gpu: nvgpu: add channel event id support

With NVGPU_IOCTL_CHANNEL_EVENTS_CTRL, nvgpu can
raise events to User space. But user space
cannot distinguish between various types of events.
To overcome this, we need finer-grained API to
deliver various events to user space.

Remove old API NVGPU_IOCTL_CHANNEL_EVENTS_CTRL,
and all the support for this API (we can remove
this since User space has not started using this
API at all)

Add new API NVGPU_IOCTL_CHANNEL_EVENT_ID_CTRL
which will accept an event_id (like BPT.INT or
BPT.PAUSE), a command to enable the event,
and return a file descriptor on which
we can raise the event (if cmd=enable)
Event is disabled when file descriptor is closed

Add file operations "gk20a_event_id_ops"
to support polling on event fd

Also add API gk20a_channel_get_event_data_from_id()
to get event_data of event from its id

Bug 200089620

Change-Id: I5288f19f38ff49448c46338c33b2a927c9e02254
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1030775
(cherry picked from commit 5721ce2735950440bedc2b86f851db08ed593275)
Reviewed-on: http://git-master/r/1120318
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/gr_vgpu.c b/drivers/gpu/nvgpu/vgpu/gr_vgpu.c
index f83f35b8..3baa420f 100644
--- a/drivers/gpu/nvgpu/vgpu/gr_vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/gr_vgpu.c
@@ -871,7 +871,7 @@ int vgpu_gr_isr(struct gk20a *g, struct tegra_vgpu_gr_intr_info *info)
                 wake_up(&ch->notifier_wq);
                 break;
         case TEGRA_VGPU_GR_INTR_SEMAPHORE:
-                gk20a_channel_post_event(ch);
+                wake_up_interruptible_all(&ch->semaphore_wq);
                 break;
         case TEGRA_VGPU_GR_INTR_SEMAPHORE_TIMEOUT:
                 gk20a_set_error_notifier(ch,