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Diffstat (limited to 'arch/s390/kernel/smp.c')
-rw-r--r--arch/s390/kernel/smp.c108
1 files changed, 62 insertions, 46 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 76a6fdd46c45..8b10127c00ad 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -36,6 +36,7 @@
#include <linux/cpu.h>
#include <linux/timex.h>
#include <linux/bootmem.h>
+#include <asm/asm-offsets.h>
#include <asm/ipl.h>
#include <asm/setup.h>
#include <asm/sigp.h>
@@ -53,7 +54,7 @@
#include "entry.h"
/* logical cpu to cpu address */
-int __cpu_logical_map[NR_CPUS];
+unsigned short __cpu_logical_map[NR_CPUS];
static struct task_struct *current_set[NR_CPUS];
@@ -72,13 +73,13 @@ static int cpu_management;
static DEFINE_PER_CPU(struct cpu, cpu_devices);
-static void smp_ext_bitcall(int, ec_bit_sig);
+static void smp_ext_bitcall(int, int);
-static int cpu_stopped(int cpu)
+static int raw_cpu_stopped(int cpu)
{
- __u32 status;
+ u32 status;
- switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) {
+ switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) {
case sigp_status_stored:
/* Check for stopped and check stop state */
if (status & 0x50)
@@ -90,6 +91,44 @@ static int cpu_stopped(int cpu)
return 0;
}
+static inline int cpu_stopped(int cpu)
+{
+ return raw_cpu_stopped(cpu_logical_map(cpu));
+}
+
+void smp_switch_to_ipl_cpu(void (*func)(void *), void *data)
+{
+ struct _lowcore *lc, *current_lc;
+ struct stack_frame *sf;
+ struct pt_regs *regs;
+ unsigned long sp;
+
+ if (smp_processor_id() == 0)
+ func(data);
+ __load_psw_mask(PSW_BASE_BITS | PSW_DEFAULT_KEY);
+ /* Disable lowcore protection */
+ __ctl_clear_bit(0, 28);
+ current_lc = lowcore_ptr[smp_processor_id()];
+ lc = lowcore_ptr[0];
+ if (!lc)
+ lc = current_lc;
+ lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+ lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu;
+ if (!cpu_online(0))
+ smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]);
+ while (sigp(0, sigp_stop_and_store_status) == sigp_busy)
+ cpu_relax();
+ sp = lc->panic_stack;
+ sp -= sizeof(struct pt_regs);
+ regs = (struct pt_regs *) sp;
+ memcpy(&regs->gprs, &current_lc->gpregs_save_area, sizeof(regs->gprs));
+ regs->psw = lc->psw_save_area;
+ sp -= STACK_FRAME_OVERHEAD;
+ sf = (struct stack_frame *) sp;
+ sf->back_chain = regs->gprs[15];
+ smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]);
+}
+
void smp_send_stop(void)
{
int cpu, rc;
@@ -103,7 +142,7 @@ void smp_send_stop(void)
if (cpu == smp_processor_id())
continue;
do {
- rc = signal_processor(cpu, sigp_stop);
+ rc = sigp(cpu, sigp_stop);
} while (rc == sigp_busy);
while (!cpu_stopped(cpu))
@@ -139,13 +178,13 @@ static void do_ext_call_interrupt(__u16 code)
* Send an external call sigp to another cpu and return without waiting
* for its completion.
*/
-static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
+static void smp_ext_bitcall(int cpu, int sig)
{
/*
* Set signaling bit in lowcore of target cpu and kick it
*/
set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast);
- while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy)
+ while (sigp(cpu, sigp_emergency_signal) == sigp_busy)
udelay(10);
}
@@ -239,24 +278,8 @@ void smp_ctl_clear_bit(int cr, int bit)
}
EXPORT_SYMBOL(smp_ctl_clear_bit);
-/*
- * In early ipl state a temp. logically cpu number is needed, so the sigp
- * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on
- * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1.
- */
-#define CPU_INIT_NO 1
-
#ifdef CONFIG_ZFCPDUMP
-/*
- * zfcpdump_prefix_array holds prefix registers for the following scenario:
- * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to
- * save its prefix registers, since they get lost, when switching from 31 bit
- * to 64 bit.
- */
-unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \
- __attribute__((__section__(".data")));
-
static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
{
if (ipl_info.type != IPL_TYPE_FCP_DUMP)
@@ -266,21 +289,15 @@ static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
"the dump\n", cpu, NR_CPUS - 1);
return;
}
- zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL);
- __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu;
- while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) ==
- sigp_busy)
+ zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL);
+ while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy)
cpu_relax();
memcpy(zfcpdump_save_areas[cpu],
(void *)(unsigned long) store_prefix() + SAVE_AREA_BASE,
- SAVE_AREA_SIZE);
-#ifdef CONFIG_64BIT
- /* copy original prefix register */
- zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu];
-#endif
+ sizeof(struct save_area));
}
-union save_area *zfcpdump_save_areas[NR_CPUS + 1];
+struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
#else
@@ -389,8 +406,7 @@ static void __init smp_detect_cpus(void)
for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) {
if (cpu == boot_cpu_addr)
continue;
- __cpu_logical_map[CPU_INIT_NO] = cpu;
- if (!cpu_stopped(CPU_INIT_NO))
+ if (!raw_cpu_stopped(cpu))
continue;
smp_get_save_area(c_cpus, cpu);
c_cpus++;
@@ -413,8 +429,7 @@ static void __init smp_detect_cpus(void)
cpu_addr = info->cpu[cpu].address;
if (cpu_addr == boot_cpu_addr)
continue;
- __cpu_logical_map[CPU_INIT_NO] = cpu_addr;
- if (!cpu_stopped(CPU_INIT_NO)) {
+ if (!raw_cpu_stopped(cpu_addr)) {
s_cpus++;
continue;
}
@@ -533,18 +548,18 @@ static void smp_free_lowcore(int cpu)
/* Upping and downing of CPUs */
int __cpuinit __cpu_up(unsigned int cpu)
{
- struct task_struct *idle;
struct _lowcore *cpu_lowcore;
+ struct task_struct *idle;
struct stack_frame *sf;
- sigp_ccode ccode;
u32 lowcore;
+ int ccode;
if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED)
return -EIO;
if (smp_alloc_lowcore(cpu))
return -ENOMEM;
do {
- ccode = signal_processor(cpu, sigp_initial_cpu_reset);
+ ccode = sigp(cpu, sigp_initial_cpu_reset);
if (ccode == sigp_busy)
udelay(10);
if (ccode == sigp_not_operational)
@@ -552,7 +567,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
} while (ccode == sigp_busy);
lowcore = (u32)(unsigned long)lowcore_ptr[cpu];
- while (signal_processor_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)
+ while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy)
udelay(10);
idle = current_set[cpu];
@@ -578,7 +593,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func;
eieio();
- while (signal_processor(cpu, sigp_restart) == sigp_busy)
+ while (sigp(cpu, sigp_restart) == sigp_busy)
udelay(10);
while (!cpu_online(cpu))
@@ -640,7 +655,7 @@ void __cpu_die(unsigned int cpu)
/* Wait until target cpu is down */
while (!cpu_stopped(cpu))
cpu_relax();
- while (signal_processor_p(0, cpu, sigp_set_prefix) == sigp_busy)
+ while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy)
udelay(10);
smp_free_lowcore(cpu);
pr_info("Processor %d stopped\n", cpu);
@@ -649,7 +664,7 @@ void __cpu_die(unsigned int cpu)
void cpu_die(void)
{
idle_task_exit();
- while (signal_processor(smp_processor_id(), sigp_stop) == sigp_busy)
+ while (sigp(smp_processor_id(), sigp_stop) == sigp_busy)
cpu_relax();
for (;;);
}
@@ -765,7 +780,8 @@ static ssize_t cpu_configure_store(struct sys_device *dev,
get_online_cpus();
mutex_lock(&smp_cpu_state_mutex);
rc = -EBUSY;
- if (cpu_online(cpu))
+ /* disallow configuration changes of online cpus and cpu 0 */
+ if (cpu_online(cpu) || cpu == 0)
goto out;
rc = 0;
switch (val) {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 07:17:51 +0100