Hi Sunil, > -----Original Message----- > From: sk...@marvell.com <sk...@marvell.com> > Sent: Tuesday, June 28, 2022 9:54 PM > To: Ray Kinsella <m...@ashroe.eu> > Cc: dev@dpdk.org; Sunil Kumar Kori <sk...@marvell.com> > Subject: [PATCH 1/2] doc: announce region based device mapping support > > From: Sunil Kumar Kori <sk...@marvell.com> > > Adding region based device mapping support, which enables pci device > to map only required memory region instead of mapping full BAR.
Why there will be such requirement to mmap only part of BAR when the BAR can be fully mmapped. I thought you want to enable something like sparse mmap feature in VFIO, but seems it's a feature that let driver ask for specific mmap option. Could you explain the use case here? Thanks, Chenbo > > Signed-off-by: Sunil Kumar Kori <sk...@marvell.com> > --- > doc/guides/rel_notes/deprecation.rst | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/doc/guides/rel_notes/deprecation.rst > b/doc/guides/rel_notes/deprecation.rst > index 4e5b23c53d..8800a3eb41 100644 > --- a/doc/guides/rel_notes/deprecation.rst > +++ b/doc/guides/rel_notes/deprecation.rst > @@ -125,3 +125,16 @@ Deprecation Notices > applications should be updated to use the ``dmadev`` library instead, > with the underlying HW-functionality being provided by the ``ioat`` or > ``idxd`` dma drivers > + > +* pci: Update ``rte_pci_device`` and ``rte_pci_driver`` to add region > based > + memory mapping support. There could be a requirement to mmap specific > memory > + region only. Using this mechanism, pci device can be mapped for > + a given BAR at a given offset of given size. > + > + ``rte_pci_device`` will be added with following field > + ``regions[PCI_MAX_RESOURCE][PCI_MAX_REGION_PER_RESOURCE];``. This field > will > + specify the regions which are mapped for a given BAR. > + > + ``rte_pci_driver`` will be added with ``rte_pci_region_map *regions`` > and > + ``valid_bars[PCI_MAX_RESOURCE]``. Using these fields, driver can > propagate > + its region information which are required to be mmap. > -- > 2.25.1
