[v3] riscv: add SBI FWFT misaligned exception delegation support

[PATCH v3 06/17] riscv: misaligned: use correct CONFIG_ ifdef for misaligned_access_speed

Posted by Clément Léger 9 months, 2 weeks ago

misaligned_access_speed is defined under CONFIG_RISCV_SCALAR_MISALIGNED
but was used under CONFIG_RISCV_PROBE_UNALIGNED_ACCESS. Fix that by
using the correct config option.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
---
 arch/riscv/kernel/traps_misaligned.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c
index ffac424faa88..7fe25adf2539 100644
--- a/arch/riscv/kernel/traps_misaligned.c
+++ b/arch/riscv/kernel/traps_misaligned.c
@@ -362,7 +362,7 @@ static int handle_scalar_misaligned_load(struct pt_regs *regs)
 
 	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
 
-#ifdef CONFIG_RISCV_PROBE_UNALIGNED_ACCESS
+#ifdef CONFIG_RISCV_SCALAR_MISALIGNED
 	*this_cpu_ptr(&misaligned_access_speed) = RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED;
 #endif
 
-- 
2.47.2

Re: [PATCH v3 06/17] riscv: misaligned: use correct CONFIG_ ifdef for misaligned_access_speed

Posted by Andrew Jones 9 months, 1 week ago

On Mon, Mar 10, 2025 at 04:12:13PM +0100, Clément Léger wrote:
> misaligned_access_speed is defined under CONFIG_RISCV_SCALAR_MISALIGNED
> but was used under CONFIG_RISCV_PROBE_UNALIGNED_ACCESS. Fix that by
> using the correct config option.
> 
> Signed-off-by: Clément Léger <cleger@rivosinc.com>
> ---
>  arch/riscv/kernel/traps_misaligned.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c
> index ffac424faa88..7fe25adf2539 100644
> --- a/arch/riscv/kernel/traps_misaligned.c
> +++ b/arch/riscv/kernel/traps_misaligned.c
> @@ -362,7 +362,7 @@ static int handle_scalar_misaligned_load(struct pt_regs *regs)
>  
>  	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
>  
> -#ifdef CONFIG_RISCV_PROBE_UNALIGNED_ACCESS
> +#ifdef CONFIG_RISCV_SCALAR_MISALIGNED
>  	*this_cpu_ptr(&misaligned_access_speed) = RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED;
>  #endif

Sure, but CONFIG_RISCV_PROBE_UNALIGNED_ACCESS selects
CONFIG_RISCV_SCALAR_MISALIGNED, so this isn't fixing anything. Changing it
does make sense though since this line in handle_scalar_misaligned_load()
"belongs" to check_unaligned_access_emulated() which is also under
CONFIG_RISCV_SCALAR_MISALIGNED. Anyway, all this unaligned configs need a
major cleanup.


Reviewed-by: Andrew Jones <ajones@ventanamicro.com>

Thanks,
drew

>  
> -- 
> 2.47.2
> 
> 
> -- 
> kvm-riscv mailing list
> kvm-riscv@lists.infradead.org
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Re: [PATCH v3 06/17] riscv: misaligned: use correct CONFIG_ ifdef for misaligned_access_speed

Posted by Clément Léger 9 months, 1 week ago


On 13/03/2025 14:06, Andrew Jones wrote:
> On Mon, Mar 10, 2025 at 04:12:13PM +0100, Clément Léger wrote:
>> misaligned_access_speed is defined under CONFIG_RISCV_SCALAR_MISALIGNED
>> but was used under CONFIG_RISCV_PROBE_UNALIGNED_ACCESS. Fix that by
>> using the correct config option.
>>
>> Signed-off-by: Clément Léger <cleger@rivosinc.com>
>> ---
>>  arch/riscv/kernel/traps_misaligned.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c
>> index ffac424faa88..7fe25adf2539 100644
>> --- a/arch/riscv/kernel/traps_misaligned.c
>> +++ b/arch/riscv/kernel/traps_misaligned.c
>> @@ -362,7 +362,7 @@ static int handle_scalar_misaligned_load(struct pt_regs *regs)
>>  
>>  	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
>>  
>> -#ifdef CONFIG_RISCV_PROBE_UNALIGNED_ACCESS
>> +#ifdef CONFIG_RISCV_SCALAR_MISALIGNED
>>  	*this_cpu_ptr(&misaligned_access_speed) = RISCV_HWPROBE_MISALIGNED_SCALAR_EMULATED;
>>  #endif
> 
> Sure, but CONFIG_RISCV_PROBE_UNALIGNED_ACCESS selects
> CONFIG_RISCV_SCALAR_MISALIGNED, so this isn't fixing anything. 

Indeed, that is not fixing anything (hence no Fixes tag), it compiles as
a side effect of Kconfig dependencies.

> Changing it
> does make sense though since this line in handle_scalar_misaligned_load()
> "belongs" to check_unaligned_access_emulated() which is also under
> CONFIG_RISCV_SCALAR_MISALIGNED. Anyway, all this unaligned configs need a
> major cleanup.

Yes, as I said, I'd be advocating to remove all that ifdefery mess.

Thanks,

Clément

> 
> 
> Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
> 
> Thanks,
> drew
> 
>>  
>> -- 
>> 2.47.2
>>
>>
>> -- 
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