Qualcomm Kernel » History » Revision 11
Revision 10 (laforge, 12/18/2016 12:39 PM) → Revision 11/22 (laforge, 12/19/2016 03:15 PM)
{{>toc}} h1. Qualcomm Kernel Random notes about the Qualcomm Kernel as used on the MDM9615 h2. diag h3. diag forwarding <pre> drivers/char/diag/diagfwd.[ch] drivers/usb/gadget/f_diag.[ch] drivers/usb/misc/diag_bridge.c </pre> * the usb diag gadget handles diag packet read/write over usb * issues events like USB_DIAG_READ_DONE * picked up by diagfwd.c ** can forward diag requests via SMD shared memory to other processors h3. diag char The kernel exports a /dev/diag char device which userspce processes can use to register/listen for DIAG events from the system, or actually register a DIAG 'subsystem' themselves which can then be controlled from QXDM. <pre> drivers/char/diag/diagchar_core.c </pre> * ioctl()s for diag configuration * supports several concurrent diag clients * diag logging can be directed to USB/HSIC, character device and more ** {USB,CALLBACK,MEMORY_DEVICE,UART,NO_LOGGING}_MODE drivers/char/diag/diag_dci.c * DCI table is a routing table where pid/sockets can register for a given DCI. socket close/cleanup code releases all DCI routes for that socket. h4. DIAG_IOCTL_COMMAND_REG * Register a new DIAG command so it can be used from the outside world (QXDM) * use 'struct diag_cmd_reg_entry_t' per command * driver keeps a driver->cmd_reg_list of registered commands h4. DIAG_IOCTL_COMMAND_DEREG * unregister debug command h4. DIAG_IOCTL_GET_DELAYED_RSP_ID h4. DIAG_IOCTL_DCI_REG h4. DIAG_IOCTL_DCI_DEINIT h4. DIAG_IOCTL_DCI_SUPPORT h4. DIAG_IOCTL_DCI_HEALTH_STATS h4. DIAG_IOCTL_DCI_LOG_STATUS h4. DIAG_IOCTL_DCI_EVENT_STATUS h4. DIAG_IOCTL_DCI_CLEAR_LOGS h4. DIAG_IOCTL_DCI_CLEAR_EVENTS h4. DIAG_IOCTL_LSM_DEINIT h4. DIAG_IOCTL_SWITCH_LOGGING * switch between USB and shared-memory diag * h4. DIAG_IOCTL_REMOTE_DEV h4. DIAG_IOCTL_VOTE_REAL_TIME h4. DIAG_IOCTL_GET_REAL_TIME h4. DIAG_IOCTL_PERIPHERAL_BUF_CONFIG h4. DIAG_IOCTL_PERIPHERAL_BUF_DRAIN h4. DIAG_IOCTL_REGISTER_CALLBACK * doen't really do anything but checking arguments ?!? h4. DIAG_IOCTL_HDLC_TOGGLE enable or disable HDLC framing of /dev/diag h2. SMD (shared memory) * SMD sub-systems: ** Modem (assumed to be hexagon with modem firmware?) ** Q6 (formerly known as LPASS == Low Power Audio SubSystem) ** DSPS ** WCNSS (Wireless Connectivity Sub System) aka 'riva' ** RPM (Resource Power Manager) * inter-processor-interrupts for various 'edges' h3. core driver * arch/arm/mach-msm/smd.c h4. api * smd_open() * smd_close() * smd_write*() * smd_read*() * smsm_*() h3. MSM IPC socket * arch/arm/mach-msm/ipc_socket.c * AF_MSM_IPC h3. packet ports * Some kind of packet oriented interface towards the SMD * msm_smd_pkt.c contains driver ** smdpkt0..7+smd22 devices, 2048 byte buffer ** open/release/read/write/poll syscalls implemented h3. available SMD devices From an EC25: <pre> Primary allocation table: root@mdm9607-perf:~# cat /sys/kernel/debug/smd/ch ID|CHANNEL NAME |T|PROC |STATE |FIFO SZ|RDPTR |WRPTR |FLAGS |DATAPEN ------------------------------------------------------------------------------- 4|rpm_requests |P|APPS |OPENED |0x00400|0x001E0|0x001E0|DCCiwRsB|0x00000 | | |RPM |OPENED |0x00400|0x00118|0x00118|DCCiwrsB|0x00000 ------------------------------------------------------------------------------- 5|rpm_requests |P|MDMSW| Access Restricted | | |RPM | Access Restricted ------------------------------------------------------------------------------- 6|rpm_requests |P|WCNSS| Access Restricted | | |RPM | Access Restricted ------------------------------------------------------------------------------- 7|rpm_requests |P|TZ | Access Restricted | | |RPM | Access Restricted ------------------------------------------------------------------------------- 8|rpm_requests |P|ADSP | Access Restricted | | |RPM | Access Restricted ------------------------------------------------------------------------------- APPS <-> MDMSW Primary allocation table: ID|CHANNEL NAME |T|PROC |STATE |FIFO SZ|RDPTR |WRPTR |FLAGS |DATAPEN ------------------------------------------------------------------------------- 0|DS |S|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000 | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 ------------------------------------------------------------------------------- 1|IPCRTR |P|APPS |OPENED |0x02000|0x012E4|0x012E4|DCCiwrsB|0x00000 | | |MDMSW|OPENED |0x02000|0x011F8|0x011F8|DCCiwrsB|0x00000 ------------------------------------------------------------------------------- 2|SSM_RTR_MODEM_APPS |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 | | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000 ------------------------------------------------------------------------------- 3|DIAG_2_CMD |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 ------------------------------------------------------------------------------- 4|DIAG_2 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 ------------------------------------------------------------------------------- 5|DIAG_CNTL |P|APPS |OPENED |0x02000|0x00062|0x00062|DCCiwrsb|0x00000 | | |MDMSW|OPENED |0x02000|0x007F5|0x007F5|DCCiwrsB|0x00000 ------------------------------------------------------------------------------- 6|DIAG_CMD |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 ------------------------------------------------------------------------------- 7|DIAG |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 | | |MDMSW|OPENED |0x02000|0x00026|0x00026|DCCiwrsB|0x00000 ------------------------------------------------------------------------------- 8|apr_audio_svc |P|APPS |OPENED |0x02000|0x002F0|0x002F0|DCCiwrsB|0x00000 | | |MDMSW|OPENED |0x02000|0x00248|0x00248|DCCiwrsB|0x00000 ------------------------------------------------------------------------------- 9|apr_apps2 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 | | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000 ------------------------------------------------------------------------------- 10|DATA1 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 ------------------------------------------------------------------------------- 11|DATA2 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 | | |MDMSW|OPENING|0x02000|0x00000|0x00000|dCciwrSb|0x00000 ------------------------------------------------------------------------------- 12|DATA3 |P|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000 | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 ------------------------------------------------------------------------------- 13|DATA4 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 ------------------------------------------------------------------------------- 14|DATA11 |S|APPS |OPENED |0x02000|0x00089|0x00089|dcCiwRsb|0x00000 | | |MDMSW|OPENED |0x02000|0x0012B|0x0012B|dCciwrsB|0x00000 ------------------------------------------------------------------------------- 15|DATA40 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 | | |MDMSW|OPENING|0x02000|0x00000|0x00000|dcciwrSb|0x00000 ------------------------------------------------------------------------------- 16|DATA5_CNTL |P|APPS |CLOSED |0x00400|0x00000|0x00000|dcciwrsb|0x00000 | | |MDMSW|OPENING|0x00400|0x00000|0x00000|DCCiwrSb|0x00000 ------------------------------------------------------------------------------- 17|DATA40_CNTL |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 | | |MDMSW|OPENED |0x02000|0x00100|0x00100|DCCiwrsB|0x00000 ------------------------------------------------------------------------------- </pre> h2. smem_log This is some kidn of high speed shared memory based event log to which all processors can log events. Userspace applications can use write() to @/dev/smem_log@ to add log entries. Qualcomm uses a proprietary minimal shim layer offering SMEM_LOG_EVENT and SMEM_LOG_EVENT6 macros that can be used to write events with an event ID plus three data words or six data words, respectively. The shared memory log can be read from linux userspace via debugfs, see the devices in @/sys/kernel/debug/smem_log@ and simply use @cat@ on them. You will get lines like <pre> MODM: 3982377401 000d0000: 00000001: 03000019 01000028 01000015 53505041 00000061 5f696d71 MODM: 3982378159 QCSI: 00000004: 00040029 00240015 00000003 00000001 0000002b 00000000 MODM: 3982378619 000d0000: 00000001: 03000019 0100002b 01000015 53505041 00000061 5f696d71 APPS: 3982397356 QCCI: 00000005: 0004001d 0024000e 00000003 00000003 00000019 00000000 APPS: 3982400571 QCCI: 00000005: 00040029 0024000e 00000003 00000003 00000019 00000000 MODM: 1841235211 QCSI: 00000004: 0004001e 0024001c 00000003 00000001 00000028 00000000 MODM: 1841236665 000d0000: 00000001: 03000019 01000028 0101001c 53505041 00000061 5f696d71 MODM: 1841241411 QCSI: 00000004: 0004002a 0024001c 00000003 00000001 0000002b 00000000 MODM: 1841242246 000d0000: 00000001: 03000019 0100002b 0100001c 53505041 00000061 5f696d71 MODM: 1841243796 QCSI: 00000004: 0004002b 00660019 00000003 00000001 0000002b 00000000 MODM: 1841244286 000d0000: 00000001: 03000019 0100002b 01000019 53505041 00000061 5f696d71 APPS: 1841255456 QCCI: 00000005: 0004001e 00240015 00000003 00000003 00000019 00000000 MODM: 1841255335 000d0000: 00000002: 0100ffff 0300ffff 07000014 53505041 0000016c 74646d73 MODM: 1841255828 000d0000: 00000702: 00000001 00000028 00000007 APPS: 1841261430 QCCI: 00000005: 0004002a 00240015 00000003 00000003 00000019 00000000 </pre> h2. rmnet "remote network" ? * consists of control channel and data channel * data channel carries IP data * control channel carries QMI messages * drivers/net/ethernet/msm/msm_rmnet_bam.c ** ioctl() to set ethernet or rawip (RMNET_IOCTL_SET_LLP_ETHERNET, RMNET_IOCTL_SET_LLP_IP, RMNET_IOCTL_GET_LLP), initial boot time config is ETHERNET ** use msm_bam_dmux_open() to attach ** use RMNET_IOCTL_GET_EPID to get the BAM_DMUX endpoint id h2. bam (Bus Access Manager/Module) * The Bus Access Manager/Module (BAM) can be considered as a distributed data mover (DM) * some kind of DMA controller/engine * A number of the on-chip devices have their own BAM DMA controller and use it to move data between system memory and peripherals or between two peripherals. Files: <pre> ./drivers/dma/qcom_bam_dma.c ./drivers/net/ethernet/msm/msm_rmnet_bam.c ./drivers/platform/msm/sps/bam.c ./drivers/platform/msm/sps/sps_bam.c ./drivers/platform/msm/usb_bam.c </pre> * channels (BAM_DMUX_) ** RMNET_0...7 ** USB_RMNET_0 ** DATA_REV_RMNET_0..8 ** USB_DPL seem to be be based on dmux ./drivers/soc/qcom/bam_dmux.c h2. IPA (Internet Packet Accelerator) Internet Packet Accelerator (IPA) is a programmable protocol processor HW block. It is designed to support generic HW processing of UL/DL IP packets for various use cases independent of radio technology. See drivers/platform/msm/ipa/ http://www.sumobrain.com/patents/wipo/Accelerator/WO2013063791A1.pdf h2. bam2bam maybe soem kind of direct connection between two peripherals by means of the BAM? h2. Android USB Gadget see [[Android_USB_Gadget]] h2. IPC Logging see [[IPC_Logging]]