On Mon, Jul 19, 2021 at 04:33:56PM -0700, Daniele Ceraolo Spurio wrote:
>
>
> On 7/16/2021 1:16 PM, Matthew Brost wrote:
> > Implement GuC virtual engines. Rather simple implementation, basically
> > just allocate an engine, setup context enter / exit function to virtual
> > engine specific functions, set all other variables / functions to guc
> > versions, and set the engine mask to that of all the siblings.
> >
> > v2: Update to work with proto-ctx
> >
> > Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
> > Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/gem/i915_gem_context.c | 8 +-
> > drivers/gpu/drm/i915/gem/i915_gem_context.h | 1 +
> > drivers/gpu/drm/i915/gt/intel_context_types.h | 6 +
> > drivers/gpu/drm/i915/gt/intel_engine.h | 27 +-
> > drivers/gpu/drm/i915/gt/intel_engine_cs.c | 14 +
> > .../drm/i915/gt/intel_execlists_submission.c | 29 ++-
> > .../drm/i915/gt/intel_execlists_submission.h | 4 -
> > drivers/gpu/drm/i915/gt/selftest_execlists.c | 12 +-
> > .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 240 +++++++++++++++++-
> > .../gpu/drm/i915/gt/uc/intel_guc_submission.h | 2 +
> > 10 files changed, 308 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > index 64659802d4df..edefe299bd76 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > @@ -74,7 +74,6 @@
> > #include "gt/intel_context_param.h"
> > #include "gt/intel_engine_heartbeat.h"
> > #include "gt/intel_engine_user.h"
> > -#include "gt/intel_execlists_submission.h" /* virtual_engine */
> > #include "gt/intel_gpu_commands.h"
> > #include "gt/intel_ring.h"
> > @@ -363,9 +362,6 @@ set_proto_ctx_engines_balance(struct i915_user_extension __user *base,
> > if (!HAS_EXECLISTS(i915))
> > return -ENODEV;
> > - if (intel_uc_uses_guc_submission(&i915->gt.uc))
> > - return -ENODEV; /* not implement yet */
> > -
> > if (get_user(idx, &ext->engine_index))
> > return -EFAULT;
> > @@ -950,8 +946,8 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
> > break;
> > case I915_GEM_ENGINE_TYPE_BALANCED:
> > - ce = intel_execlists_create_virtual(pe[n].siblings,
> > - pe[n].num_siblings);
> > + ce = intel_engine_create_virtual(pe[n].siblings,
> > + pe[n].num_siblings);
> > break;
> > case I915_GEM_ENGINE_TYPE_INVALID:
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h
> > index 20411db84914..2639c719a7a6 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.h
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h
> > @@ -10,6 +10,7 @@
> > #include "i915_gem_context_types.h"
> > #include "gt/intel_context.h"
> > +#include "gt/intel_engine.h"
>
> Apologies for the late question, but why do you need this include in this
> header? nothing else is changing within the file.
>
It likely doesn't need to be included. Let me see what the build / CI
says if I remove it.
> > #include "i915_drv.h"
> > #include "i915_gem.h"
> > diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
> > index 4a5518d295c2..542c98418771 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_context_types.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
> > @@ -47,6 +47,12 @@ struct intel_context_ops {
> > void (*reset)(struct intel_context *ce);
> > void (*destroy)(struct kref *kref);
> > +
> > + /* virtual engine/context interface */
> > + struct intel_context *(*create_virtual)(struct intel_engine_cs **engine,
> > + unsigned int count);
> > + struct intel_engine_cs *(*get_sibling)(struct intel_engine_cs *engine,
> > + unsigned int sibling);
> > };
> > struct intel_context {
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
> > index f911c1224ab2..9fec0aca5f4b 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> > @@ -273,13 +273,38 @@ intel_engine_has_preempt_reset(const struct intel_engine_cs *engine)
> > return intel_engine_has_preemption(engine);
> > }
> > +struct intel_context *
> > +intel_engine_create_virtual(struct intel_engine_cs **siblings,
> > + unsigned int count);
> > +
> > +static inline bool
> > +intel_virtual_engine_has_heartbeat(const struct intel_engine_cs *engine)
> > +{
> > + if (intel_engine_uses_guc(engine))
> > + return intel_guc_virtual_engine_has_heartbeat(engine);
> > + else
> > + GEM_BUG_ON("Only should be called in GuC submission");
>
> I insist that this needs a better explanation, as I've commented on the
> previous rev. Given that this is a shared file, it is not immediately
> evident why this call shouldn't be called with the execlists backend.
>
Sure, can add a comment. Basically it comes down to it is always called
an active request which in execlists mode is always a physical engine.
Matt
> Daniele
>
> > +
> > + return false;
> > +}
> > +
> > static inline bool
> > intel_engine_has_heartbeat(const struct intel_engine_cs *engine)
> > {
> > if (!IS_ACTIVE(CONFIG_DRM_I915_HEARTBEAT_INTERVAL))
> > return false;
> > - return READ_ONCE(engine->props.heartbeat_interval_ms);
> > + if (intel_engine_is_virtual(engine))
> > + return intel_virtual_engine_has_heartbeat(engine);
> > + else
> > + return READ_ONCE(engine->props.heartbeat_interval_ms);
> > +}
> > +
> > +static inline struct intel_engine_cs *
> > +intel_engine_get_sibling(struct intel_engine_cs *engine, unsigned int sibling)
> > +{
> > + GEM_BUG_ON(!intel_engine_is_virtual(engine));
> > + return engine->cops->get_sibling(engine, sibling);
> > }
> > #endif /* _INTEL_RINGBUFFER_H_ */
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > index d561573ed98c..b7292d5cb7da 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > @@ -1737,6 +1737,20 @@ ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine, ktime_t *now)
> > return total;
> > }
> > +struct intel_context *
> > +intel_engine_create_virtual(struct intel_engine_cs **siblings,
> > + unsigned int count)
> > +{
> > + if (count == 0)
> > + return ERR_PTR(-EINVAL);
> > +
> > + if (count == 1)
> > + return intel_context_create(siblings[0]);
> > +
> > + GEM_BUG_ON(!siblings[0]->cops->create_virtual);
> > + return siblings[0]->cops->create_virtual(siblings, count);
> > +}
> > +
> > static bool match_ring(struct i915_request *rq)
> > {
> > u32 ring = ENGINE_READ(rq->engine, RING_START);
> > diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > index 56e25090da67..28492cdce706 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > @@ -193,6 +193,9 @@ static struct virtual_engine *to_virtual_engine(struct intel_engine_cs *engine)
> > return container_of(engine, struct virtual_engine, base);
> > }
> > +static struct intel_context *
> > +execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count);
> > +
> > static struct i915_request *
> > __active_request(const struct intel_timeline * const tl,
> > struct i915_request *rq,
> > @@ -2548,6 +2551,8 @@ static const struct intel_context_ops execlists_context_ops = {
> > .reset = lrc_reset,
> > .destroy = lrc_destroy,
> > +
> > + .create_virtual = execlists_create_virtual,
> > };
> > static int emit_pdps(struct i915_request *rq)
> > @@ -3493,6 +3498,17 @@ static void virtual_context_exit(struct intel_context *ce)
> > intel_engine_pm_put(ve->siblings[n]);
> > }
> > +static struct intel_engine_cs *
> > +virtual_get_sibling(struct intel_engine_cs *engine, unsigned int sibling)
> > +{
> > + struct virtual_engine *ve = to_virtual_engine(engine);
> > +
> > + if (sibling >= ve->num_siblings)
> > + return NULL;
> > +
> > + return ve->siblings[sibling];
> > +}
> > +
> > static const struct intel_context_ops virtual_context_ops = {
> > .flags = COPS_HAS_INFLIGHT,
> > @@ -3507,6 +3523,8 @@ static const struct intel_context_ops virtual_context_ops = {
> > .exit = virtual_context_exit,
> > .destroy = virtual_context_destroy,
> > +
> > + .get_sibling = virtual_get_sibling,
> > };
> > static intel_engine_mask_t virtual_submission_mask(struct virtual_engine *ve)
> > @@ -3655,20 +3673,13 @@ static void virtual_submit_request(struct i915_request *rq)
> > spin_unlock_irqrestore(&ve->base.sched_engine->lock, flags);
> > }
> > -struct intel_context *
> > -intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> > - unsigned int count)
> > +static struct intel_context *
> > +execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
> > {
> > struct virtual_engine *ve;
> > unsigned int n;
> > int err;
> > - if (count == 0)
> > - return ERR_PTR(-EINVAL);
> > -
> > - if (count == 1)
> > - return intel_context_create(siblings[0]);
> > -
> > ve = kzalloc(struct_size(ve, siblings, count), GFP_KERNEL);
> > if (!ve)
> > return ERR_PTR(-ENOMEM);
> > diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.h b/drivers/gpu/drm/i915/gt/intel_execlists_submission.h
> > index ad4f3e1a0fde..a1aa92c983a5 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.h
> > @@ -32,10 +32,6 @@ void intel_execlists_show_requests(struct intel_engine_cs *engine,
> > int indent),
> > unsigned int max);
> > -struct intel_context *
> > -intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> > - unsigned int count);
> > -
> > bool
> > intel_engine_in_execlists_submission_mode(const struct intel_engine_cs *engine);
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > index 73ddc6e14730..59cf8afc6d6f 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > @@ -3727,7 +3727,7 @@ static int nop_virtual_engine(struct intel_gt *gt,
> > GEM_BUG_ON(!nctx || nctx > ARRAY_SIZE(ve));
> > for (n = 0; n < nctx; n++) {
> > - ve[n] = intel_execlists_create_virtual(siblings, nsibling);
> > + ve[n] = intel_engine_create_virtual(siblings, nsibling);
> > if (IS_ERR(ve[n])) {
> > err = PTR_ERR(ve[n]);
> > nctx = n;
> > @@ -3923,7 +3923,7 @@ static int mask_virtual_engine(struct intel_gt *gt,
> > * restrict it to our desired engine within the virtual engine.
> > */
> > - ve = intel_execlists_create_virtual(siblings, nsibling);
> > + ve = intel_engine_create_virtual(siblings, nsibling);
> > if (IS_ERR(ve)) {
> > err = PTR_ERR(ve);
> > goto out_close;
> > @@ -4054,7 +4054,7 @@ static int slicein_virtual_engine(struct intel_gt *gt,
> > i915_request_add(rq);
> > }
> > - ce = intel_execlists_create_virtual(siblings, nsibling);
> > + ce = intel_engine_create_virtual(siblings, nsibling);
> > if (IS_ERR(ce)) {
> > err = PTR_ERR(ce);
> > goto out;
> > @@ -4106,7 +4106,7 @@ static int sliceout_virtual_engine(struct intel_gt *gt,
> > /* XXX We do not handle oversubscription and fairness with normal rq */
> > for (n = 0; n < nsibling; n++) {
> > - ce = intel_execlists_create_virtual(siblings, nsibling);
> > + ce = intel_engine_create_virtual(siblings, nsibling);
> > if (IS_ERR(ce)) {
> > err = PTR_ERR(ce);
> > goto out;
> > @@ -4208,7 +4208,7 @@ static int preserved_virtual_engine(struct intel_gt *gt,
> > if (err)
> > goto out_scratch;
> > - ve = intel_execlists_create_virtual(siblings, nsibling);
> > + ve = intel_engine_create_virtual(siblings, nsibling);
> > if (IS_ERR(ve)) {
> > err = PTR_ERR(ve);
> > goto out_scratch;
> > @@ -4348,7 +4348,7 @@ static int reset_virtual_engine(struct intel_gt *gt,
> > if (igt_spinner_init(&spin, gt))
> > return -ENOMEM;
> > - ve = intel_execlists_create_virtual(siblings, nsibling);
> > + ve = intel_engine_create_virtual(siblings, nsibling);
> > if (IS_ERR(ve)) {
> > err = PTR_ERR(ve);
> > goto out_spin;
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > index 05958260e849..7b3e1c91e689 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > @@ -60,6 +60,15 @@
> > *
> > */
> > +/* GuC Virtual Engine */
> > +struct guc_virtual_engine {
> > + struct intel_engine_cs base;
> > + struct intel_context context;
> > +};
> > +
> > +static struct intel_context *
> > +guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count);
> > +
> > #define GUC_REQUEST_SIZE 64 /* bytes */
> > /*
> > @@ -925,20 +934,35 @@ static int guc_lrc_desc_pin(struct intel_context *ce)
> > return ret;
> > }
> > -static int guc_context_pre_pin(struct intel_context *ce,
> > - struct i915_gem_ww_ctx *ww,
> > - void **vaddr)
> > +static int __guc_context_pre_pin(struct intel_context *ce,
> > + struct intel_engine_cs *engine,
> > + struct i915_gem_ww_ctx *ww,
> > + void **vaddr)
> > {
> > - return lrc_pre_pin(ce, ce->engine, ww, vaddr);
> > + return lrc_pre_pin(ce, engine, ww, vaddr);
> > }
> > -static int guc_context_pin(struct intel_context *ce, void *vaddr)
> > +static int __guc_context_pin(struct intel_context *ce,
> > + struct intel_engine_cs *engine,
> > + void *vaddr)
> > {
> > if (i915_ggtt_offset(ce->state) !=
> > (ce->lrc.lrca & CTX_GTT_ADDRESS_MASK))
> > set_bit(CONTEXT_LRCA_DIRTY, &ce->flags);
> > - return lrc_pin(ce, ce->engine, vaddr);
> > + return lrc_pin(ce, engine, vaddr);
> > +}
> > +
> > +static int guc_context_pre_pin(struct intel_context *ce,
> > + struct i915_gem_ww_ctx *ww,
> > + void **vaddr)
> > +{
> > + return __guc_context_pre_pin(ce, ce->engine, ww, vaddr);
> > +}
> > +
> > +static int guc_context_pin(struct intel_context *ce, void *vaddr)
> > +{
> > + return __guc_context_pin(ce, ce->engine, vaddr);
> > }
> > static void guc_context_unpin(struct intel_context *ce)
> > @@ -1043,6 +1067,21 @@ static inline void guc_lrc_desc_unpin(struct intel_context *ce)
> > deregister_context(ce, ce->guc_id);
> > }
> > +static void __guc_context_destroy(struct intel_context *ce)
> > +{
> > + lrc_fini(ce);
> > + intel_context_fini(ce);
> > +
> > + if (intel_engine_is_virtual(ce->engine)) {
> > + struct guc_virtual_engine *ve =
> > + container_of(ce, typeof(*ve), context);
> > +
> > + kfree(ve);
> > + } else {
> > + intel_context_free(ce);
> > + }
> > +}
> > +
> > static void guc_context_destroy(struct kref *kref)
> > {
> > struct intel_context *ce = container_of(kref, typeof(*ce), ref);
> > @@ -1059,7 +1098,7 @@ static void guc_context_destroy(struct kref *kref)
> > if (context_guc_id_invalid(ce) ||
> > !lrc_desc_registered(guc, ce->guc_id)) {
> > release_guc_id(guc, ce);
> > - lrc_destroy(kref);
> > + __guc_context_destroy(ce);
> > return;
> > }
> > @@ -1075,7 +1114,7 @@ static void guc_context_destroy(struct kref *kref)
> > if (context_guc_id_invalid(ce)) {
> > __release_guc_id(guc, ce);
> > spin_unlock_irqrestore(&guc->contexts_lock, flags);
> > - lrc_destroy(kref);
> > + __guc_context_destroy(ce);
> > return;
> > }
> > @@ -1120,6 +1159,8 @@ static const struct intel_context_ops guc_context_ops = {
> > .reset = lrc_reset,
> > .destroy = guc_context_destroy,
> > +
> > + .create_virtual = guc_create_virtual,
> > };
> > static void __guc_signal_context_fence(struct intel_context *ce)
> > @@ -1248,6 +1289,83 @@ static int guc_request_alloc(struct i915_request *rq)
> > return 0;
> > }
> > +static struct intel_engine_cs *
> > +guc_virtual_get_sibling(struct intel_engine_cs *ve, unsigned int sibling)
> > +{
> > + struct intel_engine_cs *engine;
> > + intel_engine_mask_t tmp, mask = ve->mask;
> > + unsigned int num_siblings = 0;
> > +
> > + for_each_engine_masked(engine, ve->gt, mask, tmp)
> > + if (num_siblings++ == sibling)
> > + return engine;
> > +
> > + return NULL;
> > +}
> > +
> > +static int guc_virtual_context_pre_pin(struct intel_context *ce,
> > + struct i915_gem_ww_ctx *ww,
> > + void **vaddr)
> > +{
> > + struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);
> > +
> > + return __guc_context_pre_pin(ce, engine, ww, vaddr);
> > +}
> > +
> > +static int guc_virtual_context_pin(struct intel_context *ce, void *vaddr)
> > +{
> > + struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);
> > +
> > + return __guc_context_pin(ce, engine, vaddr);
> > +}
> > +
> > +static void guc_virtual_context_enter(struct intel_context *ce)
> > +{
> > + intel_engine_mask_t tmp, mask = ce->engine->mask;
> > + struct intel_engine_cs *engine;
> > +
> > + for_each_engine_masked(engine, ce->engine->gt, mask, tmp)
> > + intel_engine_pm_get(engine);
> > +
> > + intel_timeline_enter(ce->timeline);
> > +}
> > +
> > +static void guc_virtual_context_exit(struct intel_context *ce)
> > +{
> > + intel_engine_mask_t tmp, mask = ce->engine->mask;
> > + struct intel_engine_cs *engine;
> > +
> > + for_each_engine_masked(engine, ce->engine->gt, mask, tmp)
> > + intel_engine_pm_put(engine);
> > +
> > + intel_timeline_exit(ce->timeline);
> > +}
> > +
> > +static int guc_virtual_context_alloc(struct intel_context *ce)
> > +{
> > + struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);
> > +
> > + return lrc_alloc(ce, engine);
> > +}
> > +
> > +static const struct intel_context_ops virtual_guc_context_ops = {
> > + .alloc = guc_virtual_context_alloc,
> > +
> > + .pre_pin = guc_virtual_context_pre_pin,
> > + .pin = guc_virtual_context_pin,
> > + .unpin = guc_context_unpin,
> > + .post_unpin = guc_context_post_unpin,
> > +
> > + .enter = guc_virtual_context_enter,
> > + .exit = guc_virtual_context_exit,
> > +
> > + .sched_disable = guc_context_sched_disable,
> > +
> > + .destroy = guc_context_destroy,
> > +
> > + .get_sibling = guc_virtual_get_sibling,
> > +};
> > +
> > static void sanitize_hwsp(struct intel_engine_cs *engine)
> > {
> > struct intel_timeline *tl;
> > @@ -1559,7 +1677,7 @@ int intel_guc_deregister_done_process_msg(struct intel_guc *guc,
> > } else if (context_destroyed(ce)) {
> > /* Context has been destroyed */
> > release_guc_id(guc, ce);
> > - lrc_destroy(&ce->ref);
> > + __guc_context_destroy(ce);
> > }
> > decr_outstanding_submission_g2h(guc);
> > @@ -1674,3 +1792,107 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc,
> > atomic_read(&ce->guc_sched_state_no_lock));
> > }
> > }
> > +
> > +static struct intel_context *
> > +guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
> > +{
> > + struct guc_virtual_engine *ve;
> > + struct intel_guc *guc;
> > + unsigned int n;
> > + int err;
> > +
> > + ve = kzalloc(sizeof(*ve), GFP_KERNEL);
> > + if (!ve)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + guc = &siblings[0]->gt->uc.guc;
> > +
> > + ve->base.i915 = siblings[0]->i915;
> > + ve->base.gt = siblings[0]->gt;
> > + ve->base.uncore = siblings[0]->uncore;
> > + ve->base.id = -1;
> > +
> > + ve->base.uabi_class = I915_ENGINE_CLASS_INVALID;
> > + ve->base.instance = I915_ENGINE_CLASS_INVALID_VIRTUAL;
> > + ve->base.uabi_instance = I915_ENGINE_CLASS_INVALID_VIRTUAL;
> > + ve->base.saturated = ALL_ENGINES;
> > + ve->base.breadcrumbs = intel_breadcrumbs_create(&ve->base);
> > + if (!ve->base.breadcrumbs) {
> > + kfree(ve);
> > + return ERR_PTR(-ENOMEM);
> > + }
> > +
> > + snprintf(ve->base.name, sizeof(ve->base.name), "virtual");
> > +
> > + ve->base.sched_engine = i915_sched_engine_get(guc->sched_engine);
> > +
> > + ve->base.cops = &virtual_guc_context_ops;
> > + ve->base.request_alloc = guc_request_alloc;
> > +
> > + ve->base.submit_request = guc_submit_request;
> > +
> > + ve->base.flags = I915_ENGINE_IS_VIRTUAL;
> > +
> > + intel_context_init(&ve->context, &ve->base);
> > +
> > + for (n = 0; n < count; n++) {
> > + struct intel_engine_cs *sibling = siblings[n];
> > +
> > + GEM_BUG_ON(!is_power_of_2(sibling->mask));
> > + if (sibling->mask & ve->base.mask) {
> > + DRM_DEBUG("duplicate %s entry in load balancer\n",
> > + sibling->name);
> > + err = -EINVAL;
> > + goto err_put;
> > + }
> > +
> > + ve->base.mask |= sibling->mask;
> > +
> > + if (n != 0 && ve->base.class != sibling->class) {
> > + DRM_DEBUG("invalid mixing of engine class, sibling %d, already %d\n",
> > + sibling->class, ve->base.class);
> > + err = -EINVAL;
> > + goto err_put;
> > + } else if (n == 0) {
> > + ve->base.class = sibling->class;
> > + ve->base.uabi_class = sibling->uabi_class;
> > + snprintf(ve->base.name, sizeof(ve->base.name),
> > + "v%dx%d", ve->base.class, count);
> > + ve->base.context_size = sibling->context_size;
> > +
> > + ve->base.emit_bb_start = sibling->emit_bb_start;
> > + ve->base.emit_flush = sibling->emit_flush;
> > + ve->base.emit_init_breadcrumb =
> > + sibling->emit_init_breadcrumb;
> > + ve->base.emit_fini_breadcrumb =
> > + sibling->emit_fini_breadcrumb;
> > + ve->base.emit_fini_breadcrumb_dw =
> > + sibling->emit_fini_breadcrumb_dw;
> > +
> > + ve->base.flags |= sibling->flags;
> > +
> > + ve->base.props.timeslice_duration_ms =
> > + sibling->props.timeslice_duration_ms;
> > + }
> > + }
> > +
> > + return &ve->context;
> > +
> > +err_put:
> > + intel_context_put(&ve->context);
> > + return ERR_PTR(err);
> > +}
> > +
> > +
> > +
> > +bool intel_guc_virtual_engine_has_heartbeat(const struct intel_engine_cs *ve)
> > +{
> > + struct intel_engine_cs *engine;
> > + intel_engine_mask_t tmp, mask = ve->mask;
> > +
> > + for_each_engine_masked(engine, ve->gt, mask, tmp)
> > + if (READ_ONCE(engine->props.heartbeat_interval_ms))
> > + return true;
> > +
> > + return false;
> > +}
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
> > index 2b9470c90558..5f263ac4f46a 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.h
> > @@ -26,6 +26,8 @@ void intel_guc_submission_print_info(struct intel_guc *guc,
> > void intel_guc_submission_print_context_info(struct intel_guc *guc,
> > struct drm_printer *p);
> > +bool intel_guc_virtual_engine_has_heartbeat(const struct intel_engine_cs *ve);
> > +
> > static inline bool intel_guc_submission_is_supported(struct intel_guc *guc)
> > {
> > /* XXX: GuC submission is unavailable for now */
>
