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laforge, 12/26/2016 07:44 PM
- Table of contents
- Qualcomm Linux SMD (Shared Memory Device)
Qualcomm Linux SMD (Shared Memory Device)¶
Individual processors / sub-systems in a multi-CPU SOC provide SMD channels. This is basically a pipe abstraction over a shared memory protocol. Each channel exists between two given CPU cores, so called SMD sub-systems.
- SMD sub-systems we know of:
- APPS (applications processor, this is the Linux system)
- 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'
In the MDM9615/9x07 based devices it seems there is only the RPM, MODEM and APPS.
core driver¶
- arch/arm/mach-msm/smd.c
api¶
- smd_open()
- smd_close()
- smd_write*()
- smd_read*()
- smsm_*()
SMD based drivers¶
smd_tty¶
Seems to expose tty devices (/dev/smdN) bound to SMD channels.
smd_nmea¶
Exposes a tty device (/dev/nmea) bound to a SMD channel named "GPSNMEA".
diagfwd¶
DIAG forwarding, see DIAG
u_smd usb gadget¶
Used to forward data of certain USB endpoints towards other processors (mainly MDSP)
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
MSM IPC (Inter Process Communications) socket¶
Qualcomm implements a socket-based inter process communication on Linux. It is implemented using a new address family, AF_MSM_IPC (27).
The socket is used as datagram type socket (SOCK_DGRAM).
The socket address of a related socket consists of:
- the socket family (AF_MSM_IPC)
- a
struct msm_ipc_addr, consisting of- a single address type byte
- a port address (node_id, port_id)
- a port name (service, instance)
- arch/arm/mach-msm/ipc_socket.c
- AF_MSM_IPC
available SMD pipes¶
SMD pipes on an EC25¶
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 -------------------------------------------------------------------------------
SMD pipes on an EC20:¶
/sys/kernel/debug/smd # cat ch ch00: OPENED(0000/0000) dcCiwrsb <-> OPENED(0000/0000) dCciwrsB : 2000 ch04: OPENED(27336/27336) DCCiwrsB <-> OPENED(6552/6552) DCCiwrsB : 8000 ch05: OPENED(0000/0000) DCCiwrsb <-> OPENED(12568/12568) DCCiwrsB : 10000 ch06: OPENED(1872/1872) DCCiwrsB <-> OPENED(0216/0216) DCCiwrsB : 2000 ch07: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 ch08: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 400 ch09: OPENED(0952/0952) DCCiwrsb <-> OPENED(0438/0438) DCCiwrsB : 400 ch10: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 ch11: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 ch12: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 ch13: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 ch14: OPENED(0480/0480) DCCiwrsB <-> OPENED(0376/0376) DCCiwrsB : 400 ch15: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 ch16: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 ch17: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 400 ch18: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 ch19: OPENED(0952/0952) DCCiwrsb <-> OPENED(0370/0370) DCCiwrsB : 400 ch20: OPENED(0021/0021) DCCiwrsb <-> OPENED(0078/0078) DCCiwrsB : 2000 ch21: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 ch22: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 ch23: OPENED(0000/0000) dcCiwrsb <-> OPENED(0000/0000) dCciwrsB : 2000 ch24: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) dCciwrsb : 2000 ch25: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 ch26: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 ch27: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dcciwrSb : 2000 ch28: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsB : 2000 ch29: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dcciwrSb : 2000 ch30: OPENED(0295/0295) DCCiwrsB <-> OPENED(0563/0563) DCCiwrsB : 400 ch31: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 ch32: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 ch33: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 ch34: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) dCciwrsb : 2000
/sys/kernel/debug/smd # cat tbl name=DS cid=0 ch type=0 xfer type=1 ref_count=2 name= cid=0 ch type=0 xfer type=0 ref_count=0 name= cid=0 ch type=0 xfer type=0 ref_count=0 name= cid=0 ch type=0 xfer type=0 ref_count=0 name=MSGR_SMD_P1 cid=4 ch type=11 xfer type=2 ref_count=2 name=MSGR_SMD_P0 cid=5 ch type=11 xfer type=2 ref_count=2 name=IPCRTR cid=6 ch type=1 xfer type=2 ref_count=1 name=IPCRTR cid=7 ch type=2 xfer type=2 ref_count=1 name=sys_mon cid=8 ch type=1 xfer type=2 ref_count=1 name=DIAG_CNTL cid=9 ch type=1 xfer type=2 ref_count=2 name=DIAG cid=10 ch type=1 xfer type=2 ref_count=2 name=apr_audio_svc cid=11 ch type=1 xfer type=2 ref_count=1 name=apr_voice_svc cid=12 ch type=2 xfer type=2 ref_count=2 name=apr_apps2 cid=13 ch type=1 xfer type=2 ref_count=1 name=RPCRPY_CNTL cid=14 ch type=0 xfer type=2 ref_count=2 name=IPCROUTER cid=15 ch type=0 xfer type=0 ref_count=1 name=SSM_RTR cid=16 ch type=0 xfer type=2 ref_count=1 name=sys_mon cid=17 ch type=0 xfer type=2 ref_count=1 name=DIAG_2 cid=18 ch type=0 xfer type=2 ref_count=2 name=DIAG_CNTL cid=19 ch type=0 xfer type=2 ref_count=2 name=DIAG cid=20 ch type=0 xfer type=2 ref_count=2 name=apr_voice_svc cid=21 ch type=0 xfer type=2 ref_count=1 name=DATA1 cid=22 ch type=0 xfer type=2 ref_count=2 name=DATA2 cid=23 ch type=0 xfer type=2 ref_count=2 name=DATA3 cid=24 ch type=0 xfer type=2 ref_count=2 name=DATA4 cid=25 ch type=0 xfer type=2 ref_count=2 name=DATA11 cid=26 ch type=0 xfer type=1 ref_count=2 name=DATA40 cid=27 ch type=0 xfer type=2 ref_count=2 name=DATA40_CNTL cid=28 ch type=0 xfer type=2 ref_count=2 name=DATA8 cid=29 ch type=0 xfer type=2 ref_count=2 name=DATA5_CNTL cid=30 ch type=0 xfer type=2 ref_count=2 name=DATA6_CNTL cid=31 ch type=0 xfer type=2 ref_count=2 name=DATA7_CNTL cid=32 ch type=0 xfer type=2 ref_count=2 name=DATA8_CNTL cid=33 ch type=0 xfer type=2 ref_count=2 name=GPSNMEA cid=34 ch type=0 xfer type=2 ref_count=2
Updated by laforge over 7 years ago · 3 revisions
