[Intel-gfx] [PATCH 05/26] drm/i915: Add logical engine mapping

Matthew Brost
2021-10-04T22:11:55Z

Add logical engine mapping. This is required for split-frame, as
workloads need to be placed on engines in a logically contiguous manner.

v2:
(Daniel Vetter)
- Add kernel doc for new fields
v3
(Tvrtko)
- Update comment for new logical_mask field

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 60 ++++++++++++++++---
drivers/gpu/drm/i915/gt/intel_engine_types.h | 7 +++
.../drm/i915/gt/intel_execlists_submission.c | 1 +
drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c | 2 +-
.../gpu/drm/i915/gt/uc/intel_guc_submission.c | 21 +------
5 files changed, 62 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 2ae57e4656a3..2eb798ad068b 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -290,7 +290,8 @@ static void nop_irq_handler(struct intel_engine_cs *engine, u16 iir)
GEM_DEBUG_WARN_ON(iir);
}

-static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)
+static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id,
+ u8 logical_instance)
{
const struct engine_info *info = &intel_engines[id];
struct drm_i915_private *i915 = gt->i915;
@@ -335,6 +336,7 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)

engine->class = info->class;
engine->instance = info->instance;
+ engine->logical_mask = BIT(logical_instance);
__sprint_engine_name(engine);

engine->props.heartbeat_interval_ms =
@@ -588,6 +590,37 @@ static intel_engine_mask_t init_engine_mask(struct intel_gt *gt)
return info->engine_mask;
}

+static void populate_logical_ids(struct intel_gt *gt, u8 *logical_ids,
+ u8 class, const u8 *map, u8 num_instances)
+{
+ int i, j;
+ u8 current_logical_id = 0;
+
+ for (j = 0; j < num_instances; ++j) {
+ for (i = 0; i < ARRAY_SIZE(intel_engines); ++i) {
+ if (!HAS_ENGINE(gt, i) ||
+ intel_engines[i].class != class)
+ continue;
+
+ if (intel_engines[i].instance == map[j]) {
+ logical_ids[intel_engines[i].instance] =
+ current_logical_id++;
+ break;
+ }
+ }
+ }
+}
+
+static void setup_logical_ids(struct intel_gt *gt, u8 *logical_ids, u8 class)
+{
+ int i;
+ u8 map[MAX_ENGINE_INSTANCE + 1];
+
+ for (i = 0; i < MAX_ENGINE_INSTANCE + 1; ++i)
+ map[i] = i;
+ populate_logical_ids(gt, logical_ids, class, map, ARRAY_SIZE(map));
+}
+
/**
* intel_engines_init_mmio() - allocate and prepare the Engine Command Streamers
* @gt: pointer to struct intel_gt
@@ -599,7 +632,8 @@ int intel_engines_init_mmio(struct intel_gt *gt)
struct drm_i915_private *i915 = gt->i915;
const unsigned int engine_mask = init_engine_mask(gt);
unsigned int mask = 0;
- unsigned int i;
+ unsigned int i, class;
+ u8 logical_ids[MAX_ENGINE_INSTANCE + 1];
int err;

drm_WARN_ON(&i915->drm, engine_mask == 0);
@@ -609,15 +643,23 @@ int intel_engines_init_mmio(struct intel_gt *gt)
if (i915_inject_probe_failure(i915))
return -ENODEV;

- for (i = 0; i < ARRAY_SIZE(intel_engines); i++) {
- if (!HAS_ENGINE(gt, i))
- continue;
+ for (class = 0; class < MAX_ENGINE_CLASS + 1; ++class) {
+ setup_logical_ids(gt, logical_ids, class);

- err = intel_engine_setup(gt, i);
- if (err)
- goto cleanup;
+ for (i = 0; i < ARRAY_SIZE(intel_engines); ++i) {
+ u8 instance = intel_engines[i].instance;
+
+ if (intel_engines[i].class != class ||
+ !HAS_ENGINE(gt, i))
+ continue;

- mask |= BIT(i);
+ err = intel_engine_setup(gt, i,
+ logical_ids[instance]);
+ if (err)
+ goto cleanup;
+
+ mask |= BIT(i);
+ }
}

/*
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 5ae1207c363b..68010da468a4 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -269,6 +269,13 @@ struct intel_engine_cs {
unsigned int guc_id;

intel_engine_mask_t mask;
+ /**
+ * @logical_mask: logical mask of engine, reported to user space via
+ * query IOCTL and used to communicate with the GuC in logical space.
+ * The logical instance of a physical engine can change based on product
+ * / fusing and defined in the bspec.
+ */
+ intel_engine_mask_t logical_mask;

u8 class;
u8 instance;
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 7147fe80919e..5ed1e222c308 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -3877,6 +3877,7 @@ execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count)

ve->siblings[ve->num_siblings++] = sibling;
ve->base.mask |= sibling->mask;
+ ve->base.logical_mask |= sibling->logical_mask;

/*
* All physical engines must be compatible for their emission
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
index 2c6ea64af7ec..621c893a009f 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
@@ -176,7 +176,7 @@ static void guc_mapping_table_init(struct intel_gt *gt,
for_each_engine(engine, gt, id) {
u8 guc_class = engine_class_to_guc_class(engine->class);

- system_info->mapping_table[guc_class][engine->instance] =
+ system_info->mapping_table[guc_class][ilog2(engine->logical_mask)] =
engine->instance;
}
}
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 8b82da50c2bc..451d9ae861a6 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -1423,23 +1423,6 @@ static int deregister_context(struct intel_context *ce, u32 guc_id)
return __guc_action_deregister_context(guc, guc_id);
}

-static intel_engine_mask_t adjust_engine_mask(u8 class, intel_engine_mask_t mask)
-{
- switch (class) {
- case RENDER_CLASS:
- return mask >> RCS0;
- case VIDEO_ENHANCEMENT_CLASS:
- return mask >> VECS0;
- case VIDEO_DECODE_CLASS:
- return mask >> VCS0;
- case COPY_ENGINE_CLASS:
- return mask >> BCS0;
- default:
- MISSING_CASE(class);
- return 0;
- }
-}
-
static void guc_context_policy_init(struct intel_engine_cs *engine,
struct guc_lrc_desc *desc)
{
@@ -1481,8 +1464,7 @@ static int guc_lrc_desc_pin(struct intel_context *ce, bool loop)

desc = __get_lrc_desc(guc, desc_idx);
desc->engine_class = engine_class_to_guc_class(engine->class);
- desc->engine_submit_mask = adjust_engine_mask(engine->class,
- engine->mask);
+ desc->engine_submit_mask = engine->logical_mask;
desc->hw_context_desc = ce->lrc.lrca;
desc->priority = ce->guc_state.prio;
desc->context_flags = CONTEXT_REGISTRATION_FLAG_KMD;
@@ -3271,6 +3253,7 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
}

ve->base.mask |= sibling->mask;
+ ve->base.logical_mask |= sibling->logical_mask;

if (n != 0 && ve->base.class != sibling->class) {
DRM_DEBUG("invalid mixing of engine class, sibling %d, already %d\n",
--
2.32.0