Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:
 "Just a random collection of bug-fixes and cleanups, nothing new in
  this merge request."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (46 commits)
  s390/ap: Fix wrong or missing comments
  s390/ap: move receive callback to message struct
  s390/dasd: re-prioritize partition detection message
  s390/qeth: reshuffle initialization
  s390/qeth: cleanup drv attr usage
  s390/claw: cleanup drv attr usage
  s390/lcs: cleanup drv attr usage
  s390/ctc: cleanup drv attr usage
  s390/ccwgroup: remove ccwgroup_create_from_string
  s390/qeth: stop using struct ccwgroup driver for discipline callbacks
  s390/qeth: switch to ccwgroup_create_dev
  s390/claw: switch to ccwgroup_create_dev
  s390/lcs: switch to ccwgroup_create_dev
  s390/ctcm: switch to ccwgroup_create_dev
  s390/ccwgroup: exploit ccwdev_by_dev_id
  s390/ccwgroup: introduce ccwgroup_create_dev
  s390: fix race on TIF_MCCK_PENDING
  s390/barrier: make use of fast-bcr facility
  s390/barrier: cleanup barrier functions
  s390/claw: remove "eieio" calls
  ...

1 files changed, 28 insertions, 23 deletions

diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 4e1c292fa7e3..229fe1d07749 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -81,16 +81,14 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
 
 	.macro	HANDLE_SIE_INTERCEPT scratch
 #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
-	tm	__TI_flags+6(%r12),_TIF_SIE>>8
-	jz	.+42
-	tm	__LC_MACHINE_FLAGS+6,0x20	# MACHINE_FLAG_SPP
-	jz	.+8
-	.insn	s,0xb2800000,BASED(.Lhost_id)	# set host id
+	tmhh	%r8,0x0001		# interrupting from user ?
+	jnz	.+42
 	lgr	\scratch,%r9
 	slg	\scratch,BASED(.Lsie_loop)
 	clg	\scratch,BASED(.Lsie_length)
-	jhe	.+10
+	jhe	.+22
 	lg	%r9,BASED(.Lsie_loop)
+	SPP	BASED(.Lhost_id)	# set host id
 #endif
 	.endm
 
@@ -148,6 +146,14 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
 	ssm	__LC_RETURN_PSW
 	.endm
 
+	.macro STCK savearea
+#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
+	.insn	s,0xb27c0000,\savearea		# store clock fast
+#else
+	.insn	s,0xb2050000,\savearea		# store clock
+#endif
+	.endm
+
 	.section .kprobes.text, "ax"
 
 /*
@@ -158,22 +164,23 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
  *  gpr2 = prev
  */
 ENTRY(__switch_to)
+	stmg	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
+	stg	%r15,__THREAD_ksp(%r2)		# store kernel stack of prev
 	lg	%r4,__THREAD_info(%r2)		# get thread_info of prev
 	lg	%r5,__THREAD_info(%r3)		# get thread_info of next
+	lgr	%r15,%r5
+	aghi	%r15,STACK_SIZE			# end of kernel stack of next
+	stg	%r3,__LC_CURRENT		# store task struct of next
+	stg	%r5,__LC_THREAD_INFO		# store thread info of next
+	stg	%r15,__LC_KERNEL_STACK		# store end of kernel stack
+	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
+	mvc	__LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
+	lg	%r15,__THREAD_ksp(%r3)		# load kernel stack of next
 	tm	__TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
 	jz	0f
 	ni	__TI_flags+7(%r4),255-_TIF_MCCK_PENDING	# clear flag in prev
 	oi	__TI_flags+7(%r5),_TIF_MCCK_PENDING	# set it in next
-0:	stmg	%r6,%r15,__SF_GPRS(%r15)	# store gprs of prev task
-	stg	%r15,__THREAD_ksp(%r2)		# store kernel stack of prev
-	lg	%r15,__THREAD_ksp(%r3)		# load kernel stack of next
-	lctl	%c4,%c4,__TASK_pid(%r3)		# load pid to control reg. 4
-	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
-	stg	%r3,__LC_CURRENT		# store task struct of next
-	mvc	__LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next
-	stg	%r5,__LC_THREAD_INFO		# store thread info of next
-	aghi	%r5,STACK_SIZE			# end of kernel stack of next
-	stg	%r5,__LC_KERNEL_STACK		# store end of kernel stack
+0:	lmg	%r6,%r15,__SF_GPRS(%r15)	# load gprs of next task
 	br	%r14
 
 __critical_start:
@@ -458,7 +465,7 @@ pgm_svcper:
  * IO interrupt handler routine
  */
 ENTRY(io_int_handler)
-	stck	__LC_INT_CLOCK
+	STCK	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
 	lg	%r10,__LC_LAST_BREAK
@@ -604,7 +611,7 @@ io_notify_resume:
  * External interrupt handler routine
  */
 ENTRY(ext_int_handler)
-	stck	__LC_INT_CLOCK
+	STCK	__LC_INT_CLOCK
 	stpt	__LC_ASYNC_ENTER_TIMER
 	stmg	%r8,%r15,__LC_SAVE_AREA_ASYNC
 	lg	%r10,__LC_LAST_BREAK
@@ -622,6 +629,7 @@ ext_skip:
 	mvc	__PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
 	stmg	%r8,%r9,__PT_PSW(%r11)
 	TRACE_IRQS_OFF
+	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
 	lghi	%r1,4096
 	lgr	%r2,%r11		# pass pointer to pt_regs
 	llgf	%r3,__LC_EXT_CPU_ADDR	# get cpu address + interruption code
@@ -638,7 +646,7 @@ ENTRY(psw_idle)
 	larl	%r1,psw_idle_lpsw+4
 	stg	%r1,__SF_EMPTY+8(%r15)
 	larl	%r1,.Lvtimer_max
-	stck	__IDLE_ENTER(%r2)
+	STCK	__IDLE_ENTER(%r2)
 	ltr	%r5,%r5
 	stpt	__VQ_IDLE_ENTER(%r3)
 	jz	psw_idle_lpsw
@@ -654,7 +662,7 @@ __critical_end:
  * Machine check handler routines
  */
 ENTRY(mcck_int_handler)
-	stck	__LC_MCCK_CLOCK
+	STCK	__LC_MCCK_CLOCK
 	la	%r1,4095		# revalidate r1
 	spt	__LC_CPU_TIMER_SAVE_AREA-4095(%r1)	# revalidate cpu timer
 	lmg	%r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
@@ -967,7 +975,6 @@ ENTRY(sie64a)
 	xc	__SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # host id == 0
 	lmg	%r0,%r13,0(%r3)			# load guest gprs 0-13
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
-	oi	__TI_flags+6(%r14),_TIF_SIE>>8
 sie_loop:
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
 	tm	__TI_flags+7(%r14),_TIF_EXIT_SIE
@@ -985,7 +992,6 @@ sie_done:
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
 sie_exit:
 	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
-	ni	__TI_flags+6(%r14),255-(_TIF_SIE>>8)
 	lg	%r14,__SF_EMPTY+8(%r15)		# load guest register save area
 	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13
 	lmg	%r6,%r14,__SF_GPRS(%r15)	# restore kernel registers
@@ -994,7 +1000,6 @@ sie_exit:
 sie_fault:
 	lctlg	%c1,%c1,__LC_USER_ASCE		# load primary asce
 	lg	%r14,__LC_THREAD_INFO		# pointer thread_info struct
-	ni	__TI_flags+6(%r14),255-(_TIF_SIE>>8)
 	lg	%r14,__SF_EMPTY+8(%r15)		# load guest register save area
 	stmg	%r0,%r13,0(%r14)		# save guest gprs 0-13
 	lmg	%r6,%r14,__SF_GPRS(%r15)	# restore kernel registers