This patch introduced the API to return device tree info about
a PLATFORM device (if described by a device tree) and the skeleton
of the implementation for VFIO_PLATFORM. Information about any device
node bound by VFIO_PLATFORM should be queried via the introduced ioctl
VFIO_DEVICE_GET_DEVTREE_INFO.
Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/vfio/platform/Makefile | 2 +-
drivers/vfio/platform/devtree.c | 27 ++++++++++++++++++++++
drivers/vfio/platform/vfio_platform.c | 11 +++++++++
drivers/vfio/platform/vfio_platform_private.h | 7 ++++++
include/uapi/linux/vfio.h | 32 ++++++++++++++++++++++++---
5 files changed, 75 insertions(+), 4 deletions(-)
create mode 100644 drivers/vfio/platform/devtree.c
diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
index 2c53327..4313fd7 100644
--- a/drivers/vfio/platform/Makefile
+++ b/drivers/vfio/platform/Makefile
@@ -1,4 +1,4 @@
-vfio-platform-y := vfio_platform.o vfio_platform_irq.o
+vfio-platform-y := vfio_platform.o vfio_platform_irq.o devtree.o
obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
diff --git a/drivers/vfio/platform/devtree.c b/drivers/vfio/platform/devtree.c
new file mode 100644
index 0000000..91cab88
--- /dev/null
+++ b/drivers/vfio/platform/devtree.c
@@ -0,0 +1,27 @@
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include "vfio_platform_private.h"
+
+void vfio_platform_devtree_get(struct vfio_platform_device *vdev)
+{
+ vdev->of_node = of_node_get(vdev->pdev->dev.of_node);
+}
+
+void vfio_platform_devtree_put(struct vfio_platform_device *vdev)
+{
+ of_node_put(vdev->of_node);
+ vdev->of_node = NULL;
+}
+
+bool vfio_platform_has_devtree(struct vfio_platform_device *vdev)
+{
+ return !!vdev->of_node;
+}
+
+long vfio_platform_devtree_ioctl(struct vfio_platform_device *vdev,
+ unsigned long arg)
+{
+ return -EINVAL; /* not implemented yet */
+}
diff --git a/drivers/vfio/platform/vfio_platform.c b/drivers/vfio/platform/vfio_platform.c
index f4c06c6..e6fe05a 100644
--- a/drivers/vfio/platform/vfio_platform.c
+++ b/drivers/vfio/platform/vfio_platform.c
@@ -26,6 +26,7 @@
#include <linux/vfio.h>
#include <linux/io.h>
#include <linux/platform_device.h>
+#include <linux/of.h>
#include <linux/irq.h>
#include "vfio_platform_private.h"
@@ -66,6 +67,9 @@ static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
vdev->num_regions = cnt;
+ /* get device tree node for info if available */
+ vfio_platform_devtree_get(vdev);
+
return 0;
err:
kfree(vdev->region);
@@ -74,6 +78,7 @@ err:
static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
{
+ vfio_platform_devtree_put(vdev);
vdev->num_regions = 0;
kfree(vdev->region);
}
@@ -132,6 +137,9 @@ static long vfio_platform_ioctl(void *device_data,
return -EINVAL;
info.flags = VFIO_DEVICE_FLAGS_PLATFORM;
+ if (vfio_platform_has_devtree(vdev))
+ info.flags |= VFIO_DEVICE_FLAGS_DEVTREE;
+
info.num_regions = vdev->num_regions;
info.num_irqs = vdev->num_irqs;
@@ -210,6 +218,9 @@ static long vfio_platform_ioctl(void *device_data,
return ret;
+ } else if (cmd == VFIO_DEVICE_GET_DEVTREE_INFO) {
+ return vfio_platform_devtree_ioctl(vdev, arg);
+
} else if (cmd == VFIO_DEVICE_RESET)
return -EINVAL;
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 86a9201..1c42ba0 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -49,6 +49,7 @@ struct vfio_platform_device {
u32 num_regions;
struct vfio_platform_irq *irq;
u32 num_irqs;
+ struct device_node *of_node;
};
extern int vfio_platform_irq_init(struct vfio_platform_device *vdev);
@@ -59,4 +60,10 @@ extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
uint32_t flags, unsigned index, unsigned start,
unsigned count, void *data);
+/* device tree info support in devtree.c */
+extern void vfio_platform_devtree_get(struct vfio_platform_device *vdev);
+extern void vfio_platform_devtree_put(struct vfio_platform_device *vdev);
+extern bool vfio_platform_has_devtree(struct vfio_platform_device *vdev);
+extern long vfio_platform_devtree_ioctl(struct vfio_platform_device *vdev,
+ unsigned long arg);
#endif /* VFIO_PLATFORM_PRIVATE_H */
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index d381107..60f66ec 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -153,15 +153,41 @@ struct vfio_group_status {
struct vfio_device_info {
__u32 argsz;
__u32 flags;
-#define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports reset */
-#define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
-#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */
+#define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports reset */
+#define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
+#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */
+#define VFIO_DEVICE_FLAGS_DEVTREE (1 << 3) /* device tree metadata */
__u32 num_regions; /* Max region index + 1 */
__u32 num_irqs; /* Max IRQ index + 1 */
};
#define VFIO_DEVICE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 7)
/**
+ * VFIO_DEVICE_GET_DEVTREE_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 16,
+ * struct vfio_devtree_info)
+ *
+ * Retrieve information from the device's device tree, if available.
+ * Caller will initialize data[] with a single string with the requested
+ * devicetree property name, and type depending on whether a array of strings
+ * or an array of u32 values is expected. On success, data[] will be extended
+ * with the requested information, either as an array of u32, or with a list
+ * of strings sepparated by the NULL terminating character.
+ * Return: 0 on success, -errno on failure.
+ */
+struct vfio_devtree_info {
+ __u32 argsz;
+ __u32 type;
+#define VFIO_DEVTREE_PROP_NAMES 0
+#define VFIO_DEVTREE_ARR_TYPE_STRING 1
+#define VFIO_DEVTREE_ARR_TYPE_U8 2
+#define VFIO_DEVTREE_ARR_TYPE_U16 3
+#define VFIO_DEVTREE_ARR_TYPE_U32 4
+ __u32 length;
+ __u8 data[];
+};
+#define VFIO_DEVICE_GET_DEVTREE_INFO _IO(VFIO_TYPE, VFIO_BASE + 17)
+
+/**
* VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8,
* struct vfio_region_info)
*
--
1.8.3.2
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