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[88.18.140.237]) by smtp.gmail.com with ESMTPSA id b15sm3965606wrm.65.2020.10.23.08.19.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2020 08:19:53 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH RESEND v3 06/10] dma: Let dma_memory_read() propagate MemTxResult Date: Fri, 23 Oct 2020 17:19:19 +0200 Message-Id: <20201023151923.3243652-7-philmd@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201023151923.3243652-1-philmd@redhat.com> References: <20201023151923.3243652-1-philmd@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/23 02:46:25 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Edgar E . Iglesias" , Paolo Bonzini , Li Qiang , Richard Henderson , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" dma_memory_rw_relaxed() returns a MemTxResult type. Do not discard it, return it to the caller. Reviewed-by: Richard Henderson Reviewed-by: Li Qiang Reviewed-by: Edgar E. Iglesias Signed-off-by: Philippe Mathieu-Daudé --- include/sysemu/dma.h | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h index 04687d8825e..df170047eb3 100644 --- a/include/sysemu/dma.h +++ b/include/sysemu/dma.h @@ -89,8 +89,9 @@ static inline MemTxResult dma_memory_rw_relaxed(AddressSpace *as, buf, len, dir == DMA_DIRECTION_FROM_DEVICE); } -static inline int dma_memory_read_relaxed(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len) +static inline MemTxResult dma_memory_read_relaxed(AddressSpace *as, + dma_addr_t addr, + void *buf, dma_addr_t len) { return dma_memory_rw_relaxed(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE); } @@ -124,8 +125,20 @@ static inline MemTxResult dma_memory_rw(AddressSpace *as, dma_addr_t addr, return dma_memory_rw_relaxed(as, addr, buf, len, dir); } -static inline int dma_memory_read(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len) +/** + * dma_memory_read: Read from an address space from DMA controller. + * + * Return a MemTxResult indicating whether the operation succeeded + * or failed (eg unassigned memory, device rejected the transaction, + * IOMMU fault). Called within RCU critical section. + * + * @as: #AddressSpace to be accessed + * @addr: address within that address space + * @buf: buffer with the data transferred + * @len: length of the data transferred + */ +static inline MemTxResult dma_memory_read(AddressSpace *as, dma_addr_t addr, + void *buf, dma_addr_t len) { return dma_memory_rw(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE); }