remoteproc: Introduce function rproc_detach()
Introduce function rproc_detach() to enable the remoteproc core to release the resources associated with a remote processor without stopping its operation. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com> Link: https://lore.kernel.org/r/20210312162453.1234145-11-mathieu.poirier@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
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@ -1715,7 +1715,7 @@ static int rproc_stop(struct rproc *rproc, bool crashed)
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/*
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/*
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* __rproc_detach(): Does the opposite of __rproc_attach()
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* __rproc_detach(): Does the opposite of __rproc_attach()
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*/
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*/
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static int __maybe_unused __rproc_detach(struct rproc *rproc)
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static int __rproc_detach(struct rproc *rproc)
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{
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{
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struct device *dev = &rproc->dev;
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struct device *dev = &rproc->dev;
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int ret;
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int ret;
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@ -1954,6 +1954,62 @@ out:
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}
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}
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EXPORT_SYMBOL(rproc_shutdown);
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EXPORT_SYMBOL(rproc_shutdown);
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/**
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* rproc_detach() - Detach the remote processor from the
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* remoteproc core
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*
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* @rproc: the remote processor
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*
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* Detach a remote processor (previously attached to with rproc_attach()).
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*
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* In case @rproc is still being used by an additional user(s), then
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* this function will just decrement the power refcount and exit,
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* without disconnecting the device.
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*
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* Function rproc_detach() calls __rproc_detach() in order to let a remote
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* processor know that services provided by the application processor are
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* no longer available. From there it should be possible to remove the
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* platform driver and even power cycle the application processor (if the HW
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* supports it) without needing to switch off the remote processor.
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*/
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int rproc_detach(struct rproc *rproc)
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{
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struct device *dev = &rproc->dev;
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int ret;
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ret = mutex_lock_interruptible(&rproc->lock);
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if (ret) {
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dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
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return ret;
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}
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/* if the remote proc is still needed, bail out */
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if (!atomic_dec_and_test(&rproc->power)) {
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ret = 0;
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goto out;
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}
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ret = __rproc_detach(rproc);
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if (ret) {
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atomic_inc(&rproc->power);
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goto out;
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}
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/* clean up all acquired resources */
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rproc_resource_cleanup(rproc);
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/* release HW resources if needed */
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rproc_unprepare_device(rproc);
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rproc_disable_iommu(rproc);
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rproc->table_ptr = NULL;
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out:
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mutex_unlock(&rproc->lock);
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return ret;
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}
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EXPORT_SYMBOL(rproc_detach);
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/**
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/**
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* rproc_get_by_phandle() - find a remote processor by phandle
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* rproc_get_by_phandle() - find a remote processor by phandle
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* @phandle: phandle to the rproc
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* @phandle: phandle to the rproc
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@ -664,6 +664,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
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int rproc_boot(struct rproc *rproc);
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int rproc_boot(struct rproc *rproc);
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void rproc_shutdown(struct rproc *rproc);
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void rproc_shutdown(struct rproc *rproc);
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int rproc_detach(struct rproc *rproc);
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int rproc_set_firmware(struct rproc *rproc, const char *fw_name);
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int rproc_set_firmware(struct rproc *rproc, const char *fw_name);
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void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
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void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
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void rproc_coredump_using_sections(struct rproc *rproc);
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void rproc_coredump_using_sections(struct rproc *rproc);
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