![Bjorn Andersson](/assets/img/avatar_default.png)
Requesting a graceful shutdown through the shared memory state signals will not be acked in the event that sysmon has already successfully shut down the remote firmware. So extend the stop request API to optionally take the remoteproc's sysmon instance and query if there's already been a successful shutdown attempt, before doing the signal dance. Tested-by: Steev Klimaszewski <steev@kali.org> Reviewed-by: Rishabh Bhatnagar <rishabhb@codeaurora.org> Link: https://lore.kernel.org/r/20201122054135.802935-4-bjorn.andersson@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
295 lines
7.5 KiB
C
295 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Qualcomm Peripheral Image Loader for Q6V5
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*
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* Copyright (C) 2016-2018 Linaro Ltd.
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* Copyright (C) 2014 Sony Mobile Communications AB
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* Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/soc/qcom/smem.h>
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#include <linux/soc/qcom/smem_state.h>
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#include <linux/remoteproc.h>
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#include "qcom_common.h"
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#include "qcom_q6v5.h"
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#define Q6V5_PANIC_DELAY_MS 200
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/**
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* qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start
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* @q6v5: reference to qcom_q6v5 context to be reinitialized
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*
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* Return: 0 on success, negative errno on failure
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*/
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int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5)
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{
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reinit_completion(&q6v5->start_done);
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reinit_completion(&q6v5->stop_done);
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q6v5->running = true;
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q6v5->handover_issued = false;
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enable_irq(q6v5->handover_irq);
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_prepare);
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/**
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* qcom_q6v5_unprepare() - unprepare the qcom_q6v5 context after stop
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* @q6v5: reference to qcom_q6v5 context to be unprepared
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*
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* Return: 0 on success, 1 if handover hasn't yet been called
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*/
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int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5)
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{
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disable_irq(q6v5->handover_irq);
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return !q6v5->handover_issued;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_unprepare);
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static irqreturn_t q6v5_wdog_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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size_t len;
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char *msg;
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/* Sometimes the stop triggers a watchdog rather than a stop-ack */
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if (!q6v5->running) {
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complete(&q6v5->stop_done);
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return IRQ_HANDLED;
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}
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msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
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if (!IS_ERR(msg) && len > 0 && msg[0])
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dev_err(q6v5->dev, "watchdog received: %s\n", msg);
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else
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dev_err(q6v5->dev, "watchdog without message\n");
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rproc_report_crash(q6v5->rproc, RPROC_WATCHDOG);
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return IRQ_HANDLED;
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}
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static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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size_t len;
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char *msg;
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msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, q6v5->crash_reason, &len);
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if (!IS_ERR(msg) && len > 0 && msg[0])
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dev_err(q6v5->dev, "fatal error received: %s\n", msg);
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else
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dev_err(q6v5->dev, "fatal error without message\n");
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q6v5->running = false;
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rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);
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return IRQ_HANDLED;
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}
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static irqreturn_t q6v5_ready_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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complete(&q6v5->start_done);
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return IRQ_HANDLED;
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}
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/**
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* qcom_q6v5_wait_for_start() - wait for remote processor start signal
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* @q6v5: reference to qcom_q6v5 context
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* @timeout: timeout to wait for the event, in jiffies
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*
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* qcom_q6v5_unprepare() should not be called when this function fails.
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*
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* Return: 0 on success, -ETIMEDOUT on timeout
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*/
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int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout)
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{
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int ret;
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ret = wait_for_completion_timeout(&q6v5->start_done, timeout);
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if (!ret)
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disable_irq(q6v5->handover_irq);
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return !ret ? -ETIMEDOUT : 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_wait_for_start);
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static irqreturn_t q6v5_handover_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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if (q6v5->handover)
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q6v5->handover(q6v5);
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q6v5->handover_issued = true;
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return IRQ_HANDLED;
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}
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static irqreturn_t q6v5_stop_interrupt(int irq, void *data)
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{
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struct qcom_q6v5 *q6v5 = data;
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complete(&q6v5->stop_done);
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return IRQ_HANDLED;
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}
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/**
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* qcom_q6v5_request_stop() - request the remote processor to stop
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* @q6v5: reference to qcom_q6v5 context
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* @sysmon: reference to the remote's sysmon instance, or NULL
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*
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* Return: 0 on success, negative errno on failure
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*/
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int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5, struct qcom_sysmon *sysmon)
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{
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int ret;
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q6v5->running = false;
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/* Don't perform SMP2P dance if sysmon already shut down the remote */
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if (qcom_sysmon_shutdown_acked(sysmon))
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return 0;
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qcom_smem_state_update_bits(q6v5->state,
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BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
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ret = wait_for_completion_timeout(&q6v5->stop_done, 5 * HZ);
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qcom_smem_state_update_bits(q6v5->state, BIT(q6v5->stop_bit), 0);
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return ret == 0 ? -ETIMEDOUT : 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
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/**
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* qcom_q6v5_panic() - panic handler to invoke a stop on the remote
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* @q6v5: reference to qcom_q6v5 context
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*
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* Set the stop bit and sleep in order to allow the remote processor to flush
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* its caches etc for post mortem debugging.
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*
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* Return: 200ms
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*/
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unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
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{
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qcom_smem_state_update_bits(q6v5->state,
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BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
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return Q6V5_PANIC_DELAY_MS;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_panic);
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/**
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* qcom_q6v5_init() - initializer of the q6v5 common struct
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* @q6v5: handle to be initialized
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* @pdev: platform_device reference for acquiring resources
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* @rproc: associated remoteproc instance
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* @crash_reason: SMEM id for crash reason string, or 0 if none
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* @handover: function to be called when proxy resources should be released
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*
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* Return: 0 on success, negative errno on failure
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*/
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int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev,
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struct rproc *rproc, int crash_reason,
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void (*handover)(struct qcom_q6v5 *q6v5))
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{
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int ret;
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q6v5->rproc = rproc;
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q6v5->dev = &pdev->dev;
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q6v5->crash_reason = crash_reason;
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q6v5->handover = handover;
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init_completion(&q6v5->start_done);
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init_completion(&q6v5->stop_done);
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q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog");
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if (q6v5->wdog_irq < 0)
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return q6v5->wdog_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->wdog_irq,
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NULL, q6v5_wdog_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 wdog", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire wdog IRQ\n");
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return ret;
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}
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q6v5->fatal_irq = platform_get_irq_byname(pdev, "fatal");
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if (q6v5->fatal_irq < 0)
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return q6v5->fatal_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->fatal_irq,
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NULL, q6v5_fatal_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 fatal", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire fatal IRQ\n");
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return ret;
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}
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q6v5->ready_irq = platform_get_irq_byname(pdev, "ready");
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if (q6v5->ready_irq < 0)
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return q6v5->ready_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->ready_irq,
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NULL, q6v5_ready_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 ready", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire ready IRQ\n");
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return ret;
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}
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q6v5->handover_irq = platform_get_irq_byname(pdev, "handover");
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if (q6v5->handover_irq < 0)
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return q6v5->handover_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->handover_irq,
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NULL, q6v5_handover_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 handover", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire handover IRQ\n");
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return ret;
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}
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disable_irq(q6v5->handover_irq);
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q6v5->stop_irq = platform_get_irq_byname(pdev, "stop-ack");
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if (q6v5->stop_irq < 0)
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return q6v5->stop_irq;
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ret = devm_request_threaded_irq(&pdev->dev, q6v5->stop_irq,
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NULL, q6v5_stop_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"q6v5 stop", q6v5);
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if (ret) {
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dev_err(&pdev->dev, "failed to acquire stop-ack IRQ\n");
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return ret;
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}
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q6v5->state = qcom_smem_state_get(&pdev->dev, "stop", &q6v5->stop_bit);
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if (IS_ERR(q6v5->state)) {
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dev_err(&pdev->dev, "failed to acquire stop state\n");
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return PTR_ERR(q6v5->state);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(qcom_q6v5_init);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Q6V5");
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