[PATCH 26/26] drm/i915: Replace global_seqno with a hangcheck heartbeat seqno
Chris Wilson
chris at chris-wilson.co.uk
Sat Jan 26 00:54:32 UTC 2019
To determine whether an engine has 'struck', we simply check whether or
not is still on the same seqno for several seconds. To keep this simple
mechanism intact over the loss of a global seqno, we can simply add a
new global heartbeat seqno instead. As we cannot know the sequence in
which requests will then be completed, we use a primitive random number
generator instead (with a cycle long enough to not matter over an
interval of a few thousand requests between hangcheck samples).
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 7 ++++---
drivers/gpu/drm/i915/intel_engine_cs.c | 5 +++--
drivers/gpu/drm/i915/intel_hangcheck.c | 6 +++---
drivers/gpu/drm/i915/intel_lrc.c | 15 +++++++++++++++
drivers/gpu/drm/i915/intel_ringbuffer.c | 20 ++++++++++++++++++--
drivers/gpu/drm/i915/intel_ringbuffer.h | 19 ++++++++++++++++++-
6 files changed, 61 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index fb216ce8dd60..429c5ac33c61 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1298,7 +1298,7 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
with_intel_runtime_pm(dev_priv, wakeref) {
for_each_engine(engine, dev_priv, id) {
acthd[id] = intel_engine_get_active_head(engine);
- seqno[id] = intel_engine_get_seqno(engine);
+ seqno[id] = intel_engine_get_hangcheck_seqno(engine);
}
intel_engine_get_instdone(dev_priv->engine[RCS], &instdone);
@@ -1318,8 +1318,9 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
for_each_engine(engine, dev_priv, id) {
seq_printf(m, "%s:\n", engine->name);
seq_printf(m, "\tseqno = %x [current %x, last %x], %dms ago\n",
- engine->hangcheck.seqno, seqno[id],
- intel_engine_last_submit(engine),
+ engine->hangcheck.last_seqno,
+ seqno[id],
+ engine->hangcheck.next_seqno,
jiffies_to_msecs(jiffies -
engine->hangcheck.action_timestamp));
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index ee43c98227bb..fbbee6dd84a8 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1498,10 +1498,11 @@ void intel_engine_dump(struct intel_engine_cs *engine,
if (i915_terminally_wedged(&engine->i915->gpu_error))
drm_printf(m, "*** WEDGED ***\n");
- drm_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms]\n",
+ drm_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x/%x [%d ms]\n",
intel_engine_get_seqno(engine),
intel_engine_last_submit(engine),
- engine->hangcheck.seqno,
+ engine->hangcheck.last_seqno,
+ engine->hangcheck.next_seqno,
jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp));
drm_printf(m, "\tReset count: %d (global %d)\n",
i915_reset_engine_count(error, engine),
diff --git a/drivers/gpu/drm/i915/intel_hangcheck.c b/drivers/gpu/drm/i915/intel_hangcheck.c
index a219c796e56d..e04b2560369e 100644
--- a/drivers/gpu/drm/i915/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/intel_hangcheck.c
@@ -133,21 +133,21 @@ static void hangcheck_load_sample(struct intel_engine_cs *engine,
struct hangcheck *hc)
{
hc->acthd = intel_engine_get_active_head(engine);
- hc->seqno = intel_engine_get_seqno(engine);
+ hc->seqno = intel_engine_get_hangcheck_seqno(engine);
}
static void hangcheck_store_sample(struct intel_engine_cs *engine,
const struct hangcheck *hc)
{
engine->hangcheck.acthd = hc->acthd;
- engine->hangcheck.seqno = hc->seqno;
+ engine->hangcheck.last_seqno = hc->seqno;
}
static enum intel_engine_hangcheck_action
hangcheck_get_action(struct intel_engine_cs *engine,
const struct hangcheck *hc)
{
- if (engine->hangcheck.seqno != hc->seqno)
+ if (engine->hangcheck.last_seqno != hc->seqno)
return ENGINE_ACTIVE_SEQNO;
if (intel_engine_is_idle(engine))
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index f2f6e806621d..9fe11f6ffd42 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -180,6 +180,12 @@ static inline u32 intel_hws_seqno_address(struct intel_engine_cs *engine)
I915_GEM_HWS_INDEX_ADDR);
}
+static inline u32 intel_hws_hangcheck_address(struct intel_engine_cs *engine)
+{
+ return (i915_ggtt_offset(engine->status_page.vma) +
+ I915_GEM_HWS_HANGCHECK_ADDR);
+}
+
static inline struct i915_priolist *to_priolist(struct rb_node *rb)
{
return rb_entry(rb, struct i915_priolist, node);
@@ -2201,6 +2207,10 @@ static u32 *gen8_emit_fini_breadcrumb(struct i915_request *request, u32 *cs)
request->fence.seqno,
request->timeline->hwsp_offset);
+ cs = gen8_emit_ggtt_write(cs,
+ intel_engine_next_hangcheck_seqno(request->engine),
+ intel_hws_hangcheck_address(request->engine));
+
cs = gen8_emit_ggtt_write(cs,
request->global_seqno,
intel_hws_seqno_address(request->engine));
@@ -2225,6 +2235,11 @@ static u32 *gen8_emit_fini_breadcrumb_rcs(struct i915_request *request, u32 *cs)
PIPE_CONTROL_FLUSH_ENABLE |
PIPE_CONTROL_CS_STALL);
+ cs = gen8_emit_ggtt_write_rcs(cs,
+ intel_engine_next_hangcheck_seqno(request->engine),
+ intel_hws_hangcheck_address(request->engine),
+ PIPE_CONTROL_CS_STALL);
+
cs = gen8_emit_ggtt_write_rcs(cs,
request->global_seqno,
intel_hws_seqno_address(request->engine),
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index b889b27f8aeb..a1c85a338d50 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -460,12 +460,15 @@ static u32 *gen6_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
*cs++ = I915_GEM_HWS_SEQNO_ADDR | MI_FLUSH_DW_USE_GTT;
*cs++ = rq->fence.seqno;
+ *cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX;
+ *cs++ = I915_GEM_HWS_HANGCHECK_ADDR | MI_FLUSH_DW_USE_GTT;
+ *cs++ = intel_engine_next_hangcheck_seqno(rq->engine);
+
*cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX;
*cs++ = I915_GEM_HWS_INDEX_ADDR | MI_FLUSH_DW_USE_GTT;
*cs++ = rq->global_seqno;
*cs++ = MI_USER_INTERRUPT;
- *cs++ = MI_NOOP;
rq->tail = intel_ring_offset(rq, cs);
assert_ring_tail_valid(rq->ring, rq->tail);
@@ -485,6 +488,10 @@ static u32 *gen7_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
*cs++ = I915_GEM_HWS_SEQNO_ADDR | MI_FLUSH_DW_USE_GTT;
*cs++ = rq->fence.seqno;
+ *cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX;
+ *cs++ = I915_GEM_HWS_HANGCHECK_ADDR | MI_FLUSH_DW_USE_GTT;
+ *cs++ = intel_engine_next_hangcheck_seqno(rq->engine);
+
*cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX;
*cs++ = I915_GEM_HWS_INDEX_ADDR | MI_FLUSH_DW_USE_GTT;
*cs++ = rq->global_seqno;
@@ -500,6 +507,7 @@ static u32 *gen7_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
*cs++ = 0;
*cs++ = MI_USER_INTERRUPT;
+ *cs++ = MI_NOOP;
rq->tail = intel_ring_offset(rq, cs);
assert_ring_tail_valid(rq->ring, rq->tail);
@@ -943,11 +951,16 @@ static u32 *i9xx_emit_breadcrumb(struct i915_request *rq, u32 *cs)
*cs++ = I915_GEM_HWS_SEQNO_ADDR;
*cs++ = rq->fence.seqno;
+ *cs++ = MI_STORE_DWORD_INDEX;
+ *cs++ = I915_GEM_HWS_HANGCHECK_ADDR;
+ *cs++ = intel_engine_next_hangcheck_seqno(rq->engine);
+
*cs++ = MI_STORE_DWORD_INDEX;
*cs++ = I915_GEM_HWS_INDEX_ADDR;
*cs++ = rq->global_seqno;
*cs++ = MI_USER_INTERRUPT;
+ *cs++ = MI_NOOP;
rq->tail = intel_ring_offset(rq, cs);
assert_ring_tail_valid(rq->ring, rq->tail);
@@ -969,6 +982,10 @@ static u32 *gen5_emit_breadcrumb(struct i915_request *rq, u32 *cs)
*cs++ = I915_GEM_HWS_SEQNO_ADDR;
*cs++ = rq->fence.seqno;
+ *cs++ = MI_STORE_DWORD_INDEX;
+ *cs++ = I915_GEM_HWS_HANGCHECK_ADDR;
+ *cs++ = intel_engine_next_hangcheck_seqno(rq->engine);
+
BUILD_BUG_ON(GEN5_WA_STORES < 1);
for (i = 0; i < GEN5_WA_STORES; i++) {
*cs++ = MI_STORE_DWORD_INDEX;
@@ -977,7 +994,6 @@ static u32 *gen5_emit_breadcrumb(struct i915_request *rq, u32 *cs)
}
*cs++ = MI_USER_INTERRUPT;
- *cs++ = MI_NOOP;
rq->tail = intel_ring_offset(rq, cs);
assert_ring_tail_valid(rq->ring, rq->tail);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 59be6e5890d9..994e47d9e218 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -6,6 +6,7 @@
#include <linux/hashtable.h>
#include <linux/irq_work.h>
+#include <linux/random.h>
#include <linux/seqlock.h>
#include "i915_gem_batch_pool.h"
@@ -119,7 +120,8 @@ struct intel_instdone {
struct intel_engine_hangcheck {
u64 acthd;
- u32 seqno;
+ u32 last_seqno;
+ u32 next_seqno;
unsigned long action_timestamp;
struct intel_instdone instdone;
};
@@ -711,6 +713,8 @@ intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
#define I915_GEM_HWS_INDEX_ADDR (I915_GEM_HWS_INDEX * sizeof(u32))
#define I915_GEM_HWS_PREEMPT 0x32
#define I915_GEM_HWS_PREEMPT_ADDR (I915_GEM_HWS_PREEMPT * sizeof(u32))
+#define I915_GEM_HWS_HANGCHECK 0x34
+#define I915_GEM_HWS_HANGCHECK_ADDR (I915_GEM_HWS_HANGCHECK * sizeof(u32))
#define I915_GEM_HWS_SEQNO 0x40
#define I915_GEM_HWS_SEQNO_ADDR (I915_GEM_HWS_SEQNO * sizeof(u32))
#define I915_GEM_HWS_SCRATCH 0x80
@@ -1059,4 +1063,17 @@ static inline bool inject_preempt_hang(struct intel_engine_execlists *execlists)
#endif
+static inline u32 intel_engine_next_hangcheck_seqno(struct intel_engine_cs *engine)
+{
+ engine->hangcheck.next_seqno =
+ next_pseudo_random32(engine->hangcheck.next_seqno);
+
+ return engine->hangcheck.next_seqno;
+}
+
+static inline u32 intel_engine_get_hangcheck_seqno(struct intel_engine_cs *engine)
+{
+ return intel_read_status_page(engine, I915_GEM_HWS_HANGCHECK);
+}
+
#endif /* _INTEL_RINGBUFFER_H_ */
--
2.20.1
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