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Message-ID: <2e62621a-1fb8-5de7-8d0e-e6c4019931a1@microchip.com>
Date: Mon, 16 May 2022 09:03:26 +0000
From: <Conor.Dooley@...rochip.com>
To: <xianting.tian@...ux.alibaba.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
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@...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;
>
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