From patchwork Mon Jan 22 00:19:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 13524697 X-Patchwork-Delegate: herbert@gondor.apana.org.au Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50E1537E; Mon, 22 Jan 2024 00:22:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705882979; cv=none; b=eE4bCHO+bY/+CXG3u4X2Pta23ENtDKufKpCUHfItVeeXgCL5dkKEhfL5TCWvSDAXzCgeR/qKAxJmB+50u6c4CXtnui9/uKfePURcnWW3f00mt0zfj/EidWLRGV6Q6FLTJVOHbRf8WYQW7YC3iCK2Soce10direMMN6WPwmoJgZ8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705882979; c=relaxed/simple; bh=cu/x3ItAEqexfto4Q62/HSpF8UbXNvIBvj4vMpklLig=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Hilg/JWPBMQ4TDShslQ5k7jbAIYa2GGO9ko8YWJu3wHvpOHL8Cjvg9sKYLL4xhSoVmOUWWcOtUt6lmnJaAd3FRpP7zuCJbzXCWDKwjDcUB7y7oPKlXStKVMSI2Tt5MbdteFH6IYY7y7alYXxwzSyM/tsScbvh86uBCNe4iEqSZE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pHW/j+hV; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pHW/j+hV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB036C43390; Mon, 22 Jan 2024 00:22:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705882978; bh=cu/x3ItAEqexfto4Q62/HSpF8UbXNvIBvj4vMpklLig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pHW/j+hVYcQ07mUuVmoaaAsGPm/61eCDdoJM0ufsYRwR6PrpSPg84A+/4jl51OZqh gRJqHPELv2mQnKLWkuFWnmN6bOuwlKBmo1kkltWLEMQiZiPjAKFOdrKl4xdlX2EfZf MFIuQ/hgBkYKXEw4jZWDBPoLXota/bOJ7wWH+VHTnNr0myYVIsGWL+dLXfLSG7ByEZ 1BvesMZ2YNLNAY8HD4twt8KK1b+kp7/ituTaaXKMTwHXvZAWuFnNZpnQ8pFjZEo8cg 5W2ZkYpsq0PQFU3itAG689+XqQbphjP4Fji+0DZ+zAUPDz9JKqxZOdTSz6bQEq3q68 HayS0AbAwrKxg== From: Eric Biggers To: linux-crypto@vger.kernel.org, linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Albert Ou , Andy Chiu , Ard Biesheuvel , =?utf-8?q?Christoph_M=C3=BCllner?= , Heiko Stuebner , Jerry Shih , Palmer Dabbelt , Paul Walmsley , Phoebe Chen , hongrong.hsu@sifive.com, Heiko Stuebner Subject: [PATCH v3 01/10] RISC-V: add helper function to read the vector VLEN Date: Sun, 21 Jan 2024 16:19:12 -0800 Message-ID: <20240122002024.27477-2-ebiggers@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122002024.27477-1-ebiggers@kernel.org> References: <20240122002024.27477-1-ebiggers@kernel.org> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Heiko Stuebner VLEN describes the length of each vector register and some instructions need specific minimal VLENs to work correctly. The vector code already includes a variable riscv_v_vsize that contains the value of "32 vector registers with vlenb length" that gets filled during boot. vlenb is the value contained in the CSR_VLENB register and the value represents "VLEN / 8". So add riscv_vector_vlen() to return the actual VLEN value for in-kernel users when they need to check the available VLEN. Signed-off-by: Heiko Stuebner Reviewed-by: Eric Biggers Signed-off-by: Jerry Shih Signed-off-by: Eric Biggers --- arch/riscv/include/asm/vector.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/riscv/include/asm/vector.h b/arch/riscv/include/asm/vector.h index 0cd6f0a027d1f..731dcd0ed4de9 100644 --- a/arch/riscv/include/asm/vector.h +++ b/arch/riscv/include/asm/vector.h @@ -277,11 +277,22 @@ static inline bool riscv_v_vstate_ctrl_user_allowed(void) { return false; } #define riscv_v_vstate_restore(vstate, regs) do {} while (0) #define __switch_to_vector(__prev, __next) do {} while (0) #define riscv_v_vstate_off(regs) do {} while (0) #define riscv_v_vstate_on(regs) do {} while (0) #define riscv_v_thread_free(tsk) do {} while (0) #define riscv_v_setup_ctx_cache() do {} while (0) #define riscv_v_thread_alloc(tsk) do {} while (0) #endif /* CONFIG_RISCV_ISA_V */ +/* + * Return the implementation's vlen value. + * + * riscv_v_vsize contains the value of "32 vector registers with vlenb length" + * so rebuild the vlen value in bits from it. + */ +static inline int riscv_vector_vlen(void) +{ + return riscv_v_vsize / 32 * 8; +} + #endif /* ! __ASM_RISCV_VECTOR_H */