Vivek found specical handling crashkernel low in not good.
We should extend kexec-tools to handle multiple Crash kernel instead.
Extend crash_reserved_mem to array instead and use
kexec_iomem_for_each_line directly. After that we can drop
crashkernel low.
Suggested-by: Vivek Goyal <vgoyal at redhat.com>
Signed-off-by: Yinghai Lu <yinghai at kernel.org>
---
kexec/arch/i386/crashdump-x86.c | 91 ++++++++++++++++++----------------------
1 file changed, 43 insertions(+), 48 deletions(-)
Index: kexec-tools/kexec/arch/i386/crashdump-x86.c
===================================================================
--- kexec-tools.orig/kexec/arch/i386/crashdump-x86.c
+++ kexec-tools/kexec/arch/i386/crashdump-x86.c
@@ -188,9 +188,9 @@ static int exclude_region(int *nr_ranges
static struct memory_range crash_memory_range[CRASH_MAX_MEMORY_RANGES];
/* Memory region reserved for storing panic kernel and other data. */
-static struct memory_range crash_reserved_mem;
-/* under 4G parts */
-static struct memory_range crash_reserved_low_mem;
+#define CRASH_RESERVED_MEM_NR 8
+static struct memory_range crash_reserved_mem[CRASH_RESERVED_MEM_NR];
+static int crash_reserved_mem_nr;
/* Reads the appropriate file and retrieves the SYSTEM RAM regions for whom to
* create Elf headers. Keeping it separate from get_memory_ranges() as
@@ -207,7 +207,7 @@ static int get_crash_memory_ranges(struc
int kexec_flags, unsigned long lowmem_limit)
{
const char *iomem = proc_iomem();
- int memory_ranges = 0, gart = 0;
+ int memory_ranges = 0, gart = 0, i;
char line[MAX_LINE];
FILE *fp;
unsigned long long start, end;
@@ -268,29 +268,28 @@ static int get_crash_memory_ranges(struc
}
fclose(fp);
if (kexec_flags & KEXEC_PRESERVE_CONTEXT) {
- int i;
for (i = 0; i < memory_ranges; i++) {
if (crash_memory_range[i].end > 0x0009ffff) {
- crash_reserved_mem.start = \
+ crash_reserved_mem[0].start = \
crash_memory_range[i].start;
break;
}
}
- if (crash_reserved_mem.start >= mem_max) {
+ if (crash_reserved_mem[0].start >= mem_max) {
fprintf(stderr, "Too small mem_max: 0x%llx.\n",
mem_max);
return -1;
}
- crash_reserved_mem.end = mem_max;
- crash_reserved_mem.type = RANGE_RAM;
+ crash_reserved_mem[0].end = mem_max;
+ crash_reserved_mem[0].type = RANGE_RAM;
+ crash_reserved_mem_nr = 1;
}
- if (exclude_region(&memory_ranges, crash_reserved_mem.start,
- crash_reserved_mem.end) < 0)
- return -1;
- if (crash_reserved_low_mem.start &&
- exclude_region(&memory_ranges, crash_reserved_low_mem.start,
- crash_reserved_low_mem.end) < 0)
- return -1;
+
+ for (i = 0; i < crash_reserved_mem_nr; i++)
+ if (exclude_region(&memory_ranges, crash_reserved_mem[i].start,
+ crash_reserved_mem[i].end) < 0)
+ return -1;
+
if (gart) {
/* exclude GART region if the system has one */
if (exclude_region(&memory_ranges, gart_start, gart_end) < 0)
@@ -351,9 +350,10 @@ static int get_crash_memory_ranges_xen(s
qsort(*range, *ranges, sizeof(struct memory_range), compare_ranges);
- if (exclude_region(ranges, crash_reserved_mem.start,
- crash_reserved_mem.end) < 0)
- goto err;
+ for (i = 0; i < crash_reserved_mem_nr; i++)
+ if (exclude_region(ranges, crash_reserved_mem[i].start,
+ crash_reserved_mem[i].end) < 0)
+ goto err;
ret = 0;
@@ -434,9 +434,10 @@ static int get_crash_memory_ranges_xen(s
qsort(*range, *ranges, sizeof(struct memory_range), compare_ranges);
- if (exclude_region(ranges, crash_reserved_mem.start,
- crash_reserved_mem.end) < 0)
- goto err;
+ for (i = 0; i < crash_reserved_mem_nr; i++)
+ if (exclude_region(ranges, crash_reserved_mem[i].start,
+ crash_reserved_mem[i].end) < 0)
+ goto err;
ret = 0;
@@ -1022,15 +1023,10 @@ int load_crashdump_segments(struct kexec
memmap_p = xmalloc(sz);
memset(memmap_p, 0, sz);
add_memmap(memmap_p, info->backup_src_start, info->backup_src_size);
- sz = crash_reserved_mem.end - crash_reserved_mem.start +1;
- if (add_memmap(memmap_p, crash_reserved_mem.start, sz) < 0) {
- return ENOCRASHKERNEL;
- }
-
- if (crash_reserved_low_mem.start) {
- sz = crash_reserved_low_mem.end - crash_reserved_low_mem.start
- +1;
- add_memmap(memmap_p, crash_reserved_low_mem.start, sz);
+ for (i = 0; i < crash_reserved_mem_nr; i++) {
+ sz = crash_reserved_mem[i].end - crash_reserved_mem[i].start +1;
+ if (add_memmap(memmap_p, crash_reserved_mem[i].start, sz) < 0)
+ return ENOCRASHKERNEL;
}
/* Create a backup region segment to store backup data*/
@@ -1101,25 +1097,24 @@ int load_crashdump_segments(struct kexec
return 0;
}
-int is_crashkernel_mem_reserved(void)
+static int crashkernel_mem_callback(void *UNUSED(data), int nr,
+ char *UNUSED(str),
+ unsigned long base,
+ unsigned long length)
{
- uint64_t start, end;
-
- if (parse_iomem_single("Crash kernel\n", &start, &end) || start == end)
- return 0;
-
- crash_reserved_mem.start = start;
- crash_reserved_mem.end = end;
- crash_reserved_mem.type = RANGE_RAM;
-
- /* If there is no Crash low kernel, still can go on */
- if (parse_iomem_single("Crash kernel low\n", &start, &end) ||
- start == end)
+ if (nr >= CRASH_RESERVED_MEM_NR)
return 1;
- crash_reserved_low_mem.start = start;
- crash_reserved_low_mem.end = end;
- crash_reserved_low_mem.type = RANGE_RAM;
+ crash_reserved_mem[nr].start = base;
+ crash_reserved_mem[nr].end = base + length - 1;
+ crash_reserved_mem[nr].type = RANGE_RAM;
+ return 0;
+}
+
+int is_crashkernel_mem_reserved(void)
+{
+ crash_reserved_mem_nr = kexec_iomem_for_each_line("Crash kernel\n",
+ crashkernel_mem_callback, NULL);
- return 1;
+ return !!crash_reserved_mem_nr;
}
