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Commit 4eafad7f authored by Alexey Ishchuk's avatar Alexey Ishchuk Committed by Martin Schwidefsky
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s390/kernel: add system calls for PCI memory access 



Add the new __NR_s390_pci_mmio_write and __NR_s390_pci_mmio_read
system calls to allow user space applications to access device PCI I/O
memory pages on s390x platform.

[ Martin Schwidefsky: some code beautification ]

Signed-off-by: default avatarAlexey Ishchuk <aishchuk@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 86c558e8

arch/s390/include/uapi/asm/unistd.h

+3 −1
Original line number Diff line number Diff line
@@ -287,7 +287,9 @@ 
#define __NR_getrandom		349

#define __NR_memfd_create	350

#define __NR_bpf		351

#define NR_syscalls 352

#define __NR_s390_pci_mmio_write	352

#define __NR_s390_pci_mmio_read		353

#define NR_syscalls 354



/* 

 * There are some system calls that are not present on 64 bit, some

arch/s390/kernel/compat_wrapper.c

+2 −0
Original line number Diff line number Diff line
@@ -218,3 +218,5 @@ COMPAT_SYSCALL_WRAP3(seccomp, unsigned int, op, unsigned int, flags, const char 
COMPAT_SYSCALL_WRAP3(getrandom, char __user *, buf, size_t, count, unsigned int, flags)

COMPAT_SYSCALL_WRAP2(memfd_create, const char __user *, uname, unsigned int, flags)

COMPAT_SYSCALL_WRAP3(bpf, int, cmd, union bpf_attr *, attr, unsigned int, size);

COMPAT_SYSCALL_WRAP3(s390_pci_mmio_write, const unsigned long, mmio_addr, const void __user *, user_buffer, const size_t, length);

COMPAT_SYSCALL_WRAP3(s390_pci_mmio_read, const unsigned long, mmio_addr, void __user *, user_buffer, const size_t, length);

arch/s390/kernel/entry.h

+2 −0
Original line number Diff line number Diff line
@@ -74,4 +74,6 @@ struct old_sigaction; 
long sys_s390_personality(unsigned int personality);

long sys_s390_runtime_instr(int command, int signum);



long sys_s390_pci_mmio_write(unsigned long, const void __user *, size_t);

long sys_s390_pci_mmio_read(unsigned long, void __user *, size_t);

#endif /* _ENTRY_H */

arch/s390/kernel/syscalls.S

+2 −0
Original line number Diff line number Diff line
@@ -360,3 +360,5 @@ SYSCALL(sys_seccomp,sys_seccomp,compat_sys_seccomp) 
SYSCALL(sys_getrandom,sys_getrandom,compat_sys_getrandom)

SYSCALL(sys_memfd_create,sys_memfd_create,compat_sys_memfd_create) /* 350 */

SYSCALL(sys_bpf,sys_bpf,compat_sys_bpf)

SYSCALL(sys_ni_syscall,sys_s390_pci_mmio_write,compat_sys_s390_pci_mmio_write)

SYSCALL(sys_ni_syscall,sys_s390_pci_mmio_read,compat_sys_s390_pci_mmio_read)

arch/s390/pci/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -3,4 +3,4 @@ 
#



obj-$(CONFIG_PCI)	+= pci.o pci_dma.o pci_clp.o pci_sysfs.o \

			   pci_event.o pci_debug.o pci_insn.o
 
			   pci_event.o pci_debug.o pci_insn.o pci_mmio.o