Qualcomm SoCs (starting with MSM8998) allow for multiple protection domains
to run on the same Q6 sub-system. This allows for services like ATH10K WLAN
FW to have their own separate address space and crash/recover without
disrupting the modem and other PDs running on the same sub-system. The PDR
helpers introduces an abstraction that allows for tracking/controlling the
life cycle of protection domains running on various Q6 sub-systems.
Signed-off-by: Sibi Sankar <sibis@xxxxxxxxxxxxxx>
---
drivers/soc/qcom/Kconfig | 5 +
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/pdr_interface.c | 709 +++++++++++++++++++++++++++++++
drivers/soc/qcom/pdr_internal.h | 375 ++++++++++++++++
include/linux/soc/qcom/pdr.h | 109 +++++
include/linux/soc/qcom/qmi.h | 1 +
6 files changed, 1200 insertions(+)
create mode 100644 drivers/soc/qcom/pdr_interface.c
create mode 100644 drivers/soc/qcom/pdr_internal.h
create mode 100644 include/linux/soc/qcom/pdr.h
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 79d826553ac82..5c4e76837f59b 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -76,6 +76,11 @@ config QCOM_OCMEM
requirements. This is typically used by the GPU, camera/video, and
audio components on some Snapdragon SoCs.
+config QCOM_PDR_HELPERS
+ tristate
+ depends on ARCH_QCOM || COMPILE_TEST
+ select QCOM_QMI_HELPERS
+
config QCOM_PM
bool "Qualcomm Power Management"
depends on ARCH_QCOM && !ARM64
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 9fb35c8a495e1..5d6b83dc58e82 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o
obj-$(CONFIG_QCOM_OCMEM) += ocmem.o
+obj-$(CONFIG_QCOM_PDR_HELPERS) += pdr_interface.o
obj-$(CONFIG_QCOM_PM) += spm.o
obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o
qmi_helpers-y += qmi_encdec.o qmi_interface.o
diff --git a/drivers/soc/qcom/pdr_interface.c b/drivers/soc/qcom/pdr_interface.c
new file mode 100644
index 0000000000000..27b74763add05
--- /dev/null
+++ b/drivers/soc/qcom/pdr_interface.c
@@ -0,0 +1,709 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/completion.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/qrtr.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+
+#include "pdr_internal.h"
+
+struct pdr_list_node {
+ enum servreg_service_state curr_state;
+ u16 transaction_id;
+ struct pdr_service *pds;
+ struct list_head node;
+};
+
+static int servreg_locator_new_server(struct qmi_handle *qmi,
+ struct qmi_service *svc)
+{
+ struct pdr_handle *pdr = container_of(qmi, struct pdr_handle,
+ servloc_client);
+ struct pdr_service *pds, *tmp;
+
+ /* Create a Local client port for QMI communication */
+ pdr->servloc_addr.sq_family = AF_QIPCRTR;
+ pdr->servloc_addr.sq_node = svc->node;
+ pdr->servloc_addr.sq_port = svc->port;
+
+ mutex_lock(&pdr->locator_lock);
+ pdr->locator_available = true;
+ mutex_unlock(&pdr->locator_lock);
+
+ /* Service pending lookup requests */
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds, tmp, &pdr->lookups, node) {
+ if (pds->need_servreg_lookup)
+ schedule_work(&pdr->servloc_work);
+ }
+ mutex_unlock(&pdr->list_lock);
+
+ return 0;
+}
+
+static void servreg_locator_del_server(struct qmi_handle *qmi,
+ struct qmi_service *svc)
+{
+ struct pdr_handle *pdr = container_of(qmi, struct pdr_handle,
+ servloc_client);
+
+ mutex_lock(&pdr->locator_lock);
+ pdr->locator_available = false;
+ mutex_unlock(&pdr->locator_lock);
+
+ pdr->servloc_addr.sq_node = 0;
+ pdr->servloc_addr.sq_port = 0;
+}
+
+static struct qmi_ops service_locator_ops = {
+ .new_server = servreg_locator_new_server,
+ .del_server = servreg_locator_del_server,
+};
+
+static int pdr_register_listener(struct pdr_handle *pdr,
+ struct pdr_service *pds,
+ bool enable)
+{
+ struct servreg_register_listener_resp resp;
+ struct servreg_register_listener_req req;
+ struct qmi_txn txn;
+ int ret;
+
+ ret = qmi_txn_init(&pdr->servreg_client, &txn,
+ servreg_register_listener_resp_ei,
+ &resp);
+ if (ret < 0)
+ return ret;
+
+ req.enable = enable;
+ strcpy(req.service_path, pds->service_path);
+
+ ret = qmi_send_request(&pdr->servreg_client, &pdr->servreg_addr,
+ &txn, SERVREG_REGISTER_LISTENER_REQ,
+ SERVREG_REGISTER_LISTENER_REQ_LEN,
+ servreg_register_listener_req_ei,
+ &req);
+ if (ret < 0) {
+ qmi_txn_cancel(&txn);
+ return ret;
+ }
+
+ ret = qmi_txn_wait(&txn, 5 * HZ);
+ if (ret < 0) {
+ pr_err("PDR: %s register listener txn wait failed: %d\n",
+ pds->service_path, ret);
+ return ret;
+ }
+
+ /* Check the response */
+ if (resp.resp.result != QMI_RESULT_SUCCESS_V01) {
+ pr_err("PDR: %s register listener failed: 0x%x\n",
+ pds->service_path, resp.resp.error);
+ return ret;
+ }
+
+ if ((int)resp.curr_state < INT_MIN || (int)resp.curr_state > INT_MAX)
+ pr_err("PDR: %s notification state invalid: 0x%x\n",
+ pds->service_path, resp.curr_state);
+
+ pds->state = resp.curr_state;
+
+ return 0;
+}
+
+static void pdr_servreg_work(struct work_struct *work)
+{
+ struct pdr_handle *pdr = container_of(work, struct pdr_handle,
+ servreg_work);
+ struct pdr_service *pds, *tmp;
+
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds, tmp, &pdr->lookups, node) {
+ if (pds->service_connected) {
+ if (!pds->need_servreg_register)
+ continue;
+
+ pds->need_servreg_register = false;
+ mutex_unlock(&pdr->list_lock);
+ pdr_register_listener(pdr, pds, true);
+ } else {
+ if (!pds->need_servreg_remove)
+ continue;
+
+ pds->need_servreg_remove = false;
+ mutex_unlock(&pdr->list_lock);
+ pds->state = SERVREG_SERVICE_STATE_DOWN;
+ }
+
+ mutex_lock(&pdr->status_lock);
+ pdr->status(pdr, pds);
+ mutex_unlock(&pdr->status_lock);
+
+ return;
+ }
+ mutex_unlock(&pdr->list_lock);
+}
+
+static int servreg_notifier_new_server(struct qmi_handle *qmi,
+ struct qmi_service *svc)
+{
+ struct pdr_handle *pdr = container_of(qmi, struct pdr_handle,
+ servreg_client);
+ struct pdr_service *pds, *tmp;
+
+ /* Create a Local client port for QMI communication */
+ pdr->servreg_addr.sq_family = AF_QIPCRTR;
+ pdr->servreg_addr.sq_node = svc->node;
+ pdr->servreg_addr.sq_port = svc->port;
+
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds, tmp, &pdr->lookups, node) {
+ if (pds->service == svc->service &&
+ pds->instance == svc->instance) {
+ pds->service_connected = true;
+ pds->need_servreg_register = true;
+ queue_work(pdr->servreg_wq, &pdr->servreg_work);
+ }
+ }
+ mutex_unlock(&pdr->list_lock);
+
+ return 0;
+}
+
+static void servreg_notifier_del_server(struct qmi_handle *qmi,
+ struct qmi_service *svc)
+{
+ struct pdr_handle *pdr = container_of(qmi, struct pdr_handle,
+ servreg_client);
+ struct pdr_service *pds, *tmp;
+
+ pdr->servreg_addr.sq_node = 0;
+ pdr->servreg_addr.sq_port = 0;
+
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds, tmp, &pdr->lookups, node) {
+ if (pds->service == svc->service &&
+ pds->instance == svc->instance) {
+ pds->service_connected = false;
+ pds->need_servreg_remove = true;
+ queue_work(pdr->servreg_wq, &pdr->servreg_work);
+ }
+ }
+ mutex_unlock(&pdr->list_lock);
+}
+
+static struct qmi_ops service_notifier_ops = {
+ .new_server = servreg_notifier_new_server,
+ .del_server = servreg_notifier_del_server,
+};
+
+static int pdr_send_indack_msg(struct pdr_handle *pdr, struct pdr_service *pds,
+ u16 tid)
+{
+ struct servreg_set_ack_resp resp;
+ struct servreg_set_ack_req req;
+ struct qmi_txn txn;
+ int ret;
+
+ ret = qmi_txn_init(&pdr->servreg_client, &txn, servreg_set_ack_resp_ei,
+ &resp);
+ if (ret < 0)
+ return ret;
+
+ req.transaction_id = tid;
+ strcpy(req.service_path, pds->service_path);
+
+ ret = qmi_send_request(&pdr->servreg_client, &pdr->servreg_addr,
+ &txn, SERVREG_SET_ACK_REQ,
+ SERVREG_SET_ACK_REQ_LEN,
+ servreg_set_ack_req_ei,
+ &req);
+
+ /* Skip waiting for response */
+ qmi_txn_cancel(&txn);
+ return ret;
+}
+
+static void pdr_indack_work(struct work_struct *work)
+{
+ struct pdr_handle *pdr = container_of(work, struct pdr_handle,
+ indack_work);
+ struct pdr_list_node *ind, *tmp;
+ struct pdr_service *pds;
+
+ list_for_each_entry_safe(ind, tmp, &pdr->indack_list, node) {
+ pds = ind->pds;
+ pdr_send_indack_msg(pdr, pds, ind->transaction_id);
+ mutex_lock(&pdr->status_lock);
+ pds->state = ind->curr_state;
+ pdr->status(pdr, pds);
+ mutex_unlock(&pdr->status_lock);
+ list_del(&ind->node);
+ kfree(ind);
+ }
+}
+
+static void pdr_servreg_ind_cb(struct qmi_handle *qmi,
+ struct sockaddr_qrtr *sq,
+ struct qmi_txn *txn, const void *data)
+{
+ struct pdr_handle *pdr = container_of(qmi, struct pdr_handle,
+ servreg_client);
+ const struct servreg_state_updated_ind *ind_msg = data;
+ struct pdr_list_node *ind;
+ struct pdr_service *pds;
+
+ if (!ind_msg || !ind_msg->service_path[0] ||
+ strlen(ind_msg->service_path) > SERVREG_NAME_LENGTH)
+ return;
+
+ list_for_each_entry(pds, &pdr->lookups, node) {
+ if (!strcmp(pds->service_path, ind_msg->service_path))
+ goto found;
+ }
+ return;
+
+found:
+ ind = kzalloc(sizeof(*ind), GFP_KERNEL);
+ if (!ind)
+ return;
+
+ pr_info("PDR: Indication received from %s, state: 0x%x, trans-id: %d\n",
+ ind_msg->service_path, ind_msg->curr_state,
+ ind_msg->transaction_id);
+
+ ind->transaction_id = ind_msg->transaction_id;
+ ind->curr_state = ind_msg->curr_state;
+ ind->pds = pds;
+
+ mutex_lock(&pdr->list_lock);
+ list_add_tail(&ind->node, &pdr->indack_list);
+ mutex_unlock(&pdr->list_lock);
+
+ queue_work(pdr->indack_wq, &pdr->indack_work);
+}
+
+static struct qmi_msg_handler qmi_indication_handler[] = {
+ {
+ .type = QMI_INDICATION,
+ .msg_id = SERVREG_STATE_UPDATED_IND_ID,
+ .ei = servreg_state_updated_ind_ei,
+ .decoded_size = sizeof(struct servreg_state_updated_ind),
+ .fn = pdr_servreg_ind_cb,
+ },
+ {}
+};
+
+static int pdr_get_domain_list(struct servreg_get_domain_list_req *req,
+ struct servreg_get_domain_list_resp *resp,
+ struct pdr_handle *pdr)
+{
+ struct qmi_txn txn;
+ int ret;
+
+ ret = qmi_txn_init(&pdr->servloc_client, &txn,
+ servreg_get_domain_list_resp_ei, resp);
+ if (ret < 0)
+ return ret;
+
+ ret = qmi_send_request(&pdr->servloc_client,
+ &pdr->servloc_addr,
+ &txn, SERVREG_GET_DOMAIN_LIST_REQ,
+ SERVREG_GET_DOMAIN_LIST_REQ_MAX_LEN,
+ servreg_get_domain_list_req_ei,
+ req);
+ if (ret < 0) {
+ qmi_txn_cancel(&txn);
+ return ret;
+ }
+
+ ret = qmi_txn_wait(&txn, 5 * HZ);
+ if (ret < 0) {
+ pr_err("PDR: %s get domain list txn wait failed: %d\n",
+ req->service_name, ret);
+ return ret;
+ }
+
+ /* Check the response */
+ if (resp->resp.result != QMI_RESULT_SUCCESS_V01) {
+ pr_err("PDR: %s get domain list failed: 0x%x\n",
+ req->service_name, resp->resp.error);
+ return -EREMOTEIO;
+ }
+
+ return 0;
+}
+
+static void pdr_servreg_link_create(struct pdr_handle *pdr,
+ struct pdr_service *pds)
+{
+ struct pdr_service *pds_iter, *tmp;
+ bool link_exists = false;
+
+ /* Check if a QMI link to SERVREG instance already exists */
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds_iter, tmp, &pdr->lookups, node) {
+ if (pds_iter->instance == pds->instance &&
+ strcmp(pds_iter->service_path, pds->service_path)) {
+ link_exists = true;
+ pds->service_connected = pds_iter->service_connected;
+ if (pds_iter->service_connected)
+ pds->need_servreg_register = true;
+ else
+ pds->need_servreg_remove = true;
+ queue_work(pdr->servreg_wq, &pdr->servreg_work);
+ break;
+ }
+ }
+ mutex_unlock(&pdr->list_lock);
+
+ if (!link_exists)
+ qmi_add_lookup(&pdr->servreg_client, pds->service, 1,
+ pds->instance);
+}
+
+static int pdr_locate_service(struct pdr_handle *pdr, struct pdr_service *pds)
+{
+ struct servreg_get_domain_list_resp *resp = NULL;
+ struct servreg_get_domain_list_req req;
+ int db_rev_count = 0, domains_read = 0;
+ struct servreg_location_entry *entry;
+ int ret, i;
+
+ resp = kzalloc(sizeof(*resp), GFP_KERNEL);
+ if (!resp)
+ return -ENOMEM;
+
+ /* Prepare req message */
+ strcpy(req.service_name, pds->service_name);
+ req.domain_offset_valid = true;
+ req.domain_offset = 0;
+
+ do {
+ req.domain_offset = domains_read;
+ ret = pdr_get_domain_list(&req, resp, pdr);
+ if (ret < 0)
+ goto out;
+
+ if (!domains_read)
+ db_rev_count = resp->db_rev_count;
+
+ if (db_rev_count != resp->db_rev_count) {
+ ret = -EAGAIN;
+ goto out;
+ }
+
+ for (i = domains_read; i < resp->domain_list_len; i++) {
+ entry = &resp->domain_list[i];
+
+ if (strnlen(entry->name, sizeof(entry->name)) == sizeof(entry->name))
+ continue;
+
+ if (!strcmp(entry->name, pds->service_path)) {
+ pds->service_data_valid = entry->service_data_valid;
+ pds->service_data = entry->service_data;
+ pds->instance = entry->instance;
+ goto out;
+ }
+ }
+
+ /* Update ret to indicate that the service is not yet found */
+ ret = -ENXIO;
+
+ /* Always read total_domains from the response msg */
+ if (resp->domain_list_len > resp->total_domains)
+ resp->domain_list_len = resp->total_domains;
+
+ domains_read += resp->domain_list_len;
+ } while (domains_read < resp->total_domains);
+out:
+ kfree(resp);
+ return ret;
+}
+
+static void pdr_servloc_work(struct work_struct *work)
+{
+ struct pdr_handle *pdr = container_of(work, struct pdr_handle,
+ servloc_work);
+ struct pdr_service *pds, *tmp;
+ int ret;
+
+ /* Bail out early if PD Mapper is not up */
+ mutex_lock(&pdr->locator_lock);
+ if (!pdr->locator_available) {
+ mutex_unlock(&pdr->locator_lock);
+ pr_warn("PDR: SERVICE LOCATOR service not available\n");
+ return;
+ }
+ mutex_unlock(&pdr->locator_lock);
+
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds, tmp, &pdr->lookups, node) {
+ if (!pds->need_servreg_lookup)
+ continue;
+
+ pds->need_servreg_lookup = false;
+ mutex_unlock(&pdr->list_lock);
+
+ ret = pdr_locate_service(pdr, pds);
+ if (ret < 0) {
+ if (ret == -ENXIO)
+ pds->state = SERVREG_LOCATOR_UNKNOWN_SERVICE;
+ else if (ret == -EAGAIN)
+ pds->state = SERVREG_LOCATOR_DB_UPDATED;
+ else
+ pds->state = SERVREG_LOCATOR_ERR;
+
+ pr_err("PDR: service lookup for %s failed: %d\n",
+ pds->service_name, ret);
+
+ /* Remove from lookup list */
+ mutex_lock(&pdr->list_lock);
+ list_del(&pds->node);
+ mutex_unlock(&pdr->list_lock);
+
+ /* Notify Lookup failed */
+ mutex_lock(&pdr->status_lock);
+ pdr->status(pdr, pds);
+ mutex_unlock(&pdr->status_lock);
+ kfree(pds);
+ } else {
+ pdr_servreg_link_create(pdr, pds);
+ }
+
+ return;
+ }
+ mutex_unlock(&pdr->list_lock);
+}
+
+/**
+ * pdr_add_lookup() - register a tracking request for a PD
+ * @pdr: PDR client handle
+ * @service_name: service name of the tracking request
+ * @service_path: service path of the tracking request
+ *
+ * Registering a pdr lookup allows for tracking the life cycle of the PD.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int pdr_add_lookup(struct pdr_handle *pdr, const char *service_name,
+ const char *service_path)
+{
+ struct pdr_service *pds, *pds_iter, *tmp;
+ int ret;
+
+ if (!service_name || strlen(service_name) > SERVREG_NAME_LENGTH ||
+ !service_path || strlen(service_path) > SERVREG_NAME_LENGTH)
+ return -EINVAL;
+
+ pds = kzalloc(sizeof(*pds), GFP_KERNEL);
+ if (!pds)
+ return -ENOMEM;
+
+ pds->service = SERVREG_NOTIFIER_SERVICE;
+ strcpy(pds->service_name, service_name);
+ strcpy(pds->service_path, service_path);
+ pds->need_servreg_lookup = true;
+
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds_iter, tmp, &pdr->lookups, node) {
+ if (!strcmp(pds_iter->service_path, service_path)) {
+ mutex_unlock(&pdr->list_lock);
+ ret = -EALREADY;
+ goto err;
+ }
+ }
+
+ list_add(&pds->node, &pdr->lookups);
+ mutex_unlock(&pdr->list_lock);
+
+ schedule_work(&pdr->servloc_work);
+
+ return 0;
+err:
+ kfree(pds);
+
+ return ret;
+}
+EXPORT_SYMBOL(pdr_add_lookup);
+
+/**
+ * pdr_restart_pd() - restart PD
+ * @pdr: PDR client handle
+ * @service_path: service path of restart request
+ *
+ * Restarts the PD tracked by the PDR client handle for a given service path.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int pdr_restart_pd(struct pdr_handle *pdr, const char *service_path)
+{
+ struct servreg_restart_pd_req req;
+ struct servreg_restart_pd_resp resp;
+ struct pdr_service *pds = NULL, *pds_iter, *tmp;
+ struct qmi_txn txn;
+ int ret;
+
+ if (!service_path || strlen(service_path) > SERVREG_NAME_LENGTH)
+ return -EINVAL;
+
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds_iter, tmp, &pdr->lookups, node) {
+ if (!pds_iter->service_connected)
+ continue;
+
+ if (!strcmp(pds_iter->service_path, service_path)) {
+ pds = pds_iter;
+ break;
+ }
+ }
+ mutex_unlock(&pdr->list_lock);
+
+ if (!pds)
+ return -EINVAL;
+
+ /* Prepare req message */
+ strcpy(req.service_path, pds->service_path);
+
+ ret = qmi_txn_init(&pdr->servreg_client, &txn,
+ servreg_restart_pd_resp_ei,
+ &resp);
+ if (ret < 0)
+ return ret;
+
+ ret = qmi_send_request(&pdr->servreg_client, &pdr->servreg_addr,
+ &txn, SERVREG_RESTART_PD_REQ,
+ SERVREG_RESTART_PD_REQ_MAX_LEN,
+ servreg_restart_pd_req_ei, &req);
+ if (ret < 0) {
+ qmi_txn_cancel(&txn);
+ return ret;
+ }
+
+ ret = qmi_txn_wait(&txn, 5 * HZ);
+ if (ret < 0) {
+ pr_err("PDR: %s PD restart txn wait failed: %d\n",
+ pds->service_path, ret);
+ return ret;
+ }
+
+ /* Check response if PDR is disabled */
+ if (resp.resp.result == QMI_RESULT_FAILURE_V01 &&
+ resp.resp.error == QMI_ERR_DISABLED_V01) {
+ pr_err("PDR: %s PD restart is disabled: 0x%x\n",
+ pds->service_path, resp.resp.error);
+ return -EOPNOTSUPP;
+ }
+
+ /* Check the response for other error case*/
+ if (resp.resp.result != QMI_RESULT_SUCCESS_V01) {
+ pr_err("PDR: %s request for PD restart failed: 0x%x\n",
+ pds->service_path, resp.resp.error);
+ return -EREMOTEIO;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(pdr_restart_pd);
+
+/**
+ * pdr_handle_init() - initialize the PDR client handle
+ * @pdr: PDR client handle
+ * @status: function to be called on PD state change
+ *
+ * Initializes the PDR client handle to allow for tracking/restart of PDs.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int pdr_handle_init(struct pdr_handle *pdr,
+ void (*status)(struct pdr_handle *pdr,
+ struct pdr_service *pds))
+{
+ int ret;
+
+ if (!status)
+ return -EINVAL;
+
+ pdr->status = *status;
+
+ mutex_init(&pdr->locator_lock);
+ mutex_init(&pdr->list_lock);
+ mutex_init(&pdr->status_lock);
+
+ INIT_LIST_HEAD(&pdr->lookups);
+ INIT_LIST_HEAD(&pdr->indack_list);
+
+ INIT_WORK(&pdr->servloc_work, pdr_servloc_work);
+ INIT_WORK(&pdr->servreg_work, pdr_servreg_work);
+ INIT_WORK(&pdr->indack_work, pdr_indack_work);
+
+ pdr->servreg_wq = create_singlethread_workqueue("pdr_servreg_wq");
+ if (!pdr->servreg_wq)
+ return -ENOMEM;
+
+ pdr->indack_wq = alloc_ordered_workqueue("pdr_indack_wq", WQ_HIGHPRI);
+ if (!pdr->indack_wq) {
+ ret = -ENOMEM;
+ goto destroy_servreg;
+ }
+
+ ret = qmi_handle_init(&pdr->servloc_client,
+ SERVREG_GET_DOMAIN_LIST_RESP_MAX_LEN,
+ &service_locator_ops, NULL);
+ if (ret < 0)
+ goto destroy_indack;
+
+ ret = qmi_handle_init(&pdr->servreg_client,
+ SERVREG_STATE_UPDATED_IND_MAX_LEN,
+ &service_notifier_ops, qmi_indication_handler);
+ if (ret < 0)
+ goto release_handle;
+
+ qmi_add_lookup(&pdr->servloc_client, SERVREG_LOCATOR_SERVICE, 1, 1);
+
+ return 0;
+
+release_handle:
+ qmi_handle_release(&pdr->servloc_client);
+destroy_indack:
+ destroy_workqueue(pdr->indack_wq);
+destroy_servreg:
+ destroy_workqueue(pdr->servreg_wq);
+
+ return ret;
+}
+EXPORT_SYMBOL(pdr_handle_init);
+
+/**
+ * pdr_handle_release() - release the PDR client handle
+ * @pdr: PDR client handle
+ *
+ * Cleans up pending tracking requests and releases the underlying qmi handles.
+ */
+void pdr_handle_release(struct pdr_handle *pdr)
+{
+ struct pdr_service *pds, *tmp;
+
+ mutex_lock(&pdr->list_lock);
+ list_for_each_entry_safe(pds, tmp, &pdr->lookups, node) {
+ list_del(&pds->node);
+ kfree(pds);
+ }
+ mutex_unlock(&pdr->list_lock);
+
+ cancel_work_sync(&pdr->servloc_work);
+ cancel_work_sync(&pdr->servreg_work);
+ cancel_work_sync(&pdr->indack_work);
+
+ destroy_workqueue(pdr->servreg_wq);
+ destroy_workqueue(pdr->indack_wq);
+
+ qmi_handle_release(&pdr->servloc_client);
+ qmi_handle_release(&pdr->servreg_client);
+}
+EXPORT_SYMBOL(pdr_handle_release);
diff --git a/drivers/soc/qcom/pdr_internal.h b/drivers/soc/qcom/pdr_internal.h
new file mode 100644
index 0000000000000..adaf85d509507
--- /dev/null
+++ b/drivers/soc/qcom/pdr_internal.h
@@ -0,0 +1,375 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/soc/qcom/pdr.h>
+
+#define SERVREG_LOCATOR_SERVICE 0x40
+#define SERVREG_NOTIFIER_SERVICE 0x42
+
+#define SERVREG_REGISTER_LISTENER_REQ 0x20
+#define SERVREG_GET_DOMAIN_LIST_REQ 0x21
+#define SERVREG_STATE_UPDATED_IND_ID 0x22
+#define SERVREG_SET_ACK_REQ 0x23
+#define SERVREG_RESTART_PD_REQ 0x24
+
+#define SERVREG_DOMAIN_LIST_LENGTH 32
+#define SERVREG_RESTART_PD_REQ_MAX_LEN 67
+#define SERVREG_REGISTER_LISTENER_REQ_LEN 71
+#define SERVREG_SET_ACK_REQ_LEN 72
+#define SERVREG_GET_DOMAIN_LIST_REQ_MAX_LEN 74
+#define SERVREG_STATE_UPDATED_IND_MAX_LEN 79
+#define SERVREG_GET_DOMAIN_LIST_RESP_MAX_LEN 2389
+
+struct servreg_location_entry {
+ char name[SERVREG_NAME_LENGTH + 1];
+ u8 service_data_valid;
+ u32 service_data;
+ u32 instance;
+};
+
+struct qmi_elem_info servreg_location_entry_ei[] = {
+ {
+ .data_type = QMI_STRING,
+ .elem_len = SERVREG_NAME_LENGTH + 1,
+ .elem_size = sizeof(char),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0,
+ .offset = offsetof(struct servreg_location_entry,
+ name),
+ },
+ {
+ .data_type = QMI_UNSIGNED_4_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u32),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0,
+ .offset = offsetof(struct servreg_location_entry,
+ instance),
+ },
+ {
+ .data_type = QMI_UNSIGNED_1_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0,
+ .offset = offsetof(struct servreg_location_entry,
+ service_data_valid),
+ },
+ {
+ .data_type = QMI_UNSIGNED_4_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u32),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0,
+ .offset = offsetof(struct servreg_location_entry,
+ service_data),
+ },
+ {}
+};
+
+struct servreg_get_domain_list_req {
+ char service_name[SERVREG_NAME_LENGTH + 1];
+ u8 domain_offset_valid;
+ u32 domain_offset;
+};
+
+struct qmi_elem_info servreg_get_domain_list_req_ei[] = {
+ {
+ .data_type = QMI_STRING,
+ .elem_len = SERVREG_NAME_LENGTH + 1,
+ .elem_size = sizeof(char),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x01,
+ .offset = offsetof(struct servreg_get_domain_list_req,
+ service_name),
+ },
+ {
+ .data_type = QMI_OPT_FLAG,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x10,
+ .offset = offsetof(struct servreg_get_domain_list_req,
+ domain_offset_valid),
+ },
+ {
+ .data_type = QMI_UNSIGNED_4_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u32),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x10,
+ .offset = offsetof(struct servreg_get_domain_list_req,
+ domain_offset),
+ },
+ {}
+};
+
+struct servreg_get_domain_list_resp {
+ struct qmi_response_type_v01 resp;
+ u8 total_domains_valid;
+ u16 total_domains;
+ u8 db_rev_count_valid;
+ u16 db_rev_count;
+ u8 domain_list_valid;
+ u32 domain_list_len;
+ struct servreg_location_entry domain_list[SERVREG_DOMAIN_LIST_LENGTH];
+};
+
+struct qmi_elem_info servreg_get_domain_list_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 servreg_get_domain_list_resp,
+ resp),
+ .ei_array = qmi_response_type_v01_ei,
+ },
+ {
+ .data_type = QMI_OPT_FLAG,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x10,
+ .offset = offsetof(struct servreg_get_domain_list_resp,
+ total_domains_valid),
+ },
+ {
+ .data_type = QMI_UNSIGNED_2_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u16),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x10,
+ .offset = offsetof(struct servreg_get_domain_list_resp,
+ total_domains),
+ },
+ {
+ .data_type = QMI_OPT_FLAG,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x11,
+ .offset = offsetof(struct servreg_get_domain_list_resp,
+ db_rev_count_valid),
+ },
+ {
+ .data_type = QMI_UNSIGNED_2_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u16),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x11,
+ .offset = offsetof(struct servreg_get_domain_list_resp,
+ db_rev_count),
+ },
+ {
+ .data_type = QMI_OPT_FLAG,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x12,
+ .offset = offsetof(struct servreg_get_domain_list_resp,
+ domain_list_valid),
+ },
+ {
+ .data_type = QMI_DATA_LEN,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x12,
+ .offset = offsetof(struct servreg_get_domain_list_resp,
+ domain_list_len),
+ },
+ {
+ .data_type = QMI_STRUCT,
+ .elem_len = SERVREG_DOMAIN_LIST_LENGTH,
+ .elem_size = sizeof(struct servreg_location_entry),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x12,
+ .offset = offsetof(struct servreg_get_domain_list_resp,
+ domain_list),
+ .ei_array = servreg_location_entry_ei,
+ },
+ {}
+};
+
+struct servreg_register_listener_req {
+ u8 enable;
+ char service_path[SERVREG_NAME_LENGTH + 1];
+};
+
+struct qmi_elem_info servreg_register_listener_req_ei[] = {
+ {
+ .data_type = QMI_UNSIGNED_1_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x01,
+ .offset = offsetof(struct servreg_register_listener_req,
+ enable),
+ },
+ {
+ .data_type = QMI_STRING,
+ .elem_len = SERVREG_NAME_LENGTH + 1,
+ .elem_size = sizeof(char),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x02,
+ .offset = offsetof(struct servreg_register_listener_req,
+ service_path),
+ },
+ {}
+};
+
+struct servreg_register_listener_resp {
+ struct qmi_response_type_v01 resp;
+ u8 curr_state_valid;
+ enum servreg_service_state curr_state;
+};
+
+struct qmi_elem_info servreg_register_listener_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 servreg_register_listener_resp,
+ resp),
+ .ei_array = qmi_response_type_v01_ei,
+ },
+ {
+ .data_type = QMI_OPT_FLAG,
+ .elem_len = 1,
+ .elem_size = sizeof(u8),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x10,
+ .offset = offsetof(struct servreg_register_listener_resp,
+ curr_state_valid),
+ },
+ {
+ .data_type = QMI_SIGNED_4_BYTE_ENUM,
+ .elem_len = 1,
+ .elem_size = sizeof(enum servreg_service_state),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x10,
+ .offset = offsetof(struct servreg_register_listener_resp,
+ curr_state),
+ },
+ {}
+};
+
+struct servreg_restart_pd_req {
+ char service_path[SERVREG_NAME_LENGTH + 1];
+};
+
+struct qmi_elem_info servreg_restart_pd_req_ei[] = {
+ {
+ .data_type = QMI_STRING,
+ .elem_len = SERVREG_NAME_LENGTH + 1,
+ .elem_size = sizeof(char),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x01,
+ .offset = offsetof(struct servreg_restart_pd_req,
+ service_path),
+ },
+ {}
+};
+
+struct servreg_restart_pd_resp {
+ struct qmi_response_type_v01 resp;
+};
+
+struct qmi_elem_info servreg_restart_pd_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 servreg_restart_pd_resp,
+ resp),
+ .ei_array = qmi_response_type_v01_ei,
+ },
+ {}
+};
+
+struct servreg_state_updated_ind {
+ enum servreg_service_state curr_state;
+ char service_path[SERVREG_NAME_LENGTH + 1];
+ u16 transaction_id;
+};
+
+struct qmi_elem_info servreg_state_updated_ind_ei[] = {
+ {
+ .data_type = QMI_SIGNED_4_BYTE_ENUM,
+ .elem_len = 1,
+ .elem_size = sizeof(u32),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x01,
+ .offset = offsetof(struct servreg_state_updated_ind,
+ curr_state),
+ },
+ {
+ .data_type = QMI_STRING,
+ .elem_len = SERVREG_NAME_LENGTH + 1,
+ .elem_size = sizeof(char),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x02,
+ .offset = offsetof(struct servreg_state_updated_ind,
+ service_path),
+ },
+ {
+ .data_type = QMI_UNSIGNED_2_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u16),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x03,
+ .offset = offsetof(struct servreg_state_updated_ind,
+ transaction_id),
+ },
+ {}
+};
+
+struct servreg_set_ack_req {
+ char service_path[SERVREG_NAME_LENGTH + 1];
+ u16 transaction_id;
+};
+
+struct qmi_elem_info servreg_set_ack_req_ei[] = {
+ {
+ .data_type = QMI_STRING,
+ .elem_len = SERVREG_NAME_LENGTH + 1,
+ .elem_size = sizeof(char),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x01,
+ .offset = offsetof(struct servreg_set_ack_req,
+ service_path),
+ },
+ {
+ .data_type = QMI_UNSIGNED_2_BYTE,
+ .elem_len = 1,
+ .elem_size = sizeof(u16),
+ .array_type = NO_ARRAY,
+ .tlv_type = 0x02,
+ .offset = offsetof(struct servreg_set_ack_req,
+ transaction_id),
+ },
+ {}
+};
+
+struct servreg_set_ack_resp {
+ struct qmi_response_type_v01 resp;
+};
+
+struct qmi_elem_info servreg_set_ack_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 servreg_set_ack_resp,
+ resp),
+ .ei_array = qmi_response_type_v01_ei,
+ },
+ {}
+};
diff --git a/include/linux/soc/qcom/pdr.h b/include/linux/soc/qcom/pdr.h
new file mode 100644
index 0000000000000..7d48531705ac3
--- /dev/null
+++ b/include/linux/soc/qcom/pdr.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __QCOM_PDR_HELPER__
+#define __QCOM_PDR_HELPER__
+
+#include <linux/soc/qcom/qmi.h>
+
+#define SERVREG_NAME_LENGTH 64
+
+enum servreg_service_state {
+ SERVREG_LOCATOR_ERR = 0x1,
+ SERVREG_LOCATOR_UNKNOWN_SERVICE = 0x2,
+ SERVREG_LOCATOR_DB_UPDATED = 0x3,
+ SERVREG_SERVICE_STATE_DOWN = 0x0FFFFFFF,
+ SERVREG_SERVICE_STATE_UP = 0x1FFFFFFF,
+ SERVREG_SERVICE_STATE_EARLY_DOWN = 0x2FFFFFFF,
+ SERVREG_SERVICE_STATE_UNINIT = 0x7FFFFFFF,
+};
+
+/**
+ * struct pdr_service - context to track lookups/restarts
+ * @service_name: name of the service running on the PD
+ * @service_path: service path of the PD
+ * @service_data_valid: indicates if service_data field has valid data
+ * @service_data: service data provided by servreg_locator service
+ * @need_servreg_lookup: state flag for tracking servreg lookup requests
+ * @need_servreg_register: state flag for tracking pending servreg register
+ * @need_servreg_remove: state flag for tracking pending servreg remove
+ * @service_connected: current state of servreg_notifier qmi service
+ * @state: current state of PD
+ * @service: servreg_notifer service type
+ * @instance: instance id of the @service
+ * @priv: handle for client's use
+ * @node: list_head for house keeping
+ */
+struct pdr_service {
+ char service_name[SERVREG_NAME_LENGTH + 1];
+ char service_path[SERVREG_NAME_LENGTH + 1];
+
+ u8 service_data_valid;
+ u32 service_data;
+
+ bool need_servreg_lookup;
+ bool need_servreg_register;
+ bool need_servreg_remove;
+ bool service_connected;
+ int state;
+
+ unsigned int instance;
+ unsigned int service;
+
+ void *priv;
+ struct list_head node;
+};
+
+/**
+ * struct pdr_handle - PDR context
+ * @servloc_client: servreg_locator qmi handle
+ * @servreg_client: servreg_notifier qmi handle
+ * @servloc_addr: socket addr of @servloc_client
+ * @servreg_addr: socket addr of @servreg_client
+ * @lookups: list of lookup requests
+ * @indack_list: list of qmi indications from servreg_notifier services
+ * @list_lock: lock for modifications of lists
+ * @status_lock: lock to serialize pd status call back
+ * @locator_lock: lock for the shared locator state flag
+ * @locator_available: state flag to track servreg_locator service
+ * @servloc_work: work for handling lookup requests
+ * @servreg_work: work for registering with servreg_notifier service
+ * @indack_work: work for acking the qmi indications
+ * @servreg_wq: work queue to post @servreg_work and @servdel_work on
+ * @indack_wq: work queue to post @indack_work on
+ * @status: callback to inform the client on PD service state change
+ */
+struct pdr_handle {
+ struct qmi_handle servloc_client;
+ struct qmi_handle servreg_client;
+
+ struct sockaddr_qrtr servloc_addr;
+ struct sockaddr_qrtr servreg_addr;
+
+ struct list_head lookups;
+ struct list_head indack_list;
+
+ /* control access to pdr lookup list */
+ struct mutex list_lock;
+
+ /* serialize pd status invocation */
+ struct mutex status_lock;
+
+ /* control access to service locator state */
+ struct mutex locator_lock;
+ bool locator_available;
+
+ struct work_struct servloc_work;
+ struct work_struct servreg_work;
+ struct work_struct indack_work;
+
+ struct workqueue_struct *servreg_wq;
+ struct workqueue_struct *indack_wq;
+
+ void (*status)(struct pdr_handle *pdr, struct pdr_service *pds);
+};
+
+int pdr_handle_init(struct pdr_handle *pdr, void (*status)(struct pdr_handle *pdr, struct pdr_service *pds));
+int pdr_add_lookup(struct pdr_handle *pdr, const char *service_name, const char *service_path);
+int pdr_restart_pd(struct pdr_handle *pdr, const char *service_path);
+void pdr_handle_release(struct pdr_handle *pdr);
+
+#endif
diff --git a/include/linux/soc/qcom/qmi.h b/include/linux/soc/qcom/qmi.h
index 5efa2b67fa557..e712f94b89fcc 100644
--- a/include/linux/soc/qcom/qmi.h
+++ b/include/linux/soc/qcom/qmi.h
@@ -88,6 +88,7 @@ struct qmi_elem_info {
#define QMI_ERR_CLIENT_IDS_EXHAUSTED_V01 5
#define QMI_ERR_INVALID_ID_V01 41
#define QMI_ERR_ENCODING_V01 58
+#define QMI_ERR_DISABLED_V01 69
#define QMI_ERR_INCOMPATIBLE_STATE_V01 90
#define QMI_ERR_NOT_SUPPORTED_V01 94
--
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a Linux Foundation Collaborative Project
