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Mon, 03 Aug 2026 15:17:10 -0700 (PDT) X-Received: by 2002:a05:6a20:2d09:b0:3b1:cce5:9140 with SMTP id adf61e73a8af0-3c92a75ec8fmr11363071637.33.1785795430445; Mon, 03 Aug 2026 15:17:10 -0700 (PDT) Received: from localhost ([50.35.46.84]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3153dd4f197sm43287766eec.6.2026.08.03.15.17.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 15:17:10 -0700 (PDT) Date: Mon, 3 Aug 2026 15:17:06 -0700 From: Jonathan Cameron To: Andre Przywara Cc: Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , "Rafael J . Wysocki" , Len Brown , James Morse , Ben Horgan , Reinette Chatre , Fenghua Yu , Jonathan Cameron , Srivathsa L Rao , Ganapatrao Kulkarni , Trilok Soni , Srinivas Ramana , Niyas Sait , Lee Trager , Ritwick Sharma , linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 06/11] arm_mpam: propagate MSC access errors for state saving function Message-ID: <20260803151706.000027e6@oss.qualcomm.com> In-Reply-To: <20260731170324.2927758-7-andre.przywara@arm.com> References: <20260731170324.2927758-1-andre.przywara@arm.com> <20260731170324.2927758-7-andre.przywara@arm.com> Organization: Qualcomm X-Mailer: Claws Mail 4.4.0 (GTK 3.24.51; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=SPJykuvH c=1 sm=1 tr=0 ts=6a711367 cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=qC1CW/w66vtJz1P9yTJxNA==:17 a=kj9zAlcOel0A:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=CJK1izrmERu_2sfnVPYA:9 a=CjuIK1q_8ugA:10 a=3WC7DwWrALyhR5TkjVHa:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-ORIG-GUID: -LmVSzskwUgAxAbOfO8e-aQVA5gaSMo2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODAzMDE5NSBTYWx0ZWRfX061a6oedCcr8 A7sYjOXHOEwmrseTadr/bVnnv5YchHxDWL8Z/+Q5qsXsMzhoB7g4aS61fBGiqFpt/om7LagzvMT PMtqalj3Wj/gTPhl9k1Yx6H5UjHPkJGOK3dpDnK+0JDB4Jfe9FoTtpmY0gFGjmhOADFzV9XnkIy kLJqwBN+haPjXSZV8j3s6iI9ZwKx7u1x/HiuBiiqjWHzLw+CXfrsZBn2kg+A9gfx8xB4eaQGzUM gRPXBwaSLsbkhL5BPEKtGncQSEvvBEJFeFSyD9jpMghbHOu/j2z86nsytAsHTr6DCwdcaQS1U3P tDh9PbwbyUUpoZBhK5nVXzHnamknTy5IGYqjkapGhM+UYEs7NOrDqTTjUjoSeQU0xcyWt5st8VM X6zSd84Nu6Ze0yQBwdRnTOTUt+Y5QLKk009oiCeeH3NkHR+3F0QcG1JwVdONGcPFabCM7i6kUrO 9PF9HprEGF2z1bL8DwQ== X-Proofpoint-Spam-Info: AW1haW4tMjYwODAzMDE5NSBTYWx0ZWRfXy6oRF8JWhnXB sSsJIvX7bR3+HEr/uhuK1hV/9i3O3JdKlT5Nfrg9Ou+8J+cjcbmk+9HEsiCp9twUTesab8Eoobt RTVIwDT3oWNs/UoGZeUyFSpTETvwfU0= X-Proofpoint-GUID: -LmVSzskwUgAxAbOfO8e-aQVA5gaSMo2 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-03_05,2026-08-03_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 spamscore=0 phishscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608030195 On Fri, 31 Jul 2026 19:03:19 +0200 Andre Przywara wrote: > Allow the mpam_save_mbwu_state() function to return an error, and > propagate read and write errors from the lower level up. > > Signed-off-by: Andre Przywara > Reviewed-by: Jonathan Cameron > Reviewed-by: Ben Horgan If you happen to be respinning i think the code grouping vs white space in here could be slightly improved. > --- > drivers/resctrl/mpam_devices.c | 29 ++++++++++++++++++++++------- > 1 file changed, 22 insertions(+), 7 deletions(-) > > diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c > index fa8ed20a6740..38450c55e45e 100644 > --- a/drivers/resctrl/mpam_devices.c > +++ b/drivers/resctrl/mpam_devices.c > @@ -1838,22 +1838,37 @@ static int mpam_save_mbwu_state(void *arg) > > mon_sel = FIELD_PREP(MSMON_CFG_MON_SEL_MON_SEL, i) | > FIELD_PREP(MSMON_CFG_MON_SEL_RIS, ris->ris_idx); > - mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel); > - mpam_read_monsel_reg(msc, CFG_MBWU_FLT, &cur_flt); > - mpam_read_monsel_reg(msc, CFG_MBWU_CTL, &cur_ctl); > - mpam_write_monsel_reg(msc, CFG_MBWU_CTL, 0); > + ret = mpam_write_monsel_reg(msc, CFG_MON_SEL, mon_sel); > + if (ret) > + return ret; > + ret = mpam_read_monsel_reg(msc, CFG_MBWU_FLT, &cur_flt); > + if (ret) > + return ret; > + ret = mpam_read_monsel_reg(msc, CFG_MBWU_CTL, &cur_ctl); > + if (ret) > + return ret; > + ret = mpam_write_monsel_reg(msc, CFG_MBWU_CTL, 0); > + if (ret) > + return ret; > > if (mpam_ris_has_mbwu_long_counter(ris)) { > ret = mpam_msc_read_mbwu_l(msc, &val); > if (ret) > return ret; > - mpam_msc_zero_mbwu_l(msc); > + ret = mpam_msc_zero_mbwu_l(msc); > + if (ret) > + return ret; > } else { > u32 val32; > > - mpam_read_monsel_reg(msc, MBWU, &val32); > + ret = mpam_read_monsel_reg(msc, MBWU, &val32); > + if (ret) > + return ret; > + > val = val32; > - mpam_write_monsel_reg(msc, MBWU, 0); > + ret = mpam_write_monsel_reg(msc, MBWU, 0); > + if (ret) > + return ret; The grouping via white space usage here seems less than ideal. You have: ret = mpam_read_monsel_reg(msc, MBWU, &val32); if (ret) return ret; val = val32; // this looks to be part of block below not above. ret = mpam_write_monsel_reg(msc, MBWU, 0); if (ret) return ret; Probably: ret = mpam_read_monsel_reg(msc, MBWU, &val32); if (ret) return ret; val = val32; // Now it is in groups with related code. ret = mpam_write_monsel_reg(msc, MBWU, 0); if (ret) return ret; Or don't have a blank line in there at all. > } > > cfg->mon = i;