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From:   Arnaud Pouliquen <arnaud.pouliquen@st.com>
To:     Bjorn Andersson <bjorn.andersson@linaro.org>,
        Ohad Ben-Cohen <ohad@wizery.com>,
        Mathieu Poirier <mathieu.poirier@linaro.org>
CC:     <linux-remoteproc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        <arnaud.pouliquen@st.com>
Subject: [RFC 03/18] remoteproc: Move rvdev management in rproc_virtio
Date:   Thu, 16 Apr 2020 18:13:16 +0200
Message-ID: <20200416161331.7606-4-arnaud.pouliquen@st.com>
In-Reply-To: <20200416161331.7606-1-arnaud.pouliquen@st.com>
References: <20200416161331.7606-1-arnaud.pouliquen@st.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Migrate the management of the rvdev device and subdev from core
to virtio, to prepare the rpmsg virtio platform device creation.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 drivers/remoteproc/remoteproc_core.c     | 118 +-------------------
 drivers/remoteproc/remoteproc_internal.h |   5 +-
 drivers/remoteproc/remoteproc_virtio.c   | 136 +++++++++++++++++++++--
 3 files changed, 131 insertions(+), 128 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 5c90d569c0f7..4fcd685cbfd8 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -371,8 +371,7 @@ int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
 	return 0;
 }
 
-static int
-rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
+int rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
 {
 	struct rproc *rproc = rvdev->rproc;
 	struct device *dev = &rproc->dev;
@@ -410,117 +409,6 @@ void rproc_free_vring(struct rproc_vring *rvring)
 	rsc->vring[idx].notifyid = -1;
 }
 
-static int rproc_vdev_do_start(struct rproc_subdev *subdev)
-{
-	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
-
-	return rproc_add_virtio_dev(rvdev, rvdev->id);
-}
-
-static void rproc_vdev_do_stop(struct rproc_subdev *subdev, bool crashed)
-{
-	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
-	int ret;
-
-	ret = device_for_each_child(&rvdev->dev, NULL, rproc_remove_virtio_dev);
-	if (ret)
-		dev_warn(&rvdev->dev, "can't remove vdev child device: %d\n", ret);
-}
-
-/**
- * rproc_rvdev_release() - release the existence of a rvdev
- *
- * @dev: the subdevice's dev
- */
-static void rproc_rvdev_release(struct device *dev)
-{
-	struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev);
-
-	of_reserved_mem_device_release(dev);
-
-	kfree(rvdev);
-}
-
-static int rproc_rvdev_add_device(struct rproc_vdev *rvdev)
-{
-	struct rproc *rproc = rvdev->rproc;
-	struct fw_rsc_vdev *rsc = rvdev->rsc;
-	char name[16];
-	int ret, i;
-
-	/* Initialise vdev subdevice */
-	snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
-	rvdev->dev.parent = &rproc->dev;
-	rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset;
-	rvdev->dev.release = rproc_rvdev_release;
-	dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
-	dev_set_drvdata(&rvdev->dev, rvdev);
-
-	ret = device_register(&rvdev->dev);
-	if (ret) {
-		put_device(&rvdev->dev);
-		return ret;
-	}
-	/* Make device dma capable by inheriting from parent's capabilities */
-	set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));
-
-	ret = dma_coerce_mask_and_coherent(&rvdev->dev,
-					   dma_get_mask(rproc->dev.parent));
-	if (ret) {
-		dev_warn(&rvdev->dev,
-			 "Failed to set DMA mask %llx. Trying to continue... %x\n",
-			 dma_get_mask(rproc->dev.parent), ret);
-	}
-
-	/* parse the vrings */
-	for (i = 0; i < rsc->num_of_vrings; i++) {
-		ret = rproc_parse_vring(rvdev, rsc, i);
-		if (ret)
-			goto free_rvdev;
-	}
-
-	/* allocate the vring resources */
-	for (i = 0; i < rsc->num_of_vrings; i++) {
-		ret = rproc_alloc_vring(rvdev, i);
-		if (ret)
-			goto free_vg;
-	}
-
-	rvdev->subdev.start = rproc_vdev_do_start;
-	rvdev->subdev.stop = rproc_vdev_do_stop;
-
-	rproc_add_subdev(rproc, &rvdev->subdev);
-
-	return 0;
-
-free_vg:
-	for (i--; i >= 0; i--) {
-		struct rproc_vring *rvring = &rvdev->vring[i];
-
-		rproc_free_vring(rvring);
-	}
-
-free_rvdev:
-	device_unregister(&rvdev->dev);
-
-	return ret;
-}
-
-static void rproc_rvdev_remove_device(struct rproc_vdev *rvdev)
-{
-	struct rproc *rproc = rvdev->rproc;
-	struct rproc_vring *rvring;
-	int id;
-
-	for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
-		rvring = &rvdev->vring[id];
-		rproc_free_vring(rvring);
-	}
-
-	rproc_remove_subdev(rproc, &rvdev->subdev);
-	device_unregister(&rvdev->dev);
-}
-
 /**
  * rproc_handle_vdev() - handle a vdev fw resource
  * @rproc: the remote processor
@@ -590,14 +478,14 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
 
 	list_add_tail(&rvdev->node, &rproc->rvdevs);
 
-	return rproc_rvdev_add_device(rvdev);
+	return rproc_virtio_device_add(rvdev);
 }
 
 void rproc_vdev_release(struct kref *ref)
 {
 	struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
 
-	rproc_rvdev_remove_device(rvdev);
+	rproc_virtio_device_remove(rvdev);
 	list_del(&rvdev->node);
 }
 
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 493ef9262411..fad95f1a50c1 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -30,8 +30,8 @@ irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
 void rproc_vdev_release(struct kref *ref);
 
 /* from remoteproc_virtio.c */
-int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id);
-int rproc_remove_virtio_dev(struct device *dev, void *data);
+int rproc_virtio_device_add(struct rproc_vdev *rvdev);
+void rproc_virtio_device_remove(struct rproc_vdev *rvdev);
 
 /* from remoteproc_debugfs.c */
 void rproc_remove_trace_file(struct dentry *tfile);
@@ -47,6 +47,7 @@ extern struct class rproc_class;
 int rproc_init_sysfs(void);
 void rproc_exit_sysfs(void);
 
+int rproc_parse_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i);
 void rproc_free_vring(struct rproc_vring *rvring);
 int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
 
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 8c07cb2ca8ba..0f7efac7d4f3 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -296,6 +296,20 @@ static const struct virtio_config_ops rproc_virtio_config_ops = {
 	.set		= rproc_virtio_set,
 };
 
+/**
+ * rproc_rvdev_release() - release the existence of a rvdev
+ *
+ * @dev: the subdevice's dev
+ */
+static void rproc_virtio_rvdev_release(struct device *dev)
+{
+	struct rproc_vdev *rvdev = container_of(dev, struct rproc_vdev, dev);
+
+	of_reserved_mem_device_release(dev);
+
+	kfree(rvdev);
+}
+
 /*
  * This function is called whenever vdev is released, and is responsible
  * to decrement the remote processor's refcount which was taken when vdev was
@@ -318,16 +332,18 @@ static void rproc_virtio_dev_release(struct device *dev)
 }
 
 /**
- * rproc_add_virtio_dev() - register an rproc-induced virtio device
- * @rvdev: the remote vdev
+ * rproc_vdev_start() - register an rproc-induced virtio device
+ * @subdev: the rproc virtio subdevice
  *
  * This function registers a virtio device. This vdev's partent is
  * the rproc device.
  *
  * Returns 0 on success or an appropriate error value otherwise.
  */
-int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
+static int rproc_vitio_start(struct rproc_subdev *subdev)
 {
+	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev,
+						subdev);
 	struct rproc *rproc = rvdev->rproc;
 	struct device *dev = &rvdev->dev;
 	struct virtio_device *vdev;
@@ -376,7 +392,7 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
 		ret = -ENOMEM;
 		goto out;
 	}
-	vdev->id.device	= id,
+	vdev->id.device	= rvdev->id,
 	vdev->config = &rproc_virtio_config_ops,
 	vdev->dev.parent = dev;
 	vdev->dev.release = rproc_virtio_dev_release;
@@ -401,23 +417,121 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
 		goto out;
 	}
 
-	dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
+	dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev),
+		 rvdev->id);
 
 out:
 	return ret;
 }
 
+static int rproc_remove_virtio_dev(struct device *dev, void *data)
+{
+	struct virtio_device *vdev = dev_to_virtio(dev);
+	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+	struct rproc_vring *rvring;
+	int id;
+
+	unregister_virtio_device(vdev);
+
+	for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
+		rvring = &rvdev->vring[id];
+		rproc_free_vring(rvring);
+	}
+
+	return 0;
+}
 /**
  * rproc_remove_virtio_dev() - remove an rproc-induced virtio device
- * @dev: the virtio device
- * @data: must be null
+ * @subdev: the rproc virtio subdevice
+ * @crashed: indicate if the stop is the result of a crash
  *
- * This function unregisters an existing virtio device.
+ * This function unregisters existing virtio devices.
  */
-int rproc_remove_virtio_dev(struct device *dev, void *data)
+static void rproc_vitio_stop(struct rproc_subdev *subdev, bool crashed)
 {
-	struct virtio_device *vdev = dev_to_virtio(dev);
+	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev,
+						subdev);
+	int ret;
+
+	ret = device_for_each_child(&rvdev->dev, NULL, rproc_remove_virtio_dev);
+	if (ret)
+		dev_warn(&rvdev->dev, "can't remove vdev child device: %d\n",
+			 ret);
+}
+
+static const struct rproc_subdev rproc_virtio_subdev = {
+	.start		= rproc_vitio_start,
+	.stop		= rproc_vitio_stop
+};
+
+int rproc_virtio_device_add(struct rproc_vdev *rvdev)
+{
+	struct rproc *rproc = rvdev->rproc;
+	struct fw_rsc_vdev *rsc = rvdev->rsc;
+	char name[16];
+	int ret, i;
+
+	/* Initialise vdev subdevice */
+	snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index);
+	rvdev->dev.parent = &rproc->dev;
+	rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset;
+	rvdev->dev.release = rproc_virtio_rvdev_release;
+	dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name);
+	dev_set_drvdata(&rvdev->dev, rvdev);
+
+	ret = device_register(&rvdev->dev);
+	if (ret) {
+		put_device(&rvdev->dev);
+		return ret;
+	}
+	/* Make device dma capable by inheriting from parent's capabilities */
+	set_dma_ops(&rvdev->dev, get_dma_ops(rproc->dev.parent));
+
+	ret = dma_coerce_mask_and_coherent(&rvdev->dev,
+					   dma_get_mask(rproc->dev.parent));
+	if (ret) {
+		dev_warn(&rvdev->dev,
+			 "Failed to set DMA mask %llx. Trying to continue... %x\n",
+			 dma_get_mask(rproc->dev.parent), ret);
+	}
+
+	/* parse the vrings */
+	for (i = 0; i < rsc->num_of_vrings; i++) {
+		ret = rproc_parse_vring(rvdev, rsc, i);
+		if (ret)
+			goto free_rvdev;
+	}
+
+	/* allocate the vring resources */
+	for (i = 0; i < rsc->num_of_vrings; i++) {
+		ret = rproc_alloc_vring(rvdev, i);
+		if (ret)
+			goto free_vg;
+	}
+
+	rvdev->subdev = rproc_virtio_subdev;
+
+	rproc_add_subdev(rproc, &rvdev->subdev);
 
-	unregister_virtio_device(vdev);
 	return 0;
+
+free_vg:
+	for (i--; i >= 0; i--) {
+		struct rproc_vring *rvring = &rvdev->vring[i];
+
+		rproc_free_vring(rvring);
+	}
+
+free_rvdev:
+	device_unregister(&rvdev->dev);
+
+	return ret;
+}
+
+void rproc_virtio_device_remove(struct rproc_vdev *rvdev)
+{
+	struct rproc *rproc = rvdev->rproc;
+
+	rproc_remove_subdev(rproc, &rvdev->subdev);
+	device_unregister(&rvdev->dev);
 }
-- 
2.17.1