From patchwork Tue Jun 7 13:16:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nikita Shubin X-Patchwork-Id: 12871912 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 9022ACCA47C for ; Tue, 7 Jun 2022 13:18:43 +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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ELsayvXGCY/oZSvbu728dmIl7+xHJ/5wT61/5pj+DRQ=; b=OStzoeLXAC/EaR khBTHKbhNx0iMvauhIlNhS88rJ+B0gynPZcnk5WLS0IdfwZ0YnLWrPec87HTsUvdWA8SsqQMTxY2a 50l1dh7lzIEvCxC9ODbcgZHqnr9Zeqbi+5X2sblQLnZvXPIoGTcNp3mjzlu4yGyGGS8TWTOdevCwd Lx1HnydC/rscvRSHBC1PmEplJ1XFWnYPJqhsFrkT6VScCU8kAZ+jchF7J1B5+ZXdpb+AwxUEgy+kF rcNvjHrow6qb7oON5OGcfjzr+sx0LNLMdiDtc3xluQh2I4NVMhgTRA6q6Xg7Mhi5yz+nG530ZWCdj ySHHWNG5Q+gzWjX7PNnA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nyZ5Q-007chW-Co; Tue, 07 Jun 2022 13:17:32 +0000 Received: from forward501o.mail.yandex.net ([2a02:6b8:0:1a2d::611]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nyZ5H-007cXS-RX; Tue, 07 Jun 2022 13:17:26 +0000 Received: from myt6-26f37b5fec36.qloud-c.yandex.net (myt6-26f37b5fec36.qloud-c.yandex.net [IPv6:2a02:6b8:c12:5527:0:640:26f3:7b5f]) by forward501o.mail.yandex.net (Yandex) with ESMTP id 5183B45C4E6C; Tue, 7 Jun 2022 16:16:56 +0300 (MSK) Received: from myt6-654ec0a0ab93.qloud-c.yandex.net (myt6-654ec0a0ab93.qloud-c.yandex.net [2a02:6b8:c12:1d80:0:640:654e:c0a0]) by myt6-26f37b5fec36.qloud-c.yandex.net (mxback/Yandex) with ESMTP id smaqJmKSH2-GtfeQLwf; Tue, 07 Jun 2022 16:16:56 +0300 X-Yandex-Fwd: 2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=maquefel.me; s=mail; t=1654607816; bh=JvNF2tl4VACbLjlnTM0H4TIIrNNoBngMOz0q/FiVjZc=; h=In-Reply-To:References:Date:Subject:Cc:To:From:Message-Id; b=GwKizgbQ3nskMntGKiwqljCR4wdHj/+4vKGtzccxpe1C/zu43jeu6N0Z3YY5QLCNE uWEItwdNbsgAJmICe+XDiErcvn3CS65MmNoFUGN0PfOcQSFjUzRzFl72WtYX3ApqD+ camc4PT2YMpr77TN4A0atwWhVWkaHMLY0zq6/QmQ= Authentication-Results: myt6-26f37b5fec36.qloud-c.yandex.net; dkim=pass header.i=@maquefel.me Received: by myt6-654ec0a0ab93.qloud-c.yandex.net (smtp/Yandex) with ESMTPSA id sOXgg17Zrk-GrM4PiLo; Tue, 07 Jun 2022 16:16:53 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) From: Nikita Shubin To: Cc: Genevieve Chan , =?utf-8?b?Sm/Do28gTcOh?= =?utf-8?b?cmlvIERvbWluZ29z?= , Nikita Shubin , Paul Walmsley , Palmer Dabbelt , Albert Ou , Atish Patra , Anup Patel , Will Deacon , Mark Rutland , Geert Uytterhoeven , linux-riscv@lists.infradead.org (open list:RISC-V ARCHITECTURE), linux-kernel@vger.kernel.org (open list), linux-arm-kernel@lists.infradead.org (moderated list:ARM PMU PROFILING AND DEBUGGING) Subject: [PATCH v3 1/4] RISC-V: Create unique identification for SoC PMU Date: Tue, 7 Jun 2022 16:16:44 +0300 Message-Id: <20220607131648.29439-2-nikita.shubin@maquefel.me> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220607131648.29439-1-nikita.shubin@maquefel.me> References: <20220607131648.29439-1-nikita.shubin@maquefel.me> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220607_061724_367808_1B1DBC6B X-CRM114-Status: GOOD ( 15.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: João Mário Domingos The SBI PMU platform driver did not provide any identification for perf events matching. This patch introduces a new sysfs file inside the platform device (soc:pmu/id) for pmu identification. The identification is a 64-bit value generated as: [63-32]: mvendorid; [31]: marchid[MSB]; [30-16]: marchid[15-0]; [15-0]: mimpid[15MSBs]; The CSRs are detailed in the RISC-V privileged spec [1]. The marchid is split in MSB + 15LSBs, due to the MSB being used for open-source architecture identification. [1] https://github.com/riscv/riscv-isa-manual Signed-off-by: João Mário Domingos Tested-by: Nikita Shubin --- arch/riscv/kernel/sbi.c | 3 +++ drivers/perf/riscv_pmu_sbi.c | 47 ++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c index 775d3322b422..50dd9b6ecc9e 100644 --- a/arch/riscv/kernel/sbi.c +++ b/arch/riscv/kernel/sbi.c @@ -627,16 +627,19 @@ long sbi_get_mvendorid(void) { return __sbi_base_ecall(SBI_EXT_BASE_GET_MVENDORID); } +EXPORT_SYMBOL(sbi_get_mvendorid); long sbi_get_marchid(void) { return __sbi_base_ecall(SBI_EXT_BASE_GET_MARCHID); } +EXPORT_SYMBOL(sbi_get_marchid); long sbi_get_mimpid(void) { return __sbi_base_ecall(SBI_EXT_BASE_GET_MIMPID); } +EXPORT_SYMBOL(sbi_get_mimpid); static void sbi_send_cpumask_ipi(const struct cpumask *target) { diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index a1317a483512..15ab3dc68e7a 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -693,6 +693,46 @@ static int pmu_sbi_setup_irqs(struct riscv_pmu *pmu, struct platform_device *pde return 0; } +static uint64_t pmu_sbi_get_pmu_id(void) +{ + union sbi_pmu_id { + uint64_t value; + struct { + uint16_t imp:16; + uint16_t arch:16; + uint32_t vendor:32; + }; + } pmuid; + + pmuid.value = 0; + pmuid.vendor = (uint32_t) sbi_get_mvendorid(); + pmuid.arch = (sbi_get_marchid() >> (63 - 15) & (1 << 15)) | (sbi_get_marchid() & 0x7FFF); + pmuid.imp = (sbi_get_mimpid() >> 16); + + return pmuid.value; +} + +static ssize_t pmu_sbi_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int len; + + len = sprintf(buf, "0x%llx\n", pmu_sbi_get_pmu_id()); + if (len <= 0) + dev_err(dev, "mydrv: Invalid sprintf len: %dn", len); + + return len; +} + +static DEVICE_ATTR(id, S_IRUGO | S_IWUSR, pmu_sbi_id_show, 0); + +static struct attribute *pmu_sbi_attrs[] = { + &dev_attr_id.attr, + NULL +}; + +ATTRIBUTE_GROUPS(pmu_sbi); + static int pmu_sbi_device_probe(struct platform_device *pdev) { struct riscv_pmu *pmu = NULL; @@ -729,6 +769,13 @@ static int pmu_sbi_device_probe(struct platform_device *pdev) pmu->ctr_clear_idx = pmu_sbi_ctr_clear_idx; pmu->ctr_read = pmu_sbi_ctr_read; + ret = sysfs_create_group(&pdev->dev.kobj, &pmu_sbi_group); + if (ret) { + dev_err(&pdev->dev, "sysfs creation failed\n"); + return ret; + } + pdev->dev.groups = pmu_sbi_groups; + ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node); if (ret) return ret;