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Thu, 5 Oct 2023 15:33:15 -0700 Message-ID: <69b8ded0-7648-80bd-c41b-c591b0f861ef@quicinc.com> Date: Thu, 5 Oct 2023 15:33:14 -0700 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v4 4/4] firmware: arm_scmi: Add qcom hvc/shmem transport support To: Bjorn Andersson , Sudeep Holla CC: , , , , , , , , , 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> <20231005222016.GI3553829@hu-bjorande-lv.qualcomm.com> Content-Language: en-US From: Nikunj Kela In-Reply-To: <20231005222016.GI3553829@hu-bjorande-lv.qualcomm.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) 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-GUID: zWNE7LW-QekoHznHQ7t6FM-CyQDjR4op X-Proofpoint-ORIG-GUID: zWNE7LW-QekoHznHQ7t6FM-CyQDjR4op 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_17,2023-10-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 suspectscore=0 adultscore=0 priorityscore=1501 mlxscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 impostorscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310050171 X-Spam-Status: No, score=-6.3 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On 10/5/2023 3:20 PM, Bjorn Andersson wrote: > 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? That was done to keep it uniform across smc32/smc64 conventions. > > Regards, > Bjorn