i915/pmu: Add support for total context runtime for GuC back-end

GPU accumulates the context runtime in a 32 bit counter - CTX_TIMESTAMP
in the context image. This value is saved/restored on context switches.
KMD accumulates these values into a 64 bit counter taking care of any
overflows as needed. This count provides the basis for client specific
busyness in the fdinfo interface.

KMD accumulation happens just before the context is unpinned and when
context switches out. This works for execlist back-end since execlist
scheduling has visibility into context switches. With GuC mode, KMD does
not have visibility into context switches and this counter is
accumulated only when context is unpinned. Context is unpinned once the
context scheduling is successfully disabled. Disabling context
scheduling is an asynchronous operation. Also if a context is servicing
frequent requests, scheduling may never be disabled on it.

For GuC mode, since updates to the context runtime may be delayed, add
hooks to update the context runtime in a worker thread as well as when
a user queries for it.

Limitation:
- If a context is never switched out or runs for a long period of time,
  the runtime value of CTX_TIMESTAMP may never be updated, so the
  counter value may be unreliable. This patch does not support such
  cases. Such support must be available from the GuC FW and it is WIP.

This patch is an extract from previous work authored by John/Umesh here -
https://patchwork.freedesktop.org/patch/496441/?series=105085&rev=4

v2: (Ashutosh)
- Drop COPS_RUNTIME_ACTIVE_TOTAL
- s/guc_context_update_clks/__guc_context_update_stats
- Pin context before accessing in guc_timestamp_ping
- In guc_context_unpin, use spinlock to serialize access to runtime stats
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Co-developed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230427224705.2785566-2-umesh.nerlige.ramappa@intel.com

drivers/gpu/drm/i915/gt/intel_context.c

@@ -578,10 +578,13 @@ void intel_context_bind_parent_child(struct intel_context *parent,
 	child->parallel.parent = parent;
 }
 
-u64 intel_context_get_total_runtime_ns(const struct intel_context *ce)
+u64 intel_context_get_total_runtime_ns(struct intel_context *ce)
 {
 	u64 total, active;
 
+	if (ce->ops->update_stats)
+		ce->ops->update_stats(ce);
+
 	total = ce->stats.runtime.total;
 	if (ce->ops->flags & COPS_RUNTIME_CYCLES)
 		total *= ce->engine->gt->clock_period_ns;

drivers/gpu/drm/i915/gt/intel_context.h

@@ -375,7 +375,7 @@ intel_context_clear_nopreempt(struct intel_context *ce)
 	clear_bit(CONTEXT_NOPREEMPT, &ce->flags);
 }
 
-u64 intel_context_get_total_runtime_ns(const struct intel_context *ce);
+u64 intel_context_get_total_runtime_ns(struct intel_context *ce);
 u64 intel_context_get_avg_runtime_ns(struct intel_context *ce);
 
 static inline u64 intel_context_clock(void)

drivers/gpu/drm/i915/gt/intel_context_types.h

@@ -58,6 +58,8 @@ struct intel_context_ops {
 
 	void (*sched_disable)(struct intel_context *ce);
 
+	void (*update_stats)(struct intel_context *ce);
+
 	void (*reset)(struct intel_context *ce);
 	void (*destroy)(struct kref *kref);
 

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

@@ -1402,13 +1402,34 @@ static void __update_guc_busyness_stats(struct intel_guc *guc)
 	spin_unlock_irqrestore(&guc->timestamp.lock, flags);
 }
 
+static void __guc_context_update_stats(struct intel_context *ce)
+{
+	struct intel_guc *guc = ce_to_guc(ce);
+	unsigned long flags;
+
+	spin_lock_irqsave(&guc->timestamp.lock, flags);
+	lrc_update_runtime(ce);
+	spin_unlock_irqrestore(&guc->timestamp.lock, flags);
+}
+
+static void guc_context_update_stats(struct intel_context *ce)
+{
+	if (!intel_context_pin_if_active(ce))
+		return;
+
+	__guc_context_update_stats(ce);
+	intel_context_unpin(ce);
+}
+
 static void guc_timestamp_ping(struct work_struct *wrk)
 {
 	struct intel_guc *guc = container_of(wrk, typeof(*guc),
 					     timestamp.work.work);
 	struct intel_uc *uc = container_of(guc, typeof(*uc), guc);
 	struct intel_gt *gt = guc_to_gt(guc);
+	struct intel_context *ce;
 	intel_wakeref_t wakeref;
+	unsigned long index;
 	int srcu, ret;
 
 	/*
@@ -1424,6 +1445,10 @@ static void guc_timestamp_ping(struct work_struct *wrk)
 	with_intel_runtime_pm(&gt->i915->runtime_pm, wakeref)
 		__update_guc_busyness_stats(guc);
 
+	/* adjust context stats for overflow */
+	xa_for_each(&guc->context_lookup, index, ce)
+		guc_context_update_stats(ce);
+
 	intel_gt_reset_unlock(gt, srcu);
 
 	guc_enable_busyness_worker(guc);
@@ -2774,6 +2799,7 @@ static void guc_context_unpin(struct intel_context *ce)
 {
 	struct intel_guc *guc = ce_to_guc(ce);
 
+	__guc_context_update_stats(ce);
 	unpin_guc_id(guc, ce);
 	lrc_unpin(ce);
 
@@ -3455,6 +3481,7 @@ static void remove_from_context(struct i915_request *rq)
 }
 
 static const struct intel_context_ops guc_context_ops = {
+	.flags = COPS_RUNTIME_CYCLES,
 	.alloc = guc_context_alloc,
 
 	.close = guc_context_close,
@@ -3473,6 +3500,8 @@ static const struct intel_context_ops guc_context_ops = {
 
 	.sched_disable = guc_context_sched_disable,
 
+	.update_stats = guc_context_update_stats,
+
 	.reset = lrc_reset,
 	.destroy = guc_context_destroy,
 
@@ -3728,6 +3757,7 @@ static int guc_virtual_context_alloc(struct intel_context *ce)
 }
 
 static const struct intel_context_ops virtual_guc_context_ops = {
+	.flags = COPS_RUNTIME_CYCLES,
 	.alloc = guc_virtual_context_alloc,
 
 	.close = guc_context_close,
@@ -3745,6 +3775,7 @@ static const struct intel_context_ops virtual_guc_context_ops = {
 	.exit = guc_virtual_context_exit,
 
 	.sched_disable = guc_context_sched_disable,
+	.update_stats = guc_context_update_stats,
 
 	.destroy = guc_context_destroy,