Qualcomm Kernel » History » Version 15
laforge, 12/26/2016 06:55 PM
1 | 6 | laforge | {{>toc}} |
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2 | |||
3 | 1 | laforge | h1. Qualcomm Kernel |
4 | |||
5 | 13 | laforge | Random notes about the Qualcomm Kernel as used on the MDM9615 and MDM9x07. May also apply to other Qualcomm Linux based systems such as Android smartphones. |
6 | 1 | laforge | |
7 | h2. diag |
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8 | |||
9 | h3. diag forwarding |
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10 | |||
11 | <pre> |
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12 | drivers/char/diag/diagfwd.[ch] |
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13 | drivers/usb/gadget/f_diag.[ch] |
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14 | drivers/usb/misc/diag_bridge.c |
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15 | </pre> |
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16 | |||
17 | * the usb diag gadget handles diag packet read/write over usb |
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18 | * issues events like USB_DIAG_READ_DONE |
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19 | * picked up by diagfwd.c |
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20 | ** can forward diag requests via SMD shared memory to other processors |
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21 | |||
22 | h3. diag char |
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23 | |||
24 | 6 | laforge | The kernel exports a /dev/diag char device which userspce processes can |
25 | use to register/listen for DIAG events from the system, or actually |
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26 | register a DIAG 'subsystem' themselves which can then be controlled from |
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27 | QXDM. |
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28 | |||
29 | 1 | laforge | <pre> |
30 | drivers/char/diag/diagchar_core.c |
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31 | </pre> |
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32 | |||
33 | * ioctl()s for diag configuration |
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34 | * supports several concurrent diag clients |
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35 | * diag logging can be directed to USB/HSIC, character device and more |
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36 | ** {USB,CALLBACK,MEMORY_DEVICE,UART,NO_LOGGING}_MODE |
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37 | |||
38 | 5 | laforge | drivers/char/diag/diag_dci.c |
39 | 1 | laforge | |
40 | * DCI table is a routing table where pid/sockets can register for a |
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41 | given DCI. socket close/cleanup code releases all DCI routes for |
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42 | that socket. |
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43 | |||
44 | 7 | laforge | h4. DIAG_IOCTL_COMMAND_REG |
45 | |||
46 | * Register a new DIAG command so it can be used from the outside world (QXDM) |
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47 | * use 'struct diag_cmd_reg_entry_t' per command |
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48 | * driver keeps a driver->cmd_reg_list of registered commands |
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49 | |||
50 | h4. DIAG_IOCTL_COMMAND_DEREG |
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51 | |||
52 | * unregister debug command |
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53 | |||
54 | h4. DIAG_IOCTL_GET_DELAYED_RSP_ID |
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55 | |||
56 | h4. DIAG_IOCTL_DCI_REG |
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57 | |||
58 | h4. DIAG_IOCTL_DCI_DEINIT |
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59 | |||
60 | h4. DIAG_IOCTL_DCI_SUPPORT |
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61 | |||
62 | h4. DIAG_IOCTL_DCI_HEALTH_STATS |
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63 | |||
64 | h4. DIAG_IOCTL_DCI_LOG_STATUS |
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65 | |||
66 | h4. DIAG_IOCTL_DCI_EVENT_STATUS |
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67 | |||
68 | h4. DIAG_IOCTL_DCI_CLEAR_LOGS |
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69 | |||
70 | h4. DIAG_IOCTL_DCI_CLEAR_EVENTS |
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71 | |||
72 | h4. DIAG_IOCTL_LSM_DEINIT |
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73 | |||
74 | h4. DIAG_IOCTL_SWITCH_LOGGING |
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75 | |||
76 | * switch between USB and shared-memory diag |
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77 | * |
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78 | |||
79 | h4. DIAG_IOCTL_REMOTE_DEV |
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80 | |||
81 | h4. DIAG_IOCTL_VOTE_REAL_TIME |
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82 | |||
83 | h4. DIAG_IOCTL_GET_REAL_TIME |
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84 | |||
85 | h4. DIAG_IOCTL_PERIPHERAL_BUF_CONFIG |
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86 | |||
87 | h4. DIAG_IOCTL_PERIPHERAL_BUF_DRAIN |
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88 | |||
89 | h4. DIAG_IOCTL_REGISTER_CALLBACK |
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90 | |||
91 | * doen't really do anything but checking arguments ?!? |
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92 | |||
93 | h4. DIAG_IOCTL_HDLC_TOGGLE |
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94 | |||
95 | enable or disable HDLC framing of /dev/diag |
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96 | 6 | laforge | |
97 | 12 | laforge | |
98 | h2. IRSC (IPC Router Security Control) |
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99 | |||
100 | FIXME |
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101 | |||
102 | 1 | laforge | h2. SMD (shared memory) |
103 | |||
104 | * SMD sub-systems: |
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105 | ** Modem (assumed to be hexagon with modem firmware?) |
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106 | ** Q6 (formerly known as LPASS == Low Power Audio SubSystem) |
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107 | ** DSPS |
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108 | ** WCNSS (Wireless Connectivity Sub System) aka 'riva' |
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109 | ** RPM (Resource Power Manager) |
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110 | * inter-processor-interrupts for various 'edges' |
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111 | |||
112 | h3. core driver |
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113 | |||
114 | * arch/arm/mach-msm/smd.c |
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115 | |||
116 | h4. api |
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117 | |||
118 | * smd_open() |
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119 | * smd_close() |
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120 | * smd_write*() |
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121 | * smd_read*() |
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122 | 3 | laforge | * smsm_*() |
123 | 1 | laforge | |
124 | 12 | laforge | h3. MSM IPC (Inter Process Communications) socket |
125 | 1 | laforge | |
126 | 12 | laforge | Qualcomm implements a socket-based inter process communication on Linux. It is implemented using a new address family, @AF_MSM_IPC@ (27). |
127 | |||
128 | The socket is used as datagram type socket (SOCK_DGRAM). |
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129 | |||
130 | The socket address of a related socket consists of: |
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131 | |||
132 | * the socket family (AF_MSM_IPC) |
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133 | * a @struct msm_ipc_addr@, consisting of |
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134 | ** a single address type byte |
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135 | ** a port address (node_id, port_id) |
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136 | ** a port name (service, instance) |
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137 | |||
138 | 1 | laforge | * arch/arm/mach-msm/ipc_socket.c |
139 | * AF_MSM_IPC |
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140 | 3 | laforge | |
141 | h3. packet ports |
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142 | 1 | laforge | |
143 | * Some kind of packet oriented interface towards the SMD |
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144 | * msm_smd_pkt.c contains driver |
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145 | ** smdpkt0..7+smd22 devices, 2048 byte buffer |
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146 | ** open/release/read/write/poll syscalls implemented |
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147 | 10 | laforge | |
148 | h3. available SMD devices |
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149 | |||
150 | From an EC25: |
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151 | <pre> |
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152 | Primary allocation table: |
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153 | root@mdm9607-perf:~# cat /sys/kernel/debug/smd/ch |
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154 | ID|CHANNEL NAME |T|PROC |STATE |FIFO SZ|RDPTR |WRPTR |FLAGS |DATAPEN |
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155 | ------------------------------------------------------------------------------- |
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156 | 4|rpm_requests |P|APPS |OPENED |0x00400|0x001E0|0x001E0|DCCiwRsB|0x00000 |
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157 | | | |RPM |OPENED |0x00400|0x00118|0x00118|DCCiwrsB|0x00000 |
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158 | ------------------------------------------------------------------------------- |
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159 | 5|rpm_requests |P|MDMSW| Access Restricted |
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160 | | | |RPM | Access Restricted |
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161 | ------------------------------------------------------------------------------- |
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162 | 6|rpm_requests |P|WCNSS| Access Restricted |
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163 | | | |RPM | Access Restricted |
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164 | ------------------------------------------------------------------------------- |
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165 | 7|rpm_requests |P|TZ | Access Restricted |
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166 | | | |RPM | Access Restricted |
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167 | ------------------------------------------------------------------------------- |
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168 | 8|rpm_requests |P|ADSP | Access Restricted |
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169 | | | |RPM | Access Restricted |
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170 | ------------------------------------------------------------------------------- |
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171 | |||
172 | |||
173 | APPS <-> MDMSW Primary allocation table: |
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174 | ID|CHANNEL NAME |T|PROC |STATE |FIFO SZ|RDPTR |WRPTR |FLAGS |DATAPEN |
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175 | ------------------------------------------------------------------------------- |
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176 | 0|DS |S|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000 |
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177 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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178 | ------------------------------------------------------------------------------- |
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179 | 1|IPCRTR |P|APPS |OPENED |0x02000|0x012E4|0x012E4|DCCiwrsB|0x00000 |
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180 | | | |MDMSW|OPENED |0x02000|0x011F8|0x011F8|DCCiwrsB|0x00000 |
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181 | ------------------------------------------------------------------------------- |
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182 | 2|SSM_RTR_MODEM_APPS |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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183 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000 |
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184 | ------------------------------------------------------------------------------- |
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185 | 3|DIAG_2_CMD |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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186 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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187 | ------------------------------------------------------------------------------- |
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188 | 4|DIAG_2 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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189 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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190 | ------------------------------------------------------------------------------- |
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191 | 5|DIAG_CNTL |P|APPS |OPENED |0x02000|0x00062|0x00062|DCCiwrsb|0x00000 |
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192 | | | |MDMSW|OPENED |0x02000|0x007F5|0x007F5|DCCiwrsB|0x00000 |
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193 | ------------------------------------------------------------------------------- |
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194 | 6|DIAG_CMD |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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195 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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196 | ------------------------------------------------------------------------------- |
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197 | 7|DIAG |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsb|0x00000 |
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198 | | | |MDMSW|OPENED |0x02000|0x00026|0x00026|DCCiwrsB|0x00000 |
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199 | ------------------------------------------------------------------------------- |
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200 | 8|apr_audio_svc |P|APPS |OPENED |0x02000|0x002F0|0x002F0|DCCiwrsB|0x00000 |
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201 | | | |MDMSW|OPENED |0x02000|0x00248|0x00248|DCCiwrsB|0x00000 |
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202 | ------------------------------------------------------------------------------- |
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203 | 9|apr_apps2 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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204 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|DCCiwrSb|0x00000 |
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205 | ------------------------------------------------------------------------------- |
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206 | 10|DATA1 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 |
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207 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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208 | ------------------------------------------------------------------------------- |
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209 | 11|DATA2 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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210 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|dCciwrSb|0x00000 |
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211 | ------------------------------------------------------------------------------- |
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212 | 12|DATA3 |P|APPS |OPENED |0x02000|0x00000|0x00000|dcCiwrsb|0x00000 |
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213 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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214 | ------------------------------------------------------------------------------- |
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215 | 13|DATA4 |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 |
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216 | | | |MDMSW|OPENED |0x02000|0x00000|0x00000|dCciwrsb|0x00000 |
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217 | ------------------------------------------------------------------------------- |
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218 | 14|DATA11 |S|APPS |OPENED |0x02000|0x00089|0x00089|dcCiwRsb|0x00000 |
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219 | | | |MDMSW|OPENED |0x02000|0x0012B|0x0012B|dCciwrsB|0x00000 |
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220 | ------------------------------------------------------------------------------- |
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221 | 15|DATA40 |P|APPS |CLOSED |0x02000|0x00000|0x00000|dcciwrsb|0x00000 |
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222 | | | |MDMSW|OPENING|0x02000|0x00000|0x00000|dcciwrSb|0x00000 |
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223 | ------------------------------------------------------------------------------- |
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224 | 16|DATA5_CNTL |P|APPS |CLOSED |0x00400|0x00000|0x00000|dcciwrsb|0x00000 |
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225 | | | |MDMSW|OPENING|0x00400|0x00000|0x00000|DCCiwrSb|0x00000 |
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226 | ------------------------------------------------------------------------------- |
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227 | 17|DATA40_CNTL |P|APPS |OPENED |0x02000|0x00000|0x00000|DCCiwrsB|0x00000 |
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228 | | | |MDMSW|OPENED |0x02000|0x00100|0x00100|DCCiwrsB|0x00000 |
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229 | ------------------------------------------------------------------------------- |
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230 | </pre> |
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231 | 6 | laforge | |
232 | 14 | laforge | From an [[EC20]]: |
233 | |||
234 | <pre> |
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235 | /sys/kernel/debug/smd # cat ch |
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236 | ch00: OPENED(0000/0000) dcCiwrsb <-> OPENED(0000/0000) dCciwrsB : 2000 |
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237 | ch04: OPENED(27336/27336) DCCiwrsB <-> OPENED(6552/6552) DCCiwrsB : 8000 |
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238 | ch05: OPENED(0000/0000) DCCiwrsb <-> OPENED(12568/12568) DCCiwrsB : 10000 |
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239 | ch06: OPENED(1872/1872) DCCiwrsB <-> OPENED(0216/0216) DCCiwrsB : 2000 |
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240 | ch07: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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241 | ch08: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 400 |
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242 | ch09: OPENED(0952/0952) DCCiwrsb <-> OPENED(0438/0438) DCCiwrsB : 400 |
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243 | ch10: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 |
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244 | ch11: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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245 | ch12: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 |
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246 | ch13: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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247 | ch14: OPENED(0480/0480) DCCiwrsB <-> OPENED(0376/0376) DCCiwrsB : 400 |
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248 | ch15: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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249 | ch16: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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250 | ch17: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 400 |
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251 | ch18: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsb : 2000 |
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252 | ch19: OPENED(0952/0952) DCCiwrsb <-> OPENED(0370/0370) DCCiwrsB : 400 |
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253 | ch20: OPENED(0021/0021) DCCiwrsb <-> OPENED(0078/0078) DCCiwrsB : 2000 |
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254 | ch21: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) DCCiwrSb : 2000 |
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255 | ch22: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 |
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256 | ch23: OPENED(0000/0000) dcCiwrsb <-> OPENED(0000/0000) dCciwrsB : 2000 |
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257 | ch24: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) dCciwrsb : 2000 |
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258 | ch25: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 |
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259 | ch26: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dCciwrSb : 2000 |
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260 | ch27: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dcciwrSb : 2000 |
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261 | ch28: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) DCCiwrsB : 2000 |
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262 | ch29: CLOSED(0000/0000) dcciwrsb <-> OPENING(0000/0000) dcciwrSb : 2000 |
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263 | ch30: OPENED(0295/0295) DCCiwrsB <-> OPENED(0563/0563) DCCiwrsB : 400 |
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264 | ch31: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 |
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265 | ch32: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 |
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266 | ch33: OPENED(0237/0237) DCCiwrsB <-> OPENED(0415/0415) DCCiwrsB : 400 |
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267 | ch34: OPENED(0000/0000) DCCiwrsb <-> OPENED(0000/0000) dCciwrsb : 2000 |
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268 | </pre> |
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269 | |||
270 | <pre> |
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271 | /sys/kernel/debug/smd # cat tbl |
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272 | name=DS cid=0 ch type=0 xfer type=1 ref_count=2 |
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273 | name= cid=0 ch type=0 xfer type=0 ref_count=0 |
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274 | name= cid=0 ch type=0 xfer type=0 ref_count=0 |
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275 | name= cid=0 ch type=0 xfer type=0 ref_count=0 |
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276 | name=MSGR_SMD_P1 cid=4 ch type=11 xfer type=2 ref_count=2 |
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277 | name=MSGR_SMD_P0 cid=5 ch type=11 xfer type=2 ref_count=2 |
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278 | name=IPCRTR cid=6 ch type=1 xfer type=2 ref_count=1 |
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279 | name=IPCRTR cid=7 ch type=2 xfer type=2 ref_count=1 |
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280 | name=sys_mon cid=8 ch type=1 xfer type=2 ref_count=1 |
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281 | name=DIAG_CNTL cid=9 ch type=1 xfer type=2 ref_count=2 |
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282 | name=DIAG cid=10 ch type=1 xfer type=2 ref_count=2 |
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283 | name=apr_audio_svc cid=11 ch type=1 xfer type=2 ref_count=1 |
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284 | name=apr_voice_svc cid=12 ch type=2 xfer type=2 ref_count=2 |
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285 | name=apr_apps2 cid=13 ch type=1 xfer type=2 ref_count=1 |
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286 | name=RPCRPY_CNTL cid=14 ch type=0 xfer type=2 ref_count=2 |
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287 | name=IPCROUTER cid=15 ch type=0 xfer type=0 ref_count=1 |
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288 | name=SSM_RTR cid=16 ch type=0 xfer type=2 ref_count=1 |
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289 | name=sys_mon cid=17 ch type=0 xfer type=2 ref_count=1 |
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290 | name=DIAG_2 cid=18 ch type=0 xfer type=2 ref_count=2 |
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291 | name=DIAG_CNTL cid=19 ch type=0 xfer type=2 ref_count=2 |
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292 | name=DIAG cid=20 ch type=0 xfer type=2 ref_count=2 |
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293 | name=apr_voice_svc cid=21 ch type=0 xfer type=2 ref_count=1 |
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294 | name=DATA1 cid=22 ch type=0 xfer type=2 ref_count=2 |
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295 | name=DATA2 cid=23 ch type=0 xfer type=2 ref_count=2 |
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296 | name=DATA3 cid=24 ch type=0 xfer type=2 ref_count=2 |
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297 | name=DATA4 cid=25 ch type=0 xfer type=2 ref_count=2 |
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298 | name=DATA11 cid=26 ch type=0 xfer type=1 ref_count=2 |
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299 | name=DATA40 cid=27 ch type=0 xfer type=2 ref_count=2 |
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300 | name=DATA40_CNTL cid=28 ch type=0 xfer type=2 ref_count=2 |
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301 | name=DATA8 cid=29 ch type=0 xfer type=2 ref_count=2 |
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302 | name=DATA5_CNTL cid=30 ch type=0 xfer type=2 ref_count=2 |
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303 | name=DATA6_CNTL cid=31 ch type=0 xfer type=2 ref_count=2 |
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304 | name=DATA7_CNTL cid=32 ch type=0 xfer type=2 ref_count=2 |
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305 | name=DATA8_CNTL cid=33 ch type=0 xfer type=2 ref_count=2 |
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306 | name=GPSNMEA cid=34 ch type=0 xfer type=2 ref_count=2 |
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307 | </pre> |
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308 | |||
309 | |||
310 | 6 | laforge | h2. smem_log |
311 | |||
312 | This is some kidn of high speed shared memory based event log to which all processors can log events. |
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313 | |||
314 | Userspace applications can use write() to @/dev/smem_log@ to add log entries. |
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315 | |||
316 | Qualcomm uses a proprietary minimal shim layer offering SMEM_LOG_EVENT and SMEM_LOG_EVENT6 macros |
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317 | that can be used to write events with an event ID plus three data words or six data words, respectively. |
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318 | |||
319 | The shared memory log can be read from linux userspace via debugfs, see the devices in @/sys/kernel/debug/smem_log@ |
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320 | and simply use @cat@ on them. You will get lines like |
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321 | <pre> |
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322 | MODM: 3982377401 000d0000: 00000001: 03000019 01000028 01000015 53505041 00000061 5f696d71 |
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323 | MODM: 3982378159 QCSI: 00000004: 00040029 00240015 00000003 00000001 0000002b 00000000 |
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324 | MODM: 3982378619 000d0000: 00000001: 03000019 0100002b 01000015 53505041 00000061 5f696d71 |
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325 | APPS: 3982397356 QCCI: 00000005: 0004001d 0024000e 00000003 00000003 00000019 00000000 |
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326 | APPS: 3982400571 QCCI: 00000005: 00040029 0024000e 00000003 00000003 00000019 00000000 |
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327 | MODM: 1841235211 QCSI: 00000004: 0004001e 0024001c 00000003 00000001 00000028 00000000 |
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328 | MODM: 1841236665 000d0000: 00000001: 03000019 01000028 0101001c 53505041 00000061 5f696d71 |
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329 | MODM: 1841241411 QCSI: 00000004: 0004002a 0024001c 00000003 00000001 0000002b 00000000 |
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330 | MODM: 1841242246 000d0000: 00000001: 03000019 0100002b 0100001c 53505041 00000061 5f696d71 |
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331 | MODM: 1841243796 QCSI: 00000004: 0004002b 00660019 00000003 00000001 0000002b 00000000 |
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332 | MODM: 1841244286 000d0000: 00000001: 03000019 0100002b 01000019 53505041 00000061 5f696d71 |
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333 | APPS: 1841255456 QCCI: 00000005: 0004001e 00240015 00000003 00000003 00000019 00000000 |
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334 | MODM: 1841255335 000d0000: 00000002: 0100ffff 0300ffff 07000014 53505041 0000016c 74646d73 |
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335 | MODM: 1841255828 000d0000: 00000702: 00000001 00000028 00000007 |
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336 | 1 | laforge | APPS: 1841261430 QCCI: 00000005: 0004002a 00240015 00000003 00000003 00000019 00000000 |
337 | </pre> |
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338 | 12 | laforge | |
339 | More information in @smem_log.h@ |
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340 | 8 | laforge | |
341 | h2. rmnet |
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342 | |||
343 | "remote network" ? |
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344 | * consists of control channel and data channel |
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345 | * data channel carries IP data |
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346 | * control channel carries QMI messages |
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347 | |||
348 | * drivers/net/ethernet/msm/msm_rmnet_bam.c |
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349 | ** 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 |
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350 | ** use msm_bam_dmux_open() to attach |
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351 | ** use RMNET_IOCTL_GET_EPID to get the BAM_DMUX endpoint id |
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352 | |||
353 | h2. bam (Bus Access Manager/Module) |
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354 | |||
355 | * The Bus Access Manager/Module (BAM) can be |
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356 | considered as a distributed data mover (DM) |
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357 | * some kind of DMA controller/engine |
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358 | * A number of the on-chip devices have their own BAM DMA controller |
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359 | and use it to move data between system memory and peripherals or |
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360 | between two peripherals. |
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361 | |||
362 | Files: |
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363 | <pre> |
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364 | ./drivers/dma/qcom_bam_dma.c |
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365 | ./drivers/net/ethernet/msm/msm_rmnet_bam.c |
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366 | ./drivers/platform/msm/sps/bam.c |
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367 | ./drivers/platform/msm/sps/sps_bam.c |
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368 | ./drivers/platform/msm/usb_bam.c |
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369 | </pre> |
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370 | |||
371 | * channels (BAM_DMUX_) |
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372 | ** RMNET_0...7 |
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373 | ** USB_RMNET_0 |
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374 | ** DATA_REV_RMNET_0..8 |
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375 | ** USB_DPL |
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376 | |||
377 | seem to be be based on dmux ./drivers/soc/qcom/bam_dmux.c |
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378 | |||
379 | h2. IPA (Internet Packet Accelerator) |
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380 | |||
381 | Internet Packet Accelerator (IPA) is a programmable protocol |
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382 | processor HW block. It is designed to support generic HW processing |
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383 | of UL/DL IP packets for various use cases independent of radio |
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384 | technology. |
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385 | |||
386 | See drivers/platform/msm/ipa/ |
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387 | |||
388 | 11 | laforge | http://www.sumobrain.com/patents/wipo/Accelerator/WO2013063791A1.pdf |
389 | |||
390 | |||
391 | 8 | laforge | h2. bam2bam |
392 | |||
393 | maybe soem kind of direct connection between two peripherals by means of the BAM? |
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394 | |||
395 | h2. Android USB Gadget |
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396 | |||
397 | see [[Android_USB_Gadget]] |
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398 | 9 | laforge | |
399 | h2. IPC Logging |
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400 | |||
401 | see [[IPC_Logging]] |