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Mon, 03 Aug 2026 15:29:04 -0700 (PDT) X-Received: by 2002:a17:90b:4d05:b0:38e:4f31:8412 with SMTP id 98e67ed59e1d1-38fecc2f007mr1071121a91.11.1785796144318; Mon, 03 Aug 2026 15:29:04 -0700 (PDT) Received: from localhost ([50.35.46.84]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13fab4e44bcsm49863604c88.12.2026.08.03.15.29.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 15:29:04 -0700 (PDT) Date: Mon, 3 Aug 2026 15:28:59 -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 07/11] arm_mpam: propagate MSC access errors for mpam_reprogram_ris_partid() Message-ID: <20260803152859.00006590@oss.qualcomm.com> In-Reply-To: <20260731170324.2927758-8-andre.przywara@arm.com> References: <20260731170324.2927758-1-andre.przywara@arm.com> <20260731170324.2927758-8-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-acpi@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=auOCzyZV c=1 sm=1 tr=0 ts=6a711632 cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=qC1CW/w66vtJz1P9yTJxNA==:17 a=kj9zAlcOel0A:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=7CQSdrXTAAAA:8 a=EUspDBNiAAAA:8 a=_W4zCIwx36R_oyA-FJgA:9 a=CjuIK1q_8ugA:10 a=iS9zxrgQBfv6-_F4QbHw:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-ORIG-GUID: qU-LvlVwdo1t4xdAyAcv1C_p1gNmY0-l X-Proofpoint-Spam-Info: AW1haW4tMjYwODAzMDE5NyBTYWx0ZWRfX+MlSx25M1Qxu pebJbBmKwhKQOL/OvqeoQLafYRVMsyEPro2rxpADP8oy0sE+3ZgitLqwpUEtj6zbBNusybpY6p9 X/GQQ0uXW61IYT2dSHrotM7+LAuiUJc= X-Proofpoint-GUID: qU-LvlVwdo1t4xdAyAcv1C_p1gNmY0-l X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODAzMDE5NyBTYWx0ZWRfX6A5pw7kPj5Ea Gs/knXAUC4xQWuJMLRZaTwT4X4zpYf9MoGOzaNmrhUEK21+TQZPWEseGR3v3mID2SSfhxupVSXW rgtq3RSauBQtF4Rje474PIWYXYSEu7Pmta8T5LD69u1hn2+oRZHzphlLaKy1G5NzCJ/ZnK3g7T1 JORimOMwpRCsbtOQOaB16Tk2yoT3Ki55Mf/geo/9kF/RQ3MUz9CJZNwh2COTSxA/sG2CIQCH+Q8 vz0uBZKWXQOfiyIjIOTqxdlwesuJJBKj4ssEtWNM/s10fhv8RgAJ2QgppuWrsNXXgC9TlEw8jsD KShJfYzh4nat+o/z8HlHvy8bXERQ5Mt2qLXhHAIhuWMZnljlwdz6pgbKTV4Rx/P5NcuuAx8mO16 U4JqpnttDg739WdTrCvqvipnA6+82WaoWKHSYMPuOX7FZiK1wmMm3Tvq4v54711J6jqMlv9tjrT sTsCeDLDKR7yrwz6eUg== 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 priorityscore=1501 spamscore=0 bulkscore=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 phishscore=0 adultscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608030197 On Fri, 31 Jul 2026 19:03:20 +0200 Andre Przywara wrote: > Allow the mpam_reprogram_ris_partid() function check for and return function to check > errors, and propagate MSC read and write errors from the lower level up. > This also covers the callers of this function: mpam_reset_ris() and > apply_config(). > > Signed-off-by: Andre Przywara One thing below to perhaps modify if you are respinning Reviewed-by: Jonathan Cameron > --- > drivers/resctrl/mpam_devices.c | 136 ++++++++++++++++++++++----------- > 1 file changed, 93 insertions(+), 43 deletions(-) > > diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c > index 38450c55e45e..32088ad1d67e 100644 > --- a/drivers/resctrl/mpam_devices.c > +++ b/drivers/resctrl/mpam_devices.c > @@ -1601,7 +1601,7 @@ void mpam_msmon_reset_mbwu(struct mpam_component *comp, struct mon_cfg *ctx) > } > } > > -static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd) > +static int mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd) > { > u32 num_words, msb; > u32 bm = ~0; > @@ -1610,15 +1610,19 @@ static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd) > lockdep_assert_held(&msc->part_sel_lock); > > if (wd == 0) > - return; > + return 0; > > /* > * Write all ~0 to all but the last 32bit-word, which may > * have fewer bits... > */ > num_words = DIV_ROUND_UP(wd, 32); > - for (i = 0; i < num_words - 1; i++, reg += sizeof(bm)) > - __mpam_write_reg(msc, reg, bm); > + for (i = 0; i < num_words - 1; i++, reg += sizeof(bm)) { Not really related to what you are doing here, but if you like you could reduce the scope of i via for (int i = 0;... as it isn't used outside of this loop. > + int ret = __mpam_write_reg(msc, reg, bm); > + > + if (ret) > + return ret; Personally I don't like this style but feel free to ignore as this is very much a personal taste thing. I'd do int ret; ret = __mpam_write_reg(msc, reg, bm); if (ret) return ret; } just to keep the source of error and check for error next to each other. > + }