On 12/22/2021 14:35, Matthew Brost wrote:

A weak implementation of parallel submission (multi-bb execbuf IOCTL) for execlists. Doing as little as possible to support this interface for execlists - basically just passing submit fences between each request generated and virtual engines are not allowed. This is on par with what is there for the existing (hopefully soon deprecated) bonding interface.

We perma-pin these execlists contexts to align with GuC implementation.

v2: (John Harrison)

• Drop siblings array as num_siblings must be 1

v3: (John Harrison)

• Drop single submission

v4: (John Harrison)

• Actually drop single submission
• Use IS_ERR check on return value from intel_context_create
• Set last request to NULL on unpin

Signed-off-by: Matthew Brost matthew.brost@intel.com

drivers/gpu/drm/i915/gem/i915_gem_context.c | 11 ++++-- drivers/gpu/drm/i915/gt/intel_context.c | 4 +- .../drm/i915/gt/intel_execlists_submission.c | 38 +++++++++++++++++++ drivers/gpu/drm/i915/gt/intel_lrc.c | 4 ++ .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 2 - 5 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c index cad3f0b2be9e..b0d2d81fc3b3 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c @@ -570,10 +570,6 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base, struct intel_engine_cs **siblings = NULL; intel_engine_mask_t prev_mask;

• /* FIXME: This is NIY for execlists */
• if (!(intel_uc_uses_guc_submission(&to_gt(i915)->uc)))

• return -ENODEV;
  

• if (get_user(slot, &ext->engine_index)) return -EFAULT;

@@ -583,6 +579,13 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base, if (get_user(num_siblings, &ext->num_siblings)) return -EFAULT;

• if (!intel_uc_uses_guc_submission(&to_gt(i915)->uc) &&

•    num_siblings != 1) {
  

• drm_dbg(&i915->drm, "Only 1 sibling (%d) supported in non-GuC mode\n",
  

• 	num_siblings);
  

• return -EINVAL;
  

• }
• if (slot >= set->num_engines) { drm_dbg(&i915->drm, "Invalid placement value, %d >= %d\n", slot, set->num_engines);

diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c index ba083d800a08..5d0ec7c49b6a 100644 --- a/drivers/gpu/drm/i915/gt/intel_context.c +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -79,7 +79,8 @@ static int intel_context_active_acquire(struct intel_context *ce)

__i915_active_acquire(&ce->active);

• if (intel_context_is_barrier(ce) || intel_engine_uses_guc(ce->engine))

• if (intel_context_is_barrier(ce) || intel_engine_uses_guc(ce->engine) ||

•    intel_context_is_parallel(ce))
  

  return 0;

  /* Preallocate tracking nodes */

@@ -563,7 +564,6 @@ void intel_context_bind_parent_child(struct intel_context *parent, * Callers responsibility to validate that this function is used * correctly but we use GEM_BUG_ON here ensure that they do. */

• GEM_BUG_ON(!intel_engine_uses_guc(parent->engine)); GEM_BUG_ON(intel_context_is_pinned(parent)); GEM_BUG_ON(intel_context_is_child(parent)); GEM_BUG_ON(intel_context_is_pinned(child));

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c index a69df5e9e77a..be56d0b41892 100644 --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c @@ -2599,6 +2599,43 @@ static void execlists_context_cancel_request(struct intel_context *ce, current->comm); }

+static struct intel_context * +execlists_create_parallel(struct intel_engine_cs **engines,

• 	  unsigned int num_siblings,
  

• 	  unsigned int width)
  

+{

• struct intel_context *parent = NULL, *ce, *err;
• int i;
• GEM_BUG_ON(num_siblings != 1);
• for (i = 0; i < width; ++i) {

• ce = intel_context_create(engines[i]);
  

• if (IS_ERR(ce)) {
  

• 	err = ce;
  

Could get rid of 'err' and just say 'return ce;' at the end of 'unwind:'.

Either way: Reviewed-by: John Harrison John.C.Harrison@Intel.com

• 	goto unwind;
  

• }
  

• if (i == 0)
  

• 	parent = ce;
  

• else
  

• 	intel_context_bind_parent_child(parent, ce);
  

• }
• parent->parallel.fence_context = dma_fence_context_alloc(1);
• intel_context_set_nopreempt(parent);
• for_each_child(parent, ce)

• intel_context_set_nopreempt(ce);
  

• return parent;

+unwind:

• if (parent)

• intel_context_put(parent);
  

• return err;

+}

• static const struct intel_context_ops execlists_context_ops = { .flags = COPS_HAS_INFLIGHT,

@@ -2617,6 +2654,7 @@ static const struct intel_context_ops execlists_context_ops = { .reset = lrc_reset, .destroy = lrc_destroy,

• .create_parallel = execlists_create_parallel, .create_virtual = execlists_create_virtual, };

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index b3489599e4de..84456ffeb4cd 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -1065,6 +1065,10 @@ lrc_pin(struct intel_context *ce,

void lrc_unpin(struct intel_context *ce) {

• if (unlikely(ce->parallel.last_rq)) {

• i915_request_put(ce->parallel.last_rq);
  

• ce->parallel.last_rq = NULL;
  

• } check_redzone((void *)ce->lrc_reg_state - LRC_STATE_OFFSET, ce->engine); }

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 e7517206af82..0a03a30e4c6d 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -3248,8 +3248,6 @@ static void guc_parent_context_unpin(struct intel_context *ce) GEM_BUG_ON(!intel_context_is_parent(ce)); GEM_BUG_ON(!intel_engine_is_virtual(ce->engine));

• if (ce->parallel.last_rq)

• i915_request_put(ce->parallel.last_rq);
  

  unpin_guc_id(guc, ce); lrc_unpin(ce); }