[PATCH 1/4] remoteproc: Introduce always-on flag

[Bjorn Andersson]

Introduce an "always-on" flag on rprocs to make it possible to flag
remote processors without vdevs to automatically boot once the firmware
is found.

Cc: Lee Jones <lee.jo...@linaro.org>
Cc: Loic Pallardy <loic.palla...@st.com>
Signed-off-by: Bjorn Andersson <bjorn.anders...@linaro.org>
---
 drivers/remoteproc/remoteproc_core.c   | 27 ++++++++++++++++++++++++++-
 drivers/remoteproc/remoteproc_virtio.c | 13 -------------
 include/linux/remoteproc.h             |  1 +
 3 files changed, 27 insertions(+), 14 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c 
b/drivers/remoteproc/remoteproc_core.c
index fe0539ed9cb5..7e7f24fcac69 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -933,6 +933,10 @@ static void rproc_fw_config_virtio(const struct firmware 
*fw, void *context)
        /* look for virtio devices and register them */
        ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler);
 
+       /* if rproc is marked always-on, request it to boot */
+       if (rproc->always_on)
+               rproc_boot_nowait(rproc);
+
 out:
        release_firmware(fw);
        /* allow rproc_del() contexts, if any, to proceed */
@@ -978,11 +982,16 @@ static int rproc_add_virtio_devices(struct rproc *rproc)
 int rproc_trigger_recovery(struct rproc *rproc)
 {
        struct rproc_vdev *rvdev, *rvtmp;
+       int ret;
 
        dev_err(&rproc->dev, "recovering %s\n", rproc->name);
 
        init_completion(&rproc->crash_comp);
 
+       /* shut down the remote */
+       /* TODO: make sure this works with rproc->power > 1 */
+       rproc_shutdown(rproc);
+
        /* clean up remote vdev entries */
        list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
                rproc_remove_virtio_dev(rvdev);
@@ -993,7 +1002,17 @@ int rproc_trigger_recovery(struct rproc *rproc)
        /* Free the copy of the resource table */
        kfree(rproc->cached_table);
 
-       return rproc_add_virtio_devices(rproc);
+       ret = rproc_add_virtio_devices(rproc);
+       if (ret)
+               return ret;
+
+       /*
+        * boot the remote processor up again, waiting for the async fw load to
+        * finish
+        */
+       rproc_boot(rproc);
+
+       return 0;
 }
 
 /**
@@ -1374,6 +1393,7 @@ struct rproc *rproc_alloc(struct device *dev, const char 
*name,
        rproc->name = name;
        rproc->ops = ops;
        rproc->priv = &rproc[1];
+       rproc->always_on = true;
 
        device_initialize(&rproc->dev);
        rproc->dev.parent = dev;
@@ -1452,6 +1472,11 @@ int rproc_del(struct rproc *rproc)
        /* if rproc is just being registered, wait */
        wait_for_completion(&rproc->firmware_loading_complete);
 
+       /* if rproc is marked always-on, rproc_add() booted it */
+       /* TODO: make sure this works with rproc->power > 1 */
+       if (rproc->always_on)
+               rproc_shutdown(rproc);
+
        /* clean up remote vdev entries */
        list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node)
                rproc_remove_virtio_dev(rvdev);
diff --git a/drivers/remoteproc/remoteproc_virtio.c 
b/drivers/remoteproc/remoteproc_virtio.c
index cc91556313e1..574c90ce07f7 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -136,11 +136,6 @@ static void __rproc_virtio_del_vqs(struct virtio_device 
*vdev)
 
 static void rproc_virtio_del_vqs(struct virtio_device *vdev)
 {
-       struct rproc *rproc = vdev_to_rproc(vdev);
-
-       /* power down the remote processor before deleting vqs */
-       rproc_shutdown(rproc);
-
        __rproc_virtio_del_vqs(vdev);
 }
 
@@ -149,7 +144,6 @@ static int rproc_virtio_find_vqs(struct virtio_device 
*vdev, unsigned nvqs,
                       vq_callback_t *callbacks[],
                       const char * const names[])
 {
-       struct rproc *rproc = vdev_to_rproc(vdev);
        int i, ret;
 
        for (i = 0; i < nvqs; ++i) {
@@ -160,13 +154,6 @@ 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_nowait(rproc);
-       if (ret) {
-               dev_err(&rproc->dev, "rproc_boot() failed %d\n", ret);
-               goto error;
-       }
-
        return 0;
 
 error:
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 1c457a8dd5a6..bd1cfcbb57b9 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -443,6 +443,7 @@ struct rproc {
        struct resource_table *cached_table;
        u32 table_csum;
        bool has_iommu;
+       bool always_on;
 };
 
 /* we currently support only two vrings per rvdev */
-- 
2.5.0