The IOSM (IPC over Shared Memory) driver is a PCIe host driver implemented for linux or chrome platform for data exchange over PCIe interface between Host platform & Intel M.2 Modem. The driver exposes interface conforming to the MBIM protocol [1]. Any front end application ( eg: Modem Manager) could easily manage the MBIM interface to enable data communication towards WWAN. This is the driver we are still working on & below are the known things that need to be addressed by driver. 1. Usage of completion() inside deinit() 2. Clean-up wrappers around hr_timer 3. Usage of net stats inside driver struct Kindly request to review and give your suggestions. Below is the technical detail:- Intel M.2 modem uses 2 BAR regions. The first region is dedicated to Doorbell register for IRQs and the second region is used as scratchpad area for book keeping modem execution stage details along with host system shared memory region context details. The upper edge of the driver exposes the control and data channels for user space application interaction. At lower edge these data and control channels are associated to pipes. The pipes are lowest level interfaces used over PCIe as a logical channel for message exchange. A single channel maps to UL and DL pipe and are initialized on device open. On UL path, driver copies application sent data to SKBs associate it with transfer descriptor and puts it on to ring buffer for DMA transfer. Once information has been updated in shared memory region, host gives a Doorbell to modem to perform DMA and modem uses MSI to communicate back to host. For receiving data in DL path, SKBs are pre-allocated during pipe open and transfer descriptors are given to modem for DMA transfer. The driver exposes two types of ports, namely "wwanctrl", a char device node which is used for MBIM control operation and "INMx",(x = 0,1,2..7) network interfaces for IP data communication. 1) MBIM Control Interface: This node exposes an interface between modem and application using char device exposed by "IOSM" driver to establish and manage the MBIM data communication with PCIe based Intel M.2 Modems. It also support an IOCTL command, apart from read and write methods. The IOCTL command, "IOCTL_WDM_MAX_COMMAND" could be used by applications to fetch the Maximum Command buffer length supported by the driver which is restricted to 4096 bytes. 2) MBIM Data Interface: The IOSM driver represents the MBIM data channel as a single root network device of the "wwan0" type which is mapped as default IP session 0. Several IP sessions(INMx) could be multiplexed over the single data channel using sub devices of master wwanY devices. The driver models such IP sessions as 802.1q VLAN devices which are mapped to a unique VLAN ID. M Chetan Kumar (18): net: iosm: entry point net: iosm: irq handling net: iosm: mmio scratchpad net: iosm: shared memory IPC interface net: iosm: shared memory I/O operations net: iosm: channel configuration net: iosm: char device for FW flash & coredump net: iosm: MBIM control device net: iosm: bottom half net: iosm: multiplex IP sessions net: iosm: encode or decode datagram net: iosm: power management net: iosm: shared memory protocol net: iosm: protocol operations net: iosm: uevent support net: iosm: net driver net: iosm: readme file net: iosm: infrastructure MAINTAINERS | 7 + drivers/net/Kconfig | 1 + drivers/net/Makefile | 1 + drivers/net/wwan/Kconfig | 13 + drivers/net/wwan/Makefile | 5 + drivers/net/wwan/iosm/Kconfig | 10 + drivers/net/wwan/iosm/Makefile | 27 + drivers/net/wwan/iosm/README | 126 +++ drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c | 87 ++ drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.h | 57 + drivers/net/wwan/iosm/iosm_ipc_imem.c | 1466 +++++++++++++++++++++++++ drivers/net/wwan/iosm/iosm_ipc_imem.h | 606 ++++++++++ drivers/net/wwan/iosm/iosm_ipc_imem_ops.c | 779 +++++++++++++ drivers/net/wwan/iosm/iosm_ipc_imem_ops.h | 102 ++ drivers/net/wwan/iosm/iosm_ipc_irq.c | 95 ++ drivers/net/wwan/iosm/iosm_ipc_irq.h | 35 + drivers/net/wwan/iosm/iosm_ipc_mbim.c | 205 ++++ drivers/net/wwan/iosm/iosm_ipc_mbim.h | 24 + drivers/net/wwan/iosm/iosm_ipc_mmio.c | 222 ++++ drivers/net/wwan/iosm/iosm_ipc_mmio.h | 192 ++++ drivers/net/wwan/iosm/iosm_ipc_mux.c | 455 ++++++++ drivers/net/wwan/iosm/iosm_ipc_mux.h | 344 ++++++ drivers/net/wwan/iosm/iosm_ipc_mux_codec.c | 902 +++++++++++++++ drivers/net/wwan/iosm/iosm_ipc_mux_codec.h | 194 ++++ drivers/net/wwan/iosm/iosm_ipc_pcie.c | 494 +++++++++ drivers/net/wwan/iosm/iosm_ipc_pcie.h | 205 ++++ drivers/net/wwan/iosm/iosm_ipc_pm.c | 334 ++++++ drivers/net/wwan/iosm/iosm_ipc_pm.h | 216 ++++ drivers/net/wwan/iosm/iosm_ipc_protocol.c | 287 +++++ drivers/net/wwan/iosm/iosm_ipc_protocol.h | 219 ++++ drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c | 563 ++++++++++ drivers/net/wwan/iosm/iosm_ipc_protocol_ops.h | 358 ++++++ drivers/net/wwan/iosm/iosm_ipc_sio.c | 188 ++++ drivers/net/wwan/iosm/iosm_ipc_sio.h | 72 ++ drivers/net/wwan/iosm/iosm_ipc_task_queue.c | 258 +++++ drivers/net/wwan/iosm/iosm_ipc_task_queue.h | 46 + drivers/net/wwan/iosm/iosm_ipc_uevent.c | 47 + drivers/net/wwan/iosm/iosm_ipc_uevent.h | 41 + drivers/net/wwan/iosm/iosm_ipc_wwan.c | 674 ++++++++++++ drivers/net/wwan/iosm/iosm_ipc_wwan.h | 72 ++ 40 files changed, 10029 insertions(+) create mode 100644 drivers/net/wwan/Kconfig create mode 100644 drivers/net/wwan/Makefile create mode 100644 drivers/net/wwan/iosm/Kconfig create mode 100644 drivers/net/wwan/iosm/Makefile create mode 100644 drivers/net/wwan/iosm/README create mode 100644 drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_chnl_cfg.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_imem.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_imem.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_imem_ops.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_imem_ops.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_irq.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_irq.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mbim.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mbim.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mmio.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mmio.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mux.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mux.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mux_codec.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_mux_codec.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_pcie.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_pcie.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_pm.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_pm.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_protocol.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_protocol.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_protocol_ops.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_sio.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_sio.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_task_queue.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_task_queue.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_uevent.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_uevent.h create mode 100644 drivers/net/wwan/iosm/iosm_ipc_wwan.c create mode 100644 drivers/net/wwan/iosm/iosm_ipc_wwan.h -- 2.12.3
