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drivers/remoteproc/qcom_sysmon.c
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// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2017, Linaro Ltd. */ #include <linux/firmware.h> #include <linux/module.h> #include <linux/notifier.h> #include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/of_irq.h> |
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#include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/remoteproc/qcom_rproc.h> #include <linux/rpmsg.h> #include "qcom_common.h" static BLOCKING_NOTIFIER_HEAD(sysmon_notifiers); struct qcom_sysmon { struct rproc_subdev subdev; struct rproc *rproc; struct list_head node; const char *name; |
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int shutdown_irq; |
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int ssctl_version; int ssctl_instance; struct notifier_block nb; struct device *dev; struct rpmsg_endpoint *ept; struct completion comp; |
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struct completion ind_comp; |
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struct completion shutdown_comp; |
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struct mutex lock; bool ssr_ack; struct qmi_handle qmi; struct sockaddr_qrtr ssctl; }; static DEFINE_MUTEX(sysmon_lock); static LIST_HEAD(sysmon_list); /** * sysmon_send_event() - send notification of other remote's SSR event * @sysmon: sysmon context * @name: other remote's name */ static void sysmon_send_event(struct qcom_sysmon *sysmon, const char *name) { char req[50]; int len; int ret; len = snprintf(req, sizeof(req), "ssr:%s:before_shutdown", name); if (len >= sizeof(req)) return; mutex_lock(&sysmon->lock); reinit_completion(&sysmon->comp); sysmon->ssr_ack = false; ret = rpmsg_send(sysmon->ept, req, len); if (ret < 0) { dev_err(sysmon->dev, "failed to send sysmon event "); goto out_unlock; } ret = wait_for_completion_timeout(&sysmon->comp, msecs_to_jiffies(5000)); if (!ret) { dev_err(sysmon->dev, "timeout waiting for sysmon ack "); goto out_unlock; } if (!sysmon->ssr_ack) dev_err(sysmon->dev, "unexpected response to sysmon event "); out_unlock: mutex_unlock(&sysmon->lock); } /** * sysmon_request_shutdown() - request graceful shutdown of remote * @sysmon: sysmon context */ static void sysmon_request_shutdown(struct qcom_sysmon *sysmon) { char *req = "ssr:shutdown"; int ret; mutex_lock(&sysmon->lock); reinit_completion(&sysmon->comp); sysmon->ssr_ack = false; ret = rpmsg_send(sysmon->ept, req, strlen(req) + 1); if (ret < 0) { dev_err(sysmon->dev, "send sysmon shutdown request failed "); goto out_unlock; } ret = wait_for_completion_timeout(&sysmon->comp, msecs_to_jiffies(5000)); if (!ret) { dev_err(sysmon->dev, "timeout waiting for sysmon ack "); goto out_unlock; } if (!sysmon->ssr_ack) dev_err(sysmon->dev, "unexpected response to sysmon shutdown request "); out_unlock: mutex_unlock(&sysmon->lock); } static int sysmon_callback(struct rpmsg_device *rpdev, void *data, int count, void *priv, u32 addr) { struct qcom_sysmon *sysmon = priv; const char *ssr_ack = "ssr:ack"; const int ssr_ack_len = strlen(ssr_ack) + 1; if (!sysmon) return -EINVAL; if (count >= ssr_ack_len && !memcmp(data, ssr_ack, ssr_ack_len)) sysmon->ssr_ack = true; complete(&sysmon->comp); return 0; } #define SSCTL_SHUTDOWN_REQ 0x21 |
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#define SSCTL_SHUTDOWN_READY_IND 0x21 |
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#define SSCTL_SUBSYS_EVENT_REQ 0x23 #define SSCTL_MAX_MSG_LEN 7 #define SSCTL_SUBSYS_NAME_LENGTH 15 enum { SSCTL_SSR_EVENT_BEFORE_POWERUP, SSCTL_SSR_EVENT_AFTER_POWERUP, SSCTL_SSR_EVENT_BEFORE_SHUTDOWN, SSCTL_SSR_EVENT_AFTER_SHUTDOWN, }; enum { SSCTL_SSR_EVENT_FORCED, SSCTL_SSR_EVENT_GRACEFUL, }; struct ssctl_shutdown_resp { struct qmi_response_type_v01 resp; }; static struct qmi_elem_info ssctl_shutdown_resp_ei[] = { { .data_type = QMI_STRUCT, .elem_len = 1, .elem_size = sizeof(struct qmi_response_type_v01), .array_type = NO_ARRAY, .tlv_type = 0x02, .offset = offsetof(struct ssctl_shutdown_resp, resp), .ei_array = qmi_response_type_v01_ei, }, {} }; struct ssctl_subsys_event_req { u8 subsys_name_len; char subsys_name[SSCTL_SUBSYS_NAME_LENGTH]; u32 event; u8 evt_driven_valid; u32 evt_driven; }; static struct qmi_elem_info ssctl_subsys_event_req_ei[] = { { .data_type = QMI_DATA_LEN, .elem_len = 1, .elem_size = sizeof(uint8_t), .array_type = NO_ARRAY, .tlv_type = 0x01, .offset = offsetof(struct ssctl_subsys_event_req, subsys_name_len), .ei_array = NULL, }, { .data_type = QMI_UNSIGNED_1_BYTE, .elem_len = SSCTL_SUBSYS_NAME_LENGTH, .elem_size = sizeof(char), .array_type = VAR_LEN_ARRAY, .tlv_type = 0x01, .offset = offsetof(struct ssctl_subsys_event_req, subsys_name), .ei_array = NULL, }, { .data_type = QMI_SIGNED_4_BYTE_ENUM, .elem_len = 1, .elem_size = sizeof(uint32_t), .array_type = NO_ARRAY, .tlv_type = 0x02, .offset = offsetof(struct ssctl_subsys_event_req, event), .ei_array = NULL, }, { .data_type = QMI_OPT_FLAG, .elem_len = 1, .elem_size = sizeof(uint8_t), .array_type = NO_ARRAY, .tlv_type = 0x10, .offset = offsetof(struct ssctl_subsys_event_req, evt_driven_valid), .ei_array = NULL, }, { .data_type = QMI_SIGNED_4_BYTE_ENUM, .elem_len = 1, .elem_size = sizeof(uint32_t), .array_type = NO_ARRAY, .tlv_type = 0x10, .offset = offsetof(struct ssctl_subsys_event_req, evt_driven), .ei_array = NULL, }, {} }; struct ssctl_subsys_event_resp { struct qmi_response_type_v01 resp; }; static struct qmi_elem_info ssctl_subsys_event_resp_ei[] = { { .data_type = QMI_STRUCT, .elem_len = 1, .elem_size = sizeof(struct qmi_response_type_v01), .array_type = NO_ARRAY, .tlv_type = 0x02, .offset = offsetof(struct ssctl_subsys_event_resp, resp), .ei_array = qmi_response_type_v01_ei, }, {} }; |
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static struct qmi_elem_info ssctl_shutdown_ind_ei[] = { {} }; static void sysmon_ind_cb(struct qmi_handle *qmi, struct sockaddr_qrtr *sq, struct qmi_txn *txn, const void *data) { struct qcom_sysmon *sysmon = container_of(qmi, struct qcom_sysmon, qmi); complete(&sysmon->ind_comp); } static struct qmi_msg_handler qmi_indication_handler[] = { { .type = QMI_INDICATION, .msg_id = SSCTL_SHUTDOWN_READY_IND, .ei = ssctl_shutdown_ind_ei, .decoded_size = 0, .fn = sysmon_ind_cb }, {} }; |
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/** * ssctl_request_shutdown() - request shutdown via SSCTL QMI service * @sysmon: sysmon context */ static void ssctl_request_shutdown(struct qcom_sysmon *sysmon) { struct ssctl_shutdown_resp resp; struct qmi_txn txn; int ret; |
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reinit_completion(&sysmon->ind_comp); reinit_completion(&sysmon->shutdown_comp); |
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ret = qmi_txn_init(&sysmon->qmi, &txn, ssctl_shutdown_resp_ei, &resp); if (ret < 0) { dev_err(sysmon->dev, "failed to allocate QMI txn "); return; } ret = qmi_send_request(&sysmon->qmi, &sysmon->ssctl, &txn, SSCTL_SHUTDOWN_REQ, 0, NULL, NULL); if (ret < 0) { dev_err(sysmon->dev, "failed to send shutdown request "); qmi_txn_cancel(&txn); return; } ret = qmi_txn_wait(&txn, 5 * HZ); if (ret < 0) dev_err(sysmon->dev, "failed receiving QMI response "); else if (resp.resp.result) dev_err(sysmon->dev, "shutdown request failed "); else dev_dbg(sysmon->dev, "shutdown request completed "); |
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if (sysmon->shutdown_irq > 0) { ret = wait_for_completion_timeout(&sysmon->shutdown_comp, 10 * HZ); if (!ret) { ret = try_wait_for_completion(&sysmon->ind_comp); if (!ret) dev_err(sysmon->dev, "timeout waiting for shutdown ack "); } } |
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} /** * ssctl_send_event() - send notification of other remote's SSR event * @sysmon: sysmon context * @name: other remote's name */ static void ssctl_send_event(struct qcom_sysmon *sysmon, const char *name) { struct ssctl_subsys_event_resp resp; struct ssctl_subsys_event_req req; struct qmi_txn txn; int ret; memset(&resp, 0, sizeof(resp)); ret = qmi_txn_init(&sysmon->qmi, &txn, ssctl_subsys_event_resp_ei, &resp); if (ret < 0) { dev_err(sysmon->dev, "failed to allocate QMI txn "); return; } memset(&req, 0, sizeof(req)); strlcpy(req.subsys_name, name, sizeof(req.subsys_name)); req.subsys_name_len = strlen(req.subsys_name); req.event = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN; req.evt_driven_valid = true; req.evt_driven = SSCTL_SSR_EVENT_FORCED; ret = qmi_send_request(&sysmon->qmi, &sysmon->ssctl, &txn, SSCTL_SUBSYS_EVENT_REQ, 40, ssctl_subsys_event_req_ei, &req); if (ret < 0) { dev_err(sysmon->dev, "failed to send shutdown request "); qmi_txn_cancel(&txn); return; } ret = qmi_txn_wait(&txn, 5 * HZ); if (ret < 0) dev_err(sysmon->dev, "failed receiving QMI response "); else if (resp.resp.result) dev_err(sysmon->dev, "ssr event send failed "); else dev_dbg(sysmon->dev, "ssr event send completed "); } /** * ssctl_new_server() - QMI callback indicating a new service * @qmi: QMI handle * @svc: service information * * Return: 0 if we're interested in this service, -EINVAL otherwise. */ static int ssctl_new_server(struct qmi_handle *qmi, struct qmi_service *svc) { struct qcom_sysmon *sysmon = container_of(qmi, struct qcom_sysmon, qmi); switch (svc->version) { case 1: if (svc->instance != 0) return -EINVAL; if (strcmp(sysmon->name, "modem")) return -EINVAL; break; case 2: if (svc->instance != sysmon->ssctl_instance) return -EINVAL; break; default: return -EINVAL; }; sysmon->ssctl_version = svc->version; sysmon->ssctl.sq_family = AF_QIPCRTR; sysmon->ssctl.sq_node = svc->node; sysmon->ssctl.sq_port = svc->port; svc->priv = sysmon; return 0; } /** * ssctl_del_server() - QMI callback indicating that @svc is removed * @qmi: QMI handle * @svc: service information */ static void ssctl_del_server(struct qmi_handle *qmi, struct qmi_service *svc) { struct qcom_sysmon *sysmon = svc->priv; sysmon->ssctl_version = 0; } static const struct qmi_ops ssctl_ops = { .new_server = ssctl_new_server, .del_server = ssctl_del_server, }; static int sysmon_start(struct rproc_subdev *subdev) { return 0; } static void sysmon_stop(struct rproc_subdev *subdev, bool crashed) { struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, subdev); blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)sysmon->name); /* Don't request graceful shutdown if we've crashed */ if (crashed) return; if (sysmon->ssctl_version) ssctl_request_shutdown(sysmon); else if (sysmon->ept) sysmon_request_shutdown(sysmon); } /** * sysmon_notify() - notify sysmon target of another's SSR * @nb: notifier_block associated with sysmon instance * @event: unused * @data: SSR identifier of the remote that is going down */ static int sysmon_notify(struct notifier_block *nb, unsigned long event, void *data) { struct qcom_sysmon *sysmon = container_of(nb, struct qcom_sysmon, nb); struct rproc *rproc = sysmon->rproc; const char *ssr_name = data; /* Skip non-running rprocs and the originating instance */ if (rproc->state != RPROC_RUNNING || !strcmp(data, sysmon->name)) { dev_dbg(sysmon->dev, "not notifying %s ", sysmon->name); return NOTIFY_DONE; } /* Only SSCTL version 2 supports SSR events */ if (sysmon->ssctl_version == 2) ssctl_send_event(sysmon, ssr_name); else if (sysmon->ept) sysmon_send_event(sysmon, ssr_name); return NOTIFY_DONE; } |
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static irqreturn_t sysmon_shutdown_interrupt(int irq, void *data) { struct qcom_sysmon *sysmon = data; complete(&sysmon->shutdown_comp); return IRQ_HANDLED; } |
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/** * qcom_add_sysmon_subdev() - create a sysmon subdev for the given remoteproc * @rproc: rproc context to associate the subdev with * @name: name of this subdev, to use in SSR * @ssctl_instance: instance id of the ssctl QMI service * * Return: A new qcom_sysmon object, or NULL on failure */ struct qcom_sysmon *qcom_add_sysmon_subdev(struct rproc *rproc, const char *name, int ssctl_instance) { struct qcom_sysmon *sysmon; int ret; sysmon = kzalloc(sizeof(*sysmon), GFP_KERNEL); if (!sysmon) |
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return ERR_PTR(-ENOMEM); |
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sysmon->dev = rproc->dev.parent; sysmon->rproc = rproc; sysmon->name = name; sysmon->ssctl_instance = ssctl_instance; init_completion(&sysmon->comp); |
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init_completion(&sysmon->ind_comp); |
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init_completion(&sysmon->shutdown_comp); |
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mutex_init(&sysmon->lock); |
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sysmon->shutdown_irq = of_irq_get_byname(sysmon->dev->of_node, "shutdown-ack"); if (sysmon->shutdown_irq < 0) { if (sysmon->shutdown_irq != -ENODATA) { dev_err(sysmon->dev, "failed to retrieve shutdown-ack IRQ "); return ERR_PTR(sysmon->shutdown_irq); } } else { ret = devm_request_threaded_irq(sysmon->dev, sysmon->shutdown_irq, NULL, sysmon_shutdown_interrupt, IRQF_TRIGGER_RISING | IRQF_ONESHOT, "q6v5 shutdown-ack", sysmon); if (ret) { dev_err(sysmon->dev, "failed to acquire shutdown-ack IRQ "); return ERR_PTR(ret); } } |
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ret = qmi_handle_init(&sysmon->qmi, SSCTL_MAX_MSG_LEN, &ssctl_ops, qmi_indication_handler); |
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if (ret < 0) { dev_err(sysmon->dev, "failed to initialize qmi handle "); kfree(sysmon); |
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return ERR_PTR(ret); |
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} qmi_add_lookup(&sysmon->qmi, 43, 0, 0); |
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sysmon->subdev.start = sysmon_start; sysmon->subdev.stop = sysmon_stop; rproc_add_subdev(rproc, &sysmon->subdev); |
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sysmon->nb.notifier_call = sysmon_notify; blocking_notifier_chain_register(&sysmon_notifiers, &sysmon->nb); mutex_lock(&sysmon_lock); list_add(&sysmon->node, &sysmon_list); mutex_unlock(&sysmon_lock); return sysmon; } EXPORT_SYMBOL_GPL(qcom_add_sysmon_subdev); /** * qcom_remove_sysmon_subdev() - release a qcom_sysmon * @sysmon: sysmon context, as retrieved by qcom_add_sysmon_subdev() */ void qcom_remove_sysmon_subdev(struct qcom_sysmon *sysmon) { if (!sysmon) return; mutex_lock(&sysmon_lock); list_del(&sysmon->node); mutex_unlock(&sysmon_lock); blocking_notifier_chain_unregister(&sysmon_notifiers, &sysmon->nb); rproc_remove_subdev(sysmon->rproc, &sysmon->subdev); qmi_handle_release(&sysmon->qmi); kfree(sysmon); } EXPORT_SYMBOL_GPL(qcom_remove_sysmon_subdev); /** * sysmon_probe() - probe sys_mon channel * @rpdev: rpmsg device handle * * Find the sysmon context associated with the ancestor remoteproc and assign * this rpmsg device with said sysmon context. * * Return: 0 on success, negative errno on failure. */ static int sysmon_probe(struct rpmsg_device *rpdev) { struct qcom_sysmon *sysmon; struct rproc *rproc; rproc = rproc_get_by_child(&rpdev->dev); if (!rproc) { dev_err(&rpdev->dev, "sysmon device not child of rproc "); return -EINVAL; } mutex_lock(&sysmon_lock); list_for_each_entry(sysmon, &sysmon_list, node) { if (sysmon->rproc == rproc) goto found; } mutex_unlock(&sysmon_lock); dev_err(&rpdev->dev, "no sysmon associated with parent rproc "); return -EINVAL; found: mutex_unlock(&sysmon_lock); rpdev->ept->priv = sysmon; sysmon->ept = rpdev->ept; return 0; } /** * sysmon_remove() - sys_mon channel remove handler * @rpdev: rpmsg device handle * * Disassociate the rpmsg device with the sysmon instance. */ static void sysmon_remove(struct rpmsg_device *rpdev) { struct qcom_sysmon *sysmon = rpdev->ept->priv; sysmon->ept = NULL; } static const struct rpmsg_device_id sysmon_match[] = { { "sys_mon" }, {} }; static struct rpmsg_driver sysmon_driver = { .probe = sysmon_probe, .remove = sysmon_remove, .callback = sysmon_callback, .id_table = sysmon_match, .drv = { .name = "qcom_sysmon", }, }; module_rpmsg_driver(sysmon_driver); MODULE_DESCRIPTION("Qualcomm sysmon driver"); MODULE_LICENSE("GPL v2"); |