remoteproc: Introduce auto-boot flag

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

Preserve previous behavior of the wkup_m3 processor being explicitly
booted by a consumer.

Cc: Lee Jones <lee.jones@linaro.org>
Cc: Loic Pallardy <loic.pallardy@st.com>
Cc: Suman Anna <s-anna@ti.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

4 files changed, 30 insertions, 14 deletions

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 0f85f7eb476d..d3b812e85250 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -932,6 +932,10 @@ 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->auto_boot)
+                rproc_boot_nowait(rproc);
+
 out:
         release_firmware(fw);
         /* allow rproc_del() contexts, if any, to proceed */
@@ -977,11 +981,16 @@ 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);
@@ -992,7 +1001,18 @@ 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, if the async firmware loader
+         * didn't do so already, waiting for the async fw load to finish
+         */
+        if (!rproc->auto_boot)
+                rproc_boot(rproc);
+
+        return 0;
 }
 
 /**
@@ -1373,6 +1393,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
         rproc->name = name;
         rproc->ops = ops;
         rproc->priv = &rproc[1];
+        rproc->auto_boot = true;
 
         device_initialize(&rproc->dev);
         rproc->dev.parent = dev;
@@ -1451,6 +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->auto_boot)
+                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 93bf00d9c64e..01870a16d6d2 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 int 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 int 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/drivers/remoteproc/wkup_m3_rproc.c b/drivers/remoteproc/wkup_m3_rproc.c
index 02d271d101b4..3811cb522af3 100644
--- a/drivers/remoteproc/wkup_m3_rproc.c
+++ b/drivers/remoteproc/wkup_m3_rproc.c
@@ -167,6 +167,8 @@ static int wkup_m3_rproc_probe(struct platform_device *pdev)
                 goto err;
         }
 
+        rproc->auto_boot = false;
+
         wkupm3 = rproc->priv;
         wkupm3->rproc = rproc;
         wkupm3->pdev = pdev;
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 8229523f70a5..4783c8c4645a 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 auto_boot;
 };
 
 /* we currently support only two vrings per rvdev */