On Tue, Jun 12, 2018 at 5:10 AM, Wu Hao <hao.wu@xxxxxxxxx> wrote: > Device Feature List (DFL) defines a feature list structure that creates > a link list of feature headers within the MMIO space to provide an > extensible way of adding features. This patch introduces a kernel module > to provide basic infrastructure to support FPGA devices which implement > the Device Feature List. > > Usually there will be different features and their sub features linked into > the DFL. This code provides common APIs for feature enumeration, it creates > a container device (FPGA base region), walks through the DFLs and creates > platform devices for feature devices (Currently it only supports two > different feature devices, FPGA Management Engine (FME) and Port which > the Accelerator Function Unit (AFU) connected to). In order to enumerate > the DFLs, the common APIs required low level driver to provide necessary > enumeration information (e.g address for each device feature list for > given device) and fill it to the dfl_fpga_enum_info data structure. Please > refer to below description for APIs added for enumeration. > > Functions for enumeration information preparation: > *dfl_fpga_enum_info_alloc > allocate enumeration information data structure. > > *dfl_fpga_enum_info_add_dfl > add a device feature list to dfl_fpga_enum_info data structure. > > *dfl_fpga_enum_info_free > free dfl_fpga_enum_info data structure and related resources. > > Functions for feature device enumeration: > *dfl_fpga_feature_devs_enumerate > enumerate feature devices and return container device. > > *dfl_fpga_feature_devs_remove > remove feature devices under given container device. > > Signed-off-by: Tim Whisonant <tim.whisonant@xxxxxxxxx> > Signed-off-by: Enno Luebbers <enno.luebbers@xxxxxxxxx> > Signed-off-by: Shiva Rao <shiva.rao@xxxxxxxxx> > Signed-off-by: Christopher Rauer <christopher.rauer@xxxxxxxxx> > Signed-off-by: Zhang Yi <yi.z.zhang@xxxxxxxxx> > Signed-off-by: Xiao Guangrong <guangrong.xiao@xxxxxxxxxxxxxxx> > Signed-off-by: Wu Hao <hao.wu@xxxxxxxxx> Acked-by: Alan Tull <atull@xxxxxxxxxx> > --- > v3: split from another patch. > separate dfl enumeration code from original pcie driver. > provide common data structures and APIs for enumeration. > update device feature list parsing process according to latest hw. > add dperf/iperf/hssi sub feature placeholder according to latest hw. > remove build_info_add_sub_feature and other small functions. > replace *_feature_num function with macro. > remove writeq/readq. > v4: fix SPDX license issue > rename files to dfl.[ch], fix typo and add more comments. > remove static feature_info tables for FME and Port. > remove check on next_afu link list as only FIU has next_afu ptr. > remove unused macro in header file. > add more comments for functions. > v5: add "dfl_" prefix to functions and data structures. > remove port related functions from DFL framework. > use BIT_ULL for 64bit register definition. > save dfl_fpga_cdev in pdata for feature platform devices. > rebase due to fpga region api changes. > v6: update time in copyright and improve function name. > introduce dfl_devs table to save feature device info. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
