| Message ID | 20241004050742.140664-6-dlemoal@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | Improve PCI memory mapping API | expand |
On Fri, Oct 04, 2024 at 02:07:40PM +0900, Damien Le Moal wrote: > 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@kernel.org> > --- > Documentation/PCI/endpoint/pci-endpoint.rst | 33 +++++++++++++++++++++ > 1 file changed, 33 insertions(+) > > diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst > index 21507e3cc238..80061110441d 100644 > --- a/Documentation/PCI/endpoint/pci-endpoint.rst > +++ b/Documentation/PCI/endpoint/pci-endpoint.rst > @@ -117,6 +117,39 @@ 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() > + > + The PCI endpoint controller may impose constraints on the RC PCI addresses > + that can be mapped. The function pci_epc_map_align() allows endpoint drivers > + to discover and handle such constraint by providing the size of the memory Nit: s/constraint/constraints/ > + that must be allocated with pci_epc_mem_alloc_addr() for successfully mapping > + any RC PCI address. This function will also indicate the offset into the > + allocated memory to use for accessing the target RC PCI address. Should probably also mention that it might map less memory than requested. > + > +* 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 endpoitn function drivers. s/endpoitn/endpoint/ > + > +* 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 > I think that it would make more sense if you squashed the doc updates for each function into the respective commit that add the new function(s). Sure, you would still need a commit that adds the documentation for the functions that was missing, but that is expected. Regardless: Reviewed-by: Niklas Cassel <cassel@kernel.org>
diff --git a/Documentation/PCI/endpoint/pci-endpoint.rst b/Documentation/PCI/endpoint/pci-endpoint.rst index 21507e3cc238..80061110441d 100644 --- a/Documentation/PCI/endpoint/pci-endpoint.rst +++ b/Documentation/PCI/endpoint/pci-endpoint.rst @@ -117,6 +117,39 @@ 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() + + The PCI endpoint controller may impose constraints on the RC PCI addresses + that can be mapped. The function pci_epc_map_align() allows endpoint drivers + to discover and handle such constraint 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 offset into the + allocated memory to use for accessing the target RC PCI address. + +* 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 endpoitn 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 ~~~~~~~~~~~~~~
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@kernel.org> --- Documentation/PCI/endpoint/pci-endpoint.rst | 33 +++++++++++++++++++++ 1 file changed, 33 insertions(+)