drm/i915/gt: Avoid resetting ring->head outside of its timeline mutex

We manipulate ring->head while active in i915_request_retire underneath
the timeline manipulation. We cannot rely on a stable ring->head outside
of the timeline->mutex, in particular while setting up the context for
resume and reset.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/1126
Fixes: 0881954965e3 ("drm/i915: Introduce intel_context.pin_mutex for pin management")
Fixes: e5dadff4b093 ("drm/i915: Protect request retirement with timeline->mutex")
References: f3c0efc9fe7a ("drm/i915/execlists: Leave resetting ring to intel_ring")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200211120131.958949-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 929be03..70d91ad 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -235,7 +235,8 @@ static void execlists_init_reg_state(u32 *reg_state,
                                     bool close);
 static void
 __execlists_update_reg_state(const struct intel_context *ce,
-                            const struct intel_engine_cs *engine);
+                            const struct intel_engine_cs *engine,
+                            u32 head);
 
 static void mark_eio(struct i915_request *rq)
 {
@@ -1184,12 +1185,11 @@ static void reset_active(struct i915_request *rq,
                head = rq->tail;
        else
                head = active_request(ce->timeline, rq)->head;
-       ce->ring->head = intel_ring_wrap(ce->ring, head);
-       intel_ring_update_space(ce->ring);
+       head = intel_ring_wrap(ce->ring, head);
 
        /* Scrub the context image to prevent replaying the previous batch */
        restore_default_state(ce, engine);
-       __execlists_update_reg_state(ce, engine);
+       __execlists_update_reg_state(ce, engine, head);
 
        /* We've switched away, so this should be a no-op, but intent matters */
        ce->lrc_desc |= CTX_DESC_FORCE_RESTORE;
@@ -2878,16 +2878,17 @@ static void execlists_context_unpin(struct intel_context *ce)
 
 static void
 __execlists_update_reg_state(const struct intel_context *ce,
-                            const struct intel_engine_cs *engine)
+                            const struct intel_engine_cs *engine,
+                            u32 head)
 {
        struct intel_ring *ring = ce->ring;
        u32 *regs = ce->lrc_reg_state;
 
-       GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->head));
+       GEM_BUG_ON(!intel_ring_offset_valid(ring, head));
        GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->tail));
 
        regs[CTX_RING_START] = i915_ggtt_offset(ring->vma);
-       regs[CTX_RING_HEAD] = ring->head;
+       regs[CTX_RING_HEAD] = head;
        regs[CTX_RING_TAIL] = ring->tail;
 
        /* RPCS */
@@ -2916,7 +2917,7 @@ __execlists_context_pin(struct intel_context *ce,
 
        ce->lrc_desc = lrc_descriptor(ce, engine) | CTX_DESC_FORCE_RESTORE;
        ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
-       __execlists_update_reg_state(ce, engine);
+       __execlists_update_reg_state(ce, engine, ce->ring->tail);
 
        return 0;
 }
@@ -2941,7 +2942,7 @@ static void execlists_context_reset(struct intel_context *ce)
        /* Scrub away the garbage */
        execlists_init_reg_state(ce->lrc_reg_state,
                                 ce, ce->engine, ce->ring, true);
-       __execlists_update_reg_state(ce, ce->engine);
+       __execlists_update_reg_state(ce, ce->engine, ce->ring->tail);
 
        ce->lrc_desc |= CTX_DESC_FORCE_RESTORE;
 }
@@ -3538,6 +3539,7 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled)
        struct intel_engine_execlists * const execlists = &engine->execlists;
        struct intel_context *ce;
        struct i915_request *rq;
+       u32 head;
 
        mb(); /* paranoia: read the CSB pointers from after the reset */
        clflush(execlists->csb_write);
@@ -3565,15 +3567,15 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled)
 
        if (i915_request_completed(rq)) {
                /* Idle context; tidy up the ring so we can restart afresh */
-               ce->ring->head = intel_ring_wrap(ce->ring, rq->tail);
+               head = intel_ring_wrap(ce->ring, rq->tail);
                goto out_replay;
        }
 
        /* Context has requests still in-flight; it should not be idle! */
        GEM_BUG_ON(i915_active_is_idle(&ce->active));
        rq = active_request(ce->timeline, rq);
-       ce->ring->head = intel_ring_wrap(ce->ring, rq->head);
-       GEM_BUG_ON(ce->ring->head == ce->ring->tail);
+       head = intel_ring_wrap(ce->ring, rq->head);
+       GEM_BUG_ON(head == ce->ring->tail);
 
        /*
         * If this request hasn't started yet, e.g. it is waiting on a
@@ -3618,10 +3620,9 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled)
 
 out_replay:
        ENGINE_TRACE(engine, "replay {head:%04x, tail:%04x}\n",
-                    ce->ring->head, ce->ring->tail);
-       intel_ring_update_space(ce->ring);
+                    head, ce->ring->tail);
        __execlists_reset_reg_state(ce, engine);
-       __execlists_update_reg_state(ce, engine);
+       __execlists_update_reg_state(ce, engine, head);
        ce->lrc_desc |= CTX_DESC_FORCE_RESTORE; /* paranoid: GPU was reset! */
 
 unwind:
@@ -5265,10 +5266,7 @@ void intel_lr_context_reset(struct intel_engine_cs *engine,
                restore_default_state(ce, engine);
 
        /* Rerun the request; its payload has been neutered (if guilty). */
-       ce->ring->head = head;
-       intel_ring_update_space(ce->ring);
-
-       __execlists_update_reg_state(ce, engine);
+       __execlists_update_reg_state(ce, engine, head);
 }
 
 bool

diff --git a/drivers/gpu/drm/i915/gt/intel_ring_types.h b/drivers/gpu/drm/i915/gt/intel_ring_types.h
index 3cd7fec..1a189ea 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_ring_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_ring_types.h
@@ -39,9 +39,9 @@ struct intel_ring {
         */
        atomic_t pin_count;
 
-       u32 head;
-       u32 tail;
-       u32 emit;
+       u32 head; /* updated during retire, loosely tracks RING_HEAD */
+       u32 tail; /* updated on submission, used for RING_TAIL */
+       u32 emit; /* updated during request construction */
 
        u32 space;
        u32 size;

diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 7ef6850..82fa071 100644 (file)
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -201,7 +201,7 @@ static int live_unlite_restore(struct intel_gt *gt, int prio)
                }
                GEM_BUG_ON(!ce[1]->ring->size);
                intel_ring_reset(ce[1]->ring, ce[1]->ring->size / 2);
-               __execlists_update_reg_state(ce[1], engine);
+               __execlists_update_reg_state(ce[1], engine, ce[1]->ring->head);
 
                rq[0] = igt_spinner_create_request(&spin, ce[0], MI_ARB_CHECK);
                if (IS_ERR(rq[0])) {