Commit 1635317f authored by Paul Mackerras's avatar Paul Mackerras
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[PATCH] Separate pci bits out of struct device_node



This patch pulls the PCI-related junk out of struct device_node and
puts it in a separate structure, struct pci_dn.  The device_node now
just has a void * pointer in it, which points to a struct pci_dn for
nodes that represent PCI devices.  It could potentially be used in
future for device-specific data for other sorts of devices, such as
virtual I/O devices.
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent b28d2582
......@@ -254,6 +254,7 @@ pci_addr_cache_insert(struct pci_dev *dev, unsigned long alo,
static void __pci_addr_cache_insert_device(struct pci_dev *dev)
{
struct device_node *dn;
struct pci_dn *pdn;
int i;
int inserted = 0;
......@@ -265,8 +266,9 @@ static void __pci_addr_cache_insert_device(struct pci_dev *dev)
}
/* Skip any devices for which EEH is not enabled. */
if (!(dn->eeh_mode & EEH_MODE_SUPPORTED) ||
dn->eeh_mode & EEH_MODE_NOCHECK) {
pdn = dn->data;
if (!(pdn->eeh_mode & EEH_MODE_SUPPORTED) ||
pdn->eeh_mode & EEH_MODE_NOCHECK) {
#ifdef DEBUG
printk(KERN_INFO "PCI: skip building address cache for=%s\n",
pci_name(dev));
......@@ -415,6 +417,7 @@ int eeh_unregister_notifier(struct notifier_block *nb)
static int read_slot_reset_state(struct device_node *dn, int rets[])
{
int token, outputs;
struct pci_dn *pdn = dn->data;
if (ibm_read_slot_reset_state2 != RTAS_UNKNOWN_SERVICE) {
token = ibm_read_slot_reset_state2;
......@@ -424,8 +427,8 @@ static int read_slot_reset_state(struct device_node *dn, int rets[])
outputs = 3;
}
return rtas_call(token, 3, outputs, rets, dn->eeh_config_addr,
BUID_HI(dn->phb->buid), BUID_LO(dn->phb->buid));
return rtas_call(token, 3, outputs, rets, pdn->eeh_config_addr,
BUID_HI(pdn->phb->buid), BUID_LO(pdn->phb->buid));
}
/**
......@@ -534,6 +537,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
unsigned long flags;
int rc, reset_state;
struct eeh_event *event;
struct pci_dn *pdn;
__get_cpu_var(total_mmio_ffs)++;
......@@ -542,14 +546,15 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
if (!dn)
return 0;
pdn = dn->data;
/* Access to IO BARs might get this far and still not want checking. */
if (!(dn->eeh_mode & EEH_MODE_SUPPORTED) ||
dn->eeh_mode & EEH_MODE_NOCHECK) {
if (!pdn->eeh_capable || !(pdn->eeh_mode & EEH_MODE_SUPPORTED) ||
pdn->eeh_mode & EEH_MODE_NOCHECK) {
return 0;
}
if (!dn->eeh_config_addr) {
if (!pdn->eeh_config_addr) {
return 0;
}
......@@ -557,7 +562,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
* If we already have a pending isolation event for this
* slot, we know it's bad already, we don't need to check...
*/
if (dn->eeh_mode & EEH_MODE_ISOLATED) {
if (pdn->eeh_mode & EEH_MODE_ISOLATED) {
atomic_inc(&eeh_fail_count);
if (atomic_read(&eeh_fail_count) >= EEH_MAX_FAILS) {
/* re-read the slot reset state */
......@@ -582,7 +587,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
}
/* prevent repeated reports of this failure */
dn->eeh_mode |= EEH_MODE_ISOLATED;
pdn->eeh_mode |= EEH_MODE_ISOLATED;
reset_state = rets[0];
......@@ -590,9 +595,9 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
memset(slot_errbuf, 0, eeh_error_buf_size);
rc = rtas_call(ibm_slot_error_detail,
8, 1, NULL, dn->eeh_config_addr,
BUID_HI(dn->phb->buid),
BUID_LO(dn->phb->buid), NULL, 0,
8, 1, NULL, pdn->eeh_config_addr,
BUID_HI(pdn->phb->buid),
BUID_LO(pdn->phb->buid), NULL, 0,
virt_to_phys(slot_errbuf),
eeh_error_buf_size,
1 /* Temporary Error */);
......@@ -679,8 +684,9 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
u32 *device_id = (u32 *)get_property(dn, "device-id", NULL);
u32 *regs;
int enable;
struct pci_dn *pdn = dn->data;
dn->eeh_mode = 0;
pdn->eeh_mode = 0;
if (status && strcmp(status, "ok") != 0)
return NULL; /* ignore devices with bad status */
......@@ -691,7 +697,7 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
/* There is nothing to check on PCI to ISA bridges */
if (dn->type && !strcmp(dn->type, "isa")) {
dn->eeh_mode |= EEH_MODE_NOCHECK;
pdn->eeh_mode |= EEH_MODE_NOCHECK;
return NULL;
}
......@@ -708,7 +714,7 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
enable = 0;
if (!enable)
dn->eeh_mode |= EEH_MODE_NOCHECK;
pdn->eeh_mode |= EEH_MODE_NOCHECK;
/* Ok... see if this device supports EEH. Some do, some don't,
* and the only way to find out is to check each and every one. */
......@@ -721,8 +727,8 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
EEH_ENABLE);
if (ret == 0) {
eeh_subsystem_enabled = 1;
dn->eeh_mode |= EEH_MODE_SUPPORTED;
dn->eeh_config_addr = regs[0];
pdn->eeh_mode |= EEH_MODE_SUPPORTED;
pdn->eeh_config_addr = regs[0];
#ifdef DEBUG
printk(KERN_DEBUG "EEH: %s: eeh enabled\n", dn->full_name);
#endif
......@@ -730,10 +736,11 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
/* This device doesn't support EEH, but it may have an
* EEH parent, in which case we mark it as supported. */
if (dn->parent && (dn->parent->eeh_mode & EEH_MODE_SUPPORTED)) {
if (dn->parent && dn->parent->data
&& (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) {
/* Parent supports EEH. */
dn->eeh_mode |= EEH_MODE_SUPPORTED;
dn->eeh_config_addr = dn->parent->eeh_config_addr;
pdn->eeh_mode |= EEH_MODE_SUPPORTED;
pdn->eeh_config_addr = PCI_DN(dn->parent)->eeh_config_addr;
return NULL;
}
}
......@@ -790,11 +797,13 @@ void __init eeh_init(void)
for (phb = of_find_node_by_name(NULL, "pci"); phb;
phb = of_find_node_by_name(phb, "pci")) {
unsigned long buid;
struct pci_dn *pci;
buid = get_phb_buid(phb);
if (buid == 0)
if (buid == 0 || phb->data == NULL)
continue;
pci = phb->data;
info.buid_lo = BUID_LO(buid);
info.buid_hi = BUID_HI(buid);
traverse_pci_devices(phb, early_enable_eeh, &info);
......@@ -823,9 +832,9 @@ void eeh_add_device_early(struct device_node *dn)
struct pci_controller *phb;
struct eeh_early_enable_info info;
if (!dn)
if (!dn || !dn->data)
return;
phb = dn->phb;
phb = PCI_DN(dn)->phb;
if (NULL == phb || 0 == phb->buid) {
printk(KERN_WARNING "EEH: Expected buid but found none\n");
return;
......
......@@ -438,7 +438,8 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl)
void iommu_free_table(struct device_node *dn)
{
struct iommu_table *tbl = dn->iommu_table;
struct pci_dn *pdn = dn->data;
struct iommu_table *tbl = pdn->iommu_table;
unsigned long bitmap_sz, i;
unsigned int order;
......
......@@ -447,9 +447,9 @@ void __init maple_pci_init(void)
*/
if (u3_agp) {
struct device_node *np = u3_agp->arch_data;
np->busno = 0xf0;
PCI_DN(np)->busno = 0xf0;
for (np = np->child; np; np = np->sibling)
np->busno = 0xf0;
PCI_DN(np)->busno = 0xf0;
}
/* Tell pci.c to use the common resource allocation mecanism */
......
......@@ -295,7 +295,7 @@ static void iommu_table_setparms_lpar(struct pci_controller *phb,
struct iommu_table *tbl,
unsigned int *dma_window)
{
tbl->it_busno = dn->bussubno;
tbl->it_busno = PCI_DN(dn)->bussubno;
/* TODO: Parse field size properties properly. */
tbl->it_size = (((unsigned long)dma_window[4] << 32) |
......@@ -311,6 +311,7 @@ static void iommu_table_setparms_lpar(struct pci_controller *phb,
static void iommu_bus_setup_pSeries(struct pci_bus *bus)
{
struct device_node *dn, *pdn;
struct pci_dn *pci;
struct iommu_table *tbl;
DBG("iommu_bus_setup_pSeries, bus %p, bus->self %p\n", bus, bus->self);
......@@ -325,6 +326,7 @@ static void iommu_bus_setup_pSeries(struct pci_bus *bus)
*/
dn = pci_bus_to_OF_node(bus);
pci = dn->data;
if (!bus->self) {
/* Root bus */
......@@ -341,18 +343,18 @@ static void iommu_bus_setup_pSeries(struct pci_bus *bus)
* alltogether. This leaves 768MB for the window.
*/
DBG("PHB has io-hole, reserving 256MB\n");
dn->phb->dma_window_size = 3 << 28;
dn->phb->dma_window_base_cur = 1 << 28;
pci->phb->dma_window_size = 3 << 28;
pci->phb->dma_window_base_cur = 1 << 28;
} else {
/* 1GB window by default */
dn->phb->dma_window_size = 1 << 30;
dn->phb->dma_window_base_cur = 0;
pci->phb->dma_window_size = 1 << 30;
pci->phb->dma_window_base_cur = 0;
}
tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
iommu_table_setparms(dn->phb, dn, tbl);
dn->iommu_table = iommu_init_table(tbl);
iommu_table_setparms(pci->phb, dn, tbl);
pci->iommu_table = iommu_init_table(tbl);
} else {
/* Do a 128MB table at root. This is used for the IDE
* controller on some SMP-mode POWER4 machines. It
......@@ -363,16 +365,16 @@ static void iommu_bus_setup_pSeries(struct pci_bus *bus)
* Allocate at offset 128MB to avoid having to deal
* with ISA holes; 128MB table for IDE is plenty.
*/
dn->phb->dma_window_size = 1 << 27;
dn->phb->dma_window_base_cur = 1 << 27;
pci->phb->dma_window_size = 1 << 27;
pci->phb->dma_window_base_cur = 1 << 27;
tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
iommu_table_setparms(dn->phb, dn, tbl);
dn->iommu_table = iommu_init_table(tbl);
iommu_table_setparms(pci->phb, dn, tbl);
pci->iommu_table = iommu_init_table(tbl);
/* All child buses have 256MB tables */
dn->phb->dma_window_size = 1 << 28;
pci->phb->dma_window_size = 1 << 28;
}
} else {
pdn = pci_bus_to_OF_node(bus->parent);
......@@ -386,12 +388,12 @@ static void iommu_bus_setup_pSeries(struct pci_bus *bus)
tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
iommu_table_setparms(dn->phb, dn, tbl);
iommu_table_setparms(pci->phb, dn, tbl);
dn->iommu_table = iommu_init_table(tbl);
pci->iommu_table = iommu_init_table(tbl);
} else {
/* Lower than first child or under python, use parent table */
dn->iommu_table = pdn->iommu_table;
pci->iommu_table = PCI_DN(pdn)->iommu_table;
}
}
}
......@@ -401,6 +403,7 @@ static void iommu_bus_setup_pSeriesLP(struct pci_bus *bus)
{
struct iommu_table *tbl;
struct device_node *dn, *pdn;
struct pci_dn *ppci;
unsigned int *dma_window = NULL;
DBG("iommu_bus_setup_pSeriesLP, bus %p, bus->self %p\n", bus, bus->self);
......@@ -419,22 +422,24 @@ static void iommu_bus_setup_pSeriesLP(struct pci_bus *bus)
return;
}
if (!pdn->iommu_table) {
ppci = pdn->data;
if (!ppci->iommu_table) {
/* Bussubno hasn't been copied yet.
* Do it now because iommu_table_setparms_lpar needs it.
*/
pdn->bussubno = bus->number;
ppci->bussubno = bus->number;
tbl = (struct iommu_table *)kmalloc(sizeof(struct iommu_table),
GFP_KERNEL);
iommu_table_setparms_lpar(pdn->phb, pdn, tbl, dma_window);
iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window);
pdn->iommu_table = iommu_init_table(tbl);
ppci->iommu_table = iommu_init_table(tbl);
}
if (pdn != dn)
dn->iommu_table = pdn->iommu_table;
PCI_DN(dn)->iommu_table = ppci->iommu_table;
}
......@@ -449,11 +454,11 @@ static void iommu_dev_setup_pSeries(struct pci_dev *dev)
*/
mydn = dn = pci_device_to_OF_node(dev);
while (dn && dn->iommu_table == NULL)
while (dn && dn->data && PCI_DN(dn)->iommu_table == NULL)
dn = dn->parent;
if (dn) {
mydn->iommu_table = dn->iommu_table;
if (dn && dn->data) {
PCI_DN(mydn)->iommu_table = PCI_DN(dn)->iommu_table;
} else {
DBG("iommu_dev_setup_pSeries, dev %p (%s) has no iommu table\n", dev, dev->pretty_name);
}
......@@ -463,10 +468,11 @@ static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long acti
{
int err = NOTIFY_OK;
struct device_node *np = node;
struct pci_dn *pci = np->data;
switch (action) {
case PSERIES_RECONFIG_REMOVE:
if (np->iommu_table &&
if (pci->iommu_table &&
get_property(np, "ibm,dma-window", NULL))
iommu_free_table(np);
break;
......@@ -486,6 +492,7 @@ static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
struct device_node *pdn, *dn;
struct iommu_table *tbl;
int *dma_window = NULL;
struct pci_dn *pci;
DBG("iommu_dev_setup_pSeriesLP, dev %p (%s)\n", dev, dev->pretty_name);
......@@ -497,8 +504,10 @@ static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
*/
dn = pci_device_to_OF_node(dev);
for (pdn = dn; pdn && !pdn->iommu_table; pdn = pdn->parent) {
dma_window = (unsigned int *)get_property(pdn, "ibm,dma-window", NULL);
for (pdn = dn; pdn && pdn->data && !PCI_DN(pdn)->iommu_table;
pdn = pdn->parent) {
dma_window = (unsigned int *)
get_property(pdn, "ibm,dma-window", NULL);
if (dma_window)
break;
}
......@@ -515,20 +524,21 @@ static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
DBG("Found DMA window, allocating table\n");
}
if (!pdn->iommu_table) {
pci = pdn->data;
if (!pci->iommu_table) {
/* iommu_table_setparms_lpar needs bussubno. */
pdn->bussubno = pdn->phb->bus->number;
pci->bussubno = pci->phb->bus->number;
tbl = (struct iommu_table *)kmalloc(sizeof(struct iommu_table),
GFP_KERNEL);
iommu_table_setparms_lpar(pdn->phb, pdn, tbl, dma_window);
iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window);
pdn->iommu_table = iommu_init_table(tbl);
pci->iommu_table = iommu_init_table(tbl);
}
if (pdn != dn)
dn->iommu_table = pdn->iommu_table;
PCI_DN(dn)->iommu_table = pci->iommu_table;
}
static void iommu_bus_setup_null(struct pci_bus *b) { }
......
......@@ -837,9 +837,11 @@ int pcibios_scan_all_fns(struct pci_bus *bus, int devfn)
* device tree. If they are then we need to scan all the
* functions of this slot.
*/
for (dn = busdn->child; dn; dn = dn->sibling)
if ((dn->devfn >> 3) == (devfn >> 3))
for (dn = busdn->child; dn; dn = dn->sibling) {
struct pci_dn *pdn = dn->data;
if (pdn && (pdn->devfn >> 3) == (devfn >> 3))
return 1;
}
return 0;
}
......
......@@ -34,7 +34,6 @@ void *traverse_pci_devices(struct device_node *start, traverse_func pre,
void pci_devs_phb_init(void);
void pci_devs_phb_init_dynamic(struct pci_controller *phb);
struct device_node *fetch_dev_dn(struct pci_dev *dev);
/* PCI address cache management routines */
void pci_addr_cache_insert_device(struct pci_dev *dev);
......
......@@ -23,6 +23,8 @@
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <asm/io.h>
#include <asm/prom.h>
......@@ -40,16 +42,26 @@ static void * __devinit update_dn_pci_info(struct device_node *dn, void *data)
struct pci_controller *phb = data;
int *type = (int *)get_property(dn, "ibm,pci-config-space-type", NULL);
u32 *regs;
dn->phb = phb;
struct pci_dn *pdn;
if (phb->is_dynamic)
pdn = kmalloc(sizeof(*pdn), GFP_KERNEL);
else
pdn = alloc_bootmem(sizeof(*pdn));
if (pdn == NULL)
return NULL;
memset(pdn, 0, sizeof(*pdn));
dn->data = pdn;
pdn->node = dn;
pdn->phb = phb;
regs = (u32 *)get_property(dn, "reg", NULL);
if (regs) {
/* First register entry is addr (00BBSS00) */
dn->busno = (regs[0] >> 16) & 0xff;
dn->devfn = (regs[0] >> 8) & 0xff;
pdn->busno = (regs[0] >> 16) & 0xff;
pdn->devfn = (regs[0] >> 8) & 0xff;
}
dn->pci_ext_config_space = (type && *type == 1);
pdn->pci_ext_config_space = (type && *type == 1);
return NULL;
}
......@@ -112,10 +124,15 @@ void *traverse_pci_devices(struct device_node *start, traverse_func pre,
void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb)
{
struct device_node * dn = (struct device_node *) phb->arch_data;
struct pci_dn *pdn;
/* PHB nodes themselves must not match */
dn->devfn = dn->busno = -1;
dn->phb = phb;
update_dn_pci_info(dn, phb);
pdn = dn->data;
if (pdn) {
pdn->devfn = pdn->busno = -1;
pdn->phb = phb;
}
/* Update dn->phb ptrs for new phb and children devices */
traverse_pci_devices(dn, update_dn_pci_info, phb);
......@@ -123,14 +140,17 @@ void __devinit pci_devs_phb_init_dynamic(struct pci_controller *phb)
/*
* Traversal func that looks for a <busno,devfcn> value.
* If found, the device_node is returned (thus terminating the traversal).
* If found, the pci_dn is returned (thus terminating the traversal).
*/
static void *is_devfn_node(struct device_node *dn, void *data)
{
int busno = ((unsigned long)data >> 8) & 0xff;
int devfn = ((unsigned long)data) & 0xff;
struct pci_dn *pci = dn->data;
return ((devfn == dn->devfn) && (busno == dn->busno)) ? dn : NULL;
if (pci && (devfn == pci->devfn) && (busno == pci->busno))
return dn;
return NULL;
}
/*
......@@ -149,13 +169,10 @@ static void *is_devfn_node(struct device_node *dn, void *data)
struct device_node *fetch_dev_dn(struct pci_dev *dev)
{
struct device_node *orig_dn = dev->sysdata;
struct pci_controller *phb = orig_dn->phb; /* assume same phb as orig_dn */
struct device_node *phb_dn;
struct device_node *dn;
unsigned long searchval = (dev->bus->number << 8) | dev->devfn;
phb_dn = phb->arch_data;
dn = traverse_pci_devices(phb_dn, is_devfn_node, (void *)searchval);
dn = traverse_pci_devices(orig_dn, is_devfn_node, (void *)searchval);
if (dn)
dev->sysdata = dn;
return dn;
......@@ -165,11 +182,13 @@ EXPORT_SYMBOL(fetch_dev_dn);
static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
{
struct device_node *np = node;
struct pci_dn *pci;
int err = NOTIFY_OK;
switch (action) {
case PSERIES_RECONFIG_ADD:
update_dn_pci_info(np, np->parent->phb);
pci = np->parent->data;
update_dn_pci_info(np, pci->phb);
break;
default:
err = NOTIFY_DONE;
......
......@@ -66,7 +66,7 @@ static inline struct iommu_table *devnode_table(struct device *dev)
#endif /* CONFIG_PPC_ISERIES */
#ifdef CONFIG_PPC_MULTIPLATFORM
return PCI_GET_DN(pdev)->iommu_table;
return PCI_DN(PCI_GET_DN(pdev))->iommu_table;
#endif /* CONFIG_PPC_MULTIPLATFORM */
}
......
......@@ -674,6 +674,7 @@ void __init pmac_check_ht_link(void)
#if 0 /* Disabled for now */
u32 ufreq, freq, ucfg, cfg;
struct device_node *pcix_node;
struct pci_dn *pdn;
u8 px_bus, px_devfn;
struct pci_controller *px_hose;
......@@ -687,9 +688,10 @@ void __init pmac_check_ht_link(void)
printk("No PCI-X bridge found\n");
return;
}
px_hose = pcix_node->phb;
px_bus = pcix_node->busno;
px_devfn = pcix_node->devfn;
pdn = pcix_node->data;
px_hose = pdn->phb;
px_bus = pdn->busno;
px_devfn = pdn->devfn;
early_read_config_dword(px_hose, px_bus, px_devfn, 0xc4, &cfg);
early_read_config_dword(px_hose, px_bus, px_devfn, 0xcc, &freq);
......
......@@ -242,7 +242,7 @@ static int u3_ht_skip_device(struct pci_controller *hose,
else
busdn = hose->arch_data;
for (dn = busdn->child; dn; dn = dn->sibling)
if (dn->devfn == devfn)
if (dn->data && PCI_DN(dn)->devfn == devfn)
break;
if (dn == NULL)
return -1;
......@@ -746,9 +746,9 @@ void __init pmac_pci_init(void)
*/
if (u3_agp) {
struct device_node *np = u3_agp->arch_data;
np->busno = 0xf0;
PCI_DN(np)->busno = 0xf0;
for (np = np->child; np; np = np->sibling)
np->busno = 0xf0;
PCI_DN(np)->busno = 0xf0;
}
pmac_check_ht_link();
......
......@@ -1733,6 +1733,7 @@ static void of_node_release(struct kref *kref)
kfree(node->intrs);
kfree(node->addrs);
kfree(node->full_name);
kfree(node->data);
kfree(node);
}
......
......@@ -48,7 +48,7 @@ static int write_pci_config;
static int ibm_read_pci_config;
static int ibm_write_pci_config;
static int config_access_valid(struct device_node *dn, int where)
static int config_access_valid(struct pci_dn *dn, int where)
{
if (where < 256)
return 1;
......@@ -78,15 +78,17 @@ static int rtas_read_config(struct device_node *dn, int where, int size, u32 *va
int returnval = -1;
unsigned long buid, addr;
int ret;
struct pci_dn *pdn;
if (!dn)
if (!dn || !dn->data)
return PCIBIOS_DEVICE_NOT_FOUND;
if (!config_access_valid(dn, where))
pdn = dn->data;
if (!config_access_valid(pdn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = ((where & 0xf00) << 20) | (dn->busno << 16) |
(dn->devfn << 8) | (where & 0xff);