From: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
OPAL based system exports reserved memory ranges through /proc/device-tree
for the regions that are reserved by OPAL firmware. Traverse
/proc/device-tree/reserved-ranges and add them to exclude_ranges[] and
reserve them.
Signed-off-by: Mahesh Salgaonkar <mahesh at linux.vnet.ibm.com>
---
kexec/arch/ppc64/kexec-ppc64.c | 44 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/kexec/arch/ppc64/kexec-ppc64.c b/kexec/arch/ppc64/kexec-ppc64.c
index 5956836..6e79f52 100644
--- a/kexec/arch/ppc64/kexec-ppc64.c
+++ b/kexec/arch/ppc64/kexec-ppc64.c
@@ -31,6 +31,7 @@
#include "../../kexec.h"
#include "../../kexec-syscall.h"
#include "kexec-ppc64.h"
+#include "../../fs2dt.h"
#include "crashdump-ppc64.h"
#include <arch/options.h>
@@ -314,6 +315,47 @@ static int sort_ranges(void)
return 0;
}
+void scan_reserved_ranges(unsigned long kexec_flags, int *range_index)
+{
+ char fname[256], buf[16];
+ FILE *file;
+ int i = *range_index;
+
+ strcpy(fname, "/proc/device-tree/reserved-ranges");
+
+ file = fopen(fname, "r");
+ if (file == NULL) {
+ if (errno != ENOENT) {
+ perror(fname);
+ return;
+ }
+ errno = 0;
+ /* File not present. Non PowerKVM system. */
+ return;
+ }
+
+ /*
+ * Each reserved range is an (address,size) pair, 2 cells each,
+ * totalling 4 cells per range.
+ */
+ while (fread(buf, sizeof(uint64_t) * 2, 1, file) == 1) {
+ uint64_t base, size;
+
+ base = be64_to_cpu(((uint64_t *)buf)[0]);
+ size = be64_to_cpu(((uint64_t *)buf)[1]);
+
+ exclude_range[i].start = base;
+ exclude_range[i].end = base + size;
+ i++;
+ if (i >= max_memory_ranges)
+ realloc_memory_ranges();
+
+ reserve(base, size);
+ }
+ fclose(file);
+ *range_index = i;
+}
+
/* Get devtree details and create exclude_range array
* Also create usablemem_ranges for KEXEC_ON_CRASH
*/
@@ -339,6 +381,8 @@ static int get_devtree_details(unsigned long kexec_flags)
return -1;
}
+ scan_reserved_ranges(kexec_flags, &i);
+
while ((dentry = readdir(dir)) != NULL) {
if (strncmp(dentry->d_name, "chosen", 6) &&
strncmp(dentry->d_name, "memory@", 7) &&
