[ 7534.150687] BUG: KCSAN: data-race in __execlists_submission_tasklet [i915] /
process_csb [i915]
[ 7534.150706]
[ 7534.150717] write to 0xffff8881f1bc24b4 of 4 bytes by task 24404 on cpu 3:
[ 7534.150925] __execlists_submission_tasklet+0x1158/0x2780 [i915]
[ 7534.151133] execlists_submit_request+0x2e8/0x2f0 [i915]
[ 7534.151348] submit_notify+0x8f/0xc0 [i915]
[ 7534.151549] __i915_sw_fence_complete+0x5d/0x3e0 [i915]
[ 7534.151753] i915_sw_fence_complete+0x58/0x80 [i915]
[ 7534.151963] i915_sw_fence_commit+0x16/0x20 [i915]
[ 7534.152179] __i915_request_queue+0x60/0x70 [i915]
[ 7534.152388] i915_gem_do_execbuffer+0x3997/0x4c20 [i915]
[ 7534.152598] i915_gem_execbuffer2_ioctl+0x2c3/0x580 [i915]
[ 7534.152615] drm_ioctl_kernel+0xe4/0x120
[ 7534.152629] drm_ioctl+0x297/0x4c7
[ 7534.152642] ksys_ioctl+0x89/0xb0
[ 7534.152654] __x64_sys_ioctl+0x42/0x60
[ 7534.152667] do_syscall_64+0x6e/0x2c0
[ 7534.152681] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 7534.152693]
[ 7534.152703] read to 0xffff8881f1bc24b4 of 4 bytes by interrupt on cpu 2:
[ 7534.152914] process_csb+0xe7c/0x10a0 [i915]
[ 7534.153120] execlists_submission_tasklet+0x30/0x170 [i915]
[ 7534.153138] tasklet_action_common.isra.0+0x42/0xa0
[ 7534.153153] __do_softirq+0xd7/0x2cd
[ 7534.153166] run_ksoftirqd+0x15/0x20
[ 7534.153180] smpboot_thread_fn+0x1ab/0x300
[ 7534.153194] kthread+0x19a/0x1e0
[ 7534.153207] ret_from_fork+0x1f/0x30
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c
b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 3eb7adc4e057..9890d248749e 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1792,12 +1792,13 @@ timeslice(const struct intel_engine_cs *engine)
static unsigned long
active_timeslice(const struct intel_engine_cs *engine)
{
- const struct i915_request *rq = *engine->execlists.active;
+ const struct intel_engine_execlists *execlists = &engine->execlists;
+ const struct i915_request *rq = *execlists->active;
if (!rq || i915_request_completed(rq))
return 0;
- if (engine->execlists.switch_priority_hint < effective_prio(rq))
+ if (READ_ONCE(execlists->switch_priority_hint) < effective_prio(rq))
return 0;
return timeslice(engine);
@@ -1814,8 +1815,11 @@ static void set_timeslice(struct intel_engine_cs *engine)
static void start_timeslice(struct intel_engine_cs *engine)
{
struct intel_engine_execlists *execlists = &engine->execlists;
+ int prio = queue_prio(execlists);
- execlists->switch_priority_hint = execlists->queue_priority_hint;
+ WRITE_ONCE(execlists->switch_priority_hint, prio);
+ if (prio == INT_MIN)
+ return;
if (timer_pending(&execlists->timer))
return;
@@ -5342,10 +5346,10 @@ void intel_execlists_show_requests(struct
intel_engine_cs *engine,
if (execlists->switch_priority_hint != INT_MIN)
drm_printf(m, "\t\tSwitch priority hint: %d\n",
- execlists->switch_priority_hint);
+ READ_ONCE(execlists->switch_priority_hint));
if (execlists->queue_priority_hint != INT_MIN)
drm_printf(m, "\t\tQueue priority hint: %d\n",
- execlists->queue_priority_hint);
+ READ_ONCE(execlists->queue_priority_hint));
last = NULL;
count = 0;
--
2.20.1
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