drm/i915/guc: Initialize GuC submission locks and queues early

Move initialization of submission-related spinlock, lists and workers to
init_early. This fixes an issue where if the GuC init fails we might
still try to get the lock in the context cleanup code. Note that it is
safe to call the GuC context cleanup code even if the init failed
because all contexts are initialized with an invalid GuC ID, which will
cause the GuC side of the cleanup to be skipped, so it is easier to just
make sure the variables are initialized than to special case the cleanup
to handle the case when they're not.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/4932
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220215011123.734572-1-daniele.ceraolospurio@intel.com

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 25cac44..b0de911 100644 (file)
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1818,24 +1818,11 @@ int intel_guc_submission_init(struct intel_guc *guc)
         */
        GEM_BUG_ON(!guc->lrc_desc_pool);
 
-       xa_init_flags(&guc->context_lookup, XA_FLAGS_LOCK_IRQ);
-
-       spin_lock_init(&guc->submission_state.lock);
-       INIT_LIST_HEAD(&guc->submission_state.guc_id_list);
-       ida_init(&guc->submission_state.guc_ids);
-       INIT_LIST_HEAD(&guc->submission_state.destroyed_contexts);
-       INIT_WORK(&guc->submission_state.destroyed_worker,
-                 destroyed_worker_func);
-       INIT_WORK(&guc->submission_state.reset_fail_worker,
-                 reset_fail_worker_func);
-
        guc->submission_state.guc_ids_bitmap =
                bitmap_zalloc(NUMBER_MULTI_LRC_GUC_ID(guc), GFP_KERNEL);
        if (!guc->submission_state.guc_ids_bitmap)
                return -ENOMEM;
 
-       spin_lock_init(&guc->timestamp.lock);
-       INIT_DELAYED_WORK(&guc->timestamp.work, guc_timestamp_ping);
        guc->timestamp.ping_delay = (POLL_TIME_CLKS / gt->clock_frequency + 1) * HZ;
        guc->timestamp.shift = gpm_timestamp_shift(gt);
 
@@ -3831,6 +3818,20 @@ static bool __guc_submission_selected(struct intel_guc *guc)
 
 void intel_guc_submission_init_early(struct intel_guc *guc)
 {
+       xa_init_flags(&guc->context_lookup, XA_FLAGS_LOCK_IRQ);
+
+       spin_lock_init(&guc->submission_state.lock);
+       INIT_LIST_HEAD(&guc->submission_state.guc_id_list);
+       ida_init(&guc->submission_state.guc_ids);
+       INIT_LIST_HEAD(&guc->submission_state.destroyed_contexts);
+       INIT_WORK(&guc->submission_state.destroyed_worker,
+                 destroyed_worker_func);
+       INIT_WORK(&guc->submission_state.reset_fail_worker,
+                 reset_fail_worker_func);
+
+       spin_lock_init(&guc->timestamp.lock);
+       INIT_DELAYED_WORK(&guc->timestamp.work, guc_timestamp_ping);
+
        guc->submission_state.num_guc_ids = GUC_MAX_LRC_DESCRIPTORS;
        guc->submission_supported = __guc_submission_supported(guc);
        guc->submission_selected = __guc_submission_selected(guc);