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Qualcomm Linux SMD » History » Version 9

laforge, 12/26/2016 08:40 PM

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h1. Qualcomm Linux SMD (Shared Memory Device)
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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_.
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* SMD sub-systems we know of:
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** APPS (applications processor, this is the Linux system)
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** Modem (assumed to be hexagon with modem firmware?)
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** Q6 (formerly known as LPASS == Low Power Audio SubSystem)
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** DSPS
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** WCNSS (Wireless Connectivity Sub System) aka 'riva'
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** RPM (Resource Power Manager)
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* inter-processor-interrupts for various 'edges'
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In the MDM9615/9x07 based devices it seems there is only the RPM, MODEM and APPS.
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h2. core driver
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* arch/arm/mach-msm/smd.c
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h3. api
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* smd_open() / smd_named_open_on_edge()
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* smd_close()
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* smd_write*()
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* smd_read*()
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* smsm_*()
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h2. SMD based drivers
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h3. smd_tty
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Seems to expose tty devices (/dev/smdN) bound to SMD channels.
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h3. smd_nmea
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Exposes a tty device (/dev/nmea) bound to a SMD channel named "GPSNMEA".
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h3. diagfwd
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DIAG forwarding, see [[DIAG]]
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h3. u_smd usb gadget
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Used to forward data of certain USB endpoints towards other processors (mainly MDSP)
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h3. packet ports
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* Some kind of packet oriented interface towards the SMD
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* msm_smd_pkt.c contains driver
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** smdpkt0..7+smd22 devices, 2048 byte buffer
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** open/release/read/write/poll syscalls implemented
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|_.Pipe|_.Device|
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|DATA5_CNTL|smdcntl0|
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|DATA6_CNTL|smdcntl1|
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|DATA7_CNTL|smdcntl2|
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|DATA8_CNTL|smdcntl3|
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|DATA9_CNTL|smdcntl4|
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|DATA12_CNTL|smdcntl5|
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|DATA13_CNTL|smdcntl6|
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|DATA14_CNTL|smdcntl7|
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|DATA22|smd22|
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h3. hci_smd
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Apparently used to talk HCI to a bluetooth chip on a different processor.  Not used in the modem devices we've seen.
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h3. smd_qmi
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Binds to the following channels and exposes the related devices:
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|_.SMD Pipe|_.QMI Device|
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|SMD_DATA5_CNTL|/dev/qmi0|
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|SMD_DATA6_CNTL|/dev/qmi1|
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|SMD_DATA7_CNTL|/dev/qmi2|
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It seems this is an older generation of accessing [[QMI]] from the Linux application processor, which has now been replaced by qmuxd which opens @/dev/smdcntl@ devices and thus bypasses any QMI message parsing/interpretation inside the kernel?
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h3. msm_rmnet
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Implements a Linux kernel network device based on a SMD pipe
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|_.SMD Pipe|_.netdev|
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|DATA5|rmnet0|
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|DATA6|rmnet1|
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|DATA7|rmnet2|
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|DATA8|rmnet3|
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|DATA9|rmnet4|
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|DATA12|rmnet5|
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|DATA13|rmnet6|
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|DATA14|rmnet7|
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h2. MSM IPC (Inter Process Communications) socket
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Qualcomm implements a socket-based inter process communication on Linux.  It is implemented using a new address family, @AF_MSM_IPC@ (27).
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The socket is used as datagram type socket (SOCK_DGRAM).
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The socket address of a related socket consists of:
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* the socket family (AF_MSM_IPC)
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* a @struct msm_ipc_addr@, consisting of
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** a single address type byte
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** a port address (node_id, port_id)
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** a port name (service, instance)
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* arch/arm/mach-msm/ipc_socket.c
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* AF_MSM_IPC
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h2. available SMD pipes
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h3. SMD pipes on an [[EC25]]
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<pre>
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Primary allocation table:
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root@mdm9607-perf:~# cat /sys/kernel/debug/smd/ch
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ID|CHANNEL NAME       |T|PROC |STATE  |FIFO SZ|RDPTR  |WRPTR  |FLAGS   |DATAPEN
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-------------------------------------------------------------------------------
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 4|rpm_requests       |P|APPS |OPENED |0x00400|0x001E0|0x001E0|DCCiwRsB|0x00000
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  |                   | |RPM  |OPENED |0x00400|0x00118|0x00118|DCCiwrsB|0x00000
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-------------------------------------------------------------------------------
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 5|rpm_requests       |P|MDMSW| Access Restricted
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  |                   | |RPM  | Access Restricted
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-------------------------------------------------------------------------------
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 6|rpm_requests       |P|WCNSS| Access Restricted
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  |                   | |RPM  | Access Restricted
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-------------------------------------------------------------------------------
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 7|rpm_requests       |P|TZ   | Access Restricted
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  |                   | |RPM  | Access Restricted
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-------------------------------------------------------------------------------
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 8|rpm_requests       |P|ADSP | Access Restricted
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  |                   | |RPM  | Access Restricted
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-------------------------------------------------------------------------------
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APPS <-> MDMSW Primary allocation table:
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ID|CHANNEL NAME       |T|PROC |STATE  |FIFO SZ|RDPTR  |WRPTR  |FLAGS   |DATAPEN
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-------------------------------------------------------------------------------
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 0|DS                 |S|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000
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-------------------------------------------------------------------------------
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 1|IPCRTR             |P|APPS |OPENED |0x02000|0x012E4|0x012E4|DCCiwrsB|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x011F8|0x011F8|DCCiwrsB|0x00000
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-------------------------------------------------------------------------------
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 2|SSM_RTR_MODEM_APPS |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000
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  |                   | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000
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-------------------------------------------------------------------------------
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 3|DIAG_2_CMD         |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000
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-------------------------------------------------------------------------------
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 4|DIAG_2             |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000
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-------------------------------------------------------------------------------
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 5|DIAG_CNTL          |P|APPS |OPENED |0x02000|0x00062|0x00062|DCCiwrsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x007F5|0x007F5|DCCiwrsB|0x00000
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-------------------------------------------------------------------------------
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 6|DIAG_CMD           |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000
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-------------------------------------------------------------------------------
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 7|DIAG               |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00026|0x00026|DCCiwrsB|0x00000
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-------------------------------------------------------------------------------
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 8|apr_audio_svc      |P|APPS |OPENED |0x02000|0x002F0|0x002F0|DCCiwrsB|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00248|0x00248|DCCiwrsB|0x00000
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-------------------------------------------------------------------------------
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 9|apr_apps2          |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000
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  |                   | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000
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-------------------------------------------------------------------------------
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10|DATA1              |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000
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-------------------------------------------------------------------------------
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11|DATA2              |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000
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  |                   | |MDMSW|OPENING|0x02000|0x00000|0x00000|dCciwrSb|0x00000
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-------------------------------------------------------------------------------
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12|DATA3              |P|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000
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-------------------------------------------------------------------------------
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13|DATA4              |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000
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-------------------------------------------------------------------------------
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14|DATA11             |S|APPS |OPENED |0x02000|0x00089|0x00089|dcCiwRsb|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x0012B|0x0012B|dCciwrsB|0x00000
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-------------------------------------------------------------------------------
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15|DATA40             |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000
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  |                   | |MDMSW|OPENING|0x02000|0x00000|0x00000|dcciwrSb|0x00000
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-------------------------------------------------------------------------------
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16|DATA5_CNTL         |P|APPS |CLOSED |0x00400|0x00000|0x00000|dcciwrsb|0x00000
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  |                   | |MDMSW|OPENING|0x00400|0x00000|0x00000|DCCiwrSb|0x00000
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-------------------------------------------------------------------------------
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17|DATA40_CNTL        |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000
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  |                   | |MDMSW|OPENED |0x02000|0x00100|0x00100|DCCiwrsB|0x00000
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-------------------------------------------------------------------------------
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</pre>
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h3. SMD pipes on an [[EC20]]:
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<pre>
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/sys/kernel/debug/smd # cat ch 
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ch00:   OPENED(0000/0000) dcCiwrsb <->   OPENED(0000/0000) dCciwrsB :  2000
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ch04:   OPENED(27336/27336) DCCiwrsB <->   OPENED(6552/6552) DCCiwrsB :  8000
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ch05:   OPENED(0000/0000) DCCiwrsb <->   OPENED(12568/12568) DCCiwrsB : 10000
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ch06:   OPENED(1872/1872) DCCiwrsB <->   OPENED(0216/0216) DCCiwrsB :  2000
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ch07:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000
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ch08:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :   400
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ch09:   OPENED(0952/0952) DCCiwrsb <->   OPENED(0438/0438) DCCiwrsB :   400
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ch10:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsb :  2000
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ch11:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000
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ch12:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsb :  2000
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ch13:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000
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ch14:   OPENED(0480/0480) DCCiwrsB <->   OPENED(0376/0376) DCCiwrsB :   400
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ch15:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000
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ch16:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000
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ch17:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :   400
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ch18:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsb :  2000
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ch19:   OPENED(0952/0952) DCCiwrsb <->   OPENED(0370/0370) DCCiwrsB :   400
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ch20:   OPENED(0021/0021) DCCiwrsb <->   OPENED(0078/0078) DCCiwrsB :  2000
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ch21:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) DCCiwrSb :  2000
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ch22:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dCciwrSb :  2000
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ch23:   OPENED(0000/0000) dcCiwrsb <->   OPENED(0000/0000) dCciwrsB :  2000
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ch24:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) dCciwrsb :  2000
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ch25:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dCciwrSb :  2000
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ch26:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dCciwrSb :  2000
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ch27:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dcciwrSb :  2000
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ch28:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) DCCiwrsB :  2000
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ch29:   CLOSED(0000/0000) dcciwrsb <->  OPENING(0000/0000) dcciwrSb :  2000
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ch30:   OPENED(0295/0295) DCCiwrsB <->   OPENED(0563/0563) DCCiwrsB :   400
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ch31:   OPENED(0237/0237) DCCiwrsB <->   OPENED(0415/0415) DCCiwrsB :   400
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ch32:   OPENED(0237/0237) DCCiwrsB <->   OPENED(0415/0415) DCCiwrsB :   400
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ch33:   OPENED(0237/0237) DCCiwrsB <->   OPENED(0415/0415) DCCiwrsB :   400
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ch34:   OPENED(0000/0000) DCCiwrsb <->   OPENED(0000/0000) dCciwrsb :  2000
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</pre>
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<pre>
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/sys/kernel/debug/smd # cat tbl
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name=DS cid=0 ch type=0 xfer type=1 ref_count=2
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name= cid=0 ch type=0 xfer type=0 ref_count=0
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name= cid=0 ch type=0 xfer type=0 ref_count=0
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name= cid=0 ch type=0 xfer type=0 ref_count=0
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name=MSGR_SMD_P1 cid=4 ch type=11 xfer type=2 ref_count=2
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name=MSGR_SMD_P0 cid=5 ch type=11 xfer type=2 ref_count=2
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name=IPCRTR cid=6 ch type=1 xfer type=2 ref_count=1
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name=IPCRTR cid=7 ch type=2 xfer type=2 ref_count=1
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name=sys_mon cid=8 ch type=1 xfer type=2 ref_count=1
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name=DIAG_CNTL cid=9 ch type=1 xfer type=2 ref_count=2
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name=DIAG cid=10 ch type=1 xfer type=2 ref_count=2
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name=apr_audio_svc cid=11 ch type=1 xfer type=2 ref_count=1
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name=apr_voice_svc cid=12 ch type=2 xfer type=2 ref_count=2
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name=apr_apps2 cid=13 ch type=1 xfer type=2 ref_count=1
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name=RPCRPY_CNTL cid=14 ch type=0 xfer type=2 ref_count=2
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name=IPCROUTER cid=15 ch type=0 xfer type=0 ref_count=1
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name=SSM_RTR cid=16 ch type=0 xfer type=2 ref_count=1
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name=sys_mon cid=17 ch type=0 xfer type=2 ref_count=1
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name=DIAG_2 cid=18 ch type=0 xfer type=2 ref_count=2
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name=DIAG_CNTL cid=19 ch type=0 xfer type=2 ref_count=2
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name=DIAG cid=20 ch type=0 xfer type=2 ref_count=2
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name=apr_voice_svc cid=21 ch type=0 xfer type=2 ref_count=1
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name=DATA1 cid=22 ch type=0 xfer type=2 ref_count=2
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name=DATA2 cid=23 ch type=0 xfer type=2 ref_count=2
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name=DATA3 cid=24 ch type=0 xfer type=2 ref_count=2
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name=DATA4 cid=25 ch type=0 xfer type=2 ref_count=2
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name=DATA11 cid=26 ch type=0 xfer type=1 ref_count=2
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name=DATA40 cid=27 ch type=0 xfer type=2 ref_count=2
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name=DATA40_CNTL cid=28 ch type=0 xfer type=2 ref_count=2
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name=DATA8 cid=29 ch type=0 xfer type=2 ref_count=2
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name=DATA5_CNTL cid=30 ch type=0 xfer type=2 ref_count=2
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name=DATA6_CNTL cid=31 ch type=0 xfer type=2 ref_count=2
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name=DATA7_CNTL cid=32 ch type=0 xfer type=2 ref_count=2
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name=DATA8_CNTL cid=33 ch type=0 xfer type=2 ref_count=2
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name=GPSNMEA cid=34 ch type=0 xfer type=2 ref_count=2
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</pre>
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