From: Vincent Whitchurch vincent.whitchurch@axis.com
[ Upstream commit db0dd9cee82270e032123169ceff659eced5115d ]
Allow the virtio_uml device to be probed from the devicetree so that sub-devices can be specified using the standard virtio bindings, for example:
virtio@1 { compatible = "virtio,uml"; socket-path = "i2c.sock"; virtio-device-id = <0x22>;
i2c-controller { compatible = "virtio,device22"; #address-cells = <0x01>; #size-cells = <0x00>;
light-sensor@01 { compatible = "ti,opt3001"; reg = <0x01>; }; }; };
Signed-off-by: Vincent Whitchurch vincent.whitchurch@axis.com Signed-off-by: Richard Weinberger richard@nod.at Signed-off-by: Sasha Levin sashal@kernel.org --- arch/um/drivers/virtio_uml.c | 50 +++++++++++++++++++++++++++++++++--- 1 file changed, 47 insertions(+), 3 deletions(-)
diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c index 7755cb4ff9fc..ba562d68dc04 100644 --- a/arch/um/drivers/virtio_uml.c +++ b/arch/um/drivers/virtio_uml.c @@ -21,6 +21,7 @@ * Based on Virtio MMIO driver by Pawel Moll, copyright 2011-2014, ARM Ltd. */ #include <linux/module.h> +#include <linux/of.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/virtio.h> @@ -49,6 +50,7 @@ struct virtio_uml_platform_data { struct virtio_uml_device { struct virtio_device vdev; struct platform_device *pdev; + struct virtio_uml_platform_data *pdata;
spinlock_t sock_lock; int sock, req_fd, irq; @@ -149,7 +151,7 @@ static int vhost_user_recv(struct virtio_uml_device *vu_dev, if (rc == -ECONNRESET && vu_dev->registered) { struct virtio_uml_platform_data *pdata;
- pdata = vu_dev->pdev->dev.platform_data; + pdata = vu_dev->pdata;
virtio_break_device(&vu_dev->vdev); schedule_work(&pdata->conn_broken_wk); @@ -1115,21 +1117,63 @@ void virtio_uml_set_no_vq_suspend(struct virtio_device *vdev, no_vq_suspend ? "dis" : "en"); }
+static void vu_of_conn_broken(struct work_struct *wk) +{ + /* + * We can't remove the device from the devicetree so the only thing we + * can do is warn. + */ + WARN_ON(1); +} + /* Platform device */
+static struct virtio_uml_platform_data * +virtio_uml_create_pdata(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct virtio_uml_platform_data *pdata; + int ret; + + if (!np) + return ERR_PTR(-EINVAL); + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + INIT_WORK(&pdata->conn_broken_wk, vu_of_conn_broken); + pdata->pdev = pdev; + + ret = of_property_read_string(np, "socket-path", &pdata->socket_path); + if (ret) + return ERR_PTR(ret); + + ret = of_property_read_u32(np, "virtio-device-id", + &pdata->virtio_device_id); + if (ret) + return ERR_PTR(ret); + + return pdata; +} + static int virtio_uml_probe(struct platform_device *pdev) { struct virtio_uml_platform_data *pdata = pdev->dev.platform_data; struct virtio_uml_device *vu_dev; int rc;
- if (!pdata) - return -EINVAL; + if (!pdata) { + pdata = virtio_uml_create_pdata(pdev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + }
vu_dev = kzalloc(sizeof(*vu_dev), GFP_KERNEL); if (!vu_dev) return -ENOMEM;
+ vu_dev->pdata = pdata; vu_dev->vdev.dev.parent = &pdev->dev; vu_dev->vdev.dev.release = virtio_uml_release_dev; vu_dev->vdev.config = &virtio_uml_config_ops;