[POWERPC] pseries: phyp dump: Tracking memory range freed

This tracks the size freed.  For now it does a simple rudimentary
calculation of the ranges freed.  The idea is to keep it simple at the
external shell script level and send in large chunks for now.

Signed-off-by: Manish Ahuja <mahuja@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/phyp_dump.c b/arch/powerpc/platforms/pseries/phyp_dump.c
index df4870ec90d8..034fe1b54dd9 100644
--- a/arch/powerpc/platforms/pseries/phyp_dump.c
+++ b/arch/powerpc/platforms/pseries/phyp_dump.c
@@ -261,6 +261,39 @@ static void release_memory_range(unsigned long start_pfn,
         }
 }
 
+/**
+ * track_freed_range -- Counts the range being freed.
+ * Once the counter goes to zero, it re-registers dump for
+ * future use.
+ */
+static void
+track_freed_range(unsigned long addr, unsigned long length)
+{
+        static unsigned long scratch_area_size, reserved_area_size;
+
+        if (addr < phyp_dump_info->init_reserve_start)
+                return;
+
+        if ((addr >= phyp_dump_info->init_reserve_start) &&
+            (addr <= phyp_dump_info->init_reserve_start +
+             phyp_dump_info->init_reserve_size))
+                reserved_area_size += length;
+
+        if ((addr >= phyp_dump_info->reserved_scratch_addr) &&
+            (addr <= phyp_dump_info->reserved_scratch_addr +
+             phyp_dump_info->reserved_scratch_size))
+                scratch_area_size += length;
+
+        if ((reserved_area_size == phyp_dump_info->init_reserve_size) &&
+            (scratch_area_size == phyp_dump_info->reserved_scratch_size)) {
+
+                invalidate_last_dump(&phdr,
+                                phyp_dump_info->reserved_scratch_addr);
+                register_dump_area(&phdr,
+                                phyp_dump_info->reserved_scratch_addr);
+        }
+}
+
 /* ------------------------------------------------- */
 /**
  * sysfs_release_region -- sysfs interface to release memory range.
@@ -285,6 +318,8 @@ static ssize_t store_release_region(struct kobject *kobj,
         if (ret != 2)
                 return -EINVAL;
 
+        track_freed_range(start_addr, length);
+
         /* Range-check - don't free any reserved memory that
          * wasn't reserved for phyp-dump */
         if (start_addr < phyp_dump_info->init_reserve_start)