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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSssp-00079y-4U; Fri, 08 Nov 2019 01:16:15 +0000 Received: from szxga06-in.huawei.com ([45.249.212.32] helo=huawei.com) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iSssm-00079Y-5R for linux-arm-kernel@lists.infradead.org; Fri, 08 Nov 2019 01:16:14 +0000 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 9EB77961D09A7F459505; Fri, 8 Nov 2019 09:16:07 +0800 (CST) Received: from [127.0.0.1] (10.74.221.148) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.439.0; Fri, 8 Nov 2019 09:15:57 +0800 Subject: Re: [PATCH] drivers/perf: hisi: update the sccl_id/ccl_id for certain HiSilicon platform To: Mark Rutland , John Garry References: <1573113364-32531-1-git-send-email-zhangshaokun@hisilicon.com> <20191107114041.GB11587@willie-the-truck> <52f89b8c-0baf-77d0-4bbd-1e129f8e5ed2@huawei.com> <20191107115650.GA4948@lakrids.cambridge.arm.com> <14e778fb-7b71-3927-134a-415f9a83eae7@huawei.com> <20191107121151.GB4948@lakrids.cambridge.arm.com> From: Shaokun Zhang Message-ID: Date: Fri, 8 Nov 2019 09:15:57 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: <20191107121151.GB4948@lakrids.cambridge.arm.com> X-Originating-IP: [10.74.221.148] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191107_171612_390569_A4FE12D5 X-CRM114-Status: GOOD ( 17.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Will Deacon , linux-arm-kernel@lists.infradead.org, Hanjun Guo Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Mark, On 2019/11/7 20:11, Mark Rutland wrote: > On Thu, Nov 07, 2019 at 12:06:24PM +0000, John Garry wrote: >> On 07/11/2019 11:56, Mark Rutland wrote: >>> On Thu, Nov 07, 2019 at 11:50:30AM +0000, John Garry wrote: >>>> On 07/11/2019 11:40, Will Deacon wrote: >>>>> Hi, >>>>> >>>>> On Thu, Nov 07, 2019 at 03:56:04PM +0800, Shaokun Zhang wrote: >>>>>> @@ -338,8 +339,10 @@ void hisi_uncore_pmu_disable(struct pmu *pmu) >>>>>> /* >>>>>> * Read Super CPU cluster and CPU cluster ID from MPIDR_EL1. >>>>>> - * If multi-threading is supported, CCL_ID is the low 3-bits in MPIDR[Aff2] >>>>>> - * and SCCL_ID is the upper 5-bits of Aff2 field; if not, SCCL_ID >>>>>> + * If multi-threading is supported, On Huawei Kunpeng 920 SoC whose cpu >>>>>> + * core is tsv110, CCL_ID is the low 3-bits in MPIDR[Aff2] and SCCL_ID >>>>>> + * is the upper 5-bits of Aff2 field; while for other cpu types, SCCL_ID >>>>>> + * is in MPIDR[Aff3] and CCL_ID is in MPIDR[Aff2], if not, SCCL_ID >>>>>> * is in MPIDR[Aff2] and CCL_ID is in MPIDR[Aff1]. >>>>>> */ >>>>>> static void hisi_read_sccl_and_ccl_id(int *sccl_id, int *ccl_id) >>>>>> @@ -347,12 +350,19 @@ static void hisi_read_sccl_and_ccl_id(int *sccl_id, int *ccl_id) >>>>>> u64 mpidr = read_cpuid_mpidr(); >>>>>> if (mpidr & MPIDR_MT_BITMASK) { >>>>>> - int aff2 = MPIDR_AFFINITY_LEVEL(mpidr, 2); >>>>>> - >>>>>> - if (sccl_id) >>>>>> - *sccl_id = aff2 >> 3; >>>>>> - if (ccl_id) >>>>>> - *ccl_id = aff2 & 0x7; >>>>>> + if (read_cpuid_part_number() == HISI_CPU_PART_TSV110) { >>>>>> + int aff2 = MPIDR_AFFINITY_LEVEL(mpidr, 2); >>>>>> + >>>>>> + if (sccl_id) >>>>>> + *sccl_id = aff2 >> 3; >>>>>> + if (ccl_id) >>>>>> + *ccl_id = aff2 & 0x7; >>>>>> + } else { >>>>>> + if (sccl_id) >>>>>> + *sccl_id = MPIDR_AFFINITY_LEVEL(mpidr, 3); >>>>>> + if (ccl_id) >>>>>> + *ccl_id = MPIDR_AFFINITY_LEVEL(mpidr, 2); >>>>>> + } >>>>> >>>>> [I prefer Mark's version, so please reply to indicate whether or not it >>>>> works for you] >>>> >>>> Replying on Shaokun's behalf as he appears offline now. >>>> >>>> In response to "> If TSV110 is always MT, ": >>>> >>>> It isn't. There are 2 spins of Huawei Kunpeng 920 SoC which includes >>>> TaishanV110 aka TSV110: one has the MT bit set and the other without. >>> >>> Just to check, for the non-MT variant is the SCCL/CCL assignment >>> Aff2/Aff1 as with other non-MT parts? >> >> We don't support any other non-MT parts for this driver. > > The driver claimed to support non-MT parts before TSV110 came around, so that > statement confuses me. > Apologies that I reply a little later because of stepout and other things, I was not online. My description is a little obscure so the comment is really confused: Under the condition that MT field is set, TSV110 core on Kunpeng 920: SCCL is Aff2[7:3], CCL is Aff2[2:0]; If MT field is not, TSV110 core on Kunpeng 920: SCCL is Aff2[7:0], CCL is Aff1[7:0] And as John said that "We don't support any other non-MT parts for this driver." > For a non-MT TSV110, is Aff2 the SCCL and Aff1 the CCL? That's what the Right. > existing code (and Shaokun's patch) assumed. > > Assuming that is the case, I'd suggest we have the following: > > /* > * The Super CPU Cluster (SCCL) and CPU Cluster (CCL) IDs can be > * determined from the MPIDR_EL1, but the encoding varies by CPU: > * > * - For MT variants of TSV110 (e.g. found in Kunpeng 920): > * SCCL is Aff2[7:3], CCL is Aff2[2:0] > * > * - For other MT parts: > * SCCL is Aff3[7:0], CCL is Aff2[7:0] > * > * - For non-MT parts: > * SCCL is Aff2[7:0], CCL is Aff1[7:0] > */ > static void hisi_read_sccl_and_ccl_id(int *scclp, int *cclp) > { > u64 mpidr = read_cpuid_mpidr(); > int aff3 = MPIDR_AFFINITY_LEVEL(mpidr, 3); > int aff2 = MPIDR_AFFINITY_LEVEL(mpidr, 2); > int aff1 = MPIDR_AFFINITY_LEVEL(mpidr, 1); > bool mt = mpdir & MPIDR_MT_BITMASK; > int sccl, ccl; > > if (mt && read_cpuid_part_number() == HISI_CPU_PART_TSV110) { > sccl = aff2 >> 3; > ccl = aff2 & 0x7; > } else if (mt) { > sccl = aff3; > ccl = aff2; > } else { > sccl = aff2; > ccl = aff1; > } > > if (scclp) > *scclp = sccl; > if (cclp) > *cclp = ccl; > } > It works and Thanks your nice comment. > Thanks, > Mark. > > . > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel