From: Greentime Hu <greentime.hu@sifive.com> To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu, palmer@dabbelt.com, paul.walmsley@sifive.com, vincent.chen@sifive.com Subject: [RFC PATCH v8 06/21] riscv: Add has_vector/riscv_vsize to save vector features. Date: Thu, 9 Sep 2021 01:45:18 +0800 [thread overview] Message-ID: <05f277fa32f74cefc76a8171abd7430e772753e3.1631121222.git.greentime.hu@sifive.com> (raw) In-Reply-To: <cover.1631121222.git.greentime.hu@sifive.com> This patch is used to detect vector support status of CPU and use riscv_vsize to save the size of all the vector registers. It assumes all harts has the same capabilities in SMP system. [guoren@linux.alibaba.com: add has_vector checking] Signed-off-by: Greentime Hu <greentime.hu@sifive.com> Co-developed-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Co-developed-by: Vincent Chen <vincent.chen@sifive.com> Signed-off-by: Vincent Chen <vincent.chen@sifive.com> --- arch/riscv/kernel/cpufeature.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 7069e55335d0..7265d947d981 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -21,6 +21,10 @@ static DECLARE_BITMAP(riscv_isa, RISCV_ISA_EXT_MAX) __read_mostly; #ifdef CONFIG_FPU __ro_after_init DEFINE_STATIC_KEY_FALSE(cpu_hwcap_fpu); #endif +#ifdef CONFIG_VECTOR +bool has_vector __read_mostly; +unsigned long riscv_vsize __read_mostly; +#endif /** * riscv_isa_extension_base() - Get base extension word @@ -149,4 +153,12 @@ void __init riscv_fill_hwcap(void) if (elf_hwcap & (COMPAT_HWCAP_ISA_F | COMPAT_HWCAP_ISA_D)) static_branch_enable(&cpu_hwcap_fpu); #endif + +#ifdef CONFIG_VECTOR + if (elf_hwcap & COMPAT_HWCAP_ISA_V) { + has_vector = true; + /* There are 32 vector registers with vlenb length. */ + riscv_vsize = csr_read(CSR_VLENB) * 32; + } +#endif } -- 2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Greentime Hu <greentime.hu@sifive.com> To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu, palmer@dabbelt.com, paul.walmsley@sifive.com, vincent.chen@sifive.com Subject: [RFC PATCH v8 06/21] riscv: Add has_vector/riscv_vsize to save vector features. Date: Thu, 9 Sep 2021 01:45:18 +0800 [thread overview] Message-ID: <05f277fa32f74cefc76a8171abd7430e772753e3.1631121222.git.greentime.hu@sifive.com> (raw) In-Reply-To: <cover.1631121222.git.greentime.hu@sifive.com> This patch is used to detect vector support status of CPU and use riscv_vsize to save the size of all the vector registers. It assumes all harts has the same capabilities in SMP system. [guoren@linux.alibaba.com: add has_vector checking] Signed-off-by: Greentime Hu <greentime.hu@sifive.com> Co-developed-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Co-developed-by: Vincent Chen <vincent.chen@sifive.com> Signed-off-by: Vincent Chen <vincent.chen@sifive.com> --- arch/riscv/kernel/cpufeature.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 7069e55335d0..7265d947d981 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -21,6 +21,10 @@ static DECLARE_BITMAP(riscv_isa, RISCV_ISA_EXT_MAX) __read_mostly; #ifdef CONFIG_FPU __ro_after_init DEFINE_STATIC_KEY_FALSE(cpu_hwcap_fpu); #endif +#ifdef CONFIG_VECTOR +bool has_vector __read_mostly; +unsigned long riscv_vsize __read_mostly; +#endif /** * riscv_isa_extension_base() - Get base extension word @@ -149,4 +153,12 @@ void __init riscv_fill_hwcap(void) if (elf_hwcap & (COMPAT_HWCAP_ISA_F | COMPAT_HWCAP_ISA_D)) static_branch_enable(&cpu_hwcap_fpu); #endif + +#ifdef CONFIG_VECTOR + if (elf_hwcap & COMPAT_HWCAP_ISA_V) { + has_vector = true; + /* There are 32 vector registers with vlenb length. */ + riscv_vsize = csr_read(CSR_VLENB) * 32; + } +#endif } -- 2.31.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2021-09-08 17:45 UTC|newest] Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-08 17:45 [RFC PATCH v8 00/21] riscv: Add vector ISA support Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 01/21] riscv: Separate patch for cflags and aflags Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 02/21] riscv: Rename __switch_to_aux -> fpu Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 03/21] riscv: Extending cpufeature.c to detect V-extension Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 04/21] riscv: Add new csr defines related to vector extension Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 05/21] riscv: Add vector feature to compile Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` Greentime Hu [this message] 2021-09-08 17:45 ` [RFC PATCH v8 06/21] riscv: Add has_vector/riscv_vsize to save vector features Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 07/21] riscv: Reset vector register Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 08/21] riscv: Add vector struct and assembler definitions Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 09/21] riscv: Add task switch support for vector Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 20:47 ` kernel test robot 2021-09-08 20:47 ` kernel test robot 2021-09-13 12:21 ` Darius Rad 2021-09-13 12:21 ` Darius Rad 2021-09-28 14:56 ` Greentime Hu 2021-09-28 14:56 ` Greentime Hu 2021-09-29 13:28 ` Darius Rad 2021-09-29 13:28 ` Darius Rad 2021-10-01 2:46 ` Ley Foon Tan 2021-10-01 2:46 ` Ley Foon Tan 2021-10-04 12:41 ` Greentime Hu 2021-10-04 12:41 ` Greentime Hu 2021-10-05 2:12 ` Ley Foon Tan 2021-10-05 2:12 ` Ley Foon Tan 2021-10-05 15:46 ` Greentime Hu 2021-10-05 15:46 ` Greentime Hu 2021-10-07 10:10 ` Ley Foon Tan 2021-10-07 10:10 ` Ley Foon Tan 2021-10-04 12:36 ` Greentime Hu 2021-10-04 12:36 ` Greentime Hu 2021-10-05 13:57 ` Darius Rad 2021-10-05 13:57 ` Darius Rad 2021-10-21 1:01 ` Paul Walmsley 2021-10-21 1:01 ` Paul Walmsley 2021-10-21 10:50 ` Darius Rad 2021-10-21 10:50 ` Darius Rad 2021-10-22 3:52 ` Vincent Chen 2021-10-22 3:52 ` Vincent Chen 2021-10-22 10:40 ` Darius Rad 2021-10-22 10:40 ` Darius Rad 2021-10-25 4:47 ` Greentime Hu 2021-10-25 4:47 ` Greentime Hu 2021-10-25 16:22 ` Darius Rad 2021-10-25 16:22 ` Darius Rad 2021-10-26 4:44 ` Greentime Hu 2021-10-26 4:44 ` Greentime Hu 2021-10-27 12:58 ` Darius Rad 2021-10-27 12:58 ` Darius Rad 2021-11-09 9:49 ` Greentime Hu 2021-11-09 9:49 ` Greentime Hu 2021-11-09 19:21 ` Darius Rad 2021-11-09 19:21 ` Darius Rad 2021-10-26 14:58 ` Heiko Stübner 2021-10-26 14:58 ` Heiko Stübner 2021-09-08 17:45 ` [RFC PATCH v8 10/21] riscv: Add ptrace vector support Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 11/21] riscv: Add sigcontext save/restore for vector Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-30 2:37 ` Ley Foon Tan 2021-09-30 2:37 ` Ley Foon Tan 2021-09-08 17:45 ` [RFC PATCH v8 12/21] riscv: signal: Report signal frame size to userspace via auxv Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 13/21] riscv: Add support for kernel mode vector Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-09 6:17 ` Christoph Hellwig 2021-09-09 6:17 ` Christoph Hellwig 2021-09-08 17:45 ` [RFC PATCH v8 14/21] riscv: Use CSR_STATUS to replace sstatus in vector.S Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 15/21] riscv: Add vector extension XOR implementation Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-09 6:12 ` Christoph Hellwig 2021-09-09 6:12 ` Christoph Hellwig 2021-09-28 7:00 ` Greentime Hu 2021-09-28 7:00 ` Greentime Hu 2021-09-14 8:29 ` Ley Foon Tan 2021-09-14 8:29 ` Ley Foon Tan 2021-09-28 7:01 ` Greentime Hu 2021-09-28 7:01 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 16/21] riscv: Initialize vector registers with proper vsetvli then it can work normally Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 17/21] riscv: Optimize vector registers initialization Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 18/21] riscv: Fix an illegal instruction exception when accessing vlenb without enable vector first Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 19/21] riscv: Allocate space for vector registers in start_thread() Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 20/21] riscv: Optimize task switch codes of vector Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-15 14:29 ` Jisheng Zhang 2021-09-15 14:29 ` Jisheng Zhang 2021-10-04 14:13 ` Greentime Hu 2021-10-04 14:13 ` Greentime Hu 2021-09-08 17:45 ` [RFC PATCH v8 21/21] riscv: Turn has_vector into a static key if VECTOR=y Greentime Hu 2021-09-08 17:45 ` Greentime Hu 2021-09-15 14:24 ` Jisheng Zhang 2021-09-15 14:24 ` Jisheng Zhang 2021-10-04 15:04 ` Greentime Hu 2021-10-04 15:04 ` Greentime Hu 2021-09-13 1:47 ` [RFC PATCH v8 00/21] riscv: Add vector ISA support Vincent Chen 2021-09-13 1:47 ` Vincent Chen 2021-09-13 17:18 ` Vineet Gupta 2021-09-13 17:18 ` Vineet Gupta
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