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Message-Id: <20230801221138.2086734-3-evan@rivosinc.com>
Date: Tue, 1 Aug 2023 15:11:37 -0700
From: Evan Green <evan@...osinc.com>
To: Palmer Dabbelt <palmer@...osinc.com>
Cc: David Laight <David.Laight@...lab.com>,
Simon Hosie <shosie@...osinc.com>,
Evan Green <evan@...osinc.com>,
Conor Dooley <conor.dooley@...rochip.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>,
Marc Zyngier <maz@...nel.org>,
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: [PATCH v3 2/2] RISC-V: alternative: Remove feature_probe_func
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.
Signed-off-by: Evan Green <evan@...osinc.com>
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
---
(no changes since v1)
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 be84b14f0118..0554ed4bf087 100644
--- a/arch/riscv/errata/thead/errata.c
+++ b/arch/riscv/errata/thead/errata.c
@@ -120,11 +120,3 @@ 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 00ddbd2364dc..1b8da4e40a4d 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -247,7 +247,6 @@ asmlinkage __visible void smp_callin(void)
numa_add_cpu(curr_cpuid);
set_cpu_online(curr_cpuid, 1);
check_unaligned_access(curr_cpuid);
- probe_vendor_features(curr_cpuid);
if (has_vector()) {
if (riscv_v_setup_vsize())
--
2.34.1
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