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Diffstat (limited to 'arch/s390/kernel/smp.c')
-rw-r--r--arch/s390/kernel/smp.c50
1 files changed, 19 insertions, 31 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 4df56fdb2488..81f12bb77f62 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -18,6 +18,7 @@
#define KMSG_COMPONENT "cpu"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+#include <linux/cpufeature.h>
#include <linux/workqueue.h>
#include <linux/memblock.h>
#include <linux/export.h>
@@ -38,6 +39,7 @@
#include <linux/kprobes.h>
#include <asm/access-regs.h>
#include <asm/asm-offsets.h>
+#include <asm/machine.h>
#include <asm/ctlreg.h>
#include <asm/pfault.h>
#include <asm/diag.h>
@@ -97,13 +99,6 @@ __vector128 __initdata boot_cpu_vector_save_area[__NUM_VXRS];
static unsigned int smp_max_threads __initdata = -1U;
cpumask_t cpu_setup_mask;
-static int __init early_nosmt(char *s)
-{
- smp_max_threads = 1;
- return 0;
-}
-early_param("nosmt", early_nosmt);
-
static int __init early_smt(char *s)
{
get_option(&s, &smp_max_threads);
@@ -263,13 +258,12 @@ static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
lc->percpu_offset = __per_cpu_offset[cpu];
lc->kernel_asce = get_lowcore()->kernel_asce;
lc->user_asce = s390_invalid_asce;
- lc->machine_flags = get_lowcore()->machine_flags;
lc->user_timer = lc->system_timer =
lc->steal_timer = lc->avg_steal_timer = 0;
abs_lc = get_abs_lowcore();
memcpy(lc->cregs_save_area, abs_lc->cregs_save_area, sizeof(lc->cregs_save_area));
put_abs_lowcore(abs_lc);
- lc->cregs_save_area[1] = lc->kernel_asce;
+ lc->cregs_save_area[1] = lc->user_asce;
lc->cregs_save_area[7] = lc->user_asce;
save_access_regs((unsigned int *) lc->access_regs_save_area);
arch_spin_lock_setup(cpu);
@@ -416,7 +410,7 @@ EXPORT_SYMBOL(arch_vcpu_is_preempted);
void notrace smp_yield_cpu(int cpu)
{
- if (!MACHINE_HAS_DIAG9C)
+ if (!machine_has_diag9c())
return;
diag_stat_inc_norecursion(DIAG_STAT_X09C);
asm volatile("diag %0,0,0x9c"
@@ -561,10 +555,10 @@ int smp_store_status(int cpu)
if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_STATUS_AT_ADDRESS,
pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
return -EIO;
- if (!cpu_has_vx() && !MACHINE_HAS_GS)
+ if (!cpu_has_vx() && !cpu_has_gs())
return 0;
pa = lc->mcesad & MCESA_ORIGIN_MASK;
- if (MACHINE_HAS_GS)
+ if (cpu_has_gs())
pa |= lc->mcesad & MCESA_LC_MASK;
if (__pcpu_sigp_relax(pcpu->address, SIGP_STORE_ADDITIONAL_STATUS,
pa) != SIGP_CC_ORDER_CODE_ACCEPTED)
@@ -574,7 +568,7 @@ int smp_store_status(int cpu)
/*
* Collect CPU state of the previous, crashed system.
- * There are four cases:
+ * There are three cases:
* 1) standard zfcp/nvme dump
* condition: OLDMEM_BASE == NULL && is_ipl_type_dump() == true
* The state for all CPUs except the boot CPU needs to be collected
@@ -587,16 +581,16 @@ int smp_store_status(int cpu)
* with sigp stop-and-store-status. The firmware or the boot-loader
* stored the registers of the boot CPU in the absolute lowcore in the
* memory of the old system.
- * 3) kdump and the old kernel did not store the CPU state,
- * or stand-alone kdump for DASD
- * condition: OLDMEM_BASE != NULL && !is_kdump_kernel()
+ * 3) kdump or stand-alone kdump for DASD
+ * condition: OLDMEM_BASE != NULL && is_ipl_type_dump() == false
* The state for all CPUs except the boot CPU needs to be collected
* with sigp stop-and-store-status. The kexec code or the boot-loader
* stored the registers of the boot CPU in the memory of the old system.
- * 4) kdump and the old kernel stored the CPU state
- * condition: OLDMEM_BASE != NULL && is_kdump_kernel()
- * This case does not exist for s390 anymore, setup_arch explicitly
- * deactivates the elfcorehdr= kernel parameter
+ *
+ * Note that the legacy kdump mode where the old kernel stored the CPU states
+ * does no longer exist: setup_arch() explicitly deactivates the elfcorehdr=
+ * kernel parameter. The is_kdump_kernel() implementation on s390 is independent
+ * of the elfcorehdr= parameter.
*/
static bool dump_available(void)
{
@@ -611,9 +605,7 @@ void __init smp_save_dump_ipl_cpu(void)
if (!dump_available())
return;
sa = save_area_alloc(true);
- regs = memblock_alloc(512, 8);
- if (!sa || !regs)
- panic("could not allocate memory for boot CPU save area\n");
+ regs = memblock_alloc_or_panic(512, 8);
copy_oldmem_kernel(regs, __LC_FPREGS_SAVE_AREA, 512);
save_area_add_regs(sa, regs);
memblock_free(regs, 512);
@@ -646,8 +638,6 @@ void __init smp_save_dump_secondary_cpus(void)
SIGP_CC_NOT_OPERATIONAL)
continue;
sa = save_area_alloc(false);
- if (!sa)
- panic("could not allocate memory for save area\n");
__pcpu_sigp_relax(addr, SIGP_STORE_STATUS_AT_ADDRESS, __pa(page));
save_area_add_regs(sa, page);
if (cpu_has_vx()) {
@@ -792,10 +782,7 @@ void __init smp_detect_cpus(void)
u16 address;
/* Get CPU information */
- info = memblock_alloc(sizeof(*info), 8);
- if (!info)
- panic("%s: Failed to allocate %zu bytes align=0x%x\n",
- __func__, sizeof(*info), 8);
+ info = memblock_alloc_or_panic(sizeof(*info), 8);
smp_get_core_info(info, 1);
/* Find boot CPU type */
if (sclp.has_core_type) {
@@ -814,6 +801,7 @@ void __init smp_detect_cpus(void)
mtid = boot_core_type ? sclp.mtid : sclp.mtid_cp;
mtid = (mtid < smp_max_threads) ? mtid : smp_max_threads - 1;
pcpu_set_smt(mtid);
+ cpu_smt_set_num_threads(smp_cpu_mtid + 1, smp_cpu_mtid + 1);
/* Print number of CPUs */
c_cpus = s_cpus = 0;
@@ -1011,7 +999,7 @@ static ssize_t cpu_configure_show(struct device *dev,
ssize_t count;
mutex_lock(&smp_cpu_state_mutex);
- count = sprintf(buf, "%d\n", per_cpu(pcpu_devices, dev->id).state);
+ count = sysfs_emit(buf, "%d\n", per_cpu(pcpu_devices, dev->id).state);
mutex_unlock(&smp_cpu_state_mutex);
return count;
}
@@ -1083,7 +1071,7 @@ static DEVICE_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store);
static ssize_t show_cpu_address(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", per_cpu(pcpu_devices, dev->id).address);
+ return sysfs_emit(buf, "%d\n", per_cpu(pcpu_devices, dev->id).address);
}
static DEVICE_ATTR(address, 0444, show_cpu_address, NULL);
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-27 01:25:54 +0300