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s390: Remove zfcpdump NR_CPUS dependency

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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>
This commit is contained in:
Michael Holzheu 2013-10-11 10:29:23 +02:00 committed by Martin Schwidefsky
parent 05e0baaf9b
commit 5895294274
5 changed files with 49 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/s390/include/asm/ipl.h
View File

@ -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 ipl_flags;
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);

1
arch/s390/include/asm/smp.h
View File

@ -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);

34
arch/s390/kernel/crash_dump.c
View File

@ -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 @@ static int get_cpu_cnt(void)
{
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 @@ static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset)
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);

11
arch/s390/kernel/smp.c
View File

@ -533,9 +533,6 @@ EXPORT_SYMBOL(smp_ctl_clear_bit);
#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 @@ static void __init smp_get_save_area(int cpu, u16 address)
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. */

20
drivers/s390/char/zcore.c
View File

@ -151,7 +151,7 @@ static int __init init_cpu_info(enum arch_id arch)
/* 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 @@ static int __init init_cpu_info(enum arch_id arch)
kfree(sa);
return -EIO;
}
zfcpdump_save_areas[0] = sa;
return 0;
}
@ -246,24 +245,25 @@ static int copy_lc(void __user *buf, void *sa, int sa_off, int len)
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 @@ static int zcore_add_lc(char __user *buf, unsigned long start, size_t count)
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 @@ static void __init zcore_header_init(int arch, struct zcore_header *hdr,
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;