[Intel-gfx] [PATCH] drm/i915/gt: Hook up CS_MASTER_ERROR_INTERRUPT
Chris Wilson
chris at chris-wilson.co.uk
Tue Jan 28 15:04:29 UTC 2020
Now that we have offline error capture and can reset an engine from
inside an atomic context while also preserving the GPU state for
post-mortem analysis, it is time to handle error interrupts thrown by
the command parser.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 8 +-
drivers/gpu/drm/i915/gt/intel_engine_types.h | 10 ++
drivers/gpu/drm/i915/gt/intel_gt.c | 5 +
drivers/gpu/drm/i915/gt/intel_gt_irq.c | 27 ++-
drivers/gpu/drm/i915/gt/intel_lrc.c | 57 +++++--
drivers/gpu/drm/i915/gt/selftest_lrc.c | 166 +++++++++++++++++--
drivers/gpu/drm/i915/i915_gpu_error.c | 2 +
drivers/gpu/drm/i915/i915_gpu_error.h | 1 +
drivers/gpu/drm/i915/i915_reg.h | 5 +-
9 files changed, 246 insertions(+), 35 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 9b965d1f811d..39fe9a5b4820 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1293,8 +1293,14 @@ static void intel_engine_print_registers(struct intel_engine_cs *engine,
}
if (INTEL_GEN(dev_priv) >= 6) {
- drm_printf(m, "\tRING_IMR: %08x\n",
+ drm_printf(m, "\tRING_IMR: 0x%08x\n",
ENGINE_READ(engine, RING_IMR));
+ drm_printf(m, "\tRING_ESR: 0x%08x\n",
+ ENGINE_READ(engine, RING_ESR));
+ drm_printf(m, "\tRING_EMR: 0x%08x\n",
+ ENGINE_READ(engine, RING_EMR));
+ drm_printf(m, "\tRING_EIR: 0x%08x\n",
+ ENGINE_READ(engine, RING_EIR));
}
addr = intel_engine_get_active_head(engine);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 92be41a6903c..abd1de3b83a8 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -156,6 +156,16 @@ struct intel_engine_execlists {
*/
struct i915_priolist default_priolist;
+ /**
+ * @error_interrupt: CS Master EIR
+ *
+ * The CS generates an interrupt when it detects an error. We capture
+ * the first error interrupt, record the EIR and schedule the tasklet.
+ * In the tasklet, we process the pending CS events to ensure we have
+ * the guilty request, and then reset the engine.
+ */
+ u32 error_interrupt;
+
/**
* @no_priolist: priority lists disabled
*/
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 88b6c904607c..143268083135 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -455,6 +455,11 @@ static int __engines_record_defaults(struct intel_gt *gt)
if (!rq)
continue;
+ if (rq->fence.error) {
+ err = -EIO;
+ goto out;
+ }
+
GEM_BUG_ON(!test_bit(CONTEXT_ALLOC_BIT, &rq->context->flags));
state = rq->context->state;
if (!state)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_irq.c b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
index 7278b10e1a03..864efaf1eb37 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_irq.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_irq.c
@@ -24,6 +24,21 @@ cs_irq_handler(struct intel_engine_cs *engine, u32 iir)
{
bool tasklet = false;
+ if (unlikely(iir & GT_CS_MASTER_ERROR_INTERRUPT)) {
+ u32 eir;
+
+ eir = ENGINE_READ(engine, RING_EIR);
+ ENGINE_TRACE(engine, "CS error: %x\n", eir);
+
+ /* Disable the error interrupt until after the reset */
+ if (likely(eir)) {
+ ENGINE_WRITE(engine, RING_EMR, ~0u);
+ ENGINE_WRITE(engine, RING_EIR, eir);
+ engine->execlists.error_interrupt = eir;
+ tasklet = true;
+ }
+ }
+
if (iir & GT_CONTEXT_SWITCH_INTERRUPT)
tasklet = true;
@@ -210,7 +225,10 @@ void gen11_gt_irq_reset(struct intel_gt *gt)
void gen11_gt_irq_postinstall(struct intel_gt *gt)
{
- const u32 irqs = GT_RENDER_USER_INTERRUPT | GT_CONTEXT_SWITCH_INTERRUPT;
+ const u32 irqs =
+ GT_CS_MASTER_ERROR_INTERRUPT |
+ GT_RENDER_USER_INTERRUPT |
+ GT_CONTEXT_SWITCH_INTERRUPT;
struct intel_uncore *uncore = gt->uncore;
const u32 dmask = irqs << 16 | irqs;
const u32 smask = irqs << 16;
@@ -279,7 +297,7 @@ void gen6_gt_irq_handler(struct intel_gt *gt, u32 gt_iir)
if (gt_iir & (GT_BLT_CS_ERROR_INTERRUPT |
GT_BSD_CS_ERROR_INTERRUPT |
- GT_RENDER_CS_MASTER_ERROR_INTERRUPT))
+ GT_CS_MASTER_ERROR_INTERRUPT))
DRM_DEBUG("Command parser error, gt_iir 0x%08x\n", gt_iir);
if (gt_iir & GT_PARITY_ERROR(gt->i915))
@@ -345,7 +363,10 @@ void gen8_gt_irq_reset(struct intel_gt *gt)
void gen8_gt_irq_postinstall(struct intel_gt *gt)
{
/* These are interrupts we'll toggle with the ring mask register */
- const u32 irqs = GT_RENDER_USER_INTERRUPT | GT_CONTEXT_SWITCH_INTERRUPT;
+ const u32 irqs =
+ GT_CS_MASTER_ERROR_INTERRUPT |
+ GT_RENDER_USER_INTERRUPT |
+ GT_CONTEXT_SWITCH_INTERRUPT;
const u32 gt_interrupts[] = {
irqs << GEN8_RCS_IRQ_SHIFT | irqs << GEN8_BCS_IRQ_SHIFT,
irqs << GEN8_VCS0_IRQ_SHIFT | irqs << GEN8_VCS1_IRQ_SHIFT,
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index cf6c43bd540a..1b6aab05fde1 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2613,13 +2613,13 @@ static bool execlists_capture(struct intel_engine_cs *engine)
if (!cap)
return true;
+ spin_lock_irq(&engine->active.lock);
cap->rq = execlists_active(&engine->execlists);
- GEM_BUG_ON(!cap->rq);
-
- rcu_read_lock();
- cap->rq = active_request(cap->rq->context->timeline, cap->rq);
- cap->rq = i915_request_get_rcu(cap->rq);
- rcu_read_unlock();
+ if (cap->rq) {
+ cap->rq = active_request(cap->rq->context->timeline, cap->rq);
+ cap->rq = i915_request_get_rcu(cap->rq);
+ }
+ spin_unlock_irq(&engine->active.lock);
if (!cap->rq)
goto err_free;
@@ -2658,27 +2658,25 @@ static bool execlists_capture(struct intel_engine_cs *engine)
return false;
}
-static noinline void preempt_reset(struct intel_engine_cs *engine)
+static void execlists_reset(struct intel_engine_cs *engine, const char *msg)
{
const unsigned int bit = I915_RESET_ENGINE + engine->id;
unsigned long *lock = &engine->gt->reset.flags;
- if (i915_modparams.reset < 3)
+ if (!intel_has_reset_engine(engine->gt))
return;
if (test_and_set_bit(bit, lock))
return;
+ ENGINE_TRACE(engine, "reset for %s\n", msg);
+
/* Mark this tasklet as disabled to avoid waiting for it to complete */
tasklet_disable_nosync(&engine->execlists.tasklet);
- ENGINE_TRACE(engine, "preempt timeout %lu+%ums\n",
- READ_ONCE(engine->props.preempt_timeout_ms),
- jiffies_to_msecs(jiffies - engine->execlists.preempt.expires));
-
ring_set_paused(engine, 1); /* Freeze the current request in place */
if (execlists_capture(engine))
- intel_engine_reset(engine, "preemption time out");
+ intel_engine_reset(engine, msg);
else
ring_set_paused(engine, 0);
@@ -2709,6 +2707,13 @@ static void execlists_submission_tasklet(unsigned long data)
bool timeout = preempt_timeout(engine);
process_csb(engine);
+
+ if (unlikely(engine->execlists.error_interrupt)) {
+ engine->execlists.error_interrupt = 0;
+ if (ENGINE_READ(engine, RING_ESR)) /* confirm the error */
+ execlists_reset(engine, "CS error");
+ }
+
if (!READ_ONCE(engine->execlists.pending[0]) || timeout) {
unsigned long flags;
@@ -2717,8 +2722,8 @@ static void execlists_submission_tasklet(unsigned long data)
spin_unlock_irqrestore(&engine->active.lock, flags);
/* Recheck after serialising with direct-submission */
- if (timeout && preempt_timeout(engine))
- preempt_reset(engine);
+ if (unlikely(timeout && preempt_timeout(engine)))
+ execlists_reset(engine, "preemption time out");
}
}
@@ -3343,6 +3348,25 @@ static int intel_init_workaround_bb(struct intel_engine_cs *engine)
return ret;
}
+static void enable_error_interrupt(struct intel_engine_cs *engine)
+{
+ u32 status;
+
+ engine->execlists.error_interrupt = 0;
+ ENGINE_WRITE(engine, RING_EMR, ~0u);
+ ENGINE_WRITE(engine, RING_EIR, ~0u); /* clear all existing errors */
+
+ status = ENGINE_READ(engine, RING_ESR);
+ if (unlikely(status)) {
+ dev_err(engine->i915->drm.dev,
+ "engine '%s' resumed still in error: %08x\n",
+ engine->name, status);
+ __intel_gt_reset(engine->gt, engine->mask);
+ }
+
+ ENGINE_WRITE(engine, RING_EMR, ~REG_BIT(0));
+}
+
static void enable_execlists(struct intel_engine_cs *engine)
{
u32 mode;
@@ -3364,6 +3388,8 @@ static void enable_execlists(struct intel_engine_cs *engine)
i915_ggtt_offset(engine->status_page.vma));
ENGINE_POSTING_READ(engine, RING_HWS_PGA);
+ enable_error_interrupt(engine);
+
engine->context_tag = 0;
}
@@ -4290,6 +4316,7 @@ logical_ring_default_irqs(struct intel_engine_cs *engine)
engine->irq_enable_mask = GT_RENDER_USER_INTERRUPT << shift;
engine->irq_keep_mask = GT_CONTEXT_SWITCH_INTERRUPT << shift;
+ engine->irq_keep_mask |= GT_CS_MASTER_ERROR_INTERRUPT << shift;
}
static void rcs_submission_override(struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 65718ca2326e..84bac953d1b7 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -68,6 +68,21 @@ static void engine_heartbeat_enable(struct intel_engine_cs *engine,
engine->props.heartbeat_interval_ms = saved;
}
+static int wait_for_submit(struct intel_engine_cs *engine,
+ struct i915_request *rq,
+ unsigned long timeout)
+{
+ timeout += jiffies;
+ do {
+ cond_resched();
+ intel_engine_flush_submission(engine);
+ if (i915_request_is_active(rq))
+ return 0;
+ } while (time_before(jiffies, timeout));
+
+ return -ETIME;
+}
+
static int live_sanitycheck(void *arg)
{
struct intel_gt *gt = arg;
@@ -386,6 +401,141 @@ static int live_hold_reset(void *arg)
return err;
}
+static const char *error_repr(int err)
+{
+ return err ? "bad" : "good";
+}
+
+static int live_error_interrupt(void *arg)
+{
+ static const struct error_phase {
+ enum { GOOD = 0, BAD = -EIO } error[2];
+ } phases[] = {
+ { { BAD, GOOD } },
+ { { BAD, BAD } },
+ { { BAD, GOOD } },
+ { { GOOD, GOOD } }, /* sentinel */
+ };
+ struct intel_gt *gt = arg;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ /*
+ * We hook up the CS_MASTER_ERROR_INTERRUPT to have forewarning
+ * of invalid commands in user batches that will cause a GPU hang.
+ * This is a faster mechanism than using hangcheck/heartbeats, but
+ * only detects problems the HW knows about -- it will not warn when
+ * we kill the HW!
+ *
+ * To verify our detection and reset, we throw some invalid commands
+ * at the HW and wait for the interrupt.
+ */
+
+ if (!intel_has_reset_engine(gt))
+ return 0;
+
+ for_each_engine(engine, gt, id) {
+ const struct error_phase *p;
+ unsigned long heartbeat;
+
+ engine_heartbeat_disable(engine, &heartbeat);
+
+ for (p = phases; p->error[0] != GOOD; p++) {
+ struct i915_request *client[ARRAY_SIZE(phases->error)];
+ int err = 0, i;
+ u32 *cs;
+
+ memset(client, 0, sizeof(*client));
+ for (i = 0; i < ARRAY_SIZE(client); i++) {
+ struct intel_context *ce;
+ struct i915_request *rq;
+
+ ce = intel_context_create(engine);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ goto out;
+ }
+
+ rq = intel_context_create_request(ce);
+ intel_context_put(ce);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto out;
+ }
+
+ if (rq->engine->emit_init_breadcrumb) {
+ err = rq->engine->emit_init_breadcrumb(rq);
+ if (err) {
+ i915_request_add(rq);
+ goto out;
+ }
+ }
+
+ cs = intel_ring_begin(rq, 2);
+ if (IS_ERR(cs)) {
+ i915_request_add(rq);
+ err = PTR_ERR(cs);
+ goto out;
+ }
+
+ if (p->error[i]) {
+ *cs++ = 0xdeadbeef;
+ *cs++ = 0xdeadbeef;
+ } else {
+ *cs++ = MI_NOOP;
+ *cs++ = MI_NOOP;
+ }
+
+ client[i] = i915_request_get(rq);
+ i915_request_add(rq);
+ }
+
+ err = wait_for_submit(engine, client[0], HZ / 2);
+ if (err) {
+ pr_err("%s: first request did not start within time!\n",
+ engine->name);
+ err = -ETIME;
+ goto out;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(client); i++) {
+ if (i915_request_wait(client[i], 0, HZ / 5) < 0) {
+ pr_err("%s: %s request still executing!\n",
+ engine->name,
+ error_repr(p->error[i]));
+ err = -ETIME;
+ goto out;
+ }
+
+ if (client[i]->fence.error != p->error[i]) {
+ pr_err("%s: %s request completed with wrong error code: %d\n",
+ engine->name,
+ error_repr(p->error[i]),
+ client[i]->fence.error);
+ err = -EINVAL;
+ goto out;
+ }
+ }
+
+out:
+ for (i = 0; i < ARRAY_SIZE(client); i++)
+ if (client[i])
+ i915_request_put(client[i]);
+ if (err) {
+ pr_err("%s: failed at phase[%zd] { %d, %d }\n",
+ engine->name, p - phases,
+ p->error[0], p->error[1]);
+ intel_gt_set_wedged(gt);
+ return err;
+ }
+ }
+
+ engine_heartbeat_enable(engine, heartbeat);
+ }
+
+ return 0;
+}
+
static int
emit_semaphore_chain(struct i915_request *rq, struct i915_vma *vma, int idx)
{
@@ -628,21 +778,6 @@ static struct i915_request *nop_request(struct intel_engine_cs *engine)
return rq;
}
-static int wait_for_submit(struct intel_engine_cs *engine,
- struct i915_request *rq,
- unsigned long timeout)
-{
- timeout += jiffies;
- do {
- cond_resched();
- intel_engine_flush_submission(engine);
- if (i915_request_is_active(rq))
- return 0;
- } while (time_before(jiffies, timeout));
-
- return -ETIME;
-}
-
static long timeslice_threshold(const struct intel_engine_cs *engine)
{
return 2 * msecs_to_jiffies_timeout(timeslice(engine)) + 1;
@@ -3572,6 +3707,7 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915)
SUBTEST(live_unlite_switch),
SUBTEST(live_unlite_preempt),
SUBTEST(live_hold_reset),
+ SUBTEST(live_error_interrupt),
SUBTEST(live_timeslice_preempt),
SUBTEST(live_timeslice_queue),
SUBTEST(live_busywait_preempt),
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 0f67bef83106..dcab4723b17d 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -515,6 +515,7 @@ static void error_print_engine(struct drm_i915_error_state_buf *m,
(u32)(ee->acthd>>32), (u32)ee->acthd);
err_printf(m, " IPEIR: 0x%08x\n", ee->ipeir);
err_printf(m, " IPEHR: 0x%08x\n", ee->ipehr);
+ err_printf(m, " ESR: 0x%08x\n", ee->esr);
error_print_instdone(m, ee);
@@ -1102,6 +1103,7 @@ static void engine_record_registers(struct intel_engine_coredump *ee)
}
if (INTEL_GEN(i915) >= 4) {
+ ee->esr = ENGINE_READ(engine, RING_ESR);
ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h
index e4a6afed3bbf..b35bc9edd733 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.h
+++ b/drivers/gpu/drm/i915/i915_gpu_error.h
@@ -75,6 +75,7 @@ struct intel_engine_coredump {
u32 hws;
u32 ipeir;
u32 ipehr;
+ u32 esr;
u32 bbstate;
u32 instpm;
u32 instps;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b93c4c18f05c..4c72b8ac0f2e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2639,6 +2639,9 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define GEN11_MCR_SUBSLICE_MASK GEN11_MCR_SUBSLICE(0x7)
#define RING_IPEIR(base) _MMIO((base) + 0x64)
#define RING_IPEHR(base) _MMIO((base) + 0x68)
+#define RING_EIR(base) _MMIO((base) + 0xb0)
+#define RING_EMR(base) _MMIO((base) + 0xb4)
+#define RING_ESR(base) _MMIO((base) + 0xb8)
/*
* On GEN4, only the render ring INSTDONE exists and has a different
* layout than the GEN7+ version.
@@ -3088,7 +3091,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define GT_CONTEXT_SWITCH_INTERRUPT (1 << 8)
#define GT_RENDER_L3_PARITY_ERROR_INTERRUPT (1 << 5) /* !snb */
#define GT_RENDER_PIPECTL_NOTIFY_INTERRUPT (1 << 4)
-#define GT_RENDER_CS_MASTER_ERROR_INTERRUPT (1 << 3)
+#define GT_CS_MASTER_ERROR_INTERRUPT REG_BIT(3)
#define GT_RENDER_SYNC_STATUS_INTERRUPT (1 << 2)
#define GT_RENDER_DEBUG_INTERRUPT (1 << 1)
#define GT_RENDER_USER_INTERRUPT (1 << 0)
--
2.25.0
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