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LoongArch: Add detection for SC.Q support 

Check the CPUCFG2_SCQ bit to determine if the current CPU supports the
SC.Q instruction.

Reviewed-by: Hengqi Chen <hengqi.chen@gmail.com>
Tested-by: Hengqi Chen <hengqi.chen@gmail.com>
Co-developed-by: Yangyang Lian <lianyangyang@kylinos.cn>
Signed-off-by: Yangyang Lian <lianyangyang@kylinos.cn>
Signed-off-by: George Guo <guodongtai@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
master
George Guo 2026-02-10 19:31:06 +08:00 committed by Huacai Chen
parent 07d5798aad
commit 48543c4283
5 changed files with 39 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/loongarch/include/asm/cpu-features.h
View File

@ -35,6 +35,7 @@
*/
#define cpu_has_cpucfg cpu_opt(LOONGARCH_CPU_CPUCFG)
#define cpu_has_lam cpu_opt(LOONGARCH_CPU_LAM)
#define cpu_has_scq cpu_opt(LOONGARCH_CPU_SCQ)
#define cpu_has_ual cpu_opt(LOONGARCH_CPU_UAL)
#define cpu_has_fpu cpu_opt(LOONGARCH_CPU_FPU)
#define cpu_has_lsx cpu_opt(LOONGARCH_CPU_LSX)

62
arch/loongarch/include/asm/cpu.h
View File

@ -95,39 +95,41 @@ static inline char *id_to_core_name(unsigned int id)
*/
#define CPU_FEATURE_CPUCFG 0 /* CPU has CPUCFG */
#define CPU_FEATURE_LAM 1 /* CPU has Atomic instructions */
#define CPU_FEATURE_UAL 2 /* CPU supports unaligned access */
#define CPU_FEATURE_FPU 3 /* CPU has FPU */
#define CPU_FEATURE_LSX 4 /* CPU has LSX (128-bit SIMD) */
#define CPU_FEATURE_LASX 5 /* CPU has LASX (256-bit SIMD) */
#define CPU_FEATURE_CRC32 6 /* CPU has CRC32 instructions */
#define CPU_FEATURE_COMPLEX 7 /* CPU has Complex instructions */
#define CPU_FEATURE_CRYPTO 8 /* CPU has Crypto instructions */
#define CPU_FEATURE_LVZ 9 /* CPU has Virtualization extension */
#define CPU_FEATURE_LBT_X86 10 /* CPU has X86 Binary Translation */
#define CPU_FEATURE_LBT_ARM 11 /* CPU has ARM Binary Translation */
#define CPU_FEATURE_LBT_MIPS 12 /* CPU has MIPS Binary Translation */
#define CPU_FEATURE_TLB 13 /* CPU has TLB */
#define CPU_FEATURE_CSR 14 /* CPU has CSR */
#define CPU_FEATURE_IOCSR 15 /* CPU has IOCSR */
#define CPU_FEATURE_WATCH 16 /* CPU has watchpoint registers */
#define CPU_FEATURE_VINT 17 /* CPU has vectored interrupts */
#define CPU_FEATURE_CSRIPI 18 /* CPU has CSR-IPI */
#define CPU_FEATURE_EXTIOI 19 /* CPU has EXT-IOI */
#define CPU_FEATURE_PREFETCH 20 /* CPU has prefetch instructions */
#define CPU_FEATURE_PMP 21 /* CPU has perfermance counter */
#define CPU_FEATURE_SCALEFREQ 22 /* CPU supports cpufreq scaling */
#define CPU_FEATURE_FLATMODE 23 /* CPU has flat mode */
#define CPU_FEATURE_EIODECODE 24 /* CPU has EXTIOI interrupt pin decode mode */
#define CPU_FEATURE_GUESTID 25 /* CPU has GuestID feature */
#define CPU_FEATURE_HYPERVISOR 26 /* CPU has hypervisor (running in VM) */
#define CPU_FEATURE_PTW 27 /* CPU has hardware page table walker */
#define CPU_FEATURE_LSPW 28 /* CPU has LSPW (lddir/ldpte instructions) */
#define CPU_FEATURE_MSGINT 29 /* CPU has MSG interrupt */
#define CPU_FEATURE_AVECINT 30 /* CPU has AVEC interrupt */
#define CPU_FEATURE_REDIRECTINT 31 /* CPU has interrupt remapping */
#define CPU_FEATURE_SCQ 2 /* CPU has SC.Q instruction */
#define CPU_FEATURE_UAL 3 /* CPU supports unaligned access */
#define CPU_FEATURE_FPU 4 /* CPU has FPU */
#define CPU_FEATURE_LSX 5 /* CPU has LSX (128-bit SIMD) */
#define CPU_FEATURE_LASX 6 /* CPU has LASX (256-bit SIMD) */
#define CPU_FEATURE_CRC32 7 /* CPU has CRC32 instructions */
#define CPU_FEATURE_COMPLEX 8 /* CPU has Complex instructions */
#define CPU_FEATURE_CRYPTO 9 /* CPU has Crypto instructions */
#define CPU_FEATURE_LVZ 10 /* CPU has Virtualization extension */
#define CPU_FEATURE_LBT_X86 11 /* CPU has X86 Binary Translation */
#define CPU_FEATURE_LBT_ARM 12 /* CPU has ARM Binary Translation */
#define CPU_FEATURE_LBT_MIPS 13 /* CPU has MIPS Binary Translation */
#define CPU_FEATURE_TLB 14 /* CPU has TLB */
#define CPU_FEATURE_CSR 15 /* CPU has CSR */
#define CPU_FEATURE_IOCSR 16 /* CPU has IOCSR */
#define CPU_FEATURE_WATCH 17 /* CPU has watchpoint registers */
#define CPU_FEATURE_VINT 18 /* CPU has vectored interrupts */
#define CPU_FEATURE_CSRIPI 19 /* CPU has CSR-IPI */
#define CPU_FEATURE_EXTIOI 20 /* CPU has EXT-IOI */
#define CPU_FEATURE_PREFETCH 21 /* CPU has prefetch instructions */
#define CPU_FEATURE_PMP 22 /* CPU has perfermance counter */
#define CPU_FEATURE_SCALEFREQ 23 /* CPU supports cpufreq scaling */
#define CPU_FEATURE_FLATMODE 24 /* CPU has flat mode */
#define CPU_FEATURE_EIODECODE 25 /* CPU has EXTIOI interrupt pin decode mode */
#define CPU_FEATURE_GUESTID 26 /* CPU has GuestID feature */
#define CPU_FEATURE_HYPERVISOR 27 /* CPU has hypervisor (running in VM) */
#define CPU_FEATURE_PTW 28 /* CPU has hardware page table walker */
#define CPU_FEATURE_LSPW 29 /* CPU has LSPW (lddir/ldpte instructions) */
#define CPU_FEATURE_MSGINT 30 /* CPU has MSG interrupt */
#define CPU_FEATURE_AVECINT 31 /* CPU has AVEC interrupt */
#define CPU_FEATURE_REDIRECTINT 32 /* CPU has interrupt remapping */
#define LOONGARCH_CPU_CPUCFG BIT_ULL(CPU_FEATURE_CPUCFG)
#define LOONGARCH_CPU_LAM BIT_ULL(CPU_FEATURE_LAM)
#define LOONGARCH_CPU_SCQ BIT_ULL(CPU_FEATURE_SCQ)
#define LOONGARCH_CPU_UAL BIT_ULL(CPU_FEATURE_UAL)
#define LOONGARCH_CPU_FPU BIT_ULL(CPU_FEATURE_FPU)
#define LOONGARCH_CPU_LSX BIT_ULL(CPU_FEATURE_LSX)

1
arch/loongarch/include/uapi/asm/hwcap.h
View File

@ -18,5 +18,6 @@
#define HWCAP_LOONGARCH_LBT_MIPS (1 << 12)
#define HWCAP_LOONGARCH_PTW (1 << 13)
#define HWCAP_LOONGARCH_LSPW (1 << 14)
#define HWCAP_LOONGARCH_SCQ (1 << 15)
#endif /* _UAPI_ASM_HWCAP_H */

4
arch/loongarch/kernel/cpu-probe.c
View File

@ -177,6 +177,10 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c)
c->options |= LOONGARCH_CPU_LAM;
elf_hwcap |= HWCAP_LOONGARCH_LAM;
}
if (config & CPUCFG2_SCQ) {
c->options |= LOONGARCH_CPU_SCQ;
elf_hwcap |= HWCAP_LOONGARCH_SCQ;
}
if (config & CPUCFG2_FP) {
c->options |= LOONGARCH_CPU_FPU;
elf_hwcap |= HWCAP_LOONGARCH_FPU;

1
arch/loongarch/kernel/proc.c
View File

@ -62,6 +62,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
seq_printf(m, "Features\t\t:");
if (cpu_has_cpucfg) seq_printf(m, " cpucfg");
if (cpu_has_lam) seq_printf(m, " lam");
if (cpu_has_scq) seq_printf(m, " scq");
if (cpu_has_ual) seq_printf(m, " ual");
if (cpu_has_fpu) seq_printf(m, " fpu");
if (cpu_has_lsx) seq_printf(m, " lsx");