blob: 85cbc96eff6cbd60e3e6bb9bf126091181eb5ef1 [file] [log] [blame]
/*
* Support PCI/PCIe on PowerNV platforms
*
* Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/crash_dump.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/msi.h>
#include <linux/memblock.h>
#include <linux/iommu.h>
#include <linux/rculist.h>
#include <linux/sizes.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/msi_bitmap.h>
#include <asm/ppc-pci.h>
#include <asm/opal.h>
#include <asm/iommu.h>
#include <asm/tce.h>
#include <asm/xics.h>
#include <asm/debug.h>
#include <asm/firmware.h>
#include <asm/pnv-pci.h>
#include <asm/mmzone.h>
#include <misc/cxl-base.h>
#include "powernv.h"
#include "pci.h"
/* 256M DMA window, 4K TCE pages, 8 bytes TCE */
#define TCE32_TABLE_SIZE ((0x10000000 / 0x1000) * 8)
#define POWERNV_IOMMU_DEFAULT_LEVELS 1
#define POWERNV_IOMMU_MAX_LEVELS 5
static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl);
static void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level,
const char *fmt, ...)
{
struct va_format vaf;
va_list args;
char pfix[32];
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
if (pe->flags & PNV_IODA_PE_DEV)
strlcpy(pfix, dev_name(&pe->pdev->dev), sizeof(pfix));
else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
sprintf(pfix, "%04x:%02x ",
pci_domain_nr(pe->pbus), pe->pbus->number);
#ifdef CONFIG_PCI_IOV
else if (pe->flags & PNV_IODA_PE_VF)
sprintf(pfix, "%04x:%02x:%2x.%d",
pci_domain_nr(pe->parent_dev->bus),
(pe->rid & 0xff00) >> 8,
PCI_SLOT(pe->rid), PCI_FUNC(pe->rid));
#endif /* CONFIG_PCI_IOV*/
printk("%spci %s: [PE# %.3d] %pV",
level, pfix, pe->pe_number, &vaf);
va_end(args);
}
#define pe_err(pe, fmt, ...) \
pe_level_printk(pe, KERN_ERR, fmt, ##__VA_ARGS__)
#define pe_warn(pe, fmt, ...) \
pe_level_printk(pe, KERN_WARNING, fmt, ##__VA_ARGS__)
#define pe_info(pe, fmt, ...) \
pe_level_printk(pe, KERN_INFO, fmt, ##__VA_ARGS__)
static bool pnv_iommu_bypass_disabled __read_mostly;
static int __init iommu_setup(char *str)
{
if (!str)
return -EINVAL;
while (*str) {
if (!strncmp(str, "nobypass", 8)) {
pnv_iommu_bypass_disabled = true;
pr_info("PowerNV: IOMMU bypass window disabled.\n");
break;
}
str += strcspn(str, ",");
if (*str == ',')
str++;
}
return 0;
}
early_param("iommu", iommu_setup);
/*
* 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;
pr_info(" MEM64 0x%016llx..0x%016llx -> 0x%016llx\n",
res->start, res->end, pci_addr);
/* Use last M64 BAR to cover M64 window */
phb->ioda.m64_bar_idx = 15;
phb->init_m64 = pnv_ioda2_init_m64;
phb->reserve_m64_pe = pnv_ioda2_reserve_m64_pe;
phb->pick_m64_pe = pnv_ioda2_pick_m64_pe;
}
static void pnv_ioda_freeze_pe(struct pnv_phb *phb, int pe_no)
{
struct pnv_ioda_pe *pe = &phb->ioda.pe_array[pe_no];
struct pnv_ioda_pe *slave;
s64 rc;
/* Fetch master PE */
if (pe->flags & PNV_IODA_PE_SLAVE) {
pe = pe->master;
if (WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER)))
return;
pe_no = pe->pe_number;
}
/* Freeze master PE */
rc = opal_pci_eeh_freeze_set(phb->opal_id,
pe_no,
OPAL_EEH_ACTION_SET_FREEZE_ALL);
if (rc != OPAL_SUCCESS) {
pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n",
__func__, rc, phb->hose->global_number, pe_no);
return;
}
/* Freeze slave PEs */
if (!(pe->flags & PNV_IODA_PE_MASTER))
return;
list_for_each_entry(slave, &pe->slaves, list) {
rc = opal_pci_eeh_freeze_set(phb->opal_id,
slave->pe_number,
OPAL_EEH_ACTION_SET_FREEZE_ALL);
if (rc != OPAL_SUCCESS)
pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n",
__func__, rc, phb->hose->global_number,
slave->pe_number);
}
}
static int pnv_ioda_unfreeze_pe(struct pnv_phb *phb, int pe_no, int opt)
{
struct pnv_ioda_pe *pe, *slave;
s64 rc;
/* Find master PE */
pe = &phb->ioda.pe_array[pe_no];
if (pe->flags & PNV_IODA_PE_SLAVE) {
pe = pe->master;
WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
pe_no = pe->pe_number;
}
/* Clear frozen state for master PE */
rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no, opt);
if (rc != OPAL_SUCCESS) {
pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n",
__func__, rc, opt, phb->hose->global_number, pe_no);
return -EIO;
}
if (!(pe->flags & PNV_IODA_PE_MASTER))
return 0;
/* Clear frozen state for slave PEs */
list_for_each_entry(slave, &pe->slaves, list) {
rc = opal_pci_eeh_freeze_clear(phb->opal_id,
slave->pe_number,
opt);
if (rc != OPAL_SUCCESS) {
pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n",
__func__, rc, opt, phb->hose->global_number,
slave->pe_number);
return -EIO;
}
}
return 0;
}
static int pnv_ioda_get_pe_state(struct pnv_phb *phb, int pe_no)
{
struct pnv_ioda_pe *slave, *pe;
u8 fstate, state;
__be16 pcierr;
s64 rc;
/* Sanity check on PE number */
if (pe_no < 0 || pe_no >= phb->ioda.total_pe)
return OPAL_EEH_STOPPED_PERM_UNAVAIL;
/*
* Fetch the master PE and the PE instance might be
* not initialized yet.
*/
pe = &phb->ioda.pe_array[pe_no];
if (pe->flags & PNV_IODA_PE_SLAVE) {
pe = pe->master;
WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
pe_no = pe->pe_number;
}
/* Check the master PE */
rc = opal_pci_eeh_freeze_status(phb->opal_id, pe_no,
&state, &pcierr, NULL);
if (rc != OPAL_SUCCESS) {
pr_warn("%s: Failure %lld getting "
"PHB#%x-PE#%x state\n",
__func__, rc,
phb->hose->global_number, pe_no);
return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
}
/* Check the slave PE */
if (!(pe->flags & PNV_IODA_PE_MASTER))
return state;
list_for_each_entry(slave, &pe->slaves, list) {
rc = opal_pci_eeh_freeze_status(phb->opal_id,
slave->pe_number,
&fstate,
&pcierr,
NULL);
if (rc != OPAL_SUCCESS) {
pr_warn("%s: Failure %lld getting "
"PHB#%x-PE#%x state\n",
__func__, rc,
phb->hose->global_number, slave->pe_number);
return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
}
/*
* Override the result based on the ascending
* priority.
*/
if (fstate > state)
state = fstate;
}
return state;
}
/* Currently those 2 are only used when MSIs are enabled, this will change
* but in the meantime, we need to protect them to avoid warnings
*/
#ifdef CONFIG_PCI_MSI
static struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
struct pci_dn *pdn = pci_get_pdn(dev);
if (!pdn)
return NULL;
if (pdn->pe_number == IODA_INVALID_PE)
return NULL;
return &phb->ioda.pe_array[pdn->pe_number];
}
#endif /* CONFIG_PCI_MSI */
static int pnv_ioda_set_one_peltv(struct pnv_phb *phb,
struct pnv_ioda_pe *parent,
struct pnv_ioda_pe *child,
bool is_add)
{
const char *desc = is_add ? "adding" : "removing";
uint8_t op = is_add ? OPAL_ADD_PE_TO_DOMAIN :
OPAL_REMOVE_PE_FROM_DOMAIN;
struct pnv_ioda_pe *slave;
long rc;
/* Parent PE affects child PE */
rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number,
child->pe_number, op);
if (rc != OPAL_SUCCESS) {
pe_warn(child, "OPAL error %ld %s to parent PELTV\n",
rc, desc);
return -ENXIO;
}
if (!(child->flags & PNV_IODA_PE_MASTER))
return 0;
/* Compound case: parent PE affects slave PEs */
list_for_each_entry(slave, &child->slaves, list) {
rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number,
slave->pe_number, op);
if (rc != OPAL_SUCCESS) {
pe_warn(slave, "OPAL error %ld %s to parent PELTV\n",
rc, desc);
return -ENXIO;
}
}
return 0;
}
static int pnv_ioda_set_peltv(struct pnv_phb *phb,
struct pnv_ioda_pe *pe,
bool is_add)
{
struct pnv_ioda_pe *slave;
struct pci_dev *pdev = NULL;
int ret;
/*
* Clear PE frozen state. If it's master PE, we need
* clear slave PE frozen state as well.
*/
if (is_add) {
opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
if (pe->flags & PNV_IODA_PE_MASTER) {
list_for_each_entry(slave, &pe->slaves, list)
opal_pci_eeh_freeze_clear(phb->opal_id,
slave->pe_number,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
}
}
/*
* Associate PE in PELT. We need add the PE into the
* corresponding PELT-V as well. Otherwise, the error
* originated from the PE might contribute to other
* PEs.
*/
ret = pnv_ioda_set_one_peltv(phb, pe, pe, is_add);
if (ret)
return ret;
/* For compound PEs, any one affects all of them */
if (pe->flags & PNV_IODA_PE_MASTER) {
list_for_each_entry(slave, &pe->slaves, list) {
ret = pnv_ioda_set_one_peltv(phb, slave, pe, is_add);
if (ret)
return ret;
}
}
if (pe->flags & (PNV_IODA_PE_BUS_ALL | PNV_IODA_PE_BUS))
pdev = pe->pbus->self;
else if (pe->flags & PNV_IODA_PE_DEV)
pdev = pe->pdev->bus->self;
#ifdef CONFIG_PCI_IOV
else if (pe->flags & PNV_IODA_PE_VF)
pdev = pe->parent_dev->bus->self;
#endif /* CONFIG_PCI_IOV */
while (pdev) {
struct pci_dn *pdn = pci_get_pdn(pdev);
struct pnv_ioda_pe *parent;
if (pdn && pdn->pe_number != IODA_INVALID_PE) {
parent = &phb->ioda.pe_array[pdn->pe_number];
ret = pnv_ioda_set_one_peltv(phb, parent, pe, is_add);
if (ret)
return ret;
}
pdev = pdev->bus->self;
}
return 0;
}
#ifdef CONFIG_PCI_IOV
static int pnv_ioda_deconfigure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
{
struct pci_dev *parent;
uint8_t bcomp, dcomp, fcomp;
int64_t rc;
long rid_end, rid;
/* Currently, we just deconfigure VF PE. Bus PE will always there.*/
if (pe->pbus) {
int count;
dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER;
fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER;
parent = pe->pbus->self;
if (pe->flags & PNV_IODA_PE_BUS_ALL)
count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1;
else
count = 1;
switch(count) {
case 1: bcomp = OpalPciBusAll; break;
case 2: bcomp = OpalPciBus7Bits; break;
case 4: bcomp = OpalPciBus6Bits; break;
case 8: bcomp = OpalPciBus5Bits; break;
case 16: bcomp = OpalPciBus4Bits; break;
case 32: bcomp = OpalPciBus3Bits; break;
default:
dev_err(&pe->pbus->dev, "Number of subordinate buses %d unsupported\n",
count);
/* Do an exact match only */
bcomp = OpalPciBusAll;
}
rid_end = pe->rid + (count << 8);
} else {
if (pe->flags & PNV_IODA_PE_VF)
parent = pe->parent_dev;
else
parent = pe->pdev->bus->self;
bcomp = OpalPciBusAll;
dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
rid_end = pe->rid + 1;
}
/* Clear the reverse map */
for (rid = pe->rid; rid < rid_end; rid++)
phb->ioda.pe_rmap[rid] = 0;
/* Release from all parents PELT-V */
while (parent) {
struct pci_dn *pdn = pci_get_pdn(parent);
if (pdn && pdn->pe_number != IODA_INVALID_PE) {
rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number,
pe->pe_number, OPAL_REMOVE_PE_FROM_DOMAIN);
/* XXX What to do in case of error ? */
}
parent = parent->bus->self;
}
opal_pci_eeh_freeze_set(phb->opal_id, pe->pe_number,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
/* Disassociate PE in PELT */
rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number,
pe->pe_number, OPAL_REMOVE_PE_FROM_DOMAIN);
if (rc)
pe_warn(pe, "OPAL error %ld remove self from PELTV\n", rc);
rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
bcomp, dcomp, fcomp, OPAL_UNMAP_PE);
if (rc)
pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc);
pe->pbus = NULL;
pe->pdev = NULL;
pe->parent_dev = NULL;
return 0;
}
#endif /* CONFIG_PCI_IOV */
static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
{
struct pci_dev *parent;
uint8_t bcomp, dcomp, fcomp;
long rc, rid_end, rid;
/* Bus validation ? */
if (pe->pbus) {
int count;
dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER;
fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER;
parent = pe->pbus->self;
if (pe->flags & PNV_IODA_PE_BUS_ALL)
count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1;
else
count = 1;
switch(count) {
case 1: bcomp = OpalPciBusAll; break;
case 2: bcomp = OpalPciBus7Bits; break;
case 4: bcomp = OpalPciBus6Bits; break;
case 8: bcomp = OpalPciBus5Bits; break;
case 16: bcomp = OpalPciBus4Bits; break;
case 32: bcomp = OpalPciBus3Bits; break;
default:
dev_err(&pe->pbus->dev, "Number of subordinate buses %d unsupported\n",
count);
/* Do an exact match only */
bcomp = OpalPciBusAll;
}
rid_end = pe->rid + (count << 8);
} else {
#ifdef CONFIG_PCI_IOV
if (pe->flags & PNV_IODA_PE_VF)
parent = pe->parent_dev;
else
#endif /* CONFIG_PCI_IOV */
parent = pe->pdev->bus->self;
bcomp = OpalPciBusAll;
dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
rid_end = pe->rid + 1;
}
/*
* Associate PE in PELT. We need add the PE into the
* corresponding PELT-V as well. Otherwise, the error
* originated from the PE might contribute to other
* PEs.
*/
rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
bcomp, dcomp, fcomp, OPAL_MAP_PE);
if (rc) {
pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc);
return -ENXIO;
}
/* Configure PELTV */
pnv_ioda_set_peltv(phb, pe, true);
/* Setup reverse map */
for (rid = pe->rid; rid < rid_end; rid++)
phb->ioda.pe_rmap[rid] = pe->pe_number;
/* Setup one MVTs on IODA1 */
if (phb->type != PNV_PHB_IODA1) {
pe->mve_number = 0;
goto out;
}
pe->mve_number = pe->pe_number;
rc = opal_pci_set_mve(phb->opal_id, pe->mve_number, pe->pe_number);
if (rc != OPAL_SUCCESS) {
pe_err(pe, "OPAL error %ld setting up MVE %d\n",
rc, pe->mve_number);
pe->mve_number = -1;
} else {
rc = opal_pci_set_mve_enable(phb->opal_id,
pe->mve_number, OPAL_ENABLE_MVE);
if (rc) {
pe_err(pe, "OPAL error %ld enabling MVE %d\n",
rc, pe->mve_number);
pe->mve_number = -1;
}
}
out:
return 0;
}
static void pnv_ioda_link_pe_by_weight(struct pnv_phb *phb,
struct pnv_ioda_pe *pe)
{
struct pnv_ioda_pe *lpe;
list_for_each_entry(lpe, &phb->ioda.pe_dma_list, dma_link) {
if (lpe->dma_weight < pe->dma_weight) {
list_add_tail(&pe->dma_link, &lpe->dma_link);
return;
}
}
list_add_tail(&pe->dma_link, &phb->ioda.pe_dma_list);
}
static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev)
{
/* This is quite simplistic. The "base" weight of a device
* is 10. 0 means no DMA is to be accounted for it.
*/
/* If it's a bridge, no DMA */
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
return 0;
/* Reduce the weight of slow USB controllers */
if (dev->class == PCI_CLASS_SERIAL_USB_UHCI ||
dev->class == PCI_CLASS_SERIAL_USB_OHCI ||
dev->class == PCI_CLASS_SERIAL_USB_EHCI)
return 3;
/* Increase the weight of RAID (includes Obsidian) */
if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID)
return 15;
/* Default */
return 10;
}
#ifdef CONFIG_PCI_IOV
static int pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset)
{
struct pci_dn *pdn = pci_get_pdn(dev);
int i;
struct resource *res, res2;
resource_size_t size;
u16 num_vfs;
if (!dev->is_physfn)
return -EINVAL;
/*
* "offset" is in VFs. The M64 windows are sized so that when they
* are segmented, each segment is the same size as the IOV BAR.
* Each segment is in a separate PE, and the high order bits of the
* address are the PE number. Therefore, each VF's BAR is in a
* separate PE, and changing the IOV BAR start address changes the
* range of PEs the VFs are in.
*/
num_vfs = pdn->num_vfs;
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
res = &dev->resource[i + PCI_IOV_RESOURCES];
if (!res->flags || !res->parent)
continue;
if (!pnv_pci_is_mem_pref_64(res->flags))
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;
if (!pnv_pci_is_mem_pref_64(res->flags))
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 (enabling %d VFs shifted by %d)\n",
i, &res2, res, num_vfs, offset);
pci_update_resource(dev, i + PCI_IOV_RESOURCES);
}
return 0;
}
#endif /* CONFIG_PCI_IOV */
#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->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);
}
}
#ifdef CONFIG_PCI_IOV
static int pnv_pci_vf_release_m64(struct pci_dev *pdev)
{
struct pci_bus *bus;
struct pci_controller *hose;
struct pnv_phb *phb;
struct pci_dn *pdn;
int i, j;
bus = pdev->bus;
hose = pci_bus_to_host(bus);
phb = hose->private_data;
pdn = pci_get_pdn(pdev);
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
for (j = 0; j < M64_PER_IOV; j++) {
if (pdn->m64_wins[i][j] == IODA_INVALID_M64)
continue;
opal_pci_phb_mmio_enable(phb->opal_id,
OPAL_M64_WINDOW_TYPE, pdn->m64_wins[i][j], 0);
clear_bit(pdn->m64_wins[i][j], &phb->ioda.m64_bar_alloc);
pdn->m64_wins[i][j] = IODA_INVALID_M64;
}
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 vf_groups;
int vf_per_group;
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);
/* Initialize the m64_wins to IODA_INVALID_M64 */
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
for (j = 0; j < M64_PER_IOV; j++)
pdn->m64_wins[i][j] = IODA_INVALID_M64;
if (pdn->m64_per_iov == M64_PER_IOV) {
vf_groups = (num_vfs <= M64_PER_IOV) ? num_vfs: M64_PER_IOV;
vf_per_group = (num_vfs <= M64_PER_IOV)? 1:
roundup_pow_of_two(num_vfs) / pdn->m64_per_iov;
} else {
vf_groups = 1;
vf_per_group = 1;
}
for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
res = &pdev->resource[i + PCI_IOV_RESOURCES];
if (!res->flags || !res->parent)
continue;
if (!pnv_pci_is_mem_pref_64(res->flags))
continue;
for (j = 0; j < vf_groups; 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_wins[i][j] = win;
if (pdn->m64_per_iov == M64_PER_IOV) {
size = pci_iov_resource_size(pdev,
PCI_IOV_RESOURCES + i);
size = size * vf_per_group;
start = res->start + size * j;
} else {
size = resource_size(res);
start = res->start;
}
/* Map the M64 here */
if (pdn->m64_per_iov == M64_PER_IOV) {
pe_num = pdn->offset + j;
rc = opal_pci_map_pe_mmio_window(phb->opal_id,
pe_num, OPAL_M64_WINDOW_TYPE,
pdn->m64_wins[i][j], 0);
}
rc = opal_pci_set_phb_mem_window(phb->opal_id,
OPAL_M64_WINDOW_TYPE,
pdn->m64_wins[i][j],
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_per_iov == M64_PER_IOV)
rc = opal_pci_phb_mmio_enable(phb->opal_id,
OPAL_M64_WINDOW_TYPE, pdn->m64_wins[i][j], 2);
else
rc = opal_pci_phb_mmio_enable(phb->opal_id,
OPAL_M64_WINDOW_TYPE, pdn->m64_wins[i][j], 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);
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, u16 num_vfs)
{
struct pci_bus *bus;
struct pci_controller *hose;
struct pnv_phb *phb;
struct pnv_ioda_pe *pe, *pe_n;
struct pci_dn *pdn;
u16 vf_index;
int64_t rc;
bus = pdev->bus;
hose = pci_bus_to_host(bus);
phb = hose->private_data;
pdn = pci_get_pdn(pdev);
if (!pdev->is_physfn)
return;
if (pdn->m64_per_iov == M64_PER_IOV && num_vfs > M64_PER_IOV) {
int vf_group;
int vf_per_group;
int vf_index1;
vf_per_group = roundup_pow_of_two(num_vfs) / pdn->m64_per_iov;
for (vf_group = 0; vf_group < M64_PER_IOV; vf_group++)
for (vf_index = vf_group * vf_per_group;
vf_index < (vf_group + 1) * vf_per_group &&
vf_index < num_vfs;
vf_index++)
for (vf_index1 = vf_group * vf_per_group;
vf_index1 < (vf_group + 1) * vf_per_group &&
vf_index1 < num_vfs;
vf_index1++){
rc = opal_pci_set_peltv(phb->opal_id,
pdn->offset + vf_index,
pdn->offset + vf_index1,
OPAL_REMOVE_PE_FROM_DOMAIN);
if (rc)
dev_warn(&pdev->dev, "%s: Failed to unlink same group PE#%d(%lld)\n",
__func__,
pdn->offset + vf_index1, rc);
}
}
list_for_each_entry_safe(pe, pe_n, &phb->ioda.pe_list, list) {
if (pe->parent_dev != pdev)
continue;
pnv_pci_ioda2_release_dma_pe(pdev, pe);
/* Remove from list */
mutex_lock(&phb->ioda.pe_list_mutex);
list_del(&pe->list);
mutex_unlock(&phb->ioda.pe_list_mutex);
pnv_ioda_deconfigure_pe(phb, pe);
pnv_ioda_free_pe(phb, pe->pe_number);
}
}
void pnv_pci_sriov_disable(struct pci_dev *pdev)
{
struct pci_bus *bus;
struct pci_controller *hose;
struct pnv_phb *phb;
struct pci_dn *pdn;
struct pci_sriov *iov;
u16 num_vfs;
bus = pdev->bus;
hose = pci_bus_to_host(bus);
phb = hose->private_data;
pdn = pci_get_pdn(pdev);
iov = pdev->sriov;
num_vfs = pdn->num_vfs;
/* Release VF PEs */
pnv_ioda_release_vf_PE(pdev, num_vfs);
if (phb->type == PNV_PHB_IODA2) {
if (pdn->m64_per_iov == 1)
pnv_pci_vf_resource_shift(pdev, -pdn->offset);
/* Release M64 windows */
pnv_pci_vf_release_m64(pdev);
/* Release PE numbers */
bitmap_clear(phb->ioda.pe_alloc, pdn->offset, num_vfs);
pdn->offset = 0;
}
}
static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
struct pnv_ioda_pe *pe);
static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs)
{
struct pci_bus *bus;
struct pci_controller *hose;
struct pnv_phb *phb;
struct pnv_ioda_pe *pe;
int pe_num;
u16 vf_index;
struct pci_dn *pdn;
int64_t rc;
bus = pdev->bus;
hose = pci_bus_to_host(bus);
phb = hose->private_data;
pdn = pci_get_pdn(pdev);
if (!pdev->is_physfn)
return;
/* Reserve PE for each VF */
for (vf_index = 0; vf_index < num_vfs; vf_index++) {
pe_num = pdn->offset + vf_index;
pe = &phb->ioda.pe_array[pe_num];
pe->pe_number = pe_num;
pe->phb = phb;
pe->flags = PNV_IODA_PE_VF;
pe->pbus = NULL;
pe->parent_dev = pdev;
pe->tce32_seg = -1;
pe->mve_number = -1;
pe->rid = (pci_iov_virtfn_bus(pdev, vf_index) << 8) |
pci_iov_virtfn_devfn(pdev, vf_index);
pe_info(pe, "VF %04d:%02d:%02d.%d associated with PE#%d\n",
hose->global_number, pdev->bus->number,
PCI_SLOT(pci_iov_virtfn_devfn(pdev, vf_index)),
PCI_FUNC(pci_iov_virtfn_devfn(pdev, vf_index)), pe_num);
if (pnv_ioda_configure_pe(phb, pe)) {
/* XXX What do we do here ? */
if (pe_num)
pnv_ioda_free_pe(phb, pe_num);
pe->pdev = NULL;
continue;
}
/* Put PE to the list */
mutex_lock(&phb->ioda.pe_list_mutex);
list_add_tail(&pe->list, &phb->ioda.pe_list);
mutex_unlock(&phb->ioda.pe_list_mutex);
pnv_pci_ioda2_setup_dma_pe(phb, pe);
}
if (pdn->m64_per_iov == M64_PER_IOV && num_vfs > M64_PER_IOV) {
int vf_group;
int vf_per_group;
int vf_index1;
vf_per_group = roundup_pow_of_two(num_vfs) / pdn->m64_per_iov;
for (vf_group = 0; vf_group < M64_PER_IOV; vf_group++) {
for (vf_index = vf_group * vf_per_group;
vf_index < (vf_group + 1) * vf_per_group &&
vf_index < num_vfs;
vf_index++) {
for (vf_index1 = vf_group * vf_per_group;
vf_index1 < (vf_group + 1) * vf_per_group &&
vf_index1 < num_vfs;
vf_index1++) {
rc = opal_pci_set_peltv(phb->opal_id,
pdn->offset + vf_index,
pdn->offset + vf_index1,
OPAL_ADD_PE_TO_DOMAIN);
if (rc)
dev_warn(&pdev->dev, "%s: Failed to link same group PE#%d(%lld)\n",
__func__,
pdn->offset + vf_index1, rc);
}
}
}
}
}
int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
{
struct pci_bus *bus;
struct pci_controller *hose;
struct pnv_phb *phb;
struct pci_dn *pdn;
int ret;
bus = pdev->bus;
hose = pci_bus_to_host(bus);
phb = hose->private_data;
pdn = pci_get_pdn(pdev);
if (phb->type == PNV_PHB_IODA2) {
/* Calculate available PE for required VFs */
mutex_lock(&phb->ioda.pe_alloc_mutex);
pdn->offset = bitmap_find_next_zero_area(
phb->ioda.pe_alloc, phb->ioda.total_pe,
0, num_vfs, 0);
if (pdn->offset >= phb->ioda.total_pe) {
mutex_unlock(&phb->ioda.pe_alloc_mutex);
dev_info(&pdev->dev, "Failed to enable VF%d\n", num_vfs);
pdn->offset = 0;
return -EBUSY;
}
bitmap_set(phb->ioda.pe_alloc, pdn->offset, num_vfs);
pdn->num_vfs = num_vfs;
mutex_unlock(&phb->ioda.pe_alloc_mutex);
/* Assign M64 window accordingly */
ret = pnv_pci_vf_assign_m64(pdev, num_vfs);
if (ret) {
dev_info(&pdev->dev, "Not enough M64 window resources\n");
goto m64_failed;
}
/*
* When using one M64 BAR to map one IOV BAR, we need to shift
* the IOV BAR according to the PE# allocated to the VFs.
* Otherwise, the PE# for the VF will conflict with others.
*/
if (pdn->m64_per_iov == 1) {
ret = pnv_pci_vf_resource_shift(pdev, pdn->offset);
if (ret)
goto m64_failed;
}
}
/* Setup VF PEs */
pnv_ioda_setup_vf_PE(pdev, num_vfs);
return 0;
m64_failed:
bitmap_clear(phb->ioda.pe_alloc, pdn->offset, num_vfs);
pdn->offset = 0;
return ret;
}
int pcibios_sriov_disable(struct pci_dev *pdev)
{
pnv_pci_sriov_disable(pdev);
/* Release PCI data */
remove_dev_pci_data(pdev);
return 0;
}
int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
{
/* Allocate PCI data */
add_dev_pci_data(pdev);
pnv_pci_sriov_enable(pdev, num_vfs);
return 0;
}
#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_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);
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->table_group.tables[0]);
}
*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)
{
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
set_iommu_table_base(&dev->dev, pe->table_group.tables[0]);
iommu_add_device(&dev->dev);
if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
pnv_ioda_setup_bus_dma(pe, dev->subordinate);
}
}
static void pnv_pci_ioda1_tce_invalidate(struct iommu_table *tbl,
unsigned long index, unsigned long npages, bool rm)
{
struct iommu_table_group_link *tgl = list_first_entry_or_null(
&tbl->it_group_list, struct iommu_table_group_link,
next);
struct pnv_ioda_pe *pe = container_of(tgl->table_group,
struct pnv_ioda_pe, table_group);
__be64 __iomem *invalidate = rm ?
(__be64 __iomem *)pe->phb->ioda.tce_inval_reg_phys :
pe->phb->ioda.tce_inval_reg;
unsigned long start, end, inc;
const unsigned shift = tbl->it_page_shift;
start = __pa(((__be64 *)tbl->it_base) + index - tbl->it_offset);
end = __pa(((__be64 *)tbl->it_base) + index - tbl->it_offset +
npages - 1);
/* BML uses this case for p6/p7/galaxy2: Shift addr and put in node */
if (tbl->it_busno) {
start <<= shift;
end <<= shift;
inc = 128ull << shift;
start |= tbl->it_busno;
end |= tbl->it_busno;
} else if (tbl->it_type & TCE_PCI_SWINV_PAIR) {
/* p7ioc-style invalidation, 2 TCEs per write */
start |= (1ull << 63);
end |= (1ull << 63);
inc = 16;
} else {
/* Default (older HW) */
inc = 128;
}
end |= inc - 1; /* round up end to be different than start */
mb(); /* Ensure above stores are visible */
while (start <= end) {
if (rm)
__raw_rm_writeq(cpu_to_be64(start), invalidate);
else
__raw_writeq(cpu_to_be64(start), invalidate);
start += inc;
}
/*
* The iommu layer will do another mb() for us on build()
* and we don't care on free()
*/
}
static int pnv_ioda1_tce_build(struct iommu_table *tbl, long index,
long npages, unsigned long uaddr,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
int ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
attrs);
if (!ret && (tbl->it_type & TCE_PCI_SWINV_CREATE))
pnv_pci_ioda1_tce_invalidate(tbl, index, npages, false);
return ret;
}
#ifdef CONFIG_IOMMU_API
static int pnv_ioda1_tce_xchg(struct iommu_table *tbl, long index,
unsigned long *hpa, enum dma_data_direction *direction)
{
long ret = pnv_tce_xchg(tbl, index, hpa, direction);
if (!ret && (tbl->it_type &
(TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE)))
pnv_pci_ioda1_tce_invalidate(tbl, index, 1, false);
return ret;
}
#endif
static void pnv_ioda1_tce_free(struct iommu_table *tbl, long index,
long npages)
{
pnv_tce_free(tbl, index, npages);
if (tbl->it_type & TCE_PCI_SWINV_FREE)
pnv_pci_ioda1_tce_invalidate(tbl, index, npages, false);
}
static struct iommu_table_ops pnv_ioda1_iommu_ops = {
.set = pnv_ioda1_tce_build,
#ifdef CONFIG_IOMMU_API
.exchange = pnv_ioda1_tce_xchg,
#endif
.clear = pnv_ioda1_tce_free,
.get = pnv_tce_get,
};
static inline void pnv_pci_ioda2_tce_invalidate_entire(struct pnv_ioda_pe *pe)
{
/* 01xb - invalidate TCEs that match the specified PE# */
unsigned long val = (0x4ull << 60) | (pe->pe_number & 0xFF);
struct pnv_phb *phb = pe->phb;
if (!phb->ioda.tce_inval_reg)
return;
mb(); /* Ensure above stores are visible */
__raw_writeq(cpu_to_be64(val), phb->ioda.tce_inval_reg);
}
static void pnv_pci_ioda2_do_tce_invalidate(unsigned pe_number, bool rm,
__be64 __iomem *invalidate, unsigned shift,
unsigned long index, unsigned long npages)
{
unsigned long start, end, inc;
/* We'll invalidate DMA address in PE scope */
start = 0x2ull << 60;
start |= (pe_number & 0xFF);
end = start;
/* Figure out the start, end and step */
start |= (index << shift);
end |= ((index + npages - 1) << shift);
inc = (0x1ull << shift);
mb();
while (start <= end) {
if (rm)
__raw_rm_writeq(cpu_to_be64(start), invalidate);
else
__raw_writeq(cpu_to_be64(start), invalidate);
start += inc;
}
}
static void pnv_pci_ioda2_tce_invalidate(struct iommu_table *tbl,
unsigned long index, unsigned long npages, bool rm)
{
struct iommu_table_group_link *tgl;
list_for_each_entry_rcu(tgl, &tbl->it_group_list, next) {
struct pnv_ioda_pe *pe = container_of(tgl->table_group,
struct pnv_ioda_pe, table_group);
__be64 __iomem *invalidate = rm ?
(__be64 __iomem *)pe->phb->ioda.tce_inval_reg_phys :
pe->phb->ioda.tce_inval_reg;
pnv_pci_ioda2_do_tce_invalidate(pe->pe_number, rm,
invalidate, tbl->it_page_shift,
index, npages);
}
}
static int pnv_ioda2_tce_build(struct iommu_table *tbl, long index,
long npages, unsigned long uaddr,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
int ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
attrs);
if (!ret && (tbl->it_type & TCE_PCI_SWINV_CREATE))
pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false);
return ret;
}
#ifdef CONFIG_IOMMU_API
static int pnv_ioda2_tce_xchg(struct iommu_table *tbl, long index,
unsigned long *hpa, enum dma_data_direction *direction)
{
long ret = pnv_tce_xchg(tbl, index, hpa, direction);
if (!ret && (tbl->it_type &
(TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE)))
pnv_pci_ioda2_tce_invalidate(tbl, index, 1, false);
return ret;
}
#endif
static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index,
long npages)
{
pnv_tce_free(tbl, index, npages);
if (tbl->it_type & TCE_PCI_SWINV_FREE)
pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false);
}
static void pnv_ioda2_table_free(struct iommu_table *tbl)
{
pnv_pci_ioda2_table_free_pages(tbl);
iommu_free_table(tbl, "pnv");
}
static struct iommu_table_ops pnv_ioda2_iommu_ops = {
.set = pnv_ioda2_tce_build,
#ifdef CONFIG_IOMMU_API
.exchange = pnv_ioda2_tce_xchg,
#endif
.clear = pnv_ioda2_tce_free,
.get = pnv_tce_get,
.free = pnv_ioda2_table_free,
};
static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
struct pnv_ioda_pe *pe, unsigned int base,
unsigned int segs)
{
struct page *tce_mem = NULL;
struct iommu_table *tbl;
unsigned int i;
int64_t rc;
void *addr;
/* XXX FIXME: Handle 64-bit only DMA devices */
/* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */
/* XXX FIXME: Allocate multi-level tables on PHB3 */
/* We shouldn't already have a 32-bit DMA associated */
if (WARN_ON(pe->tce32_seg >= 0))
return;
tbl = pnv_pci_table_alloc(phb->hose->node);
iommu_register_group(&pe->table_group, phb->hose->global_number,
pe->pe_number);
pnv_pci_link_table_and_group(phb->hose->node, 0, tbl, &pe->table_group);
/* Grab a 32-bit TCE table */
pe->tce32_seg = base;
pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
(base << 28), ((base + segs) << 28) - 1);
/* XXX Currently, we allocate one big contiguous table for the
* TCEs. We only really need one chunk per 256M of TCE space
* (ie per segment) but that's an optimization for later, it
* requires some added smarts with our get/put_tce implementation
*/
tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
get_order(TCE32_TABLE_SIZE * segs));
if (!tce_mem) {
pe_err(pe, " Failed to allocate a 32-bit TCE memory\n");
goto fail;
}
addr = page_address(tce_mem);
memset(addr, 0, TCE32_TABLE_SIZE * segs);
/* Configure HW */
for (i = 0; i < segs; i++) {
rc = opal_pci_map_pe_dma_window(phb->opal_id,
pe->pe_number,
base + i, 1,
__pa(addr) + TCE32_TABLE_SIZE * i,
TCE32_TABLE_SIZE, 0x1000);
if (rc) {
pe_err(pe, " Failed to configure 32-bit TCE table,"
" err %ld\n", rc);
goto fail;
}
}
/* Setup linux iommu table */
pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
base << 28, IOMMU_PAGE_SHIFT_4K);
/* OPAL variant of P7IOC SW invalidated TCEs */
if (phb->ioda.tce_inval_reg)
tbl->it_type |= (TCE_PCI_SWINV_CREATE |
TCE_PCI_SWINV_FREE |
TCE_PCI_SWINV_PAIR);
tbl->it_ops = &pnv_ioda1_iommu_ops;
pe->table_group.tce32_start = tbl->it_offset << tbl->it_page_shift;
pe->table_group.tce32_size = tbl->it_size << tbl->it_page_shift;
iommu_init_table(tbl, phb->hose->node);
if (pe->flags & PNV_IODA_PE_DEV) {
/*
* Setting table base here only for carrying iommu_group
* further down to let iommu_add_device() do the job.
* pnv_pci_ioda_dma_dev_setup will override it later anyway.
*/
set_iommu_table_base(&pe->pdev->dev, tbl);
iommu_add_device(&pe->pdev->dev);
} else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
pnv_ioda_setup_bus_dma(pe, pe->pbus);
return;
fail:
/* XXX Failure: Try to fallback to 64-bit only ? */
if (pe->tce32_seg >= 0)
pe->tce32_seg = -1;
if (tce_mem)
__free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs));
if (tbl) {
pnv_pci_unlink_table_and_group(tbl, &pe->table_group);
iommu_free_table(tbl, "pnv");
}
}
static long pnv_pci_ioda2_set_window(struct iommu_table_group *table_group,
int num, struct iommu_table *tbl)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
table_group);
struct pnv_phb *phb = pe->phb;
int64_t rc;
const unsigned long size = tbl->it_indirect_levels ?
tbl->it_level_size : tbl->it_size;
const __u64 start_addr = tbl->it_offset << tbl->it_page_shift;
const __u64 win_size = tbl->it_size << tbl->it_page_shift;
pe_info(pe, "Setting up window#%d %llx..%llx pg=%x\n", num,
start_addr, start_addr + win_size - 1,
IOMMU_PAGE_SIZE(tbl));
/*
* Map TCE table through TVT. The TVE index is the PE number
* shifted by 1 bit for 32-bits DMA space.
*/
rc = opal_pci_map_pe_dma_window(phb->opal_id,
pe->pe_number,
(pe->pe_number << 1) + num,
tbl->it_indirect_levels + 1,
__pa(tbl->it_base),
size << 3,
IOMMU_PAGE_SIZE(tbl));
if (rc) {
pe_err(pe, "Failed to configure TCE table, err %ld\n", rc);
return rc;
}
pnv_pci_link_table_and_group(phb->hose->node, num,
tbl, &pe->table_group);
pnv_pci_ioda2_tce_invalidate_entire(pe);
return 0;
}
static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable)
{
uint16_t window_id = (pe->pe_number << 1 ) + 1;
int64_t rc;
pe_info(pe, "%sabling 64-bit DMA bypass\n", enable ? "En" : "Dis");
if (enable) {
phys_addr_t top = memblock_end_of_DRAM();
top = roundup_pow_of_two(top);
rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
pe->pe_number,
window_id,
pe->tce_bypass_base,
top);
} else {
rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
pe->pe_number,
window_id,
pe->tce_bypass_base,
0);
}
if (rc)
pe_err(pe, "OPAL error %lld configuring bypass window\n", rc);
else
pe->tce_bypass_enabled = enable;
}
static long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset,
__u32 page_shift, __u64 window_size, __u32 levels,
struct iommu_table *tbl);
static long pnv_pci_ioda2_create_table(struct iommu_table_group *table_group,
int num, __u32 page_shift, __u64 window_size, __u32 levels,
struct iommu_table **ptbl)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
table_group);
int nid = pe->phb->hose->node;
__u64 bus_offset = num ? pe->tce_bypass_base : table_group->tce32_start;
long ret;
struct iommu_table *tbl;
tbl = pnv_pci_table_alloc(nid);
if (!tbl)
return -ENOMEM;
ret = pnv_pci_ioda2_table_alloc_pages(nid,
bus_offset, page_shift, window_size,
levels, tbl);
if (ret) {
iommu_free_table(tbl, "pnv");
return ret;
}
tbl->it_ops = &pnv_ioda2_iommu_ops;
if (pe->phb->ioda.tce_inval_reg)
tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);
*ptbl = tbl;
return 0;
}
static long pnv_pci_ioda2_setup_default_config(struct pnv_ioda_pe *pe)
{
struct iommu_table *tbl = NULL;
long rc;
rc = pnv_pci_ioda2_create_table(&pe->table_group, 0,
IOMMU_PAGE_SHIFT_4K,
pe->table_group.tce32_size,
POWERNV_IOMMU_DEFAULT_LEVELS, &tbl);
if (rc) {
pe_err(pe, "Failed to create 32-bit TCE table, err %ld",
rc);
return rc;
}
iommu_init_table(tbl, pe->phb->hose->node);
rc = pnv_pci_ioda2_set_window(&pe->table_group, 0, tbl);
if (rc) {
pe_err(pe, "Failed to configure 32-bit TCE table, err %ld\n",
rc);
pnv_ioda2_table_free(tbl);
return rc;
}
if (!pnv_iommu_bypass_disabled)
pnv_pci_ioda2_set_bypass(pe, true);
/* OPAL variant of PHB3 invalidated TCEs */
if (pe->phb->ioda.tce_inval_reg)
tbl->it_type |= (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE);
/*
* Setting table base here only for carrying iommu_group
* further down to let iommu_add_device() do the job.
* pnv_pci_ioda_dma_dev_setup will override it later anyway.
*/
if (pe->flags & PNV_IODA_PE_DEV)
set_iommu_table_base(&pe->pdev->dev, tbl);
return 0;
}
#if defined(CONFIG_IOMMU_API) || defined(CONFIG_PCI_IOV)
static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group,
int num)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
table_group);
struct pnv_phb *phb = pe->phb;
long ret;
pe_info(pe, "Removing DMA window #%d\n", num);
ret = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
(pe->pe_number << 1) + num,
0/* levels */, 0/* table address */,
0/* table size */, 0/* page size */);
if (ret)
pe_warn(pe, "Unmapping failed, ret = %ld\n", ret);
else
pnv_pci_ioda2_tce_invalidate_entire(pe);
pnv_pci_unlink_table_and_group(table_group->tables[num], table_group);
return ret;
}
#endif
#ifdef CONFIG_IOMMU_API
static unsigned long pnv_pci_ioda2_get_table_size(__u32 page_shift,
__u64 window_size, __u32 levels)
{
unsigned long bytes = 0;
const unsigned window_shift = ilog2(window_size);
unsigned entries_shift = window_shift - page_shift;
unsigned table_shift = entries_shift + 3;
unsigned long tce_table_size = max(0x1000UL, 1UL << table_shift);
unsigned long direct_table_size;
if (!levels || (levels > POWERNV_IOMMU_MAX_LEVELS) ||
(window_size > memory_hotplug_max()) ||
!is_power_of_2(window_size))
return 0;
/* Calculate a direct table size from window_size and levels */
entries_shift = (entries_shift + levels - 1) / levels;
table_shift = entries_shift + 3;
table_shift = max_t(unsigned, table_shift, PAGE_SHIFT);
direct_table_size = 1UL << table_shift;
for ( ; levels; --levels) {
bytes += _ALIGN_UP(tce_table_size, direct_table_size);
tce_table_size /= direct_table_size;
tce_table_size <<= 3;
tce_table_size = _ALIGN_UP(tce_table_size, direct_table_size);
}
return bytes;
}
static void pnv_ioda2_take_ownership(struct iommu_table_group *table_group)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
table_group);
/* Store @tbl as pnv_pci_ioda2_unset_window() resets it */
struct iommu_table *tbl = pe->table_group.tables[0];
pnv_pci_ioda2_set_bypass(pe, false);
pnv_pci_ioda2_unset_window(&pe->table_group, 0);
pnv_ioda2_table_free(tbl);
}
static void pnv_ioda2_release_ownership(struct iommu_table_group *table_group)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
table_group);
pnv_pci_ioda2_setup_default_config(pe);
}
static struct iommu_table_group_ops pnv_pci_ioda2_ops = {
.get_table_size = pnv_pci_ioda2_get_table_size,
.create_table = pnv_pci_ioda2_create_table,
.set_window = pnv_pci_ioda2_set_window,
.unset_window = pnv_pci_ioda2_unset_window,
.take_ownership = pnv_ioda2_take_ownership,
.release_ownership = pnv_ioda2_release_ownership,
};
#endif
static void pnv_pci_ioda_setup_opal_tce_kill(struct pnv_phb *phb)
{
const __be64 *swinvp;
/* OPAL variant of PHB3 invalidated TCEs */
swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
if (!swinvp)
return;
phb->ioda.tce_inval_reg_phys = be64_to_cpup(swinvp);
phb->ioda.tce_inval_reg = ioremap(phb->ioda.tce_inval_reg_phys, 8);
}
static __be64 *pnv_pci_ioda2_table_do_alloc_pages(int nid, unsigned shift,
unsigned levels, unsigned long limit,
unsigned long *current_offset, unsigned long *total_allocated)
{
struct page *tce_mem = NULL;
__be64 *addr, *tmp;
unsigned order = max_t(unsigned, shift, PAGE_SHIFT) - PAGE_SHIFT;
unsigned long allocated = 1UL << (order + PAGE_SHIFT);
unsigned entries = 1UL << (shift - 3);
long i;
tce_mem = alloc_pages_node(nid, GFP_KERNEL, order);
if (!tce_mem) {
pr_err("Failed to allocate a TCE memory, order=%d\n", order);
return NULL;
}
addr = page_address(tce_mem);
memset(addr, 0, allocated);
*total_allocated += allocated;
--levels;
if (!levels) {
*current_offset += allocated;
return addr;
}
for (i = 0; i < entries; ++i) {
tmp = pnv_pci_ioda2_table_do_alloc_pages(nid, shift,
levels, limit, current_offset, total_allocated);
if (!tmp)
break;
addr[i] = cpu_to_be64(__pa(tmp) |
TCE_PCI_READ | TCE_PCI_WRITE);
if (*current_offset >= limit)
break;
}
return addr;
}
static void pnv_pci_ioda2_table_do_free_pages(__be64 *addr,
unsigned long size, unsigned level);
static long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset,
__u32 page_shift, __u64 window_size, __u32 levels,
struct iommu_table *tbl)
{
void *addr;
unsigned long offset = 0, level_shift, total_allocated = 0;
const unsigned window_shift = ilog2(window_size);
unsigned entries_shift = window_shift - page_shift;
unsigned table_shift = max_t(unsigned, entries_shift + 3, PAGE_SHIFT);
const unsigned long tce_table_size = 1UL << table_shift;
if (!levels || (levels > POWERNV_IOMMU_MAX_LEVELS))
return -EINVAL;
if ((window_size > memory_hotplug_max()) || !is_power_of_2(window_size))
return -EINVAL;
/* Adjust direct table size from window_size and levels */
entries_shift = (entries_shift + levels - 1) / levels;
level_shift = entries_shift + 3;
level_shift = max_t(unsigned, level_shift, PAGE_SHIFT);
/* Allocate TCE table */
addr = pnv_pci_ioda2_table_do_alloc_pages(nid, level_shift,
levels, tce_table_size, &offset, &total_allocated);
/* addr==NULL means that the first level allocation failed */
if (!addr)
return -ENOMEM;
/*
* First level was allocated but some lower level failed as
* we did not allocate as much as we wanted,
* release partially allocated table.
*/
if (offset < tce_table_size) {
pnv_pci_ioda2_table_do_free_pages(addr,
1ULL << (level_shift - 3), levels - 1);
return -ENOMEM;
}
/* Setup linux iommu table */
pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, bus_offset,
page_shift);
tbl->it_level_size = 1ULL << (level_shift - 3);
tbl->it_indirect_levels = levels - 1;
tbl->it_allocated_size = total_allocated;
pr_devel("Created TCE table: ws=%08llx ts=%lx @%08llx\n",
window_size, tce_table_size, bus_offset);
return 0;
}
static void pnv_pci_ioda2_table_do_free_pages(__be64 *addr,
unsigned long size, unsigned level)
{
const unsigned long addr_ul = (unsigned long) addr &
~(TCE_PCI_READ | TCE_PCI_WRITE);
if (level) {
long i;
u64 *tmp = (u64 *) addr_ul;
for (i = 0; i < size; ++i) {
unsigned long hpa = be64_to_cpu(tmp[i]);
if (!(hpa & (TCE_PCI_READ | TCE_PCI_WRITE)))
continue;
pnv_pci_ioda2_table_do_free_pages(__va(hpa), size,
level - 1);
}
}
free_pages(addr_ul, get_order(size << 3));
}
static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl)
{
const unsigned long size = tbl->it_indirect_levels ?
tbl->it_level_size : tbl->it_size;
if (!tbl->it_size)
return;
pnv_pci_ioda2_table_do_free_pages((__be64 *)tbl->it_base, size,
tbl->it_indirect_levels);
}
static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
struct pnv_ioda_pe *pe)
{
int64_t rc;
/* We shouldn't already have a 32-bit DMA associated */
if (WARN_ON(pe->tce32_seg >= 0))
return;
/* TVE #1 is selected by PCI address bit 59 */
pe->tce_bypass_base = 1ull << 59;
iommu_register_group(&pe->table_group, phb->hose->global_number,
pe->pe_number);
/* The PE will reserve all possible 32-bits space */
pe->tce32_seg = 0;
pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n",
phb->ioda.m32_pci_base);
/* Setup linux iommu table */
pe->table_group.tce32_start = 0;
pe->table_group.tce32_size = phb->ioda.m32_pci_base;
pe->table_group.max_dynamic_windows_supported =
IOMMU_TABLE_GROUP_MAX_TABLES;
pe->table_group.max_levels = POWERNV_IOMMU_MAX_LEVELS;
pe->table_group.pgsizes = SZ_4K | SZ_64K | SZ_16M;
#ifdef CONFIG_IOMMU_API
pe->table_group.ops = &pnv_pci_ioda2_ops;
#endif
rc = pnv_pci_ioda2_setup_default_config(pe);
if (rc) {
if (pe->tce32_seg >= 0)
pe->tce32_seg = -1;
return;
}
if (pe->flags & PNV_IODA_PE_DEV)
iommu_add_device(&pe->pdev->dev);
else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))
pnv_ioda_setup_bus_dma(pe, pe->pbus);
}
static void pnv_ioda_setup_dma(struct pnv_phb *phb)
{
struct pci_controller *hose = phb->hose;
unsigned int residual, remaining, segs, tw, base;
struct pnv_ioda_pe *pe;
/* If we have more PE# than segments available, hand out one
* per PE until we run out and let the rest fail. If not,
* then we assign at least one segment per PE, plus more based
* on the amount of devices under that PE
*/
if (phb->ioda.dma_pe_count > phb->ioda.tce32_count)
residual = 0;
else
residual = phb->ioda.tce32_count -
phb->ioda.dma_pe_count;
pr_info("PCI: Domain %04x has %ld available 32-bit DMA segments\n",
hose->global_number, phb->ioda.tce32_count);
pr_info("PCI: %d PE# for a total weight of %d\n",
phb->ioda.dma_pe_count, phb->ioda.dma_weight);
pnv_pci_ioda_setup_opal_tce_kill(phb);
/* Walk our PE list and configure their DMA segments, hand them
* out one base segment plus any residual segments based on
* weight
*/
remaining = phb->ioda.tce32_count;
tw = phb->ioda.dma_weight;
base = 0;
list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
if (!pe->dma_weight)
continue;
if (!remaining) {
pe_warn(pe, "No DMA32 resources available\n");
continue;
}
segs = 1;
if (residual) {
segs += ((pe->dma_weight * residual) + (tw / 2)) / tw;
if (segs > remaining)
segs = remaining;
}
/*
* For IODA2 compliant PHB3, we needn't care about the weight.
* The all available 32-bits DMA space will be assigned to
* the specific PE.
*/
if (phb->type == PNV_PHB_IODA1) {
pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n",
pe->dma_weight, segs);
pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
} else {
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_get_phb_node(struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
return of_node_get(hose->dn);
}
EXPORT_SYMBOL(pnv_pci_get_phb_node);
int pnv_phb_to_cxl_mode(struct pci_dev *dev, uint64_t mode)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
struct pnv_ioda_pe *pe;
int rc;
pe = pnv_ioda_get_pe(dev);
if (!pe)
return -ENODEV;
pe_info(pe, "Switching PHB to CXL\n");
rc = opal_pci_set_phb_cxl_mode(phb->opal_id, mode, pe->pe_number);
if (rc)
dev_err(&dev->dev, "opal_pci_set_phb_cxl_mode failed: %i\n", rc);
return rc;
}
EXPORT_SYMBOL(pnv_phb_to_cxl_mode);
/* Find PHB for cxl dev and allocate MSI hwirqs?
* Returns the absolute hardware IRQ number
*/
int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
int hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, num);
if (hwirq < 0) {
dev_warn(&dev->dev, "Failed to find a free MSI\n");
return -ENOSPC;
}
return phb->msi_base + hwirq;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirqs);
void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq - phb->msi_base, num);
}
EXPORT_SYMBOL(pnv_cxl_release_hwirqs);
void pnv_cxl_release_hwirq_ranges(struct cxl_irq_ranges *irqs,
struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
int i, hwirq;
for (i = 1; i < CXL_IRQ_RANGES; i++) {
if (!irqs->range[i])
continue;
pr_devel("cxl release irq range 0x%x: offset: 0x%lx limit: %ld\n",
i, irqs->offset[i],
irqs->range[i]);
hwirq = irqs->offset[i] - phb->msi_base;
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq,
irqs->range[i]);
}
}
EXPORT_SYMBOL(pnv_cxl_release_hwirq_ranges);
int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs,
struct pci_dev *dev, int num)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
int i, hwirq, try;
memset(irqs, 0, sizeof(struct cxl_irq_ranges));
/* 0 is reserved for the multiplexed PSL DSI interrupt */
for (i = 1; i < CXL_IRQ_RANGES && num; i++) {
try = num;
while (try) {
hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, try);
if (hwirq >= 0)
break;
try /= 2;
}
if (!try)
goto fail;
irqs->offset[i] = phb->msi_base + hwirq;
irqs->range[i] = try;
pr_devel("cxl alloc irq range 0x%x: offset: 0x%lx limit: %li\n",
i, irqs->offset[i], irqs->range[i]);
num -= try;
}
if (num)
goto fail;
return 0;
fail:
pnv_cxl_release_hwirq_ranges(irqs, dev);
return -ENOSPC;
}
EXPORT_SYMBOL(pnv_cxl_alloc_hwirq_ranges);
int pnv_cxl_get_irq_count(struct pci_dev *dev)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
return phb->msi_bmp.irq_count;
}
EXPORT_SYMBOL(pnv_cxl_get_irq_count);
int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
unsigned int virq)
{
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
unsigned int xive_num = hwirq - phb->msi_base;
struct pnv_ioda_pe *pe;
int rc;
if (!(pe = pnv_ioda_get_pe(dev)))
return -ENODEV;
/* Assign XIVE to PE */
rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
if (rc) {
pe_warn(pe, "%s: OPAL error %d setting msi_base 0x%x "
"hwirq 0x%x XIVE 0x%x PE\n",
pci_name(dev), rc, phb->msi_base, hwirq, xive_num);
return -EIO;
}
set_msi_irq_chip(phb, virq);
return 0;
}
EXPORT_SYMBOL(pnv_cxl_ioda_msi_setup);
#endif
static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
unsigned int hwirq, unsigned int virq,
unsigned int is_64, struct msi_msg *msg)
{
struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
unsigned int xive_num = hwirq - phb->msi_base;
__be32 data;
int rc;
/* No PE assigned ? bail out ... no MSI for you ! */
if (pe == NULL)
return -ENXIO;
/* Check if we have an MVE */
if (pe->mve_number < 0)
return -ENXIO;
/* Force 32-bit MSI on some broken devices */
if (dev->no_64bit_msi)
is_64 = 0;
/* Assign XIVE to PE */
rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
if (rc) {
pr_warn("%s: OPAL error %d setting XIVE %d PE\n",
pci_name(dev), rc, xive_num);
return -EIO;
}
if (is_64) {
__be64 addr64;
rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1,
&addr64, &data);
if (rc) {
pr_warn("%s: OPAL error %d getting 64-bit MSI data\n",
pci_name(dev), rc);
return -EIO;
}
msg->address_hi = be64_to_cpu(addr64) >>