Commit b2ad7b5e authored by Paul Mackerras's avatar Paul Mackerras
Browse files

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: default avatarPaul Mackerras <paulus@samba.org>
parent 76637536

arch/ppc64/kernel/misc.S

+3 −3
Original line number Diff line number Diff line
@@ -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

arch/ppc64/kernel/pci.c

+60 −0
Original line number Diff line number Diff line
@@ -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;

}

arch/ppc64/kernel/sys_ppc32.c

+1 −54
Original line number Diff line number Diff line
@@ -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);

}

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