From: Mathieu Poirier <mathieu.poirier@linaro.org> To: bjorn.andersson@linaro.org, ohad@wizery.com Cc: arnaud.pouliquen@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v8 10/17] remoteproc: Introduce function rproc_detach() Date: Fri, 12 Mar 2021 09:24:46 -0700 [thread overview] Message-ID: <20210312162453.1234145-11-mathieu.poirier@linaro.org> (raw) In-Reply-To: <20210312162453.1234145-1-mathieu.poirier@linaro.org> 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> --- drivers/remoteproc/remoteproc_core.c | 58 +++++++++++++++++++++++++++- include/linux/remoteproc.h | 1 + 2 files changed, 58 insertions(+), 1 deletion(-) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index f2a005eadfd5..5eaa47c3ba92 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -1709,7 +1709,7 @@ static int rproc_stop(struct rproc *rproc, bool crashed) /* * __rproc_detach(): Does the opposite of __rproc_attach() */ -static int __maybe_unused __rproc_detach(struct rproc *rproc) +static int __rproc_detach(struct rproc *rproc) { struct device *dev = &rproc->dev; int ret; @@ -1948,6 +1948,62 @@ void rproc_shutdown(struct rproc *rproc) } EXPORT_SYMBOL(rproc_shutdown); +/** + * rproc_detach() - Detach the remote processor from the + * remoteproc core + * + * @rproc: the remote processor + * + * Detach a remote processor (previously attached to with rproc_attach()). + * + * In case @rproc is still being used by an additional user(s), then + * this function will just decrement the power refcount and exit, + * without disconnecting the device. + * + * Function rproc_detach() calls __rproc_detach() in order to let a remote + * processor know that services provided by the application processor are + * no longer available. From there it should be possible to remove the + * platform driver and even power cycle the application processor (if the HW + * supports it) without needing to switch off the remote processor. + */ +int rproc_detach(struct rproc *rproc) +{ + struct device *dev = &rproc->dev; + int ret; + + ret = mutex_lock_interruptible(&rproc->lock); + if (ret) { + dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); + return ret; + } + + /* if the remote proc is still needed, bail out */ + if (!atomic_dec_and_test(&rproc->power)) { + ret = 0; + goto out; + } + + ret = __rproc_detach(rproc); + if (ret) { + atomic_inc(&rproc->power); + goto out; + } + + /* clean up all acquired resources */ + rproc_resource_cleanup(rproc); + + /* release HW resources if needed */ + rproc_unprepare_device(rproc); + + rproc_disable_iommu(rproc); + + rproc->table_ptr = NULL; +out: + mutex_unlock(&rproc->lock); + return ret; +} +EXPORT_SYMBOL(rproc_detach); + /** * rproc_get_by_phandle() - find a remote processor by phandle * @phandle: phandle to the rproc diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index eff55ec72e80..e1c843c19cc6 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -662,6 +662,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len, int rproc_boot(struct rproc *rproc); void rproc_shutdown(struct rproc *rproc); +int rproc_detach(struct rproc *rproc); int rproc_set_firmware(struct rproc *rproc, const char *fw_name); void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type); void rproc_coredump_using_sections(struct rproc *rproc); -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Mathieu Poirier <mathieu.poirier@linaro.org> To: bjorn.andersson@linaro.org, ohad@wizery.com Cc: arnaud.pouliquen@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v8 10/17] remoteproc: Introduce function rproc_detach() Date: Fri, 12 Mar 2021 09:24:46 -0700 [thread overview] Message-ID: <20210312162453.1234145-11-mathieu.poirier@linaro.org> (raw) In-Reply-To: <20210312162453.1234145-1-mathieu.poirier@linaro.org> 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> --- drivers/remoteproc/remoteproc_core.c | 58 +++++++++++++++++++++++++++- include/linux/remoteproc.h | 1 + 2 files changed, 58 insertions(+), 1 deletion(-) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index f2a005eadfd5..5eaa47c3ba92 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -1709,7 +1709,7 @@ static int rproc_stop(struct rproc *rproc, bool crashed) /* * __rproc_detach(): Does the opposite of __rproc_attach() */ -static int __maybe_unused __rproc_detach(struct rproc *rproc) +static int __rproc_detach(struct rproc *rproc) { struct device *dev = &rproc->dev; int ret; @@ -1948,6 +1948,62 @@ void rproc_shutdown(struct rproc *rproc) } EXPORT_SYMBOL(rproc_shutdown); +/** + * rproc_detach() - Detach the remote processor from the + * remoteproc core + * + * @rproc: the remote processor + * + * Detach a remote processor (previously attached to with rproc_attach()). + * + * In case @rproc is still being used by an additional user(s), then + * this function will just decrement the power refcount and exit, + * without disconnecting the device. + * + * Function rproc_detach() calls __rproc_detach() in order to let a remote + * processor know that services provided by the application processor are + * no longer available. From there it should be possible to remove the + * platform driver and even power cycle the application processor (if the HW + * supports it) without needing to switch off the remote processor. + */ +int rproc_detach(struct rproc *rproc) +{ + struct device *dev = &rproc->dev; + int ret; + + ret = mutex_lock_interruptible(&rproc->lock); + if (ret) { + dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret); + return ret; + } + + /* if the remote proc is still needed, bail out */ + if (!atomic_dec_and_test(&rproc->power)) { + ret = 0; + goto out; + } + + ret = __rproc_detach(rproc); + if (ret) { + atomic_inc(&rproc->power); + goto out; + } + + /* clean up all acquired resources */ + rproc_resource_cleanup(rproc); + + /* release HW resources if needed */ + rproc_unprepare_device(rproc); + + rproc_disable_iommu(rproc); + + rproc->table_ptr = NULL; +out: + mutex_unlock(&rproc->lock); + return ret; +} +EXPORT_SYMBOL(rproc_detach); + /** * rproc_get_by_phandle() - find a remote processor by phandle * @phandle: phandle to the rproc diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index eff55ec72e80..e1c843c19cc6 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -662,6 +662,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len, int rproc_boot(struct rproc *rproc); void rproc_shutdown(struct rproc *rproc); +int rproc_detach(struct rproc *rproc); int rproc_set_firmware(struct rproc *rproc, const char *fw_name); void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type); void rproc_coredump_using_sections(struct rproc *rproc); -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-03-12 16:26 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-03-12 16:24 [PATCH v8 00/17] remoteproc: Add support for detaching a remote processor Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 01/17] remoteproc: Remove useless check in rproc_del() Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 02/17] remoteproc: Rename function rproc_actuate() Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 03/17] remoteproc: Add new RPROC_ATTACHED state Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 04/17] remoteproc: Properly represent the attached state Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 05/17] remoteproc: Add new get_loaded_rsc_table() to rproc_ops Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 06/17] remoteproc: stm32: Move resource table setup " Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 07/17] remoteproc: stm32: Move memory parsing " Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 08/17] remoteproc: Add new detach() remoteproc operation Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 09/17] remoteproc: Introduce function __rproc_detach() Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier [this message] 2021-03-12 16:24 ` [PATCH v8 10/17] remoteproc: Introduce function rproc_detach() Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 11/17] remoteproc: Properly deal with the resource table when detaching Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 12/17] remoteproc: Properly deal with the resource table when stopping Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 13/17] remoteproc: Properly deal with a kernel panic when attached Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 14/17] remoteproc: Properly deal with a start request " Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 15/17] remoteproc: Properly deal with a stop " Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 16/17] remoteproc: Properly deal with a detach " Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier 2021-03-12 16:24 ` [PATCH v8 17/17] remoteproc: Refactor function rproc_cdev_release() Mathieu Poirier 2021-03-12 16:24 ` Mathieu Poirier
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