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

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

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211214170500.28569-7-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2021-12-14 09:04:59 -08:00 committed by John Harrison
parent 6e94d53962
commit 2aa9f833dd
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
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@ -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