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[RESEND,v2,05/16] dma: Let dma_memory_rw() propagate MemTxResult

Message ID 20201001172519.1620782-6-philmd@redhat.com
State Superseded
Headers show
Series hw: Let DMA/PCI API take MemTxAttrs argument and propagate MemTxResult | expand

Commit Message

Philippe Mathieu-Daudé Oct. 1, 2020, 5:25 p.m. UTC 
address_space_rw() returns a MemTxResult type.
Do not discard it, return it to the caller.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/sysemu/dma.h | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)
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Patch

diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index 37cd9f1121..04687d8825 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -80,12 +80,13 @@  static inline bool dma_memory_valid(AddressSpace *as,
                                       MEMTXATTRS_UNSPECIFIED);
 }
 
-static inline int dma_memory_rw_relaxed(AddressSpace *as, dma_addr_t addr,
-                                        void *buf, dma_addr_t len,
-                                        DMADirection dir)
+static inline MemTxResult dma_memory_rw_relaxed(AddressSpace *as,
+                                                dma_addr_t addr,
+                                                void *buf, dma_addr_t len,
+                                                DMADirection dir)
 {
-    return (bool)address_space_rw(as, addr, MEMTXATTRS_UNSPECIFIED,
-                                  buf, len, dir == DMA_DIRECTION_FROM_DEVICE);
+    return address_space_rw(as, addr, MEMTXATTRS_UNSPECIFIED,
+                            buf, len, dir == DMA_DIRECTION_FROM_DEVICE);
 }
 
 static inline int dma_memory_read_relaxed(AddressSpace *as, dma_addr_t addr,
@@ -101,9 +102,22 @@  static inline int dma_memory_write_relaxed(AddressSpace *as, dma_addr_t addr,
                                  DMA_DIRECTION_FROM_DEVICE);
 }
 
-static inline int dma_memory_rw(AddressSpace *as, dma_addr_t addr,
-                                void *buf, dma_addr_t len,
-                                DMADirection dir)
+/**
+ * dma_memory_rw: Read from or write to 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).
+ *
+ * @as: #AddressSpace to be accessed
+ * @addr: address within that address space
+ * @buf: buffer with the data transferred
+ * @len: the number of bytes to read or write
+ * @dir: indicates the transfer direction
+ */
+static inline MemTxResult dma_memory_rw(AddressSpace *as, dma_addr_t addr,
+                                        void *buf, dma_addr_t len,
+                                        DMADirection dir)
 {
     dma_barrier(as, dir);