We already assign a unique identifier to every request: seqno. That
someone felt like adding a second one without even mentioning why and
tweaking ABI smells very fishy.
Fixes regression from
commit b3a38998f042b862f5ba4d7f2268f3a8dfb4883a
Author: Nick Hoath <nicholas.hoath@xxxxxxxxx>
Date: Thu Feb 19 16:30:47 2015 +0000
drm/i915: Fix a use after free, and unbalanced refcounting
v2: Rebase
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Nick Hoath <nicholas.hoath@xxxxxxxxx>
Cc: Thomas Daniel <thomas.daniel@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 4 ----
drivers/gpu/drm/i915/i915_gem.c | 1 -
drivers/gpu/drm/i915/i915_trace.h | 13 ++++---------
3 files changed, 4 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 262ebb620112..89839751237c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1843,8 +1843,6 @@ struct drm_i915_private {
void (*stop_ring)(struct intel_engine_cs *ring);
} gt;
- uint32_t request_uniq;
-
/*
* NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
* will be rejected. Instead look for a better place.
@@ -2120,8 +2118,6 @@ struct drm_i915_gem_request {
/** process identifier submitting this request */
struct pid *pid;
- uint32_t uniq;
-
/**
* The ELSP only accepts two elements at a time, so we queue
* context/tail pairs on a given queue (ring->execlist_queue) until the
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c394c0d13eb7..e90894545fa4 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2660,7 +2660,6 @@ int i915_gem_request_alloc(struct intel_engine_cs *ring,
}
rq->ring = ring;
- rq->uniq = dev_priv->request_uniq++;
if (i915.enable_execlists)
ret = intel_logical_ring_alloc_request_extras(rq, ctx);
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index ce8ee9e8bced..6e2eee52aaa2 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -499,7 +499,6 @@ DECLARE_EVENT_CLASS(i915_gem_request,
TP_STRUCT__entry(
__field(u32, dev)
__field(u32, ring)
- __field(u32, uniq)
__field(u32, seqno)
),
@@ -508,13 +507,11 @@ DECLARE_EVENT_CLASS(i915_gem_request,
i915_gem_request_get_ring(req);
__entry->dev = ring->dev->primary->index;
__entry->ring = ring->id;
- __entry->uniq = req ? req->uniq : 0;
__entry->seqno = i915_gem_request_get_seqno(req);
),
- TP_printk("dev=%u, ring=%u, uniq=%u, seqno=%u",
- __entry->dev, __entry->ring, __entry->uniq,
- __entry->seqno)
+ TP_printk("dev=%u, ring=%u, seqno=%u",
+ __entry->dev, __entry->ring, __entry->seqno)
);
DEFINE_EVENT(i915_gem_request, i915_gem_request_add,
@@ -559,7 +556,6 @@ TRACE_EVENT(i915_gem_request_wait_begin,
TP_STRUCT__entry(
__field(u32, dev)
__field(u32, ring)
- __field(u32, uniq)
__field(u32, seqno)
__field(bool, blocking)
),
@@ -575,14 +571,13 @@ TRACE_EVENT(i915_gem_request_wait_begin,
i915_gem_request_get_ring(req);
__entry->dev = ring->dev->primary->index;
__entry->ring = ring->id;
- __entry->uniq = req ? req->uniq : 0;
__entry->seqno = i915_gem_request_get_seqno(req);
__entry->blocking =
mutex_is_locked(&ring->dev->struct_mutex);
),
- TP_printk("dev=%u, ring=%u, uniq=%u, seqno=%u, blocking=%s",
- __entry->dev, __entry->ring, __entry->uniq,
+ TP_printk("dev=%u, ring=%u, seqno=%u, blocking=%s",
+ __entry->dev, __entry->ring,
__entry->seqno, __entry->blocking ? "yes (NB)" : "no")
);
--
2.1.4
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