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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id e8sm5899599pgb.35.2021.03.12.08.25.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 08:25:05 -0800 (PST) From: Mathieu Poirier 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 09/17] remoteproc: Introduce function __rproc_detach() Date: Fri, 12 Mar 2021 09:24:45 -0700 Message-Id: <20210312162453.1234145-10-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210312162453.1234145-1-mathieu.poirier@linaro.org> References: <20210312162453.1234145-1-mathieu.poirier@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210312_162507_489348_959AEA32 X-CRM114-Status: GOOD ( 15.48 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Introduce function __rproc_detach() to perform the same kind of operation as rproc_stop(), but instead of switching off the remote processor using rproc->ops->stop(), it uses rproc->ops->detach(). That way it is possible for the core to release the resources associated with a remote processor while the latter is kept operating. Signed-off-by: Mathieu Poirier Reviewed-by: Peng Fan Reviewed-by: Arnaud Pouliquen --- drivers/remoteproc/remoteproc_core.c | 30 ++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 1d8bb588d996..f2a005eadfd5 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -1706,6 +1706,36 @@ static int rproc_stop(struct rproc *rproc, bool crashed) return 0; } +/* + * __rproc_detach(): Does the opposite of __rproc_attach() + */ +static int __maybe_unused __rproc_detach(struct rproc *rproc) +{ + struct device *dev = &rproc->dev; + int ret; + + /* No need to continue if a detach() operation has not been provided */ + if (!rproc->ops->detach) + return -EINVAL; + + /* Stop any subdevices for the remote processor */ + rproc_stop_subdevices(rproc, false); + + /* Tell the remote processor the core isn't available anymore */ + ret = rproc->ops->detach(rproc); + if (ret) { + dev_err(dev, "can't detach from rproc: %d\n", ret); + return ret; + } + + rproc_unprepare_subdevices(rproc); + + rproc->state = RPROC_DETACHED; + + dev_info(dev, "detached remote processor %s\n", rproc->name); + + return 0; +} /** * rproc_trigger_recovery() - recover a remoteproc