From: Yash Shah <yash.shah@sifive.com>
To: "Paul Walmsley ( Sifive)" <paul.walmsley@sifive.com>,
"linux-riscv@lists.infradead.org"
<linux-riscv@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "palmer@dabbelt.com" <palmer@dabbelt.com>,
"aou@eecs.berkeley.edu" <aou@eecs.berkeley.edu>,
"Anup.Patel@wdc.com" <Anup.Patel@wdc.com>,
"rppt@linux.ibm.com" <rppt@linux.ibm.com>,
"logang@deltatee.com" <logang@deltatee.com>,
"ren_guo@c-sky.com" <ren_guo@c-sky.com>,
"bmeng.cn@gmail.com" <bmeng.cn@gmail.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"wangkefeng.wang@huawei.com" <wangkefeng.wang@huawei.com>,
Sachin Ghadi <sachin.ghadi@sifive.com>,
Yash Shah <yash.shah@sifive.com>
Subject: [PATCH v2] RISC-V: Add address map dumper
Date: Mon, 18 Nov 2019 05:58:34 +0000 [thread overview]
Message-ID: <1574056694-28927-1-git-send-email-yash.shah@sifive.com> (raw)
Add support for dumping the kernel address space layout to the console.
User can enable CONFIG_DEBUG_VM to dump the virtual memory region into
dmesg buffer during boot-up.
Signed-off-by: Yash Shah <yash.shah@sifive.com>
---
This patch is based on Linux 5.4-rc6 and tested on SiFive HiFive
Unleashed board.
Changes in v2:
- Avoid #ifdefs inside functions
- Helper functions instead of macros
- Drop newly added CONFIG_DEBUG_VM_LAYOUT, instead use CONFIG_DEBUG_VM
---
arch/riscv/mm/init.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 573463d..7828136 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -45,6 +45,41 @@ void setup_zero_page(void)
memset((void *)empty_zero_page, 0, PAGE_SIZE);
}
+#ifdef CONFIG_DEBUG_VM
+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));
+}
+
+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));
+}
+
+static void print_vm_layout(void)
+{
+ pr_notice("Virtual kernel memory layout:\n");
+ print_mlk("fixmap", (unsigned long)FIXADDR_START,
+ (unsigned long)FIXADDR_TOP);
+ 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_mlk(".init", (unsigned long)__init_begin,
+ (unsigned long)__init_end);
+ print_mlk(".text", (unsigned long)_text, (unsigned long)_etext);
+ print_mlk(".data", (unsigned long)_sdata, (unsigned long)_edata);
+ print_mlk(".bss", (unsigned long)__bss_start,
+ (unsigned long)__bss_stop);
+}
+#else
+static void print_vm_layout(void) { }
+#endif /* CONFIG_DEBUG_VM */
+
void __init mem_init(void)
{
#ifdef CONFIG_FLATMEM
@@ -55,6 +90,7 @@ void __init mem_init(void)
memblock_free_all();
mem_init_print_info(NULL);
+ print_vm_layout();
}
#ifdef CONFIG_BLK_DEV_INITRD
--
2.7.4
next reply other threads:[~2019-11-18 5:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-18 5:58 Yash Shah [this message]
2019-11-18 6:12 ` [PATCH v2] RISC-V: Add address map dumper Anup Patel
2019-11-18 16:44 ` Logan Gunthorpe
2019-11-23 2:57 ` Paul Walmsley
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