diff mbox series

[v3,04/10] hw/pci: Document pci_dma_map()

Message ID 20220111184309.28637-5-f4bug@amsat.org
State New
Headers show
Series hw/dma: Use dma_addr_t type definition when relevant | expand

Commit Message

Philippe Mathieu-Daudé Jan. 11, 2022, 6:43 p.m. UTC 
From: Philippe Mathieu-Daudé <philmd@redhat.com>

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 include/hw/pci/pci.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 483d5c7c727..023abc0f791 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -881,6 +881,18 @@  PCI_DMA_DEFINE_LDST(q_be, q_be, 64);
 
 #undef PCI_DMA_DEFINE_LDST
 
+/**
+ * pci_dma_map: Map device PCI address space range into host virtual address
+ * @dev: #PCIDevice to be accessed
+ * @addr: address within that device's address space
+ * @plen: pointer to length of buffer; updated on return to indicate
+ *        if only a subset of the requested range has been mapped
+ * @dir: indicates the transfer direction
+ *
+ * Return: A host pointer, or %NULL if the resources needed to
+ *         perform the mapping are exhausted (in that case *@plen
+ *         is set to zero).
+ */
 static inline void *pci_dma_map(PCIDevice *dev, dma_addr_t addr,
                                 dma_addr_t *plen, DMADirection dir)
 {