On Thu, Sep 01, 2016 at 03:40:44PM -0700, Laura Abbott wrote:
>
> Ion clients currently lack a good method to determine what
> heaps are available and what ids they map to. This leads
> to tight coupling between user and kernel space and headaches.
> Add a query ioctl to let userspace know the availability of
> heaps.
>
> Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
> ---
> drivers/staging/android/ion/ion-ioctl.c | 11 +++++++++
> drivers/staging/android/ion/ion.c | 44 +++++++++++++++++++++++++++++++++
> drivers/staging/android/ion/ion_priv.h | 3 +++
> drivers/staging/android/uapi/ion.h | 39 +++++++++++++++++++++++++++++
> 4 files changed, 97 insertions(+)
>
> diff --git a/drivers/staging/android/ion/ion-ioctl.c b/drivers/staging/android/ion/ion-ioctl.c
> index 53b9520..e76d517 100644
> --- a/drivers/staging/android/ion/ion-ioctl.c
> +++ b/drivers/staging/android/ion/ion-ioctl.c
> @@ -28,6 +28,7 @@ union ion_ioctl_arg {
> struct ion_handle_data handle;
> struct ion_custom_data custom;
> struct ion_abi_version abi_version;
> + struct ion_heap_query query;
> };
>
> static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
> @@ -38,6 +39,11 @@ static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
> case ION_IOC_ABI_VERSION:
> ret = arg->abi_version.reserved != 0;
> break;
> + case ION_IOC_HEAP_QUERY:
> + ret = arg->query.reserved0 != 0;
> + ret |= arg->query.reserved1 != 0;
> + ret |= arg->query.reserved2 != 0;
> + break;
> default:
> break;
> }
> @@ -162,6 +168,11 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> data.abi_version.abi_version = ION_ABI_VERSION;
> break;
> }
> + case ION_IOC_HEAP_QUERY:
> + {
> + ret = ion_query_heaps(client, &data.query);
> + break;
> + }
Minor nit, the { } aren't needed here. Yeah, I know the other cases
have them, but they aren't all needed there either, no need to keep
copying bad code style :)
> default:
> return -ENOTTY;
> }
> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
> index 975b48f..91b765c 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -1174,6 +1174,49 @@ int ion_sync_for_device(struct ion_client *client, int fd)
> return 0;
> }
>
> +int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
> +{
> + struct ion_device *dev = client->dev;
> + struct ion_heap_data __user *buffer =
> + (struct ion_heap_data __user *)query->heaps;
Shouldn't query be marked as __user instead of having this cast?
> + int ret = -EINVAL, cnt = 0, max_cnt;
> + struct ion_heap *heap;
> + struct ion_heap_data hdata;
> +
> + memset(&hdata, 0, sizeof(hdata));
> +
> + down_read(&dev->lock);
> + if (!buffer) {
> + query->cnt = dev->heap_cnt;
Wait, query is __user?
I think the mixing of user/kernel pointers here isn't quite right, or I
just really can't figure it out...
And kbuild didn't seem to like this patch either :(
But your first 2 patches are great, I'll queue them up later today.
thanks,
greg k-h
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