[AMD Official Use Only - General]
> -----Original Message----- > From: Xia, Chenbo <chenbo....@intel.com> > Sent: Tuesday, May 9, 2023 12:25 PM > To: Gupta, Nipun <nipun.gu...@amd.com>; dev@dpdk.org; > tho...@monjalon.net; david.march...@redhat.com > Cc: Yigit, Ferruh <ferruh.yi...@amd.com>; Anand, Harpreet > <harpreet.an...@amd.com>; Agarwal, Nikhil <nikhil.agar...@amd.com> > Subject: RE: [PATCH v4 1/4] bus/cdx: introduce cdx bus > > Caution: This message originated from an External Source. Use proper > caution when opening attachments, clicking links, or responding. > > > > -----Original Message----- > > From: Nipun Gupta <nipun.gu...@amd.com> > > Sent: Monday, May 8, 2023 7:18 PM > > To: dev@dpdk.org; tho...@monjalon.net; david.march...@redhat.com > > Cc: ferruh.yi...@amd.com; harpreet.an...@amd.com; > nikhil.agar...@amd.com; > > Nipun Gupta <nipun.gu...@amd.com> > > Subject: [PATCH v4 1/4] bus/cdx: introduce cdx bus > > > > CDX bus supports multiple type of devices, which can be > > exposed to user-space via vfio-cdx. > > > > vfio-cdx provides the MMIO IO_MEMORY regions as well as the > > DMA interface for the device (IOMMU). > > > > This support aims to enable the DPDK to support the cdx > > devices in user-space using VFIO interface. > > > > Signed-off-by: Nipun Gupta <nipun.gu...@amd.com> > > --- > > MAINTAINERS | 5 + > > doc/guides/rel_notes/release_23_07.rst | 6 + > > drivers/bus/cdx/bus_cdx_driver.h | 201 ++++++++++ > > drivers/bus/cdx/cdx.c | 520 +++++++++++++++++++++++++ > > drivers/bus/cdx/cdx_logs.h | 37 ++ > > drivers/bus/cdx/cdx_vfio.c | 437 +++++++++++++++++++++ > > drivers/bus/cdx/meson.build | 13 + > > drivers/bus/cdx/private.h | 49 +++ > > drivers/bus/cdx/version.map | 11 + > > drivers/bus/meson.build | 1 + > > 10 files changed, 1280 insertions(+) > > create mode 100644 drivers/bus/cdx/bus_cdx_driver.h > > create mode 100644 drivers/bus/cdx/cdx.c > > create mode 100644 drivers/bus/cdx/cdx_logs.h > > create mode 100644 drivers/bus/cdx/cdx_vfio.c > > create mode 100644 drivers/bus/cdx/meson.build > > create mode 100644 drivers/bus/cdx/private.h > > create mode 100644 drivers/bus/cdx/version.map > > > > ... > > > --- /dev/null > > +++ b/drivers/bus/cdx/cdx.c > > @@ -0,0 +1,520 @@ > > +/* SPDX-License-Identifier: BSD-3-Clause > > + * Copyright (C) 2022-2023, Advanced Micro Devices, Inc. > > + */ > > + > > +/* > > + * Architecture Overview > > + * ===================== > > + * CDX is a Hardware Architecture designed for AMD FPGA devices. It > > + * consists of sophisticated mechanism for interaction between FPGA, > > + * Firmware and the APUs (Application CPUs). > > + * > > + * Firmware resides on RPU (Realtime CPUs) which interacts with > > + * the FPGA program manager and the APUs. The RPU provides memory- > mapped > > + * interface (RPU if) which is used to communicate with APUs. > > + * > > + * The diagram below shows an overview of the CDX architecture: > > + * > > + * +--------------------------------------+ > > + * | DPDK | > > + * | DPDK CDX drivers | > > + * | | | > > + * | DPDK CDX bus | > > + * | | | > > + * +-----------------------------|--------+ > > + * | > > + * +-----------------------------|--------+ > > + * | Application CPUs (APU) | | > > + * | | | > > + * | VFIO CDX driver | > > + * | Linux OS | | > > + * | Linux CDX bus | > > + * | | | > > + * +-----------------------------|--------+ > > + * | > > + * | > > + * +------------------------| RPU if |----+ > > + * | | | > > + * | V | > > + * | Realtime CPUs (RPU) | > > + * | | > > + * +--------------------------------------+ > > + * | > > + * +---------------------|----------------+ > > + * | FPGA | | > > + * | +-----------------------+ | > > + * | | | | | > > + * | +-------+ +-------+ +-------+ | > > + * | | dev 1 | | dev 2 | | dev 3 | | > > + * | +-------+ +-------+ +-------+ | > > + * +--------------------------------------+ > > + * > > + * The RPU firmware extracts the device information from the loaded > FPGA > > + * image and implements a mechanism that allows the APU drivers to > > + * enumerate such devices (device personality and resource details) via > > + * a dedicated communication channel. > > What is APU? CPU resources that application uses? Then why cpu resources > that DPDK > Uses are not part of it? Hi Chenbo, APU's are application processor unit and are on-chip CPU's. So in short APUs are CPUs only on which applications like DPDK are running. Thanks, Nipun
