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Subject[RFC PATCH v4 3/3] vfio: platform: return device properties as arrays of unsigned integers
Date
From: Antonios Motakis <a.motakis@virtualopensystems.com>

Certain properties of a device are accessible as an array of unsigned
integers, either u64, u32, u16, or u8. Let the VFIO user query this
type of device properties.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Baptiste Reynal <b.reynal@virtualopensystems.com>
---
drivers/vfio/platform/properties.c | 62 +++++++++++++++++++++++++++++++++++++-
1 file changed, 61 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/platform/properties.c b/drivers/vfio/platform/properties.c
index 8bf9c8f..625e2d3 100644
--- a/drivers/vfio/platform/properties.c
+++ b/drivers/vfio/platform/properties.c
@@ -70,7 +70,67 @@ static int dev_property_get_uint(struct device *dev, uint32_t *flags,
char *name, uint32_t type, unsigned *lenp,
void __user *datap, unsigned long datasz)
{
- return -EINVAL;
+ int ret, n;
+ u8 *out;
+ size_t sz;
+ int (*func)(const struct device *, const char *, void *, size_t)
+ = NULL;
+
+ switch (type) {
+ case VFIO_DEV_PROPERTY_TYPE_U64:
+ sz = sizeof(u64);
+ func = (int (*)(const struct device *,
+ const char *, void *, size_t))
+ device_property_read_u64_array;
+ break;
+ case VFIO_DEV_PROPERTY_TYPE_U32:
+ sz = sizeof(u32);
+ func = (int (*)(const struct device *,
+ const char *, void *, size_t))
+ device_property_read_u32_array;
+ break;
+ case VFIO_DEV_PROPERTY_TYPE_U16:
+ sz = sizeof(u16);
+ func = (int (*)(const struct device *,
+ const char *, void *, size_t))
+ device_property_read_u16_array;
+ break;
+ case VFIO_DEV_PROPERTY_TYPE_U8:
+ sz = sizeof(u8);
+ func = (int (*)(const struct device *,
+ const char *, void *, size_t))
+ device_property_read_u8_array;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ /* get size of array */
+ n = func(dev, name, NULL, 0);
+ if (n < 0)
+ return n;
+
+ if (lenp)
+ *lenp = n * sz;
+
+ if (n * sz > datasz)
+ return -EOVERFLOW;
+
+ out = kcalloc(n, sz, GFP_KERNEL);
+ if (!out)
+ return -ENOMEM;
+
+ ret = func(dev, name, out, n);
+ if (ret)
+ goto out;
+
+ if (copy_to_user(datap, out, n * sz))
+ ret = -EFAULT;
+
+out:
+ kfree(out);
+ return ret;
}

int vfio_platform_dev_properties(struct device *dev, uint32_t *flags,
--
2.5.1


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