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![Alex Elder](/assets/img/avatar_default.png)
Introduce a new function that abstracts finding information about a region in IPA-local memory, given its memory region ID. For now it simply uses the region ID as an index into the IPA memory array. If the region is not defined, ipa_mem_find() returns a null pointer. Update all code that accesses the ipa->mem[] array directly to use ipa_mem_find() instead. The return value must be checked for null when optional memory regions are sought. Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
538 lines
18 KiB
C
538 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved.
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* Copyright (C) 2018-2020 Linaro Ltd.
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/qrtr.h>
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#include <linux/soc/qcom/qmi.h>
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#include "ipa.h"
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#include "ipa_endpoint.h"
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#include "ipa_mem.h"
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#include "ipa_table.h"
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#include "ipa_modem.h"
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#include "ipa_qmi_msg.h"
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/**
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* DOC: AP/Modem QMI Handshake
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*
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* The AP and modem perform a "handshake" at initialization time to ensure
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* both sides know when everything is ready to begin operating. The AP
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* driver (this code) uses two QMI handles (endpoints) for this; a client
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* using a service on the modem, and server to service modem requests (and
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* to supply an indication message from the AP). Once the handshake is
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* complete, the AP and modem may begin IPA operation. This occurs
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* only when the AP IPA driver, modem IPA driver, and IPA microcontroller
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* are ready.
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*
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* The QMI service on the modem expects to receive an INIT_DRIVER request from
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* the AP, which contains parameters used by the modem during initialization.
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* The AP sends this request as soon as it is knows the modem side service
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* is available. The modem responds to this request, and if this response
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* contains a success result, the AP knows the modem IPA driver is ready.
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*
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* The modem is responsible for loading firmware on the IPA microcontroller.
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* This occurs only during the initial modem boot. The modem sends a
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* separate DRIVER_INIT_COMPLETE request to the AP to report that the
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* microcontroller is ready. The AP may assume the microcontroller is
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* ready and remain so (even if the modem reboots) once it has received
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* and responded to this request.
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*
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* There is one final exchange involved in the handshake. It is required
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* on the initial modem boot, but optional (but in practice does occur) on
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* subsequent boots. The modem expects to receive a final INIT_COMPLETE
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* indication message from the AP when it is about to begin its normal
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* operation. The AP will only send this message after it has received
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* and responded to an INDICATION_REGISTER request from the modem.
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*
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* So in summary:
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* - Whenever the AP learns the modem has booted and its IPA QMI service
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* is available, it sends an INIT_DRIVER request to the modem. The
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* modem supplies a success response when it is ready to operate.
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* - On the initial boot, the modem sets up the IPA microcontroller, and
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* sends a DRIVER_INIT_COMPLETE request to the AP when this is done.
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* - When the modem is ready to receive an INIT_COMPLETE indication from
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* the AP, it sends an INDICATION_REGISTER request to the AP.
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* - On the initial modem boot, everything is ready when:
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* - AP has received a success response from its INIT_DRIVER request
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* - AP has responded to a DRIVER_INIT_COMPLETE request
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* - AP has responded to an INDICATION_REGISTER request from the modem
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* - AP has sent an INIT_COMPLETE indication to the modem
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* - On subsequent modem boots, everything is ready when:
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* - AP has received a success response from its INIT_DRIVER request
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* - AP has responded to a DRIVER_INIT_COMPLETE request
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* - The INDICATION_REGISTER request and INIT_COMPLETE indication are
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* optional for non-initial modem boots, and have no bearing on the
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* determination of when things are "ready"
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*/
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#define IPA_HOST_SERVICE_SVC_ID 0x31
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#define IPA_HOST_SVC_VERS 1
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#define IPA_HOST_SERVICE_INS_ID 1
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#define IPA_MODEM_SERVICE_SVC_ID 0x31
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#define IPA_MODEM_SERVICE_INS_ID 2
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#define IPA_MODEM_SVC_VERS 1
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#define QMI_INIT_DRIVER_TIMEOUT 60000 /* A minute in milliseconds */
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/* Send an INIT_COMPLETE indication message to the modem */
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static void ipa_server_init_complete(struct ipa_qmi *ipa_qmi)
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{
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struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
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struct qmi_handle *qmi = &ipa_qmi->server_handle;
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struct sockaddr_qrtr *sq = &ipa_qmi->modem_sq;
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struct ipa_init_complete_ind ind = { };
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int ret;
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ind.status.result = QMI_RESULT_SUCCESS_V01;
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ind.status.error = QMI_ERR_NONE_V01;
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ret = qmi_send_indication(qmi, sq, IPA_QMI_INIT_COMPLETE,
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IPA_QMI_INIT_COMPLETE_IND_SZ,
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ipa_init_complete_ind_ei, &ind);
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if (ret)
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dev_err(&ipa->pdev->dev,
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"error %d sending init complete indication\n", ret);
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else
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ipa_qmi->indication_sent = true;
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}
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/* If requested (and not already sent) send the INIT_COMPLETE indication */
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static void ipa_qmi_indication(struct ipa_qmi *ipa_qmi)
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{
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if (!ipa_qmi->indication_requested)
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return;
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if (ipa_qmi->indication_sent)
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return;
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ipa_server_init_complete(ipa_qmi);
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}
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/* Determine whether everything is ready to start normal operation.
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* We know everything (else) is ready when we know the IPA driver on
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* the modem is ready, and the microcontroller is ready.
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*
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* When the modem boots (or reboots), the handshake sequence starts
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* with the AP sending the modem an INIT_DRIVER request. Within
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* that request, the uc_loaded flag will be zero (false) for an
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* initial boot, non-zero (true) for a subsequent (SSR) boot.
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*/
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static void ipa_qmi_ready(struct ipa_qmi *ipa_qmi)
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{
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struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
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int ret;
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/* We aren't ready until the modem and microcontroller are */
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if (!ipa_qmi->modem_ready || !ipa_qmi->uc_ready)
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return;
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/* Send the indication message if it was requested */
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ipa_qmi_indication(ipa_qmi);
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/* The initial boot requires us to send the indication. */
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if (ipa_qmi->initial_boot) {
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if (!ipa_qmi->indication_sent)
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return;
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/* The initial modem boot completed successfully */
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ipa_qmi->initial_boot = false;
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}
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/* We're ready. Start up normal operation */
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ipa = container_of(ipa_qmi, struct ipa, qmi);
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ret = ipa_modem_start(ipa);
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if (ret)
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dev_err(&ipa->pdev->dev, "error %d starting modem\n", ret);
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}
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/* All QMI clients from the modem node are gone (modem shut down or crashed). */
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static void ipa_server_bye(struct qmi_handle *qmi, unsigned int node)
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{
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struct ipa_qmi *ipa_qmi;
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ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle);
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/* The modem client and server go away at the same time */
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memset(&ipa_qmi->modem_sq, 0, sizeof(ipa_qmi->modem_sq));
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/* initial_boot doesn't change when modem reboots */
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/* uc_ready doesn't change when modem reboots */
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ipa_qmi->modem_ready = false;
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ipa_qmi->indication_requested = false;
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ipa_qmi->indication_sent = false;
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}
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static const struct qmi_ops ipa_server_ops = {
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.bye = ipa_server_bye,
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};
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/* Callback function to handle an INDICATION_REGISTER request message from the
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* modem. This informs the AP that the modem is now ready to receive the
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* INIT_COMPLETE indication message.
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*/
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static void ipa_server_indication_register(struct qmi_handle *qmi,
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struct sockaddr_qrtr *sq,
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struct qmi_txn *txn,
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const void *decoded)
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{
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struct ipa_indication_register_rsp rsp = { };
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struct ipa_qmi *ipa_qmi;
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struct ipa *ipa;
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int ret;
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ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle);
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ipa = container_of(ipa_qmi, struct ipa, qmi);
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rsp.rsp.result = QMI_RESULT_SUCCESS_V01;
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rsp.rsp.error = QMI_ERR_NONE_V01;
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ret = qmi_send_response(qmi, sq, txn, IPA_QMI_INDICATION_REGISTER,
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IPA_QMI_INDICATION_REGISTER_RSP_SZ,
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ipa_indication_register_rsp_ei, &rsp);
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if (!ret) {
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ipa_qmi->indication_requested = true;
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ipa_qmi_ready(ipa_qmi); /* We might be ready now */
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} else {
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dev_err(&ipa->pdev->dev,
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"error %d sending register indication response\n", ret);
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}
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}
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/* Respond to a DRIVER_INIT_COMPLETE request message from the modem. */
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static void ipa_server_driver_init_complete(struct qmi_handle *qmi,
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struct sockaddr_qrtr *sq,
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struct qmi_txn *txn,
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const void *decoded)
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{
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struct ipa_driver_init_complete_rsp rsp = { };
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struct ipa_qmi *ipa_qmi;
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struct ipa *ipa;
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int ret;
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ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle);
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ipa = container_of(ipa_qmi, struct ipa, qmi);
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rsp.rsp.result = QMI_RESULT_SUCCESS_V01;
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rsp.rsp.error = QMI_ERR_NONE_V01;
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ret = qmi_send_response(qmi, sq, txn, IPA_QMI_DRIVER_INIT_COMPLETE,
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IPA_QMI_DRIVER_INIT_COMPLETE_RSP_SZ,
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ipa_driver_init_complete_rsp_ei, &rsp);
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if (!ret) {
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ipa_qmi->uc_ready = true;
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ipa_qmi_ready(ipa_qmi); /* We might be ready now */
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} else {
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dev_err(&ipa->pdev->dev,
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"error %d sending init complete response\n", ret);
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}
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}
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/* The server handles two request message types sent by the modem. */
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static const struct qmi_msg_handler ipa_server_msg_handlers[] = {
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{
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.type = QMI_REQUEST,
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.msg_id = IPA_QMI_INDICATION_REGISTER,
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.ei = ipa_indication_register_req_ei,
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.decoded_size = IPA_QMI_INDICATION_REGISTER_REQ_SZ,
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.fn = ipa_server_indication_register,
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},
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{
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.type = QMI_REQUEST,
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.msg_id = IPA_QMI_DRIVER_INIT_COMPLETE,
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.ei = ipa_driver_init_complete_req_ei,
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.decoded_size = IPA_QMI_DRIVER_INIT_COMPLETE_REQ_SZ,
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.fn = ipa_server_driver_init_complete,
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},
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{ },
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};
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/* Handle an INIT_DRIVER response message from the modem. */
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static void ipa_client_init_driver(struct qmi_handle *qmi,
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struct sockaddr_qrtr *sq,
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struct qmi_txn *txn, const void *decoded)
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{
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txn->result = 0; /* IPA_QMI_INIT_DRIVER request was successful */
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complete(&txn->completion);
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}
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/* The client handles one response message type sent by the modem. */
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static const struct qmi_msg_handler ipa_client_msg_handlers[] = {
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{
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.type = QMI_RESPONSE,
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.msg_id = IPA_QMI_INIT_DRIVER,
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.ei = ipa_init_modem_driver_rsp_ei,
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.decoded_size = IPA_QMI_INIT_DRIVER_RSP_SZ,
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.fn = ipa_client_init_driver,
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},
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{ },
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};
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/* Return a pointer to an init modem driver request structure, which contains
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* configuration parameters for the modem. The modem may be started multiple
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* times, but generally these parameters don't change so we can reuse the
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* request structure once it's initialized. The only exception is the
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* skip_uc_load field, which will be set only after the microcontroller has
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* reported it has completed its initialization.
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*/
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static const struct ipa_init_modem_driver_req *
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init_modem_driver_req(struct ipa_qmi *ipa_qmi)
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{
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struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi);
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static struct ipa_init_modem_driver_req req;
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const struct ipa_mem *mem;
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/* The microcontroller is initialized on the first boot */
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req.skip_uc_load_valid = 1;
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req.skip_uc_load = ipa->uc_loaded ? 1 : 0;
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/* We only have to initialize most of it once */
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if (req.platform_type_valid)
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return &req;
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req.platform_type_valid = 1;
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req.platform_type = IPA_QMI_PLATFORM_TYPE_MSM_ANDROID;
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mem = ipa_mem_find(ipa, IPA_MEM_MODEM_HEADER);
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if (mem->size) {
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req.hdr_tbl_info_valid = 1;
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req.hdr_tbl_info.start = ipa->mem_offset + mem->offset;
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req.hdr_tbl_info.end = req.hdr_tbl_info.start + mem->size - 1;
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}
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mem = ipa_mem_find(ipa, IPA_MEM_V4_ROUTE);
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req.v4_route_tbl_info_valid = 1;
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req.v4_route_tbl_info.start = ipa->mem_offset + mem->offset;
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req.v4_route_tbl_info.count = mem->size / sizeof(__le64);
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mem = ipa_mem_find(ipa, IPA_MEM_V6_ROUTE);
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req.v6_route_tbl_info_valid = 1;
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req.v6_route_tbl_info.start = ipa->mem_offset + mem->offset;
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req.v6_route_tbl_info.count = mem->size / sizeof(__le64);
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mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER);
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req.v4_filter_tbl_start_valid = 1;
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req.v4_filter_tbl_start = ipa->mem_offset + mem->offset;
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mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER);
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req.v6_filter_tbl_start_valid = 1;
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req.v6_filter_tbl_start = ipa->mem_offset + mem->offset;
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mem = ipa_mem_find(ipa, IPA_MEM_MODEM);
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if (mem->size) {
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req.modem_mem_info_valid = 1;
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req.modem_mem_info.start = ipa->mem_offset + mem->offset;
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req.modem_mem_info.size = mem->size;
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}
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req.ctrl_comm_dest_end_pt_valid = 1;
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req.ctrl_comm_dest_end_pt =
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ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->endpoint_id;
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/* skip_uc_load_valid and skip_uc_load are set above */
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mem = ipa_mem_find(ipa, IPA_MEM_MODEM_PROC_CTX);
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if (mem->size) {
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req.hdr_proc_ctx_tbl_info_valid = 1;
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req.hdr_proc_ctx_tbl_info.start =
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ipa->mem_offset + mem->offset;
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req.hdr_proc_ctx_tbl_info.end =
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req.hdr_proc_ctx_tbl_info.start + mem->size - 1;
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}
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/* Nothing to report for the compression table (zip_tbl_info) */
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mem = ipa_mem_find(ipa, IPA_MEM_V4_ROUTE_HASHED);
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if (mem->size) {
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req.v4_hash_route_tbl_info_valid = 1;
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req.v4_hash_route_tbl_info.start =
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ipa->mem_offset + mem->offset;
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req.v4_hash_route_tbl_info.count = mem->size / sizeof(__le64);
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}
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mem = ipa_mem_find(ipa, IPA_MEM_V6_ROUTE_HASHED);
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if (mem->size) {
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req.v6_hash_route_tbl_info_valid = 1;
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req.v6_hash_route_tbl_info.start =
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ipa->mem_offset + mem->offset;
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req.v6_hash_route_tbl_info.count = mem->size / sizeof(__le64);
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}
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mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER_HASHED);
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if (mem->size) {
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req.v4_hash_filter_tbl_start_valid = 1;
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req.v4_hash_filter_tbl_start = ipa->mem_offset + mem->offset;
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}
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mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER_HASHED);
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if (mem->size) {
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req.v6_hash_filter_tbl_start_valid = 1;
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req.v6_hash_filter_tbl_start = ipa->mem_offset + mem->offset;
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}
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/* The stats fields are only valid for IPA v4.0+ */
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if (ipa->version >= IPA_VERSION_4_0) {
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mem = ipa_mem_find(ipa, IPA_MEM_STATS_QUOTA_MODEM);
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if (mem->size) {
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req.hw_stats_quota_base_addr_valid = 1;
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req.hw_stats_quota_base_addr =
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ipa->mem_offset + mem->offset;
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req.hw_stats_quota_size_valid = 1;
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req.hw_stats_quota_size = ipa->mem_offset + mem->size;
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}
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/* If the DROP stats region is defined, include it */
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mem = ipa_mem_find(ipa, IPA_MEM_STATS_DROP);
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if (mem && mem->size) {
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req.hw_stats_drop_base_addr_valid = 1;
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req.hw_stats_drop_base_addr =
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ipa->mem_offset + mem->offset;
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req.hw_stats_drop_size_valid = 1;
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req.hw_stats_drop_size = ipa->mem_offset + mem->size;
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}
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}
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return &req;
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}
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/* Send an INIT_DRIVER request to the modem, and wait for it to complete. */
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static void ipa_client_init_driver_work(struct work_struct *work)
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{
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unsigned long timeout = msecs_to_jiffies(QMI_INIT_DRIVER_TIMEOUT);
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const struct ipa_init_modem_driver_req *req;
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struct ipa_qmi *ipa_qmi;
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struct qmi_handle *qmi;
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struct qmi_txn txn;
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struct device *dev;
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struct ipa *ipa;
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int ret;
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ipa_qmi = container_of(work, struct ipa_qmi, init_driver_work);
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qmi = &ipa_qmi->client_handle;
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ipa = container_of(ipa_qmi, struct ipa, qmi);
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dev = &ipa->pdev->dev;
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ret = qmi_txn_init(qmi, &txn, NULL, NULL);
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if (ret < 0) {
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dev_err(dev, "error %d preparing init driver request\n", ret);
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return;
|
|
}
|
|
|
|
/* Send the request, and if successful wait for its response */
|
|
req = init_modem_driver_req(ipa_qmi);
|
|
ret = qmi_send_request(qmi, &ipa_qmi->modem_sq, &txn,
|
|
IPA_QMI_INIT_DRIVER, IPA_QMI_INIT_DRIVER_REQ_SZ,
|
|
ipa_init_modem_driver_req_ei, req);
|
|
if (ret)
|
|
dev_err(dev, "error %d sending init driver request\n", ret);
|
|
else if ((ret = qmi_txn_wait(&txn, timeout)))
|
|
dev_err(dev, "error %d awaiting init driver response\n", ret);
|
|
|
|
if (!ret) {
|
|
ipa_qmi->modem_ready = true;
|
|
ipa_qmi_ready(ipa_qmi); /* We might be ready now */
|
|
} else {
|
|
/* If any error occurs we need to cancel the transaction */
|
|
qmi_txn_cancel(&txn);
|
|
}
|
|
}
|
|
|
|
/* The modem server is now available. We will send an INIT_DRIVER request
|
|
* to the modem, but can't wait for it to complete in this callback thread.
|
|
* Schedule a worker on the global workqueue to do that for us.
|
|
*/
|
|
static int
|
|
ipa_client_new_server(struct qmi_handle *qmi, struct qmi_service *svc)
|
|
{
|
|
struct ipa_qmi *ipa_qmi;
|
|
|
|
ipa_qmi = container_of(qmi, struct ipa_qmi, client_handle);
|
|
|
|
ipa_qmi->modem_sq.sq_family = AF_QIPCRTR;
|
|
ipa_qmi->modem_sq.sq_node = svc->node;
|
|
ipa_qmi->modem_sq.sq_port = svc->port;
|
|
|
|
schedule_work(&ipa_qmi->init_driver_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct qmi_ops ipa_client_ops = {
|
|
.new_server = ipa_client_new_server,
|
|
};
|
|
|
|
/* This is called by ipa_setup(). We can be informed via remoteproc that
|
|
* the modem has shut down, in which case this function will be called
|
|
* again to prepare for it coming back up again.
|
|
*/
|
|
int ipa_qmi_setup(struct ipa *ipa)
|
|
{
|
|
struct ipa_qmi *ipa_qmi = &ipa->qmi;
|
|
int ret;
|
|
|
|
ipa_qmi->initial_boot = true;
|
|
|
|
/* The server handle is used to handle the DRIVER_INIT_COMPLETE
|
|
* request on the first modem boot. It also receives the
|
|
* INDICATION_REGISTER request on the first boot and (optionally)
|
|
* subsequent boots. The INIT_COMPLETE indication message is
|
|
* sent over the server handle if requested.
|
|
*/
|
|
ret = qmi_handle_init(&ipa_qmi->server_handle,
|
|
IPA_QMI_SERVER_MAX_RCV_SZ, &ipa_server_ops,
|
|
ipa_server_msg_handlers);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = qmi_add_server(&ipa_qmi->server_handle, IPA_HOST_SERVICE_SVC_ID,
|
|
IPA_HOST_SVC_VERS, IPA_HOST_SERVICE_INS_ID);
|
|
if (ret)
|
|
goto err_server_handle_release;
|
|
|
|
/* The client handle is only used for sending an INIT_DRIVER request
|
|
* to the modem, and receiving its response message.
|
|
*/
|
|
ret = qmi_handle_init(&ipa_qmi->client_handle,
|
|
IPA_QMI_CLIENT_MAX_RCV_SZ, &ipa_client_ops,
|
|
ipa_client_msg_handlers);
|
|
if (ret)
|
|
goto err_server_handle_release;
|
|
|
|
/* We need this ready before the service lookup is added */
|
|
INIT_WORK(&ipa_qmi->init_driver_work, ipa_client_init_driver_work);
|
|
|
|
ret = qmi_add_lookup(&ipa_qmi->client_handle, IPA_MODEM_SERVICE_SVC_ID,
|
|
IPA_MODEM_SVC_VERS, IPA_MODEM_SERVICE_INS_ID);
|
|
if (ret)
|
|
goto err_client_handle_release;
|
|
|
|
return 0;
|
|
|
|
err_client_handle_release:
|
|
/* Releasing the handle also removes registered lookups */
|
|
qmi_handle_release(&ipa_qmi->client_handle);
|
|
memset(&ipa_qmi->client_handle, 0, sizeof(ipa_qmi->client_handle));
|
|
err_server_handle_release:
|
|
/* Releasing the handle also removes registered services */
|
|
qmi_handle_release(&ipa_qmi->server_handle);
|
|
memset(&ipa_qmi->server_handle, 0, sizeof(ipa_qmi->server_handle));
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ipa_qmi_teardown(struct ipa *ipa)
|
|
{
|
|
cancel_work_sync(&ipa->qmi.init_driver_work);
|
|
|
|
qmi_handle_release(&ipa->qmi.client_handle);
|
|
memset(&ipa->qmi.client_handle, 0, sizeof(ipa->qmi.client_handle));
|
|
|
|
qmi_handle_release(&ipa->qmi.server_handle);
|
|
memset(&ipa->qmi.server_handle, 0, sizeof(ipa->qmi.server_handle));
|
|
}
|