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SubjectRe: [RFC PATCH v4 3/3] vfio: platform: return device properties as arrays of unsigned integers
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On Wed, 2015-09-09 at 11:17 +0200, Baptiste Reynal wrote:
> 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;

Why is this conditional?

> +
> + if (n * sz > datasz)
> + return -EOVERFLOW;

Ugh, this isn't E2BIG or ENOSPC...

> +
> + 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,





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