[PATCH v2 07/10] riscv: Improve virtual kernel memory layout dump

[Alexandre Ghiti]

With the arrival of sv48 and its large address space, it would be
cumbersome to statically define the unit size to use to print the different
portions of the virtual memory layout: instead, determine it dynamically.

Signed-off-by: Alexandre Ghiti <alexandre.ghiti at canonical.com>
---
 arch/riscv/mm/init.c  | 65 +++++++++++++++++++++++++++++++++----------
 include/linux/sizes.h |  1 +
 2 files changed, 52 insertions(+), 14 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index d7de414c6500..a304f2b3c178 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -90,34 +90,71 @@ static void __init zone_sizes_init(void)
 }
 
 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
+
+#define LOG2_SZ_1K  ilog2(SZ_1K)
+#define LOG2_SZ_1M  ilog2(SZ_1M)
+#define LOG2_SZ_1G  ilog2(SZ_1G)
+#define LOG2_SZ_1T  ilog2(SZ_1T)
+
 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
 {
 	pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld kB)\n", name, b, t,
-		  (((t) - (b)) >> 10));
+		  (((t) - (b)) >> LOG2_SZ_1K));
 }
 
 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
 {
 	pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld MB)\n", name, b, t,
-		  (((t) - (b)) >> 20));
+		  (((t) - (b)) >> LOG2_SZ_1M));
+}
+
+static inline void print_mlg(char *name, unsigned long b, unsigned long t)
+{
+	pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld GB)\n", name, b, t,
+		  (((t) - (b)) >> LOG2_SZ_1G));
+}
+
+#ifdef CONFIG_64BIT
+static inline void print_mlt(char *name, unsigned long b, unsigned long t)
+{
+	pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld TB)\n", name, b, t,
+		  (((t) - (b)) >> LOG2_SZ_1T));
+}
+#endif
+
+static inline void print_ml(char *name, unsigned long b, unsigned long t)
+{
+	unsigned long diff = t - b;
+
+#ifdef CONFIG_64BIT
+	if ((diff >> LOG2_SZ_1T) >= 10)
+		print_mlt(name, b, t);
+	else
+#endif
+	if ((diff >> LOG2_SZ_1G) >= 10)
+		print_mlg(name, b, t);
+	else if ((diff >> LOG2_SZ_1M) >= 10)
+		print_mlm(name, b, t);
+	else
+		print_mlk(name, b, t);
 }
 
 static void __init print_vm_layout(void)
 {
 	pr_notice("Virtual kernel memory layout:\n");
-	print_mlk("fixmap", (unsigned long)FIXADDR_START,
-		  (unsigned long)FIXADDR_TOP);
-	print_mlm("pci io", (unsigned long)PCI_IO_START,
-		  (unsigned long)PCI_IO_END);
-	print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
-		  (unsigned long)VMEMMAP_END);
-	print_mlm("vmalloc", (unsigned long)VMALLOC_START,
-		  (unsigned long)VMALLOC_END);
-	print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
-		  (unsigned long)high_memory);
+	print_ml("fixmap", (unsigned long)FIXADDR_START,
+		 (unsigned long)FIXADDR_TOP);
+	print_ml("pci io", (unsigned long)PCI_IO_START,
+		 (unsigned long)PCI_IO_END);
+	print_ml("vmemmap", (unsigned long)VMEMMAP_START,
+		 (unsigned long)VMEMMAP_END);
+	print_ml("vmalloc", (unsigned long)VMALLOC_START,
+		 (unsigned long)VMALLOC_END);
+	print_ml("lowmem", (unsigned long)PAGE_OFFSET,
+		 (unsigned long)high_memory);
 #ifdef CONFIG_64BIT
-	print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
-		  (unsigned long)ADDRESS_SPACE_END);
+	print_ml("kernel", (unsigned long)KERNEL_LINK_ADDR,
+		 (unsigned long)ADDRESS_SPACE_END);
 #endif
 }
 #else
diff --git a/include/linux/sizes.h b/include/linux/sizes.h
index 1ac79bcee2bb..0bc6cf394b08 100644
--- a/include/linux/sizes.h
+++ b/include/linux/sizes.h
@@ -47,6 +47,7 @@
 #define SZ_8G				_AC(0x200000000, ULL)
 #define SZ_16G				_AC(0x400000000, ULL)
 #define SZ_32G				_AC(0x800000000, ULL)
+#define SZ_1T				_AC(0x10000000000, ULL)
 #define SZ_64T				_AC(0x400000000000, ULL)
 
 #endif /* __LINUX_SIZES_H__ */
-- 
2.30.2