13 files changed, 393 insertions, 80 deletions

diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 9f63ae0f404b..b7808a89d945 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -159,9 +159,15 @@ char *__acpi_map_table(unsigned long phys, unsigned long size)
 #endif
 
 #ifdef CONFIG_PCI_MMCONFIG
-static int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
+/* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
+struct acpi_table_mcfg_config *pci_mmcfg_config;
+int pci_mmcfg_config_num;
+
+int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
 {
         struct acpi_table_mcfg *mcfg;
+        unsigned long i;
+        int config_size;
 
         if (!phys_addr || !size)
                 return -EINVAL;
@@ -172,18 +178,38 @@ static int __init acpi_parse_mcfg(unsigned long phys_addr, unsigned long size)
                 return -ENODEV;
         }
 
-        if (mcfg->base_reserved) {
-                printk(KERN_ERR PREFIX "MMCONFIG not in low 4GB of memory\n");
+        /* how many config structures do we have */
+        pci_mmcfg_config_num = 0;
+        i = size - sizeof(struct acpi_table_mcfg);
+        while (i >= sizeof(struct acpi_table_mcfg_config)) {
+                ++pci_mmcfg_config_num;
+                i -= sizeof(struct acpi_table_mcfg_config);
+        };
+        if (pci_mmcfg_config_num == 0) {
+                printk(KERN_ERR PREFIX "MMCONFIG has no entries\n");
                 return -ENODEV;
         }
 
-        pci_mmcfg_base_addr = mcfg->base_address;
+        config_size = pci_mmcfg_config_num * sizeof(*pci_mmcfg_config);
+        pci_mmcfg_config = kmalloc(config_size, GFP_KERNEL);
+        if (!pci_mmcfg_config) {
+                printk(KERN_WARNING PREFIX
+                       "No memory for MCFG config tables\n");
+                return -ENOMEM;
+        }
+
+        memcpy(pci_mmcfg_config, &mcfg->config, config_size);
+        for (i = 0; i < pci_mmcfg_config_num; ++i) {
+                if (mcfg->config[i].base_reserved) {
+                        printk(KERN_ERR PREFIX
+                               "MMCONFIG not in low 4GB of memory\n");
+                        return -ENODEV;
+                }
+        }
 
         return 0;
 }
-#else
-#define acpi_parse_mcfg NULL
-#endif /* !CONFIG_PCI_MMCONFIG */
+#endif /* CONFIG_PCI_MMCONFIG */
 
 #ifdef CONFIG_X86_LOCAL_APIC
 static int __init
@@ -507,6 +533,22 @@ acpi_unmap_lsapic(int cpu)
 EXPORT_SYMBOL(acpi_unmap_lsapic);
 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
 
+int
+acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
+{
+        /* TBD */
+        return -EINVAL;
+}
+EXPORT_SYMBOL(acpi_register_ioapic);
+
+int
+acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
+{
+        /* TBD */
+        return -EINVAL;
+}
+EXPORT_SYMBOL(acpi_unregister_ioapic);
+
 static unsigned long __init
 acpi_scan_rsdp (
         unsigned long           start,
@@ -1123,7 +1165,6 @@ int __init acpi_boot_init(void)
         acpi_process_madt();
 
         acpi_table_parse(ACPI_HPET, acpi_parse_hpet);
-        acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
 
         return 0;
 }
diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index 720975e1af50..87325263cd4f 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -25,7 +25,8 @@ unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
 
 int pci_routeirq;
 int pcibios_last_bus = -1;
-struct pci_bus *pci_root_bus = NULL;
+unsigned long pirq_table_addr;
+struct pci_bus *pci_root_bus;
 struct pci_raw_ops *raw_pci_ops;
 
 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
@@ -133,7 +134,7 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
 
         printk("PCI: Probing PCI hardware (bus %02x)\n", busnum);
 
-        return pci_scan_bus(busnum, &pci_root_ops, NULL);
+        return pci_scan_bus_parented(NULL, busnum, &pci_root_ops, NULL);
 }
 
 extern u8 pci_cache_line_size;
@@ -188,6 +189,9 @@ char * __devinit  pcibios_setup(char *str)
         } else if (!strcmp(str, "biosirq")) {
                 pci_probe |= PCI_BIOS_IRQ_SCAN;
                 return NULL;
+        } else if (!strncmp(str, "pirqaddr=", 9)) {
+                pirq_table_addr = simple_strtoul(str+9, NULL, 0);
+                return NULL;
         }
 #endif
 #ifdef CONFIG_PCI_DIRECT
diff --git a/arch/i386/pci/irq.c b/arch/i386/pci/irq.c
index 83458f81e661..78ca1ecbb907 100644
--- a/arch/i386/pci/irq.c
+++ b/arch/i386/pci/irq.c
@@ -58,6 +58,35 @@ struct irq_router_handler {
 int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
 
 /*
+ *  Check passed address for the PCI IRQ Routing Table signature
+ *  and perform checksum verification.
+ */
+
+static inline struct irq_routing_table * pirq_check_routing_table(u8 *addr)
+{
+        struct irq_routing_table *rt;
+        int i;
+        u8 sum;
+
+        rt = (struct irq_routing_table *) addr;
+        if (rt->signature != PIRQ_SIGNATURE ||
+            rt->version != PIRQ_VERSION ||
+            rt->size % 16 ||
+            rt->size < sizeof(struct irq_routing_table))
+                return NULL;
+        sum = 0;
+        for (i=0; i < rt->size; i++)
+                sum += addr[i];
+        if (!sum) {
+                DBG("PCI: Interrupt Routing Table found at 0x%p\n", rt);
+                return rt;
+        }
+        return NULL;
+}
+
+
+
+/*
  *  Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
  */
 
@@ -65,23 +94,17 @@ static struct irq_routing_table * __init pirq_find_routing_table(void)
 {
         u8 *addr;
         struct irq_routing_table *rt;
-        int i;
-        u8 sum;
 
+        if (pirq_table_addr) {
+                rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
+                if (rt)
+                        return rt;
+                printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
+        }
         for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
-                rt = (struct irq_routing_table *) addr;
-                if (rt->signature != PIRQ_SIGNATURE ||
-                    rt->version != PIRQ_VERSION ||
-                    rt->size % 16 ||
-                    rt->size < sizeof(struct irq_routing_table))
-                        continue;
-                sum = 0;
-                for(i=0; i<rt->size; i++)
-                        sum += addr[i];
-                if (!sum) {
-                        DBG("PCI: Interrupt Routing Table found at 0x%p\n", rt);
+                rt = pirq_check_routing_table(addr);
+                if (rt)
                         return rt;
-                }
         }
         return NULL;
 }
diff --git a/arch/i386/pci/legacy.c b/arch/i386/pci/legacy.c
index 1492e3753869..149a9588c256 100644
--- a/arch/i386/pci/legacy.c
+++ b/arch/i386/pci/legacy.c
@@ -45,6 +45,8 @@ static int __init pci_legacy_init(void)
 
         printk("PCI: Probing PCI hardware\n");
         pci_root_bus = pcibios_scan_root(0);
+        if (pci_root_bus)
+                pci_bus_add_devices(pci_root_bus);
 
         pcibios_fixup_peer_bridges();
 
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index 021a50aa51f4..60f0e7a1162a 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -11,11 +11,9 @@
 
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/acpi.h>
 #include "pci.h"
 
-/* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
-u32 pci_mmcfg_base_addr;
-
 #define mmcfg_virt_addr ((void __iomem *) fix_to_virt(FIX_PCIE_MCFG))
 
 /* The base address of the last MMCONFIG device accessed */
@@ -24,10 +22,31 @@ static u32 mmcfg_last_accessed_device;
 /*
  * Functions for accessing PCI configuration space with MMCONFIG accesses
  */
+static u32 get_base_addr(unsigned int seg, int bus)
+{
+        int cfg_num = -1;
+        struct acpi_table_mcfg_config *cfg;
+
+        while (1) {
+                ++cfg_num;
+                if (cfg_num >= pci_mmcfg_config_num) {
+                        /* something bad is going on, no cfg table is found. */
+                        /* so we fall back to the old way we used to do this */
+                        /* and just rely on the first entry to be correct. */
+                        return pci_mmcfg_config[0].base_address;
+                }
+                cfg = &pci_mmcfg_config[cfg_num];
+                if (cfg->pci_segment_group_number != seg)
+                        continue;
+                if ((cfg->start_bus_number <= bus) &&
+                    (cfg->end_bus_number >= bus))
+                        return cfg->base_address;
+        }
+}
 
-static inline void pci_exp_set_dev_base(int bus, int devfn)
+static inline void pci_exp_set_dev_base(unsigned int seg, int bus, int devfn)
 {
-        u32 dev_base = pci_mmcfg_base_addr | (bus << 20) | (devfn << 12);
+        u32 dev_base = get_base_addr(seg, bus) | (bus << 20) | (devfn << 12);
         if (dev_base != mmcfg_last_accessed_device) {
                 mmcfg_last_accessed_device = dev_base;
                 set_fixmap_nocache(FIX_PCIE_MCFG, dev_base);
@@ -44,7 +63,7 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 
         spin_lock_irqsave(&pci_config_lock, flags);
 
-        pci_exp_set_dev_base(bus, devfn);
+        pci_exp_set_dev_base(seg, bus, devfn);
 
         switch (len) {
         case 1:
@@ -73,7 +92,7 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 
         spin_lock_irqsave(&pci_config_lock, flags);
 
-        pci_exp_set_dev_base(bus, devfn);
+        pci_exp_set_dev_base(seg, bus, devfn);
 
         switch (len) {
         case 1:
@@ -101,7 +120,11 @@ static int __init pci_mmcfg_init(void)
 {
         if ((pci_probe & PCI_PROBE_MMCONF) == 0)
                 goto out;
-        if (!pci_mmcfg_base_addr)
+
+        acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
+        if ((pci_mmcfg_config_num == 0) ||
+            (pci_mmcfg_config == NULL) ||
+            (pci_mmcfg_config[0].base_address == 0))
                 goto out;
 
         /* Kludge for now. Don't use mmconfig on AMD systems because
diff --git a/arch/i386/pci/numa.c b/arch/i386/pci/numa.c
index 9e3695461899..adbe17a38f6f 100644
--- a/arch/i386/pci/numa.c
+++ b/arch/i386/pci/numa.c
@@ -115,6 +115,8 @@ static int __init pci_numa_init(void)
                 return 0;
 
         pci_root_bus = pcibios_scan_root(0);
+        if (pci_root_bus)
+                pci_bus_add_devices(pci_root_bus);
         if (num_online_nodes() > 1)
                 for_each_online_node(quad) {
                         if (quad == 0)
diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h
index a8fc80ca69f3..a80f0f55ff51 100644
--- a/arch/i386/pci/pci.h
+++ b/arch/i386/pci/pci.h
@@ -27,6 +27,7 @@
 #define PCI_ASSIGN_ALL_BUSSES   0x4000
 
 extern unsigned int pci_probe;
+extern unsigned long pirq_table_addr;
 
 /* pci-i386.c */
 
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 72dfd9e7de0f..cda06f88c66e 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -236,9 +236,7 @@ acpi_parse_iosapic (acpi_table_entry_header *header, const unsigned long end)
         if (BAD_MADT_ENTRY(iosapic, end))
                 return -EINVAL;
 
-        iosapic_init(iosapic->address, iosapic->global_irq_base);
-
-        return 0;
+        return iosapic_init(iosapic->address, iosapic->global_irq_base);
 }
 
 
@@ -772,7 +770,7 @@ EXPORT_SYMBOL(acpi_unmap_lsapic);
  
 
 #ifdef CONFIG_ACPI_NUMA
-acpi_status __init
+acpi_status __devinit
 acpi_map_iosapic (acpi_handle handle, u32 depth, void *context, void **ret)
 {
         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
@@ -825,4 +823,28 @@ acpi_map_iosapic (acpi_handle handle, u32 depth, void *context, void **ret)
         return AE_OK;
 }
 #endif /* CONFIG_NUMA */
+
+int
+acpi_register_ioapic (acpi_handle handle, u64 phys_addr, u32 gsi_base)
+{
+        int err;
+
+        if ((err = iosapic_init(phys_addr, gsi_base)))
+                return err;
+
+#if CONFIG_ACPI_NUMA
+        acpi_map_iosapic(handle, 0, NULL, NULL);
+#endif /* CONFIG_ACPI_NUMA */
+
+        return 0;
+}
+EXPORT_SYMBOL(acpi_register_ioapic);
+
+int
+acpi_unregister_ioapic (acpi_handle handle, u32 gsi_base)
+{
+        return iosapic_remove(gsi_base);
+}
+EXPORT_SYMBOL(acpi_unregister_ioapic);
+
 #endif /* CONFIG_ACPI_BOOT */
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index 88b014381df5..c170be095ccd 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -129,14 +129,13 @@ static struct iosapic {
         char __iomem    *addr;          /* base address of IOSAPIC */
         unsigned int    gsi_base;       /* first GSI assigned to this IOSAPIC */
         unsigned short  num_rte;        /* number of RTE in this IOSAPIC */
+        int             rtes_inuse;     /* # of RTEs in use on this IOSAPIC */
 #ifdef CONFIG_NUMA
         unsigned short  node;           /* numa node association via pxm */
 #endif
 } iosapic_lists[NR_IOSAPICS];
 
-static int num_iosapic;
-
-static unsigned char pcat_compat __initdata;    /* 8259 compatibility flag */
+static unsigned char pcat_compat __devinitdata; /* 8259 compatibility flag */
 
 static int iosapic_kmalloc_ok;
 static LIST_HEAD(free_rte_list);
@@ -149,7 +148,7 @@ find_iosapic (unsigned int gsi)
 {
         int i;
 
-        for (i = 0; i < num_iosapic; i++) {
+        for (i = 0; i < NR_IOSAPICS; i++) {
                 if ((unsigned) (gsi - iosapic_lists[i].gsi_base) < iosapic_lists[i].num_rte)
                         return i;
         }
@@ -598,6 +597,7 @@ register_intr (unsigned int gsi, int vector, unsigned char delivery,
                 rte->refcnt++;
                 list_add_tail(&rte->rte_list, &iosapic_intr_info[vector].rtes);
                 iosapic_intr_info[vector].count++;
+                iosapic_lists[index].rtes_inuse++;
         }
         else if (vector_is_shared(vector)) {
                 struct iosapic_intr_info *info = &iosapic_intr_info[vector];
@@ -778,7 +778,7 @@ void
 iosapic_unregister_intr (unsigned int gsi)
 {
         unsigned long flags;
-        int irq, vector;
+        int irq, vector, index;
         irq_desc_t *idesc;
         u32 low32;
         unsigned long trigger, polarity;
@@ -819,6 +819,9 @@ iosapic_unregister_intr (unsigned int gsi)
                 list_del(&rte->rte_list);
                 iosapic_intr_info[vector].count--;
                 iosapic_free_rte(rte);
+                index = find_iosapic(gsi);
+                iosapic_lists[index].rtes_inuse--;
+                WARN_ON(iosapic_lists[index].rtes_inuse < 0);
 
                 trigger  = iosapic_intr_info[vector].trigger;
                 polarity = iosapic_intr_info[vector].polarity;
@@ -952,30 +955,86 @@ iosapic_system_init (int system_pcat_compat)
         }
 }
 
-void __init
+static inline int
+iosapic_alloc (void)
+{
+        int index;
+
+        for (index = 0; index < NR_IOSAPICS; index++)
+                if (!iosapic_lists[index].addr)
+                        return index;
+
+        printk(KERN_WARNING "%s: failed to allocate iosapic\n", __FUNCTION__);
+        return -1;
+}
+
+static inline void
+iosapic_free (int index)
+{
+        memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0]));
+}
+
+static inline int
+iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver)
+{
+        int index;
+        unsigned int gsi_end, base, end;
+
+        /* check gsi range */
+        gsi_end = gsi_base + ((ver >> 16) & 0xff);
+        for (index = 0; index < NR_IOSAPICS; index++) {
+                if (!iosapic_lists[index].addr)
+                        continue;
+
+                base = iosapic_lists[index].gsi_base;
+                end  = base + iosapic_lists[index].num_rte - 1;
+
+                if (gsi_base < base && gsi_end < base)
+                        continue;/* OK */
+
+                if (gsi_base > end && gsi_end > end)
+                        continue; /* OK */
+
+                return -EBUSY;
+        }
+        return 0;
+}
+
+int __devinit
 iosapic_init (unsigned long phys_addr, unsigned int gsi_base)
 {
-        int num_rte;
+        int num_rte, err, index;
         unsigned int isa_irq, ver;
         char __iomem *addr;
+        unsigned long flags;
+
+        spin_lock_irqsave(&iosapic_lock, flags);
+        {
+                addr = ioremap(phys_addr, 0);
+                ver = iosapic_version(addr);
 
-        addr = ioremap(phys_addr, 0);
-        ver = iosapic_version(addr);
+                if ((err = iosapic_check_gsi_range(gsi_base, ver))) {
+                        iounmap(addr);
+                        spin_unlock_irqrestore(&iosapic_lock, flags);
+                        return err;
+                }
 
-        /*
-         * The MAX_REDIR register holds the highest input pin
-         * number (starting from 0).
-         * We add 1 so that we can use it for number of pins (= RTEs)
-         */
-        num_rte = ((ver >> 16) & 0xff) + 1;
+                /*
+                 * The MAX_REDIR register holds the highest input pin
+                 * number (starting from 0).
+                 * We add 1 so that we can use it for number of pins (= RTEs)
+                 */
+                num_rte = ((ver >> 16) & 0xff) + 1;
 
-        iosapic_lists[num_iosapic].addr = addr;
-        iosapic_lists[num_iosapic].gsi_base = gsi_base;
-        iosapic_lists[num_iosapic].num_rte = num_rte;
+                index = iosapic_alloc();
+                iosapic_lists[index].addr = addr;
+                iosapic_lists[index].gsi_base = gsi_base;
+                iosapic_lists[index].num_rte = num_rte;
 #ifdef CONFIG_NUMA
-        iosapic_lists[num_iosapic].node = MAX_NUMNODES;
+                iosapic_lists[index].node = MAX_NUMNODES;
 #endif
-        num_iosapic++;
+        }
+        spin_unlock_irqrestore(&iosapic_lock, flags);
 
         if ((gsi_base == 0) && pcat_compat) {
                 /*
@@ -986,10 +1045,43 @@ iosapic_init (unsigned long phys_addr, unsigned int gsi_base)
                 for (isa_irq = 0; isa_irq < 16; ++isa_irq)
                         iosapic_override_isa_irq(isa_irq, isa_irq, IOSAPIC_POL_HIGH, IOSAPIC_EDGE);
         }
+        return 0;
+}
+
+#ifdef CONFIG_HOTPLUG
+int
+iosapic_remove (unsigned int gsi_base)
+{
+        int index, err = 0;
+        unsigned long flags;
+
+        spin_lock_irqsave(&iosapic_lock, flags);
+        {
+                index = find_iosapic(gsi_base);
+                if (index < 0) {
+                        printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n",
+                               __FUNCTION__, gsi_base);
+                        goto out;
+                }
+
+                if (iosapic_lists[index].rtes_inuse) {
+                        err = -EBUSY;
+                        printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n",
+                               __FUNCTION__, gsi_base);
+                        goto out;
+                }
+
+                iounmap(iosapic_lists[index].addr);
+                iosapic_free(index);
+        }
+ out:
+        spin_unlock_irqrestore(&iosapic_lock, flags);
+        return err;
 }
+#endif /* CONFIG_HOTPLUG */
 
 #ifdef CONFIG_NUMA
-void __init
+void __devinit
 map_iosapic_to_node(unsigned int gsi_base, int node)
 {
         int index;
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index e3fc4edea113..720a861f88be 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -312,7 +312,7 @@ pci_acpi_scan_root(struct acpi_device *device, int domain, int bus)
         acpi_walk_resources(device->handle, METHOD_NAME__CRS, add_window,
                         &info);
 
-        pbus = pci_scan_bus(bus, &pci_root_ops, controller);
+        pbus = pci_scan_bus_parented(NULL, bus, &pci_root_ops, controller);
         if (pbus)
                 pcibios_setup_root_windows(pbus, controller);
 
@@ -373,6 +373,25 @@ void pcibios_bus_to_resource(struct pci_dev *dev,
         res->end = region->end + offset;
 }
 
+static int __devinit is_valid_resource(struct pci_dev *dev, int idx)
+{
+        unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+        struct resource *devr = &dev->resource[idx];
+
+        if (!dev->bus)
+                return 0;
+        for (i=0; i<PCI_BUS_NUM_RESOURCES; i++) {
+                struct resource *busr = dev->bus->resource[i];
+
+                if (!busr || ((busr->flags ^ devr->flags) & type_mask))
+                        continue;
+                if ((devr->start) && (devr->start >= busr->start) &&
+                                (devr->end <= busr->end))
+                        return 1;
+        }
+        return 0;
+}
+
 static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
 {
         struct pci_bus_region region;
@@ -386,7 +405,8 @@ static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
                 region.start = dev->resource[i].start;
                 region.end = dev->resource[i].end;
                 pcibios_bus_to_resource(dev, &dev->resource[i], &region);
-                pci_claim_resource(dev, i);
+                if ((is_valid_resource(dev, i)))
+                        pci_claim_resource(dev, i);
         }
 }
 
@@ -398,6 +418,10 @@ pcibios_fixup_bus (struct pci_bus *b)
 {
         struct pci_dev *dev;
 
+        if (b->self) {
+                pci_read_bridge_bases(b);
+                pcibios_fixup_device_resources(b->self);
+        }
         list_for_each_entry(dev, &b->devices, bus_list)
                 pcibios_fixup_device_resources(dev);
 
@@ -418,18 +442,24 @@ pcibios_enable_resources (struct pci_dev *dev, int mask)
         u16 cmd, old_cmd;
         int idx;
         struct resource *r;
+        unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
 
         if (!dev)
                 return -EINVAL;
 
         pci_read_config_word(dev, PCI_COMMAND, &cmd);
         old_cmd = cmd;
-        for (idx=0; idx<6; idx++) {
+        for (idx=0; idx<PCI_NUM_RESOURCES; idx++) {
                 /* Only set up the desired resources.  */
                 if (!(mask & (1 << idx)))
                         continue;
 
                 r = &dev->resource[idx];
+                if (!(r->flags & type_mask))
+                        continue;
+                if ((idx == PCI_ROM_RESOURCE) &&
+                                (!(r->flags & IORESOURCE_ROM_ENABLE)))
+                        continue;
                 if (!r->start && r->end) {
                         printk(KERN_ERR
                                "PCI: Device %s not available because of resource collisions\n",
@@ -441,8 +471,6 @@ pcibios_enable_resources (struct pci_dev *dev, int mask)
                 if (r->flags & IORESOURCE_MEM)
                         cmd |= PCI_COMMAND_MEMORY;
         }
-        if (dev->resource[PCI_ROM_RESOURCE].start)
-                cmd |= PCI_COMMAND_MEMORY;
         if (cmd != old_cmd) {
                 printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
                 pci_write_config_word(dev, PCI_COMMAND, cmd);
diff --git a/arch/ppc/kernel/pci.c b/arch/ppc/kernel/pci.c
index 6d7b92d72458..70cfb6ffd877 100644
--- a/arch/ppc/kernel/pci.c
+++ b/arch/ppc/kernel/pci.c
@@ -1495,7 +1495,7 @@ static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
                 *offset += hose->pci_mem_offset;
                 res_bit = IORESOURCE_MEM;
         } else {
-                io_offset = (unsigned long)hose->io_base_virt;
+                io_offset = hose->io_base_virt - ___IO_BASE;
                 *offset += io_offset;
                 res_bit = IORESOURCE_IO;
         }
@@ -1522,7 +1522,7 @@ static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
 
                 /* found it! construct the final physical address */
                 if (mmap_state == pci_mmap_io)
-                        *offset += hose->io_base_phys - _IO_BASE;
+                        *offset += hose->io_base_phys - io_offset;
                 return rp;
         }
 
@@ -1739,6 +1739,23 @@ long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
         return result;
 }
 
+void pci_resource_to_user(const struct pci_dev *dev, int bar,
+                          const struct resource *rsrc,
+                          u64 *start, u64 *end)
+{
+        struct pci_controller *hose = pci_bus_to_hose(dev->bus->number);
+        unsigned long offset = 0;
+
+        if (hose == NULL)
+                return;
+
+        if (rsrc->flags & IORESOURCE_IO)
+                offset = ___IO_BASE - hose->io_base_virt + hose->io_base_phys;
+
+        *start = rsrc->start + offset;
+        *end = rsrc->end + offset;
+}
+
 void __init
 pci_init_resource(struct resource *res, unsigned long start, unsigned long end,
                   int flags, char *name)
diff --git a/arch/ppc64/kernel/pci.c b/arch/ppc64/kernel/pci.c
index 580676f87d23..ae6f579d3fa0 100644
--- a/arch/ppc64/kernel/pci.c
+++ b/arch/ppc64/kernel/pci.c
@@ -351,7 +351,7 @@ static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
                 *offset += hose->pci_mem_offset;
                 res_bit = IORESOURCE_MEM;
         } else {
-                io_offset = (unsigned long)hose->io_base_virt;
+                io_offset = (unsigned long)hose->io_base_virt - pci_io_base;
                 *offset += io_offset;
                 res_bit = IORESOURCE_IO;
         }
@@ -378,7 +378,7 @@ static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
 
                 /* found it! construct the final physical address */
                 if (mmap_state == pci_mmap_io)
-                        *offset += hose->io_base_phys - io_offset;
+                        *offset += hose->io_base_phys - io_offset;
                 return rp;
         }
 
@@ -944,4 +944,22 @@ int pci_read_irq_line(struct pci_dev *pci_dev)
 }
 EXPORT_SYMBOL(pci_read_irq_line);
 
+void pci_resource_to_user(const struct pci_dev *dev, int bar,
+                          const struct resource *rsrc,
+                          u64 *start, u64 *end)
+{
+        struct pci_controller *hose = pci_bus_to_host(dev->bus);
+        unsigned long offset = 0;
+
+        if (hose == NULL)
+                return;
+
+        if (rsrc->flags & IORESOURCE_IO)
+                offset = pci_io_base - (unsigned long)hose->io_base_virt +
+                        hose->io_base_phys;
+
+        *start = rsrc->start + offset;
+        *end = rsrc->end + offset;
+}
+
 #endif /* CONFIG_PPC_MULTIPLATFORM */
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index b693c232fd07..657e88aa0902 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -7,25 +7,50 @@
 
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/acpi.h>
 #include "pci.h"
 
 #define MMCONFIG_APER_SIZE (256*1024*1024)
 
-/* The physical address of the MMCONFIG aperture.  Set from ACPI tables. */
-u32 pci_mmcfg_base_addr;
-
 /* Static virtual mapping of the MMCONFIG aperture */
-char *pci_mmcfg_virt;
+struct mmcfg_virt {
+        struct acpi_table_mcfg_config *cfg;
+        char *virt;
+};
+static struct mmcfg_virt *pci_mmcfg_virt;
 
-static inline char *pci_dev_base(unsigned int bus, unsigned int devfn)
+static char *get_virt(unsigned int seg, int bus)
 {
-        return pci_mmcfg_virt + ((bus << 20) | (devfn << 12));
+        int cfg_num = -1;
+        struct acpi_table_mcfg_config *cfg;
+
+        while (1) {
+                ++cfg_num;
+                if (cfg_num >= pci_mmcfg_config_num) {
+                        /* something bad is going on, no cfg table is found. */
+                        /* so we fall back to the old way we used to do this */
+                        /* and just rely on the first entry to be correct. */
+                        return pci_mmcfg_virt[0].virt;
+                }
+                cfg = pci_mmcfg_virt[cfg_num].cfg;
+                if (cfg->pci_segment_group_number != seg)
+                        continue;
+                if ((cfg->start_bus_number <= bus) &&
+                    (cfg->end_bus_number >= bus))
+                        return pci_mmcfg_virt[cfg_num].virt;
+        }
+}
+
+static inline char *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
+{
+
+        return get_virt(seg, bus) + ((bus << 20) | (devfn << 12));
 }
 
 static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
                           unsigned int devfn, int reg, int len, u32 *value)
 {
-        char *addr = pci_dev_base(bus, devfn); 
+        char *addr = pci_dev_base(seg, bus, devfn);
 
         if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095)))
                 return -EINVAL;
@@ -48,7 +73,7 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
                            unsigned int devfn, int reg, int len, u32 value)
 {
-        char *addr = pci_dev_base(bus,devfn);
+        char *addr = pci_dev_base(seg, bus, devfn);
 
         if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095)))
                 return -EINVAL;
@@ -75,9 +100,15 @@ static struct pci_raw_ops pci_mmcfg = {
 
 static int __init pci_mmcfg_init(void)
 {
+        int i;
+
         if ((pci_probe & PCI_PROBE_MMCONF) == 0)
                 return 0;
-        if (!pci_mmcfg_base_addr)
+
+        acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
+        if ((pci_mmcfg_config_num == 0) ||
+            (pci_mmcfg_config == NULL) ||
+            (pci_mmcfg_config[0].base_address == 0))
                 return 0;
 
         /* Kludge for now. Don't use mmconfig on AMD systems because
@@ -88,13 +119,22 @@ static int __init pci_mmcfg_init(void)
                 return 0; 
 
         /* RED-PEN i386 doesn't do _nocache right now */
-        pci_mmcfg_virt = ioremap_nocache(pci_mmcfg_base_addr, MMCONFIG_APER_SIZE);
-        if (!pci_mmcfg_virt) { 
-                printk("PCI: Cannot map mmconfig aperture\n");
+        pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * pci_mmcfg_config_num, GFP_KERNEL);
+        if (pci_mmcfg_virt == NULL) {
+                printk("PCI: Can not allocate memory for mmconfig structures\n");
                 return 0;
-        }       
+        }
+        for (i = 0; i < pci_mmcfg_config_num; ++i) {
+                pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i];
+                pci_mmcfg_virt[i].virt = ioremap_nocache(pci_mmcfg_config[i].base_address, MMCONFIG_APER_SIZE);
+                if (!pci_mmcfg_virt[i].virt) {
+                        printk("PCI: Cannot map mmconfig aperture for segment %d\n",
+                               pci_mmcfg_config[i].pci_segment_group_number);
+                        return 0;
+                }
+                printk(KERN_INFO "PCI: Using MMCONFIG at %x\n", pci_mmcfg_config[i].base_address);
+        }
 
-        printk(KERN_INFO "PCI: Using MMCONFIG at %x\n", pci_mmcfg_base_addr);
         raw_pci_ops = &pci_mmcfg;
         pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;