diff mbox series

[v4,01/11] RISC-V: Provide a more helpful error message on invalid ISA strings

Message ID 20230710-uncounted-suffocate-633f57fdecab@wendy (mailing list archive)
State Superseded
Headers show
Series RISC-V: Probe DT extension support using riscv,isa-extensions & riscv,isa-base | expand

Checks

Context Check Description
conchuod/cover_letter success Series has a cover letter
conchuod/tree_selection success Guessed tree name to be for-next at HEAD e8605e8fdf42
conchuod/fixes_present success Fixes tag not required for -next series
conchuod/maintainers_pattern success MAINTAINERS pattern errors before the patch: 4 and now 4
conchuod/verify_signedoff success Signed-off-by tag matches author and committer
conchuod/kdoc success Errors and warnings before: 0 this patch: 0
conchuod/build_rv64_clang_allmodconfig success Errors and warnings before: 8 this patch: 8
conchuod/module_param success Was 0 now: 0
conchuod/build_rv64_gcc_allmodconfig success Errors and warnings before: 9 this patch: 9
conchuod/build_rv32_defconfig success Build OK
conchuod/dtb_warn_rv64 success Errors and warnings before: 3 this patch: 3
conchuod/header_inline success No static functions without inline keyword in header files
conchuod/checkpatch success total: 0 errors, 0 warnings, 0 checks, 17 lines checked
conchuod/build_rv64_nommu_k210_defconfig success Build OK
conchuod/verify_fixes success No Fixes tag
conchuod/build_rv64_nommu_virt_defconfig success Build OK

Commit Message

Conor Dooley July 10, 2023, 9:35 a.m. UTC 
From: Palmer Dabbelt <palmer@rivosinc.com>

Right now we provide a somewhat unhelpful error message on systems with
invalid error messages, something along the lines of

	CPU with hartid=0 is not available
	------------[ cut here ]------------
	kernel BUG at arch/riscv/kernel/smpboot.c:174!
	Kernel BUG [#1]
	Modules linked in:
	CPU: 0 PID: 0 Comm: swapper Not tainted 6.4.0-rc1-00096-ge0097d2c62d5-dirty #1
	Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
	epc : of_parse_and_init_cpus+0x16c/0x16e
	 ra : of_parse_and_init_cpus+0x9a/0x16e
	epc : ffffffff80c04e0a ra : ffffffff80c04d38 sp : ffffffff81603e20
	 gp : ffffffff8182d658 tp : ffffffff81613f80 t0 : 000000000000006e
	 t1 : 0000000000000064 t2 : 0000000000000000 s0 : ffffffff81603e80
	 s1 : 0000000000000000 a0 : 0000000000000000 a1 : 0000000000000000
	 a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000
	 a5 : 0000000000001fff a6 : 0000000000001fff a7 : ffffffff816148b0
	 s2 : 0000000000000001 s3 : ffffffff81492a4c s4 : ffffffff81a4b090
	 s5 : ffffffff81506030 s6 : 0000000000000040 s7 : 0000000000000000
	 s8 : 00000000bfb6f046 s9 : 0000000000000001 s10: 0000000000000000
	 s11: 00000000bf389700 t3 : 0000000000000000 t4 : 0000000000000000
	 t5 : ffffffff824dd188 t6 : ffffffff824dd187
	status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003
	[<ffffffff80c04e0a>] of_parse_and_init_cpus+0x16c/0x16e
	[<ffffffff80c04c96>] setup_smp+0x1e/0x26
	[<ffffffff80c03ffe>] setup_arch+0x6e/0xb2
	[<ffffffff80c00384>] start_kernel+0x72/0x400
	Code: 80e7 4a00 a603 0009 b795 1097 ffe5 80e7 92c0 9002 (9002) 715d
	---[ end trace 0000000000000000 ]---
	Kernel panic - not syncing: Fatal exception in interrupt

Add a warning for the cases where the ISA string isn't valid.  It's still
above the BUG_ON cut, but hopefully it's at least a bit easier for users.

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 arch/riscv/kernel/cpu.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index a2fc952318e9..3af2d214ce21 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -66,11 +66,15 @@  int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *har
 		return -ENODEV;
 	}
 
-	if (IS_ENABLED(CONFIG_32BIT) && strncasecmp(isa, "rv32ima", 7))
+	if (IS_ENABLED(CONFIG_32BIT) && strncasecmp(isa, "rv32ima", 7)) {
+		pr_warn("CPU with hartid=%lu does not support rv32ima", *hart);
 		return -ENODEV;
+	}
 
-	if (IS_ENABLED(CONFIG_64BIT) && strncasecmp(isa, "rv64ima", 7))
+	if (IS_ENABLED(CONFIG_64BIT) && strncasecmp(isa, "rv64ima", 7)) {
+		pr_warn("CPU with hartid=%lu does not support rv64ima", *hart);
 		return -ENODEV;
+	}
 
 	return 0;
 }