// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Support PCI / PCIe on PowerNV platforms
*
* Copyright 2011 Benjamin Herrenschmidt , IBM Corp .
*/
#undef DEBUG
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/crash_dump.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/memblock.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/msi.h>
#include <linux/iommu.h>
#include <linux/rculist.h>
#include <linux/sizes.h>
#include <linux/debugfs.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <asm /sections.h>
#include <asm /io.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 /firmware.h>
#include <asm /pnv-pci.h>
#include <asm /mmzone.h>
#include <asm /xive.h>
#include "powernv.h"
#include "pci.h"
#include "../../../../drivers/pci/pci.h"
/* This array is indexed with enum pnv_phb_type */
static const char * const pnv_phb_names[] = { "IODA2" , "NPU_OCAPI" };
static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable);
static void pnv_pci_configure_bus(struct pci_bus *bus);
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)
strscpy(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 & 0 xff00) >> 8 ,
PCI_SLOT(pe->rid), PCI_FUNC(pe->rid));
#endif /* CONFIG_PCI_IOV*/
printk("%spci %s: [PE# %.2x] %pV" ,
level, pfix, pe->pe_number, &vaf);
va_end(args);
}
static bool pnv_iommu_bypass_disabled __read_mostly;
static bool pci_reset_phbs __read_mostly;
static int __init iommu_setup(char *str)
{
if (!str)
return -EINVAL;
while (*str) {
if (!strncmp(str, "nobypass" , 8 )) {
pnv_iommu_bypass_disabled = true ;
pr_info("PowerNV: IOMMU bypass window disabled.\n" );
break ;
}
str += strcspn(str, "," );
if (*str == ',' )
str++;
}
return 0 ;
}
early_param("iommu" , iommu_setup);
static int __init pci_reset_phbs_setup(char *str)
{
pci_reset_phbs = true ;
return 0 ;
}
early_param("ppc_pci_reset_phbs" , pci_reset_phbs_setup);
static struct pnv_ioda_pe *pnv_ioda_init_pe(struct pnv_phb *phb, int pe_no)
{
s64 rc;
phb->ioda.pe_array[pe_no].phb = phb;
phb->ioda.pe_array[pe_no].pe_number = pe_no;
phb->ioda.pe_array[pe_no].dma_setup_done = false ;
/*
* Clear the PE frozen state as it might be put into frozen state
* in the last PCI remove path . It ' s not harmful to do so when the
* PE is already in unfrozen state .
*/
rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
if (rc != OPAL_SUCCESS && rc != OPAL_UNSUPPORTED)
pr_warn("%s: Error %lld unfreezing PHB#%x-PE#%x\n" ,
__func__, rc, phb->hose->global_number, pe_no);
return &phb->ioda.pe_array[pe_no];
}
static void pnv_ioda_reserve_pe(struct pnv_phb *phb, int pe_no)
{
if (!(pe_no >= 0 && pe_no < phb->ioda.total_pe_num)) {
pr_warn("%s: Invalid PE %x on PHB#%x\n" ,
__func__, pe_no, phb->hose->global_number);
return ;
}
mutex_lock(&phb->ioda.pe_alloc_mutex);
if (test_and_set_bit(pe_no, phb->ioda.pe_alloc))
pr_debug("%s: PE %x was reserved on PHB#%x\n" ,
__func__, pe_no, phb->hose->global_number);
mutex_unlock(&phb->ioda.pe_alloc_mutex);
pnv_ioda_init_pe(phb, pe_no);
}
struct pnv_ioda_pe *pnv_ioda_alloc_pe(struct pnv_phb *phb, int count)
{
struct pnv_ioda_pe *ret = NULL;
int run = 0 , pe, i;
mutex_lock(&phb->ioda.pe_alloc_mutex);
/* scan backwards for a run of @count cleared bits */
for (pe = phb->ioda.total_pe_num - 1 ; pe >= 0 ; pe--) {
if (test_bit(pe, phb->ioda.pe_alloc)) {
run = 0 ;
continue ;
}
run++;
if (run == count)
break ;
}
if (run != count)
goto out;
for (i = pe; i < pe + count; i++) {
set_bit(i, phb->ioda.pe_alloc);
pnv_ioda_init_pe(phb, i);
}
ret = &phb->ioda.pe_array[pe];
out:
mutex_unlock(&phb->ioda.pe_alloc_mutex);
return ret;
}
void pnv_ioda_free_pe(struct pnv_ioda_pe *pe)
{
struct pnv_phb *phb = pe->phb;
unsigned int pe_num = pe->pe_number;
WARN_ON(pe->pdev);
memset(pe, 0 , sizeof (struct pnv_ioda_pe));
mutex_lock(&phb->ioda.pe_alloc_mutex);
clear_bit(pe_num, phb->ioda.pe_alloc);
mutex_unlock(&phb->ioda.pe_alloc_mutex);
}
/* The default M64 BAR is shared by all PEs */
static int pnv_ioda2_init_m64(struct pnv_phb *phb)
{
const char *desc;
struct resource *r;
s64 rc;
/* Configure the default M64 BAR */
rc = opal_pci_set_phb_mem_window(phb->opal_id,
OPAL_M64_WINDOW_TYPE,
phb->ioda.m64_bar_idx,
phb->ioda.m64_base,
0 , /* unused */
phb->ioda.m64_size);
if (rc != OPAL_SUCCESS) {
desc = "configuring" ;
goto fail;
}
/* Enable the default M64 BAR */
rc = opal_pci_phb_mmio_enable(phb->opal_id,
OPAL_M64_WINDOW_TYPE,
phb->ioda.m64_bar_idx,
OPAL_ENABLE_M64_SPLIT);
if (rc != OPAL_SUCCESS) {
desc = "enabling" ;
goto fail;
}
/*
* Exclude the segments for reserved and root bus PE , which
* are first or last two PEs .
*/
r = &phb->hose->mem_resources[1 ];
if (phb->ioda.reserved_pe_idx == 0 )
r->start += (2 * phb->ioda.m64_segsize);
else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1 ))
r->end -= (2 * phb->ioda.m64_segsize);
else
pr_warn(" Cannot strip M64 segment for reserved PE#%x\n" ,
phb->ioda.reserved_pe_idx);
return 0 ;
fail:
pr_warn(" Failure %lld %s M64 BAR#%d\n" ,
rc, desc, phb->ioda.m64_bar_idx);
opal_pci_phb_mmio_enable(phb->opal_id,
OPAL_M64_WINDOW_TYPE,
phb->ioda.m64_bar_idx,
OPAL_DISABLE_M64);
return -EIO;
}
static void pnv_ioda_reserve_dev_m64_pe(struct pci_dev *pdev,
unsigned long *pe_bitmap)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(pdev->bus);
struct resource *r;
resource_size_t base, sgsz, start, end;
int segno, i;
base = phb->ioda.m64_base;
sgsz = phb->ioda.m64_segsize;
for (i = 0 ; i <= PCI_ROM_RESOURCE; i++) {
r = &pdev->resource[i];
if (!r->parent || !pnv_pci_is_m64(phb, r))
continue ;
start = ALIGN_DOWN(r->start - base, sgsz);
end = ALIGN(r->end - base, sgsz);
for (segno = start / sgsz; segno < end / sgsz; segno++) {
if (pe_bitmap)
set_bit(segno, pe_bitmap);
else
pnv_ioda_reserve_pe(phb, segno);
}
}
}
static void pnv_ioda_reserve_m64_pe(struct pci_bus *bus,
unsigned long *pe_bitmap,
bool all)
{
struct pci_dev *pdev;
list_for_each_entry(pdev, &bus->devices, bus_list) {
pnv_ioda_reserve_dev_m64_pe(pdev, pe_bitmap);
if (all && pdev->subordinate)
pnv_ioda_reserve_m64_pe(pdev->subordinate,
pe_bitmap, all);
}
}
static struct pnv_ioda_pe *pnv_ioda_pick_m64_pe(struct pci_bus *bus, bool all)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(bus);
struct pnv_ioda_pe *master_pe, *pe;
unsigned long size, *pe_alloc;
int i;
/* Root bus shouldn't use M64 */
if (pci_is_root_bus(bus))
return NULL;
/* Allocate bitmap */
size = ALIGN(phb->ioda.total_pe_num / 8 , sizeof (unsigned long ));
pe_alloc = kzalloc(size, GFP_KERNEL);
if (!pe_alloc) {
pr_warn("%s: Out of memory !\n" ,
__func__);
return NULL;
}
/* Figure out reserved PE numbers by the PE */
pnv_ioda_reserve_m64_pe(bus, pe_alloc, all);
/*
* the current bus might not own M64 window and that ' s all
* contributed by its child buses . For the case , we needn ' t
* pick M64 dependent PE # .
*/
if (bitmap_empty(pe_alloc, phb->ioda.total_pe_num)) {
kfree(pe_alloc);
return NULL;
}
/*
* Figure out the master PE and put all slave PEs to master
* PE ' s list to form compound PE .
*/
master_pe = NULL;
i = -1 ;
while ((i = find_next_bit(pe_alloc, phb->ioda.total_pe_num, i + 1 )) <
phb->ioda.total_pe_num) {
pe = &phb->ioda.pe_array[i];
phb->ioda.m64_segmap[pe->pe_number] = pe->pe_number;
if (!master_pe) {
pe->flags |= PNV_IODA_PE_MASTER;
INIT_LIST_HEAD(&pe->slaves);
master_pe = pe;
} else {
pe->flags |= PNV_IODA_PE_SLAVE;
pe->master = master_pe;
list_add_tail(&pe->list, &master_pe->slaves);
}
}
kfree(pe_alloc);
return master_pe;
}
static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb)
{
struct pci_controller *hose = phb->hose;
struct device_node *dn = hose->dn;
struct resource *res;
u32 m64_range[2 ], i;
const __be32 *r;
u64 pci_addr;
if (phb->type != PNV_PHB_IODA2) {
pr_info(" Not support M64 window\n" );
return ;
}
if (!firmware_has_feature(FW_FEATURE_OPAL)) {
pr_info(" Firmware too old to support M64 window\n" );
return ;
}
r = of_get_property(dn, "ibm,opal-m64-window" , NULL);
if (!r) {
pr_info(" No <ibm,opal-m64-window> on %pOF\n" ,
dn);
return ;
}
/*
* Find the available M64 BAR range and pickup the last one for
* covering the whole 64 - bits space . We support only one range .
*/
if (of_property_read_u32_array(dn, "ibm,opal-available-m64-ranges" ,
m64_range, 2 )) {
/* In absence of the property, assume 0..15 */
m64_range[0 ] = 0 ;
m64_range[1 ] = 16 ;
}
/* We only support 64 bits in our allocator */
if (m64_range[1 ] > 63 ) {
pr_warn("%s: Limiting M64 range to 63 (from %d) on PHB#%x\n" ,
__func__, m64_range[1 ], phb->hose->global_number);
m64_range[1 ] = 63 ;
}
/* Empty range, no m64 */
if (m64_range[1 ] <= m64_range[0 ]) {
pr_warn("%s: M64 empty, disabling M64 usage on PHB#%x\n" ,
__func__, phb->hose->global_number);
return ;
}
/* Configure M64 informations */
res = &hose->mem_resources[1 ];
res->name = dn->full_name;
res->start = of_translate_address(dn, r + 2 );
res->end = res->start + of_read_number(r + 4 , 2 ) - 1 ;
res->flags = (IORESOURCE_MEM | IORESOURCE_MEM_64 | IORESOURCE_PREFETCH);
pci_addr = of_read_number(r, 2 );
hose->mem_offset[1 ] = res->start - pci_addr;
phb->ioda.m64_size = resource_size(res);
phb->ioda.m64_segsize = phb->ioda.m64_size / phb->ioda.total_pe_num;
phb->ioda.m64_base = pci_addr;
/* This lines up nicely with the display from processing OF ranges */
pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx (M64 #%d..%d)\n" ,
res->start, res->end, pci_addr, m64_range[0 ],
m64_range[0 ] + m64_range[1 ] - 1 );
/* Mark all M64 used up by default */
phb->ioda.m64_bar_alloc = (unsigned long )-1 ;
/* Use last M64 BAR to cover M64 window */
m64_range[1 ]--;
phb->ioda.m64_bar_idx = m64_range[0 ] + m64_range[1 ];
pr_info(" Using M64 #%d as default window\n" , phb->ioda.m64_bar_idx);
/* Mark remaining ones free */
for (i = m64_range[0 ]; i < m64_range[1 ]; i++)
clear_bit(i, &phb->ioda.m64_bar_alloc);
/*
* Setup init functions for M64 based on IODA version , IODA3 uses
* the IODA2 code .
*/
phb->init_m64 = pnv_ioda2_init_m64;
}
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 = 0 , state;
__be16 pcierr = 0 ;
s64 rc;
/* Sanity check on PE number */
if (pe_no < 0 || pe_no >= phb->ioda.total_pe_num)
return OPAL_EEH_STOPPED_PERM_UNAVAIL;
/*
* Fetch the master PE and the PE instance might be
* not initialized yet .
*/
pe = &phb->ioda.pe_array[pe_no];
if (pe->flags & PNV_IODA_PE_SLAVE) {
pe = pe->master;
WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
pe_no = pe->pe_number;
}
/* Check the master PE */
rc = opal_pci_eeh_freeze_status(phb->opal_id, pe_no,
&state, &pcierr, NULL);
if (rc != OPAL_SUCCESS) {
pr_warn("%s: Failure %lld getting "
"PHB#%x-PE#%x state\n" ,
__func__, rc,
phb->hose->global_number, pe_no);
return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
}
/* Check the slave PE */
if (!(pe->flags & PNV_IODA_PE_MASTER))
return state;
list_for_each_entry(slave, &pe->slaves, list) {
rc = opal_pci_eeh_freeze_status(phb->opal_id,
slave->pe_number,
&fstate,
&pcierr,
NULL);
if (rc != OPAL_SUCCESS) {
pr_warn("%s: Failure %lld getting "
"PHB#%x-PE#%x state\n" ,
__func__, rc,
phb->hose->global_number, slave->pe_number);
return OPAL_EEH_STOPPED_TEMP_UNAVAIL;
}
/*
* Override the result based on the ascending
* priority .
*/
if (fstate > state)
state = fstate;
}
return state;
}
struct pnv_ioda_pe *pnv_pci_bdfn_to_pe(struct pnv_phb *phb, u16 bdfn)
{
int pe_number = phb->ioda.pe_rmap[bdfn];
if (pe_number == IODA_INVALID_PE)
return NULL;
return &phb->ioda.pe_array[pe_number];
}
struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(dev->bus);
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];
}
static int pnv_ioda_set_one_peltv(struct pnv_phb *phb,
struct pnv_ioda_pe *parent,
struct pnv_ioda_pe *child,
bool is_add)
{
const char *desc = is_add ? "adding" : "removing" ;
uint8_t op = is_add ? OPAL_ADD_PE_TO_DOMAIN :
OPAL_REMOVE_PE_FROM_DOMAIN;
struct pnv_ioda_pe *slave;
long rc;
/* Parent PE affects child PE */
rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number,
child->pe_number, op);
if (rc != OPAL_SUCCESS) {
pe_warn(child, "OPAL error %ld %s to parent PELTV\n" ,
rc, desc);
return -ENXIO;
}
if (!(child->flags & PNV_IODA_PE_MASTER))
return 0 ;
/* Compound case: parent PE affects slave PEs */
list_for_each_entry(slave, &child->slaves, list) {
rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number,
slave->pe_number, op);
if (rc != OPAL_SUCCESS) {
pe_warn(slave, "OPAL error %ld %s to parent PELTV\n" ,
rc, desc);
return -ENXIO;
}
}
return 0 ;
}
static int pnv_ioda_set_peltv(struct pnv_phb *phb,
struct pnv_ioda_pe *pe,
bool is_add)
{
struct pnv_ioda_pe *slave;
struct pci_dev *pdev = NULL;
int ret;
/*
* Clear PE frozen state . If it ' s master PE , we need
* clear slave PE frozen state as well .
*/
if (is_add) {
opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
if (pe->flags & PNV_IODA_PE_MASTER) {
list_for_each_entry(slave, &pe->slaves, list)
opal_pci_eeh_freeze_clear(phb->opal_id,
slave->pe_number,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
}
}
/*
* Associate PE in PELT . We need add the PE into the
* corresponding PELT - V as well . Otherwise , the error
* originated from the PE might contribute to other
* PEs .
*/
ret = pnv_ioda_set_one_peltv(phb, pe, pe, is_add);
if (ret)
return ret;
/* For compound PEs, any one affects all of them */
if (pe->flags & PNV_IODA_PE_MASTER) {
list_for_each_entry(slave, &pe->slaves, list) {
ret = pnv_ioda_set_one_peltv(phb, slave, pe, is_add);
if (ret)
return ret;
}
}
if (pe->flags & (PNV_IODA_PE_BUS_ALL | PNV_IODA_PE_BUS))
pdev = pe->pbus->self;
else if (pe->flags & PNV_IODA_PE_DEV)
pdev = pe->pdev->bus->self;
#ifdef CONFIG_PCI_IOV
else if (pe->flags & PNV_IODA_PE_VF)
pdev = pe->parent_dev;
#endif /* CONFIG_PCI_IOV */
while (pdev) {
struct pci_dn *pdn = pci_get_pdn(pdev);
struct pnv_ioda_pe *parent;
if (pdn && pdn->pe_number != IODA_INVALID_PE) {
parent = &phb->ioda.pe_array[pdn->pe_number];
ret = pnv_ioda_set_one_peltv(phb, parent, pe, is_add);
if (ret)
return ret;
}
pdev = pdev->bus->self;
}
return 0 ;
}
static void pnv_ioda_unset_peltv(struct pnv_phb *phb,
struct pnv_ioda_pe *pe,
struct pci_dev *parent)
{
int64_t rc;
while (parent) {
struct pci_dn *pdn = pci_get_pdn(parent);
if (pdn && pdn->pe_number != IODA_INVALID_PE) {
rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number,
pe->pe_number,
OPAL_REMOVE_PE_FROM_DOMAIN);
/* XXX What to do in case of error ? */
}
parent = parent->bus->self;
}
opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
/* Disassociate PE in PELT */
rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number,
pe->pe_number, OPAL_REMOVE_PE_FROM_DOMAIN);
if (rc)
pe_warn(pe, "OPAL error %lld remove self from PELTV\n" , rc);
}
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 = resource_size(&pe->pbus->busn_res);
else
count = 1 ;
switch (count) {
case 1 : bcomp = OpalPciBusAll; break ;
case 2 : bcomp = OpalPciBus7Bits; break ;
case 4 : bcomp = OpalPciBus6Bits; break ;
case 8 : bcomp = OpalPciBus5Bits; break ;
case 16 : bcomp = OpalPciBus4Bits; break ;
case 32 : bcomp = OpalPciBus3Bits; break ;
default :
dev_err(&pe->pbus->dev, "Number of subordinate buses %d unsupported\n" ,
count);
/* Do an exact match only */
bcomp = OpalPciBusAll;
}
rid_end = pe->rid + (count << 8 );
} else {
#ifdef CONFIG_PCI_IOV
if (pe->flags & PNV_IODA_PE_VF)
parent = pe->parent_dev;
else
#endif
parent = pe->pdev->bus->self;
bcomp = OpalPciBusAll;
dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
rid_end = pe->rid + 1 ;
}
/* Clear the reverse map */
for (rid = pe->rid; rid < rid_end; rid++)
phb->ioda.pe_rmap[rid] = IODA_INVALID_PE;
/*
* Release from all parents PELT - V . NPUs don ' t have a PELTV
* table
*/
if (phb->type != PNV_PHB_NPU_OCAPI)
pnv_ioda_unset_peltv(phb, pe, parent);
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 %lld trying to setup PELT table\n" , rc);
pe->pbus = NULL;
pe->pdev = NULL;
#ifdef CONFIG_PCI_IOV
pe->parent_dev = NULL;
#endif
return 0 ;
}
int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
{
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;
if (pe->flags & PNV_IODA_PE_BUS_ALL)
count = resource_size(&pe->pbus->busn_res);
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 {
bcomp = OpalPciBusAll;
dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
rid_end = pe->rid + 1 ;
}
/*
* Associate PE in PELT . We need add the PE into the
* corresponding PELT - V as well . Otherwise , the error
* originated from the PE might contribute to other
* PEs .
*/
rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
bcomp, dcomp, fcomp, OPAL_MAP_PE);
if (rc) {
pe_err(pe, "OPAL error %ld trying to setup PELT table\n" , rc);
return -ENXIO;
}
/*
* Configure PELTV . NPUs don ' t have a PELTV table so skip
* configuration on them .
*/
if (phb->type != PNV_PHB_NPU_OCAPI)
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;
pe->mve_number = 0 ;
return 0 ;
}
static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(dev->bus);
struct pci_dn *pdn = pci_get_pdn(dev);
struct pnv_ioda_pe *pe;
if (!pdn) {
pr_err("%s: Device tree node not associated properly\n" ,
pci_name(dev));
return NULL;
}
if (pdn->pe_number != IODA_INVALID_PE)
return NULL;
pe = pnv_ioda_alloc_pe(phb, 1 );
if (!pe) {
pr_warn("%s: Not enough PE# available, disabling device\n" ,
pci_name(dev));
return NULL;
}
/* NOTE: We don't get a reference for the pointer in the PE
* data structure , both the device and PE structures should be
* destroyed at the same time .
*
* At some point we want to remove the PDN completely anyways
*/
pdn->pe_number = pe->pe_number;
pe->flags = PNV_IODA_PE_DEV;
pe->pdev = dev;
pe->pbus = NULL;
pe->mve_number = -1 ;
pe->rid = dev->bus->number << 8 | pdn->devfn;
pe->device_count++;
pe_info(pe, "Associated device to PE\n" );
if (pnv_ioda_configure_pe(phb, pe)) {
/* XXX What do we do here ? */
pnv_ioda_free_pe(pe);
pdn->pe_number = IODA_INVALID_PE;
pe->pdev = NULL;
return NULL;
}
/* 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);
return pe;
}
/*
* There ' re 2 types of PCI bus sensitive PEs : One that is compromised of
* single PCI bus . Another one that contains the primary PCI bus and its
* subordinate PCI devices and buses . The second type of PE is normally
* orgiriated by PCIe - to - PCI bridge or PLX switch downstream ports .
*/
static struct pnv_ioda_pe *pnv_ioda_setup_bus_PE(struct pci_bus *bus, bool all)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(bus);
struct pnv_ioda_pe *pe = NULL;
unsigned int pe_num;
/*
* In partial hotplug case , the PE instance might be still alive .
* We should reuse it instead of allocating a new one .
*/
pe_num = phb->ioda.pe_rmap[bus->number << 8 ];
if (WARN_ON(pe_num != IODA_INVALID_PE)) {
pe = &phb->ioda.pe_array[pe_num];
return NULL;
}
/* PE number for root bus should have been reserved */
if (pci_is_root_bus(bus))
pe = &phb->ioda.pe_array[phb->ioda.root_pe_idx];
/* Check if PE is determined by M64 */
if (!pe)
pe = pnv_ioda_pick_m64_pe(bus, all);
/* The PE number isn't pinned by M64 */
if (!pe)
pe = pnv_ioda_alloc_pe(phb, 1 );
if (!pe) {
pr_warn("%s: Not enough PE# available for PCI bus %04x:%02x\n" ,
__func__, pci_domain_nr(bus), bus->number);
return NULL;
}
pe->flags |= (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS);
pe->pbus = bus;
pe->pdev = NULL;
pe->mve_number = -1 ;
pe->rid = bus->busn_res.start << 8 ;
if (all)
pe_info(pe, "Secondary bus %pad..%pad associated with PE#%x\n" ,
&bus->busn_res.start, &bus->busn_res.end,
pe->pe_number);
else
pe_info(pe, "Secondary bus %pad associated with PE#%x\n" ,
&bus->busn_res.start, pe->pe_number);
if (pnv_ioda_configure_pe(phb, pe)) {
/* XXX What do we do here ? */
pnv_ioda_free_pe(pe);
pe->pbus = NULL;
return NULL;
}
/* Put PE to the list */
list_add_tail(&pe->list, &phb->ioda.pe_list);
return pe;
}
static void pnv_pci_ioda_dma_dev_setup(struct pci_dev *pdev)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(pdev->bus);
struct pci_dn *pdn = pci_get_pdn(pdev);
struct pnv_ioda_pe *pe;
/* Check if the BDFN for this device is associated with a PE yet */
pe = pnv_pci_bdfn_to_pe(phb, pci_dev_id(pdev));
if (!pe) {
/* VF PEs should be pre-configured in pnv_pci_sriov_enable() */
if (WARN_ON(pdev->is_virtfn))
return ;
pnv_pci_configure_bus(pdev->bus);
pe = pnv_pci_bdfn_to_pe(phb, pci_dev_id(pdev));
pci_info(pdev, "Configured PE#%x\n" , pe ? pe->pe_number : 0 xfffff);
/*
* If we can ' t setup the IODA PE something has gone horribly
* wrong and we can ' t enable DMA for the device .
*/
if (WARN_ON(!pe))
return ;
} else {
pci_info(pdev, "Added to existing PE#%x\n" , pe->pe_number);
}
/*
* We assume that bridges * probably * don ' t need to do any DMA so we can
* skip allocating a TCE table , etc unless we get a non - bridge device .
*/
if (!pe->dma_setup_done && !pci_is_bridge(pdev)) {
switch (phb->type) {
case PNV_PHB_IODA2:
pnv_pci_ioda2_setup_dma_pe(phb, pe);
break ;
default :
pr_warn("%s: No DMA for PHB#%x (type %d)\n" ,
__func__, phb->hose->global_number, phb->type);
}
}
if (pdn)
pdn->pe_number = pe->pe_number;
pe->device_count++;
WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
pdev->dev.archdata.dma_offset = pe->tce_bypass_base;
set_iommu_table_base(&pdev->dev, pe->table_group.tables[0 ]);
/* PEs with a DMA weight of zero won't have a group */
if (pe->table_group.group)
iommu_add_device(&pe->table_group, &pdev->dev);
}
/*
* Reconfigure TVE # 0 to be usable as 64 - bit DMA space .
*
* The first 4 GB of virtual memory for a PE is reserved for 32 - bit accesses .
* Devices can only access more than that if bit 59 of the PCI address is set
* by hardware , which indicates TVE # 1 should be used instead of TVE # 0 .
* Many PCI devices are not capable of addressing that many bits , and as a
* result are limited to the 4 GB of virtual memory made available to 32 - bit
* devices in TVE # 0 .
*
* In order to work around this , reconfigure TVE # 0 to be suitable for 64 - bit
* devices by configuring the virtual memory past the first 4 GB inaccessible
* by 64 - bit DMAs . This should only be used by devices that want more than
* 4 GB , and only on PEs that have no 32 - bit devices .
*
* Currently this will only work on PHB3 ( POWER8 ) .
*/
static int pnv_pci_ioda_dma_64bit_bypass(struct pnv_ioda_pe *pe)
{
u64 window_size, table_size, tce_count, addr;
struct page *table_pages;
u64 tce_order = 28 ; /* 256MB TCEs */
__be64 *tces;
s64 rc;
/*
* Window size needs to be a power of two , but needs to account for
* shifting memory by the 4 GB offset required to skip 32 bit space .
*/
window_size = roundup_pow_of_two(memory_hotplug_max() + (1 ULL << 32 ));
tce_count = window_size >> tce_order;
table_size = tce_count << 3 ;
if (table_size < PAGE_SIZE)
table_size = PAGE_SIZE;
table_pages = alloc_pages_node(pe->phb->hose->node, GFP_KERNEL,
get_order(table_size));
if (!table_pages)
goto err;
tces = page_address(table_pages);
if (!tces)
goto err;
memset(tces, 0 , table_size);
for (addr = 0 ; addr < memory_hotplug_max(); addr += (1 << tce_order)) {
tces[(addr + (1 ULL << 32 )) >> tce_order] =
cpu_to_be64(addr | TCE_PCI_READ | TCE_PCI_WRITE);
}
rc = opal_pci_map_pe_dma_window(pe->phb->opal_id,
pe->pe_number,
/* reconfigure window 0 */
(pe->pe_number << 1 ) + 0 ,
1 ,
__pa(tces),
table_size,
1 << tce_order);
if (rc == OPAL_SUCCESS) {
pe_info(pe, "Using 64-bit DMA iommu bypass (through TVE#0)\n" );
return 0 ;
}
err:
pe_err(pe, "Error configuring 64-bit DMA bypass\n" );
return -EIO;
}
static bool pnv_pci_ioda_iommu_bypass_supported(struct pci_dev *pdev,
u64 dma_mask)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(pdev->bus);
struct pci_dn *pdn = pci_get_pdn(pdev);
struct pnv_ioda_pe *pe;
if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
return false ;
pe = &phb->ioda.pe_array[pdn->pe_number];
if (pe->tce_bypass_enabled) {
u64 top = pe->tce_bypass_base + memblock_end_of_DRAM() - 1 ;
if (dma_mask >= top)
return true ;
}
/*
* If the device can ' t set the TCE bypass bit but still wants
* to access 4 GB or more , on PHB3 we can reconfigure TVE # 0 to
* bypass the 32 - bit region and be usable for 64 - bit DMAs .
* The device needs to be able to address all of this space .
*/
if (dma_mask >> 32 &&
dma_mask > (memory_hotplug_max() + (1 ULL << 32 )) &&
/* pe->pdev should be set if it's a single device, pe->pbus if not */
(pe->device_count == 1 || !pe->pbus) &&
phb->model == PNV_PHB_MODEL_PHB3) {
/* Configure the bypass mode */
s64 rc = pnv_pci_ioda_dma_64bit_bypass(pe);
if (rc)
return false ;
/* 4GB offset bypasses 32-bit space */
pdev->dev.archdata.dma_offset = (1 ULL << 32 );
return true ;
}
return false ;
}
static inline __be64 __iomem *pnv_ioda_get_inval_reg(struct pnv_phb *phb)
{
return phb->regs + 0 x210;
}
#ifdef CONFIG_IOMMU_API
/* Common for IODA1 and IODA2 */
static int pnv_ioda_tce_xchg_no_kill(struct iommu_table *tbl, long index,
unsigned long *hpa, enum dma_data_direction *direction)
{
return pnv_tce_xchg(tbl, index, hpa, direction);
}
#endif
#define PHB3_TCE_KILL_INVAL_ALL PPC_BIT(0 )
#define PHB3_TCE_KILL_INVAL_PE PPC_BIT(1 )
#define PHB3_TCE_KILL_INVAL_ONE PPC_BIT(2 )
static inline void pnv_pci_phb3_tce_invalidate_pe(struct pnv_ioda_pe *pe)
{
/* 01xb - invalidate TCEs that match the specified PE# */
__be64 __iomem *invalidate = pnv_ioda_get_inval_reg(pe->phb);
unsigned long val = PHB3_TCE_KILL_INVAL_PE | (pe->pe_number & 0 xFF);
mb(); /* Ensure above stores are visible */
__raw_writeq_be(val, invalidate);
}
static void pnv_pci_phb3_tce_invalidate(struct pnv_ioda_pe *pe,
unsigned shift, unsigned long index,
unsigned long npages)
{
__be64 __iomem *invalidate = pnv_ioda_get_inval_reg(pe->phb);
unsigned long start, end, inc;
/* We'll invalidate DMA address in PE scope */
start = PHB3_TCE_KILL_INVAL_ONE;
start |= (pe->pe_number & 0 xFF);
end = start;
/* Figure out the start, end and step */
start |= (index << shift);
end |= ((index + npages - 1 ) << shift);
inc = (0 x1ull << shift);
mb();
while (start <= end) {
__raw_writeq_be(start, invalidate);
start += inc;
}
}
static inline void pnv_pci_ioda2_tce_invalidate_pe(struct pnv_ioda_pe *pe)
{
struct pnv_phb *phb = pe->phb;
if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
pnv_pci_phb3_tce_invalidate_pe(pe);
else
opal_pci_tce_kill(phb->opal_id, OPAL_PCI_TCE_KILL_PE,
pe->pe_number, 0 , 0 , 0 );
}
static void pnv_pci_ioda2_tce_invalidate(struct iommu_table *tbl,
unsigned long index, unsigned long npages)
{
struct iommu_table_group_link *tgl;
list_for_each_entry_lockless(tgl, &tbl->it_group_list, next) {
struct pnv_ioda_pe *pe = container_of(tgl->table_group,
struct pnv_ioda_pe, table_group);
struct pnv_phb *phb = pe->phb;
unsigned int shift = tbl->it_page_shift;
if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
pnv_pci_phb3_tce_invalidate(pe, shift,
index, npages);
else
opal_pci_tce_kill(phb->opal_id,
OPAL_PCI_TCE_KILL_PAGES,
pe->pe_number, 1 u << shift,
index << shift, npages);
}
}
static int pnv_ioda2_tce_build(struct iommu_table *tbl, long index,
long npages, unsigned long uaddr,
enum dma_data_direction direction,
unsigned long attrs)
{
int ret = pnv_tce_build(tbl, index, npages, uaddr, direction,
attrs);
if (!ret)
pnv_pci_ioda2_tce_invalidate(tbl, index, npages);
return ret;
}
static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index,
long npages)
{
pnv_tce_free(tbl, index, npages);
pnv_pci_ioda2_tce_invalidate(tbl, index, npages);
}
static struct iommu_table_ops pnv_ioda2_iommu_ops = {
.set = pnv_ioda2_tce_build,
#ifdef CONFIG_IOMMU_API
.xchg_no_kill = pnv_ioda_tce_xchg_no_kill,
.tce_kill = pnv_pci_ioda2_tce_invalidate,
.useraddrptr = pnv_tce_useraddrptr,
#endif
.clear = pnv_ioda2_tce_free,
.get = pnv_tce_get,
.free = pnv_pci_ioda2_table_free_pages,
};
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=%lx\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 %lld\n" , rc);
return rc;
}
pnv_pci_link_table_and_group(phb->hose->node, num,
tbl, &pe->table_group);
pnv_pci_ioda2_tce_invalidate_pe(pe);
return 0 ;
}
static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable)
{
uint16_t window_id = (pe->pe_number << 1 ) + 1 ;
int64_t rc;
pe_info(pe, "%sabling 64-bit DMA bypass\n" , enable ? "En" : "Dis" );
if (enable) {
phys_addr_t top = memblock_end_of_DRAM();
top = roundup_pow_of_two(top);
rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
pe->pe_number,
window_id,
pe->tce_bypass_base,
top);
} else {
rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
pe->pe_number,
window_id,
pe->tce_bypass_base,
0 );
}
if (rc)
pe_err(pe, "OPAL error %lld configuring bypass window\n" , rc);
else
pe->tce_bypass_enabled = enable;
}
static long pnv_pci_ioda2_create_table(struct iommu_table_group *table_group,
int num, __u32 page_shift, __u64 window_size, __u32 levels,
bool alloc_userspace_copy, 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;
tbl->it_ops = &pnv_ioda2_iommu_ops;
ret = pnv_pci_ioda2_table_alloc_pages(nid,
bus_offset, page_shift, window_size,
levels, alloc_userspace_copy, tbl);
if (ret) {
iommu_tce_table_put(tbl);
return ret;
}
*ptbl = tbl;
return 0 ;
}
static long pnv_pci_ioda2_setup_default_config(struct pnv_ioda_pe *pe)
{
struct iommu_table *tbl = NULL;
long rc;
unsigned long res_start, res_end;
/*
* crashkernel = specifies the kdump kernel ' s maximum memory at
* some offset and there is no guaranteed the result is a power
* of 2 , which will cause errors later .
*/
const u64 max_memory = __rounddown_pow_of_two(memory_hotplug_max());
/*
* In memory constrained environments , e . g . kdump kernel , the
* DMA window can be larger than available memory , which will
* cause errors later .
*/
const u64 maxblock = 1 UL << (PAGE_SHIFT + MAX_PAGE_ORDER);
/*
* We create the default window as big as we can . The constraint is
* the max order of allocation possible . The TCE table is likely to
* end up being multilevel and with on - demand allocation in place ,
* the initial use is not going to be huge as the default window aims
* to support crippled devices ( i . e . not fully 64 bit DMAble ) only .
*/
/* iommu_table::it_map uses 1 bit per IOMMU page, hence 8 */
const u64 window_size = min((maxblock * 8 ) << PAGE_SHIFT, max_memory);
/* Each TCE level cannot exceed maxblock so go multilevel if needed */
unsigned long tces_order = ilog2(window_size >> PAGE_SHIFT);
unsigned long tcelevel_order = ilog2(maxblock >> 3 );
unsigned int levels = tces_order / tcelevel_order;
if (tces_order % tcelevel_order)
levels += 1 ;
/*
* We try to stick to default levels ( which is > 1 at the moment ) in
* order to save memory by relying on on - demain TCE level allocation .
*/
levels = max_t(unsigned int , levels, POWERNV_IOMMU_DEFAULT_LEVELS);
rc = pnv_pci_ioda2_create_table(&pe->table_group, 0 , PAGE_SHIFT,
window_size, levels, false , &tbl);
if (rc) {
pe_err(pe, "Failed to create 32-bit TCE table, err %ld" ,
rc);
return rc;
}
/* We use top part of 32bit space for MMIO so exclude it from DMA */
res_start = 0 ;
res_end = 0 ;
if (window_size > pe->phb->ioda.m32_pci_base) {
res_start = pe->phb->ioda.m32_pci_base >> tbl->it_page_shift;
res_end = min(window_size, SZ_4G) >> tbl->it_page_shift;
}
tbl->it_index = (pe->phb->hose->global_number << 16 ) | pe->pe_number;
if (iommu_init_table(tbl, pe->phb->hose->node, res_start, res_end))
rc = pnv_pci_ioda2_set_window(&pe->table_group, 0 , tbl);
else
rc = -ENOMEM;
if (rc) {
pe_err(pe, "Failed to configure 32-bit TCE table, err %ld\n" , rc);
iommu_tce_table_put(tbl);
tbl = NULL; /* This clears iommu_table_base below */
}
if (!pnv_iommu_bypass_disabled)
pnv_pci_ioda2_set_bypass(pe, true );
/*
* Set table base for the case of IOMMU DMA use . Usually this is done
* from dma_dev_setup ( ) which is not called when a device is returned
* from VFIO so do it here .
*/
if (pe->pdev)
set_iommu_table_base(&pe->pdev->dev, tbl);
return 0 ;
}
static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group,
int num)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
table_group);
struct pnv_phb *phb = pe->phb;
long ret;
pe_info(pe, "Removing DMA window #%d\n" , num);
ret = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
(pe->pe_number << 1 ) + num,
0 /* levels */, 0/* table address */,
0 /* table size */, 0/* page size */);
if (ret)
pe_warn(pe, "Unmapping failed, ret = %ld\n" , ret);
else
pnv_pci_ioda2_tce_invalidate_pe(pe);
pnv_pci_unlink_table_and_group(table_group->tables[num], table_group);
return ret;
}
#ifdef CONFIG_IOMMU_API
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(0 x1000UL, 1 UL << table_shift);
unsigned long direct_table_size;
if (!levels || (levels > POWERNV_IOMMU_MAX_LEVELS) ||
!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 = 1 UL << table_shift;
for ( ; levels; --levels) {
bytes += ALIGN(tce_table_size, direct_table_size);
tce_table_size /= direct_table_size;
tce_table_size <<= 3 ;
tce_table_size = max_t(unsigned long ,
tce_table_size, direct_table_size);
}
return bytes + bytes; /* one for HW table, one for userspace copy */
}
static long pnv_pci_ioda2_create_table_userspace(
struct iommu_table_group *table_group,
int num, __u32 page_shift, __u64 window_size, __u32 levels,
struct iommu_table **ptbl)
{
long ret = pnv_pci_ioda2_create_table(table_group,
num, page_shift, window_size, levels, true , ptbl);
if (!ret)
(*ptbl)->it_allocated_size = pnv_pci_ioda2_get_table_size(
page_shift, window_size, levels);
return ret;
}
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 ]);
dev->dev.archdata.dma_offset = pe->tce_bypass_base;
if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
pnv_ioda_setup_bus_dma(pe, dev->subordinate);
}
}
static long pnv_ioda2_take_ownership(struct iommu_table_group *table_group,
struct device *dev __maybe_unused)
{
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 ];
/*
* iommu_ops transfers the ownership per a device and we mode
* the group ownership with the first device in the group .
*/
if (!tbl)
return 0 ;
pnv_pci_ioda2_set_bypass(pe, false );
pnv_pci_ioda2_unset_window(&pe->table_group, 0 );
if (pe->pbus)
pnv_ioda_setup_bus_dma(pe, pe->pbus);
else if (pe->pdev)
set_iommu_table_base(&pe->pdev->dev, NULL);
iommu_tce_table_put(tbl);
return 0 ;
}
static void pnv_ioda2_release_ownership(struct iommu_table_group *table_group,
struct device *dev __maybe_unused)
{
struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe,
table_group);
/* See the comment about iommu_ops above */
if (pe->table_group.tables[0 ])
return ;
pnv_pci_ioda2_setup_default_config(pe);
if (pe->pbus)
pnv_ioda_setup_bus_dma(pe, pe->pbus);
}
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_userspace,
.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
void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
struct pnv_ioda_pe *pe)
{
int64_t rc;
/* TVE #1 is selected by PCI address bit 59 */
pe->tce_bypass_base = 1 ull << 59 ;
/* The PE will reserve all possible 32-bits space */
pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n" ,
phb->ioda.m32_pci_base);
/* Setup linux iommu table */
pe->table_group.tce32_start = 0 ;
pe->table_group.tce32_size = phb->ioda.m32_pci_base;
pe->table_group.max_dynamic_windows_supported =
IOMMU_TABLE_GROUP_MAX_TABLES;
pe->table_group.max_levels = POWERNV_IOMMU_MAX_LEVELS;
pe->table_group.pgsizes = pnv_ioda_parse_tce_sizes(phb);
rc = pnv_pci_ioda2_setup_default_config(pe);
if (rc)
return ;
#ifdef CONFIG_IOMMU_API
pe->table_group.ops = &pnv_pci_ioda2_ops;
iommu_register_group(&pe->table_group, phb->hose->global_number,
pe->pe_number);
#endif
pe->dma_setup_done = true ;
}
/*
* Called from KVM in real mode to EOI passthru interrupts . The ICP
* EOI is handled directly in KVM in kvmppc_deliver_irq_passthru ( ) .
*
* The IRQ data is mapped in the PCI - MSI domain and the EOI OPAL call
* needs an HW IRQ number mapped in the XICS IRQ domain . The HW IRQ
* numbers of the in - the - middle MSI domain are vector numbers and it ' s
* good enough for OPAL . Use that .
*/
int64_t pnv_opal_pci_msi_eoi(struct irq_data *d)
{
struct pci_controller *hose = irq_data_get_irq_chip_data(d->parent_data);
struct pnv_phb *phb = hose->private_data;
return opal_pci_msi_eoi(phb->opal_id, d->parent_data->hwirq);
}
static struct irq_chip pnv_pci_msi_irq_chip;
/*
* Returns true iff chip is something that we could call
* pnv_opal_pci_msi_eoi for .
*/
bool is_pnv_opal_msi(struct irq_chip *chip)
{
return chip == &pnv_pci_msi_irq_chip;
}
EXPORT_SYMBOL_GPL(is_pnv_opal_msi);
static int __pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
unsigned int xive_num,
unsigned int is_64, struct msi_msg *msg)
{
struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
__be32 data;
int rc;
dev_dbg(&dev->dev, "%s: setup %s-bit MSI for vector #%d\n" , __func__,
is_64 ? "64" : "32" , xive_num);
/* No PE assigned ? bail out ... no MSI for you ! */
if (pe == NULL)
return -ENXIO;
/* Check if we have an MVE */
if (pe->mve_number < 0 )
return -ENXIO;
/* Force 32-bit MSI on some broken devices */
if (dev->no_64bit_msi)
is_64 = 0 ;
/* Assign XIVE to PE */
rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
if (rc) {
pr_warn("%s: OPAL error %d setting XIVE %d PE\n" ,
pci_name(dev), rc, xive_num);
return -EIO;
}
if (is_64) {
__be64 addr64;
rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1 ,
&addr64, &data);
if (rc) {
pr_warn("%s: OPAL error %d getting 64-bit MSI data\n" ,
pci_name(dev), rc);
return -EIO;
}
msg->address_hi = be64_to_cpu(addr64) >> 32 ;
msg->address_lo = be64_to_cpu(addr64) & 0 xfffffffful;
} else {
__be32 addr32;
rc = opal_get_msi_32(phb->opal_id, pe->mve_number, xive_num, 1 ,
&addr32, &data);
if (rc) {
pr_warn("%s: OPAL error %d getting 32-bit MSI data\n" ,
pci_name(dev), rc);
return -EIO;
}
msg->address_hi = 0 ;
msg->address_lo = be32_to_cpu(addr32);
}
msg->data = be32_to_cpu(data);
return 0 ;
}
/*
* The msi_free ( ) op is called before irq_domain_free_irqs_top ( ) when
* the handler data is still available . Use that to clear the XIVE
* controller .
*/
static void pnv_msi_ops_msi_free(struct irq_domain *domain,
struct msi_domain_info *info,
unsigned int irq)
{
if (xive_enabled())
xive_irq_free_data(irq);
}
static struct msi_domain_ops pnv_pci_msi_domain_ops = {
.msi_free = pnv_msi_ops_msi_free,
};
static void pnv_msi_shutdown(struct irq_data *d)
{
d = d->parent_data;
if (d->chip->irq_shutdown)
d->chip->irq_shutdown(d);
}
static void pnv_msi_mask(struct irq_data *d)
{
pci_msi_mask_irq(d);
irq_chip_mask_parent(d);
}
static void pnv_msi_unmask(struct irq_data *d)
{
pci_msi_unmask_irq(d);
irq_chip_unmask_parent(d);
}
static struct irq_chip pnv_pci_msi_irq_chip = {
.name = "PNV-PCI-MSI" ,
.irq_shutdown = pnv_msi_shutdown,
.irq_mask = pnv_msi_mask,
.irq_unmask = pnv_msi_unmask,
.irq_eoi = irq_chip_eoi_parent,
};
static struct msi_domain_info pnv_msi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
.ops = &pnv_pci_msi_domain_ops,
.chip = &pnv_pci_msi_irq_chip,
};
static void pnv_msi_compose_msg(struct irq_data *d, struct msi_msg *msg)
{
struct msi_desc *entry = irq_data_get_msi_desc(d);
struct pci_dev *pdev = msi_desc_to_pci_dev(entry);
struct pci_controller *hose = irq_data_get_irq_chip_data(d);
struct pnv_phb *phb = hose->private_data;
int rc;
rc = __pnv_pci_ioda_msi_setup(phb, pdev, d->hwirq,
entry->pci.msi_attrib.is_64, msg);
if (rc)
dev_err(&pdev->dev, "Failed to setup %s-bit MSI #%ld : %d\n" ,
entry->pci.msi_attrib.is_64 ? "64" : "32" , d->hwirq, rc);
}
/*
* The IRQ data is mapped in the MSI domain in which HW IRQ numbers
* correspond to vector numbers .
*/
static void pnv_msi_eoi(struct irq_data *d)
{
struct pci_controller *hose = irq_data_get_irq_chip_data(d);
struct pnv_phb *phb = hose->private_data;
if (phb->model == PNV_PHB_MODEL_PHB3) {
/*
* The EOI OPAL call takes an OPAL HW IRQ number but
* since it is translated into a vector number in
* OPAL , use that directly .
*/
WARN_ON_ONCE(opal_pci_msi_eoi(phb->opal_id, d->hwirq));
}
irq_chip_eoi_parent(d);
}
static struct irq_chip pnv_msi_irq_chip = {
.name = "PNV-MSI" ,
.irq_shutdown = pnv_msi_shutdown,
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = pnv_msi_eoi,
.irq_set_affinity = irq_chip_set_affinity_parent,
.irq_compose_msi_msg = pnv_msi_compose_msg,
};
static int pnv_irq_parent_domain_alloc(struct irq_domain *domain,
unsigned int virq, int hwirq)
{
struct irq_fwspec parent_fwspec;
int ret;
parent_fwspec.fwnode = domain->parent->fwnode;
parent_fwspec.param_count = 2 ;
parent_fwspec.param[0 ] = hwirq;
parent_fwspec.param[1 ] = IRQ_TYPE_EDGE_RISING;
ret = irq_domain_alloc_irqs_parent(domain, virq, 1 , &parent_fwspec);
if (ret)
return ret;
return 0 ;
}
static int pnv_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
struct pci_controller *hose = domain->host_data;
struct pnv_phb *phb = hose->private_data;
msi_alloc_info_t *info = arg;
struct pci_dev *pdev = msi_desc_to_pci_dev(info->desc);
int hwirq;
int i, ret;
hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, nr_irqs);
if (hwirq < 0 ) {
dev_warn(&pdev->dev, "failed to find a free MSI\n" );
return -ENOSPC;
}
dev_dbg(&pdev->dev, "%s bridge %pOF %d/%x #%d\n" , __func__,
hose->dn, virq, hwirq, nr_irqs);
for (i = 0 ; i < nr_irqs; i++) {
ret = pnv_irq_parent_domain_alloc(domain, virq + i,
phb->msi_base + hwirq + i);
if (ret)
goto out;
irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
&pnv_msi_irq_chip, hose);
}
return 0 ;
out:
irq_domain_free_irqs_parent(domain, virq, i);
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, nr_irqs);
return ret;
}
static void pnv_irq_domain_free(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs)
{
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
struct pci_controller *hose = irq_data_get_irq_chip_data(d);
struct pnv_phb *phb = hose->private_data;
pr_debug("%s bridge %pOF %d/%lx #%d\n" , __func__, hose->dn,
virq, d->hwirq, nr_irqs);
msi_bitmap_free_hwirqs(&phb->msi_bmp, d->hwirq, nr_irqs);
/* XIVE domain is cleared through ->msi_free() */
}
static const struct irq_domain_ops pnv_irq_domain_ops = {
.alloc = pnv_irq_domain_alloc,
.free = pnv_irq_domain_free,
};
static int __init pnv_msi_allocate_domains(struct pci_controller *hose, unsigned int count)
{
struct pnv_phb *phb = hose->private_data;
struct irq_domain *parent = irq_get_default_domain();
hose->fwnode = irq_domain_alloc_named_id_fwnode("PNV-MSI" , phb->opal_id);
if (!hose->fwnode)
return -ENOMEM;
hose->dev_domain = irq_domain_create_hierarchy(parent, 0 , count,
hose->fwnode,
&pnv_irq_domain_ops, hose);
if (!hose->dev_domain) {
pr_err("PCI: failed to create IRQ domain bridge %pOF (domain %d)\n" ,
hose->dn, hose->global_number);
irq_domain_free_fwnode(hose->fwnode);
return -ENOMEM;
}
hose->msi_domain = pci_msi_create_irq_domain(of_fwnode_handle(hose->dn),
&pnv_msi_domain_info,
hose->dev_domain);
if (!hose->msi_domain) {
pr_err("PCI: failed to create MSI IRQ domain bridge %pOF (domain %d)\n" ,
hose->dn, hose->global_number);
irq_domain_free_fwnode(hose->fwnode);
irq_domain_remove(hose->dev_domain);
return -ENOMEM;
}
return 0 ;
}
static void __init 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 ;
}
pr_info(" Allocated bitmap for %d MSIs (base IRQ 0x%x)\n" ,
count, phb->msi_base);
pnv_msi_allocate_domains(phb->hose, count);
}
static void pnv_ioda_setup_pe_res(struct pnv_ioda_pe *pe,
struct resource *res)
{
struct pnv_phb *phb = pe->phb;
struct pci_bus_region region;
int index;
int64_t rc;
if (!res || !res->flags || res->start > res->end ||
res->flags & IORESOURCE_UNSET)
return ;
if (res->flags & IORESOURCE_IO) {
region.start = res->start - phb->ioda.io_pci_base;
region.end = res->end - phb->ioda.io_pci_base;
index = region.start / phb->ioda.io_segsize;
while (index < phb->ioda.total_pe_num &&
region.start <= region.end) {
phb->ioda.io_segmap[index] = pe->pe_number;
rc = opal_pci_map_pe_mmio_window(phb->opal_id,
pe->pe_number, OPAL_IO_WINDOW_TYPE, 0 , index);
if (rc != OPAL_SUCCESS) {
pr_err("%s: Error %lld mapping IO segment#%d to PE#%x\n" ,
__func__, rc, index, pe->pe_number);
break ;
}
region.start += phb->ioda.io_segsize;
index++;
}
} else if ((res->flags & IORESOURCE_MEM) &&
!pnv_pci_is_m64(phb, res)) {
region.start = res->start -
phb->hose->mem_offset[0 ] -
phb->ioda.m32_pci_base;
region.end = res->end -
phb->hose->mem_offset[0 ] -
phb->ioda.m32_pci_base;
index = region.start / phb->ioda.m32_segsize;
while (index < phb->ioda.total_pe_num &&
region.start <= region.end) {
phb->ioda.m32_segmap[index] = pe->pe_number;
rc = opal_pci_map_pe_mmio_window(phb->opal_id,
pe->pe_number, OPAL_M32_WINDOW_TYPE, 0 , index);
if (rc != OPAL_SUCCESS) {
pr_err("%s: Error %lld mapping M32 segment#%d to PE#%x" ,
__func__, rc, index, pe->pe_number);
break ;
}
region.start += phb->ioda.m32_segsize;
index++;
}
}
}
/*
* This function is supposed to be called on basis of PE from top
* to bottom style . So the I / O or MMIO segment assigned to
* parent PE could be overridden by its child PEs if necessary .
*/
static void pnv_ioda_setup_pe_seg(struct pnv_ioda_pe *pe)
{
struct pci_dev *pdev;
int i;
/*
* NOTE : We only care PCI bus based PE for now . For PCI
* device based PE , for example SRIOV sensitive VF should
* be figured out later .
*/
BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)));
list_for_each_entry(pdev, &pe->pbus->devices, bus_list) {
for (i = 0 ; i <= PCI_ROM_RESOURCE; i++)
pnv_ioda_setup_pe_res(pe, &pdev->resource[i]);
/*
* If the PE contains all subordinate PCI buses , the
* windows of the child bridges should be mapped to
* the PE as well .
*/
if (!(pe->flags & PNV_IODA_PE_BUS_ALL) || !pci_is_bridge(pdev))
continue ;
for (i = 0 ; i < PCI_BRIDGE_RESOURCE_NUM; i++)
pnv_ioda_setup_pe_res(pe,
&pdev->resource[PCI_BRIDGE_RESOURCES + i]);
}
}
#ifdef CONFIG_DEBUG_FS
static int pnv_pci_diag_data_set(void *data, u64 val)
{
struct pnv_phb *phb = data;
s64 ret;
/* Retrieve the diag data from firmware */
ret = opal_pci_get_phb_diag_data2(phb->opal_id, phb->diag_data,
phb->diag_data_size);
if (ret != OPAL_SUCCESS)
return -EIO;
/* Print the diag data to the kernel log */
pnv_pci_dump_phb_diag_data(phb->hose, phb->diag_data);
return 0 ;
}
DEFINE_DEBUGFS_ATTRIBUTE(pnv_pci_diag_data_fops, NULL, pnv_pci_diag_data_set,
"%llu\n" );
static int pnv_pci_ioda_pe_dump(void *data, u64 val)
{
struct pnv_phb *phb = data;
int pe_num;
for (pe_num = 0 ; pe_num < phb->ioda.total_pe_num; pe_num++) {
struct pnv_ioda_pe *pe = &phb->ioda.pe_array[pe_num];
if (!test_bit(pe_num, phb->ioda.pe_alloc))
continue ;
pe_warn(pe, "rid: %04x dev count: %2d flags: %s%s%s%s%s%s\n" ,
pe->rid, pe->device_count,
(pe->flags & PNV_IODA_PE_DEV) ? "dev " : "" ,
(pe->flags & PNV_IODA_PE_BUS) ? "bus " : "" ,
(pe->flags & PNV_IODA_PE_BUS_ALL) ? "all " : "" ,
(pe->flags & PNV_IODA_PE_MASTER) ? "master " : "" ,
(pe->flags & PNV_IODA_PE_SLAVE) ? "slave " : "" ,
(pe->flags & PNV_IODA_PE_VF) ? "vf " : "" );
}
return 0 ;
}
DEFINE_DEBUGFS_ATTRIBUTE(pnv_pci_ioda_pe_dump_fops, NULL,
pnv_pci_ioda_pe_dump, "%llu\n" );
#endif /* CONFIG_DEBUG_FS */
static void pnv_pci_ioda_create_dbgfs(void )
{
#ifdef CONFIG_DEBUG_FS
struct pci_controller *hose, *tmp;
struct pnv_phb *phb;
char name[16 ];
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
phb = hose->private_data;
sprintf(name, "PCI%04x" , hose->global_number);
phb->dbgfs = debugfs_create_dir(name, arch_debugfs_dir);
debugfs_create_file_unsafe("dump_diag_regs" , 0200 , phb->dbgfs,
phb, &pnv_pci_diag_data_fops);
debugfs_create_file_unsafe("dump_ioda_pe_state" , 0200 , phb->dbgfs,
phb, &pnv_pci_ioda_pe_dump_fops);
}
#endif /* CONFIG_DEBUG_FS */
}
static void pnv_pci_enable_bridge(struct pci_bus *bus)
{
struct pci_dev *dev = bus->self;
struct pci_bus *child;
/* Empty bus ? bail */
if (list_empty(&bus->devices))
return ;
/*
* If there ' s a bridge associated with that bus enable it . This works
* around races in the generic code if the enabling is done during
* parallel probing . This can be removed once those races have been
* fixed .
*/
if (dev) {
int rc = pci_enable_device(dev);
if (rc)
pci_err(dev, "Error enabling bridge (%d)\n" , rc);
pci_set_master(dev);
}
/* Perform the same to child busses */
list_for_each_entry(child, &bus->children, node)
pnv_pci_enable_bridge(child);
}
static void pnv_pci_enable_bridges(void )
{
struct pci_controller *hose;
list_for_each_entry(hose, &hose_list, list_node)
pnv_pci_enable_bridge(hose->bus);
}
static void pnv_pci_ioda_fixup(void )
{
pnv_pci_ioda_create_dbgfs();
pnv_pci_enable_bridges();
#ifdef CONFIG_EEH
pnv_eeh_post_init();
#endif
}
/*
* Returns the alignment for I / O or memory windows for P2P
* bridges . That actually depends on how PEs are segmented .
* For now , we return I / O or M32 segment size for PE sensitive
* P2P bridges . Otherwise , the default values ( 4 KiB for I / O ,
* 1 MiB 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 pnv_phb *phb = pci_bus_to_pnvhb(bus);
int num_pci_bridges = 0 ;
struct pci_dev *bridge;
bridge = bus->self;
while (bridge) {
if (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE) {
num_pci_bridges++;
if (num_pci_bridges >= 2 )
return 1 ;
}
bridge = bridge->bus->self;
}
/*
* We fall back to M32 if M64 isn ' t supported . We enforce the M64
* alignment for any 64 - bit resource , PCIe doesn ' t care and
* bridges only do 64 - bit prefetchable anyway .
*/
if (phb->ioda.m64_segsize && pnv_pci_is_m64_flags(type))
return phb->ioda.m64_segsize;
if (type & IORESOURCE_MEM)
return phb->ioda.m32_segsize;
return phb->ioda.io_segsize;
}
/*
* We are updating root port or the upstream port of the
* bridge behind the root port with PHB ' s windows in order
* to accommodate the changes on required resources during
* PCI ( slot ) hotplug , which is connected to either root
* port or the downstream ports of PCIe switch behind the
* root port .
*/
static void pnv_pci_fixup_bridge_resources(struct pci_bus *bus,
unsigned long type)
{
struct pci_controller *hose = pci_bus_to_host(bus);
struct pnv_phb *phb = hose->private_data;
struct pci_dev *bridge = bus->self;
struct resource *r, *w;
bool msi_region = false ;
int i;
/* Check if we need apply fixup to the bridge's windows */
if (!pci_is_root_bus(bridge->bus) &&
!pci_is_root_bus(bridge->bus->self->bus))
return ;
/* Fixup the resources */
for (i = 0 ; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
r = &bridge->resource[PCI_BRIDGE_RESOURCES + i];
if (!r->flags || !r->parent)
continue ;
w = NULL;
if (r->flags & type & IORESOURCE_IO)
w = &hose->io_resource;
else if (pnv_pci_is_m64(phb, r) &&
(type & IORESOURCE_PREFETCH) &&
phb->ioda.m64_segsize)
w = &hose->mem_resources[1 ];
else if (r->flags & type & IORESOURCE_MEM) {
w = &hose->mem_resources[0 ];
msi_region = true ;
}
r->start = w->start;
r->end = w->end;
/* The 64KB 32-bits MSI region shouldn't be included in
* the 32 - bits bridge window . Otherwise , we can see strange
* issues . One of them is EEH error observed on Garrison .
*
* Exclude top 1 MB region which is the minimal alignment of
* 32 - bits bridge window .
*/
if (msi_region) {
r->end += 0 x10000;
r->end -= 0 x100000;
}
}
}
static void pnv_pci_configure_bus(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
struct pnv_ioda_pe *pe;
bool all = (bridge && pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE);
dev_info(&bus->dev, "Configuring PE for bus\n" );
/* Don't assign PE to PCI bus, which doesn't have subordinate devices */
if (WARN_ON(list_empty(&bus->devices)))
return ;
/* Reserve PEs according to used M64 resources */
pnv_ioda_reserve_m64_pe(bus, NULL, all);
/*
* Assign PE . We might run here because of partial hotplug .
* For the case , we just pick up the existing PE and should
* not allocate resources again .
*/
pe = pnv_ioda_setup_bus_PE(bus, all);
if (!pe)
return ;
pnv_ioda_setup_pe_seg(pe);
}
static resource_size_t pnv_pci_default_alignment(void )
{
return PAGE_SIZE;
}
/* Prevent enabling devices for which we couldn't properly
* assign a PE
*/
static bool pnv_pci_enable_device_hook(struct pci_dev *dev)
{
struct pci_dn *pdn;
pdn = pci_get_pdn(dev);
if (!pdn || pdn->pe_number == IODA_INVALID_PE) {
pci_err(dev, "pci_enable_device() blocked, no PE assigned.\n" );
return false ;
}
return true ;
}
static bool pnv_ocapi_enable_device_hook(struct pci_dev *dev)
{
struct pci_dn *pdn;
struct pnv_ioda_pe *pe;
pdn = pci_get_pdn(dev);
if (!pdn)
return false ;
if (pdn->pe_number == IODA_INVALID_PE) {
pe = pnv_ioda_setup_dev_PE(dev);
if (!pe)
return false ;
}
return true ;
}
void pnv_pci_ioda2_release_pe_dma(struct pnv_ioda_pe *pe)
{
struct iommu_table *tbl = pe->table_group.tables[0 ];
int64_t rc;
if (!pe->dma_setup_done)
return ;
rc = pnv_pci_ioda2_unset_window(&pe->table_group, 0 );
if (rc)
pe_warn(pe, "OPAL error %lld release DMA window\n" , rc);
pnv_pci_ioda2_set_bypass(pe, false );
if (pe->table_group.group) {
iommu_group_put(pe->table_group.group);
WARN_ON(pe->table_group.group);
}
iommu_tce_table_put(tbl);
}
static void pnv_ioda_free_pe_seg(struct pnv_ioda_pe *pe,
unsigned short win,
unsigned int *map)
{
struct pnv_phb *phb = pe->phb;
int idx;
int64_t rc;
for (idx = 0 ; idx < phb->ioda.total_pe_num; idx++) {
if (map[idx] != pe->pe_number)
continue ;
rc = opal_pci_map_pe_mmio_window(phb->opal_id,
phb->ioda.reserved_pe_idx, win, 0 , idx);
if (rc != OPAL_SUCCESS)
pe_warn(pe, "Error %lld unmapping (%d) segment#%d\n" ,
rc, win, idx);
map[idx] = IODA_INVALID_PE;
}
}
static void pnv_ioda_release_pe_seg(struct pnv_ioda_pe *pe)
{
struct pnv_phb *phb = pe->phb;
if (phb->type == PNV_PHB_IODA2) {
pnv_ioda_free_pe_seg(pe, OPAL_M32_WINDOW_TYPE,
phb->ioda.m32_segmap);
}
}
static void pnv_ioda_release_pe(struct pnv_ioda_pe *pe)
{
struct pnv_phb *phb = pe->phb;
struct pnv_ioda_pe *slave, *tmp;
pe_info(pe, "Releasing PE\n" );
mutex_lock(&phb->ioda.pe_list_mutex);
list_del(&pe->list);
mutex_unlock(&phb->ioda.pe_list_mutex);
switch (phb->type) {
case PNV_PHB_IODA2:
pnv_pci_ioda2_release_pe_dma(pe);
break ;
case PNV_PHB_NPU_OCAPI:
break ;
default :
WARN_ON(1 );
}
pnv_ioda_release_pe_seg(pe);
pnv_ioda_deconfigure_pe(pe->phb, pe);
/* Release slave PEs in the compound PE */
if (pe->flags & PNV_IODA_PE_MASTER) {
list_for_each_entry_safe(slave, tmp, &pe->slaves, list) {
list_del(&slave->list);
pnv_ioda_free_pe(slave);
}
}
/*
* The PE for root bus can be removed because of hotplug in EEH
* recovery for fenced PHB error . We need to mark the PE dead so
* that it can be populated again in PCI hot add path . The PE
* shouldn ' t be destroyed as it ' s the global reserved resource .
*/
if (phb->ioda.root_pe_idx == pe->pe_number)
return ;
pnv_ioda_free_pe(pe);
}
static void pnv_pci_release_device(struct pci_dev *pdev)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(pdev->bus);
struct pci_dn *pdn = pci_get_pdn(pdev);
struct pnv_ioda_pe *pe;
/* The VF PE state is torn down when sriov_disable() is called */
if (pdev->is_virtfn)
return ;
if (!pdn || pdn->pe_number == IODA_INVALID_PE)
return ;
#ifdef CONFIG_PCI_IOV
/*
* FIXME : Try move this to sriov_disable ( ) . It ' s here since we allocate
* the iov state at probe time since we need to fiddle with the IOV
* resources .
*/
if (pdev->is_physfn)
kfree(pdev->dev.archdata.iov_data);
#endif
/*
* PCI hotplug can happen as part of EEH error recovery . The @ pdn
* isn ' t removed and added afterwards in this scenario . We should
* set the PE number in @ pdn to an invalid one . Otherwise , the PE ' s
* device count is decreased on removing devices while failing to
* be increased on adding devices . It leads to unbalanced PE ' s device
* count and eventually make normal PCI hotplug path broken .
*/
pe = &phb->ioda.pe_array[pdn->pe_number];
pdn->pe_number = IODA_INVALID_PE;
WARN_ON(--pe->device_count < 0 );
if (pe->device_count == 0 )
pnv_ioda_release_pe(pe);
}
static void pnv_pci_ioda_shutdown(struct pci_controller *hose)
{
struct pnv_phb *phb = hose->private_data;
opal_pci_reset(phb->opal_id, OPAL_RESET_PCI_IODA_TABLE,
OPAL_ASSERT_RESET);
}
static void pnv_pci_ioda_dma_bus_setup(struct pci_bus *bus)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(bus);
struct pnv_ioda_pe *pe;
list_for_each_entry(pe, &phb->ioda.pe_list, list) {
if (!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)))
continue ;
if (!pe->pbus)
continue ;
if (bus->number == ((pe->rid >> 8 ) & 0 xFF)) {
pe->pbus = bus;
break ;
}
}
}
#ifdef CONFIG_IOMMU_API
static struct iommu_group *pnv_pci_device_group(struct pci_controller *hose,
struct pci_dev *pdev)
{
struct pnv_phb *phb = hose->private_data;
struct pnv_ioda_pe *pe;
if (WARN_ON(!phb))
return ERR_PTR(-ENODEV);
pe = pnv_pci_bdfn_to_pe(phb, pci_dev_id(pdev));
if (!pe)
return ERR_PTR(-ENODEV);
if (!pe->table_group.group)
return ERR_PTR(-ENODEV);
return iommu_group_ref_get(pe->table_group.group);
}
#endif
static const struct pci_controller_ops pnv_pci_ioda_controller_ops = {
.dma_dev_setup = pnv_pci_ioda_dma_dev_setup,
.dma_bus_setup = pnv_pci_ioda_dma_bus_setup,
.iommu_bypass_supported = pnv_pci_ioda_iommu_bypass_supported,
.enable_device_hook = pnv_pci_enable_device_hook,
.release_device = pnv_pci_release_device,
.window_alignment = pnv_pci_window_alignment,
.setup_bridge = pnv_pci_fixup_bridge_resources,
.reset_secondary_bus = pnv_pci_reset_secondary_bus,
.shutdown = pnv_pci_ioda_shutdown,
#ifdef CONFIG_IOMMU_API
.device_group = pnv_pci_device_group,
#endif
};
static const struct pci_controller_ops pnv_npu_ocapi_ioda_controller_ops = {
.enable_device_hook = pnv_ocapi_enable_device_hook,
.release_device = pnv_pci_release_device,
.window_alignment = pnv_pci_window_alignment,
.reset_secondary_bus = pnv_pci_reset_secondary_bus,
.shutdown = pnv_pci_ioda_shutdown,
};
static void __init pnv_pci_init_ioda_phb(struct device_node *np,
u64 hub_id, int ioda_type)
{
struct pci_controller *hose;
struct pnv_phb *phb;
unsigned long size, m64map_off, m32map_off, pemap_off;
struct pnv_ioda_pe *root_pe;
struct resource r;
const __be64 *prop64;
const __be32 *prop32;
int len;
unsigned int segno;
u64 phb_id;
void *aux;
long rc;
if (!of_device_is_available(np))
return ;
pr_info("Initializing %s PHB (%pOF)\n" , pnv_phb_names[ioda_type], np);
prop64 = of_get_property(np, "ibm,opal-phbid" , NULL);
if (!prop64) {
pr_err(" Missing \" ibm,opal-phbid\" property !\n" );
return ;
}
phb_id = be64_to_cpup(prop64);
pr_debug(" PHB-ID : 0x%016llx\n" , phb_id);
phb = kzalloc(sizeof (*phb), GFP_KERNEL);
if (!phb)
panic("%s: Failed to allocate %zu bytes\n" , __func__,
sizeof (*phb));
/* Allocate PCI controller */
phb->hose = hose = pcibios_alloc_controller(np);
if (!phb->hose) {
pr_err(" Can't allocate PCI controller for %pOF\n" ,
np);
memblock_free(phb, sizeof (struct pnv_phb));
return ;
}
spin_lock_init(&phb->lock);
prop32 = of_get_property(np, "bus-range" , &len);
if (prop32 && len == 8 ) {
hose->first_busno = be32_to_cpu(prop32[0 ]);
hose->last_busno = be32_to_cpu(prop32[1 ]);
} else {
pr_warn(" Broken <bus-range> on %pOF\n" , np);
hose->first_busno = 0 ;
hose->last_busno = 0 xff;
}
hose->private_data = phb;
phb->hub_id = hub_id;
phb->opal_id = phb_id;
phb->type = ioda_type;
mutex_init(&phb->ioda.pe_alloc_mutex);
/* Detect specific models for error handling */
if (of_device_is_compatible(np, "ibm,p7ioc-pciex" ))
phb->model = PNV_PHB_MODEL_P7IOC;
else if (of_device_is_compatible(np, "ibm,power8-pciex" ))
phb->model = PNV_PHB_MODEL_PHB3;
else
phb->model = PNV_PHB_MODEL_UNKNOWN;
/* Initialize diagnostic data buffer */
prop32 = of_get_property(np, "ibm,phb-diag-data-size" , NULL);
if (prop32)
phb->diag_data_size = be32_to_cpup(prop32);
else
phb->diag_data_size = PNV_PCI_DIAG_BUF_SIZE;
phb->diag_data = kzalloc(phb->diag_data_size, GFP_KERNEL);
if (!phb->diag_data)
panic("%s: Failed to allocate %u bytes\n" , __func__,
phb->diag_data_size);
/* Parse 32-bit and IO ranges (if any) */
pci_process_bridge_OF_ranges(hose, np, !hose->global_number);
/* Get registers */
if (!of_address_to_resource(np, 0 , &r)) {
phb->regs_phys = r.start;
phb->regs = ioremap(r.start, resource_size(&r));
if (phb->regs == NULL)
pr_err(" Failed to map registers !\n" );
}
/* Initialize more IODA stuff */
phb->ioda.total_pe_num = 1 ;
prop32 = of_get_property(np, "ibm,opal-num-pes" , NULL);
if (prop32)
phb->ioda.total_pe_num = be32_to_cpup(prop32);
prop32 = of_get_property(np, "ibm,opal-reserved-pe" , NULL);
if (prop32)
phb->ioda.reserved_pe_idx = be32_to_cpup(prop32);
/* Invalidate RID to PE# mapping */
for (segno = 0 ; segno < ARRAY_SIZE(phb->ioda.pe_rmap); segno++)
phb->ioda.pe_rmap[segno] = IODA_INVALID_PE;
/* Parse 64-bit MMIO range */
pnv_ioda_parse_m64_window(phb);
phb->ioda.m32_size = resource_size(&hose->mem_resources[0 ]);
/* FW Has already off top 64k of M32 space (MSI space) */
phb->ioda.m32_size += 0 x10000;
phb->ioda.m32_segsize = phb->ioda.m32_size / phb->ioda.total_pe_num;
phb->ioda.m32_pci_base = hose->mem_resources[0 ].start - hose->mem_offset[0 ];
phb->ioda.io_size = hose->pci_io_size;
phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe_num;
phb->ioda.io_pci_base = 0 ; /* XXX calculate this ? */
/* Allocate aux data & arrays. We don't have IO ports on PHB3 */
size = ALIGN(max_t(unsigned , phb->ioda.total_pe_num, 8 ) / 8 ,
sizeof (unsigned long ));
m64map_off = size;
size += phb->ioda.total_pe_num * sizeof (phb->ioda.m64_segmap[0 ]);
m32map_off = size;
size += phb->ioda.total_pe_num * sizeof (phb->ioda.m32_segmap[0 ]);
pemap_off = size;
size += phb->ioda.total_pe_num * sizeof (struct pnv_ioda_pe);
aux = kzalloc(size, GFP_KERNEL);
if (!aux)
panic("%s: Failed to allocate %lu bytes\n" , __func__, size);
phb->ioda.pe_alloc = aux;
phb->ioda.m64_segmap = aux + m64map_off;
phb->ioda.m32_segmap = aux + m32map_off;
for (segno = 0 ; segno < phb->ioda.total_pe_num; segno++) {
phb->ioda.m64_segmap[segno] = IODA_INVALID_PE;
phb->ioda.m32_segmap[segno] = IODA_INVALID_PE;
}
phb->ioda.pe_array = aux + pemap_off;
/*
* Choose PE number for root bus , which shouldn ' t have
* M64 resources consumed by its child devices . To pick
* the PE number adjacent to the reserved one if possible .
*/
pnv_ioda_reserve_pe(phb, phb->ioda.reserved_pe_idx);
if (phb->ioda.reserved_pe_idx == 0 ) {
phb->ioda.root_pe_idx = 1 ;
pnv_ioda_reserve_pe(phb, phb->ioda.root_pe_idx);
} else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1 )) {
phb->ioda.root_pe_idx = phb->ioda.reserved_pe_idx - 1 ;
pnv_ioda_reserve_pe(phb, phb->ioda.root_pe_idx);
} else {
/* otherwise just allocate one */
root_pe = pnv_ioda_alloc_pe(phb, 1 );
phb->ioda.root_pe_idx = root_pe->pe_number;
}
INIT_LIST_HEAD(&phb->ioda.pe_list);
mutex_init(&phb->ioda.pe_list_mutex);
#if 0 /* We should really do that ... */
rc = opal_pci_set_phb_mem_window(opal->phb_id,
window_type,
window_num,
starting_real_address,
starting_pci_address,
segment_size);
#endif
pr_info(" %03d (%03d) PE's M32: 0x%x [segment=0x%x]\n" ,
phb->ioda.total_pe_num, phb->ioda.reserved_pe_idx,
phb->ioda.m32_size, phb->ioda.m32_segsize);
if (phb->ioda.m64_size)
pr_info(" M64: 0x%lx [segment=0x%lx]\n" ,
phb->ioda.m64_size, phb->ioda.m64_segsize);
if (phb->ioda.io_size)
pr_info(" IO: 0x%x [segment=0x%x]\n" ,
phb->ioda.io_size, phb->ioda.io_segsize);
phb->hose->ops = &pnv_pci_ops;
phb->get_pe_state = pnv_ioda_get_pe_state;
phb->freeze_pe = pnv_ioda_freeze_pe;
phb->unfreeze_pe = pnv_ioda_unfreeze_pe;
/* Setup MSI support */
pnv_pci_init_ioda_msis(phb);
/*
* We pass the PCI probe flag PCI_REASSIGN_ALL_RSRC here
* to let the PCI core do resource assignment . It ' s supposed
* that the PCI core will do correct I / O and MMIO alignment
* for the P2P bridge bars so that each PCI bus ( excluding
* the child P2P bridges ) can form individual PE .
*/
ppc_md.pcibios_fixup = pnv_pci_ioda_fixup;
switch (phb->type) {
case PNV_PHB_NPU_OCAPI:
hose->controller_ops = pnv_npu_ocapi_ioda_controller_ops;
break ;
default :
hose->controller_ops = pnv_pci_ioda_controller_ops;
}
ppc_md.pcibios_default_alignment = pnv_pci_default_alignment;
#ifdef CONFIG_PCI_IOV
ppc_md.pcibios_fixup_sriov = pnv_pci_ioda_fixup_iov;
ppc_md.pcibios_iov_resource_alignment = pnv_pci_iov_resource_alignment;
ppc_md.pcibios_sriov_enable = pnv_pcibios_sriov_enable;
ppc_md.pcibios_sriov_disable = pnv_pcibios_sriov_disable;
#endif
pci_add_flags(PCI_REASSIGN_ALL_RSRC);
/* Reset IODA tables to a clean state */
rc = opal_pci_reset(phb_id, OPAL_RESET_PCI_IODA_TABLE, OPAL_ASSERT_RESET);
if (rc)
pr_warn(" OPAL Error %ld performing IODA table reset !\n" , rc);
/*
* If we ' re running in kdump kernel , the previous kernel never
* shutdown PCI devices correctly . We already got IODA table
* cleaned out . So we have to issue PHB reset to stop all PCI
* transactions from previous kernel . The ppc_pci_reset_phbs
* kernel parameter will force this reset too . Additionally ,
* if the IODA reset above failed then use a bigger hammer .
* This can happen if we get a PHB fatal error in very early
* boot .
*/
if (is_kdump_kernel() || pci_reset_phbs || rc) {
pr_info(" Issue PHB reset ...\n" );
pnv_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL);
pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE);
}
/* Remove M64 resource if we can't configure it successfully */
if (!phb->init_m64 || phb->init_m64(phb))
hose->mem_resources[1 ].flags = 0 ;
/* create pci_dn's for DT nodes under this PHB */
pci_devs_phb_init_dynamic(hose);
}
void __init pnv_pci_init_ioda2_phb(struct device_node *np)
{
pnv_pci_init_ioda_phb(np, 0 , PNV_PHB_IODA2);
}
void __init pnv_pci_init_npu2_opencapi_phb(struct device_node *np)
{
pnv_pci_init_ioda_phb(np, 0 , PNV_PHB_NPU_OCAPI);
}
static void pnv_npu2_opencapi_cfg_size_fixup(struct pci_dev *dev)
{
struct pnv_phb *phb = pci_bus_to_pnvhb(dev->bus);
if (!machine_is(powernv))
return ;
if (phb->type == PNV_PHB_NPU_OCAPI)
dev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
}
DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pnv_npu2_opencapi_cfg_size_fixup);
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