powerpc/ptdump: Display size of BATs

Display the size of areas mapped with BATs.

For that, the size display for pages is refactorised.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/acf764eee231f0358e66ca9e819f052804055acc.1589866984.git.christophe.leroy@csgroup.eu

arch/powerpc/mm/ptdump/bats.c

@@ -10,6 +10,8 @@
 #include <asm/pgtable.h>
 #include <asm/cpu_has_feature.h>
 
+#include "ptdump.h"
+
 static char *pp_601(int k, int pp)
 {
 	if (pp == 0)
@@ -42,6 +44,7 @@ static void bat_show_601(struct seq_file *m, int idx, u32 lower, u32 upper)
 #else
 	seq_printf(m, "0x%08x ", pbn);
 #endif
+	pt_dump_size(m, size);
 
 	seq_printf(m, "Kernel %s User %s", pp_601(k & 2, pp), pp_601(k & 1, pp));
 
@@ -88,6 +91,7 @@ static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool
 #else
 	seq_printf(m, "0x%08x ", brpn);
 #endif
+	pt_dump_size(m, size);
 
 	if (k == 1)
 		seq_puts(m, "User ");

arch/powerpc/mm/ptdump/ptdump.c

@@ -112,6 +112,19 @@ static struct addr_marker address_markers[] = {
 		seq_putc(m, c);		\
 })
 
+void pt_dump_size(struct seq_file *m, unsigned long size)
+{
+	static const char units[] = "KMGTPE";
+	const char *unit = units;
+
+	/* Work out what appropriate unit to use */
+	while (!(size & 1023) && unit[1]) {
+		size >>= 10;
+		unit++;
+	}
+	pt_dump_seq_printf(m, "%9lu%c ", size, *unit);
+}
+
 static void dump_flag_info(struct pg_state *st, const struct flag_info
 		*flag, u64 pte, int num)
 {
@@ -146,8 +159,6 @@ static void dump_flag_info(struct pg_state *st, const struct flag_info
 
 static void dump_addr(struct pg_state *st, unsigned long addr)
 {
-	static const char units[] = "KMGTPE";
-	const char *unit = units;
 	unsigned long delta;
 
 #ifdef CONFIG_PPC64
@@ -164,13 +175,7 @@ static void dump_addr(struct pg_state *st, unsigned long addr)
 		pt_dump_seq_printf(st->seq, " " REG " ", st->start_pa);
 		delta = (addr - st->start_address) >> 10;
 	}
-	/* Work out what appropriate unit to use */
-	while (!(delta & 1023) && unit[1]) {
-		delta >>= 10;
-		unit++;
-	}
-	pt_dump_seq_printf(st->seq, "%9lu%c", delta, *unit);
-
+	pt_dump_size(st->seq, delta);
 }
 
 static void note_prot_wx(struct pg_state *st, unsigned long addr)

arch/powerpc/mm/ptdump/ptdump.h

 /* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/types.h>
+#include <linux/seq_file.h>
 
 struct flag_info {
 	u64		mask;
@@ -17,3 +18,5 @@ struct pgtable_level {
 };
 
 extern struct pgtable_level pg_level[5];
+
+void pt_dump_size(struct seq_file *m, unsigned long delta);