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Date: Mon, 26 Jun 2023 14:07:13 +0100
From: Conor Dooley <conor.dooley@...rochip.com>
To: Evan Green <evan@...osinc.com>
CC: Palmer Dabbelt <palmer@...osinc.com>,
Simon Hosie <shosie@...osinc.com>,
Albert Ou <aou@...s.berkeley.edu>,
Andrew Jones <ajones@...tanamicro.com>,
Anup Patel <apatel@...tanamicro.com>,
Greentime Hu <greentime.hu@...ive.com>,
Guo Ren <guoren@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
Jisheng Zhang <jszhang@...nel.org>,
Ley Foon Tan <leyfoon.tan@...rfivetech.com>,
Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Randy Dunlap <rdunlap@...radead.org>,
Samuel Holland <samuel@...lland.org>,
Sunil V L <sunilvl@...tanamicro.com>,
<linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 2/2] RISC-V: alternative: Remove feature_probe_func
Hey Evan,
On Fri, Jun 23, 2023 at 03:20:16PM -0700, Evan Green wrote:
> Now that we're testing unaligned memory copy and making that
> determination generically, there are no more users of the vendor
> feature_probe_func(). While I think it's probably going to need to come
> back, there are no users right now, so let's remove it until it's
> needed.
How come this is done as a separate patch, rather than delete the dead
code as part of the probe addition? Ease of review?
Change itself seems fine to me though, so
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
Cheers,
Conor.
>
> Signed-off-by: Evan Green <evan@...osinc.com>
>
> ---
>
> arch/riscv/errata/thead/errata.c | 8 --------
> arch/riscv/include/asm/alternative.h | 5 -----
> arch/riscv/kernel/alternative.c | 19 -------------------
> arch/riscv/kernel/smpboot.c | 1 -
> 4 files changed, 33 deletions(-)
>
> diff --git a/arch/riscv/errata/thead/errata.c b/arch/riscv/errata/thead/errata.c
> index c259dc925ec1..bf42857c977f 100644
> --- a/arch/riscv/errata/thead/errata.c
> +++ b/arch/riscv/errata/thead/errata.c
> @@ -117,11 +117,3 @@ void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
> if (stage == RISCV_ALTERNATIVES_EARLY_BOOT)
> local_flush_icache_all();
> }
> -
> -void thead_feature_probe_func(unsigned int cpu,
> - unsigned long archid,
> - unsigned long impid)
> -{
> - if ((archid == 0) && (impid == 0))
> - per_cpu(misaligned_access_speed, cpu) = RISCV_HWPROBE_MISALIGNED_FAST;
> -}
> diff --git a/arch/riscv/include/asm/alternative.h b/arch/riscv/include/asm/alternative.h
> index 6a41537826a7..58ccd2f8cab7 100644
> --- a/arch/riscv/include/asm/alternative.h
> +++ b/arch/riscv/include/asm/alternative.h
> @@ -30,7 +30,6 @@
> #define ALT_OLD_PTR(a) __ALT_PTR(a, old_offset)
> #define ALT_ALT_PTR(a) __ALT_PTR(a, alt_offset)
>
> -void probe_vendor_features(unsigned int cpu);
> void __init apply_boot_alternatives(void);
> void __init apply_early_boot_alternatives(void);
> void apply_module_alternatives(void *start, size_t length);
> @@ -53,15 +52,11 @@ void thead_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
> unsigned long archid, unsigned long impid,
> unsigned int stage);
>
> -void thead_feature_probe_func(unsigned int cpu, unsigned long archid,
> - unsigned long impid);
> -
> void riscv_cpufeature_patch_func(struct alt_entry *begin, struct alt_entry *end,
> unsigned int stage);
>
> #else /* CONFIG_RISCV_ALTERNATIVE */
>
> -static inline void probe_vendor_features(unsigned int cpu) { }
> static inline void apply_boot_alternatives(void) { }
> static inline void apply_early_boot_alternatives(void) { }
> static inline void apply_module_alternatives(void *start, size_t length) { }
> diff --git a/arch/riscv/kernel/alternative.c b/arch/riscv/kernel/alternative.c
> index 6b75788c18e6..85056153fa23 100644
> --- a/arch/riscv/kernel/alternative.c
> +++ b/arch/riscv/kernel/alternative.c
> @@ -27,8 +27,6 @@ struct cpu_manufacturer_info_t {
> void (*patch_func)(struct alt_entry *begin, struct alt_entry *end,
> unsigned long archid, unsigned long impid,
> unsigned int stage);
> - void (*feature_probe_func)(unsigned int cpu, unsigned long archid,
> - unsigned long impid);
> };
>
> static void riscv_fill_cpu_mfr_info(struct cpu_manufacturer_info_t *cpu_mfr_info)
> @@ -43,7 +41,6 @@ static void riscv_fill_cpu_mfr_info(struct cpu_manufacturer_info_t *cpu_mfr_info
> cpu_mfr_info->imp_id = sbi_get_mimpid();
> #endif
>
> - cpu_mfr_info->feature_probe_func = NULL;
> switch (cpu_mfr_info->vendor_id) {
> #ifdef CONFIG_ERRATA_SIFIVE
> case SIFIVE_VENDOR_ID:
> @@ -53,7 +50,6 @@ static void riscv_fill_cpu_mfr_info(struct cpu_manufacturer_info_t *cpu_mfr_info
> #ifdef CONFIG_ERRATA_THEAD
> case THEAD_VENDOR_ID:
> cpu_mfr_info->patch_func = thead_errata_patch_func;
> - cpu_mfr_info->feature_probe_func = thead_feature_probe_func;
> break;
> #endif
> default:
> @@ -143,20 +139,6 @@ void riscv_alternative_fix_offsets(void *alt_ptr, unsigned int len,
> }
> }
>
> -/* Called on each CPU as it starts */
> -void probe_vendor_features(unsigned int cpu)
> -{
> - struct cpu_manufacturer_info_t cpu_mfr_info;
> -
> - riscv_fill_cpu_mfr_info(&cpu_mfr_info);
> - if (!cpu_mfr_info.feature_probe_func)
> - return;
> -
> - cpu_mfr_info.feature_probe_func(cpu,
> - cpu_mfr_info.arch_id,
> - cpu_mfr_info.imp_id);
> -}
> -
> /*
> * This is called very early in the boot process (directly after we run
> * a feature detect on the boot CPU). No need to worry about other CPUs
> @@ -211,7 +193,6 @@ void __init apply_boot_alternatives(void)
> /* If called on non-boot cpu things could go wrong */
> WARN_ON(smp_processor_id() != 0);
>
> - probe_vendor_features(0);
> _apply_alternatives((struct alt_entry *)__alt_start,
> (struct alt_entry *)__alt_end,
> RISCV_ALTERNATIVES_BOOT);
> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> index e34a71b4786b..054f2d4474d0 100644
> --- a/arch/riscv/kernel/smpboot.c
> +++ b/arch/riscv/kernel/smpboot.c
> @@ -246,7 +246,6 @@ asmlinkage __visible void smp_callin(void)
> numa_add_cpu(curr_cpuid);
> set_cpu_online(curr_cpuid, 1);
> check_misaligned_access(curr_cpuid);
> - probe_vendor_features(curr_cpuid);
>
> if (has_vector()) {
> if (riscv_v_setup_vsize())
> --
> 2.34.1
>
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