Commit 2aa9f833 authored by Matthew Brost's avatar Matthew Brost Committed by John Harrison
Browse files

drm/i915/guc: Kick G2H tasklet if no credits 



Let's be paranoid and kick the G2H tasklet, which dequeues messages, if
G2H credits are exhausted.

Signed-off-by: default avatarMatthew Brost <matthew.brost@intel.com>
Reviewed-by: default avatarJohn Harrison <John.C.Harrison@Intel.com>
Signed-off-by: default avatarJohn Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211214170500.28569-7-matthew.brost@intel.com
parent 6e94d539

drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c

+8 −1
Original line number Diff line number Diff line
@@ -591,12 +591,19 @@ static inline bool h2g_has_room(struct intel_guc_ct *ct, u32 len_dw) 


static int has_room_nb(struct intel_guc_ct *ct, u32 h2g_dw, u32 g2h_dw)

{

	bool h2g = h2g_has_room(ct, h2g_dw);

	bool g2h = g2h_has_room(ct, g2h_dw);



	lockdep_assert_held(&ct->ctbs.send.lock);



	if (unlikely(!h2g_has_room(ct, h2g_dw) || !g2h_has_room(ct, g2h_dw))) {

	if (unlikely(!h2g || !g2h)) {

		if (ct->stall_time == KTIME_MAX)

			ct->stall_time = ktime_get();



		/* Be paranoid and kick G2H tasklet to free credits */

		if (!g2h)

			tasklet_hi_schedule(&ct->receive_tasklet);



		if (unlikely(ct_deadlocked(ct)))

			return -EPIPE;

		else