path: root/arch/s390/include/asm/idle.h
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authorSven Schnelle <svens@linux.ibm.com>2020-11-21 11:14:56 +0100
committerVasily Gorbik <gor@linux.ibm.com>2021-01-19 12:29:26 +0100
commit56e62a73702836017564eaacd5212e4d0fa1c01d (patch)
treef99a6cb9175ddddc37f36ad538555fbb5c606a6c /arch/s390/include/asm/idle.h
parentac94a2911e84a7b3d29d725f8f43b07db1c916f2 (diff)
s390: convert to generic entry
This patch converts s390 to use the generic entry infrastructure from kernel/entry/*. There are a few special things on s390: - PIF_PER_TRAP is moved to TIF_PER_TRAP as the generic code doesn't know about our PIF flags in exit_to_user_mode_loop(). - The old code had several ways to restart syscalls: a) PIF_SYSCALL_RESTART, which was only set during execve to force a restart after upgrading a process (usually qemu-kvm) to pgste page table extensions. b) PIF_SYSCALL, which is set by do_signal() to indicate that the current syscall should be restarted. This is changed so that do_signal() now also uses PIF_SYSCALL_RESTART. Continuing to use PIF_SYSCALL doesn't work with the generic code, and changing it to PIF_SYSCALL_RESTART makes PIF_SYSCALL and PIF_SYSCALL_RESTART more unique. - On s390 calling sys_sigreturn or sys_rt_sigreturn is implemented by executing a svc instruction on the process stack which causes a fault. While handling that fault the fault code sets PIF_SYSCALL to hand over processing to the syscall code on exit to usermode. The patch introduces PIF_SYSCALL_RET_SET, which is set if ptrace sets a return value for a syscall. The s390x ptrace ABI uses r2 both for the syscall number and return value, so ptrace cannot set the syscall number + return value at the same time. The flag makes handling that a bit easier. do_syscall() will just skip executing the syscall if PIF_SYSCALL_RET_SET is set. CONFIG_DEBUG_ASCE was removd in favour of the generic CONFIG_DEBUG_ENTRY. CR1/7/13 will be checked both on kernel entry and exit to contain the correct asces. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/idle.h')
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/include/asm/idle.h b/arch/s390/include/asm/idle.h
index 6d4226dcf42a..b04f6a794cdf 100644
--- a/arch/s390/include/asm/idle.h
+++ b/arch/s390/include/asm/idle.h
@@ -20,11 +20,13 @@ struct s390_idle_data {
unsigned long long clock_idle_exit;
unsigned long long timer_idle_enter;
unsigned long long timer_idle_exit;
+ unsigned long mt_cycles_enter[8];
extern struct device_attribute dev_attr_idle_count;
extern struct device_attribute dev_attr_idle_time_us;
-void psw_idle(struct s390_idle_data *, unsigned long);
+void psw_idle(struct s390_idle_data *data, unsigned long psw_mask);
+void psw_idle_exit(void);
#endif /* _S390_IDLE_H */

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