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

From: <Conor.Dooley@microchip.com>
To: <xianting.tian@linux.alibaba.com>, <mick@ics.forth.gr>,
	<paul.walmsley@sifive.com>, <palmer@dabbelt.com>,
	<aou@eecs.berkeley.edu>, <anup@brainfault.org>,
	<akpm@linux-foundation.org>, <wangkefeng.wang@huawei.com>,
	<rppt@kernel.org>, <david@redhat.com>, <wangborong@cdjrlc.com>,
	<twd2.me@gmail.com>, <seanjc@google.com>, <alex@ghiti.fr>,
	<petr.pavlu@suse.com>, <atishp@rivosinc.com>
Cc: <linux-riscv@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
	<jianghuaming.jhm@alibaba-inc.com>, <guoren@kernel.org>,
	<stable@kernel.org>
Subject: Re: [PATCH v2] RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem instead of IORESOURCE_BUSY
Date: Mon, 16 May 2022 09:03:26 +0000	[thread overview]
Message-ID: <2e62621a-1fb8-5de7-8d0e-e6c4019931a1@microchip.com> (raw)
In-Reply-To: <e32a2228-2e2f-0da2-87e8-e364c0450dcd@linux.alibaba.com>

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.

> 
> 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@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@alibaba-inc.com>
>> Reviewed-by: Guo Ren <guoren@kernel.org>
>> Reviewed-by: Nick Kossifidis <mick@ics.forth.gr>
>> Signed-off-by: Xianting Tian <xianting.tian@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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