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| author | Xianting Tian <xianting.tian@linux.alibaba.com> | 2022-05-18 09:34:28 +0800 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-06-01 22:03:50 -0700 |
| commit | e61bf5c071148c80d091f8e7220b3b9130780ae3 (patch) | |
| tree | e3150277564b122e05cbac91e352b246626a3ca4 /arch | |
| parent | 02d88b40cb2e9614e0117c3385afdce878f0d377 (diff) | |
| download | linux-e61bf5c071148c80d091f8e7220b3b9130780ae3.tar.bz2 | |
RISC-V: Mark IORESOURCE_EXCLUSIVE for reserved mem instead of IORESOURCE_BUSY
Commit 00ab027a3b82 ("RISC-V: Add kernel image sections to the resource tree")
marked IORESOURCE_BUSY for reserved memory, which caused 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: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Co-developed-by: Nick Kossifidis <mick@ics.forth.gr>
Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220518013428.1338983-1-xianting.tian@linux.alibaba.com
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/kernel/setup.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index e0373a3056e8..f0f36a4a0e9b 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -190,7 +190,7 @@ 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; @@ -215,7 +215,7 @@ 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; |