On Tuesday 20 February 2018 07:48 PM, Hari Bathini wrote:
Add support to parse the new 'ibm,dynamic-memory-v2' property in the
'ibm,dynamic-reconfiguration-memory' node. This replaces the old
'ibm,dynamic-memory' property and is enabled in the kernel with a
patch series that starts with commit 0c38ed6f6f0b ("powerpc/pseries:
Enable support of ibm,dynamic-memory-v2"). All LMBs that share the same
flags and are adjacent are grouped together in the newer version of the
property making it compact to represent larger memory configurations.
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
---
kexec/arch/ppc64/crashdump-ppc64.c | 23 +++++++--
kexec/arch/ppc64/crashdump-ppc64.h | 16 +++++-
kexec/arch/ppc64/kexec-ppc64.c | 35 ++++++++++----
kexec/fs2dt.c | 92 ++++++++++++++++++++++--------------
4 files changed, 112 insertions(+), 54 deletions(-)
diff --git a/kexec/arch/ppc64/crashdump-ppc64.c b/kexec/arch/ppc64/crashdump-ppc64.c
index bc9f948..50e3853 100644
--- a/kexec/arch/ppc64/crashdump-ppc64.c
+++ b/kexec/arch/ppc64/crashdump-ppc64.c
@@ -39,6 +39,10 @@
#define DEVTREE_CRASHKERNEL_BASE "/proc/device-tree/chosen/linux,crashkernel-base"
#define DEVTREE_CRASHKERNEL_SIZE "/proc/device-tree/chosen/linux,crashkernel-size"
+unsigned int num_of_lmb_sets;
+unsigned int is_dyn_mem_v2;
+uint64_t lmb_size;
+
static struct crash_elf_info elf_info64 =
{
class: ELFCLASS64,
@@ -127,6 +131,7 @@ static int get_dyn_reconf_crash_memory_ranges(void)
{
uint64_t start, end;
uint64_t startrange, endrange;
+ uint64_t size;
char fname[128], buf[32];
FILE *file;
unsigned int i;
@@ -135,6 +140,8 @@ static int get_dyn_reconf_crash_memory_ranges(void)
strcpy(fname, "/proc/device-tree/");
strcat(fname, "ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory");
+ if (is_dyn_mem_v2)
+ strcat(fname, "-v2");
if ((file = fopen(fname, "r")) == NULL) {
perror(fname);
return -1;
@@ -142,8 +149,9 @@ static int get_dyn_reconf_crash_memory_ranges(void)
fseek(file, 4, SEEK_SET);
startrange = endrange = 0;
- for (i = 0; i < num_of_lmbs; i++) {
- if ((n = fread(buf, 1, 24, file)) < 0) {
+ size = lmb_size;
+ for (i = 0; i < num_of_lmb_sets; i++) {
+ if ((n = fread(buf, 1, LMB_ENTRY_SIZE, file)) < 0) {
perror(fname);
fclose(file);
return -1;
@@ -156,8 +164,15 @@ static int get_dyn_reconf_crash_memory_ranges(void)
return -1;
}
- start = be64_to_cpu(((uint64_t *)buf)[DRCONF_ADDR]);
- end = start + lmb_size;
+ /*
+ * If the property is ibm,dynamic-memory-v2, the first 4 bytes
+ * tell the number of sequential LMBs in this entry.
+ */
+ if (is_dyn_mem_v2)
+ size = be32_to_cpu(((unsigned int *)buf)[0]) * lmb_size;
+
+ start = be64_to_cpu(*((uint64_t *)&buf[DRCONF_ADDR]));
+ end = start + size;
if (start == 0 && end >= (BACKUP_SRC_END + 1))
start = BACKUP_SRC_END + 1;
diff --git a/kexec/arch/ppc64/crashdump-ppc64.h b/kexec/arch/ppc64/crashdump-ppc64.h
index 42ccc31..87beb39 100644
--- a/kexec/arch/ppc64/crashdump-ppc64.h
+++ b/kexec/arch/ppc64/crashdump-ppc64.h
@@ -34,10 +34,18 @@ extern unsigned int rtas_size;
extern uint64_t opal_base;
extern uint64_t opal_size;
-uint64_t lmb_size;
-unsigned int num_of_lmbs;
This might probably break compilation on other architectures like arm64
& mips.
Will check and post v2..
- Hari
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