eeh_reset(SpaprPhbState *sphb, int option) 180 { 181 uint32_t op; 182 int ret; 183 184 switch (option) { 185 case RTAS_SLOT_RESET_DEACTIVATE: 186 op = VFIO_EEH_PE_RESET_DEACTIVATE; 187 break; 188 case RTAS_SLOT_RESET_HOT: 189 spapr_phb_vfio_eeh_pre_reset(sphb); 190 op = VFIO_EEH_PE_RESET_HOT; 191 break; 192 case RTAS_SLOT_RESET_FUNDAMENTAL: 193 spapr_phb_vfio_eeh_pre_reset(sphb); 194 op = VFIO_EEH_PE_RESET_FUNDAMENTAL; 195 break; 196 default: 197 return RTAS_OUT_PARAM_ERROR; 198 } 199 200 ret = vfio_eeh_as_op(&sphb->iommu_as, op); 201 if (ret < 0) { 202 return RTAS_OUT_HW_ERROR; 203 } 204 205 return RTAS_OUT_SUCCESS; 206 } 207 208 int spapr_phb_vfio_eeh_configure(SpaprPhbState *sphb) 209 { 210 int ret; 211 212 ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_CONFIGURE); 213 if (ret < 0) { 214 return RTAS_OUT_PARAM_ERROR; 215 } 216 217 return RTAS_OUT_SUCCESS; 218 } 219