linux-kernel - Re: [PATCH v2] RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem instead of IORESOURCE_BUSY

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Message-ID: <910efc8b-5d6f-820e-3b89-97c668e78cd8@linux.alibaba.com>
Date:   Mon, 16 May 2022 17:10:40 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     Conor.Dooley@...rochip.com, mick@....forth.gr,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, anup@...infault.org,
        akpm@...ux-foundation.org, wangkefeng.wang@...wei.com,
        rppt@...nel.org, david@...hat.com, wangborong@...rlc.com,
        twd2.me@...il.com, seanjc@...gle.com, alex@...ti.fr,
        petr.pavlu@...e.com, atishp@...osinc.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jianghuaming.jhm@...baba-inc.com, guoren@...nel.org,
        stable@...nel.org
Subject: Re: [PATCH v2] RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem
 instead of IORESOURCE_BUSY

在 2022/5/16 下午5:03, Conor.Dooley@...rochip.com 写道:
> On 16/05/2022 09:50, Xianting Tian wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> Hi
>>
>> Could I get any comments for the v2 patch, thanks
> Looks like you have 3 Reviewed-bys already & there's only been one full
> working day since you sent the patch, probably just worth waiting a little
> for Palmer to get around to picking it up :)
> Thanks,
> Conor.

thanks :)

I just saw Heiko Stuebner gaved Review-by on patchwork.kernel.org, but I 
didn't received the mail.

Let's wait Palmer to pick up.

>> 在 2022/5/12 下午2:09, Xianting Tian 写道:
>>> Commit 00ab027a3b82 ("RISC-V: Add kernel image sections to the resource tree")
>>> marked IORESOURCE_BUSY for reserved memory, which casued resource map
>>> failed in subsequent operations of related driver, so remove the
>>> IORESOURCE_BUSY flag. In order to prohibit userland mapping reserved
>>> memory, mark IORESOURCE_EXCLUSIVE for it.
>>>
>>> The code to reproduce the issue,
>>> dts:
>>>           mem0: memory@...00000 {
>>>                   reg = <0x0 0xa0000000 0 0x1000000>;
>>>                   no-map;
>>>           };
>>>
>>>           &test {
>>>                   status = "okay";
>>>                   memory-region = <&mem0>;
>>>           };
>>>
>>> code:
>>>           np = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
>>>           ret = of_address_to_resource(np, 0, &r);
>>>           base = devm_ioremap_resource(&pdev->dev, &r);
>>>           // base = -EBUSY
>>>
>>> Fixes: 00ab027a3b82 ("RISC-V: Add kernel image sections to the resource tree")
>>> Reported-by: Huaming Jiang <jianghuaming.jhm@...baba-inc.com>
>>> Reviewed-by: Guo Ren <guoren@...nel.org>
>>> Reviewed-by: Nick Kossifidis <mick@....forth.gr>
>>> Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com>
>>> ---
>>>    arch/riscv/kernel/setup.c | 4 ++--
>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
>>> index 834eb652a7b9..e0a00739bd13 100644
>>> --- a/arch/riscv/kernel/setup.c
>>> +++ b/arch/riscv/kernel/setup.c
>>> @@ -189,7 +189,7 @@ static void __init init_resources(void)
>>>                res = &mem_res[res_idx--];
>>>
>>>                res->name = "Reserved";
>>> -             res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
>>> +             res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
>>>                res->start = __pfn_to_phys(memblock_region_reserved_base_pfn(region));
>>>                res->end = __pfn_to_phys(memblock_region_reserved_end_pfn(region)) - 1;
>>>
>>> @@ -214,7 +214,7 @@ static void __init init_resources(void)
>>>
>>>                if (unlikely(memblock_is_nomap(region))) {
>>>                        res->name = "Reserved";
>>> -                     res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
>>> +                     res->flags = IORESOURCE_MEM | IORESOURCE_EXCLUSIVE;
>>>                } else {
>>>                        res->name = "System RAM";
>>>                        res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
>> _______________________________________________
>> linux-riscv mailing list
>> linux-riscv@...ts.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-riscv

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