Allow PCI config space syscalls to be used by 64-bit processes.

The pciconfig_iobase, pciconfig_read and pciconfig_write system calls
were only implemented for 32-bit processes; for 64-bit processes they
returned an ENOSYS error.  This allows them to be used by 64-bit
processes as well.  The X server uses pciconfig_iobase at least, and
this change is necessary to allow a 64-bit X server to work on my G5.

Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 64 insertions, 57 deletions

diff --git a/arch/ppc64/kernel/misc.S b/arch/ppc64/kernel/misc.S
index 6d860c1d9fa0..c047663eb48d 100644
--- a/arch/ppc64/kernel/misc.S
+++ b/arch/ppc64/kernel/misc.S
@@ -1431,9 +1431,9 @@ _GLOBAL(sys_call_table)
         .llong .sys_ni_syscall          /* 195 - 32bit only stat64 */
         .llong .sys_ni_syscall          /* 32bit only lstat64 */
         .llong .sys_ni_syscall          /* 32bit only fstat64 */
-        .llong .sys_ni_syscall          /* 32bit only pciconfig_read */
-        .llong .sys_ni_syscall          /* 32bit only pciconfig_write */
-        .llong .sys_ni_syscall          /* 32bit only pciconfig_iobase */
+        .llong .sys_pciconfig_read
+        .llong .sys_pciconfig_write
+        .llong .sys_pciconfig_iobase    /* 200 - pciconfig_iobase */
         .llong .sys_ni_syscall          /* reserved for MacOnLinux */
         .llong .sys_getdents64
         .llong .sys_pivot_root
diff --git a/arch/ppc64/kernel/pci.c b/arch/ppc64/kernel/pci.c
index 446b4654883f..8447dcc2c2b3 100644
--- a/arch/ppc64/kernel/pci.c
+++ b/arch/ppc64/kernel/pci.c
@@ -21,6 +21,7 @@
 #include <linux/bootmem.h>
 #include <linux/mm.h>
 #include <linux/list.h>
+#include <linux/syscalls.h>
 
 #include <asm/processor.h>
 #include <asm/io.h>
@@ -984,3 +985,62 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
 }
 
 #endif /* CONFIG_PPC_MULTIPLATFORM */
+
+
+#define IOBASE_BRIDGE_NUMBER    0
+#define IOBASE_MEMORY           1
+#define IOBASE_IO               2
+#define IOBASE_ISA_IO           3
+#define IOBASE_ISA_MEM          4
+
+long sys_pciconfig_iobase(long which, unsigned long in_bus,
+                          unsigned long in_devfn)
+{
+        struct pci_controller* hose;
+        struct list_head *ln;
+        struct pci_bus *bus = NULL;
+        struct device_node *hose_node;
+
+        /* Argh ! Please forgive me for that hack, but that's the
+         * simplest way to get existing XFree to not lockup on some
+         * G5 machines... So when something asks for bus 0 io base
+         * (bus 0 is HT root), we return the AGP one instead.
+         */
+#ifdef CONFIG_PPC_PMAC
+        if (systemcfg->platform == PLATFORM_POWERMAC &&
+            machine_is_compatible("MacRISC4"))
+                if (in_bus == 0)
+                        in_bus = 0xf0;
+#endif /* CONFIG_PPC_PMAC */
+
+        /* That syscall isn't quite compatible with PCI domains, but it's
+         * used on pre-domains setup. We return the first match
+         */
+
+        for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
+                bus = pci_bus_b(ln);
+                if (in_bus >= bus->number && in_bus < (bus->number + bus->subordinate))
+                        break;
+                bus = NULL;
+        }
+        if (bus == NULL || bus->sysdata == NULL)
+                return -ENODEV;
+
+        hose_node = (struct device_node *)bus->sysdata;
+        hose = PCI_DN(hose_node)->phb;
+
+        switch (which) {
+        case IOBASE_BRIDGE_NUMBER:
+                return (long)hose->first_busno;
+        case IOBASE_MEMORY:
+                return (long)hose->pci_mem_offset;
+        case IOBASE_IO:
+                return (long)hose->io_base_phys;
+        case IOBASE_ISA_IO:
+                return (long)isa_io_base;
+        case IOBASE_ISA_MEM:
+                return -EINVAL;
+        }
+
+        return -EOPNOTSUPP;
+}
diff --git a/arch/ppc64/kernel/sys_ppc32.c b/arch/ppc64/kernel/sys_ppc32.c
index 57a6db7d7c9c..e93c13458910 100644
--- a/arch/ppc64/kernel/sys_ppc32.c
+++ b/arch/ppc64/kernel/sys_ppc32.c
@@ -708,62 +708,9 @@ asmlinkage int sys32_pciconfig_write(u32 bus, u32 dfn, u32 off, u32 len, u32 ubu
                                    compat_ptr(ubuf));
 }
 
-#define IOBASE_BRIDGE_NUMBER    0
-#define IOBASE_MEMORY           1
-#define IOBASE_IO               2
-#define IOBASE_ISA_IO           3
-#define IOBASE_ISA_MEM          4
-
 asmlinkage int sys32_pciconfig_iobase(u32 which, u32 in_bus, u32 in_devfn)
 {
-#ifdef CONFIG_PCI
-        struct pci_controller* hose;
-        struct list_head *ln;
-        struct pci_bus *bus = NULL;
-        struct device_node *hose_node;
-
-        /* Argh ! Please forgive me for that hack, but that's the
-         * simplest way to get existing XFree to not lockup on some
-         * G5 machines... So when something asks for bus 0 io base
-         * (bus 0 is HT root), we return the AGP one instead.
-         */
-#ifdef CONFIG_PPC_PMAC
-        if (systemcfg->platform == PLATFORM_POWERMAC &&
-            machine_is_compatible("MacRISC4"))
-                if (in_bus == 0)
-                        in_bus = 0xf0;
-#endif /* CONFIG_PPC_PMAC */
-
-        /* That syscall isn't quite compatible with PCI domains, but it's
-         * used on pre-domains setup. We return the first match
-         */
-
-        for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
-                bus = pci_bus_b(ln);
-                if (in_bus >= bus->number && in_bus < (bus->number + bus->subordinate))
-                        break;
-                bus = NULL;
-        }
-        if (bus == NULL || bus->sysdata == NULL)
-                return -ENODEV;
-
-        hose_node = bus->sysdata;
-        hose = PCI_DN(hose_node)->phb;
-
-        switch (which) {
-        case IOBASE_BRIDGE_NUMBER:
-                return (long)hose->first_busno;
-        case IOBASE_MEMORY:
-                return (long)hose->pci_mem_offset;
-        case IOBASE_IO:
-                return (long)hose->io_base_phys;
-        case IOBASE_ISA_IO:
-                return (long)isa_io_base;
-        case IOBASE_ISA_MEM:
-                return -EINVAL;
-        }
-#endif  /* CONFIG_PCI */
-        return -EOPNOTSUPP;
+        return sys_pciconfig_iobase(which, in_bus, in_devfn);
 }