Document the new functions pci_epc_map_align(), pci_epc_mem_map() and
pci_epc_mem_unmap(). Also add the documentation for the functions
pci_epc_map_addr() and pci_epc_unmap_addr() that were missing.
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Reviewed-by: Niklas Cassel <cassel@xxxxxxxxxx>
---
Documentation/PCI/endpoint/pci-endpoint.rst | 35 +++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst
index 21507e3cc238..8e86cd209f9a 100644
--- a/Documentation/PCI/endpoint/pci-endpoint.rst
+++ b/Documentation/PCI/endpoint/pci-endpoint.rst
@@ -117,6 +117,41 @@ by the PCI endpoint function driver.
The PCI endpoint function driver should use pci_epc_mem_free_addr() to
free the memory space allocated using pci_epc_mem_alloc_addr().
+* pci_epc_map_align()
+
+ A PCI endpoint controller may impose constraints on the RC PCI addresses
+ that can be mapped. The function pci_epc_map_align() allows endpoint
+ function drivers to discover and handle such constraints by providing the
+ size of the memory that must be allocated with pci_epc_mem_alloc_addr()
+ for successfully mapping any RC PCI address. This function will also
+ indicate the size of the PCI address range that can be mapped, which can be
+ less than the requested size, as well as the offset into the allocated
+ memory to use for accessing the RC PCI address range that can be mapped.
+
+* pci_epc_map_addr()
+
+ A PCI endpoint function driver should use pci_epc_map_addr() to map to a RC
+ PCI address the CPU address of local memory obtained with
+ pci_epc_mem_alloc_addr().
+
+* pci_epc_unmap_addr()
+
+ A PCI endpoint function driver should use pci_epc_unmap_addr() to unmap the
+ CPU address of local memory mapped to a RC address with pci_epc_map_addr().
+
+* pci_epc_mem_map()
+
+ A PCI endpoint function driver can use pci_epc_mem_map() to allocate and map
+ a RC PCI address range. This function combines calls to pci_epc_map_align(),
+ pci_epc_mem_alloc_addr() and pci_epc_mem_alloc_addr() into a single function
+ to simplify the PCI address mapping handling in endpoint function drivers.
+
+* pci_epc_mem_unmap()
+
+ A PCI endpoint function driver can use pci_epc_mem_unmap() to unmap and free
+ memory that was allocated and mapped using pci_epc_mem_map().
+
+
Other EPC APIs
~~~~~~~~~~~~~~
--
2.46.2
