linux-kernel - [PATCH v3 0/2] drm/msm: Add the MSM_WAIT

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Message-Id: <20200123235738.48182-1-brian@brkho.com>
Date:   Thu, 23 Jan 2020 18:57:36 -0500
From:   Brian Ho <brian@...ho.com>
To:     freedreno@...ts.freedesktop.org
Cc:     hoegsberg@...omium.org, robdclark@...omium.org,
        Brian Ho <brian@...ho.com>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU),
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 0/2] drm/msm: Add the MSM_WAIT_IOVA ioctl

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(-)

-- 
2.25.0.341.g760bfbb309-goog