1. 16 Oct, 2019 11 commits
  2. 15 Oct, 2019 28 commits
  3. 14 Oct, 2019 1 commit
    • Lionel Landwerlin's avatar
      drm/i915/perf: allow holding preemption on filtered ctx · 9cd20ef7
      Lionel Landwerlin authored
      We would like to make use of perf in Vulkan. The Vulkan API is much
      lower level than OpenGL, with applications directly exposed to the
      concept of command buffers (pretty much equivalent to our batch
      buffers). In Vulkan, queries are always limited in scope to a command
      buffer. In OpenGL, the lack of command buffer concept meant that
      queries' duration could span multiple command buffers.
      
      With that restriction gone in Vulkan, we would like to simplify
      measuring performance just by measuring the deltas between the counter
      snapshots written by 2 MI_RECORD_PERF_COUNT commands, rather than the
      more complex scheme we currently have in the GL driver, using 2
      MI_RECORD_PERF_COUNT commands and doing some post processing on the
      stream of OA reports, coming from the global OA buffer, to remove any
      unrelated deltas in between the 2 MI_RECORD_PERF_COUNT.
      
      Disabling preemption only apply to a single context with which want to
      query performance counters for and is considered a privileged
      operation, by default protected by CAP_SYS_ADMIN. It is possible to
      enable it for a normal user by disabling the paranoid stream setting.
      
      v2: Store preemption setting in intel_context (Chris)
      
      v3: Use priorities to avoid preemption rather than the HW mechanism
      
      v4: Just modify the port priority reporting function
      
      v5: Add nopreempt flag on gem context and always flag requests
          appropriately, regarless of OA reconfiguration.
      
      Link: https://gitlab.freedesktop.org/mesa/mesa/merge_requests/932Signed-off-by: default avatarLionel Landwerlin <lionel.g.landwerlin@intel.com>
      Reviewed-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
      Link: https://patchwork.freedesktop.org/patch/msgid/20191014201404.22468-4-chris@chris-wilson.co.uk
      9cd20ef7