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Thu, 05 Oct 2023 22:20:18 +0000 Received: from nalasex01c.na.qualcomm.com (nalasex01c.na.qualcomm.com [10.47.97.35]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 395MKHlg017242 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 5 Oct 2023 22:20:17 GMT Received: from hu-bjorande-lv.qualcomm.com (10.49.16.6) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Thu, 5 Oct 2023 15:20:17 -0700 Date: Thu, 5 Oct 2023 15:20:16 -0700 From: Bjorn Andersson To: Sudeep Holla CC: Nikunj Kela , , , , , , , , , , Subject: Re: [PATCH v4 4/4] firmware: arm_scmi: Add qcom hvc/shmem transport support Message-ID: <20231005222016.GI3553829@hu-bjorande-lv.qualcomm.com> References: <20230718160833.36397-1-quic_nkela@quicinc.com> <20230911194359.27547-1-quic_nkela@quicinc.com> <20230911194359.27547-5-quic_nkela@quicinc.com> <20231003111914.63z35sn3r3k7drtp@bogus> <6246714a-3b40-e1b6-640e-560ba55b6436@quicinc.com> <20231004160630.pxspafszlt6o7oj6@bogus> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20231004160630.pxspafszlt6o7oj6@bogus> X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: UDw0cKnzIBCJJ4L7j24wEV5YOwKBRLD4 X-Proofpoint-GUID: UDw0cKnzIBCJJ4L7j24wEV5YOwKBRLD4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-05_16,2023-10-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 suspectscore=0 impostorscore=0 bulkscore=0 spamscore=0 mlxlogscore=999 priorityscore=1501 mlxscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310050169 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231005_152036_177732_D27CEF45 X-CRM114-Status: GOOD ( 23.98 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Oct 04, 2023 at 05:06:30PM +0100, Sudeep Holla wrote: > On Tue, Oct 03, 2023 at 09:16:27AM -0700, Nikunj Kela wrote: > > On 10/3/2023 4:19 AM, Sudeep Holla wrote: > > > On Mon, Sep 11, 2023 at 12:43:59PM -0700, Nikunj Kela wrote: > > > > diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c [..] > > > > @@ -63,6 +66,8 @@ struct scmi_smc { > > > > u32 func_id; > > > > u32 param_page; > > > > u32 param_offset; > > > > + u64 cap_id; > > > Can it be unsigned long instead so that it just works for both 32 and 64 bit. > > > > My first version of this patch was ulong but Bjorn suggested to make this > > structure size fixed i.e. architecture independent. Hence changed it to u64. > > If you are ok with ulong, I can change it back to ulong. > > > > SMCCC pre-v1.2 used the common structure in that way. I don't see any issue > with that. I haven't followed Bjorn suggestions/comments though. > My request was that funcId and capId is an ABI between the firmware and the OS, so I'd like for that to use well defined, fixed sized, data types - if nothing else just for documentation purpose. These values will be truncated when passed to arm_smccc_1_1_invoke() anyways, so I don't have any opinion against using unsigned long here... PS. I understand why func_id is u32, but why are param_page and param_offset u32? Regards, Bjorn _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel