| Message ID | 20220604124052.1550-2-jiaxun.yang@flygoat.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | [for-5.19,1/2] irqchip/loongson-liointc: Use architecture register to get coreid | expand |
Hi, Jiaxun, On Sat, Jun 4, 2022 at 8:41 PM Jiaxun Yang <jiaxun.yang@flygoat.com> wrote: > > Only low 9 bits of CPUID CSR represents coreid, higher bits > are marked as reserved. In case Loongson may define higher > bits in future, just mask them out for get_csr_cpuid. I think we needn't to modify, until the high bits actually get defined. :) Huacai > > Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> > --- > arch/loongarch/include/asm/loongarch.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h > index 3ba4f7e87cd2..7f3933f747f9 100644 > --- a/arch/loongarch/include/asm/loongarch.h > +++ b/arch/loongarch/include/asm/loongarch.h > @@ -1200,7 +1200,7 @@ static inline u64 drdtime(void) > > static inline unsigned int get_csr_cpuid(void) > { > - return csr_read32(LOONGARCH_CSR_CPUID); > + return csr_read32(LOONGARCH_CSR_CPUID) & CSR_CPUID_COREID; > } > > static inline void csr_any_send(unsigned int addr, unsigned int data, > -- > 2.25.1 >
diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h index 3ba4f7e87cd2..7f3933f747f9 100644 --- a/arch/loongarch/include/asm/loongarch.h +++ b/arch/loongarch/include/asm/loongarch.h @@ -1200,7 +1200,7 @@ static inline u64 drdtime(void) static inline unsigned int get_csr_cpuid(void) { - return csr_read32(LOONGARCH_CSR_CPUID); + return csr_read32(LOONGARCH_CSR_CPUID) & CSR_CPUID_COREID; } static inline void csr_any_send(unsigned int addr, unsigned int data,
Only low 9 bits of CPUID CSR represents coreid, higher bits are marked as reserved. In case Loongson may define higher bits in future, just mask them out for get_csr_cpuid. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> --- arch/loongarch/include/asm/loongarch.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)