Introduce 'set parallel submit' extension to connect UAPI to GuC
multi-lrc interface. Kernel doc in new uAPI should explain it all.
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 157 +++++++++++++++++-
.../gpu/drm/i915/gem/i915_gem_context_types.h | 6 +
drivers/gpu/drm/i915/gt/intel_context_types.h | 8 +-
drivers/gpu/drm/i915/gt/intel_engine.h | 12 +-
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 6 +-
.../drm/i915/gt/intel_execlists_submission.c | 6 +-
drivers/gpu/drm/i915/gt/selftest_execlists.c | 12 +-
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 111 +++++++++++--
include/uapi/drm/i915_drm.h | 128 ++++++++++++++
9 files changed, 417 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index cff72679ad7c..2b0dd3ff4db8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -515,9 +515,149 @@ set_proto_ctx_engines_bond(struct i915_user_extension __user *base, void *data)
return 0;
}
+static int
+set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base,
+ void *data)
+{
+ struct i915_context_engines_parallel_submit __user *ext =
+ container_of_user(base, typeof(*ext), base);
+ const struct set_proto_ctx_engines *set = data;
+ struct drm_i915_private *i915 = set->i915;
+ u64 flags;
+ int err = 0, n, i, j;
+ u16 slot, width, num_siblings;
+ struct intel_engine_cs **siblings = NULL;
+ intel_engine_mask_t prev_mask;
+
+ /* Disabling for now */
+ return -ENODEV;
+
+ if (!(intel_uc_uses_guc_submission(&i915->gt.uc)))
+ return -ENODEV;
+
+ if (get_user(slot, &ext->engine_index))
+ return -EFAULT;
+
+ if (get_user(width, &ext->width))
+ return -EFAULT;
+
+ if (get_user(num_siblings, &ext->num_siblings))
+ return -EFAULT;
+
+ if (slot >= set->num_engines) {
+ drm_dbg(&i915->drm, "Invalid placement value, %d >= %d\n",
+ slot, set->num_engines);
+ return -EINVAL;
+ }
+
+ if (set->engines[slot].type != I915_GEM_ENGINE_TYPE_INVALID) {
+ drm_dbg(&i915->drm,
+ "Invalid placement[%d], already occupied\n", slot);
+ return -EINVAL;
+ }
+
+ if (get_user(flags, &ext->flags))
+ return -EFAULT;
+
+ if (flags) {
+ drm_dbg(&i915->drm, "Unknown flags 0x%02llx", flags);
+ return -EINVAL;
+ }
+
+ for (n = 0; n < ARRAY_SIZE(ext->mbz64); n++) {
+ err = check_user_mbz(&ext->mbz64[n]);
+ if (err)
+ return err;
+ }
+
+ if (width < 2) {
+ drm_dbg(&i915->drm, "Width (%d) < 2\n", width);
+ return -EINVAL;
+ }
+
+ if (num_siblings < 1) {
+ drm_dbg(&i915->drm, "Number siblings (%d) < 1\n",
+ num_siblings);
+ return -EINVAL;
+ }
+
+ siblings = kmalloc_array(num_siblings * width,
+ sizeof(*siblings),
+ GFP_KERNEL);
+ if (!siblings)
+ return -ENOMEM;
+
+ /* Create contexts / engines */
+ for (i = 0; i < width; ++i) {
+ intel_engine_mask_t current_mask = 0;
+ struct i915_engine_class_instance prev_engine;
+
+ for (j = 0; j < num_siblings; ++j) {
+ struct i915_engine_class_instance ci;
+
+ n = i * num_siblings + j;
+ if (copy_from_user(&ci, &ext->engines[n], sizeof(ci))) {
+ err = -EFAULT;
+ goto out_err;
+ }
+
+ siblings[n] =
+ intel_engine_lookup_user(i915, ci.engine_class,
+ ci.engine_instance);
+ if (!siblings[n]) {
+ drm_dbg(&i915->drm,
+ "Invalid sibling[%d]: { class:%d, inst:%d }\n",
+ n, ci.engine_class, ci.engine_instance);
+ err = -EINVAL;
+ goto out_err;
+ }
+
+ if (n) {
+ if (prev_engine.engine_class !=
+ ci.engine_class) {
+ drm_dbg(&i915->drm,
+ "Mismatched class %d, %d\n",
+ prev_engine.engine_class,
+ ci.engine_class);
+ err = -EINVAL;
+ goto out_err;
+ }
+ }
+
+ prev_engine = ci;
+ current_mask |= siblings[n]->logical_mask;
+ }
+
+ if (i > 0) {
+ if (current_mask != prev_mask << 1) {
+ drm_dbg(&i915->drm,
+ "Non contiguous logical mask 0x%x, 0x%x\n",
+ prev_mask, current_mask);
+ err = -EINVAL;
+ goto out_err;
+ }
+ }
+ prev_mask = current_mask;
+ }
+
+ set->engines[slot].type = I915_GEM_ENGINE_TYPE_PARALLEL;
+ set->engines[slot].num_siblings = num_siblings;
+ set->engines[slot].width = width;
+ set->engines[slot].siblings = siblings;
+
+ return 0;
+
+out_err:
+ kfree(siblings);
+
+ return err;
+}
+
static const i915_user_extension_fn set_proto_ctx_engines_extensions[] = {
[I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE] = set_proto_ctx_engines_balance,
[I915_CONTEXT_ENGINES_EXT_BOND] = set_proto_ctx_engines_bond,
+ [I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT] =
+ set_proto_ctx_engines_parallel_submit,
};
static int set_proto_ctx_engines(struct drm_i915_file_private *fpriv,
@@ -938,7 +1078,7 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
e = alloc_engines(num_engines);
for (n = 0; n < num_engines; n++) {
- struct intel_context *ce;
+ struct intel_context *ce, *child;
int ret;
switch (pe[n].type) {
@@ -948,7 +1088,13 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
case I915_GEM_ENGINE_TYPE_BALANCED:
ce = intel_engine_create_virtual(pe[n].siblings,
- pe[n].num_siblings);
+ pe[n].num_siblings, 0);
+ break;
+
+ case I915_GEM_ENGINE_TYPE_PARALLEL:
+ ce = intel_engine_create_parallel(pe[n].siblings,
+ pe[n].num_siblings,
+ pe[n].width);
break;
case I915_GEM_ENGINE_TYPE_INVALID:
@@ -969,6 +1115,13 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
err = ERR_PTR(ret);
goto free_engines;
}
+ for_each_child(ce, child) {
+ ret = intel_context_set_gem(child, ctx, pe->sseu);
+ if (ret) {
+ err = ERR_PTR(ret);
+ goto free_engines;
+ }
+ }
}
e->num_engines = num_engines;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index 94c03a97cb77..7b096d83bca1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -78,6 +78,9 @@ enum i915_gem_engine_type {
/** @I915_GEM_ENGINE_TYPE_BALANCED: A load-balanced engine set */
I915_GEM_ENGINE_TYPE_BALANCED,
+
+ /** @I915_GEM_ENGINE_TYPE_PARALLEL: A parallel engine set */
+ I915_GEM_ENGINE_TYPE_PARALLEL,
};
/**
@@ -108,6 +111,9 @@ struct i915_gem_proto_engine {
/** @num_siblings: Number of balanced siblings */
unsigned int num_siblings;
+ /** @width: Width of each sibling */
+ unsigned int width;
+
/** @siblings: Balanced siblings */
struct intel_engine_cs **siblings;
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
index f4fc81f64921..9cdbea752014 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -55,9 +55,13 @@ struct intel_context_ops {
void (*reset)(struct intel_context *ce);
void (*destroy)(struct kref *kref);
- /* virtual engine/context interface */
+ /* virtual/parallel engine/context interface */
struct intel_context *(*create_virtual)(struct intel_engine_cs **engine,
- unsigned int count);
+ unsigned int count,
+ unsigned long flags);
+ struct intel_context *(*create_parallel)(struct intel_engine_cs **engines,
+ unsigned int num_siblings,
+ unsigned int width);
struct intel_engine_cs *(*get_sibling)(struct intel_engine_cs *engine,
unsigned int sibling);
};
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 87579affb952..43f16a8347ee 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -279,9 +279,19 @@ intel_engine_has_preempt_reset(const struct intel_engine_cs *engine)
return intel_engine_has_preemption(engine);
}
+#define FORCE_VIRTUAL BIT(0)
struct intel_context *
intel_engine_create_virtual(struct intel_engine_cs **siblings,
- unsigned int count);
+ unsigned int count, unsigned long flags);
+
+static inline struct intel_context *
+intel_engine_create_parallel(struct intel_engine_cs **engines,
+ unsigned int num_engines,
+ unsigned int width)
+{
+ GEM_BUG_ON(!engines[0]->cops->create_parallel);
+ return engines[0]->cops->create_parallel(engines, num_engines, width);
+}
static inline bool
intel_virtual_engine_has_heartbeat(const struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 4d790f9a65dd..f66c75c77584 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1923,16 +1923,16 @@ ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine, ktime_t *now)
struct intel_context *
intel_engine_create_virtual(struct intel_engine_cs **siblings,
- unsigned int count)
+ unsigned int count, unsigned long flags)
{
if (count == 0)
return ERR_PTR(-EINVAL);
- if (count == 1)
+ if (count == 1 && !(flags & FORCE_VIRTUAL))
return intel_context_create(siblings[0]);
GEM_BUG_ON(!siblings[0]->cops->create_virtual);
- return siblings[0]->cops->create_virtual(siblings, count);
+ return siblings[0]->cops->create_virtual(siblings, count, flags);
}
struct i915_request *
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index fc74ca28f245..769480e026bb 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -201,7 +201,8 @@ static struct virtual_engine *to_virtual_engine(struct intel_engine_cs *engine)
}
static struct intel_context *
-execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count);
+execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+ unsigned long flags);
static struct i915_request *
__active_request(const struct intel_timeline * const tl,
@@ -3785,7 +3786,8 @@ static void virtual_submit_request(struct i915_request *rq)
}
static struct intel_context *
-execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
+execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+ unsigned long flags)
{
struct virtual_engine *ve;
unsigned int n;
diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
index f12ffe797639..e876a9d88a5c 100644
--- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
+++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
@@ -3733,7 +3733,7 @@ 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_engine_create_virtual(siblings, nsibling);
+ ve[n] = intel_engine_create_virtual(siblings, nsibling, 0);
if (IS_ERR(ve[n])) {
err = PTR_ERR(ve[n]);
nctx = n;
@@ -3929,7 +3929,7 @@ static int mask_virtual_engine(struct intel_gt *gt,
* restrict it to our desired engine within the virtual engine.
*/
- ve = intel_engine_create_virtual(siblings, nsibling);
+ ve = intel_engine_create_virtual(siblings, nsibling, 0);
if (IS_ERR(ve)) {
err = PTR_ERR(ve);
goto out_close;
@@ -4060,7 +4060,7 @@ static int slicein_virtual_engine(struct intel_gt *gt,
i915_request_add(rq);
}
- ce = intel_engine_create_virtual(siblings, nsibling);
+ ce = intel_engine_create_virtual(siblings, nsibling, 0);
if (IS_ERR(ce)) {
err = PTR_ERR(ce);
goto out;
@@ -4112,7 +4112,7 @@ 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_engine_create_virtual(siblings, nsibling);
+ ce = intel_engine_create_virtual(siblings, nsibling, 0);
if (IS_ERR(ce)) {
err = PTR_ERR(ce);
goto out;
@@ -4214,7 +4214,7 @@ static int preserved_virtual_engine(struct intel_gt *gt,
if (err)
goto out_scratch;
- ve = intel_engine_create_virtual(siblings, nsibling);
+ ve = intel_engine_create_virtual(siblings, nsibling, 0);
if (IS_ERR(ve)) {
err = PTR_ERR(ve);
goto out_scratch;
@@ -4354,7 +4354,7 @@ static int reset_virtual_engine(struct intel_gt *gt,
if (igt_spinner_init(&spin, gt))
return -ENOMEM;
- ve = intel_engine_create_virtual(siblings, nsibling);
+ ve = intel_engine_create_virtual(siblings, nsibling, 0);
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 44a7582c9aed..89528624710a 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -82,7 +82,8 @@
*/
static struct intel_context *
-guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count);
+guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+ unsigned long flags);
#define GUC_REQUEST_SIZE 64 /* bytes */
@@ -2514,8 +2515,6 @@ static void guc_context_post_unpin(struct intel_context *ce)
__guc_context_post_unpin(ce);
}
-/* Future patches will use this function */
-__maybe_unused
static int guc_parent_context_pre_pin(struct intel_context *ce,
struct i915_gem_ww_ctx *ww)
{
@@ -2559,8 +2558,6 @@ static int guc_parent_context_pre_pin(struct intel_context *ce,
return err;
}
-/* Future patches will use this function */
-__maybe_unused
static void guc_parent_context_post_unpin(struct intel_context *ce)
{
struct intel_context *child;
@@ -2576,8 +2573,6 @@ static void guc_parent_context_post_unpin(struct intel_context *ce)
}
}
-/* Future patches will use this function */
-__maybe_unused
static int guc_parent_context_pin(struct intel_context *ce)
{
int ret, i = 0, j = 0;
@@ -2623,8 +2618,6 @@ static int guc_parent_context_pin(struct intel_context *ce)
return ret;
}
-/* Future patches will use this function */
-__maybe_unused
static void guc_parent_context_unpin(struct intel_context *ce)
{
struct intel_context *child;
@@ -3048,8 +3041,6 @@ static void destroy_worker_func(struct work_struct *w)
intel_gt_pm_unpark_work_add(gt, destroy_worker);
}
-/* Future patches will use this function */
-__maybe_unused
static void guc_child_context_destroy(struct kref *kref)
{
__guc_context_destroy(container_of(kref, struct intel_context, ref));
@@ -3272,6 +3263,11 @@ static void remove_from_context(struct i915_request *rq)
i915_request_notify_execute_cb_imm(rq);
}
+static struct intel_context *
+guc_create_parallel(struct intel_engine_cs **engines,
+ unsigned int num_siblings,
+ unsigned int width);
+
static const struct intel_context_ops guc_context_ops = {
.alloc = guc_context_alloc,
@@ -3293,6 +3289,7 @@ static const struct intel_context_ops guc_context_ops = {
.destroy = guc_context_destroy,
.create_virtual = guc_create_virtual,
+ .create_parallel = guc_create_parallel,
};
static void __guc_signal_context_fence(struct intel_context *ce)
@@ -3782,6 +3779,91 @@ static void guc_retire_inflight_request_prio(struct i915_request *rq)
spin_unlock(&ce->guc_active.lock);
}
+static const struct intel_context_ops virtual_parent_context_ops = {
+ .alloc = guc_virtual_context_alloc,
+
+ .pre_pin = guc_parent_context_pre_pin,
+ .pin = guc_parent_context_pin,
+ .unpin = guc_parent_context_unpin,
+ .post_unpin = guc_parent_context_post_unpin,
+
+ .ban = guc_context_ban,
+
+ .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 const struct intel_context_ops virtual_child_context_ops = {
+ .alloc = guc_virtual_context_alloc,
+
+ .enter = guc_virtual_context_enter,
+ .exit = guc_virtual_context_exit,
+
+ .destroy = guc_child_context_destroy,
+};
+
+static struct intel_context *
+guc_create_parallel(struct intel_engine_cs **engines,
+ unsigned int num_siblings,
+ unsigned int width)
+{
+ struct intel_engine_cs **siblings = NULL;
+ struct intel_context *parent = NULL, *ce, *err;
+ int i, j;
+ int ret;
+
+ siblings = kmalloc_array(num_siblings,
+ sizeof(*siblings),
+ GFP_KERNEL);
+ if (!siblings)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < width; ++i) {
+ for (j = 0; j < num_siblings; ++j)
+ siblings[j] = engines[i * num_siblings + j];
+
+ ce = intel_engine_create_virtual(siblings, num_siblings,
+ FORCE_VIRTUAL);
+ if (!ce) {
+ err = ERR_PTR(-ENOMEM);
+ goto unwind;
+ }
+
+ if (i == 0) {
+ parent = ce;
+ } else {
+ intel_context_bind_parent_child(parent, ce);
+ ret = intel_context_alloc_state(ce);
+ if (ret) {
+ err = ERR_PTR(ret);
+ goto unwind;
+ }
+ }
+ }
+
+ parent->ops = &virtual_parent_context_ops;
+ for_each_child(parent, ce)
+ ce->ops = &virtual_child_context_ops;
+
+ kfree(siblings);
+ return parent;
+
+unwind:
+ if (parent) {
+ for_each_child(parent, ce)
+ intel_context_put(ce);
+ intel_context_put(parent);
+ }
+ kfree(siblings);
+ return err;
+}
+
static void sanitize_hwsp(struct intel_engine_cs *engine)
{
struct intel_timeline *tl;
@@ -4578,7 +4660,8 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc,
}
static struct intel_context *
-guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
+guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+ unsigned long flags)
{
struct guc_virtual_engine *ve;
struct intel_guc *guc;
@@ -4591,7 +4674,9 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
return ERR_PTR(-ENOMEM);
guc = &siblings[0]->gt->uc.guc;
- sched_engine = guc_to_sched_engine(guc, GUC_SUBMIT_ENGINE_SINGLE_LRC);
+ sched_engine = guc_to_sched_engine(guc, (flags & FORCE_VIRTUAL) ?
+ GUC_SUBMIT_ENGINE_MULTI_LRC :
+ GUC_SUBMIT_ENGINE_SINGLE_LRC);
ve->base.i915 = siblings[0]->i915;
ve->base.gt = siblings[0]->gt;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index ef72e07fe08c..a16f0f8908de 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1821,6 +1821,7 @@ struct drm_i915_gem_context_param {
* Extensions:
* i915_context_engines_load_balance (I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE)
* i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND)
+ * i915_context_engines_parallel_submit (I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT)
*/
#define I915_CONTEXT_PARAM_ENGINES 0xa
@@ -2046,6 +2047,132 @@ struct i915_context_engines_bond {
struct i915_engine_class_instance engines[N__]; \
} __attribute__((packed)) name__
+/**
+ * struct i915_context_engines_parallel_submit - Configure engine for
+ * parallel submission.
+ *
+ * Setup a slot in the context engine map to allow multiple BBs to be submitted
+ * in a single execbuf IOCTL. Those BBs will then be scheduled to run on the GPU
+ * in parallel. Multiple hardware contexts are created internally in the i915
+ * run these BBs. Once a slot is configured for N BBs only N BBs can be
+ * submitted in each execbuf IOCTL and this is implicit behavior e.g. The user
+ * doesn't tell the execbuf IOCTL there are N BBs, the execbuf IOCTL knows how
+ * many BBs there are based on the slot's configuration. The N BBs are the last
+ * N buffer objects or first N if I915_EXEC_BATCH_FIRST is set.
+ *
+ * The default placement behavior is to create implicit bonds between each
+ * context if each context maps to more than 1 physical engine (e.g. context is
+ * a virtual engine). Also we only allow contexts of same engine class and these
+ * contexts must be in logically contiguous order. Examples of the placement
+ * behavior described below. Lastly, the default is to not allow BBs to
+ * preempted mid BB rather insert coordinated preemption on all hardware
+ * contexts between each set of BBs. Flags may be added in the future to change
+ * both of these default behaviors.
+ *
+ * Returns -EINVAL if hardware context placement configuration is invalid or if
+ * the placement configuration isn't supported on the platform / submission
+ * interface.
+ * Returns -ENODEV if extension isn't supported on the platform / submission
+ * interface.
+ *
+ * .. code-block:: none
+ *
+ * Example 1 pseudo code:
+ * CS[X] = generic engine of same class, logical instance X
+ * INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE
+ * set_engines(INVALID)
+ * set_parallel(engine_index=0, width=2, num_siblings=1,
+ * engines=CS[0],CS[1])
+ *
+ * Results in the following valid placement:
+ * CS[0], CS[1]
+ *
+ * Example 2 pseudo code:
+ * CS[X] = generic engine of same class, logical instance X
+ * INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE
+ * set_engines(INVALID)
+ * set_parallel(engine_index=0, width=2, num_siblings=2,
+ * engines=CS[0],CS[2],CS[1],CS[3])
+ *
+ * Results in the following valid placements:
+ * CS[0], CS[1]
+ * CS[2], CS[3]
+ *
+ * This can also be thought of as 2 virtual engines described by 2-D array
+ * in the engines the field with bonds placed between each index of the
+ * virtual engines. e.g. CS[0] is bonded to CS[1], CS[2] is bonded to
+ * CS[3].
+ * VE[0] = CS[0], CS[2]
+ * VE[1] = CS[1], CS[3]
+ *
+ * Example 3 pseudo code:
+ * CS[X] = generic engine of same class, logical instance X
+ * INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE
+ * set_engines(INVALID)
+ * set_parallel(engine_index=0, width=2, num_siblings=2,
+ * engines=CS[0],CS[1],CS[1],CS[3])
+ *
+ * Results in the following valid and invalid placements:
+ * CS[0], CS[1]
+ * CS[1], CS[3] - Not logical contiguous, return -EINVAL
+ */
+struct i915_context_engines_parallel_submit {
+ /**
+ * @base: base user extension.
+ */
+ struct i915_user_extension base;
+
+ /**
+ * @engine_index: slot for parallel engine
+ */
+ __u16 engine_index;
+
+ /**
+ * @width: number of contexts per parallel engine
+ */
+ __u16 width;
+
+ /**
+ * @num_siblings: number of siblings per context
+ */
+ __u16 num_siblings;
+
+ /**
+ * @mbz16: reserved for future use; must be zero
+ */
+ __u16 mbz16;
+
+ /**
+ * @flags: all undefined flags must be zero, currently not defined flags
+ */
+ __u64 flags;
+
+ /**
+ * @mbz64: reserved for future use; must be zero
+ */
+ __u64 mbz64[3];
+
+ /**
+ * @engines: 2-d array of engine instances to configure parallel engine
+ *
+ * length = width (i) * num_siblings (j)
+ * index = j + i * num_siblings
+ */
+ struct i915_engine_class_instance engines[0];
+
+} __packed;
+
+#define I915_DEFINE_CONTEXT_ENGINES_PARALLEL_SUBMIT(name__, N__) struct { \
+ struct i915_user_extension base; \
+ __u16 engine_index; \
+ __u16 width; \
+ __u16 num_siblings; \
+ __u16 mbz16; \
+ __u64 flags; \
+ __u64 mbz64[3]; \
+ struct i915_engine_class_instance engines[N__]; \
+} __attribute__((packed)) name__
+
/**
* DOC: Context Engine Map uAPI
*
@@ -2105,6 +2232,7 @@ struct i915_context_param_engines {
__u64 extensions; /* linked chain of extension blocks, 0 terminates */
#define I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE 0 /* see i915_context_engines_load_balance */
#define I915_CONTEXT_ENGINES_EXT_BOND 1 /* see i915_context_engines_bond */
+#define I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT 2 /* see i915_context_engines_parallel_submit */
struct i915_engine_class_instance engines[0];
} __attribute__((packed));
--
2.28.0
