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authorLee Jones <lee.jones@linaro.org>2016-05-05 16:29:39 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2016-05-06 21:46:36 +0300
commit3d87fa1d47c10c71684e1eca15cb051746ab1d56 (patch)
tree03d70b9ead994d59d25067990b99b43c08c9fb87 /drivers/remoteproc
parent9735a22799b9214d17d3c231fe377fc852f042e9 (diff)
downloadlinux-3d87fa1d47c10c71684e1eca15cb051746ab1d56.tar.xz
remoteproc: core: Task sync during rproc_fw_boot()
By default, rproc_fw_boot() needs to wait for rproc to be configured, but a race may occur when using rpmsg/virtio. In this case, it can be called locally in a safe manor. This patch represents two usecases: - External call (via exported rproc_boot()), which waits - Internal call can use 'nowait' version of rproc_boot() Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/remoteproc_core.c29
-rw-r--r--drivers/remoteproc/remoteproc_internal.h1
-rw-r--r--drivers/remoteproc/remoteproc_virtio.c2
3 files changed, 29 insertions, 3 deletions
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 3d7d58a109d8..1210d6db40b1 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1030,8 +1030,9 @@ static void rproc_crash_handler_work(struct work_struct *work)
}
/**
- * rproc_boot() - boot a remote processor
+ * __rproc_boot() - boot a remote processor
* @rproc: handle of a remote processor
+ * @wait: wait for rproc registration completion
*
* Boot a remote processor (i.e. load its firmware, power it on, ...).
*
@@ -1040,7 +1041,7 @@ static void rproc_crash_handler_work(struct work_struct *work)
*
* Returns 0 on success, and an appropriate error value otherwise.
*/
-int rproc_boot(struct rproc *rproc)
+static int __rproc_boot(struct rproc *rproc, bool wait)
{
const struct firmware *firmware_p;
struct device *dev;
@@ -1088,6 +1089,10 @@ int rproc_boot(struct rproc *rproc)
goto downref_rproc;
}
+ /* if rproc virtio is not yet configured, wait */
+ if (wait)
+ wait_for_completion(&rproc->firmware_loading_complete);
+
ret = rproc_fw_boot(rproc, firmware_p);
release_firmware(firmware_p);
@@ -1101,9 +1106,29 @@ unlock_mutex:
mutex_unlock(&rproc->lock);
return ret;
}
+
+/**
+ * rproc_boot() - boot a remote processor
+ * @rproc: handle of a remote processor
+ */
+int rproc_boot(struct rproc *rproc)
+{
+ return __rproc_boot(rproc, true);
+}
EXPORT_SYMBOL(rproc_boot);
/**
+ * rproc_boot_nowait() - boot a remote processor
+ * @rproc: handle of a remote processor
+ *
+ * Same as rproc_boot() but don't wait for rproc registration completion
+ */
+int rproc_boot_nowait(struct rproc *rproc)
+{
+ return __rproc_boot(rproc, false);
+}
+
+/**
* rproc_shutdown() - power off the remote processor
* @rproc: the remote processor
*
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 8041b95cb058..57e1de59bec8 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -48,6 +48,7 @@ struct rproc_fw_ops {
/* from remoteproc_core.c */
void rproc_release(struct kref *kref);
irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
+int rproc_boot_nowait(struct rproc *rproc);
/* from remoteproc_virtio.c */
int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id);
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index e44872fb9e5e..cc91556313e1 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -161,7 +161,7 @@ static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
}
/* now that the vqs are all set, boot the remote processor */
- ret = rproc_boot(rproc);
+ ret = rproc_boot_nowait(rproc);
if (ret) {
dev_err(&rproc->dev, "rproc_boot() failed %d\n", ret);
goto error;