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Date: Mon, 11 Nov 2019 05:27:25 +0000
From: Yash Shah <yash.shah@...ive.com>
To: "Paul Walmsley ( Sifive)" <paul.walmsley@...ive.com>,
"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "palmer@...belt.com" <palmer@...belt.com>,
"aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
"Anup.Patel@....com" <Anup.Patel@....com>,
"rppt@...ux.ibm.com" <rppt@...ux.ibm.com>,
"logang@...tatee.com" <logang@...tatee.com>,
"ren_guo@...ky.com" <ren_guo@...ky.com>,
"bmeng.cn@...il.com" <bmeng.cn@...il.com>,
"tglx@...utronix.de" <tglx@...utronix.de>,
Sachin Ghadi <sachin.ghadi@...ive.com>,
Yash Shah <yash.shah@...ive.com>
Subject: [PATCH] RISC-V: Add address map dumper
Add support for dumping the kernel address space layout to the console.
User can enable CONFIG_DEBUG_VM_LAYOUT to dump the virtual memory region
into dmesg buffer during boot-up.
Signed-off-by: Yash Shah <yash.shah@...ive.com>
---
This patch is based on Linux 5.4-rc6 and tested on SiFive HiFive Unleashed
board.
---
arch/riscv/Kconfig.debug | 9 +++++++++
arch/riscv/mm/init.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/arch/riscv/Kconfig.debug b/arch/riscv/Kconfig.debug
index e69de29..cdedfd3 100644
--- a/arch/riscv/Kconfig.debug
+++ b/arch/riscv/Kconfig.debug
@@ -0,0 +1,9 @@
+config DEBUG_VM_LAYOUT
+ bool "Print virtual memory layout on boot up"
+ depends on DEBUG_KERNEL
+ help
+ Say Y here if you want to dump the kernel virtual memory layout to
+ dmesg log on boot up. This information is only useful for kernel
+ developers who are working in architecture specific areas of the
+ kernel. It is probably not a good idea to enable this feature in a
+ production kernel.
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 79cfb35..fcb8144 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -55,6 +55,36 @@ void __init mem_init(void)
memblock_free_all();
mem_init_print_info(NULL);
+#ifdef CONFIG_DEBUG_VM_LAYOUT
+#define MLK(b, t) b, t, (((t) - (b)) >> 10)
+#define MLM(b, t) b, t, (((t) - (b)) >> 20)
+#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
+
+
+ pr_notice("Virtual kernel memory layout:\n"
+ " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
+ " vmemmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
+ " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
+ " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
+ " .init : 0x%px - 0x%px (%4td kB)\n"
+ " .text : 0x%px - 0x%px (%4td kB)\n"
+ " .data : 0x%px - 0x%px (%4td kB)\n"
+ " .bss : 0x%px - 0x%px (%4td kB)\n",
+
+ MLK(FIXADDR_START, FIXADDR_TOP),
+ MLM(VMEMMAP_START, VMEMMAP_END),
+ MLM(VMALLOC_START, VMALLOC_END),
+ MLM(PAGE_OFFSET, (unsigned long)high_memory),
+
+ MLK_ROUNDUP(__init_begin, __init_end),
+ MLK_ROUNDUP(_text, _etext),
+ MLK_ROUNDUP(_sdata, _edata),
+ MLK_ROUNDUP(__bss_start, __bss_stop));
+
+#undef MLK
+#undef MLM
+#undef MLK_ROUNDUP
+#endif
}
#ifdef CONFIG_BLK_DEV_INITRD
--
2.7.4
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