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Commit 833b441e authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
Browse files

s390: enable processes for mio instructions 



Allow for userspace to use PCI MIO instructions.

Signed-off-by: default avatarSebastian Ott <sebott@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 56271303

arch/s390/include/asm/pci_insn.h

+10 −0
Original line number Diff line number Diff line
@@ -143,4 +143,14 @@ static inline int zpci_set_irq_ctrl(u16 ctl, u8 isc) 
	return __zpci_set_irq_ctrl(ctl, isc, &iib);

}



#ifdef CONFIG_PCI

static inline void enable_mio_ctl(void)

{

	if (static_branch_likely(&have_mio))

		__ctl_set_bit(2, 5);

}

#else /* CONFIG_PCI */

static inline void enable_mio_ctl(void) {}

#endif /* CONFIG_PCI */



#endif

arch/s390/kernel/early.c

+2 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <asm/sclp.h>

#include <asm/facility.h>

#include <asm/boot_data.h>

#include <asm/pci_insn.h>

#include "entry.h"



/*
@@ -235,6 +236,7 @@ static __init void detect_machine_facilities(void) 
		clock_comparator_max = -1ULL >> 1;

		__ctl_set_bit(0, 53);

	}

	enable_mio_ctl();

}



static inline void save_vector_registers(void)