Messages in this thread Patch in this message | | | Date | Mon, 11 Nov 2019 22:56:48 +0100 | From | Mike Rapoport <> | Subject | Re: [PATCH] RISC-V: Add address map dumper |
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Hi,
On Mon, Nov 11, 2019 at 05:27:25AM +0000, Yash Shah wrote: > 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@sifive.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 I believe this could be enabled when CONFIG_DEBUG_VM=y without adding yet another architecture specific Kconfig option.
> + 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 >
-- Sincerely yours, Mike.
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