[PATCH 7/8] pseries: phyp dump: Tracking memory range freed.

[Manish Ahuja <ahuja@austin.ibm.com>]

This patch 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>
-----

---
 arch/powerpc/platforms/pseries/phyp_dump.c |   35 +++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

Index: 2.6.25-rc1/arch/powerpc/platforms/pseries/phyp_dump.c
===================================================================
--- 2.6.25-rc1.orig/arch/powerpc/platforms/pseries/phyp_dump.c	2008-02-28 23:36:47.000000000 -0600
+++ 2.6.25-rc1/arch/powerpc/platforms/pseries/phyp_dump.c	2008-02-28 23:36:49.000000000 -0600
@@ -262,6 +262,39 @@ void release_memory_range(unsigned long 
 	}
 }
 
+/**
+ * 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.
@@ -286,6 +319,8 @@ static ssize_t store_release_region(stru
 	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)