dma: Let dma_memory_read() propagate MemTxResult
dma_memory_rw_relaxed() 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>
Message-Id: <20201023151923.3243652-7-philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h
index 04687d8..df17004 100644
--- a/include/sysemu/dma.h
+++ b/include/sysemu/dma.h
@@ -89,8 +89,9 @@
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 @@
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);
}
