aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/asm-offsets.c7
-rw-r--r--arch/s390/kernel/sclp.S5
-rw-r--r--arch/s390/kernel/smp.c36
-rw-r--r--arch/s390/kernel/swsusp_asm64.S91
4 files changed, 70 insertions, 69 deletions
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index fa9905ce7d0b..63e46433e81d 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -7,6 +7,7 @@
#include <linux/sched.h>
#include <linux/kbuild.h>
#include <asm/vdso.h>
+#include <asm/sigp.h>
int main(void)
{
@@ -59,6 +60,10 @@ int main(void)
DEFINE(CLOCK_REALTIME, CLOCK_REALTIME);
DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC);
DEFINE(CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC);
-
+ /* constants for SIGP */
+ DEFINE(__SIGP_STOP, sigp_stop);
+ DEFINE(__SIGP_RESTART, sigp_restart);
+ DEFINE(__SIGP_SENSE, sigp_sense);
+ DEFINE(__SIGP_INITIAL_CPU_RESET, sigp_initial_cpu_reset);
return 0;
}
diff --git a/arch/s390/kernel/sclp.S b/arch/s390/kernel/sclp.S
index 20639dfe0c42..e27ca63076d1 100644
--- a/arch/s390/kernel/sclp.S
+++ b/arch/s390/kernel/sclp.S
@@ -24,8 +24,6 @@ LC_EXT_INT_CODE = 0x86 # addr of ext int code
# R3 = external interruption parameter if R2=0
#
-.section ".init.text","ax"
-
_sclp_wait_int:
stm %r6,%r15,24(%r15) # save registers
basr %r13,0 # get base register
@@ -318,9 +316,8 @@ _sclp_print_early:
.long _sclp_work_area
.Lascebc:
.long _ascebc
-.previous
-.section ".init.data","a"
+.section .data,"aw",@progbits
.balign 4096
_sclp_work_area:
.fill 4096
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 6f14734abe72..b4b6396e6cf0 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1041,42 +1041,6 @@ out:
static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show,
dispatching_store);
-/*
- * If the resume kernel runs on another cpu than the suspended kernel,
- * we have to switch the cpu IDs in the logical map.
- */
-void smp_switch_boot_cpu_in_resume(u32 resume_phys_cpu_id,
- struct _lowcore *suspend_lowcore)
-{
- int cpu, suspend_cpu_id, resume_cpu_id;
- u32 suspend_phys_cpu_id;
-
- suspend_phys_cpu_id = __cpu_logical_map[suspend_lowcore->cpu_nr];
- suspend_cpu_id = suspend_lowcore->cpu_nr;
-
- for_each_present_cpu(cpu) {
- if (__cpu_logical_map[cpu] == resume_phys_cpu_id) {
- resume_cpu_id = cpu;
- goto found;
- }
- }
- panic("Could not find resume cpu in logical map.\n");
-
-found:
- printk("Resume cpu ID: %i/%i\n", resume_phys_cpu_id, resume_cpu_id);
- printk("Suspend cpu ID: %i/%i\n", suspend_phys_cpu_id, suspend_cpu_id);
-
- __cpu_logical_map[resume_cpu_id] = suspend_phys_cpu_id;
- __cpu_logical_map[suspend_cpu_id] = resume_phys_cpu_id;
-
- lowcore_ptr[suspend_cpu_id]->cpu_addr = resume_phys_cpu_id;
-}
-
-u32 smp_get_phys_cpu_id(void)
-{
- return __cpu_logical_map[smp_processor_id()];
-}
-
static int __init topology_init(void)
{
int cpu;
diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S
index fc056810a017..fe927d0bc20b 100644
--- a/arch/s390/kernel/swsusp_asm64.S
+++ b/arch/s390/kernel/swsusp_asm64.S
@@ -9,6 +9,7 @@
#include <asm/page.h>
#include <asm/ptrace.h>
+#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
/*
@@ -41,6 +42,9 @@ swsusp_arch_suspend:
/* Get pointer to save area */
lghi %r1,0x1000
+ /* Save CPU address */
+ stap __LC_CPU_ADDRESS(%r1)
+
/* Store registers */
mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */
stfpc 0x31c(%r1) /* store fpu control */
@@ -105,12 +109,7 @@ swsusp_arch_resume:
/* Make all free pages stable */
lghi %r2,1
brasl %r14,arch_set_page_states
-#ifdef CONFIG_SMP
- /* Save boot cpu number */
- brasl %r14,smp_get_phys_cpu_id
- larl %r1,saved_cpu_id
- st %r2,0(%r1)
-#endif
+
/* Deactivate DAT */
stnsm __SF_EMPTY(%r15),0xfb
@@ -139,12 +138,10 @@ swsusp_arch_resume:
/* Reset System */
larl %r1,restart_entry
- larl %r2,restart_psw
+ larl %r2,.Lrestart_diag308_psw
og %r1,0(%r2)
stg %r1,0(%r0)
- larl %r1,saved_pgm_check_psw
- mvc 0(16,%r1),__LC_PGM_NEW_PSW(%r0)
- larl %r1,new_pgm_check_psw
+ larl %r1,.Lnew_pgm_check_psw
epsw %r2,%r3
stm %r2,%r3,0(%r1)
mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1)
@@ -154,12 +151,54 @@ restart_entry:
lhi %r1,1
sigp %r1,%r0,0x12
sam64
- larl %r1,new_pgm_check_psw
+ larl %r1,.Lnew_pgm_check_psw
lpswe 0(%r1)
pgm_check_entry:
- larl %r1,saved_pgm_check_psw
- mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1)
+ /* Switch to original suspend CPU */
+ larl %r1,.Lresume_cpu /* Resume CPU address: r2 */
+ stap 0(%r1)
+ llgh %r2,0(%r1)
+ lghi %r3,0x1000
+ llgh %r1,__LC_CPU_ADDRESS(%r3) /* Suspend CPU address: r1 */
+ cgr %r1,%r2
+ je restore_registers /* r1 = r2 -> nothing to do */
+ larl %r4,.Lrestart_suspend_psw /* Set new restart PSW */
+ mvc __LC_RESTART_PSW(16,%r0),0(%r4)
+3:
+ sigp %r9,%r1,__SIGP_INITIAL_CPU_RESET
+ brc 8,4f /* accepted */
+ brc 2,3b /* busy, try again */
+
+ /* Suspend CPU not available -> panic */
+ larl %r15,init_thread_union
+ ahi %r15,1<<(PAGE_SHIFT+THREAD_ORDER)
+ larl %r2,.Lpanic_string
+ larl %r3,_sclp_print_early
+ lghi %r1,0
+ sam31
+ sigp %r1,%r0,0x12
+ basr %r14,%r3
+ larl %r3,.Ldisabled_wait_31
+ lpsw 0(%r3)
+4:
+ /* Switch to suspend CPU */
+ sigp %r9,%r1,__SIGP_RESTART /* start suspend CPU */
+ brc 2,4b /* busy, try again */
+5:
+ sigp %r9,%r2,__SIGP_STOP /* stop resume (current) CPU */
+6: j 6b
+
+restart_suspend:
+ larl %r1,.Lresume_cpu
+ llgh %r2,0(%r1)
+7:
+ sigp %r9,%r2,__SIGP_SENSE /* Wait for resume CPU */
+ brc 2,7b /* busy, try again */
+ tmll %r9,0x40 /* Test if resume CPU is stopped */
+ jz 7b
+
+restore_registers:
/* Restore registers */
lghi %r13,0x1000 /* %r1 = pointer to save arae */
@@ -193,13 +232,6 @@ pgm_check_entry:
/* Pointer to save area */
lghi %r13,0x1000
-#ifdef CONFIG_SMP
- /* Switch CPUs */
- larl %r1,saved_cpu_id
- llgf %r2,0(%r1)
- llgf %r3,0x318(%r13)
- brasl %r14,smp_switch_boot_cpu_in_resume
-#endif
/* Restore prefix register */
spx 0x318(%r13)
@@ -217,13 +249,16 @@ pgm_check_entry:
.section .data.nosave,"aw",@progbits
.align 8
-restart_psw:
+.Ldisabled_wait_31:
+ .long 0x000a0000,0x00000000
+.Lpanic_string:
+ .asciz "Resume not possible because suspend CPU is no longer available"
+ .align 8
+.Lrestart_diag308_psw:
.long 0x00080000,0x80000000
-new_pgm_check_psw:
+.Lrestart_suspend_psw:
+ .quad 0x0000000180000000,restart_suspend
+.Lnew_pgm_check_psw:
.quad 0,pgm_check_entry
-saved_pgm_check_psw:
- .quad 0,0
-#ifdef CONFIG_SMP
-saved_cpu_id:
- .long 0
-#endif
+.Lresume_cpu:
+ .byte 0,0
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 06:04:32 +0000