From 043477b088d2af61a0937754c6560002237e6741 Mon Sep 17 00:00:00 2001 From: Mika Kuoppala Date: Mon, 30 Apr 2018 10:52:59 +0300 Subject: [PATCH] drm/i915: Print error state times relative to capture Using plain jiffies in error state output makes the output time differences relative to the current system time. This is wrong as it makes output time differences dependent of when the error state is printed rather than when it is captured. Store capture jiffies into error state and use it when outputting the state to fix time differences output. v2: use engine timestamp as epoch, output formatting (Chris) v3: pass epoch to print_engine/request (Chris) Cc: Chris Wilson Signed-off-by: Mika Kuoppala Reviewed-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20180430075259.4476-1-mika.kuoppala@linux.intel.com --- drivers/gpu/drm/i915/i915_gpu_error.c | 47 ++++++++++++++++++++++----- drivers/gpu/drm/i915/i915_gpu_error.h | 2 ++ 2 files changed, 40 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index c0127965b578..1176d068f88a 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -404,15 +404,16 @@ static const char *bannable(const struct drm_i915_error_context *ctx) static void error_print_request(struct drm_i915_error_state_buf *m, const char *prefix, - const struct drm_i915_error_request *erq) + const struct drm_i915_error_request *erq, + const unsigned long epoch) { if (!erq->seqno) return; - err_printf(m, "%s pid %d, ban score %d, seqno %8x:%08x, prio %d, emitted %dms ago, head %08x, tail %08x\n", + err_printf(m, "%s pid %d, ban score %d, seqno %8x:%08x, prio %d, emitted %dms, head %08x, tail %08x\n", prefix, erq->pid, erq->ban_score, erq->context, erq->seqno, erq->sched_attr.priority, - jiffies_to_msecs(jiffies - erq->jiffies), + jiffies_to_msecs(erq->jiffies - epoch), erq->head, erq->tail); } @@ -427,7 +428,8 @@ static void error_print_context(struct drm_i915_error_state_buf *m, } static void error_print_engine(struct drm_i915_error_state_buf *m, - const struct drm_i915_error_engine *ee) + const struct drm_i915_error_engine *ee, + const unsigned long epoch) { int n; @@ -497,14 +499,15 @@ static void error_print_engine(struct drm_i915_error_state_buf *m, err_printf(m, " hangcheck stall: %s\n", yesno(ee->hangcheck_stalled)); err_printf(m, " hangcheck action: %s\n", hangcheck_action_to_str(ee->hangcheck_action)); - err_printf(m, " hangcheck action timestamp: %lu, %u ms ago\n", + err_printf(m, " hangcheck action timestamp: %dms (%lu%s)\n", + jiffies_to_msecs(ee->hangcheck_timestamp - epoch), ee->hangcheck_timestamp, - jiffies_to_msecs(jiffies - ee->hangcheck_timestamp)); + ee->hangcheck_timestamp == epoch ? "; epoch" : ""); err_printf(m, " engine reset count: %u\n", ee->reset_count); for (n = 0; n < ee->num_ports; n++) { err_printf(m, " ELSP[%d]:", n); - error_print_request(m, " ", &ee->execlist[n]); + error_print_request(m, " ", &ee->execlist[n], epoch); } error_print_context(m, " Active context: ", &ee->context); @@ -650,6 +653,11 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m, ts = ktime_to_timespec64(error->uptime); err_printf(m, "Uptime: %lld s %ld us\n", (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC); + err_printf(m, "Epoch: %lu jiffies (%u HZ)\n", error->epoch, HZ); + err_printf(m, "Capture: %lu jiffies; %d ms ago, %d ms after epoch\n", + error->capture, + jiffies_to_msecs(jiffies - error->capture), + jiffies_to_msecs(error->capture - error->epoch)); for (i = 0; i < ARRAY_SIZE(error->engine); i++) { if (error->engine[i].hangcheck_stalled && @@ -710,7 +718,7 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m, for (i = 0; i < ARRAY_SIZE(error->engine); i++) { if (error->engine[i].engine_id != -1) - error_print_engine(m, &error->engine[i]); + error_print_engine(m, &error->engine[i], error->epoch); } for (i = 0; i < ARRAY_SIZE(error->active_vm); i++) { @@ -769,7 +777,9 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m, dev_priv->engine[i]->name, ee->num_requests); for (j = 0; j < ee->num_requests; j++) - error_print_request(m, " ", &ee->requests[j]); + error_print_request(m, " ", + &ee->requests[j], + error->epoch); } if (IS_ERR(ee->waiters)) { @@ -1736,6 +1746,22 @@ static void capture_params(struct i915_gpu_state *error) #undef DUP } +static unsigned long capture_find_epoch(const struct i915_gpu_state *error) +{ + unsigned long epoch = error->capture; + int i; + + for (i = 0; i < ARRAY_SIZE(error->engine); i++) { + const struct drm_i915_error_engine *ee = &error->engine[i]; + + if (ee->hangcheck_stalled && + time_before(ee->hangcheck_timestamp, epoch)) + epoch = ee->hangcheck_timestamp; + } + + return epoch; +} + static int capture(void *data) { struct i915_gpu_state *error = data; @@ -1744,6 +1770,7 @@ static int capture(void *data) error->boottime = ktime_get_boottime(); error->uptime = ktime_sub(ktime_get(), error->i915->gt.last_init_time); + error->capture = jiffies; capture_params(error); capture_gen_state(error); @@ -1757,6 +1784,8 @@ static int capture(void *data) error->overlay = intel_overlay_capture_error_state(error->i915); error->display = intel_display_capture_error_state(error->i915); + error->epoch = capture_find_epoch(error); + return 0; } diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h index 5d6fdcbc092c..0accd2ed72d9 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.h +++ b/drivers/gpu/drm/i915/i915_gpu_error.h @@ -31,6 +31,8 @@ struct i915_gpu_state { ktime_t time; ktime_t boottime; ktime_t uptime; + unsigned long capture; + unsigned long epoch; struct drm_i915_private *i915;