powerpc/powernv: Bail upon invalid master PE

[mirror_ubuntu-artful-kernel.git] / arch / powerpc / platforms / powernv / pci-ioda.c

/*
 * Support PCI/PCIe on PowerNV platforms
 *
 * Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
 *
 * 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.
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/crash_dump.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/msi.h>
#include <linux/memblock.h>

#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/msi_bitmap.h>
#include <asm/ppc-pci.h>
#include <asm/opal.h>
#include <asm/iommu.h>
#include <asm/tce.h>
#include <asm/xics.h>
#include <asm/debug.h>
#include <asm/firmware.h>
#include <asm/pnv-pci.h>

#include <misc/cxl.h>

#include "powernv.h"
#include "pci.h"

static void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level,
                            const char *fmt, ...)
{
        struct va_format vaf;
        va_list args;
        char pfix[32];

        va_start(args, fmt);

        vaf.fmt = fmt;
        vaf.va = &args;

        if (pe->pdev)
                strlcpy(pfix, dev_name(&pe->pdev->dev), sizeof(pfix));
        else
                sprintf(pfix, "%04x:%02x     ",
                        pci_domain_nr(pe->pbus), pe->pbus->number);

        printk("%spci %s: [PE# %.3d] %pV",
               level, pfix, pe->pe_number, &vaf);

        va_end(args);
}

#define pe_err(pe, fmt, ...)                                    \
        pe_level_printk(pe, KERN_ERR, fmt, ##__VA_ARGS__)
#define pe_warn(pe, fmt, ...)                                   \
        pe_level_printk(pe, KERN_WARNING, fmt, ##__VA_ARGS__)
#define pe_info(pe, fmt, ...)                                   \
        pe_level_printk(pe, KERN_INFO, fmt, ##__VA_ARGS__)

/*
 * stdcix is only supposed to be used in hypervisor real mode as per
 * the architecture spec
 */
static inline void __raw_rm_writeq(u64 val, volatile void __iomem *paddr)
{
        __asm__ __volatile__("stdcix %0,0,%1"
                : : "r" (val), "r" (paddr) : "memory");
}

static inline bool pnv_pci_is_mem_pref_64(unsigned long flags)
{
        return ((flags & (IORESOURCE_MEM_64 | IORESOURCE_PREFETCH)) ==
                (IORESOURCE_MEM_64 | IORESOURCE_PREFETCH));
}

static void pnv_ioda_reserve_pe(struct pnv_phb *phb, int pe_no)
{
        if (!(pe_no >= 0 && pe_no < phb->ioda.total_pe)) {
                pr_warn("%s: Invalid PE %d on PHB#%x\n",
                        __func__, pe_no, phb->hose->global_number);
                return;
        }

        if (test_and_set_bit(pe_no, phb->ioda.pe_alloc)) {
                pr_warn("%s: PE %d was assigned on PHB#%x\n",
                        __func__, pe_no, phb->hose->global_number);
                return;
        }

        phb->ioda.pe_array[pe_no].phb = phb;
        phb->ioda.pe_array[pe_no].pe_number = pe_no;
}

static int pnv_ioda_alloc_pe(struct pnv_phb *phb)
{
        unsigned long pe;

        do {
                pe = find_next_zero_bit(phb->ioda.pe_alloc,
                                        phb->ioda.total_pe, 0);
                if (pe >= phb->ioda.total_pe)
                        return IODA_INVALID_PE;
        } while(test_and_set_bit(pe, phb->ioda.pe_alloc));

        phb->ioda.pe_array[pe].phb = phb;
        phb->ioda.pe_array[pe].pe_number = pe;
        return pe;
}

static void pnv_ioda_free_pe(struct pnv_phb *phb, int pe)
{
        WARN_ON(phb->ioda.pe_array[pe].pdev);

        memset(&phb->ioda.pe_array[pe], 0, sizeof(struct pnv_ioda_pe));
        clear_bit(pe, phb->ioda.pe_alloc);
}

/* The default M64 BAR is shared by all PEs */
static int pnv_ioda2_init_m64(struct pnv_phb *phb)
{
        const char *desc;
        struct resource *r;
        s64 rc;

        /* Configure the default M64 BAR */
        rc = opal_pci_set_phb_mem_window(phb->opal_id,
                                         OPAL_M64_WINDOW_TYPE,
                                         phb->ioda.m64_bar_idx,
                                         phb->ioda.m64_base,
                                         0, /* unused */
                                         phb->ioda.m64_size);
        if (rc != OPAL_SUCCESS) {
                desc = "configuring";
                goto fail;
        }

        /* Enable the default M64 BAR */
        rc = opal_pci_phb_mmio_enable(phb->opal_id,
                                      OPAL_M64_WINDOW_TYPE,
                                      phb->ioda.m64_bar_idx,
                                      OPAL_ENABLE_M64_SPLIT);
        if (rc != OPAL_SUCCESS) {
                desc = "enabling";
                goto fail;
        }

        /* Mark the M64 BAR assigned */
        set_bit(phb->ioda.m64_bar_idx, &phb->ioda.m64_bar_alloc);

        /*
         * Strip off the segment used by the reserved PE, which is
         * expected to be 0 or last one of PE capabicity.
         */
        r = &phb->hose->mem_resources[1];
        if (phb->ioda.reserved_pe == 0)
                r->start += phb->ioda.m64_segsize;
        else if (phb->ioda.reserved_pe == (phb->ioda.total_pe - 1))
                r->end -= phb->ioda.m64_segsize;
        else
                pr_warn("  Cannot strip M64 segment for reserved PE#%d\n",
                        phb->ioda.reserved_pe);

        return 0;

fail:
        pr_warn("  Failure %lld %s M64 BAR#%d\n",
                rc, desc, phb->ioda.m64_bar_idx);
        opal_pci_phb_mmio_enable(phb->opal_id,
                                 OPAL_M64_WINDOW_TYPE,
                                 phb->ioda.m64_bar_idx,
                                 OPAL_DISABLE_M64);
        return -EIO;
}

static void pnv_ioda2_reserve_m64_pe(struct pnv_phb *phb)
{
        resource_size_t sgsz = phb->ioda.m64_segsize;
        struct pci_dev *pdev;
        struct resource *r;
        int base, step, i;

        /*
         * Root bus always has full M64 range and root port has
         * M64 range used in reality. So we're checking root port
         * instead of root bus.
         */
        list_for_each_entry(pdev, &phb->hose->bus->devices, bus_list) {
                for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
                        r = &pdev->resource[PCI_BRIDGE_RESOURCES + i];
                        if (!r->parent ||
                            !pnv_pci_is_mem_pref_64(r->flags))
                                continue;

                        base = (r->start - phb->ioda.m64_base) / sgsz;
                        for (step = 0; step < resource_size(r) / sgsz; step++)
                                pnv_ioda_reserve_pe(phb, base + step);
                }
        }
}

static int pnv_ioda2_pick_m64_pe(struct pnv_phb *phb,
                                 struct pci_bus *bus, int all)
{
        resource_size_t segsz = phb->ioda.m64_segsize;
        struct pci_dev *pdev;
        struct resource *r;
        struct pnv_ioda_pe *master_pe, *pe;
        unsigned long size, *pe_alloc;
        bool found;
        int start, i, j;

        /* Root bus shouldn't use M64 */
        if (pci_is_root_bus(bus))
                return IODA_INVALID_PE;

        /* We support only one M64 window on each bus */
        found = false;
        pci_bus_for_each_resource(bus, r, i) {
                if (r && r->parent &&
                    pnv_pci_is_mem_pref_64(r->flags)) {
                        found = true;
                        break;
                }
        }

        /* No M64 window found ? */
        if (!found)
                return IODA_INVALID_PE;

        /* Allocate bitmap */
        size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long));
        pe_alloc = kzalloc(size, GFP_KERNEL);
        if (!pe_alloc) {
                pr_warn("%s: Out of memory !\n",
                        __func__);
                return IODA_INVALID_PE;
        }

        /*
         * Figure out reserved PE numbers by the PE
         * the its child PEs.
         */
        start = (r->start - phb->ioda.m64_base) / segsz;
        for (i = 0; i < resource_size(r) / segsz; i++)
                set_bit(start + i, pe_alloc);

        if (all)
                goto done;

        /*
         * If the PE doesn't cover all subordinate buses,
         * we need subtract from reserved PEs for children.
         */
        list_for_each_entry(pdev, &bus->devices, bus_list) {
                if (!pdev->subordinate)
                        continue;

                pci_bus_for_each_resource(pdev->subordinate, r, i) {
                        if (!r || !r->parent ||
                            !pnv_pci_is_mem_pref_64(r->flags))
                                continue;

                        start = (r->start - phb->ioda.m64_base) / segsz;
                        for (j = 0; j < resource_size(r) / segsz ; j++)
                                clear_bit(start + j, pe_alloc);
                }
        }

        /*
         * the current bus might not own M64 window and that's all
         * contributed by its child buses. For the case, we needn't
         * pick M64 dependent PE#.
         */
        if (bitmap_empty(pe_alloc, phb->ioda.total_pe)) {
                kfree(pe_alloc);
                return IODA_INVALID_PE;
        }

        /*
         * Figure out the master PE and put all slave PEs to master
         * PE's list to form compound PE.
         */
done:
        master_pe = NULL;
        i = -1;
        while ((i = find_next_bit(pe_alloc, phb->ioda.total_pe, i + 1)) <
                phb->ioda.total_pe) {
                pe = &phb->ioda.pe_array[i];

                if (!master_pe) {
                        pe->flags |= PNV_IODA_PE_MASTER;
                        INIT_LIST_HEAD(&pe->slaves);
                        master_pe = pe;
                } else {
                        pe->flags |= PNV_IODA_PE_SLAVE;
                        pe->master = master_pe;
                        list_add_tail(&pe->list, &master_pe->slaves);
                }
        }

        kfree(pe_alloc);
        return master_pe->pe_number;
}

static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb)
{
        struct pci_controller *hose = phb->hose;
        struct device_node *dn = hose->dn;
        struct resource *res;
        const u32 *r;
        u64 pci_addr;

        /* FIXME: Support M64 for P7IOC */
        if (phb->type != PNV_PHB_IODA2) {
                pr_info("  Not support M64 window\n");
                return;
        }

        if (!firmware_has_feature(FW_FEATURE_OPALv3)) {
                pr_info("  Firmware too old to support M64 window\n");
                return;
        }

        r = of_get_property(dn, "ibm,opal-m64-window", NULL);
        if (!r) {
                pr_info("  No <ibm,opal-m64-window> on %s\n",
                        dn->full_name);
                return;
        }

        res = &hose->mem_resources[1];
        res->start = of_translate_address(dn, r + 2);
        res->end = res->start + of_read_number(r + 4, 2) - 1;
        res->flags = (IORESOURCE_MEM | IORESOURCE_MEM_64 | IORESOURCE_PREFETCH);
        pci_addr = of_read_number(r, 2);
        hose->mem_offset[1] = res->start - pci_addr;

        phb->ioda.m64_size = resource_size(res);
        phb->ioda.m64_segsize = phb->ioda.m64_size / phb->ioda.total_pe;
        phb->ioda.m64_base = pci_addr;

        /* Use last M64 BAR to cover M64 window */
        phb->ioda.m64_bar_idx = 15;
        phb->init_m64 = pnv_ioda2_init_m64;
        phb->reserve_m64_pe = pnv_ioda2_reserve_m64_pe;
        phb->pick_m64_pe = pnv_ioda2_pick_m64_pe;
}

static void pnv_ioda_freeze_pe(struct pnv_phb *phb, int pe_no)
{
        struct pnv_ioda_pe *pe = &phb->ioda.pe_array[pe_no];
        struct pnv_ioda_pe *slave;
        s64 rc;

        /* Fetch master PE */
        if (pe->flags & PNV_IODA_PE_SLAVE) {
                pe = pe->master;
                if (WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER)))
                        return;

                pe_no = pe->pe_number;
        }

        /* Freeze master PE */
        rc = opal_pci_eeh_freeze_set(phb->opal_id,
                                     pe_no,
                                     OPAL_EEH_ACTION_SET_FREEZE_ALL);
        if (rc != OPAL_SUCCESS) {
                pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n",
                        __func__, rc, phb->hose->global_number, pe_no);
                return;
        }

        /* Freeze slave PEs */
        if (!(pe->flags & PNV_IODA_PE_MASTER))
                return;

        list_for_each_entry(slave, &pe->slaves, list) {
                rc = opal_pci_eeh_freeze_set(phb->opal_id,
                                             slave->pe_number,
                                             OPAL_EEH_ACTION_SET_FREEZE_ALL);
                if (rc != OPAL_SUCCESS)
                        pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n",
                                __func__, rc, phb->hose->global_number,
                                slave->pe_number);
        }
}

static int pnv_ioda_unfreeze_pe(struct pnv_phb *phb, int pe_no, int opt)
{
        struct pnv_ioda_pe *pe, *slave;
        s64 rc;

        /* Find master PE */
        pe = &phb->ioda.pe_array[pe_no];
        if (pe->flags & PNV_IODA_PE_SLAVE) {
                pe = pe->master;
                WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
                pe_no = pe->pe_number;
        }

        /* Clear frozen state for master PE */
        rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no, opt);
        if (rc != OPAL_SUCCESS) {
                pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n",
                        __func__, rc, opt, phb->hose->global_number, pe_no);
                return -EIO;
        }

        if (!(pe->flags & PNV_IODA_PE_MASTER))
                return 0;

        /* Clear frozen state for slave PEs */
        list_for_each_entry(slave, &pe->slaves, list) {
                rc = opal_pci_eeh_freeze_clear(phb->opal_id,
                                             slave->pe_number,
                                             opt);
                if (rc != OPAL_SUCCESS) {
                        pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n",
                                __func__, rc, opt, phb->hose->global_number,
                                slave->pe_number);
                        return -EIO;
                }
        }

        return 0;
}

static int pnv_ioda_get_pe_state(struct pnv_phb *phb, int pe_no)
{
        struct pnv_ioda_pe *slave, *pe;
        u8 fstate, state;
        __be16 pcierr;
        s64 rc;

        /* Sanity check on PE number */
        if (pe_no < 0 || pe_no >= phb->ioda.total_pe)
                return OPAL_EEH_STOPPED_PERM_UNAVAIL;

        /*
         * Fetch the master PE and the PE instance might be
         * not initialized yet.
         */
        pe = &phb->ioda.pe_array[pe_no];
        if (pe->flags & PNV_IODA_PE_SLAVE) {
                pe = pe->master;
                WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
                pe_no = pe->pe_number;
        }

        /* Check the master PE */
        rc = opal_pci_eeh_freeze_status(phb->opal_id, pe_no,
                                        &state, &pcierr, NULL);
        if (rc != OPAL_SUCCESS) {
                pr_warn("%s: Failure %lld getting "
                        "PHB#%x-PE#%x state\n",
                        __func__, rc,
                        phb->hose->global_number, pe_no);
                return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
        }

        /* Check the slave PE */
        if (!(pe->flags & PNV_IODA_PE_MASTER))
                return state;

        list_for_each_entry(slave, &pe->slaves, list) {
                rc = opal_pci_eeh_freeze_status(phb->opal_id,
                                                slave->pe_number,
                                                &fstate,
                                                &pcierr,
                                                NULL);
                if (rc != OPAL_SUCCESS) {
                        pr_warn("%s: Failure %lld getting "
                                "PHB#%x-PE#%x state\n",
                                __func__, rc,
                                phb->hose->global_number, slave->pe_number);
                        return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
                }

                /*
                 * Override the result based on the ascending
                 * priority.
                 */
                if (fstate > state)
                        state = fstate;
        }

        return state;
}

/* Currently those 2 are only used when MSIs are enabled, this will change
 * but in the meantime, we need to protect them to avoid warnings
 */
#ifdef CONFIG_PCI_MSI
static struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        struct pci_dn *pdn = pci_get_pdn(dev);

        if (!pdn)
                return NULL;
        if (pdn->pe_number == IODA_INVALID_PE)
                return NULL;
        return &phb->ioda.pe_array[pdn->pe_number];
}
#endif /* CONFIG_PCI_MSI */

static int pnv_ioda_set_one_peltv(struct pnv_phb *phb,
                                  struct pnv_ioda_pe *parent,
                                  struct pnv_ioda_pe *child,
                                  bool is_add)
{
        const char *desc = is_add ? "adding" : "removing";
        uint8_t op = is_add ? OPAL_ADD_PE_TO_DOMAIN :
                              OPAL_REMOVE_PE_FROM_DOMAIN;
        struct pnv_ioda_pe *slave;
        long rc;

        /* Parent PE affects child PE */
        rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number,
                                child->pe_number, op);
        if (rc != OPAL_SUCCESS) {
                pe_warn(child, "OPAL error %ld %s to parent PELTV\n",
                        rc, desc);
                return -ENXIO;
        }

        if (!(child->flags & PNV_IODA_PE_MASTER))
                return 0;

        /* Compound case: parent PE affects slave PEs */
        list_for_each_entry(slave, &child->slaves, list) {
                rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number,
                                        slave->pe_number, op);
                if (rc != OPAL_SUCCESS) {
                        pe_warn(slave, "OPAL error %ld %s to parent PELTV\n",
                                rc, desc);
                        return -ENXIO;
                }
        }

        return 0;
}

static int pnv_ioda_set_peltv(struct pnv_phb *phb,
                              struct pnv_ioda_pe *pe,
                              bool is_add)
{
        struct pnv_ioda_pe *slave;
        struct pci_dev *pdev;
        int ret;

        /*
         * Clear PE frozen state. If it's master PE, we need
         * clear slave PE frozen state as well.
         */
        if (is_add) {
                opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
                                          OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
                if (pe->flags & PNV_IODA_PE_MASTER) {
                        list_for_each_entry(slave, &pe->slaves, list)
                                opal_pci_eeh_freeze_clear(phb->opal_id,
                                                          slave->pe_number,
                                                          OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
                }
        }

        /*
         * Associate PE in PELT. We need add the PE into the
         * corresponding PELT-V as well. Otherwise, the error
         * originated from the PE might contribute to other
         * PEs.
         */
        ret = pnv_ioda_set_one_peltv(phb, pe, pe, is_add);
        if (ret)
                return ret;

        /* For compound PEs, any one affects all of them */
        if (pe->flags & PNV_IODA_PE_MASTER) {
                list_for_each_entry(slave, &pe->slaves, list) {
                        ret = pnv_ioda_set_one_peltv(phb, slave, pe, is_add);
                        if (ret)
                                return ret;
                }
        }

        if (pe->flags & (PNV_IODA_PE_BUS_ALL | PNV_IODA_PE_BUS))
                pdev = pe->pbus->self;
        else
                pdev = pe->pdev->bus->self;
        while (pdev) {
                struct pci_dn *pdn = pci_get_pdn(pdev);
                struct pnv_ioda_pe *parent;

                if (pdn && pdn->pe_number != IODA_INVALID_PE) {
                        parent = &phb->ioda.pe_array[pdn->pe_number];
                        ret = pnv_ioda_set_one_peltv(phb, parent, pe, is_add);
                        if (ret)
                                return ret;
                }

                pdev = pdev->bus->self;
        }

        return 0;
}

static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
{
        struct pci_dev *parent;
        uint8_t bcomp, dcomp, fcomp;
        long rc, rid_end, rid;

        /* Bus validation ? */
        if (pe->pbus) {
                int count;

                dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER;
                fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER;
                parent = pe->pbus->self;
                if (pe->flags & PNV_IODA_PE_BUS_ALL)
                        count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1;
                else
                        count = 1;

                switch(count) {
                case  1: bcomp = OpalPciBusAll;         break;
                case  2: bcomp = OpalPciBus7Bits;       break;
                case  4: bcomp = OpalPciBus6Bits;       break;
                case  8: bcomp = OpalPciBus5Bits;       break;
                case 16: bcomp = OpalPciBus4Bits;       break;
                case 32: bcomp = OpalPciBus3Bits;       break;
                default:
                        pr_err("%s: Number of subordinate busses %d"
                               " unsupported\n",
                               pci_name(pe->pbus->self), count);
                        /* Do an exact match only */
                        bcomp = OpalPciBusAll;
                }
                rid_end = pe->rid + (count << 8);
        } else {
                parent = pe->pdev->bus->self;
                bcomp = OpalPciBusAll;
                dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
                fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
                rid_end = pe->rid + 1;
        }

        /*
         * Associate PE in PELT. We need add the PE into the
         * corresponding PELT-V as well. Otherwise, the error
         * originated from the PE might contribute to other
         * PEs.
         */
        rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
                             bcomp, dcomp, fcomp, OPAL_MAP_PE);
        if (rc) {
                pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc);
                return -ENXIO;
        }

        /* Configure PELTV */
        pnv_ioda_set_peltv(phb, pe, true);

        /* Setup reverse map */
        for (rid = pe->rid; rid < rid_end; rid++)
                phb->ioda.pe_rmap[rid] = pe->pe_number;

        /* Setup one MVTs on IODA1 */
        if (phb->type != PNV_PHB_IODA1) {
                pe->mve_number = 0;
                goto out;
        }

        pe->mve_number = pe->pe_number;
        rc = opal_pci_set_mve(phb->opal_id, pe->mve_number, pe->pe_number);
        if (rc != OPAL_SUCCESS) {
                pe_err(pe, "OPAL error %ld setting up MVE %d\n",
                       rc, pe->mve_number);
                pe->mve_number = -1;
        } else {
                rc = opal_pci_set_mve_enable(phb->opal_id,
                                             pe->mve_number, OPAL_ENABLE_MVE);
                if (rc) {
                        pe_err(pe, "OPAL error %ld enabling MVE %d\n",
                               rc, pe->mve_number);
                        pe->mve_number = -1;
                }
        }

out:
        return 0;
}

static void pnv_ioda_link_pe_by_weight(struct pnv_phb *phb,
                                       struct pnv_ioda_pe *pe)
{
        struct pnv_ioda_pe *lpe;

        list_for_each_entry(lpe, &phb->ioda.pe_dma_list, dma_link) {
                if (lpe->dma_weight < pe->dma_weight) {
                        list_add_tail(&pe->dma_link, &lpe->dma_link);
                        return;
                }
        }
        list_add_tail(&pe->dma_link, &phb->ioda.pe_dma_list);
}

static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev)
{
        /* This is quite simplistic. The "base" weight of a device
         * is 10. 0 means no DMA is to be accounted for it.
         */

        /* If it's a bridge, no DMA */
        if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
                return 0;

        /* Reduce the weight of slow USB controllers */
        if (dev->class == PCI_CLASS_SERIAL_USB_UHCI ||
            dev->class == PCI_CLASS_SERIAL_USB_OHCI ||
            dev->class == PCI_CLASS_SERIAL_USB_EHCI)
                return 3;

        /* Increase the weight of RAID (includes Obsidian) */
        if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID)
                return 15;

        /* Default */
        return 10;
}

#if 0
static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        struct pci_dn *pdn = pci_get_pdn(dev);
        struct pnv_ioda_pe *pe;
        int pe_num;

        if (!pdn) {
                pr_err("%s: Device tree node not associated properly\n",
                           pci_name(dev));
                return NULL;
        }
        if (pdn->pe_number != IODA_INVALID_PE)
                return NULL;

        /* PE#0 has been pre-set */
        if (dev->bus->number == 0)
                pe_num = 0;
        else
                pe_num = pnv_ioda_alloc_pe(phb);
        if (pe_num == IODA_INVALID_PE) {
                pr_warning("%s: Not enough PE# available, disabling device\n",
                           pci_name(dev));
                return NULL;
        }

        /* NOTE: We get only one ref to the pci_dev for the pdn, not for the
         * pointer in the PE data structure, both should be destroyed at the
         * same time. However, this needs to be looked at more closely again
         * once we actually start removing things (Hotplug, SR-IOV, ...)
         *
         * At some point we want to remove the PDN completely anyways
         */
        pe = &phb->ioda.pe_array[pe_num];
        pci_dev_get(dev);
        pdn->pcidev = dev;
        pdn->pe_number = pe_num;
        pe->pdev = dev;
        pe->pbus = NULL;
        pe->tce32_seg = -1;
        pe->mve_number = -1;
        pe->rid = dev->bus->number << 8 | pdn->devfn;

        pe_info(pe, "Associated device to PE\n");

        if (pnv_ioda_configure_pe(phb, pe)) {
                /* XXX What do we do here ? */
                if (pe_num)
                        pnv_ioda_free_pe(phb, pe_num);
                pdn->pe_number = IODA_INVALID_PE;
                pe->pdev = NULL;
                pci_dev_put(dev);
                return NULL;
        }

        /* Assign a DMA weight to the device */
        pe->dma_weight = pnv_ioda_dma_weight(dev);
        if (pe->dma_weight != 0) {
                phb->ioda.dma_weight += pe->dma_weight;
                phb->ioda.dma_pe_count++;
        }

        /* Link the PE */
        pnv_ioda_link_pe_by_weight(phb, pe);

        return pe;
}
#endif /* Useful for SRIOV case */

static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe)
{
        struct pci_dev *dev;

        list_for_each_entry(dev, &bus->devices, bus_list) {
                struct pci_dn *pdn = pci_get_pdn(dev);

                if (pdn == NULL) {
                        pr_warn("%s: No device node associated with device !\n",
                                pci_name(dev));
                        continue;
                }
                pdn->pcidev = dev;
                pdn->pe_number = pe->pe_number;
                pe->dma_weight += pnv_ioda_dma_weight(dev);
                if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
                        pnv_ioda_setup_same_PE(dev->subordinate, pe);
        }
}

/*
 * There're 2 types of PCI bus sensitive PEs: One that is compromised of
 * single PCI bus. Another one that contains the primary PCI bus and its
 * subordinate PCI devices and buses. The second type of PE is normally
 * orgiriated by PCIe-to-PCI bridge or PLX switch downstream ports.
 */
static void pnv_ioda_setup_bus_PE(struct pci_bus *bus, int all)
{
        struct pci_controller *hose = pci_bus_to_host(bus);
        struct pnv_phb *phb = hose->private_data;
        struct pnv_ioda_pe *pe;
        int pe_num = IODA_INVALID_PE;

        /* Check if PE is determined by M64 */
        if (phb->pick_m64_pe)
                pe_num = phb->pick_m64_pe(phb, bus, all);

        /* The PE number isn't pinned by M64 */
        if (pe_num == IODA_INVALID_PE)
                pe_num = pnv_ioda_alloc_pe(phb);

        if (pe_num == IODA_INVALID_PE) {
                pr_warning("%s: Not enough PE# available for PCI bus %04x:%02x\n",
                        __func__, pci_domain_nr(bus), bus->number);
                return;
        }

        pe = &phb->ioda.pe_array[pe_num];
        pe->flags |= (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS);
        pe->pbus = bus;
        pe->pdev = NULL;
        pe->tce32_seg = -1;
        pe->mve_number = -1;
        pe->rid = bus->busn_res.start << 8;
        pe->dma_weight = 0;

        if (all)
                pe_info(pe, "Secondary bus %d..%d associated with PE#%d\n",
                        bus->busn_res.start, bus->busn_res.end, pe_num);
        else
                pe_info(pe, "Secondary bus %d associated with PE#%d\n",
                        bus->busn_res.start, pe_num);

        if (pnv_ioda_configure_pe(phb, pe)) {
                /* XXX What do we do here ? */
                if (pe_num)
                        pnv_ioda_free_pe(phb, pe_num);
                pe->pbus = NULL;
                return;
        }

        /* Associate it with all child devices */
        pnv_ioda_setup_same_PE(bus, pe);

        /* Put PE to the list */
        list_add_tail(&pe->list, &phb->ioda.pe_list);

        /* Account for one DMA PE if at least one DMA capable device exist
         * below the bridge
         */
        if (pe->dma_weight != 0) {
                phb->ioda.dma_weight += pe->dma_weight;
                phb->ioda.dma_pe_count++;
        }

        /* Link the PE */
        pnv_ioda_link_pe_by_weight(phb, pe);
}

static void pnv_ioda_setup_PEs(struct pci_bus *bus)
{
        struct pci_dev *dev;

        pnv_ioda_setup_bus_PE(bus, 0);

        list_for_each_entry(dev, &bus->devices, bus_list) {
                if (dev->subordinate) {
                        if (pci_pcie_type(dev) == PCI_EXP_TYPE_PCI_BRIDGE)
                                pnv_ioda_setup_bus_PE(dev->subordinate, 1);
                        else
                                pnv_ioda_setup_PEs(dev->subordinate);
                }
        }
}

/*
 * Configure PEs so that the downstream PCI buses and devices
 * could have their associated PE#. Unfortunately, we didn't
 * figure out the way to identify the PLX bridge yet. So we
 * simply put the PCI bus and the subordinate behind the root
 * port to PE# here. The game rule here is expected to be changed
 * as soon as we can detected PLX bridge correctly.
 */
static void pnv_pci_ioda_setup_PEs(void)
{
        struct pci_controller *hose, *tmp;
        struct pnv_phb *phb;

        list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
                phb = hose->private_data;

                /* M64 layout might affect PE allocation */
                if (phb->reserve_m64_pe)
                        phb->reserve_m64_pe(phb);

                pnv_ioda_setup_PEs(hose->bus);
        }
}

static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev)
{
        struct pci_dn *pdn = pci_get_pdn(pdev);
        struct pnv_ioda_pe *pe;

        /*
         * The function can be called while the PE#
         * hasn't been assigned. Do nothing for the
         * case.
         */
        if (!pdn || pdn->pe_number == IODA_INVALID_PE)
                return;

        pe = &phb->ioda.pe_array[pdn->pe_number];
        WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
        set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table);
}

static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb,
                                     struct pci_dev *pdev, u64 dma_mask)
{
        struct pci_dn *pdn = pci_get_pdn(pdev);
        struct pnv_ioda_pe *pe;
        uint64_t top;
        bool bypass = false;

        if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
                return -ENODEV;;

        pe = &phb->ioda.pe_array[pdn->pe_number];
        if (pe->tce_bypass_enabled) {
                top = pe->tce_bypass_base + memblock_end_of_DRAM() - 1;
                bypass = (dma_mask >= top);
        }

        if (bypass) {
                dev_info(&pdev->dev, "Using 64-bit DMA iommu bypass\n");
                set_dma_ops(&pdev->dev, &dma_direct_ops);
                set_dma_offset(&pdev->dev, pe->tce_bypass_base);
        } else {
                dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n");
                set_dma_ops(&pdev->dev, &dma_iommu_ops);
                set_iommu_table_base(&pdev->dev, &pe->tce32_table);
        }
        *pdev->dev.dma_mask = dma_mask;
        return 0;
}

static u64 pnv_pci_ioda_dma_get_required_mask(struct pnv_phb *phb,
                                              struct pci_dev *pdev)
{
        struct pci_dn *pdn = pci_get_pdn(pdev);
        struct pnv_ioda_pe *pe;
        u64 end, mask;

        if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
                return 0;

        pe = &phb->ioda.pe_array[pdn->pe_number];
        if (!pe->tce_bypass_enabled)
                return __dma_get_required_mask(&pdev->dev);


        end = pe->tce_bypass_base + memblock_end_of_DRAM();
        mask = 1ULL << (fls64(end) - 1);
        mask += mask - 1;

        return mask;
}

static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe,
                                   struct pci_bus *bus,
                                   bool add_to_iommu_group)
{
        struct pci_dev *dev;

        list_for_each_entry(dev, &bus->devices, bus_list) {
                if (add_to_iommu_group)
                        set_iommu_table_base_and_group(&dev->dev,
                                                       &pe->tce32_table);
                else
                        set_iommu_table_base(&dev->dev, &pe->tce32_table);

                if (dev->subordinate)
                        pnv_ioda_setup_bus_dma(pe, dev->subordinate,
                                               add_to_iommu_group);
        }
}

static void pnv_pci_ioda1_tce_invalidate(struct pnv_ioda_pe *pe,
                                         struct iommu_table *tbl,
                                         __be64 *startp, __be64 *endp, bool rm)
{
        __be64 __iomem *invalidate = rm ?
                (__be64 __iomem *)pe->tce_inval_reg_phys :
                (__be64 __iomem *)tbl->it_index;
        unsigned long start, end, inc;
        const unsigned shift = tbl->it_page_shift;

        start = __pa(startp);
        end = __pa(endp);

        /* BML uses this case for p6/p7/galaxy2: Shift addr and put in node */
        if (tbl->it_busno) {
                start <<= shift;
                end <<= shift;
                inc = 128ull << shift;
                start |= tbl->it_busno;
                end |= tbl->it_busno;
        } else if (tbl->it_type & TCE_PCI_SWINV_PAIR) {
                /* p7ioc-style invalidation, 2 TCEs per write */
                start |= (1ull << 63);
                end |= (1ull << 63);
                inc = 16;
        } else {
                /* Default (older HW) */
                inc = 128;
        }

        end |= inc - 1; /* round up end to be different than start */

        mb(); /* Ensure above stores are visible */
        while (start <= end) {
                if (rm)
                        __raw_rm_writeq(cpu_to_be64(start), invalidate);
                else
                        __raw_writeq(cpu_to_be64(start), invalidate);
                start += inc;
        }

        /*
         * The iommu layer will do another mb() for us on build()
         * and we don't care on free()
         */
}

static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
                                         struct iommu_table *tbl,
                                         __be64 *startp, __be64 *endp, bool rm)
{
        unsigned long start, end, inc;
        __be64 __iomem *invalidate = rm ?
                (__be64 __iomem *)pe->tce_inval_reg_phys :
                (__be64 __iomem *)tbl->it_index;
        const unsigned shift = tbl->it_page_shift;

        /* We'll invalidate DMA address in PE scope */
        start = 0x2ull << 60;
        start |= (pe->pe_number & 0xFF);
        end = start;

        /* Figure out the start, end and step */
        inc = tbl->it_offset + (((u64)startp - tbl->it_base) / sizeof(u64));
        start |= (inc << shift);
        inc = tbl->it_offset + (((u64)endp - tbl->it_base) / sizeof(u64));
        end |= (inc << shift);
        inc = (0x1ull << shift);
        mb();

        while (start <= end) {
                if (rm)
                        __raw_rm_writeq(cpu_to_be64(start), invalidate);
                else
                        __raw_writeq(cpu_to_be64(start), invalidate);
                start += inc;
        }
}

void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
                                 __be64 *startp, __be64 *endp, bool rm)
{
        struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
                                              tce32_table);
        struct pnv_phb *phb = pe->phb;

        if (phb->type == PNV_PHB_IODA1)
                pnv_pci_ioda1_tce_invalidate(pe, tbl, startp, endp, rm);
        else
                pnv_pci_ioda2_tce_invalidate(pe, tbl, startp, endp, rm);
}

static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
                                      struct pnv_ioda_pe *pe, unsigned int base,
                                      unsigned int segs)
{

        struct page *tce_mem = NULL;
        const __be64 *swinvp;
        struct iommu_table *tbl;
        unsigned int i;
        int64_t rc;
        void *addr;

        /* 256M DMA window, 4K TCE pages, 8 bytes TCE */
#define TCE32_TABLE_SIZE        ((0x10000000 / 0x1000) * 8)

        /* XXX FIXME: Handle 64-bit only DMA devices */
        /* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */
        /* XXX FIXME: Allocate multi-level tables on PHB3 */

        /* We shouldn't already have a 32-bit DMA associated */
        if (WARN_ON(pe->tce32_seg >= 0))
                return;

        /* Grab a 32-bit TCE table */
        pe->tce32_seg = base;
        pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
                (base << 28), ((base + segs) << 28) - 1);

        /* XXX Currently, we allocate one big contiguous table for the
         * TCEs. We only really need one chunk per 256M of TCE space
         * (ie per segment) but that's an optimization for later, it
         * requires some added smarts with our get/put_tce implementation
         */
        tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
                                   get_order(TCE32_TABLE_SIZE * segs));
        if (!tce_mem) {
                pe_err(pe, " Failed to allocate a 32-bit TCE memory\n");
                goto fail;
        }
        addr = page_address(tce_mem);
        memset(addr, 0, TCE32_TABLE_SIZE * segs);

        /* Configure HW */
        for (i = 0; i < segs; i++) {
                rc = opal_pci_map_pe_dma_window(phb->opal_id,
                                              pe->pe_number,
                                              base + i, 1,
                                              __pa(addr) + TCE32_TABLE_SIZE * i,
                                              TCE32_TABLE_SIZE, 0x1000);
                if (rc) {
                        pe_err(pe, " Failed to configure 32-bit TCE table,"
                               " err %ld\n", rc);
                        goto fail;
                }
        }

        /* Setup linux iommu table */
        tbl = &pe->tce32_table;
        pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
                                  base << 28, IOMMU_PAGE_SHIFT_4K);

        /* OPAL variant of P7IOC SW invalidated TCEs */
        swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
        if (swinvp) {
                /* We need a couple more fields -- an address and a data
                 * to or.  Since the bus is only printed out on table free
                 * errors, and on the first pass the data will be a relative
                 * bus number, print that out instead.
                 */
                pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
                tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
                                8);
                tbl->it_type |= (TCE_PCI_SWINV_CREATE |
                                 TCE_PCI_SWINV_FREE   |
                                 TCE_PCI_SWINV_PAIR);
        }
        iommu_init_table(tbl, phb->hose->node);
        iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);

        if (pe->pdev)
                set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
        else
                pnv_ioda_setup_bus_dma(pe, pe->pbus, true);

        return;
 fail:
        /* XXX Failure: Try to fallback to 64-bit only ? */
        if (pe->tce32_seg >= 0)
                pe->tce32_seg = -1;
        if (tce_mem)
                __free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs));
}

static void pnv_pci_ioda2_set_bypass(struct iommu_table *tbl, bool enable)
{
        struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
                                              tce32_table);
        uint16_t window_id = (pe->pe_number << 1 ) + 1;
        int64_t rc;

        pe_info(pe, "%sabling 64-bit DMA bypass\n", enable ? "En" : "Dis");
        if (enable) {
                phys_addr_t top = memblock_end_of_DRAM();

                top = roundup_pow_of_two(top);
                rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
                                                     pe->pe_number,
                                                     window_id,
                                                     pe->tce_bypass_base,
                                                     top);
        } else {
                rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
                                                     pe->pe_number,
                                                     window_id,
                                                     pe->tce_bypass_base,
                                                     0);

                /*
                 * EEH needs the mapping between IOMMU table and group
                 * of those VFIO/KVM pass-through devices. We can postpone
                 * resetting DMA ops until the DMA mask is configured in
                 * host side.
                 */
                if (pe->pdev)
                        set_iommu_table_base(&pe->pdev->dev, tbl);
                else
                        pnv_ioda_setup_bus_dma(pe, pe->pbus, false);
        }
        if (rc)
                pe_err(pe, "OPAL error %lld configuring bypass window\n", rc);
        else
                pe->tce_bypass_enabled = enable;
}

static void pnv_pci_ioda2_setup_bypass_pe(struct pnv_phb *phb,
                                          struct pnv_ioda_pe *pe)
{
        /* TVE #1 is selected by PCI address bit 59 */
        pe->tce_bypass_base = 1ull << 59;

        /* Install set_bypass callback for VFIO */
        pe->tce32_table.set_bypass = pnv_pci_ioda2_set_bypass;

        /* Enable bypass by default */
        pnv_pci_ioda2_set_bypass(&pe->tce32_table, true);
}

static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
                                       struct pnv_ioda_pe *pe)
{
        struct page *tce_mem = NULL;
        void *addr;
        const __be64 *swinvp;
        struct iommu_table *tbl;
        unsigned int tce_table_size, end;
        int64_t rc;

        /* We shouldn't already have a 32-bit DMA associated */
        if (WARN_ON(pe->tce32_seg >= 0))
                return;

        /* The PE will reserve all possible 32-bits space */
        pe->tce32_seg = 0;
        end = (1 << ilog2(phb->ioda.m32_pci_base));
        tce_table_size = (end / 0x1000) * 8;
        pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n",
                end);

        /* Allocate TCE table */
        tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
                                   get_order(tce_table_size));
        if (!tce_mem) {
                pe_err(pe, "Failed to allocate a 32-bit TCE memory\n");
                goto fail;
        }
        addr = page_address(tce_mem);
        memset(addr, 0, tce_table_size);

        /*
         * Map TCE table through TVT. The TVE index is the PE number
         * shifted by 1 bit for 32-bits DMA space.
         */
        rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
                                        pe->pe_number << 1, 1, __pa(addr),
                                        tce_table_size, 0x1000);
        if (rc) {
                pe_err(pe, "Failed to configure 32-bit TCE table,"
                       " err %ld\n", rc);
                goto fail;
        }

        /* Setup linux iommu table */
        tbl = &pe->tce32_table;
        pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0,
                        IOMMU_PAGE_SHIFT_4K);

        /* OPAL variant of PHB3 invalidated TCEs */
        swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
        if (swinvp) {
                /* We need a couple more fields -- an address and a data
                 * to or.  Since the bus is only printed out on table free
                 * errors, and on the first pass the data will be a relative
                 * bus number, print that out instead.
                 */
                pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
                tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
                                8);
                tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);
        }
        iommu_init_table(tbl, phb->hose->node);
        iommu_register_group(tbl, phb->hose->global_number, pe->pe_number);

        if (pe->pdev)
                set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
        else
                pnv_ioda_setup_bus_dma(pe, pe->pbus, true);

        /* Also create a bypass window */
        pnv_pci_ioda2_setup_bypass_pe(phb, pe);
        return;
fail:
        if (pe->tce32_seg >= 0)
                pe->tce32_seg = -1;
        if (tce_mem)
                __free_pages(tce_mem, get_order(tce_table_size));
}

static void pnv_ioda_setup_dma(struct pnv_phb *phb)
{
        struct pci_controller *hose = phb->hose;
        unsigned int residual, remaining, segs, tw, base;
        struct pnv_ioda_pe *pe;

        /* If we have more PE# than segments available, hand out one
         * per PE until we run out and let the rest fail. If not,
         * then we assign at least one segment per PE, plus more based
         * on the amount of devices under that PE
         */
        if (phb->ioda.dma_pe_count > phb->ioda.tce32_count)
                residual = 0;
        else
                residual = phb->ioda.tce32_count -
                        phb->ioda.dma_pe_count;

        pr_info("PCI: Domain %04x has %ld available 32-bit DMA segments\n",
                hose->global_number, phb->ioda.tce32_count);
        pr_info("PCI: %d PE# for a total weight of %d\n",
                phb->ioda.dma_pe_count, phb->ioda.dma_weight);

        /* Walk our PE list and configure their DMA segments, hand them
         * out one base segment plus any residual segments based on
         * weight
         */
        remaining = phb->ioda.tce32_count;
        tw = phb->ioda.dma_weight;
        base = 0;
        list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
                if (!pe->dma_weight)
                        continue;
                if (!remaining) {
                        pe_warn(pe, "No DMA32 resources available\n");
                        continue;
                }
                segs = 1;
                if (residual) {
                        segs += ((pe->dma_weight * residual)  + (tw / 2)) / tw;
                        if (segs > remaining)
                                segs = remaining;
                }

                /*
                 * For IODA2 compliant PHB3, we needn't care about the weight.
                 * The all available 32-bits DMA space will be assigned to
                 * the specific PE.
                 */
                if (phb->type == PNV_PHB_IODA1) {
                        pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n",
                                pe->dma_weight, segs);
                        pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
                } else {
                        pe_info(pe, "Assign DMA32 space\n");
                        segs = 0;
                        pnv_pci_ioda2_setup_dma_pe(phb, pe);
                }

                remaining -= segs;
                base += segs;
        }
}

#ifdef CONFIG_PCI_MSI
static void pnv_ioda2_msi_eoi(struct irq_data *d)
{
        unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
        struct irq_chip *chip = irq_data_get_irq_chip(d);
        struct pnv_phb *phb = container_of(chip, struct pnv_phb,
                                           ioda.irq_chip);
        int64_t rc;

        rc = opal_pci_msi_eoi(phb->opal_id, hw_irq);
        WARN_ON_ONCE(rc);

        icp_native_eoi(d);
}


static void set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq)
{
        struct irq_data *idata;
        struct irq_chip *ichip;

        if (phb->type != PNV_PHB_IODA2)
                return;

        if (!phb->ioda.irq_chip_init) {
                /*
                 * First time we setup an MSI IRQ, we need to setup the
                 * corresponding IRQ chip to route correctly.
                 */
                idata = irq_get_irq_data(virq);
                ichip = irq_data_get_irq_chip(idata);
                phb->ioda.irq_chip_init = 1;
                phb->ioda.irq_chip = *ichip;
                phb->ioda.irq_chip.irq_eoi = pnv_ioda2_msi_eoi;
        }
        irq_set_chip(virq, &phb->ioda.irq_chip);
}

#ifdef CONFIG_CXL_BASE

struct device_node *pnv_pci_to_phb_node(struct pci_dev *dev)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);

        return hose->dn;
}
EXPORT_SYMBOL(pnv_pci_to_phb_node);

int pnv_phb_to_cxl(struct pci_dev *dev)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        struct pnv_ioda_pe *pe;
        int rc;

        pe = pnv_ioda_get_pe(dev);
        if (!pe)
                return -ENODEV;

        pe_info(pe, "Switching PHB to CXL\n");

        rc = opal_pci_set_phb_cxl_mode(phb->opal_id, 1, pe->pe_number);
        if (rc)
                dev_err(&dev->dev, "opal_pci_set_phb_cxl_mode failed: %i\n", rc);

        return rc;
}
EXPORT_SYMBOL(pnv_phb_to_cxl);

/* Find PHB for cxl dev and allocate MSI hwirqs?
 * Returns the absolute hardware IRQ number
 */
int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        int hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, num);

        if (hwirq < 0) {
                dev_warn(&dev->dev, "Failed to find a free MSI\n");
                return -ENOSPC;
        }

        return phb->msi_base + hwirq;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirqs);

void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;

        msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq - phb->msi_base, num);
}
EXPORT_SYMBOL(pnv_cxl_release_hwirqs);

void pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges *irqs,
                                  struct pci_dev *dev)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        int i, hwirq;

        for (i = 1; i < CXL_IRQ_RANGES; i++) {
                if (!irqs->range[i])
                        continue;
                pr_devel("cxl release irq range 0x%x: offset: 0x%lx  limit: %ld\n",
                         i, irqs->offset[i],
                         irqs->range[i]);
                hwirq = irqs->offset[i] - phb->msi_base;
                msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
                                       irqs->range[i]);
        }
}
EXPORT_SYMBOL(pnv_cxl_release_hwirq_ranges);

int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs,
                               struct pci_dev *dev, int num)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        int i, hwirq, try;

        memset(irqs, 0, sizeof(struct cxl_irq_ranges));

        /* 0 is reserved for the multiplexed PSL DSI interrupt */
        for (i = 1; i < CXL_IRQ_RANGES && num; i++) {
                try = num;
                while (try) {
                        hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, try);
                        if (hwirq >= 0)
                                break;
                        try /= 2;
                }
                if (!try)
                        goto fail;

                irqs->offset[i] = phb->msi_base + hwirq;
                irqs->range[i] = try;
                pr_devel("cxl alloc irq range 0x%x: offset: 0x%lx  limit: %li\n",
                         i, irqs->offset[i], irqs->range[i]);
                num -= try;
        }
        if (num)
                goto fail;

        return 0;
fail:
        pnv_cxl_release_hwirq_ranges(irqs, dev);
        return -ENOSPC;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirq_ranges);

int pnv_cxl_get_irq_count(struct pci_dev *dev)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;

        return phb->msi_bmp.irq_count;
}
EXPORT_SYMBOL(pnv_cxl_get_irq_count);

int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
                           unsigned int virq)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        unsigned int xive_num = hwirq - phb->msi_base;
        struct pnv_ioda_pe *pe;
        int rc;

        if (!(pe = pnv_ioda_get_pe(dev)))
                return -ENODEV;

        /* Assign XIVE to PE */
        rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
        if (rc) {
                pe_warn(pe, "%s: OPAL error %d setting msi_base 0x%x "
                        "hwirq 0x%x XIVE 0x%x PE\n",
                        pci_name(dev), rc, phb->msi_base, hwirq, xive_num);
                return -EIO;
        }
        set_msi_irq_chip(phb, virq);

        return 0;
}
EXPORT_SYMBOL(pnv_cxl_ioda_msi_setup);
#endif

static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
                                  unsigned int hwirq, unsigned int virq,
                                  unsigned int is_64, struct msi_msg *msg)
{
        struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
        struct pci_dn *pdn = pci_get_pdn(dev);
        unsigned int xive_num = hwirq - phb->msi_base;
        __be32 data;
        int rc;

        /* No PE assigned ? bail out ... no MSI for you ! */
        if (pe == NULL)
                return -ENXIO;

        /* Check if we have an MVE */
        if (pe->mve_number < 0)
                return -ENXIO;

        /* Force 32-bit MSI on some broken devices */
        if (pdn && pdn->force_32bit_msi)
                is_64 = 0;

        /* Assign XIVE to PE */
        rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
        if (rc) {
                pr_warn("%s: OPAL error %d setting XIVE %d PE\n",
                        pci_name(dev), rc, xive_num);
                return -EIO;
        }

        if (is_64) {
                __be64 addr64;

                rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1,
                                     &addr64, &data);
                if (rc) {
                        pr_warn("%s: OPAL error %d getting 64-bit MSI data\n",
                                pci_name(dev), rc);
                        return -EIO;
                }
                msg->address_hi = be64_to_cpu(addr64) >> 32;
                msg->address_lo = be64_to_cpu(addr64) & 0xfffffffful;
        } else {
                __be32 addr32;

                rc = opal_get_msi_32(phb->opal_id, pe->mve_number, xive_num, 1,
                                     &addr32, &data);
                if (rc) {
                        pr_warn("%s: OPAL error %d getting 32-bit MSI data\n",
                                pci_name(dev), rc);
                        return -EIO;
                }
                msg->address_hi = 0;
                msg->address_lo = be32_to_cpu(addr32);
        }
        msg->data = be32_to_cpu(data);

        set_msi_irq_chip(phb, virq);

        pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d),"
                 " address=%x_%08x data=%x PE# %d\n",
                 pci_name(dev), is_64 ? "64" : "32", hwirq, xive_num,
                 msg->address_hi, msg->address_lo, data, pe->pe_number);

        return 0;
}

static void pnv_pci_init_ioda_msis(struct pnv_phb *phb)
{
        unsigned int count;
        const __be32 *prop = of_get_property(phb->hose->dn,
                                             "ibm,opal-msi-ranges", NULL);
        if (!prop) {
                /* BML Fallback */
                prop = of_get_property(phb->hose->dn, "msi-ranges", NULL);
        }
        if (!prop)
                return;

        phb->msi_base = be32_to_cpup(prop);
        count = be32_to_cpup(prop + 1);
        if (msi_bitmap_alloc(&phb->msi_bmp, count, phb->hose->dn)) {
                pr_err("PCI %d: Failed to allocate MSI bitmap !\n",
                       phb->hose->global_number);
                return;
        }

        phb->msi_setup = pnv_pci_ioda_msi_setup;
        phb->msi32_support = 1;
        pr_info("  Allocated bitmap for %d MSIs (base IRQ 0x%x)\n",
                count, phb->msi_base);
}
#else
static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { }
#endif /* CONFIG_PCI_MSI */

/*
 * This function is supposed to be called on basis of PE from top
 * to bottom style. So the the I/O or MMIO segment assigned to
 * parent PE could be overrided by its child PEs if necessary.
 */
static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
                                  struct pnv_ioda_pe *pe)
{
        struct pnv_phb *phb = hose->private_data;
        struct pci_bus_region region;
        struct resource *res;
        int i, index;
        int rc;

        /*
         * NOTE: We only care PCI bus based PE for now. For PCI
         * device based PE, for example SRIOV sensitive VF should
         * be figured out later.
         */
        BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)));

        pci_bus_for_each_resource(pe->pbus, res, i) {
                if (!res || !res->flags ||
                    res->start > res->end)
                        continue;

                if (res->flags & IORESOURCE_IO) {
                        region.start = res->start - phb->ioda.io_pci_base;
                        region.end   = res->end - phb->ioda.io_pci_base;
                        index = region.start / phb->ioda.io_segsize;

                        while (index < phb->ioda.total_pe &&
                               region.start <= region.end) {
                                phb->ioda.io_segmap[index] = pe->pe_number;
                                rc = opal_pci_map_pe_mmio_window(phb->opal_id,
                                        pe->pe_number, OPAL_IO_WINDOW_TYPE, 0, index);
                                if (rc != OPAL_SUCCESS) {
                                        pr_err("%s: OPAL error %d when mapping IO "
                                               "segment #%d to PE#%d\n",
                                               __func__, rc, index, pe->pe_number);
                                        break;
                                }

                                region.start += phb->ioda.io_segsize;
                                index++;
                        }
                } else if (res->flags & IORESOURCE_MEM) {
                        region.start = res->start -
                                       hose->mem_offset[0] -
                                       phb->ioda.m32_pci_base;
                        region.end   = res->end -
                                       hose->mem_offset[0] -
                                       phb->ioda.m32_pci_base;
                        index = region.start / phb->ioda.m32_segsize;

                        while (index < phb->ioda.total_pe &&
                               region.start <= region.end) {
                                phb->ioda.m32_segmap[index] = pe->pe_number;
                                rc = opal_pci_map_pe_mmio_window(phb->opal_id,
                                        pe->pe_number, OPAL_M32_WINDOW_TYPE, 0, index);
                                if (rc != OPAL_SUCCESS) {
                                        pr_err("%s: OPAL error %d when mapping M32 "
                                               "segment#%d to PE#%d",
                                               __func__, rc, index, pe->pe_number);
                                        break;
                                }

                                region.start += phb->ioda.m32_segsize;
                                index++;
                        }
                }
        }
}

static void pnv_pci_ioda_setup_seg(void)
{
        struct pci_controller *tmp, *hose;
        struct pnv_phb *phb;
        struct pnv_ioda_pe *pe;

        list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
                phb = hose->private_data;
                list_for_each_entry(pe, &phb->ioda.pe_list, list) {
                        pnv_ioda_setup_pe_seg(hose, pe);
                }
        }
}

static void pnv_pci_ioda_setup_DMA(void)
{
        struct pci_controller *hose, *tmp;
        struct pnv_phb *phb;

        list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
                pnv_ioda_setup_dma(hose->private_data);

                /* Mark the PHB initialization done */
                phb = hose->private_data;
                phb->initialized = 1;
        }
}

static void pnv_pci_ioda_create_dbgfs(void)
{
#ifdef CONFIG_DEBUG_FS
        struct pci_controller *hose, *tmp;
        struct pnv_phb *phb;
        char name[16];

        list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
                phb = hose->private_data;

                sprintf(name, "PCI%04x", hose->global_number);
                phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root);
                if (!phb->dbgfs)
                        pr_warning("%s: Error on creating debugfs on PHB#%x\n",
                                __func__, hose->global_number);
        }
#endif /* CONFIG_DEBUG_FS */
}

static void pnv_pci_ioda_fixup(void)
{
        pnv_pci_ioda_setup_PEs();
        pnv_pci_ioda_setup_seg();
        pnv_pci_ioda_setup_DMA();

        pnv_pci_ioda_create_dbgfs();

#ifdef CONFIG_EEH
        eeh_init();
        eeh_addr_cache_build();
#endif
}

/*
 * Returns the alignment for I/O or memory windows for P2P
 * bridges. That actually depends on how PEs are segmented.
 * For now, we return I/O or M32 segment size for PE sensitive
 * P2P bridges. Otherwise, the default values (4KiB for I/O,
 * 1MiB for memory) will be returned.
 *
 * The current PCI bus might be put into one PE, which was
 * create against the parent PCI bridge. For that case, we
 * needn't enlarge the alignment so that we can save some
 * resources.
 */
static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
                                                unsigned long type)
{
        struct pci_dev *bridge;
        struct pci_controller *hose = pci_bus_to_host(bus);
        struct pnv_phb *phb = hose->private_data;
        int num_pci_bridges = 0;

        bridge = bus->self;
        while (bridge) {
                if (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE) {
                        num_pci_bridges++;
                        if (num_pci_bridges >= 2)
                                return 1;
                }

                bridge = bridge->bus->self;
        }

        /* We fail back to M32 if M64 isn't supported */
        if (phb->ioda.m64_segsize &&
            pnv_pci_is_mem_pref_64(type))
                return phb->ioda.m64_segsize;
        if (type & IORESOURCE_MEM)
                return phb->ioda.m32_segsize;

        return phb->ioda.io_segsize;
}

/* Prevent enabling devices for which we couldn't properly
 * assign a PE
 */
static int pnv_pci_enable_device_hook(struct pci_dev *dev)
{
        struct pci_controller *hose = pci_bus_to_host(dev->bus);
        struct pnv_phb *phb = hose->private_data;
        struct pci_dn *pdn;

        /* The function is probably called while the PEs have
         * not be created yet. For example, resource reassignment
         * during PCI probe period. We just skip the check if
         * PEs isn't ready.
         */
        if (!phb->initialized)
                return 0;

        pdn = pci_get_pdn(dev);
        if (!pdn || pdn->pe_number == IODA_INVALID_PE)
                return -EINVAL;

        return 0;
}

static u32 pnv_ioda_bdfn_to_pe(struct pnv_phb *phb, struct pci_bus *bus,
                               u32 devfn)
{
        return phb->ioda.pe_rmap[(bus->number << 8) | devfn];
}

static void pnv_pci_ioda_shutdown(struct pnv_phb *phb)
{
        opal_pci_reset(phb->opal_id, OPAL_RESET_PCI_IODA_TABLE,
                       OPAL_ASSERT_RESET);
}

static void __init pnv_pci_init_ioda_phb(struct device_node *np,
                                         u64 hub_id, int ioda_type)
{
        struct pci_controller *hose;
        struct pnv_phb *phb;
        unsigned long size, m32map_off, pemap_off, iomap_off = 0;
        const __be64 *prop64;
        const __be32 *prop32;
        int len;
        u64 phb_id;
        void *aux;
        long rc;

        pr_info("Initializing IODA%d OPAL PHB %s\n", ioda_type, np->full_name);

        prop64 = of_get_property(np, "ibm,opal-phbid", NULL);
        if (!prop64) {
                pr_err("  Missing \"ibm,opal-phbid\" property !\n");
                return;
        }
        phb_id = be64_to_cpup(prop64);
        pr_debug("  PHB-ID  : 0x%016llx\n", phb_id);

        phb = alloc_bootmem(sizeof(struct pnv_phb));
        if (!phb) {
                pr_err("  Out of memory !\n");
                return;
        }

        /* Allocate PCI controller */
        memset(phb, 0, sizeof(struct pnv_phb));
        phb->hose = hose = pcibios_alloc_controller(np);
        if (!phb->hose) {
                pr_err("  Can't allocate PCI controller for %s\n",
                       np->full_name);
                free_bootmem((unsigned long)phb, sizeof(struct pnv_phb));
                return;
        }

        spin_lock_init(&phb->lock);
        prop32 = of_get_property(np, "bus-range", &len);
        if (prop32 && len == 8) {
                hose->first_busno = be32_to_cpu(prop32[0]);
                hose->last_busno = be32_to_cpu(prop32[1]);
        } else {
                pr_warn("  Broken <bus-range> on %s\n", np->full_name);
                hose->first_busno = 0;
                hose->last_busno = 0xff;
        }
        hose->private_data = phb;
        phb->hub_id = hub_id;
        phb->opal_id = phb_id;
        phb->type = ioda_type;

        /* Detect specific models for error handling */
        if (of_device_is_compatible(np, "ibm,p7ioc-pciex"))
                phb->model = PNV_PHB_MODEL_P7IOC;
        else if (of_device_is_compatible(np, "ibm,power8-pciex"))
                phb->model = PNV_PHB_MODEL_PHB3;
        else
                phb->model = PNV_PHB_MODEL_UNKNOWN;

        /* Parse 32-bit and IO ranges (if any) */
        pci_process_bridge_OF_ranges(hose, np, !hose->global_number);

        /* Get registers */
        phb->regs = of_iomap(np, 0);
        if (phb->regs == NULL)
                pr_err("  Failed to map registers !\n");

        /* Initialize more IODA stuff */
        phb->ioda.total_pe = 1;
        prop32 = of_get_property(np, "ibm,opal-num-pes", NULL);
        if (prop32)
                phb->ioda.total_pe = be32_to_cpup(prop32);
        prop32 = of_get_property(np, "ibm,opal-reserved-pe", NULL);
        if (prop32)
                phb->ioda.reserved_pe = be32_to_cpup(prop32);

        /* Parse 64-bit MMIO range */
        pnv_ioda_parse_m64_window(phb);

        phb->ioda.m32_size = resource_size(&hose->mem_resources[0]);
        /* FW Has already off top 64k of M32 space (MSI space) */
        phb->ioda.m32_size += 0x10000;

        phb->ioda.m32_segsize = phb->ioda.m32_size / phb->ioda.total_pe;
        phb->ioda.m32_pci_base = hose->mem_resources[0].start - hose->mem_offset[0];
        phb->ioda.io_size = hose->pci_io_size;
        phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe;
        phb->ioda.io_pci_base = 0; /* XXX calculate this ? */

        /* Allocate aux data & arrays. We don't have IO ports on PHB3 */
        size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long));
        m32map_off = size;
        size += phb->ioda.total_pe * sizeof(phb->ioda.m32_segmap[0]);
        if (phb->type == PNV_PHB_IODA1) {
                iomap_off = size;
                size += phb->ioda.total_pe * sizeof(phb->ioda.io_segmap[0]);
        }
        pemap_off = size;
        size += phb->ioda.total_pe * sizeof(struct pnv_ioda_pe);
        aux = alloc_bootmem(size);
        memset(aux, 0, size);
        phb->ioda.pe_alloc = aux;
        phb->ioda.m32_segmap = aux + m32map_off;
        if (phb->type == PNV_PHB_IODA1)
                phb->ioda.io_segmap = aux + iomap_off;
        phb->ioda.pe_array = aux + pemap_off;
        set_bit(phb->ioda.reserved_pe, phb->ioda.pe_alloc);

        INIT_LIST_HEAD(&phb->ioda.pe_dma_list);
        INIT_LIST_HEAD(&phb->ioda.pe_list);

        /* Calculate how many 32-bit TCE segments we have */
        phb->ioda.tce32_count = phb->ioda.m32_pci_base >> 28;

#if 0 /* We should really do that ... */
        rc = opal_pci_set_phb_mem_window(opal->phb_id,
                                         window_type,
                                         window_num,
                                         starting_real_address,
                                         starting_pci_address,
                                         segment_size);
#endif

        pr_info("  %03d (%03d) PE's M32: 0x%x [segment=0x%x]\n",
                phb->ioda.total_pe, phb->ioda.reserved_pe,
                phb->ioda.m32_size, phb->ioda.m32_segsize);
        if (phb->ioda.m64_size)
                pr_info("                 M64: 0x%lx [segment=0x%lx]\n",
                        phb->ioda.m64_size, phb->ioda.m64_segsize);
        if (phb->ioda.io_size)
                pr_info("                  IO: 0x%x [segment=0x%x]\n",
                        phb->ioda.io_size, phb->ioda.io_segsize);


        phb->hose->ops = &pnv_pci_ops;
        phb->get_pe_state = pnv_ioda_get_pe_state;
        phb->freeze_pe = pnv_ioda_freeze_pe;
        phb->unfreeze_pe = pnv_ioda_unfreeze_pe;
#ifdef CONFIG_EEH
        phb->eeh_ops = &ioda_eeh_ops;
#endif

        /* Setup RID -> PE mapping function */
        phb->bdfn_to_pe = pnv_ioda_bdfn_to_pe;

        /* Setup TCEs */
        phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;
        phb->dma_set_mask = pnv_pci_ioda_dma_set_mask;
        phb->dma_get_required_mask = pnv_pci_ioda_dma_get_required_mask;

        /* Setup shutdown function for kexec */
        phb->shutdown = pnv_pci_ioda_shutdown;

        /* Setup MSI support */
        pnv_pci_init_ioda_msis(phb);

        /*
         * We pass the PCI probe flag PCI_REASSIGN_ALL_RSRC here
         * to let the PCI core do resource assignment. It's supposed
         * that the PCI core will do correct I/O and MMIO alignment
         * for the P2P bridge bars so that each PCI bus (excluding
         * the child P2P bridges) can form individual PE.
         */
        ppc_md.pcibios_fixup = pnv_pci_ioda_fixup;
        ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook;
        ppc_md.pcibios_window_alignment = pnv_pci_window_alignment;
        ppc_md.pcibios_reset_secondary_bus = pnv_pci_reset_secondary_bus;
        pci_add_flags(PCI_REASSIGN_ALL_RSRC);

        /* Reset IODA tables to a clean state */
        rc = opal_pci_reset(phb_id, OPAL_RESET_PCI_IODA_TABLE, OPAL_ASSERT_RESET);
        if (rc)
                pr_warning("  OPAL Error %ld performing IODA table reset !\n", rc);

        /* If we're running in kdump kerenl, the previous kerenl never
         * shutdown PCI devices correctly. We already got IODA table
         * cleaned out. So we have to issue PHB reset to stop all PCI
         * transactions from previous kerenl.
         */
        if (is_kdump_kernel()) {
                pr_info("  Issue PHB reset ...\n");
                ioda_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL);
                ioda_eeh_phb_reset(hose, OPAL_DEASSERT_RESET);
        }

        /* Remove M64 resource if we can't configure it successfully */
        if (!phb->init_m64 || phb->init_m64(phb))
                hose->mem_resources[1].flags = 0;
}

void __init pnv_pci_init_ioda2_phb(struct device_node *np)
{
        pnv_pci_init_ioda_phb(np, 0, PNV_PHB_IODA2);
}

void __init pnv_pci_init_ioda_hub(struct device_node *np)
{
        struct device_node *phbn;
        const __be64 *prop64;
        u64 hub_id;

        pr_info("Probing IODA IO-Hub %s\n", np->full_name);

        prop64 = of_get_property(np, "ibm,opal-hubid", NULL);
        if (!prop64) {
                pr_err(" Missing \"ibm,opal-hubid\" property !\n");
                return;
        }
        hub_id = be64_to_cpup(prop64);
        pr_devel(" HUB-ID : 0x%016llx\n", hub_id);

        /* Count child PHBs */
        for_each_child_of_node(np, phbn) {
                /* Look for IODA1 PHBs */
                if (of_device_is_compatible(phbn, "ibm,ioda-phb"))
                        pnv_pci_init_ioda_phb(phbn, hub_id, PNV_PHB_IODA1);
        }
}