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authorAntonios Motakis <a.motakis@virtualopensystems.com>2015-03-16 14:08:43 -0600
committerAlex Williamson <alex.williamson@redhat.com>2015-03-16 14:08:43 -0600
commit9df85aaa43297cb12dc85155695dd1bfdf94f91d (patch)
treeb7a17a5d63ae1d3b6f6412e8251f066421050fb6 /drivers/vfio
parentde49fc0d99e6a8af8be4f56869bdea12976d3551 (diff)
downloadop-kernel-dev-9df85aaa43297cb12dc85155695dd1bfdf94f91d.zip
op-kernel-dev-9df85aaa43297cb12dc85155695dd1bfdf94f91d.tar.gz
vfio: platform: probe to devices on the platform bus
Driver to bind to Linux platform devices, and callbacks to discover their resources to be used by the main VFIO PLATFORM code. Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com> Signed-off-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Reviewed-by: Eric Auger <eric.auger@linaro.org> Tested-by: Eric Auger <eric.auger@linaro.org> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/platform/vfio_platform.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
new file mode 100644
index 0000000..cef645c
--- /dev/null
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2013 - Virtual Open Systems
+ * Author: Antonios Motakis <a.motakis@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/platform_device.h>
+
+#include "vfio_platform_private.h"
+
+#define DRIVER_VERSION "0.10"
+#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
+#define DRIVER_DESC "VFIO for platform devices - User Level meta-driver"
+
+/* probing devices from the linux platform bus */
+
+static struct resource *get_platform_resource(struct vfio_platform_device *vdev,
+ int num)
+{
+ struct platform_device *dev = (struct platform_device *) vdev->opaque;
+ int i;
+
+ for (i = 0; i < dev->num_resources; i++) {
+ struct resource *r = &dev->resource[i];
+
+ if (resource_type(r) & (IORESOURCE_MEM|IORESOURCE_IO)) {
+ if (!num)
+ return r;
+
+ num--;
+ }
+ }
+ return NULL;
+}
+
+static int get_platform_irq(struct vfio_platform_device *vdev, int i)
+{
+ struct platform_device *pdev = (struct platform_device *) vdev->opaque;
+
+ return platform_get_irq(pdev, i);
+}
+
+static int vfio_platform_probe(struct platform_device *pdev)
+{
+ struct vfio_platform_device *vdev;
+ int ret;
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev)
+ return -ENOMEM;
+
+ vdev->opaque = (void *) pdev;
+ vdev->name = pdev->name;
+ vdev->flags = VFIO_DEVICE_FLAGS_PLATFORM;
+ vdev->get_resource = get_platform_resource;
+ vdev->get_irq = get_platform_irq;
+
+ ret = vfio_platform_probe_common(vdev, &pdev->dev);
+ if (ret)
+ kfree(vdev);
+
+ return ret;
+}
+
+static int vfio_platform_remove(struct platform_device *pdev)
+{
+ struct vfio_platform_device *vdev;
+
+ vdev = vfio_platform_remove_common(&pdev->dev);
+ if (vdev) {
+ kfree(vdev);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static struct platform_driver vfio_platform_driver = {
+ .probe = vfio_platform_probe,
+ .remove = vfio_platform_remove,
+ .driver = {
+ .name = "vfio-platform",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(vfio_platform_driver);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
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