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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 09/17] remoteproc: Introduce function __rproc_detach()
Date: Fri, 12 Mar 2021 09:24:45 -0700	[thread overview]
Message-ID: <20210312162453.1234145-10-mathieu.poirier@linaro.org> (raw)
In-Reply-To: <20210312162453.1234145-1-mathieu.poirier@linaro.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 <mathieu.poirier@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 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
-- 
2.25.1


WARNING: multiple messages have this Message-ID
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 09/17] remoteproc: Introduce function __rproc_detach()
Date: Fri, 12 Mar 2021 09:24:45 -0700	[thread overview]
Message-ID: <20210312162453.1234145-10-mathieu.poirier@linaro.org> (raw)
In-Reply-To: <20210312162453.1234145-1-mathieu.poirier@linaro.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 <mathieu.poirier@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 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
-- 
2.25.1


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  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 ` Mathieu Poirier [this message]
2021-03-12 16:24   ` [PATCH v8 09/17] remoteproc: Introduce function __rproc_detach() Mathieu Poirier
2021-03-12 16:24 ` [PATCH v8 10/17] remoteproc: Introduce function rproc_detach() Mathieu Poirier
2021-03-12 16:24   ` 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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