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Fri, 26 Feb 2021 17:15:35 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 11C8C10002A; Fri, 26 Feb 2021 17:15:34 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 051742BA2AE; Fri, 26 Feb 2021 17:15:34 +0100 (CET) Received: from lmecxl0889.lme.st.com (10.75.127.49) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 26 Feb 2021 17:15:33 +0100 Subject: Re: [PATCH v6 10/16] remoteproc: Introduce function rproc_detach() To: Mathieu Poirier , , , References: <20210223233515.3468677-1-mathieu.poirier@linaro.org> <20210223233515.3468677-11-mathieu.poirier@linaro.org> From: Arnaud POULIQUEN Message-ID: <2d49ff33-ac0b-c609-9845-0b03c9e11586@foss.st.com> Date: Fri, 26 Feb 2021 17:15:32 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210223233515.3468677-11-mathieu.poirier@linaro.org> Content-Language: en-US X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG3NODE2.st.com (10.75.127.8) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369, 18.0.761 definitions=2021-02-26_05:2021-02-26, 2021-02-26 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210226_111538_706965_6F5A8B32 X-CRM114-Status: GOOD ( 30.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-remoteproc@vger.kernel.org, alexandre.torgue@st.com, mcoquelin.stm32@gmail.com, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/24/21 12:35 AM, Mathieu Poirier wrote: > 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 Reviewed-by: Arnaud Pouliquen Thanks, > --- > New for V6: > - Checking for rproc->state has been removed. They have been moved to > calling functions. > - Freeing the cache table has been moved to the next patch, i.e 11/16. > --- > > 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 0f680b7ff8f1..fc01b29290a6 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); > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel