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 <linux/iommu.h>
#include <linux/rculist.h>
#include <linux/sizes.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 <asm/mmzone.h>

#include <misc/cxl-base.h>

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

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

#define POWERNV_IOMMU_DEFAULT_LEVELS	1
#define POWERNV_IOMMU_MAX_LEVELS	5

static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl);

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->flags & PNV_IODA_PE_DEV)
		strlcpy(pfix, dev_name(&pe->pdev->dev), sizeof(pfix));
	else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
		sprintf(pfix, "%04x:%02x     ",
			pci_domain_nr(pe->pbus), pe->pbus->number);
#ifdef CONFIG_PCI_IOV
	else if (pe->flags & PNV_IODA_PE_VF)
		sprintf(pfix, "%04x:%02x:%2x.%d",
			pci_domain_nr(pe->parent_dev->bus),
			(pe->rid & 0xff00) >> 8,
			PCI_SLOT(pe->rid), PCI_FUNC(pe->rid));
#endif /* CONFIG_PCI_IOV*/

	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__)

static bool pnv_iommu_bypass_disabled __read_mostly;

static int __init iommu_setup(char *str)
{
	if (!str)
		return -EINVAL;

	while (*str) {
		if (!strncmp(str, "nobypass", 8)) {
			pnv_iommu_bypass_disabled = true;
			pr_info("PowerNV: IOMMU bypass window disabled.\n");
			break;
		}
		str += strcspn(str, ",");
		if (*str == ',')
			str++;
	}

	return 0;
}
early_param("iommu", iommu_setup);

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_debug("%s: PE %d was reserved on PHB#%x\n",
			 __func__, pe_no, phb->hose->global_number);

	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_dev_m64_pe(struct pci_dev *pdev,
					 unsigned long *pe_bitmap)
{
	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
	struct pnv_phb *phb = hose->private_data;
	struct resource *r;
	resource_size_t base, sgsz, start, end;
	int segno, i;

	base = phb->ioda.m64_base;
	sgsz = phb->ioda.m64_segsize;
	for (i = 0; i <= PCI_ROM_RESOURCE; i++) {
		r = &pdev->resource[i];
		if (!r->parent || !pnv_pci_is_mem_pref_64(r->flags))
			continue;

		start = _ALIGN_DOWN(r->start - base, sgsz);
		end = _ALIGN_UP(r->end - base, sgsz);
		for (segno = start / sgsz; segno < end / sgsz; segno++) {
			if (pe_bitmap)
				set_bit(segno, pe_bitmap);
			else
				pnv_ioda_reserve_pe(phb, segno);
		}
	}
}

static void pnv_ioda2_reserve_m64_pe(struct pci_bus *bus,
				     unsigned long *pe_bitmap,
				     bool all)
{
	struct pci_dev *pdev;

	list_for_each_entry(pdev, &bus->devices, bus_list) {
		pnv_ioda2_reserve_dev_m64_pe(pdev, pe_bitmap);

		if (all && pdev->subordinate)
			pnv_ioda2_reserve_m64_pe(pdev->subordinate,
						 pe_bitmap, all);
	}
}

static int pnv_ioda2_pick_m64_pe(struct pci_bus *bus, bool all)
{
	struct pci_controller *hose = pci_bus_to_host(bus);
	struct pnv_phb *phb = hose->private_data;
	struct pnv_ioda_pe *master_pe, *pe;
	unsigned long size, *pe_alloc;
	int i;

	/* Root bus shouldn't use M64 */
	if (pci_is_root_bus(bus))
		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 */
	pnv_ioda2_reserve_m64_pe(bus, pe_alloc, all);

	/*
	 * 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.
	 */
	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_OPAL)) {
		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->name = dn->full_name;
	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;

	pr_info(" MEM64 0x%016llx..0x%016llx -> 0x%016llx\n",
			res->start, res->end, 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 = NULL;
	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 if (pe->flags & PNV_IODA_PE_DEV)
		pdev = pe->pdev->bus->self;
#ifdef CONFIG_PCI_IOV
	else if (pe->flags & PNV_IODA_PE_VF)
		pdev = pe->parent_dev;
#endif /* CONFIG_PCI_IOV */
	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;
}

#ifdef CONFIG_PCI_IOV
static int pnv_ioda_deconfigure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
{
	struct pci_dev *parent;
	uint8_t bcomp, dcomp, fcomp;
	int64_t rc;
	long rid_end, rid;

	/* Currently, we just deconfigure VF PE. Bus PE will always there.*/
	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:
			dev_err(&pe->pbus->dev, "Number of subordinate buses %d unsupported\n",
			        count);
			/* Do an exact match only */
			bcomp = OpalPciBusAll;
		}
		rid_end = pe->rid + (count << 8);
	} else {
		if (pe->flags & PNV_IODA_PE_VF)
			parent = pe->parent_dev;
		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;
	}

	/* Clear the reverse map */
	for (rid = pe->rid; rid < rid_end; rid++)
		phb->ioda.pe_rmap[rid] = 0;

	/* Release from all parents PELT-V */
	while (parent) {
		struct pci_dn *pdn = pci_get_pdn(parent);
		if (pdn && pdn->pe_number != IODA_INVALID_PE) {
			rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number,
						pe->pe_number, OPAL_REMOVE_PE_FROM_DOMAIN);
			/* XXX What to do in case of error ? */
		}
		parent = parent->bus->self;
	}

	opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
				  OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);

	/* Disassociate PE in PELT */
	rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number,
				pe->pe_number, OPAL_REMOVE_PE_FROM_DOMAIN);
	if (rc)
		pe_warn(pe, "OPAL error %ld remove self from PELTV\n", rc);
	rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
			     bcomp, dcomp, fcomp, OPAL_UNMAP_PE);
	if (rc)
		pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc);

	pe->pbus = NULL;
	pe->pdev = NULL;
	pe->parent_dev = NULL;

	return 0;
}
#endif /* CONFIG_PCI_IOV */

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:
			dev_err(&pe->pbus->dev, "Number of subordinate buses %d unsupported\n",
			        count);
			/* Do an exact match only */
			bcomp = OpalPciBusAll;
		}
		rid_end = pe->rid + (count << 8);
	} else {
#ifdef CONFIG_PCI_IOV
		if (pe->flags & PNV_IODA_PE_VF)
			parent = pe->parent_dev;
		else
#endif /* CONFIG_PCI_IOV */
			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. NPUs don't have a PELTV table so skip
	 * configuration on them.
	 */
	if (phb->type != PNV_PHB_NPU)
		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;
}

#ifdef CONFIG_PCI_IOV
static int pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset)
{
	struct pci_dn *pdn = pci_get_pdn(dev);
	int i;
	struct resource *res, res2;
	resource_size_t size;
	u16 num_vfs;

	if (!dev->is_physfn)
		return -EINVAL;

	/*
	 * "offset" is in VFs.  The M64 windows are sized so that when they
	 * are segmented, each segment is the same size as the IOV BAR.
	 * Each segment is in a separate PE, and the high order bits of the
	 * address are the PE number.  Therefore, each VF's BAR is in a
	 * separate PE, and changing the IOV BAR start address changes the
	 * range of PEs the VFs are in.
	 */
	num_vfs = pdn->num_vfs;
	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = &dev->resource[i + PCI_IOV_RESOURCES];
		if (!res->flags || !res->parent)
			continue;

		/*
		 * The actual IOV BAR range is determined by the start address
		 * and the actual size for num_vfs VFs BAR.  This check is to
		 * make sure that after shifting, the range will not overlap
		 * with another device.
		 */
		size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
		res2.flags = res->flags;
		res2.start = res->start + (size * offset);
		res2.end = res2.start + (size * num_vfs) - 1;

		if (res2.end > res->end) {
			dev_err(&dev->dev, "VF BAR%d: %pR would extend past %pR (trying to enable %d VFs shifted by %d)\n",
				i, &res2, res, num_vfs, offset);
			return -EBUSY;
		}
	}

	/*
	 * After doing so, there would be a "hole" in the /proc/iomem when
	 * offset is a positive value. It looks like the device return some
	 * mmio back to the system, which actually no one could use it.
	 */
	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = &dev->resource[i + PCI_IOV_RESOURCES];
		if (!res->flags || !res->parent)
			continue;

		size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
		res2 = *res;
		res->start += size * offset;

		dev_info(&dev->dev, "VF BAR%d: %pR shifted to %pR (%sabling %d VFs shifted by %d)\n",
			 i, &res2, res, (offset > 0) ? "En" : "Dis",
			 num_vfs, offset);
		pci_update_resource(dev, i + PCI_IOV_RESOURCES);
	}
	return 0;
}
#endif /* CONFIG_PCI_IOV */

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_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->flags = PNV_IODA_PE_DEV;
	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;
}

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, bool 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(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 struct pnv_ioda_pe *pnv_ioda_setup_npu_PE(struct pci_dev *npu_pdev)
{
	int pe_num, found_pe = false, rc;
	long rid;
	struct pnv_ioda_pe *pe;
	struct pci_dev *gpu_pdev;
	struct pci_dn *npu_pdn;
	struct pci_controller *hose = pci_bus_to_host(npu_pdev->bus);
	struct pnv_phb *phb = hose->private_data;

	/*
	 * Due to a hardware errata PE#0 on the NPU is reserved for
	 * error handling. This means we only have three PEs remaining
	 * which need to be assigned to four links, implying some
	 * links must share PEs.
	 *
	 * To achieve this we assign PEs such that NPUs linking the
	 * same GPU get assigned the same PE.
	 */
	gpu_pdev = pnv_pci_get_gpu_dev(npu_pdev);
	for (pe_num = 0; pe_num < phb->ioda.total_pe; pe_num++) {
		pe = &phb->ioda.pe_array[pe_num];
		if (!pe->pdev)
			continue;

		if (pnv_pci_get_gpu_dev(pe->pdev) == gpu_pdev) {
			/*
			 * This device has the same peer GPU so should
			 * be assigned the same PE as the existing
			 * peer NPU.
			 */
			dev_info(&npu_pdev->dev,
				"Associating to existing PE %d\n", pe_num);
			pci_dev_get(npu_pdev);
			npu_pdn = pci_get_pdn(npu_pdev);
			rid = npu_pdev->bus->number << 8 | npu_pdn->devfn;
			npu_pdn->pcidev = npu_pdev;
			npu_pdn->pe_number = pe_num;
			pe->dma_weight += pnv_ioda_dma_weight(npu_pdev);
			phb->ioda.pe_rmap[rid] = pe->pe_number;

			/* Map the PE to this link */
			rc = opal_pci_set_pe(phb->opal_id, pe_num, rid,
					OpalPciBusAll,
					OPAL_COMPARE_RID_DEVICE_NUMBER,
					OPAL_COMPARE_RID_FUNCTION_NUMBER,
					OPAL_MAP_PE);
			WARN_ON(rc != OPAL_SUCCESS);
			found_pe = true;
			break;
		}
	}

	if (!found_pe)
		/*
		 * Could not find an existing PE so allocate a new
		 * one.
		 */
		return pnv_ioda_setup_dev_PE(npu_pdev);
	else
		return pe;
}

static void pnv_ioda_setup_npu_PEs(struct pci_bus *bus)
{
	struct pci_dev *pdev;

	list_for_each_entry(pdev, &bus->devices, bus_list)
		pnv_ioda_setup_npu_PE(pdev);
}

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

	pnv_ioda_setup_bus_PE(bus, false);

	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, true);
			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(hose->bus, NULL, true);

		/*
		 * On NPU PHB, we expect separate PEs for individual PCI
		 * functions. PCI bus dependent PEs are required for the
		 * remaining types of PHBs.
		 */
		if (phb->type == PNV_PHB_NPU) {
			/* PE#0 is needed for error reporting */
			pnv_ioda_reserve_pe(phb, 0);
			pnv_ioda_setup_npu_PEs(hose->bus);
		} else
			pnv_ioda_setup_PEs(hose->bus);
	}
}

#ifdef CONFIG_PCI_IOV
static int pnv_pci_vf_release_m64(struct pci_dev *pdev, u16 num_vfs)
{
	struct pci_bus        *bus;
	struct pci_controller *hose;
	struct pnv_phb        *phb;
	struct pci_dn         *pdn;
	int                    i, j;
	int                    m64_bars;

	bus = pdev->bus;
	hose = pci_bus_to_host(bus);
	phb = hose->private_data;
	pdn = pci_get_pdn(pdev);

	if (pdn->m64_single_mode)
		m64_bars = num_vfs;
	else
		m64_bars = 1;

	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
		for (j = 0; j < m64_bars; j++) {
			if (pdn->m64_map[j][i] == IODA_INVALID_M64)
				continue;
			opal_pci_phb_mmio_enable(phb->opal_id,
				OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 0);
			clear_bit(pdn->m64_map[j][i], &phb->ioda.m64_bar_alloc);
			pdn->m64_map[j][i] = IODA_INVALID_M64;
		}

	kfree(pdn->m64_map);
	return 0;
}

static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
{
	struct pci_bus        *bus;
	struct pci_controller *hose;
	struct pnv_phb        *phb;
	struct pci_dn         *pdn;
	unsigned int           win;
	struct resource       *res;
	int                    i, j;
	int64_t                rc;
	int                    total_vfs;
	resource_size_t        size, start;
	int                    pe_num;
	int                    m64_bars;

	bus = pdev->bus;
	hose = pci_bus_to_host(bus);
	phb = hose->private_data;
	pdn = pci_get_pdn(pdev);
	total_vfs = pci_sriov_get_totalvfs(pdev);

	if (pdn->m64_single_mode)
		m64_bars = num_vfs;
	else
		m64_bars = 1;

	pdn->m64_map = kmalloc(sizeof(*pdn->m64_map) * m64_bars, GFP_KERNEL);
	if (!pdn->m64_map)
		return -ENOMEM;
	/* Initialize the m64_map to IODA_INVALID_M64 */
	for (i = 0; i < m64_bars ; i++)
		for (j = 0; j < PCI_SRIOV_NUM_BARS; j++)
			pdn->m64_map[i][j] = IODA_INVALID_M64;


	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = &pdev->resource[i + PCI_IOV_RESOURCES];
		if (!res->flags || !res->parent)
			continue;

		for (j = 0; j < m64_bars; j++) {
			do {
				win = find_next_zero_bit(&phb->ioda.m64_bar_alloc,
						phb->ioda.m64_bar_idx + 1, 0);

				if (win >= phb->ioda.m64_bar_idx + 1)
					goto m64_failed;
			} while (test_and_set_bit(win, &phb->ioda.m64_bar_alloc));

			pdn->m64_map[j][i] = win;

			if (pdn->m64_single_mode) {
				size = pci_iov_resource_size(pdev,
							PCI_IOV_RESOURCES + i);
				start = res->start + size * j;
			} else {
				size = resource_size(res);
				start = res->start;
			}

			/* Map the M64 here */
			if (pdn->m64_single_mode) {
				pe_num = pdn->offset + j;
				rc = opal_pci_map_pe_mmio_window(phb->opal_id,
						pe_num, OPAL_M64_WINDOW_TYPE,
						pdn->m64_map[j][i], 0);
			}

			rc = opal_pci_set_phb_mem_window(phb->opal_id,
						 OPAL_M64_WINDOW_TYPE,
						 pdn->m64_map[j][i],
						 start,
						 0, /* unused */
						 size);


			if (rc != OPAL_SUCCESS) {
				dev_err(&pdev->dev, "Failed to map M64 window #%d: %lld\n",
					win, rc);
				goto m64_failed;
			}

			if (pdn->m64_single_mode)
				rc = opal_pci_phb_mmio_enable(phb->opal_id,
				     OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 2);
			else
				rc = opal_pci_phb_mmio_enable(phb->opal_id,
				     OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 1);

			if (rc != OPAL_SUCCESS) {
				dev_err(&pdev->dev, "Failed to enable M64 window #%d: %llx\n",
					win, rc);
				goto m64_failed;
			}
		}
	}
	return 0;

m64_failed:
	pnv_pci_vf_release_m64(pdev, num_vfs);
	return -EBUSY;
}

static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group,
		int num);
static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable);

static void pnv_pci_ioda2_release_dma_pe(struct pci_dev *dev, struct pnv_ioda_pe *pe)
{
	struct iommu_table    *tbl;
	int64_t               rc;

	tbl = pe->table_group.tables[0];
	rc = pnv_pci_ioda2_unset_window(&pe->table_group, 0);
	if (rc)
		pe_warn(pe, "OPAL error %ld release DMA window\n", rc);

	pnv_pci_ioda2_set_bypass(pe, false);
	if (pe->table_group.group) {
		iommu_group_put(pe->table_group.group);
		BUG_ON(pe->table_group.group);
	}
	pnv_pci_ioda2_table_free_pages(tbl);
	iommu_free_table(tbl, of_node_full_name(dev->dev.of_node));
}

static void pnv_ioda_release_vf_PE(struct pci_dev *pdev)
{
	struct pci_bus        *bus;
	struct pci_controller *hose;
	struct pnv_phb        *phb;
	struct pnv_ioda_pe    *pe, *pe_n;
	struct pci_dn         *pdn;

	bus = pdev->bus;
	hose = pci_bus_to_host(bus);
	phb = hose->private_data;
	pdn = pci_get_pdn(pdev);

	if (!pdev->is_physfn)
		return;

	list_for_each_entry_safe(pe, pe_n, &phb->ioda.pe_list, list) {
		if (pe->parent_dev != pdev)
			continue;

		pnv_pci_ioda2_release_dma_pe(pdev, pe);

		/* Remove from list */
		mutex_lock(&phb->ioda.pe_list_mutex);
		list_del(&pe->list);
		mutex_unlock(&phb->ioda.pe_list_mutex);

		pnv_ioda_deconfigure_pe(phb, pe);

		pnv_ioda_free_pe(phb, pe->pe_number);
	}
}

void pnv_pci_sriov_disable(struct pci_dev *pdev)
{
	struct pci_bus        *bus;
	struct pci_controller *hose;
	struct pnv_phb        *phb;
	struct pci_dn         *pdn;
	struct pci_sriov      *iov;
	u16 num_vfs;

	bus = pdev->bus;
	hose = pci_bus_to_host(bus);
	phb = hose->private_data;
	pdn = pci_get_pdn(pdev);
	iov = pdev->sriov;
	num_vfs = pdn->num_vfs;

	/* Release VF PEs */
	pnv_ioda_release_vf_PE(pdev);

	if (phb->type == PNV_PHB_IODA2) {
		if (!pdn->m64_single_mode)
			pnv_pci_vf_resource_shift(pdev, -pdn->offset);

		/* Release M64 windows */
		pnv_pci_vf_release_m64(pdev, num_vfs);

		/* Release PE numbers */
		bitmap_clear(phb->ioda.pe_alloc, pdn->offset, num_vfs);
		pdn->offset = 0;
	}
}

static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
				       struct pnv_ioda_pe *pe);
static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs)
{
	struct pci_bus        *bus;
	struct pci_controller *hose;
	struct pnv_phb        *phb;
	struct pnv_ioda_pe    *pe;
	int                    pe_num;
	u16                    vf_index;
	struct pci_dn         *pdn;

	bus = pdev->bus;
	hose = pci_bus_to_host(bus);
	phb = hose->private_data;
	pdn = pci_get_pdn(pdev);

	if (!pdev->is_physfn)
		return;

	/* Reserve PE for each VF */
	for (vf_index = 0; vf_index < num_vfs; vf_index++) {
		pe_num = pdn->offset + vf_index;

		pe = &phb->ioda.pe_array[pe_num];
		pe->pe_number = pe_num;
		pe->phb = phb;
		pe->flags = PNV_IODA_PE_VF;
		pe->pbus = NULL;
		pe->parent_dev = pdev;
		pe->tce32_seg = -1;
		pe->mve_number = -1;
		pe->rid = (pci_iov_virtfn_bus(pdev, vf_index) << 8) |
			   pci_iov_virtfn_devfn(pdev, vf_index);

		pe_info(pe, "VF %04d:%02d:%02d.%d associated with PE#%d\n",
			hose->global_number, pdev->bus->number,
			PCI_SLOT(pci_iov_virtfn_devfn(pdev, vf_index)),
			PCI_FUNC(pci_iov_virtfn_devfn(pdev, vf_index)), 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->pdev = NULL;
			continue;
		}

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

		pnv_pci_ioda2_setup_dma_pe(phb, pe);
	}
}

int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
{
	struct pci_bus        *bus;
	struct pci_controller *hose;
	struct pnv_phb        *phb;
	struct pci_dn         *pdn;
	int                    ret;

	bus = pdev->bus;
	hose = pci_bus_to_host(bus);
	phb = hose->private_data;
	pdn = pci_get_pdn(pdev);

	if (phb->type == PNV_PHB_IODA2) {
		if (!pdn->vfs_expanded) {
			dev_info(&pdev->dev, "don't support this SRIOV device"
				" with non 64bit-prefetchable IOV BAR\n");
			return -ENOSPC;
		}

		/*
		 * When M64 BARs functions in Single PE mode, the number of VFs
		 * could be enabled must be less than the number of M64 BARs.
		 */
		if (pdn->m64_single_mode && num_vfs > phb->ioda.m64_bar_idx) {
			dev_info(&pdev->dev, "Not enough M64 BAR for VFs\n");
			return -EBUSY;
		}

		/* Calculate available PE for required VFs */
		mutex_lock(&phb->ioda.pe_alloc_mutex);
		pdn->offset = bitmap_find_next_zero_area(
			phb->ioda.pe_alloc, phb->ioda.total_pe,
			0, num_vfs, 0);
		if (pdn->offset >= phb->ioda.total_pe) {
			mutex_unlock(&phb->ioda.pe_alloc_mutex);
			dev_info(&pdev->dev, "Failed to enable VF%d\n", num_vfs);
			pdn->offset = 0;
			return -EBUSY;
		}
		bitmap_set(phb->ioda.pe_alloc, pdn->offset, num_vfs);
		pdn->num_vfs = num_vfs;
		mutex_unlock(&phb->ioda.pe_alloc_mutex);

		/* Assign M64 window accordingly */
		ret = pnv_pci_vf_assign_m64(pdev, num_vfs);
		if (ret) {
			dev_info(&pdev->dev, "Not enough M64 window resources\n");
			goto m64_failed;
		}

		/*
		 * When using one M64 BAR to map one IOV BAR, we need to shift
		 * the IOV BAR according to the PE# allocated to the VFs.
		 * Otherwise, the PE# for the VF will conflict with others.
		 */
		if (!pdn->m64_single_mode) {
			ret = pnv_pci_vf_resource_shift(pdev, pdn->offset);
			if (ret)
				goto m64_failed;
		}
	}

	/* Setup VF PEs */
	pnv_ioda_setup_vf_PE(pdev, num_vfs);

	return 0;

m64_failed:
	bitmap_clear(phb->ioda.pe_alloc, pdn->offset, num_vfs);
	pdn->offset = 0;

	return ret;
}

int pcibios_sriov_disable(struct pci_dev *pdev)
{
	pnv_pci_sriov_disable(pdev);

	/* Release PCI data */
	remove_dev_pci_data(pdev);
	return 0;
}

int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
{
	/* Allocate PCI data */
	add_dev_pci_data(pdev);

	return pnv_pci_sriov_enable(pdev, num_vfs);
}
#endif /* CONFIG_PCI_IOV */

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_dma_offset(&pdev->dev, pe->tce_bypass_base);
	set_iommu_table_base(&pdev->dev, pe->table_group.tables[0]);
	/*
	 * Note: iommu_add_device() will fail here as
	 * for physical PE: the device is already added by now;
	 * for virtual PE: sysfs entries are not ready yet and
	 * tce_iommu_bus_notifier will add the device to a group later.
	 */
}

static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
{
	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
	struct pnv_phb *phb = hose->private_data;
	struct pci_dn *pdn = pci_get_pdn(pdev);
	struct pnv_ioda_pe *pe;
	uint64_t top;
	bool bypass = false;
	struct pci_dev *linked_npu_dev;
	int i;

	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);
	} else {
		dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n");
		set_dma_ops(&pdev->dev, &dma_iommu_ops);
	}
	*pdev->dev.dma_mask = dma_mask;

	/* Update peer npu devices */
	if (pe->flags & PNV_IODA_PE_PEER)
		for (i = 0; i < PNV_IODA_MAX_PEER_PES; i++) {
			if (!pe->peers[i])
				continue;

			linked_npu_dev = pe->peers[i]->pdev;
			if (dma_get_mask(&linked_npu_dev->dev) != dma_mask)
				dma_set_mask(&linked_npu_dev->dev, dma_mask);
		}

	return 0;
}

static u64 pnv_pci_ioda_dma_get_required_mask(struct pci_dev *pdev)
{
	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
	struct pnv_phb *phb = hose->private_data;
	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)
{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		set_iommu_table_base(&dev->dev, pe->table_group.tables[0]);
		set_dma_offset(&dev->dev, pe->tce_bypass_base);
		iommu_add_device(&dev->dev);

		if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
			pnv_ioda_setup_bus_dma(pe, dev->subordinate);
	}
}

static void pnv_pci_ioda1_tce_invalidate(struct iommu_table *tbl,
		unsigned long index, unsigned long npages, bool rm)
{
	struct iommu_table_group_link *tgl = list_first_entry_or_null(
			&tbl->it_group_list, struct iommu_table_group_link,
			next);
	struct pnv_ioda_pe *pe = container_of(tgl->table_group,
			struct pnv_ioda_pe, table_group);
	__be64 __iomem *invalidate = rm ?
		(__be64 __iomem *)pe->phb->ioda.tce_inval_reg_phys :
		pe->phb->ioda.tce_inval_reg;
	unsigned long start, end, inc;
	const unsigned shift = tbl->it_page_shift;

	start = __pa(((__be64 *)tbl->it_base) + index - tbl->it_offset);
	end = __pa(((__be64 *)tbl->it_base) + index - tbl->it_offset +
			npages - 1);

	/* 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 int pnv_ioda1_tce_build(struct iommu_table *tbl, long index,
		long npages, unsigned long uaddr,
		enum dma_data_direction direction,
		struct dma_attrs *attrs)
{
	int ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
			attrs);

	if (!ret && (tbl->it_type & TCE_PCI_SWINV_CREATE))
		pnv_pci_ioda1_tce_invalidate(tbl, index, npages, false);

	return ret;
}

#ifdef CONFIG_IOMMU_API
static int pnv_ioda1_tce_xchg(struct iommu_table *tbl, long index,
		unsigned long *hpa, enum dma_data_direction *direction)
{
	long ret = pnv_tce_xchg(tbl, index, hpa, direction);

	if (!ret && (tbl->it_type &
			(TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE)))
		pnv_pci_ioda1_tce_invalidate(tbl, index, 1, false);

	return ret;
}
#endif

static void pnv_ioda1_tce_free(struct iommu_table *tbl, long index,
		long npages)
{
	pnv_tce_free(tbl, index, npages);

	if (tbl->it_type & TCE_PCI_SWINV_FREE)
		pnv_pci_ioda1_tce_invalidate(tbl, index, npages, false);
}

static struct iommu_table_ops pnv_ioda1_iommu_ops = {
	.set = pnv_ioda1_tce_build,
#ifdef CONFIG_IOMMU_API
	.exchange = pnv_ioda1_tce_xchg,
#endif
	.clear = pnv_ioda1_tce_free,
	.get = pnv_tce_get,
};

static inline void pnv_pci_ioda2_tce_invalidate_entire(struct pnv_ioda_pe *pe)
{
	/* 01xb - invalidate TCEs that match the specified PE# */
	unsigned long val = (0x4ull << 60) | (pe->pe_number & 0xFF);
	struct pnv_phb *phb = pe->phb;
	struct pnv_ioda_pe *npe;
	int i;

	if (!phb->ioda.tce_inval_reg)
		return;

	mb(); /* Ensure above stores are visible */
	__raw_writeq(cpu_to_be64(val), phb->ioda.tce_inval_reg);

	if (pe->flags & PNV_IODA_PE_PEER)
		for (i = 0; i < PNV_IODA_MAX_PEER_PES; i++) {
			npe = pe->peers[i];
			if (!npe || npe->phb->type != PNV_PHB_NPU)
				continue;

			pnv_npu_tce_invalidate_entire(npe);
		}
}

static void pnv_pci_ioda2_do_tce_invalidate(unsigned pe_number, bool rm,
		__be64 __iomem *invalidate, unsigned shift,
		unsigned long index, unsigned long npages)
{
	unsigned long start, end, inc;

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

	/* Figure out the start, end and step */
	start |= (index << shift);
	end |= ((index + npages - 1) << 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;
	}
}

static void pnv_pci_ioda2_tce_invalidate(struct iommu_table *tbl,
		unsigned long index, unsigned long npages, bool rm)
{
	struct iommu_table_group_link *tgl;

	list_for_each_entry_rcu(tgl, &tbl->it_group_list, next) {
		struct pnv_ioda_pe *npe;
		struct pnv_ioda_pe *pe = container_of(tgl->table_group,
				struct pnv_ioda_pe, table_group);
		__be64 __iomem *invalidate = rm ?
			(__be64 __iomem *)pe->phb->ioda.tce_inval_reg_phys :
			pe->phb->ioda.tce_inval_reg;
		int i;

		pnv_pci_ioda2_do_tce_invalidate(pe->pe_number, rm,
			invalidate, tbl->it_page_shift,
			index, npages);

		if (pe->flags & PNV_IODA_PE_PEER)
			/* Invalidate PEs using the same TCE table */
			for (i = 0; i < PNV_IODA_MAX_PEER_PES; i++) {
				npe = pe->peers[i];
				if (!npe || npe->phb->type != PNV_PHB_NPU)
					continue;

				pnv_npu_tce_invalidate(npe, tbl, index,
							npages, rm);
			}
	}
}

static int pnv_ioda2_tce_build(struct iommu_table *tbl, long index,
		long npages, unsigned long uaddr,
		enum dma_data_direction direction,
		struct dma_attrs *attrs)
{
	int ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
			attrs);

	if (!ret && (tbl->it_type & TCE_PCI_SWINV_CREATE))
		pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false);

	return ret;
}

#ifdef CONFIG_IOMMU_API
static int pnv_ioda2_tce_xchg(struct iommu_table *tbl, long index,
		unsigned long *hpa, enum dma_data_direction *direction)
{
	long ret = pnv_tce_xchg(tbl, index, hpa, direction);

	if (!ret && (tbl->it_type &
			(TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE)))
		pnv_pci_ioda2_tce_invalidate(tbl, index, 1, false);

	return ret;
}
#endif

static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index,
		long npages)
{
	pnv_tce_free(tbl, index, npages);

	if (tbl->it_type & TCE_PCI_SWINV_FREE)
		pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false);
}

static void pnv_ioda2_table_free(struct iommu_table *tbl)
{
	pnv_pci_ioda2_table_free_pages(tbl);
	iommu_free_table(tbl, "pnv");
}

static struct iommu_table_ops pnv_ioda2_iommu_ops = {
	.set = pnv_ioda2_tce_build,
#ifdef CONFIG_IOMMU_API
	.exchange = pnv_ioda2_tce_xchg,
#endif
	.clear = pnv_ioda2_tce_free,
	.get = pnv_tce_get,
	.free = pnv_ioda2_table_free,
};

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;
	struct iommu_table *tbl;
	unsigned int i;
	int64_t rc;
	void *addr;

	/* 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;

	tbl = pnv_pci_table_alloc(phb->hose->node);
	iommu_register_group(&pe->table_group, phb->hose->global_number,
			pe->pe_number);
	pnv_pci_link_table_and_group(phb->hose->node, 0, tbl, &pe->table_group);

	/* 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 */
	pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
				  base << 28, IOMMU_PAGE_SHIFT_4K);

	/* OPAL variant of P7IOC SW invalidated TCEs */
	if (phb->ioda.tce_inval_reg)
		tbl->it_type |= (TCE_PCI_SWINV_CREATE |
				 TCE_PCI_SWINV_FREE   |
				 TCE_PCI_SWINV_PAIR);

	tbl->it_ops = &pnv_ioda1_iommu_ops;
	pe->table_group.tce32_start = tbl->it_offset << tbl->it_page_shift;
	pe->table_group.tce32_size = tbl->it_size << tbl->it_page_shift;
	iommu_init_table(tbl, phb->hose->node);

	if (pe->flags & PNV_IODA_PE_DEV) {
		/*
		 * Setting table base here only for carrying iommu_group
		 * further down to let iommu_add_device() do the job.
		 * pnv_pci_ioda_dma_dev_setup will override it later anyway.
		 */
		set_iommu_table_base(&pe->pdev->dev, tbl);
		iommu_add_device(&pe->pdev->dev);
	} else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
		pnv_ioda_setup_bus_dma(pe, pe->pbus);

	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));
	if (tbl) {
		pnv_pci_unlink_table_and_group(tbl, &pe->table_group);
		iommu_free_table(tbl, "pnv");
	}
}

static long pnv_pci_ioda2_set_window(struct iommu_table_group *table_group,
		int num, struct iommu_table *tbl)
{
	struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
			table_group);
	struct pnv_phb *phb = pe->phb;
	int64_t rc;
	const unsigned long size = tbl->it_indirect_levels ?
			tbl->it_level_size : tbl->it_size;
	const __u64 start_addr = tbl->it_offset << tbl->it_page_shift;
	const __u64 win_size = tbl->it_size << tbl->it_page_shift;

	pe_info(pe, "Setting up window#%d %llx..%llx pg=%x\n", num,
			start_addr, start_addr + win_size - 1,
			IOMMU_PAGE_SIZE(tbl));

	/*
	 * 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) + num,
			tbl->it_indirect_levels + 1,
			__pa(tbl->it_base),
			size << 3,
			IOMMU_PAGE_SIZE(tbl));
	if (rc) {
		pe_err(pe, "Failed to configure TCE table, err %ld\n", rc);
		return rc;
	}

	pnv_pci_link_table_and_group(phb->hose->node, num,
			tbl, &pe->table_group);
	pnv_pci_ioda2_tce_invalidate_entire(pe);

	return 0;
}

static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable)
{
	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);
	}
	if (rc)
		pe_err(pe, "OPAL error %lld configuring bypass window\n", rc);
	else
		pe->tce_bypass_enabled = enable;
}

static long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset,
		__u32 page_shift, __u64 window_size, __u32 levels,
		struct iommu_table *tbl);

static long pnv_pci_ioda2_create_table(struct iommu_table_group *table_group,
		int num, __u32 page_shift, __u64 window_size, __u32 levels,
		struct iommu_table **ptbl)
{
	struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
			table_group);
	int nid = pe->phb->hose->node;
	__u64 bus_offset = num ? pe->tce_bypass_base : table_group->tce32_start;
	long ret;
	struct iommu_table *tbl;

	tbl = pnv_pci_table_alloc(nid);
	if (!tbl)
		return -ENOMEM;

	ret = pnv_pci_ioda2_table_alloc_pages(nid,
			bus_offset, page_shift, window_size,
			levels, tbl);
	if (ret) {
		iommu_free_table(tbl, "pnv");
		return ret;
	}

	tbl->it_ops = &pnv_ioda2_iommu_ops;
	if (pe->phb->ioda.tce_inval_reg)
		tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);

	*ptbl = tbl;

	return 0;
}

static long pnv_pci_ioda2_setup_default_config(struct pnv_ioda_pe *pe)
{
	struct iommu_table *tbl = NULL;
	long rc;

	/*
	 * crashkernel= specifies the kdump kernel's maximum memory at
	 * some offset and there is no guaranteed the result is a power
	 * of 2, which will cause errors later.
	 */
	const u64 max_memory = __rounddown_pow_of_two(memory_hotplug_max());

	/*
	 * In memory constrained environments, e.g. kdump kernel, the
	 * DMA window can be larger than available memory, which will
	 * cause errors later.
	 */
	const u64 window_size = min((u64)pe->table_group.tce32_size, max_memory);

	rc = pnv_pci_ioda2_create_table(&pe->table_group, 0,
			IOMMU_PAGE_SHIFT_4K,
			window_size,
			POWERNV_IOMMU_DEFAULT_LEVELS, &tbl);
	if (rc) {
		pe_err(pe, "Failed to create 32-bit TCE table, err %ld",
				rc);
		return rc;
	}

	iommu_init_table(tbl, pe->phb->hose->node);

	rc = pnv_pci_ioda2_set_window(&pe->table_group, 0, tbl);
	if (rc) {
		pe_err(pe, "Failed to configure 32-bit TCE table, err %ld\n",
				rc);
		pnv_ioda2_table_free(tbl);
		return rc;
	}

	if (!pnv_iommu_bypass_disabled)
		pnv_pci_ioda2_set_bypass(pe, true);

	/* OPAL variant of PHB3 invalidated TCEs */
	if (pe->phb->ioda.tce_inval_reg)
		tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);

	/*
	 * Setting table base here only for carrying iommu_group
	 * further down to let iommu_add_device() do the job.
	 * pnv_pci_ioda_dma_dev_setup will override it later anyway.
	 */
	if (pe->flags & PNV_IODA_PE_DEV)
		set_iommu_table_base(&pe->pdev->dev, tbl);

	return 0;
}

#if defined(CONFIG_IOMMU_API) || defined(CONFIG_PCI_IOV)
static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group,
		int num)
{
	struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
			table_group);
	struct pnv_phb *phb = pe->phb;
	long ret;

	pe_info(pe, "Removing DMA window #%d\n", num);

	ret = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
			(pe->pe_number << 1) + num,
			0/* levels */, 0/* table address */,
			0/* table size */, 0/* page size */);
	if (ret)
		pe_warn(pe, "Unmapping failed, ret = %ld\n", ret);
	else
		pnv_pci_ioda2_tce_invalidate_entire(pe);

	pnv_pci_unlink_table_and_group(table_group->tables[num], table_group);

	return ret;
}
#endif

#ifdef CONFIG_IOMMU_API
static unsigned long pnv_pci_ioda2_get_table_size(__u32 page_shift,
		__u64 window_size, __u32 levels)
{
	unsigned long bytes = 0;
	const unsigned window_shift = ilog2(window_size);
	unsigned entries_shift = window_shift - page_shift;
	unsigned table_shift = entries_shift + 3;
	unsigned long tce_table_size = max(0x1000UL, 1UL << table_shift);
	unsigned long direct_table_size;

	if (!levels || (levels > POWERNV_IOMMU_MAX_LEVELS) ||
			(window_size > memory_hotplug_max()) ||
			!is_power_of_2(window_size))
		return 0;

	/* Calculate a direct table size from window_size and levels */
	entries_shift = (entries_shift + levels - 1) / levels;
	table_shift = entries_shift + 3;
	table_shift = max_t(unsigned, table_shift, PAGE_SHIFT);
	direct_table_size =  1UL << table_shift;

	for ( ; levels; --levels) {
		bytes += _ALIGN_UP(tce_table_size, direct_table_size);

		tce_table_size /= direct_table_size;
		tce_table_size <<= 3;
		tce_table_size = _ALIGN_UP(tce_table_size, direct_table_size);
	}

	return bytes;
}

static void pnv_ioda2_take_ownership(struct iommu_table_group *table_group)
{
	struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
						table_group);
	/* Store @tbl as pnv_pci_ioda2_unset_window() resets it */
	struct iommu_table *tbl = pe->table_group.tables[0];

	pnv_pci_ioda2_set_bypass(pe, false);
	pnv_pci_ioda2_unset_window(&pe->table_group, 0);
	pnv_ioda2_table_free(tbl);
}

static void pnv_ioda2_release_ownership(struct iommu_table_group *table_group)
{
	struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
						table_group);

	pnv_pci_ioda2_setup_default_config(pe);
}

static struct iommu_table_group_ops pnv_pci_ioda2_ops = {
	.get_table_size = pnv_pci_ioda2_get_table_size,
	.create_table = pnv_pci_ioda2_create_table,
	.set_window = pnv_pci_ioda2_set_window,
	.unset_window = pnv_pci_ioda2_unset_window,
	.take_ownership = pnv_ioda2_take_ownership,
	.release_ownership = pnv_ioda2_release_ownership,
};
#endif

static void pnv_pci_ioda_setup_opal_tce_kill(struct pnv_phb *phb)
{
	const __be64 *swinvp;

	/* OPAL variant of PHB3 invalidated TCEs */
	swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
	if (!swinvp)
		return;

	phb->ioda.tce_inval_reg_phys = be64_to_cpup(swinvp);
	phb->ioda.tce_inval_reg = ioremap(phb->ioda.tce_inval_reg_phys, 8);
}

static __be64 *pnv_pci_ioda2_table_do_alloc_pages(int nid, unsigned shift,
		unsigned levels, unsigned long limit,
		unsigned long *current_offset, unsigned long *total_allocated)
{
	struct page *tce_mem = NULL;
	__be64 *addr, *tmp;
	unsigned order = max_t(unsigned, shift, PAGE_SHIFT) - PAGE_SHIFT;
	unsigned long allocated = 1UL << (order + PAGE_SHIFT);
	unsigned entries = 1UL << (shift - 3);
	long i;

	tce_mem = alloc_pages_node(nid, GFP_KERNEL, order);
	if (!tce_mem) {
		pr_err("Failed to allocate a TCE memory, order=%d\n", order);
		return NULL;
	}
	addr = page_address(tce_mem);
	memset(addr, 0, allocated);
	*total_allocated += allocated;

	--levels;
	if (!levels) {
		*current_offset += allocated;
		return addr;
	}

	for (i = 0; i < entries; ++i) {
		tmp = pnv_pci_ioda2_table_do_alloc_pages(nid, shift,
				levels, limit, current_offset, total_allocated);
		if (!tmp)
			break;

		addr[i] = cpu_to_be64(__pa(tmp) |
				TCE_PCI_READ | TCE_PCI_WRITE);

		if (*current_offset >= limit)
			break;
	}

	return addr;
}

static void pnv_pci_ioda2_table_do_free_pages(__be64 *addr,
		unsigned long size, unsigned level);

static long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset,
		__u32 page_shift, __u64 window_size, __u32 levels,
		struct iommu_table *tbl)
{
	void *addr;
	unsigned long offset = 0, level_shift, total_allocated = 0;
	const unsigned window_shift = ilog2(window_size);
	unsigned entries_shift = window_shift - page_shift;
	unsigned table_shift = max_t(unsigned, entries_shift + 3, PAGE_SHIFT);
	const unsigned long tce_table_size = 1UL << table_shift;

	if (!levels || (levels > POWERNV_IOMMU_MAX_LEVELS))
		return -EINVAL;

	if ((window_size > memory_hotplug_max()) || !is_power_of_2(window_size))
		return -EINVAL;

	/* Adjust direct table size from window_size and levels */
	entries_shift = (entries_shift + levels - 1) / levels;
	level_shift = entries_shift + 3;
	level_shift = max_t(unsigned, level_shift, PAGE_SHIFT);

	/* Allocate TCE table */
	addr = pnv_pci_ioda2_table_do_alloc_pages(nid, level_shift,
			levels, tce_table_size, &offset, &total_allocated);

	/* addr==NULL means that the first level allocation failed */
	if (!addr)
		return -ENOMEM;

	/*
	 * First level was allocated but some lower level failed as
	 * we did not allocate as much as we wanted,
	 * release partially allocated table.
	 */
	if (offset < tce_table_size) {
		pnv_pci_ioda2_table_do_free_pages(addr,
				1ULL << (level_shift - 3), levels - 1);
		return -ENOMEM;
	}

	/* Setup linux iommu table */
	pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, bus_offset,
			page_shift);
	tbl->it_level_size = 1ULL << (level_shift - 3);
	tbl->it_indirect_levels = levels - 1;
	tbl->it_allocated_size = total_allocated;

	pr_devel("Created TCE table: ws=%08llx ts=%lx @%08llx\n",
			window_size, tce_table_size, bus_offset);

	return 0;
}

static void pnv_pci_ioda2_table_do_free_pages(__be64 *addr,
		unsigned long size, unsigned level)
{
	const unsigned long addr_ul = (unsigned long) addr &
			~(TCE_PCI_READ | TCE_PCI_WRITE);

	if (level) {
		long i;
		u64 *tmp = (u64 *) addr_ul;

		for (i = 0; i < size; ++i) {
			unsigned long hpa = be64_to_cpu(tmp[i]);

			if (!(hpa & (TCE_PCI_READ | TCE_PCI_WRITE)))
				continue;

			pnv_pci_ioda2_table_do_free_pages(__va(hpa), size,
					level - 1);
		}
	}

	free_pages(addr_ul, get_order(size << 3));
}

static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl)
{
	const unsigned long size = tbl->it_indirect_levels ?
			tbl->it_level_size : tbl->it_size;

	if (!tbl->it_size)
		return;

	pnv_pci_ioda2_table_do_free_pages((__be64 *)tbl->it_base, size,
			tbl->it_indirect_levels);
}

static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
				       struct pnv_ioda_pe *pe)
{
	int64_t rc;

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

	/* TVE #1 is selected by PCI address bit 59 */
	pe->tce_bypass_base = 1ull << 59;

	iommu_register_group(&pe->table_group, phb->hose->global_number,
			pe->pe_number);

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

	/* Setup linux iommu table */
	pe->table_group.tce32_start = 0;
	pe->table_group.tce32_size = phb->ioda.m32_pci_base;
	pe->table_group.max_dynamic_windows_supported =
			IOMMU_TABLE_GROUP_MAX_TABLES;
	pe->table_group.max_levels = POWERNV_IOMMU_MAX_LEVELS;
	pe->table_group.pgsizes = SZ_4K | SZ_64K | SZ_16M;
#ifdef CONFIG_IOMMU_API
	pe->table_group.ops = &pnv_pci_ioda2_ops;
#endif

	rc = pnv_pci_ioda2_setup_default_config(pe);
	if (rc) {
		if (pe->tce32_seg >= 0)
			pe->tce32_seg = -1;
		return;
	}

	if (pe->flags & PNV_IODA_PE_DEV)
		iommu_add_device(&pe->pdev->dev);
	else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
		pnv_ioda_setup_bus_dma(pe, pe->pbus);
}

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);

	pnv_pci_ioda_setup_opal_tce_kill(phb);

	/* 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 if (phb->type == PNV_PHB_IODA2) {
			pe_info(pe, "Assign DMA32 space\n");
			segs = 0;
			pnv_pci_ioda2_setup_dma_pe(phb, pe);
		} else if (phb->type == PNV_PHB_NPU) {
			/*
			 * We initialise the DMA space for an NPU PHB
			 * after setup of the PHB is complete as we
			 * point the NPU TVT to the the same location
			 * as the PHB3 TVT.
			 */
		}

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

	return of_node_get(hose->dn);
}
EXPORT_SYMBOL(pnv_pci_get_phb_node);

int pnv_phb_to_cxl_mode(struct pci_dev *dev, uint64_t mode)
{
	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, mode, 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_mode);

/* 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);
	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 (dev->no_64bit_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 */

#ifdef CONFIG_PCI_IOV
static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev)
{
	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
	struct pnv_phb *phb = hose->private_data;
	const resource_size_t gate = phb->ioda.m64_segsize >> 2;
	struct resource *res;
	int i;
	resource_size_t size, total_vf_bar_sz;
	struct pci_dn *pdn;
	int mul, total_vfs;

	if (!pdev->is_physfn || pdev->is_added)
		return;

	pdn = pci_get_pdn(pdev);
	pdn->vfs_expanded = 0;
	pdn->m64_single_mode = false;

	total_vfs = pci_sriov_get_totalvfs(pdev);
	mul = phb->ioda.total_pe;
	total_vf_bar_sz = 0;

	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = &pdev->resource[i + PCI_IOV_RESOURCES];
		if (!res->flags || res->parent)
			continue;
		if (!pnv_pci_is_mem_pref_64(res->flags)) {
			dev_warn(&pdev->dev, "Don't support SR-IOV with"
					" non M64 VF BAR%d: %pR. \n",
				 i, res);
			goto truncate_iov;
		}

		total_vf_bar_sz += pci_iov_resource_size(pdev,
				i + PCI_IOV_RESOURCES);

		/*
		 * If bigger than quarter of M64 segment size, just round up
		 * power of two.
		 *
		 * Generally, one M64 BAR maps one IOV BAR. To avoid conflict
		 * with other devices, IOV BAR size is expanded to be
		 * (total_pe * VF_BAR_size).  When VF_BAR_size is half of M64
		 * segment size , the expanded size would equal to half of the
		 * whole M64 space size, which will exhaust the M64 Space and
		 * limit the system flexibility.  This is a design decision to
		 * set the boundary to quarter of the M64 segment size.
		 */
		if (total_vf_bar_sz > gate) {
			mul = roundup_pow_of_two(total_vfs);
			dev_info(&pdev->dev,
				"VF BAR Total IOV size %llx > %llx, roundup to %d VFs\n",
				total_vf_bar_sz, gate, mul);
			pdn->m64_single_mode = true;
			break;
		}
	}

	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = &pdev->resource[i + PCI_IOV_RESOURCES];
		if (!res->flags || res->parent)
			continue;

		size = pci_iov_resource_size(pdev, i + PCI_IOV_RESOURCES);
		/*
		 * On PHB3, the minimum size alignment of M64 BAR in single
		 * mode is 32MB.
		 */
		if (pdn->m64_single_mode && (size < SZ_32M))
			goto truncate_iov;
		dev_dbg(&pdev->dev, " Fixing VF BAR%d: %pR to\n", i, res);
		res->end = res->start + size * mul - 1;
		dev_dbg(&pdev->dev, "                       %pR\n", res);
		dev_info(&pdev->dev, "VF BAR%d: %pR (expanded to %d VFs for PE alignment)",
			 i, res, mul);
	}
	pdn->vfs_expanded = mul;

	return;

truncate_iov:
	/* To save MMIO space, IOV BAR is truncated. */
	for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
		res = &pdev->resource[i + PCI_IOV_RESOURCES];
		res->flags = 0;
		res->end = res->start - 1;
	}
}
#endif /* CONFIG_PCI_IOV */

/*
 * 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) &&
			   !pnv_pci_is_mem_pref_64(res->flags)) {
			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;

		/* NPU PHB does not support IO or MMIO segmentation */
		if (phb->type == PNV_PHB_NPU)
			continue;

		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_npu_ioda_fixup(void)
{
	bool enable_bypass;
	struct pci_controller *hose, *tmp;
	struct pnv_phb *phb;
	struct pnv_ioda_pe *pe;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		phb = hose->private_data;
		if (phb->type != PNV_PHB_NPU)
			continue;

		list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
			enable_bypass = dma_get_mask(&pe->pdev->dev) ==
				DMA_BIT_MASK(64);
			pnv_npu_init_dma_pe(pe);
			pnv_npu_dma_set_bypass(pe, enable_bypass);
		}
	}
}

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

	/* Link NPU IODA tables to their PCI devices. */
	pnv_npu_ioda_fixup();
}

/*
 * 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;
}

#ifdef CONFIG_PCI_IOV
static resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev,
						      int resno)
{
	struct pci_controller *hose = pci_bus_to_host(pdev->bus);
	struct pnv_phb *phb = hose->private_data;
	struct pci_dn *pdn = pci_get_pdn(pdev);
	resource_size_t align;

	/*
	 * On PowerNV platform, IOV BAR is mapped by M64 BAR to enable the
	 * SR-IOV. While from hardware perspective, the range mapped by M64
	 * BAR should be size aligned.
	 *
	 * When IOV BAR is mapped with M64 BAR in Single PE mode, the extra
	 * powernv-specific hardware restriction is gone. But if just use the
	 * VF BAR size as the alignment, PF BAR / VF BAR may be allocated with
	 * in one segment of M64 #15, which introduces the PE conflict between
	 * PF and VF. Based on this, the minimum alignment of an IOV BAR is
	 * m64_segsize.
	 *
	 * This function returns the total IOV BAR size if M64 BAR is in
	 * Shared PE mode or just VF BAR size if not.
	 * If the M64 BAR is in Single PE mode, return the VF BAR size or
	 * M64 segment size if IOV BAR size is less.
	 */
	align = pci_iov_resource_size(pdev, resno);
	if (!pdn->vfs_expanded)
		return align;
	if (pdn->m64_single_mode)
		return max(align, (resource_size_t)phb->ioda.m64_segsize);

	return pdn->vfs_expanded * align;
}
#endif /* CONFIG_PCI_IOV */

/* Prevent enabling devices for which we couldn't properly
 * assign a PE
 */
static bool 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 true;

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

	return true;
}

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 pci_controller *hose)
{
	struct pnv_phb *phb = hose->private_data;

	opal_pci_reset(phb->opal_id, OPAL_RESET_PCI_IODA_TABLE,
		       OPAL_ASSERT_RESET);
}

static const struct pci_controller_ops pnv_pci_ioda_controller_ops = {
       .dma_dev_setup = pnv_pci_dma_dev_setup,
#ifdef CONFIG_PCI_MSI
       .setup_msi_irqs = pnv_setup_msi_irqs,
       .teardown_msi_irqs = pnv_teardown_msi_irqs,
#endif
       .enable_device_hook = pnv_pci_enable_device_hook,
       .window_alignment = pnv_pci_window_alignment,
       .reset_secondary_bus = pnv_pci_reset_secondary_bus,
       .dma_set_mask = pnv_pci_ioda_dma_set_mask,
       .dma_get_required_mask = pnv_pci_ioda_dma_get_required_mask,
       .shutdown = pnv_pci_ioda_shutdown,
};

static const struct pci_controller_ops pnv_npu_ioda_controller_ops = {
	.dma_dev_setup = pnv_pci_dma_dev_setup,
#ifdef CONFIG_PCI_MSI
	.setup_msi_irqs = pnv_setup_msi_irqs,
	.teardown_msi_irqs = pnv_teardown_msi_irqs,
#endif
	.enable_device_hook = pnv_pci_enable_device_hook,
	.window_alignment = pnv_pci_window_alignment,
	.reset_secondary_bus = pnv_pci_reset_secondary_bus,
	.dma_set_mask = pnv_npu_dma_set_mask,
	.shutdown = pnv_pci_ioda_shutdown,
};

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 = memblock_virt_alloc(sizeof(struct pnv_phb), 0);

	/* Allocate PCI controller */
	phb->hose = hose = pcibios_alloc_controller(np);
	if (!phb->hose) {
		pr_err("  Can't allocate PCI controller for %s\n",
		       np->full_name);
		memblock_free(__pa(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;
	mutex_init(&phb->ioda.pe_alloc_mutex);

	/* 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 if (of_device_is_compatible(np, "ibm,power8-npu-pciex"))
		phb->model = PNV_PHB_MODEL_NPU;
	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 = memblock_virt_alloc(size, 0);
	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);
	mutex_init(&phb->ioda.pe_list_mutex);

	/* 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;

	/* 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;

	/* 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;

	if (phb->type == PNV_PHB_NPU)
		hose->controller_ops = pnv_npu_ioda_controller_ops;
	else
		hose->controller_ops = pnv_pci_ioda_controller_ops;

#ifdef CONFIG_PCI_IOV
	ppc_md.pcibios_fixup_sriov = pnv_pci_ioda_fixup_iov_resources;
	ppc_md.pcibios_iov_resource_alignment = pnv_pci_iov_resource_alignment;
#endif

	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");
		pnv_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL);
		pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE);
	}

	/* 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_npu_phb(struct device_node *np)
{
	pnv_pci_init_ioda_phb(np, 0, PNV_PHB_NPU);
}

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);
	}
}