From: Logan Gunthorpe <logang@deltatee.com>
To: Greentime Hu <green.hu@gmail.com>
Cc: greentime.hu@sifive.com, paul.walmsley@sifive.com,
Rob Herring <robh@kernel.org>, Albert Ou <aou@eecs.berkeley.edu>,
Andrew Waterman <andrew@sifive.com>,
Palmer Dabbelt <palmer@sifive.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Stephen Bates <sbates@raithlin.com>, Zong Li <zong@andestech.com>,
Olof Johansson <olof@lixom.net>,
linux-riscv@lists.infradead.org,
Michael Clark <michaeljclark@mac.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v4 2/2] RISC-V: Implement sparsemem
Date: Fri, 9 Aug 2019 13:03:30 -0600 [thread overview]
Message-ID: <e2603558-7b2c-2e5f-e28c-f01782dc4e66@deltatee.com> (raw)
In-Reply-To: <CAEbi=3ebNM-t_vA4OA7KCvQUF08o6VmL1j=kMojVnYsYsN_fBw@mail.gmail.com>
On 2019-08-09 11:01 a.m., Greentime Hu wrote:
> Hi Logan,
>
> Logan Gunthorpe <logang@deltatee.com> 於 2019年8月9日 週五 下午11:47寫道:
>>
>>
>>
>> On 2019-08-08 10:23 p.m., Greentime Hu wrote:
>>> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
>>> index 3f12b069af1d..208b3e14ccd8 100644
>>> --- a/arch/riscv/Kconfig
>>> +++ b/arch/riscv/Kconfig
>>> @@ -116,7 +116,8 @@ config PGTABLE_LEVELS
>>> default 2
>>>
>>> config HAVE_ARCH_PFN_VALID
>>> - def_bool y
>>> + bool
>>> + default !SPARSEMEM_VMEMMAP
>>>
>>> menu "Platform type"
>>>
>>> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
>>> index 8ddb6c7fedac..6991f7a5a4a7 100644
>>> --- a/arch/riscv/include/asm/page.h
>>> +++ b/arch/riscv/include/asm/page.h
>>> @@ -93,16 +93,20 @@ extern unsigned long min_low_pfn;
>>> #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
>>> #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
>>>
>>> +#if !defined(CONFIG_SPARSEMEM_VMEMMAP)
>>> +#define pfn_valid(pfn) \
>>> + (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
>>> #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
>>> #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
>>> +#else
>>> +#define virt_to_page(vaddr) ((struct page *)((((u64)vaddr -
>>> va_pa_offset) / PAGE_SIZE) * sizeof(struct page) + VMEMMAP_START))
>>> +#define page_to_virt(pg) ((void *)(((((u64)pg - VMEMMAP_START) /
>>> sizeof(struct page)) * PAGE_SIZE) + va_pa_offset))
>>> +#endif
>>
>> This doesn't make sense to me at all. It should always use pfn_to_page()
>> for virt_to_page() and the generic pfn_to_page()/page_to_pfn()
>> implementations essentially already do what you are doing in a cleaner
>> way. So I'd be really surprised if this does anything at all.
>>
>
> Thank you for point me out that. I just checked the generic
> implementation and I should use that one.
> Sorry I didn't check the generic one and just implement it again.
> I think the only patch we need is the first part to use generic
> pfn_valid(). I just tested it and yes it can boot successfully in dts
> with hole.
>
> It will fail in this check ((pfn)-pfn_base) < max_mapnr.
Sounds to me like max_mapnr is not set correctly. See the code in
setup_bootmem(). Seems like 'mem_size' should be set to the largest
memory block, not just the one that contains the kernel...
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 3f12b069af1d..208b3e14ccd8 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -116,7 +116,8 @@ config PGTABLE_LEVELS
> default 2
>
> config HAVE_ARCH_PFN_VALID
> - def_bool y
> + bool
> + default !SPARSEMEM_VMEMMAP
>
> menu "Platform type"
>
> diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
> index 8ddb6c7fedac..80d28fa1e2eb 100644
> --- a/arch/riscv/include/asm/page.h
> +++ b/arch/riscv/include/asm/page.h
> @@ -100,8 +100,10 @@ extern unsigned long min_low_pfn;
> #define page_to_bus(page) (page_to_phys(page))
> #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
>
> +#if !defined(CONFIG_SPARSEMEM_VMEMMAP)
> #define pfn_valid(pfn) \
> (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
> +#endif
>
> #define ARCH_PFN_OFFSET (pfn_base)
This patch still makes no sense. I'm not sure why we have an arch
specific pfn_valid() because it's very similar to the generic one. But
my guess is there's a reason for it and it's not doing what it is
supposed when you remove it for the sparsemem case.
Logan
next prev parent reply other threads:[~2019-08-09 19:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-09 20:39 [PATCH v4 0/2] [PATCH v2 0/6] sparsemem support for RISC-V Logan Gunthorpe
2019-01-09 20:39 ` [PATCH v4 1/2] sh: mm: make use of new memblocks_present() helper Logan Gunthorpe
2019-01-15 13:58 ` Christoph Hellwig
2019-01-15 17:30 ` Logan Gunthorpe
2019-01-09 20:39 ` [PATCH v4 2/2] RISC-V: Implement sparsemem Logan Gunthorpe
2019-01-15 13:58 ` Christoph Hellwig
2019-07-31 6:30 ` Greentime Hu
2019-07-31 17:07 ` Logan Gunthorpe
2019-08-01 3:34 ` Greentime Hu
[not found] ` <CAEbi=3eZcgWevpX9VO9ohgxVDFVprk_t52Xbs3-TdtZ+js3NVA@mail.gmail.com>
2019-08-09 15:46 ` Logan Gunthorpe
2019-08-09 17:01 ` Greentime Hu
2019-08-09 19:03 ` Logan Gunthorpe [this message]
2019-08-12 4:01 ` Greentime Hu
2019-08-12 15:51 ` Logan Gunthorpe
2019-08-13 6:04 ` Greentime Hu
2019-08-13 16:14 ` Logan Gunthorpe
2019-08-13 16:39 ` Paul Walmsley
2019-08-13 16:48 ` Paul Walmsley
2019-08-13 16:49 ` Logan Gunthorpe
2019-08-14 13:35 ` Greentime Hu
2019-08-14 16:56 ` Logan Gunthorpe
2019-08-14 17:40 ` Paul Walmsley
2019-08-14 17:46 ` Logan Gunthorpe
2019-08-14 20:09 ` Paul Walmsley
2019-08-14 22:21 ` Logan Gunthorpe
2019-08-15 9:31 ` Greentime Hu
2019-08-15 16:20 ` Logan Gunthorpe
2019-08-16 2:07 ` Greentime Hu
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