linux-kernel - [PATCH -next] riscv: kdump: fix crashkernel reserving problem on RISC-V

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Message-ID: <20230922030722.708267-1-chenjiahao16@huawei.com>
Date:   Fri, 22 Sep 2023 11:07:22 +0800
From:   Chen Jiahao <chenjiahao16@...wei.com>
To:     <bhe@...hat.com>, <thunder.leizhen@...wei.com>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <conor.dooley@...rochip.com>,
        <alexghiti@...osinc.com>, <ajones@...tanamicro.com>,
        <jszhang@...nel.org>, <sunilvl@...tanamicro.com>,
        <robh@...nel.org>, <bjorn@...osinc.com>, <zephray@...look.com>,
        <akpm@...ux-foundation.org>, <linux-riscv@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <chenjiahao16@...wei.com>
Subject: [PATCH -next] riscv: kdump: fix crashkernel reserving problem on RISC-V

When testing on risc-v QEMU environment with "crashkernel="
parameter enabled, a problem occurred with the following
message:

[    0.000000] crashkernel low memory reserved: 0xf8000000 - 0x100000000 (128 MB)
[    0.000000] crashkernel reserved: 0x0000000177e00000 - 0x0000000277e00000 (4096 MB)
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at kernel/resource.c:779 __insert_resource+0x8e/0xd0
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.6.0-rc2-next-20230920 #1
[    0.000000] Hardware name: riscv-virtio,qemu (DT)
[    0.000000] epc : __insert_resource+0x8e/0xd0
[    0.000000]  ra : insert_resource+0x28/0x4e
[    0.000000] epc : ffffffff80017344 ra : ffffffff8001742e sp : ffffffff81203db0
[    0.000000]  gp : ffffffff812ece98 tp : ffffffff8120dac0 t0 : ff600001f7ff2b00
[    0.000000]  t1 : 0000000000000000 t2 : 3428203030303030 s0 : ffffffff81203dc0
[    0.000000]  s1 : ffffffff81211e18 a0 : ffffffff81211e18 a1 : ffffffff81289380
[    0.000000]  a2 : 0000000277dfffff a3 : 0000000177e00000 a4 : 0000000177e00000
[    0.000000]  a5 : ffffffff81289380 a6 : 0000000277dfffff a7 : 0000000000000078
[    0.000000]  s2 : ffffffff81289380 s3 : ffffffff80a0bac8 s4 : ff600001f7ff2880
[    0.000000]  s5 : 0000000000000280 s6 : 8000000a00006800 s7 : 000000000000007f
[    0.000000]  s8 : 0000000080017038 s9 : 0000000080038ea0 s10: 0000000000000000
[    0.000000]  s11: 0000000000000000 t3 : ffffffff80a0bc00 t4 : ffffffff80a0bc00
[    0.000000]  t5 : ffffffff80a0bbd0 t6 : ffffffff80a0bc00
[    0.000000] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003
[    0.000000] [<ffffffff80017344>] __insert_resource+0x8e/0xd0
[    0.000000] ---[ end trace 0000000000000000 ]---
[    0.000000] Failed to add a Crash kernel resource at 177e00000

The crashkernel memory has been allocated successfully, whereas
it failed to insert into iomem_resource. This is due to the
unique reserving logic in risc-v arch specific code, i.e.
crashk_res/crashk_low_res will be added into iomem_resource
later in init_resources(), which is not aligned with current
unified reserving logic in reserve_crashkernel_generic()/
reserve_crashkernel_low().

Removing the arch specific code within #ifdef CONFIG_KEXEC_CORE
in init_resources() to fix above problem.

Fixes: 31549153088e ("riscv: kdump: use generic interface to simplify crashkernel reservation")
Signed-off-by: Chen Jiahao <chenjiahao16@...wei.com>
---
 arch/riscv/kernel/setup.c | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index e600aab116a4..aac853ae4eb7 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -173,19 +173,6 @@ static void __init init_resources(void)
 	if (ret < 0)
 		goto error;
 
-#ifdef CONFIG_KEXEC_CORE
-	if (crashk_res.start != crashk_res.end) {
-		ret = add_resource(&iomem_resource, &crashk_res);
-		if (ret < 0)
-			goto error;
-	}
-	if (crashk_low_res.start != crashk_low_res.end) {
-		ret = add_resource(&iomem_resource, &crashk_low_res);
-		if (ret < 0)
-			goto error;
-	}
-#endif
-
 #ifdef CONFIG_CRASH_DUMP
 	if (elfcorehdr_size > 0) {
 		elfcorehdr_res.start = elfcorehdr_addr;
-- 
2.34.1