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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 18 Mar 2020 15:24:50 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02IFOnS351773446 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 18 Mar 2020 15:24:49 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 130324C044; Wed, 18 Mar 2020 15:24:49 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 53E154C058; Wed, 18 Mar 2020 15:24:47 +0000 (GMT) Received: from drishya.in.ibm.com (unknown [9.85.107.162]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Wed, 18 Mar 2020 15:24:47 +0000 (GMT) Date: Wed, 18 Mar 2020 20:54:41 +0530 From: Vaidyanathan Srinivasan To: Pratik Rajesh Sampat Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, mpe@ellerman.id.au, ego@linux.vnet.ibm.com, linuxram@us.ibm.com, psampat@in.ibm.com, pratik.r.sampat@gmail.com Subject: Re: [PATCH v5 3/3] powerpc/powernv: Parse device tree, population of SPR support Reply-To: svaidy@linux.ibm.com References: <20200317141018.42380-1-psampat@linux.ibm.com> <20200317141018.42380-4-psampat@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20200317141018.42380-4-psampat@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 20031815-0008-0000-0000-0000035F6A76 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20031815-0009-0000-0000-00004A80C551 Message-Id: <20200318152441.GC5273@drishya.in.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.645 definitions=2020-03-18_06:2020-03-18,2020-03-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 suspectscore=1 mlxlogscore=999 priorityscore=1501 impostorscore=0 phishscore=0 clxscore=1015 adultscore=0 malwarescore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180070 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Pratik Rajesh Sampat [2020-03-17 19:40:18]: > Parse the device tree for nodes self-save, self-restore and populate > support for the preferred SPRs based what was advertised by the device > tree. > > Signed-off-by: Pratik Rajesh Sampat > Reviewed-by: Ram Pai Reviewed-by: Vaidyanathan Srinivasan > > --- > .../bindings/powerpc/opal/power-mgt.txt | 10 +++ > arch/powerpc/platforms/powernv/idle.c | 78 +++++++++++++++++++ > 2 files changed, 88 insertions(+) > > diff --git a/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt b/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt > index 9d619e955576..093cb5fe3d2d 100644 > --- a/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt > +++ b/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt > @@ -116,3 +116,13 @@ otherwise. The length of all the property arrays must be the same. > which of the fields of the PMICR are set in the corresponding > entries in ibm,cpu-idle-state-pmicr. This is an optional > property on POWER8 and is absent on POWER9. > + > +- self-restore: > + Array of unsigned 64-bit values containing a property for sprn-mask > + with each bit indicating the index of the supported SPR for the > + functionality. This is an optional property for both Power8 and Power9 > + > +- self-save: > + Array of unsigned 64-bit values containing a property for sprn-mask > + with each bit indicating the index of the supported SPR for the > + functionality. This is an optional property for both Power8 and Power9 > diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c > index 97aeb45e897b..c39111b338ff 100644 > --- a/arch/powerpc/platforms/powernv/idle.c > +++ b/arch/powerpc/platforms/powernv/idle.c > @@ -1436,6 +1436,81 @@ static void __init pnv_probe_idle_states(void) > supported_cpuidle_states |= pnv_idle_states[i].flags; > } > > +/* > + * Extracts and populates the self save or restore capabilities > + * passed from the device tree node > + */ > +static int extract_save_restore_state_dt(struct device_node *np, int type) > +{ > + int nr_sprns = 0, i, bitmask_index; > + u64 *temp_u64; > + u64 bit_pos; > + > + nr_sprns = of_property_count_u64_elems(np, "sprn-bitmask"); > + if (nr_sprns <= 0) > + return -EINVAL; > + temp_u64 = kcalloc(nr_sprns, sizeof(u64), GFP_KERNEL); > + if (of_property_read_u64_array(np, "sprn-bitmask", > + temp_u64, nr_sprns)) { > + pr_warn("cpuidle-powernv: failed to find registers in DT\n"); > + kfree(temp_u64); > + return -EINVAL; > + } > + /* > + * Populate acknowledgment of support for the sprs in the global vector > + * gotten by the registers supplied by the firmware. > + * The registers are in a bitmask, bit index within > + * that specifies the SPR > + */ > + for (i = 0; i < nr_preferred_sprs; i++) { > + bitmask_index = BIT_WORD(preferred_sprs[i].spr); > + bit_pos = BIT_MASK(preferred_sprs[i].spr); > + if ((temp_u64[bitmask_index] & bit_pos) == 0) { > + if (type == SELF_RESTORE_TYPE) > + preferred_sprs[i].supported_mode &= > + ~SELF_RESTORE_STRICT; > + else > + preferred_sprs[i].supported_mode &= > + ~SELF_SAVE_STRICT; > + continue; > + } > + if (type == SELF_RESTORE_TYPE) { > + preferred_sprs[i].supported_mode |= > + SELF_RESTORE_STRICT; > + } else { > + preferred_sprs[i].supported_mode |= > + SELF_SAVE_STRICT; > + } > + } > + > + kfree(temp_u64); > + return 0; > +} > + > +static int pnv_parse_deepstate_dt(void) > +{ > + struct device_node *np; > + int rc = 0, i; > + > + /* Self restore register population */ > + np = of_find_compatible_node(NULL, NULL, "ibm,opal-self-restore"); > + if (np) { > + rc = extract_save_restore_state_dt(np, SELF_RESTORE_TYPE); > + if (rc != 0) > + return rc; > + } > + /* Self save register population */ > + np = of_find_compatible_node(NULL, NULL, "ibm,opal-self-save"); > + if (!np) { > + for (i = 0; i < nr_preferred_sprs; i++) > + preferred_sprs[i].supported_mode &= ~SELF_SAVE_STRICT; > + } else { > + rc = extract_save_restore_state_dt(np, SELF_SAVE_TYPE); > + } > + of_node_put(np); > + return rc; > +} > + > /* > * This function parses device-tree and populates all the information > * into pnv_idle_states structure. It also sets up nr_pnv_idle_states > @@ -1584,6 +1659,9 @@ static int __init pnv_init_idle_states(void) > return rc; > pnv_probe_idle_states(); > > + rc = pnv_parse_deepstate_dt(); > + if (rc) > + return rc; > if (!cpu_has_feature(CPU_FTR_ARCH_300)) { > if (!(supported_cpuidle_states & OPAL_PM_SLEEP_ENABLED_ER1)) { > power7_fastsleep_workaround_entry = false; > -- Thanks Michael for the detailed review and feedback. Your review comments have been addressed by Pratik. --Vaidy