^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Intel Management Engine Interface (Intel MEI) Linux driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2015, Intel Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/uuid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/mei_cl_bus.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * iAMT Watchdog Device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define INTEL_AMT_WATCHDOG_ID "iamt_wdt"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define MEI_WDT_DEFAULT_TIMEOUT 120 /* seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define MEI_WDT_MIN_TIMEOUT 120 /* seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define MEI_WDT_MAX_TIMEOUT 65535 /* seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /* Commands */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define MEI_MANAGEMENT_CONTROL 0x02
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) /* MEI Management Control version number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define MEI_MC_VERSION_NUMBER 0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* Sub Commands */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define MEI_MC_START_WD_TIMER_REQ 0x13
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define MEI_MC_START_WD_TIMER_RES 0x83
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define MEI_WDT_STATUS_SUCCESS 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define MEI_WDT_WDSTATE_NOT_REQUIRED 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define MEI_MC_STOP_WD_TIMER_REQ 0x14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * enum mei_wdt_state - internal watchdog state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * @MEI_WDT_PROBE: wd in probing stage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * @MEI_WDT_IDLE: wd is idle and not opened
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * @MEI_WDT_START: wd was opened, start was called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * @MEI_WDT_RUNNING: wd is expecting keep alive pings
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * @MEI_WDT_STOPPING: wd is stopping and will move to IDLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * @MEI_WDT_NOT_REQUIRED: wd device is not required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) enum mei_wdt_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) MEI_WDT_PROBE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) MEI_WDT_IDLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) MEI_WDT_START,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) MEI_WDT_RUNNING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) MEI_WDT_STOPPING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) MEI_WDT_NOT_REQUIRED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static const char *mei_wdt_state_str(enum mei_wdt_state state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) switch (state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) case MEI_WDT_PROBE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return "PROBE";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) case MEI_WDT_IDLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) return "IDLE";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) case MEI_WDT_START:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return "START";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) case MEI_WDT_RUNNING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) return "RUNNING";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) case MEI_WDT_STOPPING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return "STOPPING";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) case MEI_WDT_NOT_REQUIRED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return "NOT_REQUIRED";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return "unknown";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * struct mei_wdt - mei watchdog driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * @wdd: watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * @cldev: mei watchdog client device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * @state: watchdog internal state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * @resp_required: ping required response
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * @response: ping response completion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * @unregister: unregister worker
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * @reg_lock: watchdog device registration lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * @timeout: watchdog current timeout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * @dbgfs_dir: debugfs dir entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) struct mei_wdt {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct watchdog_device wdd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct mei_cl_device *cldev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) enum mei_wdt_state state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) bool resp_required;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct completion response;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) struct work_struct unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct mutex reg_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) u16 timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #if IS_ENABLED(CONFIG_DEBUG_FS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct dentry *dbgfs_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #endif /* CONFIG_DEBUG_FS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * struct mei_mc_hdr - Management Control Command Header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * @command: Management Control (0x2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * @bytecount: Number of bytes in the message beyond this byte
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) * @subcommand: Management Control Subcommand
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * @versionnumber: Management Control Version (0x10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct mei_mc_hdr {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) u8 command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) u8 bytecount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) u8 subcommand;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) u8 versionnumber;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * struct mei_wdt_start_request watchdog start/ping
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * @hdr: Management Control Command Header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * @timeout: timeout value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * @reserved: reserved (legacy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct mei_wdt_start_request {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct mei_mc_hdr hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) u16 timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) u8 reserved[17];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * struct mei_wdt_start_response watchdog start/ping response
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * @hdr: Management Control Command Header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * @status: operation status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * @wdstate: watchdog status bit mask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct mei_wdt_start_response {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct mei_mc_hdr hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) u8 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) u8 wdstate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * struct mei_wdt_stop_request - watchdog stop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * @hdr: Management Control Command Header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct mei_wdt_stop_request {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct mei_mc_hdr hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) } __packed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) * mei_wdt_ping - send wd start/ping command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * @wdt: mei watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * Return: 0 on success,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * negative errno code on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static int mei_wdt_ping(struct mei_wdt *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct mei_wdt_start_request req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) const size_t req_len = sizeof(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) memset(&req, 0, req_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) req.hdr.command = MEI_MANAGEMENT_CONTROL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) req.hdr.bytecount = req_len - offsetof(struct mei_mc_hdr, subcommand);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) req.hdr.subcommand = MEI_MC_START_WD_TIMER_REQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) req.hdr.versionnumber = MEI_MC_VERSION_NUMBER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) req.timeout = wdt->timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) ret = mei_cldev_send(wdt->cldev, (u8 *)&req, req_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * mei_wdt_stop - send wd stop command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * @wdt: mei watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * Return: 0 on success,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * negative errno code on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static int mei_wdt_stop(struct mei_wdt *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct mei_wdt_stop_request req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) const size_t req_len = sizeof(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) memset(&req, 0, req_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) req.hdr.command = MEI_MANAGEMENT_CONTROL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) req.hdr.bytecount = req_len - offsetof(struct mei_mc_hdr, subcommand);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) req.hdr.subcommand = MEI_MC_STOP_WD_TIMER_REQ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) req.hdr.versionnumber = MEI_MC_VERSION_NUMBER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) ret = mei_cldev_send(wdt->cldev, (u8 *)&req, req_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * mei_wdt_ops_start - wd start command from the watchdog core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * @wdd: watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * Return: 0 on success or -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static int mei_wdt_ops_start(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) wdt->state = MEI_WDT_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) wdd->timeout = wdt->timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * mei_wdt_ops_stop - wd stop command from the watchdog core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) * @wdd: watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) * Return: 0 if success, negative errno code for failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) static int mei_wdt_ops_stop(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (wdt->state != MEI_WDT_RUNNING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) wdt->state = MEI_WDT_STOPPING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) ret = mei_wdt_stop(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) wdt->state = MEI_WDT_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * mei_wdt_ops_ping - wd ping command from the watchdog core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * @wdd: watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * Return: 0 if success, negative errno code on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static int mei_wdt_ops_ping(struct watchdog_device *wdd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (wdt->state != MEI_WDT_START && wdt->state != MEI_WDT_RUNNING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) if (wdt->resp_required)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) init_completion(&wdt->response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) wdt->state = MEI_WDT_RUNNING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) ret = mei_wdt_ping(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (wdt->resp_required)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) ret = wait_for_completion_killable(&wdt->response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * mei_wdt_ops_set_timeout - wd set timeout command from the watchdog core.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * @wdd: watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * @timeout: timeout value to set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * Return: 0 if success, negative errno code for failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static int mei_wdt_ops_set_timeout(struct watchdog_device *wdd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) unsigned int timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) struct mei_wdt *wdt = watchdog_get_drvdata(wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /* valid value is already checked by the caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) wdt->timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) wdd->timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) static const struct watchdog_ops wd_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) .start = mei_wdt_ops_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) .stop = mei_wdt_ops_stop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) .ping = mei_wdt_ops_ping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) .set_timeout = mei_wdt_ops_set_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* not const as the firmware_version field need to be retrieved */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static struct watchdog_info wd_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) .identity = INTEL_AMT_WATCHDOG_ID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) .options = WDIOF_KEEPALIVEPING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) WDIOF_SETTIMEOUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) WDIOF_ALARMONLY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) * __mei_wdt_is_registered - check if wdt is registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * @wdt: mei watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * Return: true if the wdt is registered with the watchdog subsystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * Locking: should be called under wdt->reg_lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) static inline bool __mei_wdt_is_registered(struct mei_wdt *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return !!watchdog_get_drvdata(&wdt->wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * mei_wdt_unregister - unregister from the watchdog subsystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * @wdt: mei watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) static void mei_wdt_unregister(struct mei_wdt *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) mutex_lock(&wdt->reg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (__mei_wdt_is_registered(wdt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) watchdog_unregister_device(&wdt->wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) watchdog_set_drvdata(&wdt->wdd, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) memset(&wdt->wdd, 0, sizeof(wdt->wdd));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) mutex_unlock(&wdt->reg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * mei_wdt_register - register with the watchdog subsystem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) * @wdt: mei watchdog device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) * Return: 0 if success, negative errno code for failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static int mei_wdt_register(struct mei_wdt *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (!wdt || !wdt->cldev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) dev = &wdt->cldev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) mutex_lock(&wdt->reg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) if (__mei_wdt_is_registered(wdt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) wdt->wdd.info = &wd_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) wdt->wdd.ops = &wd_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) wdt->wdd.parent = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) wdt->wdd.timeout = MEI_WDT_DEFAULT_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) wdt->wdd.min_timeout = MEI_WDT_MIN_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) wdt->wdd.max_timeout = MEI_WDT_MAX_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) watchdog_set_drvdata(&wdt->wdd, wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) watchdog_stop_on_reboot(&wdt->wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) watchdog_stop_on_unregister(&wdt->wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) ret = watchdog_register_device(&wdt->wdd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) watchdog_set_drvdata(&wdt->wdd, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) wdt->state = MEI_WDT_IDLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) mutex_unlock(&wdt->reg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static void mei_wdt_unregister_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct mei_wdt *wdt = container_of(work, struct mei_wdt, unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) mei_wdt_unregister(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * mei_wdt_rx - callback for data receive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * @cldev: bus device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) static void mei_wdt_rx(struct mei_cl_device *cldev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct mei_wdt_start_response res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) const size_t res_len = sizeof(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) ret = mei_cldev_recv(wdt->cldev, (u8 *)&res, res_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) dev_err(&cldev->dev, "failure in recv %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) /* Empty response can be sent on stop */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (ret < sizeof(struct mei_mc_hdr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) dev_err(&cldev->dev, "recv small data %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (res.hdr.command != MEI_MANAGEMENT_CONTROL ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) res.hdr.versionnumber != MEI_MC_VERSION_NUMBER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) dev_err(&cldev->dev, "wrong command received\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) if (res.hdr.subcommand != MEI_MC_START_WD_TIMER_RES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) dev_warn(&cldev->dev, "unsupported command %d :%s[%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) res.hdr.subcommand,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) mei_wdt_state_str(wdt->state),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) wdt->state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) /* Run the unregistration in a worker as this can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) * run only after ping completion, otherwise the flow will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) * deadlock on watchdog core mutex.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (wdt->state == MEI_WDT_RUNNING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (res.wdstate & MEI_WDT_WDSTATE_NOT_REQUIRED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) wdt->state = MEI_WDT_NOT_REQUIRED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) schedule_work(&wdt->unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (wdt->state == MEI_WDT_PROBE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (res.wdstate & MEI_WDT_WDSTATE_NOT_REQUIRED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) wdt->state = MEI_WDT_NOT_REQUIRED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) /* stop the watchdog and register watchdog device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) mei_wdt_stop(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) mei_wdt_register(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) dev_warn(&cldev->dev, "not in correct state %s[%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) mei_wdt_state_str(wdt->state), wdt->state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (!completion_done(&wdt->response))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) complete(&wdt->response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * mei_wdt_notif - callback for event notification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) * @cldev: bus device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) static void mei_wdt_notif(struct mei_cl_device *cldev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (wdt->state != MEI_WDT_NOT_REQUIRED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) mei_wdt_register(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) #if IS_ENABLED(CONFIG_DEBUG_FS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) static ssize_t mei_dbgfs_read_activation(struct file *file, char __user *ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) size_t cnt, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) struct mei_wdt *wdt = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) const size_t bufsz = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) char buf[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) ssize_t pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) mutex_lock(&wdt->reg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) pos = scnprintf(buf, bufsz, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) __mei_wdt_is_registered(wdt) ? "activated" : "deactivated");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) mutex_unlock(&wdt->reg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) static const struct file_operations dbgfs_fops_activation = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) .open = simple_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) .read = mei_dbgfs_read_activation,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) .llseek = generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) static ssize_t mei_dbgfs_read_state(struct file *file, char __user *ubuf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) size_t cnt, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) struct mei_wdt *wdt = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) char buf[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) ssize_t pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) pos = scnprintf(buf, sizeof(buf), "state: %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) mei_wdt_state_str(wdt->state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) return simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) static const struct file_operations dbgfs_fops_state = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) .open = simple_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) .read = mei_dbgfs_read_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) .llseek = generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) static void dbgfs_unregister(struct mei_wdt *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) debugfs_remove_recursive(wdt->dbgfs_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) wdt->dbgfs_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) static void dbgfs_register(struct mei_wdt *wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) struct dentry *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) wdt->dbgfs_dir = dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) debugfs_create_file("state", S_IRUSR, dir, wdt, &dbgfs_fops_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) debugfs_create_file("activation", S_IRUSR, dir, wdt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) &dbgfs_fops_activation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) static inline void dbgfs_unregister(struct mei_wdt *wdt) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) static inline void dbgfs_register(struct mei_wdt *wdt) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) #endif /* CONFIG_DEBUG_FS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) static int mei_wdt_probe(struct mei_cl_device *cldev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) const struct mei_cl_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) struct mei_wdt *wdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) wdt = kzalloc(sizeof(struct mei_wdt), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (!wdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) wdt->timeout = MEI_WDT_DEFAULT_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) wdt->state = MEI_WDT_PROBE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) wdt->cldev = cldev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) wdt->resp_required = mei_cldev_ver(cldev) > 0x1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) mutex_init(&wdt->reg_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) init_completion(&wdt->response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) INIT_WORK(&wdt->unregister, mei_wdt_unregister_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) mei_cldev_set_drvdata(cldev, wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) ret = mei_cldev_enable(cldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) dev_err(&cldev->dev, "Could not enable cl device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) goto err_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) ret = mei_cldev_register_rx_cb(wdt->cldev, mei_wdt_rx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) dev_err(&cldev->dev, "Could not reg rx event ret=%d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) goto err_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) ret = mei_cldev_register_notif_cb(wdt->cldev, mei_wdt_notif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) /* on legacy devices notification is not supported
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (ret && ret != -EOPNOTSUPP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) dev_err(&cldev->dev, "Could not reg notif event ret=%d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) goto err_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) wd_info.firmware_version = mei_cldev_ver(cldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) if (wdt->resp_required)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) ret = mei_wdt_ping(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) ret = mei_wdt_register(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) goto err_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) dbgfs_register(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) err_disable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) mei_cldev_disable(cldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) err_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) kfree(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) static int mei_wdt_remove(struct mei_cl_device *cldev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) /* Free the caller in case of fw initiated or unexpected reset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) if (!completion_done(&wdt->response))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) complete(&wdt->response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) cancel_work_sync(&wdt->unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) mei_wdt_unregister(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) mei_cldev_disable(cldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) dbgfs_unregister(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) kfree(wdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) 0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) static const struct mei_cl_device_id mei_wdt_tbl[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) { .uuid = MEI_UUID_WD, .version = MEI_CL_VERSION_ANY },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) /* required last entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) MODULE_DEVICE_TABLE(mei, mei_wdt_tbl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) static struct mei_cl_driver mei_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) .id_table = mei_wdt_tbl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) .name = KBUILD_MODNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) .probe = mei_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) .remove = mei_wdt_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) module_mei_cl_driver(mei_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) MODULE_AUTHOR("Intel Corporation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) MODULE_DESCRIPTION("Device driver for Intel MEI iAMT watchdog");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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