pci-ioda.c

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

#undef DEBUG

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/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 <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 "powernv.h"
#include "pci.h"

#define define_pe_printk_level(func, kern_level)		\
static int func(const struct pnv_ioda_pe *pe, const char *fmt, ...)	\
{								\
	struct va_format vaf;					\
	va_list args;						\
	char pfix[32];						\
	int r;							\
								\
	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);			\
	r = printk(kern_level "pci %s: [PE# %.3d] %pV",		\
		   pfix, pe->pe_number, &vaf);			\
								\
	va_end(args);						\
								\
	return r;						\
}								\

define_pe_printk_level(pe_err, KERN_ERR);
define_pe_printk_level(pe_warn, KERN_WARNING);
define_pe_printk_level(pe_info, KERN_INFO);

static struct pci_dn *pnv_ioda_get_pdn(struct pci_dev *dev)
{
	struct device_node *np;

	np = pci_device_to_OF_node(dev);
	if (!np)
		return NULL;
	return PCI_DN(np);
}

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);
}

/* 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 = pnv_ioda_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 */
	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;
	}
	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 = pnv_ioda_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 = pnv_ioda_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 = pnv_ioda_get_pdn(dev);

		if (pdn == NULL) {
			pr_warn("%s: No device node associated with device !\n",
				pci_name(dev));
			continue;
		}
		pci_dev_get(dev);
		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;

	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;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		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 = pnv_ioda_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];
	set_iommu_table_base(&pdev->dev, &pe->tce32_table);
}

static void pnv_pci_ioda1_tce_invalidate(struct iommu_table *tbl,
					 u64 *startp, u64 *endp)
{
	u64 __iomem *invalidate = (u64 __iomem *)tbl->it_index;
	unsigned long start, end, inc;

	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 <<= 12;
		end <<= 12;
		inc = 128 << 12;
		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) {
                __raw_writeq(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,
					 u64 *startp, u64 *endp)
{
	unsigned long start, end, inc;
	u64 __iomem *invalidate = (u64 __iomem *)tbl->it_index;

	/* We'll invalidate DMA address in PE scope */
	start = 0x2ul << 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 << 12);
	inc = tbl->it_offset + (((u64)endp - tbl->it_base) / sizeof(u64));
	end |= (inc << 12);
	inc = (0x1ul << 12);
	mb();

	while (start <= end) {
		__raw_writeq(start, invalidate);
		start += inc;
	}
}

void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
				 u64 *startp, u64 *endp)
{
	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(tbl, startp, endp);
	else
		pnv_pci_ioda2_tce_invalidate(pe, tbl, startp, endp);
}

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);

	/* 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.
		 */
		tbl->it_busno = 0;
		tbl->it_index = (unsigned long)ioremap(be64_to_cpup(swinvp), 8);
		tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE |
			       TCE_PCI_SWINV_PAIR;
	}
	iommu_init_table(tbl, phb->hose->node);

	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_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);

	/* 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.
		 */
		tbl->it_busno = 0;
		tbl->it_index = (unsigned long)ioremap(be64_to_cpup(swinvp), 8);
		tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
	}
	iommu_init_table(tbl, phb->hose->node);

	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 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 irq_data *idata;
	struct irq_chip *ichip;
	unsigned int xive_num = hwirq - phb->msi_base;
	uint64_t addr64;
	uint32_t addr32, 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;

	/* 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) {
		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 = addr64 >> 32;
		msg->address_lo = addr64 & 0xfffffffful;
	} else {
		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 = addr32;
	}
	msg->data = data;

	/*
	 * Change the IRQ chip for the MSI interrupts on PHB3.
	 * The corresponding IRQ chip should be populated for
	 * the first time.
	 */
	if (phb->type == PNV_PHB_IODA2) {
		if (!phb->ioda.irq_chip_init) {
			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);
	}

	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) {
			/* WARNING: Assumes M32 is mem region 0 in PHB. We need to
			 * harden that algorithm when we start supporting M64
			 */
			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_fixup(void)
{
	pnv_pci_ioda_setup_PEs();
	pnv_pci_ioda_setup_seg();
	pnv_pci_ioda_setup_DMA();
}

/*
 * 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 need support prefetchable memory window later */
	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 = pnv_ioda_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_PCI_IODA_TABLE_RESET,
		       OPAL_ASSERT_RESET);
}

void __init pnv_pci_init_ioda_phb(struct device_node *np, int ioda_type)
{
	struct pci_controller *hose;
	static int primary = 1;
	struct pnv_phb *phb;
	unsigned long size, m32map_off, iomap_off, pemap_off;
	const u64 *prop64;
	const u32 *prop32;
	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) {
		memset(phb, 0, sizeof(struct pnv_phb));
		phb->hose = hose = pcibios_alloc_controller(np);
	}
	if (!phb || !phb->hose) {
		pr_err("PCI: Failed to allocate PCI controller for %s\n",
		       np->full_name);
		return;
	}

	spin_lock_init(&phb->lock);
	/* XXX Use device-tree */
	hose->first_busno = 0;
	hose->last_busno = 0xff;
	hose->private_data = phb;
	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(phb->hose, np, primary);
	primary = 0;

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

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

	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
	 *
	 * XXX TODO: Don't allocate io segmap 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]);
	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;
	phb->ioda.io_segmap = aux + iomap_off;
	phb->ioda.pe_array = aux + pemap_off;
	set_bit(0, 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;

	/* Clear unusable m64 */
	hose->mem_resources[1].flags = 0;
	hose->mem_resources[1].start = 0;
	hose->mem_resources[1].end = 0;
	hose->mem_resources[2].flags = 0;
	hose->mem_resources[2].start = 0;
	hose->mem_resources[2].end = 0;

#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("  %d PE's M32: 0x%x [segment=0x%x] IO: 0x%x [segment=0x%x]\n",
		phb->ioda.total_pe,
		phb->ioda.m32_size, phb->ioda.m32_segsize,
		phb->ioda.io_size, phb->ioda.io_segsize);

	phb->hose->ops = &pnv_pci_ops;

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

	/* Setup TCEs */
	phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;

	/* Setup 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;
	pci_add_flags(PCI_REASSIGN_ALL_RSRC);

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

	/*
	 * On IODA1 map everything to PE#0, on IODA2 we assume the IODA reset
	 * has cleared the RTT which has the same effect
	 */
	if (ioda_type == PNV_PHB_IODA1)
		opal_pci_set_pe(phb_id, 0, 0, 7, 1, 1 , OPAL_MAP_PE);
}

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

void __init pnv_pci_init_ioda_hub(struct device_node *np)
{
	struct device_node *phbn;
	const u64 *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, PNV_PHB_IODA1);
	}
}