[PATCH 2/2] drm/xe/guc: Separate full CTB content from guc_info debugfs
John Harrison
john.c.harrison at intel.com
Wed Oct 23 22:40:45 UTC 2024
On 10/23/2024 15:17, Matthew Brost wrote:
> On Tue, Oct 22, 2024 at 05:17:35PM -0700, John.C.Harrison at Intel.com wrote:
>> From: John Harrison <John.C.Harrison at Intel.com>
>>
>> The guc_info debugfs file is meant to be a quick view of the current
>> software state of the GuC interface. Including the full CTN contents
>> makes the file as a whole much less human readable and is not
>> partiular useful in the general case. So don't pollute the info dump
>> with the full buffers. Instead, move those into a separate debugfs
>> entry that can be read when that information is actually required.
>>
> I did notice this when using the debugfs entry and yea a bunch of asic
> isn't all that helpful in the common case. So change LGTM but one nit.
>
>> Also, improve the human readability by adding a few extra blank lines
>> to delimt the sections.
>>
>> Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
>> ---
>> drivers/gpu/drm/xe/xe_devcoredump.c | 2 +-
>> drivers/gpu/drm/xe/xe_guc.c | 5 ++++-
>> drivers/gpu/drm/xe/xe_guc_ct.c | 25 ++++++++++++-------------
>> drivers/gpu/drm/xe/xe_guc_ct.h | 8 +++++---
>> drivers/gpu/drm/xe/xe_guc_debugfs.c | 14 ++++++++++++++
>> 5 files changed, 36 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/xe/xe_devcoredump.c b/drivers/gpu/drm/xe/xe_devcoredump.c
>> index 8b0ea77661b2..5d7d8192d6f3 100644
>> --- a/drivers/gpu/drm/xe/xe_devcoredump.c
>> +++ b/drivers/gpu/drm/xe/xe_devcoredump.c
>> @@ -267,7 +267,7 @@ static void devcoredump_snapshot(struct xe_devcoredump *coredump,
>> fw_ref = xe_force_wake_get(gt_to_fw(q->gt), XE_FORCEWAKE_ALL);
>>
>> ss->guc.log = xe_guc_log_snapshot_capture(&guc->log, true);
>> - ss->guc.ct = xe_guc_ct_snapshot_capture(&guc->ct, true);
>> + ss->guc.ct = xe_guc_ct_snapshot_capture(&guc->ct, true, true);
> One bool, not great. Two bools, yuck. Anyway to refactor this without
> bools all over the place?
It seemed excessive to create a whole set of flags. But given that this
is the only instance outside of the GuC internals, it would be simple to
create a wrapper that hides all of the internal only params.
John.
>
> Matt
>
>> ss->ge = xe_guc_exec_queue_snapshot_capture(q);
>> ss->job = xe_sched_job_snapshot_capture(job);
>> ss->vm = xe_vm_snapshot_capture(q->vm);
>> diff --git a/drivers/gpu/drm/xe/xe_guc.c b/drivers/gpu/drm/xe/xe_guc.c
>> index b065bb9973e9..fcb540003e53 100644
>> --- a/drivers/gpu/drm/xe/xe_guc.c
>> +++ b/drivers/gpu/drm/xe/xe_guc.c
>> @@ -1187,7 +1187,10 @@ void xe_guc_print_info(struct xe_guc *guc, struct drm_printer *p)
>>
>> xe_force_wake_put(gt_to_fw(gt), fw_ref);
>>
>> - xe_guc_ct_print(&guc->ct, p);
>> + drm_puts(p, "\n");
>> + xe_guc_ct_print(&guc->ct, p, false);
>> +
>> + drm_puts(p, "\n");
>> xe_guc_submit_print(guc, p);
>> }
>>
>> diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
>> index c260d8840990..352673b6974a 100644
>> --- a/drivers/gpu/drm/xe/xe_guc_ct.c
>> +++ b/drivers/gpu/drm/xe/xe_guc_ct.c
>> @@ -1607,7 +1607,8 @@ static void g2h_worker_func(struct work_struct *w)
>> receive_g2h(ct);
>> }
>>
>> -struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_alloc(struct xe_guc_ct *ct, bool atomic)
>> +struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_alloc(struct xe_guc_ct *ct, bool atomic,
>> + bool want_ctb)
>> {
>> struct xe_guc_ct_snapshot *snapshot;
>>
>> @@ -1615,7 +1616,7 @@ struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_alloc(struct xe_guc_ct *ct, bool a
>> if (!snapshot)
>> return NULL;
>>
>> - if (ct->bo) {
>> + if (ct->bo && want_ctb) {
>> snapshot->ctb_size = ct->bo->size;
>> snapshot->ctb = kmalloc(snapshot->ctb_size, atomic ? GFP_ATOMIC : GFP_KERNEL);
>> }
>> @@ -1650,6 +1651,7 @@ static void guc_ctb_snapshot_print(struct guc_ctb_snapshot *snapshot,
>> * @ct: GuC CT object.
>> * @atomic: Boolean to indicate if this is called from atomic context like
>> * reset or CTB handler or from some regular path like debugfs.
>> + * @want_ctb: Should the full CTB content be captured (vs just the headers)
>> *
>> * This can be printed out in a later stage like during dev_coredump
>> * analysis.
>> @@ -1658,12 +1660,12 @@ static void guc_ctb_snapshot_print(struct guc_ctb_snapshot *snapshot,
>> * by using `xe_guc_ct_snapshot_free`.
>> */
>> struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_capture(struct xe_guc_ct *ct,
>> - bool atomic)
>> + bool atomic, bool want_ctb)
>> {
>> struct xe_device *xe = ct_to_xe(ct);
>> struct xe_guc_ct_snapshot *snapshot;
>>
>> - snapshot = xe_guc_ct_snapshot_alloc(ct, atomic);
>> + snapshot = xe_guc_ct_snapshot_alloc(ct, atomic, want_ctb);
>> if (!snapshot) {
>> xe_gt_err(ct_to_gt(ct), "Skipping CTB snapshot entirely.\n");
>> return NULL;
>> @@ -1704,12 +1706,8 @@ void xe_guc_ct_snapshot_print(struct xe_guc_ct_snapshot *snapshot,
>> drm_printf(p, "\tg2h outstanding: %d\n",
>> snapshot->g2h_outstanding);
>>
>> - if (snapshot->ctb) {
>> + if (snapshot->ctb)
>> xe_print_blob_ascii85(p, "CTB data", snapshot->ctb, 0, snapshot->ctb_size);
>> - } else {
>> - drm_printf(p, "CTB snapshot missing!\n");
>> - return;
>> - }
>> } else {
>> drm_puts(p, "CT disabled\n");
>> }
>> @@ -1736,13 +1734,14 @@ void xe_guc_ct_snapshot_free(struct xe_guc_ct_snapshot *snapshot)
>> * @ct: GuC CT.
>> * @p: drm_printer where it will be printed out.
>> *
>> - * This function quickly capture a snapshot and immediately print it out.
>> + * This function will quickly capture a snapshot of the CT state
>> + * and immediately print it out.
>> */
>> -void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p)
>> +void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p, bool want_ctb)
>> {
>> struct xe_guc_ct_snapshot *snapshot;
>>
>> - snapshot = xe_guc_ct_snapshot_capture(ct, false);
>> + snapshot = xe_guc_ct_snapshot_capture(ct, false, want_ctb);
>> xe_guc_ct_snapshot_print(snapshot, p);
>> xe_guc_ct_snapshot_free(snapshot);
>> }
>> @@ -1776,7 +1775,7 @@ static void ct_dead_capture(struct xe_guc_ct *ct, struct guc_ctb *ctb, u32 reaso
>> return;
>>
>> snapshot_log = xe_guc_log_snapshot_capture(&guc->log, true);
>> - snapshot_ct = xe_guc_ct_snapshot_capture((ct), true);
>> + snapshot_ct = xe_guc_ct_snapshot_capture((ct), true, true);
>>
>> spin_lock_irqsave(&ct->dead.lock, flags);
>>
>> diff --git a/drivers/gpu/drm/xe/xe_guc_ct.h b/drivers/gpu/drm/xe/xe_guc_ct.h
>> index 338f0b75d29f..01d3b0183bf0 100644
>> --- a/drivers/gpu/drm/xe/xe_guc_ct.h
>> +++ b/drivers/gpu/drm/xe/xe_guc_ct.h
>> @@ -17,11 +17,13 @@ void xe_guc_ct_disable(struct xe_guc_ct *ct);
>> void xe_guc_ct_stop(struct xe_guc_ct *ct);
>> void xe_guc_ct_fast_path(struct xe_guc_ct *ct);
>>
>> -struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_alloc(struct xe_guc_ct *ct, bool atomic);
>> -struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_capture(struct xe_guc_ct *ct, bool atomic);
>> +struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_alloc(struct xe_guc_ct *ct, bool atomic,
>> + bool want_ctb);
>> +struct xe_guc_ct_snapshot *xe_guc_ct_snapshot_capture(struct xe_guc_ct *ct, bool atomic,
>> + bool want_ctb);
>> void xe_guc_ct_snapshot_print(struct xe_guc_ct_snapshot *snapshot, struct drm_printer *p);
>> void xe_guc_ct_snapshot_free(struct xe_guc_ct_snapshot *snapshot);
>> -void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p);
>> +void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p, bool want_ctb);
>>
>> static inline bool xe_guc_ct_enabled(struct xe_guc_ct *ct)
>> {
>> diff --git a/drivers/gpu/drm/xe/xe_guc_debugfs.c b/drivers/gpu/drm/xe/xe_guc_debugfs.c
>> index d3822cbea273..995b306aced7 100644
>> --- a/drivers/gpu/drm/xe/xe_guc_debugfs.c
>> +++ b/drivers/gpu/drm/xe/xe_guc_debugfs.c
>> @@ -47,9 +47,23 @@ static int guc_log(struct seq_file *m, void *data)
>> return 0;
>> }
>>
>> +static int guc_ctb(struct seq_file *m, void *data)
>> +{
>> + struct xe_guc *guc = node_to_guc(m->private);
>> + struct xe_device *xe = guc_to_xe(guc);
>> + struct drm_printer p = drm_seq_file_printer(m);
>> +
>> + xe_pm_runtime_get(xe);
>> + xe_guc_ct_print(&guc->ct, &p, true);
>> + xe_pm_runtime_put(xe);
>> +
>> + return 0;
>> +}
>> +
>> static const struct drm_info_list debugfs_list[] = {
>> {"guc_info", guc_info, 0},
>> {"guc_log", guc_log, 0},
>> + {"guc_ctb", guc_ctb, 0},
>> };
>>
>> void xe_guc_debugfs_register(struct xe_guc *guc, struct dentry *parent)
>> --
>> 2.47.0
>>
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