// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include <linux/list.h>
#include <linux/list_sort.h>
#include <linux/llist.h>
#include "i915_drv.h"
#include "intel_engine.h"
#include "intel_engine_user.h"
#include "intel_gt.h"
#include "uc/intel_guc_submission.h"
struct intel_engine_cs *
intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance)
{
struct rb_node *p = i915->uabi_engines.rb_node;
while (p) {
struct intel_engine_cs *it =
rb_entry(p, typeof(*it), uabi_node);
if (class < it->uabi_class)
p = p->rb_left;
else if (class > it->uabi_class ||
instance > it->uabi_instance)
p = p->rb_right;
else if (instance < it->uabi_instance)
p = p->rb_left;
else
return it;
}
return NULL;
}
void intel_engine_add_user(struct intel_engine_cs *engine)
{
llist_add(&engine->uabi_llist, &engine->i915->uabi_engines_llist);
}
#define I915_NO_UABI_CLASS ((u16)(-1))
static const u16 uabi_classes[] = {
[RENDER_CLASS] = I915_ENGINE_CLASS_RENDER,
[COPY_ENGINE_CLASS] = I915_ENGINE_CLASS_COPY,
[VIDEO_DECODE_CLASS] = I915_ENGINE_CLASS_VIDEO,
[VIDEO_ENHANCEMENT_CLASS] = I915_ENGINE_CLASS_VIDEO_ENHANCE,
[COMPUTE_CLASS] = I915_ENGINE_CLASS_COMPUTE,
[OTHER_CLASS] = I915_NO_UABI_CLASS, /* Not exposed to users, no uabi class. */
};
static int engine_cmp(void *priv, const struct list_head *A,
const struct list_head *B)
{
const struct intel_engine_cs *a =
container_of(A, typeof(*a), uabi_list);
const struct intel_engine_cs *b =
container_of(B, typeof(*b), uabi_list);
if (uabi_classes[a->class] < uabi_classes[b->class])
return -1;
if (uabi_classes[a->class] > uabi_classes[b->class])
return 1;
if (a->instance < b->instance)
return -1;
if (a->instance > b->instance)
return 1;
return 0;
}
static struct llist_node *get_engines(struct drm_i915_private *i915)
{
return llist_del_all(&i915->uabi_engines_llist);
}
static void sort_engines(struct drm_i915_private *i915,
struct list_head *engines)
{
struct llist_node *pos, *next;
llist_for_each_safe(pos, next, get_engines(i915)) {
struct intel_engine_cs *engine =
container_of(pos, typeof(*engine), uabi_llist);
list_add(&engine->uabi_list, engines);
}
list_sort(NULL, engines, engine_cmp);
}
static void set_scheduler_caps(struct drm_i915_private *i915)
{
static const struct {
u8 engine;
u8 sched;
} map[] = {
#define MAP(x, y) { ilog2(I915_ENGINE_##x), ilog2(I915_SCHEDULER_CAP_##y) }
MAP(HAS_PREEMPTION, PREEMPTION),
MAP(HAS_SEMAPHORES, SEMAPHORES),
MAP(SUPPORTS_STATS, ENGINE_BUSY_STATS),
#undef MAP
};
struct intel_engine_cs *engine;
u32 enabled, disabled;
enabled = 0;
disabled = 0;
for_each_uabi_engine(engine, i915) { /* all engines must agree! */
int i;
if (engine->sched_engine->schedule)
enabled |= (I915_SCHEDULER_CAP_ENABLED |
I915_SCHEDULER_CAP_PRIORITY);
else
disabled |= (I915_SCHEDULER_CAP_ENABLED |
I915_SCHEDULER_CAP_PRIORITY);
if (intel_uc_uses_guc_submission(&engine->gt->uc))
enabled |= I915_SCHEDULER_CAP_STATIC_PRIORITY_MAP;
for (i = 0; i < ARRAY_SIZE(map); i++) {
if (engine->flags & BIT(map[i].engine))
enabled |= BIT(map[i].sched);
else
disabled |= BIT(map[i].sched);
}
}
i915->caps.scheduler = enabled & ~disabled;
if (!(i915->caps.scheduler & I915_SCHEDULER_CAP_ENABLED))
i915->caps.scheduler = 0;
}
const char *intel_engine_class_repr(u8 class)
{
static const char * const uabi_names[] = {
[RENDER_CLASS] = "rcs",
[COPY_ENGINE_CLASS] = "bcs",
[VIDEO_DECODE_CLASS] = "vcs",
[VIDEO_ENHANCEMENT_CLASS] = "vecs",
[OTHER_CLASS] = "other",
[COMPUTE_CLASS] = "ccs",
};
if (class >= ARRAY_SIZE(uabi_names) || !uabi_names[class])
return "xxx";
return uabi_names[class];
}
struct legacy_ring {
struct intel_gt *gt;
u8 class;
u8 instance;
};
static int legacy_ring_idx(const struct legacy_ring *ring)
{
static const struct {
u8 base, max;
} map[] = {
[RENDER_CLASS] = { RCS0, 1 },
[COPY_ENGINE_CLASS] = { BCS0, 1 },
[VIDEO_DECODE_CLASS] = { VCS0, I915_MAX_VCS },
[VIDEO_ENHANCEMENT_CLASS] = { VECS0, I915_MAX_VECS },
[COMPUTE_CLASS] = { CCS0, I915_MAX_CCS },
};
if (GEM_DEBUG_WARN_ON(ring->class >= ARRAY_SIZE(map)))
return INVALID_ENGINE;
if (GEM_DEBUG_WARN_ON(ring->instance >= map[ring->class].max))
return INVALID_ENGINE;
return map[ring->class].base + ring->instance;
}
static void add_legacy_ring(struct legacy_ring *ring,
struct intel_engine_cs *engine)
{
if (engine->gt != ring->gt || engine->class != ring->class) {
ring->gt = engine->gt;
ring->class = engine->class;
ring->instance = 0;
}
engine->legacy_idx = legacy_ring_idx(ring);
if (engine->legacy_idx != INVALID_ENGINE)
ring->instance++;
}
static void engine_rename(struct intel_engine_cs *engine, const char *name, u16 instance)
{
char old[sizeof(engine->name)];
memcpy(old, engine->name, sizeof(engine->name));
scnprintf(engine->name, sizeof(engine->name), "%s%u", name, instance);
drm_dbg(&engine->i915->drm, "renamed %s to %s\n", old, engine->name);
}
void intel_engines_driver_register(struct drm_i915_private *i915)
{
u16 name_instance, other_instance = 0;
struct legacy_ring ring = {};
struct list_head *it, *next;
struct rb_node **p, *prev;
LIST_HEAD(engines);
sort_engines(i915, &engines);
prev = NULL;
p = &i915->uabi_engines.rb_node;
list_for_each_safe(it, next, &engines) {
struct intel_engine_cs *engine =
container_of(it, typeof(*engine), uabi_list);
if (intel_gt_has_unrecoverable_error(engine->gt))
continue; /* ignore incomplete engines */
GEM_BUG_ON(engine->class >= ARRAY_SIZE(uabi_classes));
engine->uabi_class = uabi_classes[engine->class];
if (engine->uabi_class == I915_NO_UABI_CLASS) {
name_instance = other_instance++;
} else {
GEM_BUG_ON(engine->uabi_class >=
ARRAY_SIZE(i915->engine_uabi_class_count));
name_instance =
i915->engine_uabi_class_count[engine->uabi_class]++;
}
engine->uabi_instance = name_instance;
/*
* Replace the internal name with the final user and log facing
* name.
*/
engine_rename(engine,
intel_engine_class_repr(engine->class),
name_instance);
if (engine->uabi_class == I915_NO_UABI_CLASS)
continue;
rb_link_node(&engine->uabi_node, prev, p);
rb_insert_color(&engine->uabi_node, &i915->uabi_engines);
GEM_BUG_ON(intel_engine_lookup_user(i915,
engine->uabi_class,
engine->uabi_instance) != engine);
/* Fix up the mapping to match default execbuf::user_map[] */
add_legacy_ring(&ring, engine);
prev = &engine->uabi_node;
p = &prev->rb_right;
}
if (IS_ENABLED(CONFIG_DRM_I915_SELFTESTS) &&
IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) {
struct intel_engine_cs *engine;
unsigned int isolation;
int class, inst;
int errors = 0;
for (class = 0; class < ARRAY_SIZE(i915->engine_uabi_class_count); class++) {
for (inst = 0; inst < i915->engine_uabi_class_count[class]; inst++) {
engine = intel_engine_lookup_user(i915,
class, inst);
if (!engine) {
pr_err("UABI engine not found for { class:%d, instance:%d }\n",
class, inst);
errors++;
continue;
}
if (engine->uabi_class != class ||
engine->uabi_instance != inst) {
pr_err("Wrong UABI engine:%s { class:%d, instance:%d } found for { class:%d, instance:%d }\n",
engine->name,
engine->uabi_class,
engine->uabi_instance,
class, inst);
errors++;
continue;
}
}
}
/*
* Make sure that classes with multiple engine instances all
* share the same basic configuration.
*/
isolation = intel_engines_has_context_isolation(i915);
for_each_uabi_engine(engine, i915) {
unsigned int bit = BIT(engine->uabi_class);
unsigned int expected = engine->default_state ? bit : 0;
if ((isolation & bit) != expected) {
pr_err("mismatching default context state for class %d on engine %s\n",
engine->uabi_class, engine->name);
errors++;
}
}
if (drm_WARN(&i915->drm, errors,
"Invalid UABI engine mapping found"))
i915->uabi_engines = RB_ROOT;
}
set_scheduler_caps(i915);
}
unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915)
{
struct intel_engine_cs *engine;
unsigned int which;
which = 0;
for_each_uabi_engine(engine, i915)
if (engine->default_state)
which |= BIT(engine->uabi_class);
return which;
}
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