// SPDX-License-Identifier: GPL-2.0-or-later /* * The file intends to implement the platform dependent EEH operations on pseries. * Actually, the pseries platform is built based on RTAS heavily. That means the * pseries platform dependent EEH operations will be built on RTAS calls. The functions * are derived from arch/powerpc/platforms/pseries/eeh.c and necessary cleanup has * been done. * * Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2011. * Copyright IBM Corporation 2001, 2005, 2006 * Copyright Dave Engebretsen & Todd Inglett 2001 * Copyright Linas Vepstas 2005, 2006 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* RTAS tokens */ static int ibm_set_eeh_option; static int ibm_set_slot_reset; static int ibm_read_slot_reset_state; static int ibm_read_slot_reset_state2; static int ibm_slot_error_detail; static int ibm_get_config_addr_info; static int ibm_get_config_addr_info2; static int ibm_configure_pe; static void pseries_eeh_init_edev(struct pci_dn *pdn); static void pseries_pcibios_bus_add_device(struct pci_dev *pdev) { struct pci_dn *pdn = pci_get_pdn(pdev); if (eeh_has_flag(EEH_FORCE_DISABLED)) return; dev_dbg(&pdev->dev, "EEH: Setting up device\n"); #ifdef CONFIG_PCI_IOV if (pdev->is_virtfn) { pdn->device_id = pdev->device; pdn->vendor_id = pdev->vendor; pdn->class_code = pdev->class; /* * Last allow unfreeze return code used for retrieval * by user space in eeh-sysfs to show the last command * completion from platform. */ pdn->last_allow_rc = 0; } #endif pseries_eeh_init_edev(pdn); #ifdef CONFIG_PCI_IOV if (pdev->is_virtfn) { /* * FIXME: This really should be handled by choosing the right * parent PE in pseries_eeh_init_edev(). */ struct eeh_pe *physfn_pe = pci_dev_to_eeh_dev(pdev->physfn)->pe; struct eeh_dev *edev = pdn_to_eeh_dev(pdn); edev->pe_config_addr = (pdn->busno << 16) | (pdn->devfn << 8); eeh_pe_tree_remove(edev); /* Remove as it is adding to bus pe */ eeh_pe_tree_insert(edev, physfn_pe); /* Add as VF PE type */ } #endif eeh_probe_device(pdev); } /** * pseries_eeh_get_pe_config_addr - Find the pe_config_addr for a device * @pdn: pci_dn of the input device * * The EEH RTAS calls use a tuple consisting of: (buid_hi, buid_lo, * pe_config_addr) as a handle to a given PE. This function finds the * pe_config_addr based on the device's config addr. * * Keep in mind that the pe_config_addr *might* be numerically identical to the * device's config addr, but the two are conceptually distinct. * * Returns the pe_config_addr, or a negative error code. */ static int pseries_eeh_get_pe_config_addr(struct pci_dn *pdn) { int config_addr = rtas_config_addr(pdn->busno, pdn->devfn, 0); struct pci_controller *phb = pdn->phb; int ret, rets[3]; if (ibm_get_config_addr_info2 != RTAS_UNKNOWN_SERVICE) { /* * First of all, use function 1 to determine if this device is * part of a PE or not. ret[0] being zero indicates it's not. */ ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets, config_addr, BUID_HI(phb->buid), BUID_LO(phb->buid), 1); if (ret || (rets[0] == 0)) return -ENOENT; /* Retrieve the associated PE config address with function 0 */ ret = rtas_call(ibm_get_config_addr_info2, 4, 2, rets, config_addr, BUID_HI(phb->buid), BUID_LO(phb->buid), 0); if (ret) { pr_warn("%s: Failed to get address for PHB#%x-PE#%x\n", __func__, phb->global_number, config_addr); return -ENXIO; } return rets[0]; } if (ibm_get_config_addr_info != RTAS_UNKNOWN_SERVICE) { ret = rtas_call(ibm_get_config_addr_info, 4, 2, rets, config_addr, BUID_HI(phb->buid), BUID_LO(phb->buid), 0); if (ret) { pr_warn("%s: Failed to get address for PHB#%x-PE#%x\n", __func__, phb->global_number, config_addr); return -ENXIO; } return rets[0]; } /* * PAPR does describe a process for finding the pe_config_addr that was * used before the ibm,get-config-addr-info calls were added. However, * I haven't found *any* systems that don't have that RTAS call * implemented. If you happen to find one that needs the old DT based * process, patches are welcome! */ return -ENOENT; } /** * pseries_eeh_phb_reset - Reset the specified PHB * @phb: PCI controller * @config_addr: the associated config address * @option: reset option * * Reset the specified PHB/PE */ static int pseries_eeh_phb_reset(struct pci_controller *phb, int config_addr, int option) { int ret; /* Reset PE through RTAS call */ ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL, config_addr, BUID_HI(phb->buid), BUID_LO(phb->buid), option); /* If fundamental-reset not supported, try hot-reset */ if (option == EEH_RESET_FUNDAMENTAL && ret == -8) { option = EEH_RESET_HOT; ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL, config_addr, BUID_HI(phb->buid), BUID_LO(phb->buid), option); } /* We need reset hold or settlement delay */ if (option == EEH_RESET_FUNDAMENTAL || option == EEH_RESET_HOT) msleep(EEH_PE_RST_HOLD_TIME); else msleep(EEH_PE_RST_SETTLE_TIME); return ret; } /** * pseries_eeh_phb_configure_bridge - Configure PCI bridges in the indicated PE * @phb: PCI controller * @config_addr: the associated config address * * The function will be called to reconfigure the bridges included * in the specified PE so that the mulfunctional PE would be recovered * again. */ static int pseries_eeh_phb_configure_bridge(struct pci_controller *phb, int config_addr) { int ret; /* Waiting 0.2s maximum before skipping configuration */ int max_wait = 200; while (max_wait > 0) { ret = rtas_call(ibm_configure_pe, 3, 1, NULL, config_addr, BUID_HI(phb->buid), BUID_LO(phb->buid)); if (!ret) return ret; if (ret < 0) break; /* * If RTAS returns a delay value that's above 100ms, cut it * down to 100ms in case firmware made a mistake. For more * on how these delay values work see rtas_busy_delay_time */ if (ret > RTAS_EXTENDED_DELAY_MIN+2 && ret <= RTAS_EXTENDED_DELAY_MAX) ret = RTAS_EXTENDED_DELAY_MIN+2; max_wait -= rtas_busy_delay_time(ret); if (max_wait < 0) break; rtas_busy_delay(ret); } pr_warn("%s: Unable to configure bridge PHB#%x-PE#%x (%d)\n", __func__, phb->global_number, config_addr, ret); /* PAPR defines -3 as "Parameter Error" for this function: */ if (ret == -3) return -EINVAL; else return -EIO; } /* * Buffer for reporting slot-error-detail rtas calls. Its here * in BSS, and not dynamically alloced, so that it ends up in * RMO where RTAS can access it. */ static unsigned char slot_errbuf[RTAS_ERROR_LOG_MAX]; static DEFINE_SPINLOCK(slot_errbuf_lock); static int eeh_error_buf_size; static int pseries_eeh_cap_start(struct pci_dn *pdn) { u32 status; if (!pdn) return 0; rtas_pci_dn_read_config(pdn, PCI_STATUS, 2, &status); if (!(status & PCI_STATUS_CAP_LIST)) return 0; return PCI_CAPABILITY_LIST; } static int pseries_eeh_find_cap(struct pci_dn *pdn, int cap) { int pos = pseries_eeh_cap_start(pdn); int cnt = 48; /* Maximal number of capabilities */ u32 id; if (!pos) return 0; while (cnt--) { rtas_pci_dn_read_config(pdn, pos, 1, &pos); if (pos < 0x40) break; pos &= ~3; rtas_pci_dn_read_config(pdn, pos + PCI_CAP_LIST_ID, 1, &id); if (id == 0xff) break; if (id == cap) return pos; pos += PCI_CAP_LIST_NEXT; } return 0; } static int pseries_eeh_find_ecap(struct pci_dn *pdn, int cap) { struct eeh_dev *edev = pdn_to_eeh_dev(pdn); u32 header; int pos = 256; int ttl = (4096 - 256) / 8; if (!edev || !edev->pcie_cap) return 0; if (rtas_pci_dn_read_config(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL) return 0; else if (!header) return 0; while (ttl-- > 0) { if (PCI_EXT_CAP_ID(header) == cap && pos) return pos; pos = PCI_EXT_CAP_NEXT(header); if (pos < 256) break; if (rtas_pci_dn_read_config(pdn, pos, 4, &header) != PCIBIOS_SUCCESSFUL) break; } return 0; } /** * pseries_eeh_pe_get_parent - Retrieve the parent PE * @edev: EEH device * * The whole PEs existing in the system are organized as hierarchy * tree. The function is used to retrieve the parent PE according * to the parent EEH device. */ static struct eeh_pe *pseries_eeh_pe_get_parent(struct eeh_dev *edev) { struct eeh_dev *parent; struct pci_dn *pdn = eeh_dev_to_pdn(edev); /* * It might have the case for the indirect parent * EEH device already having associated PE, but * the direct parent EEH device doesn't have yet. */ if (edev->physfn) pdn = pci_get_pdn(edev->physfn); else pdn = pdn ? pdn->parent : NULL; while (pdn) { /* We're poking out of PCI territory */ parent = pdn_to_eeh_dev(pdn); if (!parent) return NULL; if (parent->pe) return parent->pe; pdn = pdn->parent; } return NULL; } /** * pseries_eeh_init_edev - initialise the eeh_dev and eeh_pe for a pci_dn * * @pdn: PCI device node * * When we discover a new PCI device via the device-tree we create a * corresponding pci_dn and we allocate, but don't initialise, an eeh_dev. * This function takes care of the initialisation and inserts the eeh_dev * into the correct eeh_pe. If no eeh_pe exists we'll allocate one. */ static void pseries_eeh_init_edev(struct pci_dn *pdn) { struct eeh_pe pe, *parent; struct eeh_dev *edev; u32 pcie_flags; int ret; if (WARN_ON_ONCE(!eeh_has_flag(EEH_PROBE_MODE_DEVTREE))) return; /* * Find the eeh_dev for this pdn. The storage for the eeh_dev was * allocated at the same time as the pci_dn. * * XXX: We should probably re-visit that. */ edev = pdn_to_eeh_dev(pdn); if (!edev) return; /* * If ->pe is set then we've already probed this device. We hit * this path when a pci_dev is removed and rescanned while recovering * a PE (i.e. for devices where the driver doesn't support error * recovery). */ if (edev->pe) return; /* Check class/vendor/device IDs */ if (!pdn->vendor_id || !pdn->device_id || !pdn->class_code) return; /* Skip for PCI-ISA bridge */ if ((pdn->class_code >> 8) == PCI_CLASS_BRIDGE_ISA) return; eeh_edev_dbg(edev, "Probing device\n"); /* * Update class code and mode of eeh device. We need * correctly reflects that current device is root port * or PCIe switch downstream port. */ edev->pcix_cap = pseries_eeh_find_cap(pdn, PCI_CAP_ID_PCIX); edev->pcie_cap = pseries_eeh_find_cap(pdn, PCI_CAP_ID_EXP); edev->aer_cap = pseries_eeh_find_ecap(pdn, PCI_EXT_CAP_ID_ERR); edev->mode &= 0xFFFFFF00; if ((pdn->class_code >> 8) == PCI_CLASS_BRIDGE_PCI) { edev->mode |= EEH_DEV_BRIDGE; if (edev->pcie_cap) { rtas_pci_dn_read_config(pdn, edev->pcie_cap + PCI_EXP_FLAGS, 2, &pcie_flags); pcie_flags = (pcie_flags & PCI_EXP_FLAGS_TYPE) >> 4; if (pcie_flags == PCI_EXP_TYPE_ROOT_PORT) edev->mode |= EEH_DEV_ROOT_PORT; else if (pcie_flags == PCI_EXP_TYPE_DOWNSTREAM) edev->mode |= EEH_DEV_DS_PORT; } } /* first up, find the pe_config_addr for the PE containing the device */ ret = pseries_eeh_get_pe_config_addr(pdn); if (ret < 0) { eeh_edev_dbg(edev, "Unable to find pe_config_addr\n"); goto err; } /* Try enable EEH on the fake PE */ memset(&pe, 0, sizeof(struct eeh_pe)); pe.phb = pdn->phb; pe.addr = ret; eeh_edev_dbg(edev, "Enabling EEH on device\n"); ret = eeh_ops->set_option(&pe, EEH_OPT_ENABLE); if (ret) { eeh_edev_dbg(edev, "EEH failed to enable on device (code %d)\n", ret); goto err; } edev->pe_config_addr = pe.addr; eeh_add_flag(EEH_ENABLED); parent = pseries_eeh_pe_get_parent(edev); eeh_pe_tree_insert(edev, parent); eeh_save_bars(edev); eeh_edev_dbg(edev, "EEH enabled for device"); return; err: eeh_edev_dbg(edev, "EEH is unsupported on device (code = %d)\n", ret); } static struct eeh_dev *pseries_eeh_probe(struct pci_dev *pdev) { struct eeh_dev *edev; struct pci_dn *pdn; pdn = pci_get_pdn_by_devfn(pdev->bus, pdev->devfn); if (!pdn) return NULL; /* * If the system supports EEH on this device then the eeh_dev was * configured and inserted into a PE in pseries_eeh_init_edev() */ edev = pdn_to_eeh_dev(pdn); if (!edev || !edev->pe) return NULL; return edev; } /** * pseries_eeh_init_edev_recursive - Enable EEH for the indicated device * @pdn: PCI device node * * This routine must be used to perform EEH initialization for the * indicated PCI device that was added after system boot (e.g. * hotplug, dlpar). */ void pseries_eeh_init_edev_recursive(struct pci_dn *pdn) { struct pci_dn *n; if (!pdn) return; list_for_each_entry(n, &pdn->child_list, list) pseries_eeh_init_edev_recursive(n); pseries_eeh_init_edev(pdn); } EXPORT_SYMBOL_GPL(pseries_eeh_init_edev_recursive); /** * pseries_eeh_set_option - Initialize EEH or MMIO/DMA reenable * @pe: EEH PE * @option: operation to be issued * * The function is used to control the EEH functionality globally. * Currently, following options are support according to PAPR: * Enable EEH, Disable EEH, Enable MMIO and Enable DMA */ static int pseries_eeh_set_option(struct eeh_pe *pe, int option) { int ret = 0; /* * When we're enabling or disabling EEH functionality on * the particular PE, the PE config address is possibly * unavailable. Therefore, we have to figure it out from * the FDT node. */ switch (option) { case EEH_OPT_DISABLE: case EEH_OPT_ENABLE: case EEH_OPT_THAW_MMIO: case EEH_OPT_THAW_DMA: break; case EEH_OPT_FREEZE_PE: /* Not support */ return 0; default: pr_err("%s: Invalid option %d\n", __func__, option); return -EINVAL; } ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL, pe->addr, BUID_HI(pe->phb->buid), BUID_LO(pe->phb->buid), option); return ret; } /** * pseries_eeh_get_state - Retrieve PE state * @pe: EEH PE * @delay: suggested time to wait if state is unavailable * * Retrieve the state of the specified PE. On RTAS compliant * pseries platform, there already has one dedicated RTAS function * for the purpose. It's notable that the associated PE config address * might be ready when calling the function. Therefore, endeavour to * use the PE config address if possible. Further more, there're 2 * RTAS calls for the purpose, we need to try the new one and back * to the old one if the new one couldn't work properly. */ static int pseries_eeh_get_state(struct eeh_pe *pe, int *delay) { int ret; int rets[4]; int result; if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) { ret = rtas_call(ibm_read_slot_reset_state2, 3, 4, rets, pe->addr, BUID_HI(pe->phb->buid), BUID_LO(pe->phb->buid)); } else if (ibm_read_slot_reset_state != RTAS_UNKNOWN_SERVICE) { /* Fake PE unavailable info */ rets[2] = 0; ret = rtas_call(ibm_read_slot_reset_state, 3, 3, rets, pe->addr, BUID_HI(pe->phb->buid), BUID_LO(pe->phb->buid)); } else { return EEH_STATE_NOT_SUPPORT; } if (ret) return ret; /* Parse the result out */ if (!rets[1]) return EEH_STATE_NOT_SUPPORT; switch(rets[0]) { case 0: result = EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE; break; case 1: result = EEH_STATE_RESET_ACTIVE | EEH_STATE_MMIO_ACTIVE | EEH_STATE_DMA_ACTIVE; break; case 2: result = 0; break; case 4: result = EEH_STATE_MMIO_ENABLED; break; case 5: if (rets[2]) { if (delay) *delay = rets[2]; result = EEH_STATE_UNAVAILABLE; } else { result = EEH_STATE_NOT_SUPPORT; } break; default: result = EEH_STATE_NOT_SUPPORT; } return result; } /** * pseries_eeh_reset - Reset the specified PE * @pe: EEH PE * @option: reset option * * Reset the specified PE */ static int pseries_eeh_reset(struct eeh_pe *pe, int option) { return pseries_eeh_phb_reset(pe->phb, pe->addr, option); } /** * pseries_eeh_get_log - Retrieve error log * @pe: EEH PE * @severity: temporary or permanent error log * @drv_log: driver log to be combined with retrieved error log * @len: length of driver log * * Retrieve the temporary or permanent error from the PE. * Actually, the error will be retrieved through the dedicated * RTAS call. */ static int pseries_eeh_get_log(struct eeh_pe *pe, int severity, char *drv_log, unsigned long len) { unsigned long flags; int ret; spin_lock_irqsave(&slot_errbuf_lock, flags); memset(slot_errbuf, 0, eeh_error_buf_size); ret = rtas_call(ibm_slot_error_detail, 8, 1, NULL, pe->addr, BUID_HI(pe->phb->buid), BUID_LO(pe->phb->buid), virt_to_phys(drv_log), len, virt_to_phys(slot_errbuf), eeh_error_buf_size, severity); if (!ret) log_error(slot_errbuf, ERR_TYPE_RTAS_LOG, 0); spin_unlock_irqrestore(&slot_errbuf_lock, flags); return ret; } /** * pseries_eeh_configure_bridge - Configure PCI bridges in the indicated PE * @pe: EEH PE * */ static int pseries_eeh_configure_bridge(struct eeh_pe *pe) { return pseries_eeh_phb_configure_bridge(pe->phb, pe->addr); } /** * pseries_eeh_read_config - Read PCI config space * @edev: EEH device handle * @where: PCI config space offset * @size: size to read * @val: return value * * Read config space from the speicifed device */ static int pseries_eeh_read_config(struct eeh_dev *edev, int where, int size, u32 *val) { struct pci_dn *pdn = eeh_dev_to_pdn(edev); return rtas_pci_dn_read_config(pdn, where, size, val); } /** * pseries_eeh_write_config - Write PCI config space * @edev: EEH device handle * @where: PCI config space offset * @size: size to write * @val: value to be written * * Write config space to the specified device */ static int pseries_eeh_write_config(struct eeh_dev *edev, int where, int size, u32 val) { struct pci_dn *pdn = eeh_dev_to_pdn(edev); return rtas_pci_dn_write_config(pdn, where, size, val); } #ifdef CONFIG_PCI_IOV static int pseries_send_allow_unfreeze(struct pci_dn *pdn, u16 *vf_pe_array, int cur_vfs) { int rc; int ibm_allow_unfreeze = rtas_function_token(RTAS_FN_IBM_OPEN_SRIOV_ALLOW_UNFREEZE); unsigned long buid, addr; addr = rtas_config_addr(pdn->busno, pdn->devfn, 0); buid = pdn->phb->buid; spin_lock(&rtas_data_buf_lock); memcpy(rtas_data_buf, vf_pe_array, RTAS_DATA_BUF_SIZE); rc = rtas_call(ibm_allow_unfreeze, 5, 1, NULL, addr, BUID_HI(buid), BUID_LO(buid), rtas_data_buf, cur_vfs * sizeof(u16)); spin_unlock(&rtas_data_buf_lock); if (rc) pr_warn("%s: Failed to allow unfreeze for PHB#%x-PE#%lx, rc=%x\n", __func__, pdn->phb->global_number, addr, rc); return rc; } static int pseries_call_allow_unfreeze(struct eeh_dev *edev) { int cur_vfs = 0, rc = 0, vf_index, bus, devfn, vf_pe_num; struct pci_dn *pdn, *tmp, *parent, *physfn_pdn; u16 *vf_pe_array; vf_pe_array = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); if (!vf_pe_array) return -ENOMEM; if (pci_num_vf(edev->physfn ? edev->physfn : edev->pdev)) { if (edev->pdev->is_physfn) { cur_vfs = pci_num_vf(edev->pdev); pdn = eeh_dev_to_pdn(edev); parent = pdn->parent; for (vf_index = 0; vf_index < cur_vfs; vf_index++) vf_pe_array[vf_index] = cpu_to_be16(pdn->pe_num_map[vf_index]); rc = pseries_send_allow_unfreeze(pdn, vf_pe_array, cur_vfs); pdn->last_allow_rc = rc; for (vf_index = 0; vf_index < cur_vfs; vf_index++) { list_for_each_entry_safe(pdn, tmp, &parent->child_list, list) { bus = pci_iov_virtfn_bus(edev->pdev, vf_index); devfn = pci_iov_virtfn_devfn(edev->pdev, vf_index); if (pdn->busno != bus || pdn->devfn != devfn) continue; pdn->last_allow_rc = rc; } } } else { pdn = pci_get_pdn(edev->pdev); physfn_pdn = pci_get_pdn(edev->physfn); vf_pe_num = physfn_pdn->pe_num_map[edev->vf_index]; vf_pe_array[0] = cpu_to_be16(vf_pe_num); rc = pseries_send_allow_unfreeze(physfn_pdn, vf_pe_array, 1); pdn->last_allow_rc = rc; } } kfree(vf_pe_array); return rc; } static int pseries_notify_resume(struct eeh_dev *edev) { if (!edev) return -EEXIST; if (rtas_function_token(RTAS_FN_IBM_OPEN_SRIOV_ALLOW_UNFREEZE) == RTAS_UNKNOWN_SERVICE) return -EINVAL; if (edev->pdev->is_physfn || edev->pdev->is_virtfn) return pseries_call_allow_unfreeze(edev); return 0; } #endif /** * pseries_eeh_err_inject - Inject specified error to the indicated PE * @pe: the indicated PE * @type: error type * @func: specific error type * @addr: address * @mask: address mask * The routine is called to inject specified error, which is * determined by @type and @func, to the indicated PE */ static int pseries_eeh_err_inject(struct eeh_pe *pe, int type, int func, unsigned long addr, unsigned long mask) { struct eeh_dev *pdev; /* Check on PCI error type */ if (type != EEH_ERR_TYPE_32 && type != EEH_ERR_TYPE_64) return -EINVAL; switch (func) { case EEH_ERR_FUNC_LD_MEM_ADDR: case EEH_ERR_FUNC_LD_MEM_DATA: case EEH_ERR_FUNC_ST_MEM_ADDR: case EEH_ERR_FUNC_ST_MEM_DATA: /* injects a MMIO error for all pdev's belonging to PE */ pci_lock_rescan_remove(); list_for_each_entry(pdev, &pe->edevs, entry) eeh_pe_inject_mmio_error(pdev->pdev); pci_unlock_rescan_remove(); break; default: return -ERANGE; } return 0; } static struct eeh_ops pseries_eeh_ops = { .name = "pseries", .probe = pseries_eeh_probe, .set_option = pseries_eeh_set_option, .get_state = pseries_eeh_get_state, .reset = pseries_eeh_reset, .get_log = pseries_eeh_get_log, .configure_bridge = pseries_eeh_configure_bridge, .err_inject = pseries_eeh_err_inject, .read_config = pseries_eeh_read_config, .write_config = pseries_eeh_write_config, .next_error = NULL, .restore_config = NULL, /* NB: configure_bridge() does this */ #ifdef CONFIG_PCI_IOV .notify_resume = pseries_notify_resume #endif }; /** * eeh_pseries_init - Register platform dependent EEH operations * * EEH initialization on pseries platform. This function should be * called before any EEH related functions. */ static int __init eeh_pseries_init(void) { struct pci_controller *phb; struct pci_dn *pdn; int ret, config_addr; /* figure out EEH RTAS function call tokens */ ibm_set_eeh_option = rtas_function_token(RTAS_FN_IBM_SET_EEH_OPTION); ibm_set_slot_reset = rtas_function_token(RTAS_FN_IBM_SET_SLOT_RESET); ibm_read_slot_reset_state2 = rtas_function_token(RTAS_FN_IBM_READ_SLOT_RESET_STATE2); ibm_read_slot_reset_state = rtas_function_token(RTAS_FN_IBM_READ_SLOT_RESET_STATE); ibm_slot_error_detail = rtas_function_token(RTAS_FN_IBM_SLOT_ERROR_DETAIL); ibm_get_config_addr_info2 = rtas_function_token(RTAS_FN_IBM_GET_CONFIG_ADDR_INFO2); ibm_get_config_addr_info = rtas_function_token(RTAS_FN_IBM_GET_CONFIG_ADDR_INFO); ibm_configure_pe = rtas_function_token(RTAS_FN_IBM_CONFIGURE_PE); /* * ibm,configure-pe and ibm,configure-bridge have the same semantics, * however ibm,configure-pe can be faster. If we can't find * ibm,configure-pe then fall back to using ibm,configure-bridge. */ if (ibm_configure_pe == RTAS_UNKNOWN_SERVICE) ibm_configure_pe = rtas_function_token(RTAS_FN_IBM_CONFIGURE_BRIDGE); /* * Necessary sanity check. We needn't check "get-config-addr-info" * and its variant since the old firmware probably support address * of domain/bus/slot/function for EEH RTAS operations. */ if (ibm_set_eeh_option == RTAS_UNKNOWN_SERVICE || ibm_set_slot_reset == RTAS_UNKNOWN_SERVICE || (ibm_read_slot_reset_state2 == RTAS_UNKNOWN_SERVICE && ibm_read_slot_reset_state == RTAS_UNKNOWN_SERVICE) || ibm_slot_error_detail == RTAS_UNKNOWN_SERVICE || ibm_configure_pe == RTAS_UNKNOWN_SERVICE) { pr_info("EEH functionality not supported\n"); return -EINVAL; } /* Initialize error log size */ eeh_error_buf_size = rtas_get_error_log_max(); /* Set EEH probe mode */ eeh_add_flag(EEH_PROBE_MODE_DEVTREE | EEH_ENABLE_IO_FOR_LOG); /* Set EEH machine dependent code */ ppc_md.pcibios_bus_add_device = pseries_pcibios_bus_add_device; if (is_kdump_kernel() || reset_devices) { pr_info("Issue PHB reset ...\n"); list_for_each_entry(phb, &hose_list, list_node) { // Skip if the slot is empty if (list_empty(&PCI_DN(phb->dn)->child_list)) continue; pdn = list_first_entry(&PCI_DN(phb->dn)->child_list, struct pci_dn, list); config_addr = pseries_eeh_get_pe_config_addr(pdn); /* invalid PE config addr */ if (config_addr < 0) continue; pseries_eeh_phb_reset(phb, config_addr, EEH_RESET_FUNDAMENTAL); pseries_eeh_phb_reset(phb, config_addr, EEH_RESET_DEACTIVATE); pseries_eeh_phb_configure_bridge(phb, config_addr); } } ret = eeh_init(&pseries_eeh_ops); if (!ret) pr_info("EEH: pSeries platform initialized\n"); else pr_info("EEH: pSeries platform initialization failure (%d)\n", ret); return ret; } machine_arch_initcall(pseries, eeh_pseries_init);