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Mon, 31 Aug 2020 11:49:26 -0700 (PDT) Received: from LeoBras.ibmuc.com ([2804:14d:8084:8e41:9b0d:571e:a65:b5d8]) by smtp.gmail.com with ESMTPSA id s17sm11779070qte.50.2020.08.31.11.49.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Aug 2020 11:49:26 -0700 (PDT) From: Leonardo Bras To: Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Leonardo Bras , Joel Stanley , Christophe Leroy , Nayna Jain , Eric Richter , Nicholas Piggin , Hari Bathini , Masahiro Yamada , Brian King , Murilo Fossa Vicentini , David Dai , Matthew Wilcox Subject: [RFC PATCH 1/2] dma-direction: Add DMA_DIR_COMPAT() macro to test direction compability Date: Mon, 31 Aug 2020 15:48:58 -0300 Message-Id: <20200831184859.110660-2-leobras.c@gmail.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200831184859.110660-1-leobras.c@gmail.com> References: <20200831184859.110660-1-leobras.c@gmail.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Given a existing mapping with 'current' direction, and a 'wanted' direction for using that mapping, check if 'wanted' is satisfied by 'current'. current accepts DMA_BIDIRECTIONAL DMA_BIDIRECTIONAL, DMA_TO_DEVICE, DMA_FROM_DEVICE, DMA_NONE DMA_TO_DEVICE DMA_TO_DEVICE, DMA_NONE DMA_FROM_DEVICE DMA_FROM_DEVICE, DMA_NONE DMA_NONE DMA_NONE This macro is useful for checking if a DMA mapping can be reused. Signed-off-by: Leonardo Bras --- include/linux/dma-direction.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/dma-direction.h b/include/linux/dma-direction.h index 9c96e30e6a0b..caf3943a21f4 100644 --- a/include/linux/dma-direction.h +++ b/include/linux/dma-direction.h @@ -9,4 +9,7 @@ enum dma_data_direction { DMA_NONE = 3, }; +/* Checks if wanted direction is satisfied by current mapping direction*/ +#define DMA_DIR_COMPAT(current, wanted) (((current) & ~(wanted)) == 0) + #endif