On 10/11/2013 12:43 PM, Thierry Reding wrote:
* PGP Signed by an unknown key On Wed, Oct 09, 2013 at 02:54:09PM +0300, Arto Merilainen wrote:This patch makes the necessary additions to deliver syncpoint base to the user space. This patch splits the index field in the drm_tegra_get_syncpt structure into three separate fields (index, support_base, base_id). This allows to keep compatibility over kernel versions: - The placing of index field stays constant and therefore the interface should stay compatible with earlier userspace versions. - The old index field was input-only and it was not supposed to be read afterwards. Delivering data back in the same field should not introduce regressions to any old user space applications. - Old kernels left support_base and base_id fields intact (zero) and hence the new user space applications get the correct response from the kernel (=syncpoint does not have a base). Signed-off-by: Arto Merilainen <amerilainen@xxxxxxxxxx> --- drivers/gpu/host1x/drm/drm.c | 2 ++ include/uapi/drm/tegra_drm.h | 4 +++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/host1x/drm/drm.c b/drivers/gpu/host1x/drm/drm.c index 8c61cee..4251563 100644 --- a/drivers/gpu/host1x/drm/drm.c +++ b/drivers/gpu/host1x/drm/drm.c @@ -468,6 +468,8 @@ static int tegra_get_syncpt(struct drm_device *drm, void *data, syncpt = context->client->syncpts[args->index]; args->id = host1x_syncpt_id(syncpt); + args->support_base = syncpt->base ? 1 : 0; + args->base_id = syncpt->base ? syncpt->base->id : 0; return 0; } diff --git a/include/uapi/drm/tegra_drm.h b/include/uapi/drm/tegra_drm.h index 73bde4e..7a79ca5 100644 --- a/include/uapi/drm/tegra_drm.h +++ b/include/uapi/drm/tegra_drm.h @@ -61,7 +61,9 @@ struct drm_tegra_close_channel { struct drm_tegra_get_syncpt { __u64 context; - __u32 index; + __u16 index; + __u8 support_base; + __u8 base_id; __u32 id;I don't like this. Can't we just add a separate IOCTL? Something like:
Sure. This felt like a good idea, but I must admit I had a bit mixed feelings after looking my own explanation why this would be ok...
- Arto -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
