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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id c203sm5612676pfc.10.2020.11.26.13.06.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Nov 2020 13:06:58 -0800 (PST) From: Mathieu Poirier To: ohad@wizery.com, bjorn.andersson@linaro.org, robh+dt@kernel.org Cc: linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, arnaud.pouliquen@st.com Subject: [PATCH v3 15/15] remoteproc: Refactor rproc delete and cdev release path Date: Thu, 26 Nov 2020 14:06:42 -0700 Message-Id: <20201126210642.897302-16-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201126210642.897302-1-mathieu.poirier@linaro.org> References: <20201126210642.897302-1-mathieu.poirier@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Refactor function rproc_del() and rproc_cdev_release() to take into account the policy specified in the device tree. Signed-off-by: Mathieu Poirier --- drivers/remoteproc/remoteproc_cdev.c | 13 +++++++++++- drivers/remoteproc/remoteproc_core.c | 30 ++++++++++++++++++++++++++-- include/linux/remoteproc.h | 4 ++++ 3 files changed, 44 insertions(+), 3 deletions(-) -- 2.25.1 diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c index f7645f289563..3dfe555dfc07 100644 --- a/drivers/remoteproc/remoteproc_cdev.c +++ b/drivers/remoteproc/remoteproc_cdev.c @@ -88,7 +88,18 @@ static int rproc_cdev_release(struct inode *inode, struct file *filp) { struct rproc *rproc = container_of(inode->i_cdev, struct rproc, cdev); - if (rproc->cdev_put_on_release && rproc->state == RPROC_RUNNING) + if (!rproc->cdev_put_on_release) + return 0; + + /* + * The application has crashed or is releasing its file handle. Detach + * or shutdown the remote processor based on the policy specified in the + * DT. No need to check rproc->state right away, it will be done + * in either rproc_detach() or rproc_shutdown(). + */ + if (rproc->autonomous_on_core_shutdown) + rproc_detach(rproc); + else rproc_shutdown(rproc); return 0; diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 3d7d245edc4e..1a170103bf27 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -2294,6 +2294,22 @@ static int rproc_alloc_ops(struct rproc *rproc, const struct rproc_ops *ops) return 0; } +static void rproc_set_automation_flags(struct rproc *rproc) +{ + struct device *dev = rproc->dev.parent; + struct device_node *np = dev->of_node; + bool core_shutdown; + + /* + * When function rproc_cdev_release() or rproc_del() are called and + * the remote processor has been attached to, it will be detached from + * (rather than turned off) if "autonomous-on-core-shutdown is specified + * in the DT. + */ + core_shutdown = of_property_read_bool(np, "autonomous-on-core-shutdown"); + rproc->autonomous_on_core_shutdown = core_shutdown; +} + /** * rproc_alloc() - allocate a remote processor handle * @dev: the underlying device @@ -2352,6 +2368,8 @@ struct rproc *rproc_alloc(struct device *dev, const char *name, if (rproc_alloc_ops(rproc, ops)) goto put_device; + rproc_set_automation_flags(rproc); + /* Assign a unique device index and name */ rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL); if (rproc->index < 0) { @@ -2435,8 +2453,16 @@ int rproc_del(struct rproc *rproc) if (!rproc) return -EINVAL; - /* TODO: make sure this works with rproc->power > 1 */ - rproc_shutdown(rproc); + /* + * TODO: make sure this works with rproc->power > 1 + * + * No need to check rproc->state right away, it will be done in either + * rproc_detach() or rproc_shutdown(). + */ + if (rproc->autonomous_on_core_shutdown) + rproc_detach(rproc); + else + rproc_shutdown(rproc); mutex_lock(&rproc->lock); rproc->state = RPROC_DELETED; diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index 02312096d59f..5702f630d810 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -516,6 +516,9 @@ struct rproc_dump_segment { * @nb_vdev: number of vdev currently handled by rproc * @char_dev: character device of the rproc * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release + * @autonomous_on_core_shutdown: true if the remote processor should be detached + * from (rather than turned off) when the remoteproc + * core goes away. */ struct rproc { struct list_head node; @@ -554,6 +557,7 @@ struct rproc { u16 elf_machine; struct cdev cdev; bool cdev_put_on_release; + bool autonomous_on_core_shutdown; }; /**