Re: [PATCH 4.14 17/61] MIPS: Treat Loongson Extensions as ASEs

[Greg Kroah-Hartman]

On Thu, Oct 10, 2019 at 10:36:42AM +0200, Greg Kroah-Hartman wrote:
> From: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
> 
> commit d2f965549006acb865c4638f1f030ebcefdc71f6 upstream.
> 
> Recently, binutils had split Loongson-3 Extensions into four ASEs:
> MMI, CAM, EXT, EXT2. This patch do the samething in kernel and expose
> them in cpuinfo so applications can probe supported ASEs at runtime.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
> Cc: Huacai Chen <chenhc@xxxxxxxxxx>
> Cc: Yunqiang Su <ysu@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # v4.14+
> Signed-off-by: Paul Burton <paul.burton@xxxxxxxx>
> Cc: linux-mips@xxxxxxxxxxxxxxx
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> 
> ---
>  arch/mips/include/asm/cpu-features.h |   16 ++++++++++++++++
>  arch/mips/include/asm/cpu.h          |    4 ++++
>  arch/mips/kernel/cpu-probe.c         |    6 ++++++
>  arch/mips/kernel/proc.c              |    4 ++++
>  4 files changed, 30 insertions(+)
> 
> --- a/arch/mips/include/asm/cpu-features.h
> +++ b/arch/mips/include/asm/cpu-features.h
> @@ -348,6 +348,22 @@
>  #define cpu_has_dsp3		(cpu_data[0].ases & MIPS_ASE_DSP3)
>  #endif
>  
> +#ifndef cpu_has_loongson_mmi
> +#define cpu_has_loongson_mmi		__ase(MIPS_ASE_LOONGSON_MMI)
> +#endif
> +
> +#ifndef cpu_has_loongson_cam
> +#define cpu_has_loongson_cam		__ase(MIPS_ASE_LOONGSON_CAM)
> +#endif
> +
> +#ifndef cpu_has_loongson_ext
> +#define cpu_has_loongson_ext		__ase(MIPS_ASE_LOONGSON_EXT)
> +#endif
> +
> +#ifndef cpu_has_loongson_ext2
> +#define cpu_has_loongson_ext2		__ase(MIPS_ASE_LOONGSON_EXT2)
> +#endif
> +
>  #ifndef cpu_has_mipsmt
>  #define cpu_has_mipsmt		(cpu_data[0].ases & MIPS_ASE_MIPSMT)
>  #endif
> --- a/arch/mips/include/asm/cpu.h
> +++ b/arch/mips/include/asm/cpu.h
> @@ -433,5 +433,9 @@ enum cpu_type_enum {
>  #define MIPS_ASE_MSA		0x00000100 /* MIPS SIMD Architecture */
>  #define MIPS_ASE_DSP3		0x00000200 /* Signal Processing ASE Rev 3*/
>  #define MIPS_ASE_MIPS16E2	0x00000400 /* MIPS16e2 */
> +#define MIPS_ASE_LOONGSON_MMI	0x00000800 /* Loongson MultiMedia extensions Instructions */
> +#define MIPS_ASE_LOONGSON_CAM	0x00001000 /* Loongson CAM */
> +#define MIPS_ASE_LOONGSON_EXT	0x00002000 /* Loongson EXTensions */
> +#define MIPS_ASE_LOONGSON_EXT2	0x00004000 /* Loongson EXTensions R2 */
>  
>  #endif /* _ASM_CPU_H */
> --- a/arch/mips/kernel/cpu-probe.c
> +++ b/arch/mips/kernel/cpu-probe.c
> @@ -1478,6 +1478,8 @@ static inline void cpu_probe_legacy(stru
>  			__cpu_name[cpu] = "ICT Loongson-3";
>  			set_elf_platform(cpu, "loongson3a");
>  			set_isa(c, MIPS_CPU_ISA_M64R1);
> +			c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
> +				MIPS_ASE_LOONGSON_EXT);
>  			break;
>  		case PRID_REV_LOONGSON3B_R1:
>  		case PRID_REV_LOONGSON3B_R2:
> @@ -1485,6 +1487,8 @@ static inline void cpu_probe_legacy(stru
>  			__cpu_name[cpu] = "ICT Loongson-3";
>  			set_elf_platform(cpu, "loongson3b");
>  			set_isa(c, MIPS_CPU_ISA_M64R1);
> +			c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
> +				MIPS_ASE_LOONGSON_EXT);
>  			break;
>  		}
>  
> @@ -1845,6 +1849,8 @@ static inline void cpu_probe_loongson(st
>  		decode_configs(c);
>  		c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE;
>  		c->writecombine = _CACHE_UNCACHED_ACCELERATED;
> +		c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
> +			MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2);
>  		break;
>  	default:
>  		panic("Unknown Loongson Processor ID!");
> --- a/arch/mips/kernel/proc.c
> +++ b/arch/mips/kernel/proc.c
> @@ -124,6 +124,10 @@ static int show_cpuinfo(struct seq_file
>  	if (cpu_has_eva)	seq_printf(m, "%s", " eva");
>  	if (cpu_has_htw)	seq_printf(m, "%s", " htw");
>  	if (cpu_has_xpa)	seq_printf(m, "%s", " xpa");
> +	if (cpu_has_loongson_mmi)	seq_printf(m, "%s", " loongson-mmi");
> +	if (cpu_has_loongson_cam)	seq_printf(m, "%s", " loongson-cam");
> +	if (cpu_has_loongson_ext)	seq_printf(m, "%s", " loongson-ext");
> +	if (cpu_has_loongson_ext2)	seq_printf(m, "%s", " loongson-ext2");
>  	seq_printf(m, "\n");
>  
>  	if (cpu_has_mmips) {
> 
> 

This patch is causing build errors in 4.14, so I am dropping it.  Please
provide a working version if you all want to see it in here.

thanks,

greg k-h