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Fri, 10 Jul 2026 14:23:12 -0700 (PDT) Received: from ubuntu-gnu-linux-24-04-3.hub ([2407:7000:af23:3e00:f127:785b:6e87:f831]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ccc9d3d2efsm65044975ad.64.2026.07.10.14.23.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jul 2026 14:23:11 -0700 (PDT) From: Jiaxing Hu To: Robin Murphy Cc: Will Deacon , =?UTF-8?q?Heiko=20St=C3=BCbner?= , Joerg Roedel , iommu@lists.linux.dev, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] iommu/rockchip: implement .flush_iotlb_all Date: Sat, 11 Jul 2026 09:23:04 +1200 Message-ID: <20260710212304.11958-1-huhuvmb88@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260710060513.863714-1-huhuvmb88@gmail.com> References: <20260710060513.863714-1-huhuvmb88@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260710_142312_966431_272F5584 X-CRM114-Status: UNSURE ( 8.19 ) X-CRM114-Notice: Please train this message. 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sat, 11 Jul 2026, Robin Murphy wrote: > there's no harm in drivers implementing it *if* they also implement the > relevant optimisations to avoid synchronous flushing in unmap_pages to > make CAP_DEFERRED_FLUSH worthwhile. Understood, thanks. I will drop the standalone patch. If I come back to rk_iommu it will be the full version: move invalidation out of unmap_pages into an iotlb_sync/gather path and advertise CAP_DEFERRED_FLUSH with numbers, rather than flush_iotlb_all on its own. Thanks, Jiaxing