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Fri, 26 Apr 2024 01:15:38 -0700 (PDT) X-Forwarded-Encrypted: i=1; AJvYcCV2peKlD0BC4adYUoDwIM3tyMv8l9DagYNfbJA/6yMsbheCAdhxV05rnNG3D47qBGmZDJw//AFqTPe2vsdkf2ogNLM78Hab8VLjV+lkRKOvzWm5BG6QUJRJHTYzqVHiiypCw7rikajLnOxg0aX8rONeTmjC/f0BfOKBc9AVFJwSqKrX4UU7nvcLwF//L7iwJS7mccGTt/WMhcYVDS1pVfLTStg1fg== X-Gm-Message-State: AOJu0YwGYQkBGiTU6qJCtNGn1Smb2Xjjwc21Se9MFmSzi0aHfKOPHwDt WiqYt/i02t7CsxWy4nU5NpbK8TYHgN5xhxTYf1k0axBoAjygVVKbvbu8rY3E7VpJGFEnfYC95LM Vpf5BhDCaSMlT0WRPoKGqmG1vYck= X-Google-Smtp-Source: AGHT+IFdWL+1rtvTdjZLYM58Wr/hUAPW6s+thTjch0dqfysVmrhP+T23KFGnV1/pBKaELJeFZArRbXJifhaQCJxXF9c= X-Received: by 2002:a50:99c7:0:b0:572:3f41:25aa with SMTP id n7-20020a5099c7000000b005723f4125aamr1644329edb.11.1714119337224; Fri, 26 Apr 2024 01:15:37 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20240420-dev-charlie-support_thead_vector_6_9-v3-0-67cff4271d1d@rivosinc.com> <20240420-dev-charlie-support_thead_vector_6_9-v3-1-67cff4271d1d@rivosinc.com> In-Reply-To: <20240420-dev-charlie-support_thead_vector_6_9-v3-1-67cff4271d1d@rivosinc.com> From: Guo Ren Date: Fri, 26 Apr 2024 16:15:25 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v3 01/17] riscv: cpufeature: Fix thead vector hwcap removal To: Charlie Jenkins Cc: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Conor Dooley , Evan Green , =?UTF-8?B?Q2zDqW1lbnQgTMOpZ2Vy?= , Jonathan Corbet , Shuah Khan , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Palmer Dabbelt , linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, Apr 21, 2024 at 9:04=E2=80=AFAM Charlie Jenkins wrote: > > The riscv_cpuinfo struct that contains mvendorid and marchid is not > populated until all harts are booted which happens after the DT parsing. > Use the vendorid/archid values from the DT if available or assume all > harts have the same values as the boot hart as a fallback. > > Fixes: d82f32202e0d ("RISC-V: Ignore V from the riscv,isa DT property on = older T-Head CPUs") > Signed-off-by: Charlie Jenkins > Reviewed-by: Conor Dooley > --- > arch/riscv/include/asm/sbi.h | 2 ++ > arch/riscv/kernel/cpu.c | 40 ++++++++++++++++++++++++++++++++++++= ---- > arch/riscv/kernel/cpufeature.c | 12 ++++++++++-- > 3 files changed, 48 insertions(+), 6 deletions(-) > > diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h > index 6e68f8dff76b..0fab508a65b3 100644 > --- a/arch/riscv/include/asm/sbi.h > +++ b/arch/riscv/include/asm/sbi.h > @@ -370,6 +370,8 @@ static inline int sbi_remote_fence_i(const struct cpu= mask *cpu_mask) { return -1 > static inline void sbi_init(void) {} > #endif /* CONFIG_RISCV_SBI */ > > +unsigned long riscv_get_mvendorid(void); > +unsigned long riscv_get_marchid(void); > unsigned long riscv_cached_mvendorid(unsigned int cpu_id); > unsigned long riscv_cached_marchid(unsigned int cpu_id); > unsigned long riscv_cached_mimpid(unsigned int cpu_id); > diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c > index d11d6320fb0d..c1f3655238fd 100644 > --- a/arch/riscv/kernel/cpu.c > +++ b/arch/riscv/kernel/cpu.c > @@ -139,6 +139,34 @@ int riscv_of_parent_hartid(struct device_node *node,= unsigned long *hartid) > return -1; > } > > +unsigned long __init riscv_get_marchid(void) > +{ > + struct riscv_cpuinfo *ci =3D this_cpu_ptr(&riscv_cpuinfo); > + > +#if IS_ENABLED(CONFIG_RISCV_SBI) > + ci->marchid =3D sbi_spec_is_0_1() ? 0 : sbi_get_marchid(); > +#elif IS_ENABLED(CONFIG_RISCV_M_MODE) > + ci->marchid =3D csr_read(CSR_MARCHID); > +#else > + ci->marchid =3D 0; > +#endif > + return ci->marchid; > +} > + > +unsigned long __init riscv_get_mvendorid(void) > +{ > + struct riscv_cpuinfo *ci =3D this_cpu_ptr(&riscv_cpuinfo); > + > +#if IS_ENABLED(CONFIG_RISCV_SBI) > + ci->mvendorid =3D sbi_spec_is_0_1() ? 0 : sbi_get_mvendorid(); > +#elif IS_ENABLED(CONFIG_RISCV_M_MODE) > + ci->mvendorid =3D csr_read(CSR_MVENDORID); > +#else > + ci->mvendorid =3D 0; > +#endif > + return ci->mvendorid; > +} > + > DEFINE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo); > > unsigned long riscv_cached_mvendorid(unsigned int cpu_id) > @@ -170,12 +198,16 @@ static int riscv_cpuinfo_starting(unsigned int cpu) > struct riscv_cpuinfo *ci =3D this_cpu_ptr(&riscv_cpuinfo); > > #if IS_ENABLED(CONFIG_RISCV_SBI) > - ci->mvendorid =3D sbi_spec_is_0_1() ? 0 : sbi_get_mvendorid(); > - ci->marchid =3D sbi_spec_is_0_1() ? 0 : sbi_get_marchid(); > + if (!ci->mvendorid) > + ci->mvendorid =3D sbi_spec_is_0_1() ? 0 : sbi_get_mvendor= id(); > + if (!ci->marchid) > + ci->marchid =3D sbi_spec_is_0_1() ? 0 : sbi_get_marchid()= ; > ci->mimpid =3D sbi_spec_is_0_1() ? 0 : sbi_get_mimpid(); > #elif IS_ENABLED(CONFIG_RISCV_M_MODE) > - ci->mvendorid =3D csr_read(CSR_MVENDORID); > - ci->marchid =3D csr_read(CSR_MARCHID); > + if (!ci->mvendorid) > + ci->mvendorid =3D csr_read(CSR_MVENDORID); > + if (!ci->marchid) > + ci->marchid =3D csr_read(CSR_MARCHID); > ci->mimpid =3D csr_read(CSR_MIMPID); > #else > ci->mvendorid =3D 0; > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeatur= e.c > index 3ed2359eae35..c6e27b45e192 100644 > --- a/arch/riscv/kernel/cpufeature.c > +++ b/arch/riscv/kernel/cpufeature.c > @@ -490,6 +490,8 @@ static void __init riscv_fill_hwcap_from_isa_string(u= nsigned long *isa2hwcap) > struct acpi_table_header *rhct; > acpi_status status; > unsigned int cpu; > + u64 boot_vendorid; > + u64 boot_archid; > > if (!acpi_disabled) { > status =3D acpi_get_table(ACPI_SIG_RHCT, 0, &rhct); > @@ -497,6 +499,13 @@ static void __init riscv_fill_hwcap_from_isa_string(= unsigned long *isa2hwcap) > return; > } > > + /* > + * Naively assume that all harts have the same mvendorid/marchid = as the > + * boot hart. > + */ > + boot_vendorid =3D riscv_get_mvendorid(); > + boot_archid =3D riscv_get_marchid(); > + > for_each_possible_cpu(cpu) { > struct riscv_isainfo *isainfo =3D &hart_isa[cpu]; > unsigned long this_hwcap =3D 0; > @@ -544,8 +553,7 @@ static void __init riscv_fill_hwcap_from_isa_string(u= nsigned long *isa2hwcap) > * CPU cores with the ratified spec will contain non-zero > * marchid. > */ > - if (acpi_disabled && riscv_cached_mvendorid(cpu) =3D=3D T= HEAD_VENDOR_ID && > - riscv_cached_marchid(cpu) =3D=3D 0x0) { > + if (acpi_disabled && boot_vendorid =3D=3D THEAD_VENDOR_ID= && boot_archid =3D=3D 0x0) { LGTM! Reviewed-by: Guo Ren > this_hwcap &=3D ~isa2hwcap[RISCV_ISA_EXT_v]; > clear_bit(RISCV_ISA_EXT_v, isainfo->isa); > } > > -- > 2.44.0 > --=20 Best Regards Guo Ren From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 18D1BC4345F for ; Fri, 26 Apr 2024 08:15:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:Subject:Message-ID:Date:From: In-Reply-To:References:MIME-Version:Reply-To:Content-ID:Content-Description: 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Subject: Re: [PATCH v3 01/17] riscv: cpufeature: Fix thead vector hwcap removal To: Charlie Jenkins Cc: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Conor Dooley , Evan Green , =?UTF-8?B?Q2zDqW1lbnQgTMOpZ2Vy?= , Jonathan Corbet , Shuah Khan , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Palmer Dabbelt , linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240426_011541_540749_EA9EF9B3 X-CRM114-Status: GOOD ( 25.45 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 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2002:a50:99c7:0:b0:572:3f41:25aa with SMTP id n7-20020a5099c7000000b005723f4125aamr1644329edb.11.1714119337224; Fri, 26 Apr 2024 01:15:37 -0700 (PDT) MIME-Version: 1.0 References: <20240420-dev-charlie-support_thead_vector_6_9-v3-0-67cff4271d1d@rivosinc.com> <20240420-dev-charlie-support_thead_vector_6_9-v3-1-67cff4271d1d@rivosinc.com> In-Reply-To: <20240420-dev-charlie-support_thead_vector_6_9-v3-1-67cff4271d1d@rivosinc.com> From: Guo Ren Date: Fri, 26 Apr 2024 16:15:25 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v3 01/17] riscv: cpufeature: Fix thead vector hwcap removal To: Charlie Jenkins Cc: Conor Dooley , Rob Herring , Krzysztof Kozlowski , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Conor Dooley , Evan Green , =?UTF-8?B?Q2zDqW1lbnQgTMOpZ2Vy?= , Jonathan Corbet , Shuah Khan , linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Palmer Dabbelt , 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