Qualcomm Linux SMD » History » Version 7
laforge, 12/26/2016 07:52 PM
| 1 | 1 | laforge | {{>toc}} |
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| 2 | |||
| 3 | h1. Qualcomm Linux SMD (Shared Memory Device) |
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| 4 | |||
| 5 | 2 | laforge | 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_. |
| 6 | 1 | laforge | |
| 7 | 2 | laforge | * SMD sub-systems we know of: |
| 8 | ** APPS (applications processor, this is the Linux system) |
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| 9 | 1 | laforge | ** Modem (assumed to be hexagon with modem firmware?) |
| 10 | ** Q6 (formerly known as LPASS == Low Power Audio SubSystem) |
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| 11 | ** DSPS |
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| 12 | ** WCNSS (Wireless Connectivity Sub System) aka 'riva' |
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| 13 | ** RPM (Resource Power Manager) |
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| 14 | * inter-processor-interrupts for various 'edges' |
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| 15 | 2 | laforge | |
| 16 | In the MDM9615/9x07 based devices it seems there is only the RPM, MODEM and APPS. |
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| 17 | 1 | laforge | |
| 18 | h2. core driver |
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| 19 | |||
| 20 | * arch/arm/mach-msm/smd.c |
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| 21 | |||
| 22 | h3. api |
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| 23 | |||
| 24 | 5 | laforge | * smd_open() / smd_named_open_on_edge() |
| 25 | 1 | laforge | * smd_close() |
| 26 | * smd_write*() |
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| 27 | * smd_read*() |
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| 28 | * smsm_*() |
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| 29 | |||
| 30 | h2. SMD based drivers |
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| 31 | |||
| 32 | h3. smd_tty |
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| 33 | |||
| 34 | Seems to expose tty devices (/dev/smdN) bound to SMD channels. |
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| 35 | |||
| 36 | h3. smd_nmea |
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| 37 | |||
| 38 | Exposes a tty device (/dev/nmea) bound to a SMD channel named "GPSNMEA". |
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| 39 | |||
| 40 | h3. diagfwd |
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| 41 | |||
| 42 | DIAG forwarding, see [[DIAG]] |
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| 43 | |||
| 44 | h3. u_smd usb gadget |
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| 45 | |||
| 46 | Used to forward data of certain USB endpoints towards other processors (mainly MDSP) |
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| 47 | |||
| 48 | 3 | laforge | h3. packet ports |
| 49 | 1 | laforge | |
| 50 | 3 | laforge | * Some kind of packet oriented interface towards the SMD |
| 51 | * msm_smd_pkt.c contains driver |
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| 52 | ** smdpkt0..7+smd22 devices, 2048 byte buffer |
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| 53 | ** open/release/read/write/poll syscalls implemented |
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| 54 | |||
| 55 | 4 | laforge | h3. hci_smd |
| 56 | |||
| 57 | 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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| 58 | |||
| 59 | 6 | laforge | h3. smd_qmi |
| 60 | |||
| 61 | Binds to the following channels and exposes the related devices: |
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| 62 | |||
| 63 | |_.SMD Pipe|_.QMI Device| |
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| 64 | |SMD_DATA5_CNTL|/dev/qmi0| |
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| 65 | |SMD_DATA6_CNTL|/dev/qmi1| |
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| 66 | |SMD_DATA7_CNTL|/dev/qmi2| |
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| 67 | |||
| 68 | 7 | laforge | 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? |
| 69 | 4 | laforge | |
| 70 | 1 | laforge | h2. MSM IPC (Inter Process Communications) socket |
| 71 | |||
| 72 | 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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| 73 | |||
| 74 | The socket is used as datagram type socket (SOCK_DGRAM). |
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| 75 | |||
| 76 | The socket address of a related socket consists of: |
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| 77 | |||
| 78 | * the socket family (AF_MSM_IPC) |
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| 79 | * a @struct msm_ipc_addr@, consisting of |
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| 80 | ** a single address type byte |
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| 81 | ** a port address (node_id, port_id) |
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| 82 | ** a port name (service, instance) |
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| 83 | |||
| 84 | * arch/arm/mach-msm/ipc_socket.c |
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| 85 | * AF_MSM_IPC |
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| 86 | |||
| 87 | |||
| 88 | h2. available SMD pipes |
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| 89 | |||
| 90 | h3. SMD pipes on an [[EC25]] |
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| 91 | |||
| 92 | <pre> |
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| 93 | Primary allocation table: |
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| 94 | root@mdm9607-perf:~# cat /sys/kernel/debug/smd/ch |
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| 95 | ID|CHANNEL NAME |T|PROC |STATE |FIFO SZ|RDPTR |WRPTR |FLAGS |DATAPEN |
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| 96 | ------------------------------------------------------------------------------- |
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| 97 | 4|rpm_requests |P|APPS |OPENED |0x00400|0x001E0|0x001E0|DCCiwRsB|0x00000 |
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| 98 | | | |RPM |OPENED |0x00400|0x00118|0x00118|DCCiwrsB|0x00000 |
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| 99 | ------------------------------------------------------------------------------- |
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| 100 | 5|rpm_requests |P|MDMSW| Access Restricted |
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| 101 | | | |RPM | Access Restricted |
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| 102 | ------------------------------------------------------------------------------- |
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| 103 | 6|rpm_requests |P|WCNSS| Access Restricted |
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| 104 | | | |RPM | Access Restricted |
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| 105 | ------------------------------------------------------------------------------- |
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| 106 | 7|rpm_requests |P|TZ | Access Restricted |
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| 107 | | | |RPM | Access Restricted |
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| 108 | ------------------------------------------------------------------------------- |
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| 109 | 8|rpm_requests |P|ADSP | Access Restricted |
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| 110 | | | |RPM | Access Restricted |
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| 111 | ------------------------------------------------------------------------------- |
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| 112 | |||
| 113 | |||
| 114 | APPS <-> MDMSW Primary allocation table: |
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| 115 | ID|CHANNEL NAME |T|PROC |STATE |FIFO SZ|RDPTR |WRPTR |FLAGS |DATAPEN |
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| 116 | ------------------------------------------------------------------------------- |
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| 117 | 0|DS |S|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000 |
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| 118 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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| 119 | ------------------------------------------------------------------------------- |
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| 120 | 1|IPCRTR |P|APPS |OPENED |0x02000|0x012E4|0x012E4|DCCiwrsB|0x00000 |
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| 121 | | | |MDMSW|OPENED |0x02000|0x011F8|0x011F8|DCCiwrsB|0x00000 |
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| 122 | ------------------------------------------------------------------------------- |
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| 123 | 2|SSM_RTR_MODEM_APPS |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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| 124 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000 |
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| 125 | ------------------------------------------------------------------------------- |
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| 126 | 3|DIAG_2_CMD |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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| 127 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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| 128 | ------------------------------------------------------------------------------- |
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| 129 | 4|DIAG_2 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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| 130 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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| 131 | ------------------------------------------------------------------------------- |
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| 132 | 5|DIAG_CNTL |P|APPS |OPENED |0x02000|0x00062|0x00062|DCCiwrsb|0x00000 |
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| 133 | | | |MDMSW|OPENED |0x02000|0x007F5|0x007F5|DCCiwrsB|0x00000 |
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| 134 | ------------------------------------------------------------------------------- |
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| 135 | 6|DIAG_CMD |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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| 136 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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| 137 | ------------------------------------------------------------------------------- |
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| 138 | 7|DIAG |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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| 139 | | | |MDMSW|OPENED |0x02000|0x00026|0x00026|DCCiwrsB|0x00000 |
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| 140 | ------------------------------------------------------------------------------- |
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| 141 | 8|apr_audio_svc |P|APPS |OPENED |0x02000|0x002F0|0x002F0|DCCiwrsB|0x00000 |
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| 142 | | | |MDMSW|OPENED |0x02000|0x00248|0x00248|DCCiwrsB|0x00000 |
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| 143 | ------------------------------------------------------------------------------- |
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| 144 | 9|apr_apps2 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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| 145 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000 |
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| 146 | ------------------------------------------------------------------------------- |
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| 147 | 10|DATA1 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 |
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| 148 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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| 149 | ------------------------------------------------------------------------------- |
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| 150 | 11|DATA2 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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| 151 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|dCciwrSb|0x00000 |
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| 152 | ------------------------------------------------------------------------------- |
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| 153 | 12|DATA3 |P|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000 |
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| 154 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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| 155 | ------------------------------------------------------------------------------- |
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| 156 | 13|DATA4 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 |
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| 157 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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| 158 | ------------------------------------------------------------------------------- |
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| 159 | 14|DATA11 |S|APPS |OPENED |0x02000|0x00089|0x00089|dcCiwRsb|0x00000 |
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| 160 | | | |MDMSW|OPENED |0x02000|0x0012B|0x0012B|dCciwrsB|0x00000 |
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| 161 | ------------------------------------------------------------------------------- |
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| 162 | 15|DATA40 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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| 163 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|dcciwrSb|0x00000 |
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| 164 | ------------------------------------------------------------------------------- |
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| 165 | 16|DATA5_CNTL |P|APPS |CLOSED |0x00400|0x00000|0x00000|dcciwrsb|0x00000 |
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| 166 | | | |MDMSW|OPENING|0x00400|0x00000|0x00000|DCCiwrSb|0x00000 |
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| 167 | ------------------------------------------------------------------------------- |
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| 168 | 17|DATA40_CNTL |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 |
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| 169 | | | |MDMSW|OPENED |0x02000|0x00100|0x00100|DCCiwrsB|0x00000 |
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| 170 | ------------------------------------------------------------------------------- |
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| 171 | </pre> |
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| 172 | |||
| 173 | h3. SMD pipes on an [[EC20]]: |
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| 174 | |||
| 175 | <pre> |
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| 176 | /sys/kernel/debug/smd # cat ch |
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| 177 | ch00: OPENED(0000/0000) dcCiwrsb <-> OPENED(0000/0000) dCciwrsB : 2000 |
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| 178 | ch04: OPENED(27336/27336) DCCiwrsB <-> OPENED(6552/6552) DCCiwrsB : 8000 |
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| 179 | ch05: OPENED(0000/0000) DCCiwrsb <-> OPENED(12568/12568) DCCiwrsB : 10000 |
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| 180 | ch06: OPENED(1872/1872) DCCiwrsB <-> OPENED(0216/0216) DCCiwrsB : 2000 |
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| 181 | ch07: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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| 182 | ch08: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 400 |
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| 183 | ch09: OPENED(0952/0952) DCCiwrsb <-> OPENED(0438/0438) DCCiwrsB : 400 |
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| 184 | ch10: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 |
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| 185 | ch11: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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| 186 | ch12: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 |
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| 187 | ch13: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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| 188 | ch14: OPENED(0480/0480) DCCiwrsB <-> OPENED(0376/0376) DCCiwrsB : 400 |
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| 189 | ch15: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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| 190 | ch16: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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| 191 | ch17: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 400 |
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| 192 | ch18: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 |
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| 193 | ch19: OPENED(0952/0952) DCCiwrsb <-> OPENED(0370/0370) DCCiwrsB : 400 |
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| 194 | ch20: OPENED(0021/0021) DCCiwrsb <-> OPENED(0078/0078) DCCiwrsB : 2000 |
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| 195 | ch21: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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| 196 | ch22: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 |
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| 197 | ch23: OPENED(0000/0000) dcCiwrsb <-> OPENED(0000/0000) dCciwrsB : 2000 |
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| 198 | ch24: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) dCciwrsb : 2000 |
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| 199 | ch25: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 |
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| 200 | ch26: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 |
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| 201 | ch27: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dcciwrSb : 2000 |
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| 202 | ch28: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsB : 2000 |
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| 203 | ch29: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dcciwrSb : 2000 |
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| 204 | ch30: OPENED(0295/0295) DCCiwrsB <-> OPENED(0563/0563) DCCiwrsB : 400 |
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| 205 | ch31: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 |
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| 206 | ch32: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 |
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| 207 | ch33: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 |
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| 208 | ch34: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) dCciwrsb : 2000 |
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| 209 | </pre> |
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| 210 | |||
| 211 | <pre> |
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| 212 | /sys/kernel/debug/smd # cat tbl |
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| 213 | name=DS cid=0 ch type=0 xfer type=1 ref_count=2 |
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| 214 | name= cid=0 ch type=0 xfer type=0 ref_count=0 |
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| 215 | name= cid=0 ch type=0 xfer type=0 ref_count=0 |
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| 216 | name= cid=0 ch type=0 xfer type=0 ref_count=0 |
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| 217 | name=MSGR_SMD_P1 cid=4 ch type=11 xfer type=2 ref_count=2 |
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| 218 | name=MSGR_SMD_P0 cid=5 ch type=11 xfer type=2 ref_count=2 |
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| 219 | name=IPCRTR cid=6 ch type=1 xfer type=2 ref_count=1 |
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| 220 | name=IPCRTR cid=7 ch type=2 xfer type=2 ref_count=1 |
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| 221 | name=sys_mon cid=8 ch type=1 xfer type=2 ref_count=1 |
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| 222 | name=DIAG_CNTL cid=9 ch type=1 xfer type=2 ref_count=2 |
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| 223 | name=DIAG cid=10 ch type=1 xfer type=2 ref_count=2 |
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| 224 | name=apr_audio_svc cid=11 ch type=1 xfer type=2 ref_count=1 |
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| 225 | name=apr_voice_svc cid=12 ch type=2 xfer type=2 ref_count=2 |
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| 226 | name=apr_apps2 cid=13 ch type=1 xfer type=2 ref_count=1 |
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| 227 | name=RPCRPY_CNTL cid=14 ch type=0 xfer type=2 ref_count=2 |
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| 228 | name=IPCROUTER cid=15 ch type=0 xfer type=0 ref_count=1 |
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| 229 | name=SSM_RTR cid=16 ch type=0 xfer type=2 ref_count=1 |
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| 230 | name=sys_mon cid=17 ch type=0 xfer type=2 ref_count=1 |
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| 231 | name=DIAG_2 cid=18 ch type=0 xfer type=2 ref_count=2 |
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| 232 | name=DIAG_CNTL cid=19 ch type=0 xfer type=2 ref_count=2 |
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| 233 | name=DIAG cid=20 ch type=0 xfer type=2 ref_count=2 |
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| 234 | name=apr_voice_svc cid=21 ch type=0 xfer type=2 ref_count=1 |
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| 235 | name=DATA1 cid=22 ch type=0 xfer type=2 ref_count=2 |
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| 236 | name=DATA2 cid=23 ch type=0 xfer type=2 ref_count=2 |
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| 237 | name=DATA3 cid=24 ch type=0 xfer type=2 ref_count=2 |
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| 238 | name=DATA4 cid=25 ch type=0 xfer type=2 ref_count=2 |
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| 239 | name=DATA11 cid=26 ch type=0 xfer type=1 ref_count=2 |
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| 240 | name=DATA40 cid=27 ch type=0 xfer type=2 ref_count=2 |
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| 241 | name=DATA40_CNTL cid=28 ch type=0 xfer type=2 ref_count=2 |
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| 242 | name=DATA8 cid=29 ch type=0 xfer type=2 ref_count=2 |
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| 243 | name=DATA5_CNTL cid=30 ch type=0 xfer type=2 ref_count=2 |
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| 244 | name=DATA6_CNTL cid=31 ch type=0 xfer type=2 ref_count=2 |
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| 245 | name=DATA7_CNTL cid=32 ch type=0 xfer type=2 ref_count=2 |
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| 246 | name=DATA8_CNTL cid=33 ch type=0 xfer type=2 ref_count=2 |
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| 247 | name=GPSNMEA cid=34 ch type=0 xfer type=2 ref_count=2 |
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| 248 | </pre> |
