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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

  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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