Changes since v2: - Reordered the ntb_test link patch per Allen - Removed an extra call to switchtec_ntb_init_mw - Fixed a typo in the switchtec.txt documentation. -- Changes since v1: - Rebased onto latest ntb-next branch (with v4.13-rc1) - Reworked ntb_mw_count() function so that it can be called all the time (per discussion with Allen) - Various spelling and formatting cleanups from Bjorn - Added request_module() call such that the NTB module is automatically loaded when appropriate hardware exists. -- Changes since the rfc: - Rebased on ntb-next - Switched ntb_part_op to use sleep instead of delay - Dropped a number of useless dbg __func__ prints - Went back to the dynamic instead of the static class - Swapped the notifier block for a simple callback - Modified the new ntb api so that a couple functions with pidx now must be called after link up. Per our discussion on the list. -- This patchset implements Non-Transparent Bridge (NTB) support for the Microsemi Switchtec series of switches. We're looking for some review from the community at this point but hope to get it upstreamed for v4.14. Switchtec NTB support is configured over the same function and bar as the management endpoint. Thus, the new driver hooks into the management driver which we had merged in v4.12. We use the class interface API to register an NTB device for every switchtec device which supports NTB (not all do). The Switchtec hardware supports doorbells, memory windows and messages. Seeing there is no native scratchpad support, 128 spads are emulated through the use of a pre-setup memory window. The switch has 64 doorbells which are shared between the two partitions and a configurable set of memory windows. While the hardware supports more than 2 partitions, this driver only supports the first two seeing the current NTB API only supports two hosts. The driver has been tested with ntb_netdev and fully passes the ntb_test script. This patchset is based off of ntb-next and can be found in this git repo: https://github.com/sbates130272/linux-p2pmem.git switchtec_ntb_v3 *** BLURB HERE *** Logan Gunthorpe (16): switchtec: move structure definitions into a common header switchtec: export class symbol for use in upper layer driver switchtec: add NTB hardware register definitions switchtec: add link event notifier callback ntb: ntb_test: ensure the link is up before trying to configure the mws ntb: ensure ntb_mw_get_align() is only called when the link is up ntb: add check and comment for link up to mw_count() and mw_get_align() switchtec_ntb: introduce initial NTB driver switchtec_ntb: initialize hardware for memory windows switchtec_ntb: initialize hardware for doorbells and messages switchtec_ntb: add skeleton NTB driver switchtec_ntb: add link management switchtec_ntb: implement doorbell registers switchtec_ntb: implement scratchpad registers switchtec_ntb: add memory window support switchtec_ntb: update switchtec documentation with notes for NTB Documentation/switchtec.txt | 12 + MAINTAINERS | 2 + drivers/ntb/hw/Kconfig | 1 + drivers/ntb/hw/Makefile | 1 + drivers/ntb/hw/mscc/Kconfig | 9 + drivers/ntb/hw/mscc/Makefile | 1 + drivers/ntb/hw/mscc/switchtec_ntb.c | 1211 +++++++++++++++++++++++++++++++ drivers/ntb/ntb_transport.c | 20 +- drivers/ntb/test/ntb_perf.c | 18 +- drivers/ntb/test/ntb_tool.c | 6 +- drivers/pci/switch/switchtec.c | 316 ++------ include/linux/ntb.h | 11 +- include/linux/switchtec.h | 373 ++++++++++ tools/testing/selftests/ntb/ntb_test.sh | 4 + 14 files changed, 1702 insertions(+), 283 deletions(-) create mode 100644 drivers/ntb/hw/mscc/Kconfig create mode 100644 drivers/ntb/hw/mscc/Makefile create mode 100644 drivers/ntb/hw/mscc/switchtec_ntb.c create mode 100644 include/linux/switchtec.h -- 2.11.0
