[PATCH v3 0/2] drm/msm: Add the MSM_WAIT_IOVA ioctl

[Brian Ho <brian@brkho.com>]

This patch set implements the MSM_WAIT_IOVA ioctl which lets
userspace sleep until the value at a given iova reaches a certain
condition. This is needed in turnip to implement the
VK_QUERY_RESULT_WAIT_BIT flag for vkGetQueryPoolResults.

First, we add a GPU-wide wait queue that is signaled on all IRQs.
We can then wait on this wait queue inside MSM_WAIT_IOVA until the
condition is met.

The corresponding merge request in mesa can be found at:
https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3279

Changes in v2:
    * Updated cleanup logic on error
    * Added a mask
    * 32 bit values by default

Changes in v3:
    * Fixed a bug where the mask was being applied incorrectly

Brian Ho (2):
  drm/msm: Add a GPU-wide wait queue
  drm/msm: Add MSM_WAIT_IOVA ioctl

 drivers/gpu/drm/msm/msm_drv.c | 61 +++++++++++++++++++++++++++++++++--
 drivers/gpu/drm/msm/msm_gpu.c |  4 +++
 drivers/gpu/drm/msm/msm_gpu.h |  3 ++
 include/uapi/drm/msm_drm.h    | 14 ++++++++
 4 files changed, 80 insertions(+), 2 deletions(-)

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2.25.0.341.g760bfbb309-goog