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Message-Id: <1419024032-1269-2-git-send-email-a.motakis@virtualopensystems.com>
Date: Fri, 19 Dec 2014 22:20:29 +0100
From: Antonios Motakis <a.motakis@...tualopensystems.com>
To: kvmarm@...ts.cs.columbia.edu, iommu@...ts.linux-foundation.org,
alex.williamson@...hat.com
Cc: tech@...tualopensystems.com, christoffer.dall@...aro.org,
eric.auger@...aro.org,
Antonios Motakis <a.motakis@...tualopensystems.com>,
linux-kernel@...r.kernel.org (open list),
kvm@...r.kernel.org (open list:VFIO DRIVER),
linux-api@...r.kernel.org (open list:ABI/API)
Subject: [RFC PATCH v3 1/3] vfio: platform: add device properties skeleton and user API
This patch introduced the API to return device properties about
a PLATFORM device (if described by a device tree or ACPI) 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_DEV_PROPERTY.
The user needs to know the name and the data type of the property he is
accessing.
Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
---
drivers/vfio/platform/Makefile | 3 +-
drivers/vfio/platform/properties.c | 61 +++++++++++++++++++++++++++
drivers/vfio/platform/vfio_platform_common.c | 35 +++++++++++++++
drivers/vfio/platform/vfio_platform_private.h | 7 +++
include/uapi/linux/vfio.h | 26 ++++++++++++
5 files changed, 131 insertions(+), 1 deletion(-)
create mode 100644 drivers/vfio/platform/properties.c
diff --git a/drivers/vfio/platform/Makefile b/drivers/vfio/platform/Makefile
index 81de144..99f3ba1 100644
--- a/drivers/vfio/platform/Makefile
+++ b/drivers/vfio/platform/Makefile
@@ -1,5 +1,6 @@
-vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o
+vfio-platform-y := vfio_platform.o vfio_platform_common.o vfio_platform_irq.o \
+ devtree.o
obj-$(CONFIG_VFIO_PLATFORM) += vfio-platform.o
diff --git a/drivers/vfio/platform/properties.c b/drivers/vfio/platform/properties.c
new file mode 100644
index 0000000..8b90465
--- /dev/null
+++ b/drivers/vfio/platform/properties.c
@@ -0,0 +1,61 @@
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/property.h>
+#include "vfio_platform_private.h"
+
+static int dev_property_get_strings(struct device *dev,
+ char *name, unsigned *lenp,
+ void __user *datap, unsigned long datasz)
+{
+ return -EINVAL;
+}
+
+static int dev_property_get_uint(struct device *dev, char *name,
+ uint32_t type, unsigned *lenp,
+ void __user *datap, unsigned long datasz)
+{
+ return -EINVAL;
+}
+
+int vfio_platform_dev_properties(struct device *dev,
+ uint32_t type, unsigned *lenp,
+ void __user *datap, unsigned long datasz)
+{
+ char *name;
+ long namesz;
+ int ret;
+
+ namesz = strnlen_user(datap, datasz);
+ if (!namesz)
+ return -EFAULT;
+ if (namesz > datasz)
+ return -EINVAL;
+
+ name = kzalloc(namesz, GFP_KERNEL);
+ if (!name)
+ return -ENOMEM;
+ if (strncpy_from_user(name, datap, namesz) <= 0) {
+ kfree(name);
+ return -EFAULT;
+ }
+
+ switch (type) {
+ case VFIO_DEV_PROPERTY_TYPE_STRINGS:
+ ret = dev_property_get_strings(dev, name, lenp, datap, datasz);
+ break;
+
+ case VFIO_DEV_PROPERTY_TYPE_U64:
+ case VFIO_DEV_PROPERTY_TYPE_U32:
+ case VFIO_DEV_PROPERTY_TYPE_U16:
+ case VFIO_DEV_PROPERTY_TYPE_U8:
+ ret = dev_property_get_uint(dev, name, type, lenp,
+ datap, datasz);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ kfree(name);
+ return ret;
+}
diff --git a/drivers/vfio/platform/vfio_platform_common.c b/drivers/vfio/platform/vfio_platform_common.c
index a532a25..83ad4b74 100644
--- a/drivers/vfio/platform/vfio_platform_common.c
+++ b/drivers/vfio/platform/vfio_platform_common.c
@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/vfio.h>
+#include <linux/property.h>
#include "vfio_platform_private.h"
@@ -251,6 +252,34 @@ static long vfio_platform_ioctl(void *device_data,
return ret;
+ } else if (cmd == VFIO_DEVICE_GET_DEV_PROPERTY) {
+ struct vfio_dev_property info;
+ void __user *datap;
+ unsigned long datasz;
+ int ret;
+
+ if (!vdev->dev)
+ return -EINVAL;
+
+ minsz = offsetofend(struct vfio_dev_property, length);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ datap = (void __user *) arg + minsz;
+ datasz = info.argsz - minsz;
+
+ ret = vfio_platform_dev_properties(vdev->dev, info.type,
+ &info.length, datap, datasz);
+
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ ret = -EFAULT;
+
+ return ret;
+
} else if (cmd == VFIO_DEVICE_RESET)
return -EINVAL;
@@ -501,6 +530,12 @@ int vfio_platform_probe_common(struct vfio_platform_device *vdev,
return ret;
}
+ /* add device properties flag */
+ if (device_property_present(dev, "name")) {
+ vdev->dev = dev;
+ vdev->flags |= VFIO_DEVICE_FLAGS_DEV_PROPERTIES;
+ }
+
mutex_init(&vdev->igate);
return 0;
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index c3d5b4b..fc6b1fb 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -53,6 +53,7 @@ struct vfio_platform_device {
u32 num_irqs;
int refcnt;
struct mutex igate;
+ struct device *dev;
/*
* These fields should be filled by the bus specific binder
@@ -79,4 +80,10 @@ extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
unsigned start, unsigned count,
void *data);
+/* device properties support in devtree.c */
+extern int vfio_platform_dev_properties(struct device *dev,
+ uint32_t type, unsigned *lenp,
+ void __user *datap,
+ unsigned long datasz);
+
#endif /* VFIO_PLATFORM_PRIVATE_H */
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 544d3d8..ac50ab3f 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -161,12 +161,38 @@ struct vfio_device_info {
#define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */
#define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
+#define VFIO_DEVICE_FLAGS_DEV_PROPERTIES (1 << 4) /* Device properties */
__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_DEV_PROPERTY - _IOR(VFIO_TYPE, VFIO_BASE + 16,
+ * struct vfio_devtree_info)
+ *
+ * Retrive a device property, e.g. from a 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_dev_property {
+ __u32 argsz;
+ __u32 type;
+#define VFIO_DEV_PROPERTY_TYPE_STRINGS 0
+#define VFIO_DEV_PROPERTY_TYPE_U8 1
+#define VFIO_DEV_PROPERTY_TYPE_U16 2
+#define VFIO_DEV_PROPERTY_TYPE_U32 3
+#define VFIO_DEV_PROPERTY_TYPE_U64 4
+ __u32 length;
+ __u8 data[];
+};
+#define VFIO_DEVICE_GET_DEV_PROPERTY _IO(VFIO_TYPE, VFIO_BASE + 17)
+
+/**
* VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8,
* struct vfio_region_info)
*
--
2.1.3
--
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