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Wed, 18 Jun 2025 10:10:17 -0700 (PDT) Received: from localhost ([2a00:79e0:2e14:7:8f3f:43b2:851d:4290]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-2365d8a19d7sm103032875ad.83.2025.06.18.10.10.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Jun 2025 10:10:16 -0700 (PDT) Date: Wed, 18 Jun 2025 10:10:14 -0700 From: Brian Norris To: Johan Hovold Cc: Aleksandrs Vinarskis , Thomas Gleixner , Tsai Sung-Fu , Douglas Anderson , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/2] genirq: Retain depth for managed IRQs across CPU hotplug Message-ID: References: <20250514201353.3481400-1-briannorris@chromium.org> <20250514201353.3481400-2-briannorris@chromium.org> <24ec4adc-7c80-49e9-93ee-19908a97ab84@gmail.com> 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-Disposition: inline In-Reply-To: On Wed, Jun 18, 2025 at 12:17:17PM +0200, Johan Hovold wrote: > On Thu, Jun 12, 2025 at 11:40:38AM -0700, Brian Norris wrote: > > For the record, I was reminded that DWC/pcie-qcom does not, in fact, > > support irq_chip::irq_set_affinity(), which could perhaps be a unique > > factor in his systems' behavior. > > No, we use the GIC ITS for the NVMe interrupts on X1E so that should > not be involved here. Huh, interesting callout. I had looked at trying that previously on another DWC-based platform, for the same reasons noted in that switchover. Anyway, all I can tell you is that Alex's logs clearly showed: set affinity failed(-22) for what looked like the NVMe interrupts during CPU unplug / migration. Brian