diff options
| author | Lionel Landwerlin <lionel.g.landwerlin@intel.com> | 2019-07-09 17:42:27 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-07-09 21:26:40 +0100 |
| commit | 2a98f4e65bba2db83489aaadd3f9db26547cbd35 (patch) | |
| tree | df5f6cef74e6e1dfb8a84e784fe5f08010a2b1be /drivers/gpu/drm/i915/gt/intel_lrc.c | |
| parent | 46c5847e3d97f5afced32f7474e7daea819da7c9 (diff) | |
| download | linux-2a98f4e65bba2db83489aaadd3f9db26547cbd35.tar.bz2 | |
drm/i915: add infrastructure to hold off preemption on a request
We want to set this flag in the next commit on requests containing
perf queries so that the result of the perf query can just be a delta
of global counters, rather than doing post processing of the OA
buffer.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[ickle: add basic selftest for nopreempt]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190709164227.25859-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_lrc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_lrc.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index dec735405195..19ce8eb5e5c9 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -259,6 +259,17 @@ static int effective_prio(const struct i915_request *rq) int prio = rq_prio(rq); /* + * If this request is special and must not be interrupted at any + * cost, so be it. Note we are only checking the most recent request + * in the context and so may be masking an earlier vip request. It + * is hoped that under the conditions where nopreempt is used, this + * will not matter (i.e. all requests to that context will be + * nopreempt for as long as desired). + */ + if (i915_request_has_nopreempt(rq)) + prio = I915_PRIORITY_UNPREEMPTABLE; + + /* * On unwinding the active request, we give it a priority bump * if it has completed waiting on any semaphore. If we know that * the request has already started, we can prevent an unwanted |