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Date: Thu, 25 May 2017 17:39:59 -0700
From: Sarangdhar Joshi <spjoshi@...eaurora.org>
To: Ohad Ben-Cohen <ohad@...ery.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Loic Pallardy <loic.pallardy@...com>
Cc: Sarangdhar Joshi <spjoshi@...eaurora.org>,
linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-arm-msm@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
Trilok Soni <tsoni@...eaurora.org>
Subject: [PATCH v2 1/2] remoteproc: Introduce rproc_{start,stop}() functions
In the context of recovering from crash, rproc_trigger_recovery() does
rproc_shutdown() followed by rproc_boot(). The remoteproc resources are
cleaned up in rproc_shutdown() and immediately reallocated in
rproc_boot() which is an unnecessary overhead. Furthermore, we want the
memory regions to be accessible after stopping the remote processor, to
be able to extract the memory content for a coredump.
This patch factors out the code in rproc_boot() and rproc_shutdown()
path and introduces rproc_{start,stop}() in order to avoid resource
allocation overhead.
Signed-off-by: Sarangdhar Joshi <spjoshi@...eaurora.org>
---
Changes from v1:
* Spliced the patches to separate rproc_{start,stop}() code from changing
the behavior of the recovery
* Modified commit text to reflect this change
drivers/remoteproc/remoteproc_core.c | 139 +++++++++++++++++++++--------------
1 file changed, 85 insertions(+), 54 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 9fd9ca5..aeb7bdd 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -851,6 +851,61 @@ static void rproc_resource_cleanup(struct rproc *rproc)
kref_put(&rvdev->refcount, rproc_vdev_release);
}
+static int rproc_start(struct rproc *rproc, const struct firmware *fw)
+{
+ struct resource_table *table, *loaded_table;
+ struct device *dev = &rproc->dev;
+ int ret, tablesz;
+
+ /* look for the resource table */
+ table = rproc_find_rsc_table(rproc, fw, &tablesz);
+ if (!table) {
+ dev_err(dev, "Resouce table look up failed\n");
+ return -EINVAL;
+ }
+
+ /* load the ELF segments to memory */
+ ret = rproc_load_segments(rproc, fw);
+ if (ret) {
+ dev_err(dev, "Failed to load program segments: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * The starting device has been given the rproc->table_ptr as the
+ * resource table. The address of the vring along with the other
+ * allocated resources (carveouts etc) is stored in table_ptr.
+ * In order to pass this information to the remote device we must copy
+ * this information to device memory. We also update the table_ptr so
+ * that any subsequent changes will be applied to the loaded version.
+ */
+ loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
+ if (loaded_table)
+ memcpy(loaded_table, rproc->table_ptr, tablesz);
+
+ /* power up the remote processor */
+ ret = rproc->ops->start(rproc);
+ if (ret) {
+ dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
+ return ret;
+ }
+
+ /* probe any subdevices for the remote processor */
+ ret = rproc_probe_subdevices(rproc);
+ if (ret) {
+ dev_err(dev, "failed to probe subdevices for %s: %d\n",
+ rproc->name, ret);
+ rproc->ops->stop(rproc);
+ return ret;
+ }
+
+ rproc->state = RPROC_RUNNING;
+
+ dev_info(dev, "remote processor %s is now up\n", rproc->name);
+
+ return 0;
+}
+
/*
* take a firmware and boot a remote processor with it.
*/
@@ -858,7 +913,7 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
{
struct device *dev = &rproc->dev;
const char *name = rproc->firmware;
- struct resource_table *table, *loaded_table;
+ struct resource_table *table;
int ret, tablesz;
ret = rproc_fw_sanity_check(rproc, fw);
@@ -907,48 +962,12 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
goto clean_up_resources;
}
- /* load the ELF segments to memory */
- ret = rproc_load_segments(rproc, fw);
- if (ret) {
- dev_err(dev, "Failed to load program segments: %d\n", ret);
- goto clean_up_resources;
- }
-
- /*
- * The starting device has been given the rproc->table_ptr as the
- * resource table. The address of the vring along with the other
- * allocated resources (carveouts etc) is stored in table_ptr.
- * In order to pass this information to the remote device we must copy
- * this information to device memory. We also update the table_ptr so
- * that any subsequent changes will be applied to the loaded version.
- */
- loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
- if (loaded_table)
- memcpy(loaded_table, rproc->table_ptr, tablesz);
-
- /* power up the remote processor */
- ret = rproc->ops->start(rproc);
- if (ret) {
- dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
+ ret = rproc_start(rproc, fw);
+ if (ret)
goto clean_up_resources;
- }
-
- /* probe any subdevices for the remote processor */
- ret = rproc_probe_subdevices(rproc);
- if (ret) {
- dev_err(dev, "failed to probe subdevices for %s: %d\n",
- rproc->name, ret);
- goto stop_rproc;
- }
-
- rproc->state = RPROC_RUNNING;
-
- dev_info(dev, "remote processor %s is now up\n", rproc->name);
return 0;
-stop_rproc:
- rproc->ops->stop(rproc);
clean_up_resources:
rproc_resource_cleanup(rproc);
clean_up:
@@ -993,6 +1012,32 @@ static int rproc_trigger_auto_boot(struct rproc *rproc)
return ret;
}
+static int rproc_stop(struct rproc *rproc)
+{
+ struct device *dev = &rproc->dev;
+ int ret;
+
+ /* remove any subdevices for the remote processor */
+ rproc_remove_subdevices(rproc);
+
+ /* power off the remote processor */
+ ret = rproc->ops->stop(rproc);
+ if (ret) {
+ dev_err(dev, "can't stop rproc: %d\n", ret);
+ return ret;
+ }
+
+ /* if in crash state, unlock crash handler */
+ if (rproc->state == RPROC_CRASHED)
+ complete_all(&rproc->crash_comp);
+
+ rproc->state = RPROC_OFFLINE;
+
+ dev_info(dev, "stopped remote processor %s\n", rproc->name);
+
+ return 0;
+}
+
/**
* rproc_trigger_recovery() - recover a remoteproc
* @rproc: the remote processor
@@ -1163,14 +1208,9 @@ void rproc_shutdown(struct rproc *rproc)
if (!atomic_dec_and_test(&rproc->power))
goto out;
- /* remove any subdevices for the remote processor */
- rproc_remove_subdevices(rproc);
-
- /* power off the remote processor */
- ret = rproc->ops->stop(rproc);
+ ret = rproc_stop(rproc);
if (ret) {
atomic_inc(&rproc->power);
- dev_err(dev, "can't stop rproc: %d\n", ret);
goto out;
}
@@ -1182,15 +1222,6 @@ void rproc_shutdown(struct rproc *rproc)
/* Free the copy of the resource table */
kfree(rproc->table_ptr);
rproc->table_ptr = NULL;
-
- /* if in crash state, unlock crash handler */
- if (rproc->state == RPROC_CRASHED)
- complete_all(&rproc->crash_comp);
-
- rproc->state = RPROC_OFFLINE;
-
- dev_info(dev, "stopped remote processor %s\n", rproc->name);
-
out:
mutex_unlock(&rproc->lock);
}
--
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