[Intel-gfx] [PATCH v5] drm/i915/guc: capture GuC logs if FW fails to load
Daniele Ceraolo Spurio
daniele.ceraolospurio at intel.com
Thu May 18 23:53:08 UTC 2017
On 18/05/17 10:08, Michal Wajdeczko wrote:
> On Tue, May 16, 2017 at 02:52:53PM -0700, Daniele Ceraolo Spurio wrote:
>> We're currently deleting the GuC logs if the FW fails to load, but those
>> are still useful to understand why the loading failed. Keeping the
>> object around allows us to access them after driver load is completed.
>>
>> v2: keep the object around instead of using kernel memory (chris)
>> don't store the logs in the gpu_error struct (Chris)
>> add a check on guc_log_level to avoid snapshotting empty logs
>>
>> v3: use separate debugfs for error log (Chris)
>>
>> v4: rebased
>>
>> v5: clean up obj selection, move err_load inside guc_log, move err_load
>> cleanup, rename functions (Michal)
>>
>> Cc: Chris Wilson <chris at chris-wilson.co.uk>
>> Cc: Oscar Mateo <oscar.mateo at intel.com>
>> Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
>> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
>> ---
>> drivers/gpu/drm/i915/i915_debugfs.c | 38 +++++++++++++++++++++++-------------
>> drivers/gpu/drm/i915/intel_guc_log.c | 17 ++++++++++++++++
>> drivers/gpu/drm/i915/intel_uc.c | 14 +++++++++++--
>> drivers/gpu/drm/i915/intel_uc.h | 5 +++++
>> 4 files changed, 58 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
>> index bd9abef..740395c 100644
>> --- a/drivers/gpu/drm/i915/i915_debugfs.c
>> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
>> @@ -2607,27 +2607,36 @@ static int i915_guc_stage_pool(struct seq_file *m, void *data)
>>
>> static int i915_guc_log_dump(struct seq_file *m, void *data)
>> {
>> - struct drm_i915_private *dev_priv = node_to_i915(m->private);
>> - struct drm_i915_gem_object *obj;
>> - int i = 0, pg;
>> -
>> - if (!dev_priv->guc.log.vma)
>> - return 0;
>> + struct drm_info_node *node = m->private;
>> + struct drm_i915_private *dev_priv = node_to_i915(node);
>> + bool dump_load_err = !!node->info_ent->data;
>> + struct drm_i915_gem_object *obj = NULL;
>> + u32 *log;
>> + int i = 0;
>>
>> - obj = dev_priv->guc.log.vma->obj;
>> - for (pg = 0; pg < obj->base.size / PAGE_SIZE; pg++) {
>> - u32 *log = kmap_atomic(i915_gem_object_get_page(obj, pg));
>> + if (dump_load_err)
>> + obj = dev_priv->guc.log.load_err;
>> + else if (dev_priv->guc.log.vma)
>> + obj = dev_priv->guc.log.vma->obj;
>>
>> - for (i = 0; i < PAGE_SIZE / sizeof(u32); i += 4)
>> - seq_printf(m, "0x%08x 0x%08x 0x%08x 0x%08x\n",
>> - *(log + i), *(log + i + 1),
>> - *(log + i + 2), *(log + i + 3));
>> + if (!obj)
>> + return 0;
>>
>> - kunmap_atomic(log);
>> + log = i915_gem_object_pin_map(obj, I915_MAP_WC);
>> + if (IS_ERR(log)) {
>> + seq_puts(m, "Failed to pin object\n");
>
> Hmm, quite unusual to report internal message. Maybe:
>
> DRM_DEBUG("Failed to pin object\n");
> seq_puts(m, "(log data unaccessible)\n");
>
>
>> + return PTR_ERR(log);
>> }
>>
>> + for (i = 0; i < obj->base.size / sizeof(u32); i += 4)
>> + seq_printf(m, "0x%08x 0x%08x 0x%08x 0x%08x\n",
>> + *(log + i), *(log + i + 1),
>> + *(log + i + 2), *(log + i + 3));
>> +
>> seq_putc(m, '\n');
>>
>> + i915_gem_object_unpin_map(obj);
>> +
>> return 0;
>> }
>>
>> @@ -4811,6 +4820,7 @@ static int i915_hpd_storm_ctl_open(struct inode *inode, struct file *file)
>> {"i915_guc_info", i915_guc_info, 0},
>> {"i915_guc_load_status", i915_guc_load_status_info, 0},
>> {"i915_guc_log_dump", i915_guc_log_dump, 0},
>> + {"i915_guc_load_err_log_dump", i915_guc_log_dump, 0, (void *)1},
>
> bikeshed: quite long name, maybe "i915_guc_load_log_dump" ?
I'd prefer to keep it as it is to make it explicit that it is an error log.
>
>> {"i915_guc_stage_pool", i915_guc_stage_pool, 0},
>> {"i915_huc_load_status", i915_huc_load_status_info, 0},
>> {"i915_frequency_info", i915_frequency_info, 0},
>> diff --git a/drivers/gpu/drm/i915/intel_guc_log.c b/drivers/gpu/drm/i915/intel_guc_log.c
>> index 16d3b87..31e7bec 100644
>> --- a/drivers/gpu/drm/i915/intel_guc_log.c
>> +++ b/drivers/gpu/drm/i915/intel_guc_log.c
>> @@ -660,3 +660,20 @@ void i915_guc_log_unregister(struct drm_i915_private *dev_priv)
>> guc_log_runtime_destroy(&dev_priv->guc);
>> mutex_unlock(&dev_priv->drm.struct_mutex);
>> }
>> +
>> +void intel_guc_log_capture_load_err(struct intel_guc *guc)
>> +{
>> + if (!guc->log.vma || i915.guc_log_level < 0)
>> + return;
>> +
>> + if (!guc->log.load_err)
>> + guc->log.load_err = i915_gem_object_get(guc->log.vma->obj);
>> +
>> + return;
>> +}
>> +
>> +void intel_guc_log_free_load_err(struct intel_guc *guc)
>> +{
>> + if (guc->log.load_err)
>> + i915_gem_object_put(guc->log.load_err);
>> +}
>
> Based on the discussion from IM, it looks that it would be better to keep
> guc->load_err object directly in struct intel_guc, and at the same time
> move both capture/free functions to guc_uc.c as static:
>
> void guc_capture_load_err_log(struct intel_guc *guc)
> void guc_free_load_err_log(struct intel_guc *guc)
>
>
>> diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
>> index 07c5658..dfea7d0 100644
>> --- a/drivers/gpu/drm/i915/intel_uc.c
>> +++ b/drivers/gpu/drm/i915/intel_uc.c
>> @@ -309,6 +309,7 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
>>
>> guc_disable_communication(guc);
>> gen9_reset_guc_interrupts(dev_priv);
>> + intel_guc_log_free_load_err(guc);
>
> Hmm, this will free the log from previous failed load, but I was under
> impression that you want to keep it... Maybe log reset should be done
> as explicit .write operation ?
>
True, I've removed it for now. New load attempts after the first set are
not very interesting and the process is a bit weird at the moment
because we update one of the 2 enable_guc_* parameters on load failure
but not the other. I'd prefer to consider only the first set of load
attempts until we clean all of that up unless you feel strongly about this.
>>
>> /* We need to notify the guc whenever we change the GGTT */
>> i915_ggtt_enable_guc(dev_priv);
>> @@ -355,11 +356,11 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
>>
>> /* Did we succeded or run out of retries? */
>> if (ret)
>> - goto err_submission;
>> + goto err_log_capture;
>>
>> ret = guc_enable_communication(guc);
>> if (ret)
>> - goto err_submission;
>> + goto err_log_capture;
>>
>> intel_guc_auth_huc(dev_priv);
>> if (i915.enable_guc_submission) {
>> @@ -385,6 +386,8 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
>> err_interrupts:
>> guc_disable_communication(guc);
>> gen9_disable_guc_interrupts(dev_priv);
>> +err_log_capture:
>> + intel_guc_log_capture_load_err(guc);
>> err_submission:
>> if (i915.enable_guc_submission)
>> i915_guc_submission_fini(dev_priv);
>> @@ -407,6 +410,13 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
>>
>> void intel_uc_fini_hw(struct drm_i915_private *dev_priv)
>> {
>> + /*
>> + * The err load log exists if guc failed to load, so we need to check
>> + * for it before checking the module params as we might have updated
>> + * those to reflect the load failure.
>
> Hmm, but it looks that for now we only touch enable_guc_loading in sanitize
> functions. On load failure we just disable enable_guc_submission param (which
> btw is a bad decission IMHO)
>
I was trying to be a bit future-proof here because Oscar's change in
review changes the behavior slightly (enable_guc_loading is replaced by
enable_guc_submission || HAS_HUC_FW) and we could have cases where this
is false if that goes through. I'll move it further down and keep and
eye on that patch to make sure we don't end up leaking stuff.
Thanks,
Daniele
>> + */
>> + intel_guc_log_free_load_err(&dev_priv->guc);
>> +
>> if (!i915.enable_guc_loading)
>> return;
>>
>> diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
>> index 7618b71..05fa751 100644
>> --- a/drivers/gpu/drm/i915/intel_uc.h
>> +++ b/drivers/gpu/drm/i915/intel_uc.h
>> @@ -176,6 +176,9 @@ struct intel_guc_log {
>> u32 prev_overflow_count[GUC_MAX_LOG_BUFFER];
>> u32 total_overflow_count[GUC_MAX_LOG_BUFFER];
>> u32 flush_count[GUC_MAX_LOG_BUFFER];
>> +
>> + /* Log snapshot if GuC errors during load */
>> + struct drm_i915_gem_object *load_err;
>
> As mentioned above, please move it back to guc struct, but keep
> close to the fw/log members.
>
>
> Thanks,
> Michal
>
>> };
>>
>> struct intel_guc {
>> @@ -272,6 +275,8 @@ static inline void intel_guc_notify(struct intel_guc *guc)
>> int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val);
>> void i915_guc_log_register(struct drm_i915_private *dev_priv);
>> void i915_guc_log_unregister(struct drm_i915_private *dev_priv);
>> +void intel_guc_log_capture_load_err(struct intel_guc *guc);
>> +void intel_guc_log_free_load_err(struct intel_guc *guc);
>>
>> static inline u32 guc_ggtt_offset(struct i915_vma *vma)
>> {
>> --
>> 1.9.1
>>
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