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Thu, 11 Jun 2020 22:29:31 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id C318DC433C8; Thu, 11 Jun 2020 22:29:30 +0000 (UTC) Received: from jordan-laptop.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jcrouse) by smtp.codeaurora.org (Postfix) with ESMTPSA id B7CA5C433CB; Thu, 11 Jun 2020 22:29:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B7CA5C433CB Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=jcrouse@codeaurora.org From: Jordan Crouse To: linux-arm-msm@vger.kernel.org Subject: [PATCH 2/6] iommu/io-pgtable: Allow a pgtable implementation to skip TLB operations Date: Thu, 11 Jun 2020 16:29:17 -0600 Message-Id: <20200611222921.464-3-jcrouse@codeaurora.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200611222921.464-1-jcrouse@codeaurora.org> References: <20200611222921.464-1-jcrouse@codeaurora.org> Cc: Joerg Roedel , Will Deacon , freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Robin Murphy X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Allow a io-pgtable implementation to skip TLB operations by checking for NULL pointers in the helper functions. It will be up to to the owner of the io-pgtable instance to make sure that they independently handle the TLB correctly. Signed-off-by: Jordan Crouse --- include/linux/io-pgtable.h | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h index 53d53c6c2be9..bbed1d3925ba 100644 --- a/include/linux/io-pgtable.h +++ b/include/linux/io-pgtable.h @@ -210,21 +210,24 @@ struct io_pgtable { static inline void io_pgtable_tlb_flush_all(struct io_pgtable *iop) { - iop->cfg.tlb->tlb_flush_all(iop->cookie); + if (iop->cfg.tlb) + iop->cfg.tlb->tlb_flush_all(iop->cookie); } static inline void io_pgtable_tlb_flush_walk(struct io_pgtable *iop, unsigned long iova, size_t size, size_t granule) { - iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie); + if (iop->cfg.tlb) + iop->cfg.tlb->tlb_flush_walk(iova, size, granule, iop->cookie); } static inline void io_pgtable_tlb_flush_leaf(struct io_pgtable *iop, unsigned long iova, size_t size, size_t granule) { - iop->cfg.tlb->tlb_flush_leaf(iova, size, granule, iop->cookie); + if (iop->cfg.tlb) + iop->cfg.tlb->tlb_flush_leaf(iova, size, granule, iop->cookie); } static inline void @@ -232,7 +235,7 @@ io_pgtable_tlb_add_page(struct io_pgtable *iop, struct iommu_iotlb_gather * gather, unsigned long iova, size_t granule) { - if (iop->cfg.tlb->tlb_add_page) + if (iop->cfg.tlb && iop->cfg.tlb->tlb_add_page) iop->cfg.tlb->tlb_add_page(gather, iova, granule, iop->cookie); } -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu