xref: /openbmc/linux/arch/powerpc/platforms/powernv/pci-ioda.c (revision 4b82ab18)

/*
 * Support PCI/PCIe on PowerNV platforms
 *
 * Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#undef DEBUG

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

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

#include <misc/cxl.h>

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

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

	va_start(args, fmt);

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

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

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

	va_end(args);
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;

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

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

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

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

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

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

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

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

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

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

	if (all)
		goto done;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

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

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

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

	return state;
}

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

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

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

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

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

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

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

	rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number,
				pe->pe_number, OPAL_ADD_PE_TO_DOMAIN);
	if (rc)
		pe_warn(pe, "OPAL error %d adding self to PELTV\n", rc);
	opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
				  OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);

	/* Add to 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_ADD_PE_TO_DOMAIN);
			/* XXX What to do in case of error ? */
		}
		parent = parent->bus->self;
	}
	/* 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 = pe->pe_number;
		rc = opal_pci_set_mve(phb->opal_id, pe->mve_number,
				      pe->pe_number);
		if (rc) {
			pe_err(pe, "OPAL error %ld setting up MVE %d\n",
			       rc, pe->mve_number);
			pe->mve_number = -1;
		} else {
			rc = opal_pci_set_mve_enable(phb->opal_id,
						     pe->mve_number, OPAL_ENABLE_MVE);
			if (rc) {
				pe_err(pe, "OPAL error %ld enabling MVE %d\n",
				       rc, pe->mve_number);
				pe->mve_number = -1;
			}
		}
	} else if (phb->type == PNV_PHB_IODA2)
		pe->mve_number = 0;

	return 0;
}

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

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

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

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

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

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

	/* Default */
	return 10;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	pnv_ioda_setup_bus_PE(bus, 0);

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

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

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

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

		pnv_ioda_setup_PEs(hose->bus);
	}
}

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

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

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

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

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

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

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

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

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

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


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

	return mask;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	icp_native_eoi(d);
}


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

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

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

#ifdef CONFIG_CXL_BASE

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

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

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

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

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

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

	return rc;
}
EXPORT_SYMBOL(pnv_phb_to_cxl);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;
}
EXPORT_SYMBOL(pnv_cxl_ioda_msi_setup);
#endif

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

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

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

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

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

	if (is_64) {
		__be64 addr64;

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

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

	set_msi_irq_chip(phb, virq);

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	pnv_pci_ioda_create_dbgfs();

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

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

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

		bridge = bridge->bus->self;
	}

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

	return phb->ioda.io_segsize;
}

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

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

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

	return 0;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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

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

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

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

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

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

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

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

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

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

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

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

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

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