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drm/i915: Record the current requests queue for execlists upon hang 

Mika wanted to know what requests were pending at the time of a hang as
we now track which requests we have submitted to the hardware.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161013101815.26978-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-10-13 11:18:14 +01:00
parent db49296ba1
commit 35ca039e0a
2 changed files with 47 additions and 20 deletions
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3
drivers/gpu/drm/i915/i915_drv.h
View File

@ -832,10 +832,11 @@ struct drm_i915_error_state {
struct drm_i915_error_request {
long jiffies;
pid_t pid;
u32 context;
u32 seqno;
u32 head;
u32 tail;
} *requests;
} *requests, execlist[2];
struct drm_i915_error_waiter {
char comm[TASK_COMM_LEN];

64
drivers/gpu/drm/i915/i915_gpu_error.c
View File

@ -363,6 +363,20 @@ static void error_print_instdone(struct drm_i915_error_state_buf *m,
ee->instdone.row[slice][subslice]);
}
static void error_print_request(struct drm_i915_error_state_buf *m,
const char *prefix,
struct drm_i915_error_request *erq)
{
if (!erq->seqno)
return;
err_printf(m, "%s pid %d, seqno %8x:%08x, emitted %dms ago, head %08x, tail %08x\n",
prefix, erq->pid,
erq->context, erq->seqno,
jiffies_to_msecs(jiffies - erq->jiffies),
erq->head, erq->tail);
}
static void error_print_engine(struct drm_i915_error_state_buf *m,
struct drm_i915_error_engine *ee)
{
@ -434,6 +448,8 @@ static void error_print_engine(struct drm_i915_error_state_buf *m,
err_printf(m, " hangcheck: %s [%d]\n",
hangcheck_action_to_str(ee->hangcheck_action),
ee->hangcheck_score);
error_print_request(m, " ELSP[0]: ", &ee->execlist[0]);
error_print_request(m, " ELSP[1]: ", &ee->execlist[1]);
}
void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
@ -649,14 +665,8 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
err_printf(m, "%s --- %d requests\n",
dev_priv->engine[i].name,
ee->num_requests);
for (j = 0; j < ee->num_requests; j++) {
err_printf(m, " pid %d, seqno 0x%08x, emitted %ld, head 0x%08x, tail 0x%08x\n",
ee->requests[j].pid,
ee->requests[j].seqno,
ee->requests[j].jiffies,
ee->requests[j].head,
ee->requests[j].tail);
}
for (j = 0; j < ee->num_requests; j++)
error_print_request(m, " ", &ee->requests[j]);
}
if (IS_ERR(ee->waiters)) {
@ -1155,6 +1165,20 @@ static void error_record_engine_registers(struct drm_i915_error_state *error,
}
}
static void record_request(struct drm_i915_gem_request *request,
struct drm_i915_error_request *erq)
{
erq->context = request->ctx->hw_id;
erq->seqno = request->fence.seqno;
erq->jiffies = request->emitted_jiffies;
erq->head = request->head;
erq->tail = request->tail;
rcu_read_lock();
erq->pid = request->ctx->pid ? pid_nr(request->ctx->pid) : 0;
rcu_read_unlock();
}
static void engine_record_requests(struct intel_engine_cs *engine,
struct drm_i915_gem_request *first,
struct drm_i915_error_engine *ee)
@ -1178,8 +1202,6 @@ static void engine_record_requests(struct intel_engine_cs *engine,
count = 0;
request = first;
list_for_each_entry_from(request, &engine->request_list, link) {
struct drm_i915_error_request *erq;
if (count >= ee->num_requests) {
/*
* If the ring request list was changed in
@ -1199,19 +1221,22 @@ static void engine_record_requests(struct intel_engine_cs *engine,
break;
}
erq = &ee->requests[count++];
erq->seqno = request->fence.seqno;
erq->jiffies = request->emitted_jiffies;
erq->head = request->head;
erq->tail = request->tail;
rcu_read_lock();
erq->pid = request->ctx->pid ? pid_nr(request->ctx->pid) : 0;
rcu_read_unlock();
record_request(request, &ee->requests[count++]);
}
ee->num_requests = count;
}
static void error_record_engine_execlists(struct intel_engine_cs *engine,
struct drm_i915_error_engine *ee)
{
unsigned int n;
for (n = 0; n < ARRAY_SIZE(engine->execlist_port); n++)
if (engine->execlist_port[n].request)
record_request(engine->execlist_port[n].request,
&ee->execlist[n]);
}
static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
struct drm_i915_error_state *error)
{
@ -1236,6 +1261,7 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
error_record_engine_registers(error, engine, ee);
error_record_engine_waiters(engine, ee);
error_record_engine_execlists(engine, ee);
request = i915_gem_find_active_request(engine);
if (request) {