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drm/i915/gt: Lift set-wedged engine dumping out of user paths 

The user (e.g. gem_eio) can manipulate the driver into wedging itself,
allowing the user to trigger voluminous logging of inconsequential
details. If we lift the dump to direct calls to intel_gt_set_wedged(),
out of the intel_reset failure handling, we keep the detail logging for
what we expect are true HW or test failures without being tricked.

Reported-by: Tomi Sarvela <tomi.p.sarvela@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tomi Sarvela <tomi.p.sarvela@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200127231540.3302516-6-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-01-27 23:15:40 +00:00
parent ff3d4ff6c9
commit a28477826a
1 changed files with 22 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/gpu/drm/i915/gt/intel_reset.c
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@ -800,13 +800,6 @@ static void __intel_gt_set_wedged(struct intel_gt *gt)
if (test_bit(I915_WEDGED, &gt->reset.flags))
return;
if (GEM_SHOW_DEBUG() && !intel_engines_are_idle(gt)) {
struct drm_printer p = drm_debug_printer(__func__);
for_each_engine(engine, gt, id)
intel_engine_dump(engine, &p, "%s\n", engine->name);
}
GT_TRACE(gt, "start\n");
/*
@ -845,10 +838,30 @@ void intel_gt_set_wedged(struct intel_gt *gt)
{
intel_wakeref_t wakeref;
if (test_bit(I915_WEDGED, &gt->reset.flags))
return;
wakeref = intel_runtime_pm_get(gt->uncore->rpm);
mutex_lock(&gt->reset.mutex);
with_intel_runtime_pm(gt->uncore->rpm, wakeref)
__intel_gt_set_wedged(gt);
if (GEM_SHOW_DEBUG()) {
struct drm_printer p = drm_debug_printer(__func__);
struct intel_engine_cs *engine;
enum intel_engine_id id;
drm_printf(&p, "called from %pS\n", (void *)_RET_IP_);
for_each_engine(engine, gt, id) {
if (intel_engine_is_idle(engine))
continue;
intel_engine_dump(engine, &p, "%s\n", engine->name);
}
}
__intel_gt_set_wedged(gt);
mutex_unlock(&gt->reset.mutex);
intel_runtime_pm_put(gt->uncore->rpm, wakeref);
}
static bool __intel_gt_unset_wedged(struct intel_gt *gt)