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gpu: nvgpu: handle clk arb event posting in OS specific code

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The mechanism of posting events to userspace is OS specific.
In linux this works through poll fd, wherein we can make use
of nvgpu_cond variables to poll and trigger the corresponding
wait_queue.

The post event functionality on QNX doesn't work on poll though.
It uses iofunc_notify_trigger to post the events to the calling
process. As such QNX can't work with nvgpu_cond's.

To overcome this issue, it is proposed to create OS specific
interface function for posting clk arb events. Linux can call
nvgpu_cond based implementation, which makes sense since these
are already initialized and poll'ed in Linux specific code only.
QNX can implement this interface to call iofunc_notify_*
functions, as per its need.

Jira VQRM-3741

Change-Id: I7d9f71dae2ae7f6a09cd56662003fd1b7e50324c
Signed-off-by: Sourab Gupta <sourabg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1709656
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Sourab Gupta
2018-05-07 09:27:30 +05:30
committed by mobile promotions
parent 9352136ad3
commit 85d7b3c5cc
3 changed files with 10 additions and 2 deletions
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5
drivers/gpu/nvgpu/common/linux/ioctl_clk_arb.c
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@@ -88,6 +88,11 @@ static unsigned int nvgpu_clk_arb_poll_dev(struct file *filp, poll_table *wait)
return nvgpu_convert_poll_mask(nvgpu_atomic_xchg(&dev->poll_mask, 0));
}
void nvgpu_clk_arb_event_post_event(struct nvgpu_clk_dev *dev)
{
nvgpu_cond_broadcast_interruptible(&dev->readout_wq);
}
static int nvgpu_clk_arb_release_event_dev(struct inode *inode,
struct file *filp)
{