s390: Remove zfcpdump NR_CPUS dependency
Currently zfpcdump can only collect registers for up to CONFIG_NR_CPUS
CPUss. This dependency is not necessary. So remove it by dynamically
allocating the save area array.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h
index 2bd6cb89..ea7d9d6 100644
--- a/arch/s390/include/asm/ipl.h
+++ b/arch/s390/include/asm/ipl.h
@@ -7,6 +7,7 @@
#ifndef _ASM_S390_IPL_H
#define _ASM_S390_IPL_H
+#include <asm/lowcore.h>
#include <asm/types.h>
#include <asm/cio.h>
#include <asm/setup.h>
@@ -88,6 +89,14 @@
extern u32 dump_prefix_page;
extern unsigned int zfcpdump_prefix_array[];
+struct dump_save_areas {
+ struct save_area **areas;
+ int count;
+};
+
+extern struct dump_save_areas dump_save_areas;
+struct save_area *dump_save_area_create(int cpu);
+
extern void do_reipl(void);
extern void do_halt(void);
extern void do_poff(void);
diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h
index b64f15c..ac9bed8 100644
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -14,7 +14,6 @@
#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
extern struct mutex smp_cpu_state_mutex;
-extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
extern int __cpu_up(unsigned int cpu, struct task_struct *tidle);
diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index 3db6af0..f45b2ab 100644
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -22,6 +22,32 @@
#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
+struct dump_save_areas dump_save_areas;
+
+/*
+ * Allocate and add a save area for a CPU
+ */
+struct save_area *dump_save_area_create(int cpu)
+{
+ struct save_area **save_areas, *save_area;
+
+ save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
+ if (!save_area)
+ return NULL;
+ if (cpu + 1 > dump_save_areas.count) {
+ dump_save_areas.count = cpu + 1;
+ save_areas = krealloc(dump_save_areas.areas,
+ dump_save_areas.count * sizeof(void *),
+ GFP_KERNEL | __GFP_ZERO);
+ if (!save_areas) {
+ kfree(save_area);
+ return NULL;
+ }
+ dump_save_areas.areas = save_areas;
+ }
+ dump_save_areas.areas[cpu] = save_area;
+ return save_area;
+}
/*
* Return physical address for virtual address
@@ -450,8 +476,8 @@
{
int i, cpus = 0;
- for (i = 0; zfcpdump_save_areas[i]; i++) {
- if (zfcpdump_save_areas[i]->pref_reg == 0)
+ for (i = 0; i < dump_save_areas.count; i++) {
+ if (dump_save_areas.areas[i]->pref_reg == 0)
continue;
cpus++;
}
@@ -522,8 +548,8 @@
ptr = nt_prpsinfo(ptr);
- for (i = 0; zfcpdump_save_areas[i]; i++) {
- sa = zfcpdump_save_areas[i];
+ for (i = 0; i < dump_save_areas.count; i++) {
+ sa = dump_save_areas.areas[i];
if (sa->pref_reg == 0)
continue;
ptr = fill_cpu_elf_notes(ptr, sa);
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index cca6cf6..739313d 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -533,9 +533,6 @@
#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP)
-struct save_area *zfcpdump_save_areas[NR_CPUS + 1];
-EXPORT_SYMBOL_GPL(zfcpdump_save_areas);
-
static void __init smp_get_save_area(int cpu, u16 address)
{
void *lc = pcpu_devices[0].lowcore;
@@ -546,15 +543,9 @@
if (!OLDMEM_BASE && (address == boot_cpu_address ||
ipl_info.type != IPL_TYPE_FCP_DUMP))
return;
- if (cpu >= NR_CPUS) {
- pr_warning("CPU %i exceeds the maximum %i and is excluded "
- "from the dump\n", cpu, NR_CPUS - 1);
- return;
- }
- save_area = kmalloc(sizeof(struct save_area), GFP_KERNEL);
+ save_area = dump_save_area_create(cpu);
if (!save_area)
panic("could not allocate memory for save area\n");
- zfcpdump_save_areas[cpu] = save_area;
#ifdef CONFIG_CRASH_DUMP
if (address == boot_cpu_address) {
/* Copy the registers of the boot cpu. */
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 794820a..ffb1fcf 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -151,7 +151,7 @@
/* get info for boot cpu from lowcore, stored in the HSA */
- sa = kmalloc(sizeof(*sa), GFP_KERNEL);
+ sa = dump_save_area_create(0);
if (!sa)
return -ENOMEM;
if (memcpy_hsa_kernel(sa, sys_info.sa_base, sys_info.sa_size) < 0) {
@@ -159,7 +159,6 @@
kfree(sa);
return -EIO;
}
- zfcpdump_save_areas[0] = sa;
return 0;
}
@@ -246,24 +245,25 @@
static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
{
unsigned long end;
- int i = 0;
+ int i;
if (count == 0)
return 0;
end = start + count;
- while (zfcpdump_save_areas[i]) {
+ for (i = 0; i < dump_save_areas.count; i++) {
unsigned long cp_start, cp_end; /* copy range */
unsigned long sa_start, sa_end; /* save area range */
unsigned long prefix;
unsigned long sa_off, len, buf_off;
+ struct save_area *save_area = dump_save_areas.areas[i];
- prefix = zfcpdump_save_areas[i]->pref_reg;
+ prefix = save_area->pref_reg;
sa_start = prefix + sys_info.sa_base;
sa_end = prefix + sys_info.sa_base + sys_info.sa_size;
if ((end < sa_start) || (start > sa_end))
- goto next;
+ continue;
cp_start = max(start, sa_start);
cp_end = min(end, sa_end);
@@ -272,10 +272,8 @@
len = cp_end - cp_start;
TRACE("copy_lc for: %lx\n", start);
- if (copy_lc(buf + buf_off, zfcpdump_save_areas[i], sa_off, len))
+ if (copy_lc(buf + buf_off, save_area, sa_off, len))
return -EFAULT;
-next:
- i++;
}
return 0;
}
@@ -637,8 +635,8 @@
hdr->num_pages = mem_size / PAGE_SIZE;
hdr->tod = get_tod_clock();
get_cpu_id(&hdr->cpu_id);
- for (i = 0; zfcpdump_save_areas[i]; i++) {
- prefix = zfcpdump_save_areas[i]->pref_reg;
+ for (i = 0; i < dump_save_areas.count; i++) {
+ prefix = dump_save_areas.areas[i]->pref_reg;
hdr->real_cpu_cnt++;
if (!prefix)
continue;