/*
 * 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"

#define PNV_IODA1_M64_NUM	16	/* Number of M64 BARs	*/
#define PNV_IODA1_M64_SEGS	8	/* Segments per M64 BAR	*/
#define PNV_IODA1_DMA32_SEGSIZE	0x10000000

#define POWERNV_IOMMU_DEFAULT_LEVELS	1
#define POWERNV_IOMMU_MAX_LEVELS	5

static const char * const pnv_phb_names[] = { "IODA1", "IODA2", "NPU" };
static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl);

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# %.2x] %pV",
	       level, pfix, pe->pe_number, &vaf);

	va_end(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_m64(struct pnv_phb *phb, struct resource *r)
{
	/*
	 * WARNING: We cannot rely on the resource flags. The Linux PCI
	 * allocation code sometimes decides to put a 64-bit prefetchable
	 * BAR in the 32-bit window, so we have to compare the addresses.
	 *
	 * For simplicity we only test resource start.
	 */
	return (r->start >= phb->ioda.m64_base &&
		r->start < (phb->ioda.m64_base + phb->ioda.m64_size));
}

static inline bool pnv_pci_is_m64_flags(unsigned long resource_flags)
{
	unsigned long flags = (IORESOURCE_MEM_64 | IORESOURCE_PREFETCH);

	return (resource_flags & flags) == flags;
}

static struct pnv_ioda_pe *pnv_ioda_init_pe(struct pnv_phb *phb, int pe_no)
{
	s64 rc;

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

	/*
	 * Clear the PE frozen state as it might be put into frozen state
	 * in the last PCI remove path. It's not harmful to do so when the
	 * PE is already in unfrozen state.
	 */
	rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no,
				       OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
	if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
		pr_warn("%s: Error %lld unfreezing PHB#%x-PE#%x\n",
			__func__, rc, phb->hose->global_number, pe_no);

	return &phb->ioda.pe_array[pe_no];
}

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

	pnv_ioda_init_pe(phb, pe_no);
}

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

	for (pe = phb->ioda.total_pe_num - 1; pe >= 0; pe--) {
		if (!test_and_set_bit(pe, phb->ioda.pe_alloc))
			return pnv_ioda_init_pe(phb, pe);
	}

	return NULL;
}

static void pnv_ioda_free_pe(struct pnv_ioda_pe *pe)
{
	struct pnv_phb *phb = pe->phb;
	unsigned int pe_num = pe->pe_number;

	WARN_ON(pe->pdev);

	memset(pe, 0, sizeof(struct pnv_ioda_pe));
	clear_bit(pe_num, 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;
	}

	/*
	 * Exclude the segments for reserved and root bus PE, which
	 * are first or last two PEs.
	 */
	r = &phb->hose->mem_resources[1];
	if (phb->ioda.reserved_pe_idx == 0)
		r->start += (2 * phb->ioda.m64_segsize);
	else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1))
		r->end -= (2 * phb->ioda.m64_segsize);
	else
		pr_warn("  Cannot strip M64 segment for reserved PE#%x\n",
			phb->ioda.reserved_pe_idx);

	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_ioda_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_m64(phb, r))
			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 int pnv_ioda1_init_m64(struct pnv_phb *phb)
{
	struct resource *r;
	int index;

	/*
	 * There are 16 M64 BARs, each of which has 8 segments. So
	 * there are as many M64 segments as the maximum number of
	 * PEs, which is 128.
	 */
	for (index = 0; index < PNV_IODA1_M64_NUM; index++) {
		unsigned long base, segsz = phb->ioda.m64_segsize;
		int64_t rc;

		base = phb->ioda.m64_base +
		       index * PNV_IODA1_M64_SEGS * segsz;
		rc = opal_pci_set_phb_mem_window(phb->opal_id,
				OPAL_M64_WINDOW_TYPE, index, base, 0,
				PNV_IODA1_M64_SEGS * segsz);
		if (rc != OPAL_SUCCESS) {
			pr_warn("  Error %lld setting M64 PHB#%x-BAR#%d\n",
				rc, phb->hose->global_number, index);
			goto fail;
		}

		rc = opal_pci_phb_mmio_enable(phb->opal_id,
				OPAL_M64_WINDOW_TYPE, index,
				OPAL_ENABLE_M64_SPLIT);
		if (rc != OPAL_SUCCESS) {
			pr_warn("  Error %lld enabling M64 PHB#%x-BAR#%d\n",
				rc, phb->hose->global_number, index);
			goto fail;
		}
	}

	/*
	 * Exclude the segments for reserved and root bus PE, which
	 * are first or last two PEs.
	 */
	r = &phb->hose->mem_resources[1];
	if (phb->ioda.reserved_pe_idx == 0)
		r->start += (2 * phb->ioda.m64_segsize);
	else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1))
		r->end -= (2 * phb->ioda.m64_segsize);
	else
		WARN(1, "Wrong reserved PE#%x on PHB#%x\n",
		     phb->ioda.reserved_pe_idx, phb->hose->global_number);

	return 0;

fail:
	for ( ; index >= 0; index--)
		opal_pci_phb_mmio_enable(phb->opal_id,
			OPAL_M64_WINDOW_TYPE, index, OPAL_DISABLE_M64);

	return -EIO;
}

static void pnv_ioda_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_ioda_reserve_dev_m64_pe(pdev, pe_bitmap);

		if (all && pdev->subordinate)
			pnv_ioda_reserve_m64_pe(pdev->subordinate,
						pe_bitmap, all);
	}
}

static struct pnv_ioda_pe *pnv_ioda_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 NULL;

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

	/* Figure out reserved PE numbers by the PE */
	pnv_ioda_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_num)) {
		kfree(pe_alloc);
		return NULL;
	}

	/*
	 * 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_num, i + 1)) <
		phb->ioda.total_pe_num) {
		pe = &phb->ioda.pe_array[i];

		phb->ioda.m64_segmap[pe->pe_number] = pe->pe_number;
		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);
		}

		/*
		 * P7IOC supports M64DT, which helps mapping M64 segment
		 * to one particular PE#. However, PHB3 has fixed mapping
		 * between M64 segment and PE#. In order to have same logic
		 * for P7IOC and PHB3, we enforce fixed mapping between M64
		 * segment and PE# on P7IOC.
		 */
		if (phb->type == PNV_PHB_IODA1) {
			int64_t rc;

			rc = opal_pci_map_pe_mmio_window(phb->opal_id,
					pe->pe_number, OPAL_M64_WINDOW_TYPE,
					pe->pe_number / PNV_IODA1_M64_SEGS,
					pe->pe_number % PNV_IODA1_M64_SEGS);
			if (rc != OPAL_SUCCESS)
				pr_warn("%s: Error %lld mapping M64 for PHB#%x-PE#%x\n",
					__func__, rc, phb->hose->global_number,
					pe->pe_number);
		}
	}

	kfree(pe_alloc);
	return master_pe;
}

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;
	u32 m64_range[2], i;
	const __be32 *r;
	u64 pci_addr;

	if (phb->type != PNV_PHB_IODA1 && 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;
	}

	/*
	 * Find the available M64 BAR range and pickup the last one for
	 * covering the whole 64-bits space. We support only one range.
	 */
	if (of_property_read_u32_array(dn, "ibm,opal-available-m64-ranges",
				       m64_range, 2)) {
		/* In absence of the property, assume 0..15 */
		m64_range[0] = 0;
		m64_range[1] = 16;
	}
	/* We only support 64 bits in our allocator */
	if (m64_range[1] > 63) {
		pr_warn("%s: Limiting M64 range to 63 (from %d) on PHB#%x\n",
			__func__, m64_range[1], phb->hose->global_number);
		m64_range[1] = 63;
	}
	/* Empty range, no m64 */
	if (m64_range[1] <= m64_range[0]) {
		pr_warn("%s: M64 empty, disabling M64 usage on PHB#%x\n",
			__func__, phb->hose->global_number);
		return;
	}

	/* Configure M64 informations */
	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_num;
	phb->ioda.m64_base = pci_addr;

	/* This lines up nicely with the display from processing OF ranges */
	pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx (M64 #%d..%d)\n",
		res->start, res->end, pci_addr, m64_range[0],
		m64_range[0] + m64_range[1] - 1);

	/* Mark all M64 used up by default */
	phb->ioda.m64_bar_alloc = (unsigned long)-1;

	/* Use last M64 BAR to cover M64 window */
	m64_range[1]--;
	phb->ioda.m64_bar_idx = m64_range[0] + m64_range[1];

	pr_info(" Using M64 #%d as default window\n", phb->ioda.m64_bar_idx);

	/* Mark remaining ones free */
	for (i = m64_range[0]; i < m64_range[1]; i++)
		clear_bit(i, &phb->ioda.m64_bar_alloc);

	/*
	 * Setup init functions for M64 based on IODA version, IODA3 uses
	 * the IODA2 code.
	 */
	if (phb->type == PNV_PHB_IODA1)
		phb->init_m64 = pnv_ioda1_init_m64;
	else
		phb->init_m64 = pnv_ioda2_init_m64;
	phb->reserve_m64_pe = pnv_ioda_reserve_m64_pe;
	phb->pick_m64_pe = pnv_ioda_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_num)
		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
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;
}

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 {
#ifdef CONFIG_PCI_IOV
		if (pe->flags & PNV_IODA_PE_VF)
			parent = pe->parent_dev;
		else
#endif
			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] = IODA_INVALID_PE;

	/* 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;
#ifdef CONFIG_PCI_IOV
	pe->parent_dev = NULL;
#endif

	return 0;
}

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

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

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

		switch(count) {
		case  1: bcomp = OpalPciBusAll;		break;
		case  2: bcomp = OpalPciBus7Bits;	break;
		case  4: bcomp = OpalPciBus6Bits;	break;
		case  8: bcomp = OpalPciBus5Bits;	break;
		case 16: bcomp = OpalPciBus4Bits;	break;
		case 32: bcomp = OpalPciBus3Bits;	break;
		default:
			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 %x\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 %x\n",
			       rc, pe->mve_number);
			pe->mve_number = -1;
		}
	}

out:
	return 0;
}

#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;

	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 = pnv_ioda_alloc_pe(phb);
	if (!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
	 */
	pci_dev_get(dev);
	pdn->pcidev = dev;
	pdn->pe_number = pe->pe_number;
	pe->flags = PNV_IODA_PE_DEV;
	pe->pdev = dev;
	pe->pbus = NULL;
	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 ? */
		pnv_ioda_free_pe(pe);
		pdn->pe_number = IODA_INVALID_PE;
		pe->pdev = NULL;
		pci_dev_put(dev);
		return NULL;
	}

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

	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;
		}

		/*
		 * In partial hotplug case, the PCI device might be still
		 * associated with the PE and needn't attach it to the PE
		 * again.
		 */
		if (pdn->pe_number != IODA_INVALID_PE)
			continue;

		pe->device_count++;
		pdn->pcidev = dev;
		pdn->pe_number = pe->pe_number;
		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 struct pnv_ioda_pe *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 = NULL;
	unsigned int pe_num;

	/*
	 * In partial hotplug case, the PE instance might be still alive.
	 * We should reuse it instead of allocating a new one.
	 */
	pe_num = phb->ioda.pe_rmap[bus->number << 8];
	if (pe_num != IODA_INVALID_PE) {
		pe = &phb->ioda.pe_array[pe_num];
		pnv_ioda_setup_same_PE(bus, pe);
		return NULL;
	}

	/* PE number for root bus should have been reserved */
	if (pci_is_root_bus(bus) &&
	    phb->ioda.root_pe_idx != IODA_INVALID_PE)
		pe = &phb->ioda.pe_array[phb->ioda.root_pe_idx];

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

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

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

	pe->flags |= (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS);
	pe->pbus = bus;
	pe->pdev = NULL;
	pe->mve_number = -1;
	pe->rid = bus->busn_res.start << 8;

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

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

	/* 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);

	return 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_num; 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 %x\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;
			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_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;
		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);
		}
	}
}

#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->pe_num_map[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(pe);
	}
}

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

	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->pe_num_map);

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

		/* Release PE numbers */
		if (pdn->m64_single_mode) {
			for (i = 0; i < num_vfs; i++) {
				if (pdn->pe_num_map[i] == IODA_INVALID_PE)
					continue;

				pe = &phb->ioda.pe_array[pdn->pe_num_map[i]];
				pnv_ioda_free_pe(pe);
			}
		} else
			bitmap_clear(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs);
		/* Releasing pe_num_map */
		kfree(pdn->pe_num_map);
	}
}

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++) {
		if (pdn->m64_single_mode)
			pe_num = pdn->pe_num_map[vf_index];
		else
			pe_num = *pdn->pe_num_map + 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->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#%x\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 ? */
			pnv_ioda_free_pe(pe);
			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 pnv_ioda_pe    *pe;
	struct pci_dn         *pdn;
	int                    ret;
	u16                    i;

	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;
		}

		/* Allocating pe_num_map */
		if (pdn->m64_single_mode)
			pdn->pe_num_map = kmalloc(sizeof(*pdn->pe_num_map) * num_vfs,
					GFP_KERNEL);
		else
			pdn->pe_num_map = kmalloc(sizeof(*pdn->pe_num_map), GFP_KERNEL);

		if (!pdn->pe_num_map)
			return -ENOMEM;

		if (pdn->m64_single_mode)
			for (i = 0; i < num_vfs; i++)
				pdn->pe_num_map[i] = IODA_INVALID_PE;

		/* Calculate available PE for required VFs */
		if (pdn->m64_single_mode) {
			for (i = 0; i < num_vfs; i++) {
				pe = pnv_ioda_alloc_pe(phb);
				if (!pe) {
					ret = -EBUSY;
					goto m64_failed;
				}

				pdn->pe_num_map[i] = pe->pe_number;
			}
		} else {
			mutex_lock(&phb->ioda.pe_alloc_mutex);
			*pdn->pe_num_map = bitmap_find_next_zero_area(
				phb->ioda.pe_alloc, phb->ioda.total_pe_num,
				0, num_vfs, 0);
			if (*pdn->pe_num_map >= phb->ioda.total_pe_num) {
				mutex_unlock(&phb->ioda.pe_alloc_mutex);
				dev_info(&pdev->dev, "Failed to enable VF%d\n", num_vfs);
				kfree(pdn->pe_num_map);
				return -EBUSY;
			}
			bitmap_set(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs);
			mutex_unlock(&phb->ioda.pe_alloc_mutex);
		}
		pdn->num_vfs = num_vfs;

		/* 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->pe_num_map);
			if (ret)
				goto m64_failed;
		}
	}

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

	return 0;

m64_failed:
	if (pdn->m64_single_mode) {
		for (i = 0; i < num_vfs; i++) {
			if (pdn->pe_num_map[i] == IODA_INVALID_PE)
				continue;

			pe = &phb->ioda.pe_array[pdn->pe_num_map[i]];
			pnv_ioda_free_pe(pe);
		}
	} else
		bitmap_clear(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs);

	/* Releasing pe_num_map */
	kfree(pdn->pe_num_map);

	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;

	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 */
	pnv_npu_try_dma_set_bypass(pdev, bypass);

	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 inline __be64 __iomem *pnv_ioda_get_inval_reg(struct pnv_phb *phb,
						     bool real_mode)
{
	return real_mode ? (__be64 __iomem *)(phb->regs_phys + 0x210) :
		(phb->regs + 0x210);
}

static void pnv_pci_p7ioc_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 = pnv_ioda_get_inval_reg(pe->phb, rm);
	unsigned long start, end, inc;

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

	/* p7ioc-style invalidation, 2 TCEs per write */
	start |= (1ull << 63);
	end |= (1ull << 63);
	inc = 16;
        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,
		unsigned long attrs)
{
	int ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
			attrs);

	if (!ret)
		pnv_pci_p7ioc_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)
		pnv_pci_p7ioc_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);

	pnv_pci_p7ioc_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,
};

#define PHB3_TCE_KILL_INVAL_ALL		PPC_BIT(0)
#define PHB3_TCE_KILL_INVAL_PE		PPC_BIT(1)
#define PHB3_TCE_KILL_INVAL_ONE		PPC_BIT(2)

void pnv_pci_phb3_tce_invalidate_entire(struct pnv_phb *phb, bool rm)
{
	__be64 __iomem *invalidate = pnv_ioda_get_inval_reg(phb, rm);
	const unsigned long val = PHB3_TCE_KILL_INVAL_ALL;

	mb(); /* Ensure previous TCE table stores are visible */
	if (rm)
		__raw_rm_writeq(cpu_to_be64(val), invalidate);
	else
		__raw_writeq(cpu_to_be64(val), invalidate);
}

static inline void pnv_pci_phb3_tce_invalidate_pe(struct pnv_ioda_pe *pe)
{
	/* 01xb - invalidate TCEs that match the specified PE# */
	__be64 __iomem *invalidate = pnv_ioda_get_inval_reg(pe->phb, false);
	unsigned long val = PHB3_TCE_KILL_INVAL_PE | (pe->pe_number & 0xFF);

	mb(); /* Ensure above stores are visible */
	__raw_writeq(cpu_to_be64(val), invalidate);
}

static void pnv_pci_phb3_tce_invalidate(struct pnv_ioda_pe *pe, bool rm,
					unsigned shift, unsigned long index,
					unsigned long npages)
{
	__be64 __iomem *invalidate = pnv_ioda_get_inval_reg(pe->phb, rm);
	unsigned long start, end, inc;

	/* We'll invalidate DMA address in PE scope */
	start = PHB3_TCE_KILL_INVAL_ONE;
	start |= (pe->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 inline void pnv_pci_ioda2_tce_invalidate_pe(struct pnv_ioda_pe *pe)
{
	struct pnv_phb *phb = pe->phb;

	if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
		pnv_pci_phb3_tce_invalidate_pe(pe);
	else
		opal_pci_tce_kill(phb->opal_id, OPAL_PCI_TCE_KILL_PE,
				  pe->pe_number, 0, 0, 0);
}

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 *pe = container_of(tgl->table_group,
				struct pnv_ioda_pe, table_group);
		struct pnv_phb *phb = pe->phb;
		unsigned int shift = tbl->it_page_shift;

		if (phb->type == PNV_PHB_NPU) {
			/*
			 * The NVLink hardware does not support TCE kill
			 * per TCE entry so we have to invalidate
			 * the entire cache for it.
			 */
			pnv_pci_phb3_tce_invalidate_entire(phb, rm);
			continue;
		}
		if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
			pnv_pci_phb3_tce_invalidate(pe, rm, shift,
						    index, npages);
		else if (rm)
			opal_rm_pci_tce_kill(phb->opal_id,
					     OPAL_PCI_TCE_KILL_PAGES,
					     pe->pe_number, 1u << shift,
					     index << shift, npages);
		else
			opal_pci_tce_kill(phb->opal_id,
					  OPAL_PCI_TCE_KILL_PAGES,
					  pe->pe_number, 1u << shift,
					  index << shift, npages);
	}
}

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

	if (!ret)
		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)
		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);

	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 int pnv_pci_ioda_dev_dma_weight(struct pci_dev *dev, void *data)
{
	unsigned int *weight = (unsigned int *)data;

	/* This is quite simplistic. The "base" weight of a device
	 * is 10. 0 means no DMA is to be accounted for it.
	 */
	if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
		return 0;

	if (dev->class == PCI_CLASS_SERIAL_USB_UHCI ||
	    dev->class == PCI_CLASS_SERIAL_USB_OHCI ||
	    dev->class == PCI_CLASS_SERIAL_USB_EHCI)
		*weight += 3;
	else if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID)
		*weight += 15;
	else
		*weight += 10;

	return 0;
}

static unsigned int pnv_pci_ioda_pe_dma_weight(struct pnv_ioda_pe *pe)
{
	unsigned int weight = 0;

	/* SRIOV VF has same DMA32 weight as its PF */
#ifdef CONFIG_PCI_IOV
	if ((pe->flags & PNV_IODA_PE_VF) && pe->parent_dev) {
		pnv_pci_ioda_dev_dma_weight(pe->parent_dev, &weight);
		return weight;
	}
#endif

	if ((pe->flags & PNV_IODA_PE_DEV) && pe->pdev) {
		pnv_pci_ioda_dev_dma_weight(pe->pdev, &weight);
	} else if ((pe->flags & PNV_IODA_PE_BUS) && pe->pbus) {
		struct pci_dev *pdev;

		list_for_each_entry(pdev, &pe->pbus->devices, bus_list)
			pnv_pci_ioda_dev_dma_weight(pdev, &weight);
	} else if ((pe->flags & PNV_IODA_PE_BUS_ALL) && pe->pbus) {
		pci_walk_bus(pe->pbus, pnv_pci_ioda_dev_dma_weight, &weight);
	}

	return weight;
}

static void pnv_pci_ioda1_setup_dma_pe(struct pnv_phb *phb,
				       struct pnv_ioda_pe *pe)
{

	struct page *tce_mem = NULL;
	struct iommu_table *tbl;
	unsigned int weight, total_weight = 0;
	unsigned int tce32_segsz, base, segs, avail, 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 */
	weight = pnv_pci_ioda_pe_dma_weight(pe);
	if (!weight)
		return;

	pci_walk_bus(phb->hose->bus, pnv_pci_ioda_dev_dma_weight,
		     &total_weight);
	segs = (weight * phb->ioda.dma32_count) / total_weight;
	if (!segs)
		segs = 1;

	/*
	 * Allocate contiguous DMA32 segments. We begin with the expected
	 * number of segments. With one more attempt, the number of DMA32
	 * segments to be allocated is decreased by one until one segment
	 * is allocated successfully.
	 */
	do {
		for (base = 0; base <= phb->ioda.dma32_count - segs; base++) {
			for (avail = 0, i = base; i < base + segs; i++) {
				if (phb->ioda.dma32_segmap[i] ==
				    IODA_INVALID_PE)
					avail++;
			}

			if (avail == segs)
				goto found;
		}
	} while (--segs);

	if (!segs) {
		pe_warn(pe, "No available DMA32 segments\n");
		return;
	}

found:
	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_info(pe, "DMA weight %d (%d), assigned (%d) %d DMA32 segments\n",
		weight, total_weight, base, segs);
	pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
		base * PNV_IODA1_DMA32_SEGSIZE,
		(base + segs) * PNV_IODA1_DMA32_SEGSIZE - 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
	 *
	 * Each TCE page is 4KB in size and each TCE entry occupies 8
	 * bytes
	 */
	tce32_segsz = PNV_IODA1_DMA32_SEGSIZE >> (IOMMU_PAGE_SHIFT_4K - 3);
	tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
				   get_order(tce32_segsz * 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_segsz * 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_segsz * i,
					      tce32_segsz, IOMMU_PAGE_SIZE_4K);
		if (rc) {
			pe_err(pe, " Failed to configure 32-bit TCE table,"
			       " err %ld\n", rc);
			goto fail;
		}
	}

	/* Setup DMA32 segment mapping */
	for (i = base; i < base + segs; i++)
		phb->ioda.dma32_segmap[i] = pe->pe_number;

	/* Setup linux iommu table */
	pnv_pci_setup_iommu_table(tbl, addr, tce32_segsz * segs,
				  base * PNV_IODA1_DMA32_SEGSIZE,
				  IOMMU_PAGE_SHIFT_4K);

	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 (tce_mem)
		__free_pages(tce_mem, get_order(tce32_segsz * 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_pe(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;

	*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);

	/*
	 * 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_pe(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,
};

static int gpe_table_group_to_npe_cb(struct device *dev, void *opaque)
{
	struct pci_controller *hose;
	struct pnv_phb *phb;
	struct pnv_ioda_pe **ptmppe = opaque;
	struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
	struct pci_dn *pdn = pci_get_pdn(pdev);

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

	hose = pci_bus_to_host(pdev->bus);
	phb = hose->private_data;
	if (phb->type != PNV_PHB_NPU)
		return 0;

	*ptmppe = &phb->ioda.pe_array[pdn->pe_number];

	return 1;
}

/*
 * This returns PE of associated NPU.
 * This assumes that NPU is in the same IOMMU group with GPU and there is
 * no other PEs.
 */
static struct pnv_ioda_pe *gpe_table_group_to_npe(
		struct iommu_table_group *table_group)
{
	struct pnv_ioda_pe *npe = NULL;
	int ret = iommu_group_for_each_dev(table_group->group, &npe,
			gpe_table_group_to_npe_cb);

	BUG_ON(!ret || !npe);

	return npe;
}

static long pnv_pci_ioda2_npu_set_window(struct iommu_table_group *table_group,
		int num, struct iommu_table *tbl)
{
	long ret = pnv_pci_ioda2_set_window(table_group, num, tbl);

	if (ret)
		return ret;

	ret = pnv_npu_set_window(gpe_table_group_to_npe(table_group), num, tbl);
	if (ret)
		pnv_pci_ioda2_unset_window(table_group, num);

	return ret;
}

static long pnv_pci_ioda2_npu_unset_window(
		struct iommu_table_group *table_group,
		int num)
{
	long ret = pnv_pci_ioda2_unset_window(table_group, num);

	if (ret)
		return ret;

	return pnv_npu_unset_window(gpe_table_group_to_npe(table_group), num);
}

static void pnv_ioda2_npu_take_ownership(struct iommu_table_group *table_group)
{
	/*
	 * Detach NPU first as pnv_ioda2_take_ownership() will destroy
	 * the iommu_table if 32bit DMA is enabled.
	 */
	pnv_npu_take_ownership(gpe_table_group_to_npe(table_group));
	pnv_ioda2_take_ownership(table_group);
}

static struct iommu_table_group_ops pnv_pci_ioda2_npu_ops = {
	.get_table_size = pnv_pci_ioda2_get_table_size,
	.create_table = pnv_pci_ioda2_create_table,
	.set_window = pnv_pci_ioda2_npu_set_window,
	.unset_window = pnv_pci_ioda2_npu_unset_window,
	.take_ownership = pnv_ioda2_npu_take_ownership,
	.release_ownership = pnv_ioda2_release_ownership,
};

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

	/*
	 * Now we have all PHBs discovered, time to add NPU devices to
	 * the corresponding IOMMU groups.
	 */
	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_list, list) {
			gpe = pnv_pci_npu_setup_iommu(pe);
			if (gpe)
				gpe->table_group.ops = &pnv_pci_ioda2_npu_ops;
		}
	}
}
#else /* !CONFIG_IOMMU_API */
static void pnv_pci_ioda_setup_iommu_api(void) { };
#endif

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;

	if (!pnv_pci_ioda_pe_dma_weight(pe))
		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_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)
		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);
}

#ifdef CONFIG_PCI_MSI
int64_t pnv_opal_pci_msi_eoi(struct irq_chip *chip, unsigned int hw_irq)
{
	struct pnv_phb *phb = container_of(chip, struct pnv_phb,
					   ioda.irq_chip);

	return opal_pci_msi_eoi(phb->opal_id, hw_irq);
}

static void pnv_ioda2_msi_eoi(struct irq_data *d)
{
	int64_t rc;
	unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
	struct irq_chip *chip = irq_data_get_irq_chip(d);

	rc = pnv_opal_pci_msi_eoi(chip, hw_irq);
	WARN_ON_ONCE(rc);

	icp_native_eoi(d);
}


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

	/* The MSI EOI OPAL call is only needed on PHB3 */
	if (phb->model != PNV_PHB_MODEL_PHB3)
		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);
}

/*
 * Returns true iff chip is something that we could call
 * pnv_opal_pci_msi_eoi for.
 */
bool is_pnv_opal_msi(struct irq_chip *chip)
{
	return chip->irq_eoi == pnv_ioda2_msi_eoi;
}
EXPORT_SYMBOL_GPL(is_pnv_opal_msi);

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);

	pnv_set_msi_irq_chip(phb, virq);

	pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d),"
		 " address=%x_%08x data=%x PE# %x\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_num;
	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_m64_flags(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 */

static void pnv_ioda_setup_pe_res(struct pnv_ioda_pe *pe,
				  struct resource *res)
{
	struct pnv_phb *phb = pe->phb;
	struct pci_bus_region region;
	int index;
	int64_t rc;

	if (!res || !res->flags || res->start > res->end)
		return;

	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_num &&
		       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: Error %lld mapping IO segment#%d to PE#%x\n",
				       __func__, rc, index, pe->pe_number);
				break;
			}

			region.start += phb->ioda.io_segsize;
			index++;
		}
	} else if ((res->flags & IORESOURCE_MEM) &&
		   !pnv_pci_is_m64(phb, res)) {
		region.start = res->start -
			       phb->hose->mem_offset[0] -
			       phb->ioda.m32_pci_base;
		region.end   = res->end -
			       phb->hose->mem_offset[0] -
			       phb->ioda.m32_pci_base;
		index = region.start / phb->ioda.m32_segsize;

		while (index < phb->ioda.total_pe_num &&
		       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: Error %lld mapping M32 segment#%d to PE#%x",
				       __func__, rc, index, pe->pe_number);
				break;
			}

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

/*
 * 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 pnv_ioda_pe *pe)
{
	struct pci_dev *pdev;
	int i;

	/*
	 * 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)));

	list_for_each_entry(pdev, &pe->pbus->devices, bus_list) {
		for (i = 0; i <= PCI_ROM_RESOURCE; i++)
			pnv_ioda_setup_pe_res(pe, &pdev->resource[i]);

		/*
		 * If the PE contains all subordinate PCI buses, the
		 * windows of the child bridges should be mapped to
		 * the PE as well.
		 */
		if (!(pe->flags & PNV_IODA_PE_BUS_ALL) || !pci_is_bridge(pdev))
			continue;
		for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
			pnv_ioda_setup_pe_res(pe,
				&pdev->resource[PCI_BRIDGE_RESOURCES + i]);
	}
}

#ifdef CONFIG_DEBUG_FS
static int pnv_pci_diag_data_set(void *data, u64 val)
{
	struct pci_controller *hose;
	struct pnv_phb *phb;
	s64 ret;

	if (val != 1ULL)
		return -EINVAL;

	hose = (struct pci_controller *)data;
	if (!hose || !hose->private_data)
		return -ENODEV;

	phb = hose->private_data;

	/* Retrieve the diag data from firmware */
	ret = opal_pci_get_phb_diag_data2(phb->opal_id, phb->diag.blob,
					  PNV_PCI_DIAG_BUF_SIZE);
	if (ret != OPAL_SUCCESS)
		return -EIO;

	/* Print the diag data to the kernel log */
	pnv_pci_dump_phb_diag_data(phb->hose, phb->diag.blob);
	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(pnv_pci_diag_data_fops, NULL,
			pnv_pci_diag_data_set, "%llu\n");

#endif /* CONFIG_DEBUG_FS */

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;

		/* Notify initialization of PHB done */
		phb->initialized = 1;

		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);
			continue;
		}

		debugfs_create_file("dump_diag_regs", 0200, phb->dbgfs, hose,
				    &pnv_pci_diag_data_fops);
	}
#endif /* CONFIG_DEBUG_FS */
}

static void pnv_pci_ioda_fixup(void)
{
	pnv_pci_ioda_setup_PEs();
	pnv_pci_ioda_setup_iommu_api();
	pnv_pci_ioda_create_dbgfs();

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

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

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

		bridge = bridge->bus->self;
	}

	/*
	 * We fall back to M32 if M64 isn't supported. We enforce the M64
	 * alignment for any 64-bit resource, PCIe doesn't care and
	 * bridges only do 64-bit prefetchable anyway.
	 */
	if (phb->ioda.m64_segsize && pnv_pci_is_m64_flags(type))
		return phb->ioda.m64_segsize;
	if (type & IORESOURCE_MEM)
		return phb->ioda.m32_segsize;

	return phb->ioda.io_segsize;
}

/*
 * We are updating root port or the upstream port of the
 * bridge behind the root port with PHB's windows in order
 * to accommodate the changes on required resources during
 * PCI (slot) hotplug, which is connected to either root
 * port or the downstream ports of PCIe switch behind the
 * root port.
 */
static void pnv_pci_fixup_bridge_resources(struct pci_bus *bus,
					   unsigned long type)
{
	struct pci_controller *hose = pci_bus_to_host(bus);
	struct pnv_phb *phb = hose->private_data;
	struct pci_dev *bridge = bus->self;
	struct resource *r, *w;
	bool msi_region = false;
	int i;

	/* Check if we need apply fixup to the bridge's windows */
	if (!pci_is_root_bus(bridge->bus) &&
	    !pci_is_root_bus(bridge->bus->self->bus))
		return;

	/* Fixup the resources */
	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
		r = &bridge->resource[PCI_BRIDGE_RESOURCES + i];
		if (!r->flags || !r->parent)
			continue;

		w = NULL;
		if (r->flags & type & IORESOURCE_IO)
			w = &hose->io_resource;
		else if (pnv_pci_is_m64(phb, r) &&
			 (type & IORESOURCE_PREFETCH) &&
			 phb->ioda.m64_segsize)
			w = &hose->mem_resources[1];
		else if (r->flags & type & IORESOURCE_MEM) {
			w = &hose->mem_resources[0];
			msi_region = true;
		}

		r->start = w->start;
		r->end = w->end;

		/* The 64KB 32-bits MSI region shouldn't be included in
		 * the 32-bits bridge window. Otherwise, we can see strange
		 * issues. One of them is EEH error observed on Garrison.
		 *
		 * Exclude top 1MB region which is the minimal alignment of
		 * 32-bits bridge window.
		 */
		if (msi_region) {
			r->end += 0x10000;
			r->end -= 0x100000;
		}
	}
}

static void pnv_pci_setup_bridge(struct pci_bus *bus, unsigned long type)
{
	struct pci_controller *hose = pci_bus_to_host(bus);
	struct pnv_phb *phb = hose->private_data;
	struct pci_dev *bridge = bus->self;
	struct pnv_ioda_pe *pe;
	bool all = (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE);

	/* Extend bridge's windows if necessary */
	pnv_pci_fixup_bridge_resources(bus, type);

	/* The PE for root bus should be realized before any one else */
	if (!phb->ioda.root_pe_populated) {
		pe = pnv_ioda_setup_bus_PE(phb->hose->bus, false);
		if (pe) {
			phb->ioda.root_pe_idx = pe->pe_number;
			phb->ioda.root_pe_populated = true;
		}
	}

	/* Don't assign PE to PCI bus, which doesn't have subordinate devices */
	if (list_empty(&bus->devices))
		return;

	/* Reserve PEs according to used M64 resources */
	if (phb->reserve_m64_pe)
		phb->reserve_m64_pe(bus, NULL, all);

	/*
	 * Assign PE. We might run here because of partial hotplug.
	 * For the case, we just pick up the existing PE and should
	 * not allocate resources again.
	 */
	pe = pnv_ioda_setup_bus_PE(bus, all);
	if (!pe)
		return;

	pnv_ioda_setup_pe_seg(pe);
	switch (phb->type) {
	case PNV_PHB_IODA1:
		pnv_pci_ioda1_setup_dma_pe(phb, pe);
		break;
	case PNV_PHB_IODA2:
		pnv_pci_ioda2_setup_dma_pe(phb, pe);
		break;
	default:
		pr_warn("%s: No DMA for PHB#%x (type %d)\n",
			__func__, phb->hose->global_number, phb->type);
	}
}

#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
 */
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 long pnv_pci_ioda1_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;
	unsigned int idx;
	long rc;

	pe_info(pe, "Removing DMA window #%d\n", num);
	for (idx = 0; idx < phb->ioda.dma32_count; idx++) {
		if (phb->ioda.dma32_segmap[idx] != pe->pe_number)
			continue;

		rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
						idx, 0, 0ul, 0ul, 0ul);
		if (rc != OPAL_SUCCESS) {
			pe_warn(pe, "Failure %ld unmapping DMA32 segment#%d\n",
				rc, idx);
			return rc;
		}

		phb->ioda.dma32_segmap[idx] = IODA_INVALID_PE;
	}

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

static void pnv_pci_ioda1_release_pe_dma(struct pnv_ioda_pe *pe)
{
	unsigned int weight = pnv_pci_ioda_pe_dma_weight(pe);
	struct iommu_table *tbl = pe->table_group.tables[0];
	int64_t rc;

	if (!weight)
		return;

	rc = pnv_pci_ioda1_unset_window(&pe->table_group, 0);
	if (rc != OPAL_SUCCESS)
		return;

	pnv_pci_p7ioc_tce_invalidate(tbl, tbl->it_offset, tbl->it_size, false);
	if (pe->table_group.group) {
		iommu_group_put(pe->table_group.group);
		WARN_ON(pe->table_group.group);
	}

	free_pages(tbl->it_base, get_order(tbl->it_size << 3));
	iommu_free_table(tbl, "pnv");
}

static void pnv_pci_ioda2_release_pe_dma(struct pnv_ioda_pe *pe)
{
	struct iommu_table *tbl = pe->table_group.tables[0];
	unsigned int weight = pnv_pci_ioda_pe_dma_weight(pe);
#ifdef CONFIG_IOMMU_API
	int64_t rc;
#endif

	if (!weight)
		return;

#ifdef CONFIG_IOMMU_API
	rc = pnv_pci_ioda2_unset_window(&pe->table_group, 0);
	if (rc)
		pe_warn(pe, "OPAL error %ld release DMA window\n", rc);
#endif

	pnv_pci_ioda2_set_bypass(pe, false);
	if (pe->table_group.group) {
		iommu_group_put(pe->table_group.group);
		WARN_ON(pe->table_group.group);
	}

	pnv_pci_ioda2_table_free_pages(tbl);
	iommu_free_table(tbl, "pnv");
}

static void pnv_ioda_free_pe_seg(struct pnv_ioda_pe *pe,
				 unsigned short win,
				 unsigned int *map)
{
	struct pnv_phb *phb = pe->phb;
	int idx;
	int64_t rc;

	for (idx = 0; idx < phb->ioda.total_pe_num; idx++) {
		if (map[idx] != pe->pe_number)
			continue;

		if (win == OPAL_M64_WINDOW_TYPE)
			rc = opal_pci_map_pe_mmio_window(phb->opal_id,
					phb->ioda.reserved_pe_idx, win,
					idx / PNV_IODA1_M64_SEGS,
					idx % PNV_IODA1_M64_SEGS);
		else
			rc = opal_pci_map_pe_mmio_window(phb->opal_id,
					phb->ioda.reserved_pe_idx, win, 0, idx);

		if (rc != OPAL_SUCCESS)
			pe_warn(pe, "Error %ld unmapping (%d) segment#%d\n",
				rc, win, idx);

		map[idx] = IODA_INVALID_PE;
	}
}

static void pnv_ioda_release_pe_seg(struct pnv_ioda_pe *pe)
{
	struct pnv_phb *phb = pe->phb;

	if (phb->type == PNV_PHB_IODA1) {
		pnv_ioda_free_pe_seg(pe, OPAL_IO_WINDOW_TYPE,
				     phb->ioda.io_segmap);
		pnv_ioda_free_pe_seg(pe, OPAL_M32_WINDOW_TYPE,
				     phb->ioda.m32_segmap);
		pnv_ioda_free_pe_seg(pe, OPAL_M64_WINDOW_TYPE,
				     phb->ioda.m64_segmap);
	} else if (phb->type == PNV_PHB_IODA2) {
		pnv_ioda_free_pe_seg(pe, OPAL_M32_WINDOW_TYPE,
				     phb->ioda.m32_segmap);
	}
}

static void pnv_ioda_release_pe(struct pnv_ioda_pe *pe)
{
	struct pnv_phb *phb = pe->phb;
	struct pnv_ioda_pe *slave, *tmp;

	list_del(&pe->list);
	switch (phb->type) {
	case PNV_PHB_IODA1:
		pnv_pci_ioda1_release_pe_dma(pe);
		break;
	case PNV_PHB_IODA2:
		pnv_pci_ioda2_release_pe_dma(pe);
		break;
	default:
		WARN_ON(1);
	}

	pnv_ioda_release_pe_seg(pe);
	pnv_ioda_deconfigure_pe(pe->phb, pe);

	/* Release slave PEs in the compound PE */
	if (pe->flags & PNV_IODA_PE_MASTER) {
		list_for_each_entry_safe(slave, tmp, &pe->slaves, list) {
			list_del(&slave->list);
			pnv_ioda_free_pe(slave);
		}
	}

	/*
	 * The PE for root bus can be removed because of hotplug in EEH
	 * recovery for fenced PHB error. We need to mark the PE dead so
	 * that it can be populated again in PCI hot add path. The PE
	 * shouldn't be destroyed as it's the global reserved resource.
	 */
	if (phb->ioda.root_pe_populated &&
	    phb->ioda.root_pe_idx == pe->pe_number)
		phb->ioda.root_pe_populated = false;
	else
		pnv_ioda_free_pe(pe);
}

static void pnv_pci_release_device(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;

	if (pdev->is_virtfn)
		return;

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

	/*
	 * PCI hotplug can happen as part of EEH error recovery. The @pdn
	 * isn't removed and added afterwards in this scenario. We should
	 * set the PE number in @pdn to an invalid one. Otherwise, the PE's
	 * device count is decreased on removing devices while failing to
	 * be increased on adding devices. It leads to unbalanced PE's device
	 * count and eventually make normal PCI hotplug path broken.
	 */
	pe = &phb->ioda.pe_array[pdn->pe_number];
	pdn->pe_number = IODA_INVALID_PE;

	WARN_ON(--pe->device_count < 0);
	if (pe->device_count == 0)
		pnv_ioda_release_pe(pe);
}

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,
	.dma_bus_setup		= pnv_pci_dma_bus_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,
	.release_device		= pnv_pci_release_device,
	.window_alignment	= pnv_pci_window_alignment,
	.setup_bridge		= pnv_pci_setup_bridge,
	.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 int pnv_npu_dma_set_mask(struct pci_dev *npdev, u64 dma_mask)
{
	dev_err_once(&npdev->dev,
			"%s operation unsupported for NVLink devices\n",
			__func__);
	return -EPERM;
}

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,
};

#ifdef CONFIG_CXL_BASE
const struct pci_controller_ops pnv_cxl_cx4_ioda_controller_ops = {
	.dma_dev_setup		= pnv_pci_dma_dev_setup,
	.dma_bus_setup		= pnv_pci_dma_bus_setup,
#ifdef CONFIG_PCI_MSI
	.setup_msi_irqs		= pnv_cxl_cx4_setup_msi_irqs,
	.teardown_msi_irqs	= pnv_cxl_cx4_teardown_msi_irqs,
#endif
	.enable_device_hook	= pnv_cxl_enable_device_hook,
	.disable_device		= pnv_cxl_disable_device,
	.release_device		= pnv_pci_release_device,
	.window_alignment	= pnv_pci_window_alignment,
	.setup_bridge		= pnv_pci_setup_bridge,
	.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,
};
#endif

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, m64map_off, m32map_off, pemap_off;
	unsigned long iomap_off = 0, dma32map_off = 0;
	struct resource r;
	const __be64 *prop64;
	const __be32 *prop32;
	int len;
	unsigned int segno;
	u64 phb_id;
	void *aux;
	long rc;

	if (!of_device_is_available(np))
		return;

	pr_info("Initializing %s PHB (%s)\n",
		pnv_phb_names[ioda_type], of_node_full_name(np));

	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 */
	if (!of_address_to_resource(np, 0, &r)) {
		phb->regs_phys = r.start;
		phb->regs = ioremap(r.start, resource_size(&r));
		if (phb->regs == NULL)
			pr_err("  Failed to map registers !\n");
	}

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

	/* Invalidate RID to PE# mapping */
	for (segno = 0; segno < ARRAY_SIZE(phb->ioda.pe_rmap); segno++)
		phb->ioda.pe_rmap[segno] = IODA_INVALID_PE;

	/* 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_num;
	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_num;
	phb->ioda.io_pci_base = 0; /* XXX calculate this ? */

	/* Calculate how many 32-bit TCE segments we have */
	phb->ioda.dma32_count = phb->ioda.m32_pci_base /
				PNV_IODA1_DMA32_SEGSIZE;

	/* Allocate aux data & arrays. We don't have IO ports on PHB3 */
	size = _ALIGN_UP(max_t(unsigned, phb->ioda.total_pe_num, 8) / 8,
			sizeof(unsigned long));
	m64map_off = size;
	size += phb->ioda.total_pe_num * sizeof(phb->ioda.m64_segmap[0]);
	m32map_off = size;
	size += phb->ioda.total_pe_num * sizeof(phb->ioda.m32_segmap[0]);
	if (phb->type == PNV_PHB_IODA1) {
		iomap_off = size;
		size += phb->ioda.total_pe_num * sizeof(phb->ioda.io_segmap[0]);
		dma32map_off = size;
		size += phb->ioda.dma32_count *
			sizeof(phb->ioda.dma32_segmap[0]);
	}
	pemap_off = size;
	size += phb->ioda.total_pe_num * sizeof(struct pnv_ioda_pe);
	aux = memblock_virt_alloc(size, 0);
	phb->ioda.pe_alloc = aux;
	phb->ioda.m64_segmap = aux + m64map_off;
	phb->ioda.m32_segmap = aux + m32map_off;
	for (segno = 0; segno < phb->ioda.total_pe_num; segno++) {
		phb->ioda.m64_segmap[segno] = IODA_INVALID_PE;
		phb->ioda.m32_segmap[segno] = IODA_INVALID_PE;
	}
	if (phb->type == PNV_PHB_IODA1) {
		phb->ioda.io_segmap = aux + iomap_off;
		for (segno = 0; segno < phb->ioda.total_pe_num; segno++)
			phb->ioda.io_segmap[segno] = IODA_INVALID_PE;

		phb->ioda.dma32_segmap = aux + dma32map_off;
		for (segno = 0; segno < phb->ioda.dma32_count; segno++)
			phb->ioda.dma32_segmap[segno] = IODA_INVALID_PE;
	}
	phb->ioda.pe_array = aux + pemap_off;

	/*
	 * Choose PE number for root bus, which shouldn't have
	 * M64 resources consumed by its child devices. To pick
	 * the PE number adjacent to the reserved one if possible.
	 */
	pnv_ioda_reserve_pe(phb, phb->ioda.reserved_pe_idx);
	if (phb->ioda.reserved_pe_idx == 0) {
		phb->ioda.root_pe_idx = 1;
		pnv_ioda_reserve_pe(phb, phb->ioda.root_pe_idx);
	} else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1)) {
		phb->ioda.root_pe_idx = phb->ioda.reserved_pe_idx - 1;
		pnv_ioda_reserve_pe(phb, phb->ioda.root_pe_idx);
	} else {
		phb->ioda.root_pe_idx = IODA_INVALID_PE;
	}

	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.dma32_count = phb->ioda.m32_pci_base /
				PNV_IODA1_DMA32_SEGSIZE;

#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_num, phb->ioda.reserved_pe_idx,
		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 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 {
		phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;
		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 kernel, the previous kernel 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 kernel.
	 */
	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);
	}
}