Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] signal: use set_restore_sigmask() helper
  [S390] smp: remove pointless comments in startup_secondary()
  [S390] qdio: Use kstrtoul_from_user
  [S390] sclp_async: Use kstrtoul_from_user
  [S390] exec: remove redundant set_fs(USER_DS)
  [S390] cpu hotplug: on cpu start wait until being marked active
  [S390] signal: convert to use set_current_blocked()
  [S390] asm offsets: fix coding style
  [S390] Add support for IBM zEnterprise 114
  [S390] dasd: check if raw track access is supported
  [S390] Use diagnose 308 for system reset
  [S390] Export store_status() function
  [S390] dasd: use vmalloc for statistics input buffer
  [S390] Add PSW restart shutdown trigger
  [S390] missing return in page_table_alloc_pgste
  [S390] qdio: 2nd stage retry on SIGA-W busy conditions

arch/s390/Kconfig

@@ -274,11 +274,11 @@ config MARCH_Z10
 	  on older machines.
 
 config MARCH_Z196
-	bool "IBM zEnterprise 196"
+	bool "IBM zEnterprise 114 and 196"
 	help
-	  Select this to enable optimizations for IBM zEnterprise 196
-	  (2817 series). The kernel will be slightly faster but will not work
-	  on older machines.
+	  Select this to enable optimizations for IBM zEnterprise 114 and 196
+	  (2818 and 2817 series). The kernel will be slightly faster but will
+	  not work on older machines.
 
 endchoice
 

arch/s390/include/asm/ipl.h

@@ -167,5 +167,6 @@ enum diag308_rc {
 };
 
 extern int diag308(unsigned long subcode, void *addr);
+extern void diag308_reset(void);
 
 #endif /* _ASM_S390_IPL_H */

arch/s390/include/asm/lowcore.h

@@ -18,6 +18,7 @@ void system_call(void);
 void pgm_check_handler(void);
 void mcck_int_handler(void);
 void io_int_handler(void);
+void psw_restart_int_handler(void);
 
 #ifdef CONFIG_32BIT
 
@@ -150,7 +151,10 @@ struct _lowcore {
 	 */
 	__u32	ipib;				/* 0x0e00 */
 	__u32	ipib_checksum;			/* 0x0e04 */
-	__u8	pad_0x0e08[0x0f00-0x0e08];	/* 0x0e08 */
+
+	/* 64 bit save area */
+	__u64	save_area_64;			/* 0x0e08 */
+	__u8	pad_0x0e10[0x0f00-0x0e10];	/* 0x0e10 */
 
 	/* Extended facility list */
 	__u64	stfle_fac_list[32];		/* 0x0f00 */
@@ -286,7 +290,10 @@ struct _lowcore {
 	 */
 	__u64	ipib;				/* 0x0e00 */
 	__u32	ipib_checksum;			/* 0x0e08 */
-	__u8	pad_0x0e0c[0x0f00-0x0e0c];	/* 0x0e0c */
+
+	/* 64 bit save area */
+	__u64	save_area_64;			/* 0x0e0c */
+	__u8	pad_0x0e14[0x0f00-0x0e14];	/* 0x0e14 */
 
 	/* Extended facility list */
 	__u64	stfle_fac_list[32];		/* 0x0f00 */

arch/s390/include/asm/processor.h

@@ -119,14 +119,12 @@ struct stack_frame {
  * Do necessary setup to start up a new thread.
  */
 #define start_thread(regs, new_psw, new_stackp) do {		\
-	set_fs(USER_DS);					\
 	regs->psw.mask	= psw_user_bits;			\
 	regs->psw.addr	= new_psw | PSW_ADDR_AMODE;		\
 	regs->gprs[15]	= new_stackp;				\
 } while (0)
 
 #define start_thread31(regs, new_psw, new_stackp) do {		\
-	set_fs(USER_DS);					\
 	regs->psw.mask	= psw_user32_bits;			\
 	regs->psw.addr	= new_psw | PSW_ADDR_AMODE;		\
 	regs->gprs[15]	= new_stackp;				\

arch/s390/include/asm/system.h

@@ -113,6 +113,7 @@ extern void pfault_fini(void);
 
 extern void cmma_init(void);
 extern int memcpy_real(void *, void *, size_t);
+extern void copy_to_absolute_zero(void *dest, void *src, size_t count);
 
 #define finish_arch_switch(prev) do {					     \
 	set_fs(current->thread.mm_segment);				     \

arch/s390/kernel/asm-offsets.c

@@ -27,12 +27,9 @@ int main(void)
 	BLANK();
 	DEFINE(__TASK_pid, offsetof(struct task_struct, pid));
 	BLANK();
-	DEFINE(__THREAD_per_cause,
-	       offsetof(struct task_struct, thread.per_event.cause));
-	DEFINE(__THREAD_per_address,
-	       offsetof(struct task_struct, thread.per_event.address));
-	DEFINE(__THREAD_per_paid,
-	       offsetof(struct task_struct, thread.per_event.paid));
+	DEFINE(__THREAD_per_cause, offsetof(struct task_struct, thread.per_event.cause));
+	DEFINE(__THREAD_per_address, offsetof(struct task_struct, thread.per_event.address));
+	DEFINE(__THREAD_per_paid, offsetof(struct task_struct, thread.per_event.paid));
 	BLANK();
 	DEFINE(__TI_task, offsetof(struct thread_info, task));
 	DEFINE(__TI_domain, offsetof(struct thread_info, exec_domain));
@@ -142,6 +139,7 @@ int main(void)
 	DEFINE(__LC_FPREGS_SAVE_AREA, offsetof(struct _lowcore, floating_pt_save_area));
 	DEFINE(__LC_GPREGS_SAVE_AREA, offsetof(struct _lowcore, gpregs_save_area));
 	DEFINE(__LC_CREGS_SAVE_AREA, offsetof(struct _lowcore, cregs_save_area));
+	DEFINE(__LC_SAVE_AREA_64, offsetof(struct _lowcore, save_area_64));
 #ifdef CONFIG_32BIT
 	DEFINE(SAVE_AREA_BASE, offsetof(struct _lowcore, extended_save_area_addr));
 #else /* CONFIG_32BIT */

arch/s390/kernel/base.S

@@ -76,6 +76,42 @@ s390_base_pgm_handler_fn:
 	.quad	0
 	.previous
 
+#
+# Calls diag 308 subcode 1 and continues execution
+#
+# The following conditions must be ensured before calling this function:
+# * Prefix register = 0
+# * Lowcore protection is disabled
+#
+ENTRY(diag308_reset)
+	larl	%r4,.Lctlregs		# Save control registers
+	stctg	%c0,%c15,0(%r4)
+	larl	%r4,.Lrestart_psw	# Setup restart PSW at absolute 0
+	lghi	%r3,0
+	lg	%r4,0(%r4)		# Save PSW
+	sturg	%r4,%r3			# Use sturg, because of large pages
+	lghi	%r1,1
+	diag	%r1,%r1,0x308
+.Lrestart_part2:
+	lhi	%r0,0			# Load r0 with zero
+	lhi	%r1,2			# Use mode 2 = ESAME (dump)
+	sigp	%r1,%r0,0x12		# Switch to ESAME mode
+	sam64				# Switch to 64 bit addressing mode
+	larl	%r4,.Lctlregs		# Restore control registers
+	lctlg	%c0,%c15,0(%r4)
+	br	%r14
+.align 16
+.Lrestart_psw:
+	.long	0x00080000,0x80000000 + .Lrestart_part2
+
+	.section .bss
+.align 8
+.Lctlregs:
+	.rept	16
+	.quad	0
+	.endr
+	.previous
+
 #else /* CONFIG_64BIT */
 
 ENTRY(s390_base_mcck_handler)

arch/s390/kernel/compat_signal.c

@@ -380,20 +380,13 @@ asmlinkage long sys32_sigreturn(void)
 		goto badframe;
 	if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
 		goto badframe;
-
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
+	set_current_blocked(&set);
 	if (restore_sigregs32(regs, &frame->sregs))
 		goto badframe;
 	if (restore_sigregs_gprs_high(regs, frame->gprs_high))
 		goto badframe;
-
 	return regs->gprs[2];
-
 badframe:
 	force_sig(SIGSEGV, current);
 	return 0;
@@ -413,31 +406,22 @@ asmlinkage long sys32_rt_sigreturn(void)
 		goto badframe;
 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
 		goto badframe;
-
 	sigdelsetmask(&set, ~_BLOCKABLE);
-	spin_lock_irq(&current->sighand->siglock);
-	current->blocked = set;
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
-
+	set_current_blocked(&set);
 	if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
 		goto badframe;
 	if (restore_sigregs_gprs_high(regs, frame->gprs_high))
 		goto badframe;
-
 	err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
 	st.ss_sp = compat_ptr(ss_sp);
 	err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
 	err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
 	if (err)
 		goto badframe; 
-
 	set_fs (KERNEL_DS);
 	do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
 	set_fs (old_fs);
-
 	return regs->gprs[2];
-
 badframe:
 	force_sig(SIGSEGV, current);
 	return 0;
@@ -605,26 +589,23 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
  * OK, we're invoking a handler
  */	
 
-int
-handle_signal32(unsigned long sig, struct k_sigaction *ka,
-		siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
+int handle_signal32(unsigned long sig, struct k_sigaction *ka,
+		    siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
 {
+	sigset_t blocked;
 	int ret;
 
 	/* Set up the stack frame */
 	if (ka->sa.sa_flags & SA_SIGINFO)
 		ret = setup_rt_frame32(sig, ka, info, oldset, regs);
 	else
 		ret = setup_frame32(sig, ka, oldset, regs);
-
-	if (ret == 0) {
-		spin_lock_irq(&current->sighand->siglock);
-		sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
-		if (!(ka->sa.sa_flags & SA_NODEFER))
-			sigaddset(&current->blocked,sig);
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
-	}
-	return ret;
+	if (ret)
+		return ret;
+	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
+	if (!(ka->sa.sa_flags & SA_NODEFER))
+		sigaddset(&blocked, sig);
+	set_current_blocked(&blocked);
+	return 0;
 }
 

arch/s390/kernel/entry.S

@@ -849,6 +849,34 @@ restart_crash:
 restart_go:
 #endif
 
+#
+# PSW restart interrupt handler
+#
+ENTRY(psw_restart_int_handler)
+	st	%r15,__LC_SAVE_AREA_64(%r0)	# save r15
+	basr	%r15,0
+0:	l	%r15,.Lrestart_stack-0b(%r15)	# load restart stack
+	l	%r15,0(%r15)
+	ahi	%r15,-SP_SIZE			# make room for pt_regs
+	stm	%r0,%r14,SP_R0(%r15)		# store gprs %r0-%r14 to stack
+	mvc	SP_R15(4,%r15),__LC_SAVE_AREA_64(%r0)# store saved %r15 to stack
+	mvc	SP_PSW(8,%r15),__LC_RST_OLD_PSW(%r0) # store restart old psw
+	xc	__SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # set backchain to 0
+	basr	%r14,0
+1:	l	%r14,.Ldo_restart-1b(%r14)
+	basr	%r14,%r14
+
+	basr	%r14,0				# load disabled wait PSW if
+2:	lpsw	restart_psw_crash-2b(%r14)	# do_restart returns
+	.align 4
+.Ldo_restart:
+	.long	do_restart
+.Lrestart_stack:
+	.long	restart_stack
+	.align 8
+restart_psw_crash:
+	.long	0x000a0000,0x00000000 + restart_psw_crash
+
 	.section .kprobes.text, "ax"
 
 #ifdef CONFIG_CHECK_STACK

arch/s390/kernel/entry64.S

@@ -865,6 +865,26 @@ restart_crash:
 restart_go:
 #endif
 
+#
+# PSW restart interrupt handler
+#
+ENTRY(psw_restart_int_handler)
+	stg	%r15,__LC_SAVE_AREA_64(%r0)	# save r15
+	larl	%r15,restart_stack		# load restart stack
+	lg	%r15,0(%r15)
+	aghi	%r15,-SP_SIZE			# make room for pt_regs
+	stmg	%r0,%r14,SP_R0(%r15)		# store gprs %r0-%r14 to stack
+	mvc	SP_R15(8,%r15),__LC_SAVE_AREA_64(%r0)# store saved %r15 to stack
+	mvc	SP_PSW(16,%r15),__LC_RST_OLD_PSW(%r0)# store restart old psw
+	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # set backchain to 0
+	brasl	%r14,do_restart
+
+	larl	%r14,restart_psw_crash		# load disabled wait PSW if
+	lpswe	0(%r14)				# do_restart returns
+	.align 8
+restart_psw_crash:
+	.quad	0x0002000080000000,0x0000000000000000 + restart_psw_crash
+
 	.section .kprobes.text, "ax"
 
 #ifdef CONFIG_CHECK_STACK