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

[Xianting Tian]

在 2022/5/16 下午5:03, Conor.Dooley at microchip.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 at a0000000 {
>>>                   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 at alibaba-inc.com>
>>> Reviewed-by: Guo Ren <guoren at kernel.org>
>>> Reviewed-by: Nick Kossifidis <mick at ics.forth.gr>
>>> Signed-off-by: Xianting Tian <xianting.tian at linux.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;
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