From: Chris Wilson chris@chris-wilson.co.uk
Due to a change in requirements that disallows tasklet_disable() being called from atomic context, rearrange the selftest to avoid doing so.
<3> [324.942939] BUG: sleeping function called from invalid context at kernel/softirq.c:888 <3> [324.942952] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5601, name: i915_selftest <4> [324.942960] 1 lock held by i915_selftest/5601: <4> [324.942963] #0: ffff888101d19240 (&dev->mutex){....}-{3:3}, at: device_driver_attach+0x18/0x50 <3> [324.942987] Preemption disabled at: <3> [324.942990] [<ffffffffa026fbd2>] live_hold_reset.part.65+0xc2/0x2f0 [i915] <4> [324.943255] CPU: 0 PID: 5601 Comm: i915_selftest Tainted: G U 5.13.0-rc5-CI-CI_DRM_10197+ #1 <4> [324.943259] Hardware name: Intel Corp. Geminilake/GLK RVP2 LP4SD (07), BIOS GELKRVPA.X64.0062.B30.1708222146 08/22/2017 <4> [324.943263] Call Trace: <4> [324.943267] dump_stack+0x7f/0xad <4> [324.943276] ___might_sleep.cold.123+0xf2/0x106 <4> [324.943286] tasklet_unlock_wait+0x2e/0xb0 <4> [324.943291] ? ktime_get_raw+0x81/0x120 <4> [324.943305] live_hold_reset.part.65+0x1ab/0x2f0 [i915] <4> [324.943500] __i915_subtests.cold.7+0x42/0x92 [i915] <4> [324.943723] ? __i915_live_teardown+0x50/0x50 [i915] <4> [324.943922] ? __intel_gt_live_setup+0x30/0x30 [i915]
Fixes: da044747401fc ("tasklets: Replace spin wait in tasklet_unlock_wait()") Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Reviewed-by: Thomas Hellström thomas.hellstrom@linux.intel.com --- drivers/gpu/drm/i915/gt/selftest_execlists.c | 55 ++++++++++++-------- 1 file changed, 32 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c index ea2203af0764..1c8108d30b85 100644 --- a/drivers/gpu/drm/i915/gt/selftest_execlists.c +++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c @@ -551,6 +551,32 @@ static int live_pin_rewind(void *arg) return err; }
+static int engine_lock_reset_tasklet(struct intel_engine_cs *engine) +{ + tasklet_disable(&engine->execlists.tasklet); + local_bh_disable(); + + if (test_and_set_bit(I915_RESET_ENGINE + engine->id, + &engine->gt->reset.flags)) { + local_bh_enable(); + tasklet_enable(&engine->execlists.tasklet); + + intel_gt_set_wedged(engine->gt); + return -EBUSY; + } + + return 0; +} + +static void engine_unlock_reset_tasklet(struct intel_engine_cs *engine) +{ + clear_and_wake_up_bit(I915_RESET_ENGINE + engine->id, + &engine->gt->reset.flags); + + local_bh_enable(); + tasklet_enable(&engine->execlists.tasklet); +} + static int live_hold_reset(void *arg) { struct intel_gt *gt = arg; @@ -598,15 +624,9 @@ static int live_hold_reset(void *arg)
/* We have our request executing, now remove it and reset */
- local_bh_disable(); - if (test_and_set_bit(I915_RESET_ENGINE + id, - >->reset.flags)) { - local_bh_enable(); - intel_gt_set_wedged(gt); - err = -EBUSY; + err = engine_lock_reset_tasklet(engine); + if (err) goto out; - } - tasklet_disable(&engine->execlists.tasklet);
engine->execlists.tasklet.callback(&engine->execlists.tasklet); GEM_BUG_ON(execlists_active(&engine->execlists) != rq); @@ -618,10 +638,7 @@ static int live_hold_reset(void *arg) __intel_engine_reset_bh(engine, NULL); GEM_BUG_ON(rq->fence.error != -EIO);
- tasklet_enable(&engine->execlists.tasklet); - clear_and_wake_up_bit(I915_RESET_ENGINE + id, - >->reset.flags); - local_bh_enable(); + engine_unlock_reset_tasklet(engine);
/* Check that we do not resubmit the held request */ if (!i915_request_wait(rq, 0, HZ / 5)) { @@ -4585,15 +4602,9 @@ static int reset_virtual_engine(struct intel_gt *gt, GEM_BUG_ON(engine == ve->engine);
/* Take ownership of the reset and tasklet */ - local_bh_disable(); - if (test_and_set_bit(I915_RESET_ENGINE + engine->id, - >->reset.flags)) { - local_bh_enable(); - intel_gt_set_wedged(gt); - err = -EBUSY; + err = engine_lock_reset_tasklet(engine); + if (err) goto out_heartbeat; - } - tasklet_disable(&engine->execlists.tasklet);
engine->execlists.tasklet.callback(&engine->execlists.tasklet); GEM_BUG_ON(execlists_active(&engine->execlists) != rq); @@ -4612,9 +4623,7 @@ static int reset_virtual_engine(struct intel_gt *gt, GEM_BUG_ON(rq->fence.error != -EIO);
/* Release our grasp on the engine, letting CS flow again */ - tasklet_enable(&engine->execlists.tasklet); - clear_and_wake_up_bit(I915_RESET_ENGINE + engine->id, >->reset.flags); - local_bh_enable(); + engine_unlock_reset_tasklet(engine);
/* Check that we do not resubmit the held request */ i915_request_get(rq);