From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=205.220.168.131 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793808934; b=lviBiZvgl94eBSAEsHU+xPJL9d5DeLR3ccg9sjNX0uzU21hhBzzYytWUZ+Pelzhb7N0q v1BFOYWYoGh9rMW4UfKQ1YYUoAWrzj1I9DmnIPhvD4KeDKqUmTVdDmja1Gga1L5DE/Wp7 YGX/ztV8LfdXO3qXZ56q6F6nAp2APNzPXlDIfJHD2fwAA3i6PJIu5IEJ3mPw2GFYXtQqD UtCeYD85bsI5FhK+bA0hYBV+g02xKIo5PzEFka1jdcLRpwvuX3WHutWuOVz/W4HkFn6jR PhnC7p8B860qoCvgFMHG9RnbFnlI7Vb9HoPpqvZCZDcM7YbEfoGjiyPMGtRZbJEbL9Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793808934; h=DMARC-Filter:Received:DKIM-Signature:Received:Received:Received: Received:From:To:Cc:Subject:Date:Message-ID:X-Mailer:MIME-Version: Content-Transfer-Encoding:X-Proofpoint-Reinject:X-QCInternal: X-QCInternal:X-Proofpoint-Spam-Details-Enc:X-Authority-Analysis: X-Proofpoint-ORIG-GUID:X-Proofpoint-GUID:X-Proofpoint-Spam-Info: X-Proofpoint-Virus-Version:X-Proofpoint-Spam-Details; bh=jVH1WdWwc2cqdtMVBuZBwnu1HjvA+uxsgPvwECRUhpU=; b=qUnPlkIotc2yqjqmOiZfDvhUSeqccYV/8VqQXfZ9IcXCDb9GBvaO8z8Lrf3aTvWtNsDG RvueWTS6kTjTHRAFsZ3Ev8MjlNEWQlnl9Aa1B+Psa+3H2dJd0mNFLOn9vX0lqhtB7ybc4 G4zACQNlYC+M1MwnDmZ6XxtQUy97euvrl7O7wJJxVPAGEU32fDywhrerKVs3sIeZteLP/ 5ybLzFjC/jaXe4ocm0ZT0fOLHWyCIs9wrLwhC30uPQlepXyTw697MGOt7oyKF/iWY9PCt /Hyb8gBu4uHLACNQ5CanmsA9e9+AwKQskffx491Gk+NbS2WGn0hPtwKVtqii3SUrBlQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=qualcomm.com; dkim=pass header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256 header.s=qcppdkim1 header.b=fnFXmXXM; arc=none smtp.remote-ip=205.220.168.131 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 17EDA606A326; Wed, 4 Nov 2026 16:15:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 17EDA606A326 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256 header.s=qcppdkim1 header.b=fnFXmXXM Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 6A4Fip7C3272812; Wed, 4 Nov 2026 16:15:17 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:date:from:message-id:mime-version :subject:to; s=qcppdkim1; bh=jVH1WdWwc2cqdtMVBuZBwnu1HjvA+uxsgPv wECRUhpU=; b=fnFXmXXMdq3zSC4C1/z2hdl0xwlfzKa4NklsoNHi7Az+RTp+VaH SagXqyFTA+e6UnBA2oRA4WsiO/0OUvM1rlZbCAHnMw8m9Cizu4VzrTRyBJJ1Scjq jqTPmafJ2nKTQZiwr/B1r2+WbCUi1UsojmATfFgfVr3qAfOj313SZZm6xXgeQcwP gNmB5JP616J+H7wx+v3CXwwwQELzMbljV69Nv8ApRk6QrMmQdlo/9ZWJoTJiHnKH r4Tgt96ryftShLVbLKwB11gfyVVM6i8t+DiZX27NrPf7JzzYCDF3DM5qtq7hLObf yfTmfw+NEFs06/5CrVEB2mI5I8Kr1vlvYRA== Received: from apblrppmta01.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4hr6bngeye-1 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Wed, 04 Nov 2026 16:15:17 +0000 (GMT) Received: from pps.filterd (apblrppmta01.qualcomm.com [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (8.18.1.11/8.18.1.11) with ESMTP id 6A4GFD7Q3122607; Wed, 4 Nov 2026 16:15:13 GMT Received: from hu-devc-blr-u24-a.qualcomm.com (hu-anuppate-blr.qualcomm.com [10.131.36.165]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 6A4GFDi03122590 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Wed, 04 Nov 2026 16:15:13 +0000 (GMT) Received: by hu-devc-blr-u24-a.qualcomm.com (Postfix, from userid 486687) id 4760222944; Wed, 4 Nov 2026 21:45:13 +0530 (+0530) From: Anup Patel To: Sunil V L , "Rafael J . Wysocki" Cc: Palmer Dabbelt , Paul Walmsley , Alexandre Ghiti , Len Brown , Atish Patra , Anup Patel , Will Deacon , Mark Rutland , linux-acpi@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v7 0/1] Common csr_read_num() and csr_write_num() for RISC-V Date: Wed, 4 Nov 2026 21:45:11 +0530 Message-ID: <20261104161512.883885-1-anup.patel@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Reinject: loops=2 maxloops=12 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA0MDA2NCBTYWx0ZWRfXwMYEfbYYzoib W+h30IjHo3dnZrnVT/XF9ew2yAkco9QR85L0BcNfw/N6JNedVcBMyye8b4NhWhRXDImfWSflRiv 2zPiKwtid50WvqJSxLCXW/yDWpnjo+e7i5mb6j1op9YsDM5t0crobsXG+xRDPL62ln4zqU92jNM fol2mrT6pVfEwn+qAir9ChPheAMlPdCoDvIrkIjxFst33GyOfug7S2BcpxETH8dYCVGAPsM1cHX N7Ko+GhMMTY6cgmoAOppTeYqJq5x7a1PEdNEi0qxYhlfW+bNWcyrogPSDNXXqpLUkLEkvnjqMBE RNSxN1KgD2hpqgTCGcOfYV9anPnaSgEU2ioiMWyB1KIW9G6gSfTqeMRi6A5Pm7406xgW0wbzu4Z rSIqBy3Nei1L909fk3yj6s6johG1qVWNbHc1VS/BMXY4JBij4uGJbZ9AJkvdFtmUAWvgzgRc2+K 8nJ9DV0wOjF49+fdfqw== X-Authority-Analysis: v=2.4 cv=KLLPn1Fo c=1 sm=1 tr=0 ts=6aeb5a15 cx=c_pps a=Ou0eQOY4+eZoSc0qltEV5Q==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=zJRp6_cAMcgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=NEAV23lmAAAA:8 a=97VCTQuGHz7arqyciaAA:9 X-Proofpoint-ORIG-GUID: JMzeAe4MiFqyn55hnuHbxmeVbb85bzpS X-Proofpoint-GUID: JMzeAe4MiFqyn55hnuHbxmeVbb85bzpS X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA0MDA2NCBTYWx0ZWRfXwIYoJ9rJs/kg D2DK2zbs1LT4A1R8BtQR1mgPwI1V/re/cYbFr3j2Tc8SeiU3oKZKF/MsOagfAdl7308NEAAgW+4 7Hsosi0teXdwjWlEbLxT4E87sZHeC48= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-04_05,2026-11-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 clxscore=1011 phishscore=0 bulkscore=0 spamscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611040064 Some of the RISC-V drivers (such as RISC-V PMU and ACPI CPPC) need to access CSR based on CSR number discovered from somewhere. Add common RISC-V csr_read_num() and csr_write_num() functions under arch/riscv for such drivers. These patches can be found in the riscv_csr_read_num_v7 branch at: https://github.com/avpatel/linux.git Changes since v6: - Rebased on Linux-7.4-rc1 Changes since v5: - Rebased on Linux-7.2-rc5 Changes since v4: - Rebased on Linux-6.19-rc6 Changes since v3: - Rebased on Linux-6.18-rc7 - Updated commit decription of PATCH1 to reflect the fact that we are removing sanity checks on CSR number which are already taken care by csr_read_num() and csr_write_num(). Changes since v2: - Rebased on Linux-6.18-rc1 - Added reviewed-by tags Changes since v1: - Make "out_err" mandatory for csr_read_num() and csr_write_num() in PATCH2 as suggested by Sunil and Drew. This also helps further simplify csr_read_num() and csr_write_num(). Anup Patel (1): RISC-V: Add common csr_read_num() and csr_write_num() functions arch/riscv/include/asm/csr.h | 3 + arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/csr.c | 165 +++++++++++++++++++++++++++++++++++ drivers/acpi/riscv/cppc.c | 17 ++-- drivers/perf/riscv_pmu.c | 54 ++---------- 5 files changed, 184 insertions(+), 56 deletions(-) create mode 100644 arch/riscv/kernel/csr.c -- 2.43.0