This enables userspace to discover the engines available on the GPU.
Here is the layout on a Skylake GT4:
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/gt
├── bcs
│ └── 0
│ ├── capabilities
│ ├── class
│ └── id
├── rcs
│ └── 0
│ ├── capabilities
│ ├── class
│ └── id
├── vcs
│ ├── 0
│ │ ├── capabilities
│ │ │ └── hevc
│ │ ├── class
│ │ └── id
│ └── 1
│ ├── capabilities
│ ├── class
│ └── id
└── vecs
└── 0
├── capabilities
├── class
└── id
Further capabilities can be added later as attributes of each engine.
v2: Add capabilities sub directory (Tvrtko)
Move engines directory to drm/card/gt (Chris)
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 5 +
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/i915_sysfs.c | 160 ++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_engine_cs.c | 12 +++
drivers/gpu/drm/i915/intel_ringbuffer.h | 4 +
5 files changed, 182 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f8d239d8bfab..22ac96d2ef42 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2729,6 +2729,11 @@ struct drm_i915_private {
} oa;
} perf;
+ struct {
+ struct kobject kobj;
+ struct kobject classes_kobjs[MAX_ENGINE_CLASS];
+ } gt_topology;
+
/* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
struct {
void (*resume)(struct drm_i915_private *);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 107e2d7c9fba..5d1ef1314547 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -186,6 +186,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define VIDEO_ENHANCEMENT_CLASS 2
#define COPY_ENGINE_CLASS 3
#define OTHER_CLASS 4
+#define MAX_ENGINE_CLASS 5
/* PCI config space */
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index 791759f632e1..fd04d0b93eaf 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -559,6 +559,160 @@ static void i915_setup_error_capture(struct device *kdev) {}
static void i915_teardown_error_capture(struct device *kdev) {}
#endif
+static struct attribute engine_id_attr = {
+ .name = "id",
+ .mode = 0444,
+};
+
+static struct attribute engine_class_attr = {
+ .name = "class",
+ .mode = 0444,
+};
+
+static ssize_t
+show_engine_attr(struct kobject *kobj, struct attribute *attr, char *buf)
+{
+ struct intel_engine_cs *engine =
+ container_of(kobj, struct intel_engine_cs, instance_kobj);
+
+ if (attr == &engine_id_attr)
+ return sprintf(buf, "%hhu\n", engine->uabi_id);
+ if (attr == &engine_class_attr)
+ return sprintf(buf, "%hhu\n", engine->uabi_class);
+ return sprintf(buf, "\n");
+}
+
+static const struct sysfs_ops engine_ops = {
+ .show = show_engine_attr,
+};
+
+static struct kobj_type engine_type = {
+ .sysfs_ops = &engine_ops,
+};
+
+static struct attribute engine_capability_hevc_attr = {
+ .name = "hevc",
+ .mode = 0444,
+};
+
+static ssize_t
+show_engine_capabilities_attr(struct kobject *kobj, struct attribute *attr, char *buf)
+{
+ struct intel_engine_cs *engine =
+ container_of(kobj, struct intel_engine_cs, capabilities_kobj);
+
+ if (attr == &engine_capability_hevc_attr)
+ return sprintf(buf, "%i\n", INTEL_GEN(engine->i915) >= 8);
+ return sprintf(buf, "\n");
+}
+
+static const struct sysfs_ops engine_capabilities_ops = {
+ .show = show_engine_capabilities_attr,
+};
+
+static struct kobj_type engine_capabilities_type = {
+ .sysfs_ops = &engine_capabilities_ops,
+};
+
+static int i915_setup_engines_sysfs(struct drm_i915_private *dev_priv,
+ struct kobject *gt_kobj)
+{
+ struct intel_engine_cs *engine_for_class, *engine;
+ enum intel_engine_id id_for_class, id;
+ bool registred[MAX_ENGINE_CLASS] = { false, };
+ int ret;
+
+ for_each_engine(engine_for_class, dev_priv, id_for_class) {
+ struct kobject *engine_class_kobj =
+ &dev_priv->gt_topology.classes_kobjs[engine_for_class->class];
+
+ if (registred[engine_for_class->class])
+ continue;
+
+ registred[engine_for_class->class] = true;
+
+ ret = kobject_init_and_add(engine_class_kobj,
+ gt_kobj->ktype,
+ gt_kobj,
+ intel_engine_get_class_name(engine_for_class));
+ if (ret)
+ return ret;
+
+ for_each_engine(engine, dev_priv, id) {
+ if (engine->class != engine_for_class->class)
+ continue;
+
+ ret = kobject_init_and_add(&engine->instance_kobj,
+ &engine_type,
+ engine_class_kobj,
+ "%d", engine->instance);
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_file(&engine->instance_kobj,
+ &engine_id_attr);
+ if (ret)
+ return ret;
+ ret = sysfs_create_file(&engine->instance_kobj,
+ &engine_class_attr);
+ if (ret)
+ return ret;
+
+ ret = kobject_init_and_add(&engine->capabilities_kobj,
+ &engine_capabilities_type,
+ &engine->instance_kobj,
+ "capabilities");
+ if (ret)
+ return ret;
+
+ if (engine->id == VCS) {
+ ret = sysfs_create_file(&engine->capabilities_kobj,
+ &engine_capability_hevc_attr);
+ if (ret)
+ return ret;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static void i915_teardown_engines_sysfs(struct drm_i915_private *dev_priv)
+{
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ for_each_engine(engine, dev_priv, id) {
+ sysfs_remove_file(&engine->instance_kobj, &engine_id_attr);
+ sysfs_remove_file(&engine->instance_kobj, &engine_class_attr);
+ sysfs_remove_file(&engine->capabilities_kobj,
+ &engine_capability_hevc_attr);
+ }
+}
+
+static int i915_setup_gt_sysfs(struct drm_i915_private *dev_priv,
+ struct device *kdev)
+{
+ int ret;
+
+ ret = kobject_init_and_add(&dev_priv->gt_topology.kobj,
+ kdev->kobj.ktype,
+ &kdev->kobj,
+ "gt");
+ if (ret)
+ return ret;
+
+ return i915_setup_engines_sysfs(dev_priv, &dev_priv->gt_topology.kobj);
+}
+
+static void i915_teardown_gt_sysfs(struct drm_i915_private *dev_priv)
+{
+ i915_teardown_engines_sysfs(dev_priv);
+
+ kobject_get(&dev_priv->gt_topology.kobj);
+ kobject_del(&dev_priv->gt_topology.kobj);
+}
+
void i915_setup_sysfs(struct drm_i915_private *dev_priv)
{
struct device *kdev = dev_priv->drm.primary->kdev;
@@ -605,6 +759,10 @@ void i915_setup_sysfs(struct drm_i915_private *dev_priv)
if (ret)
DRM_ERROR("RPS sysfs setup failed\n");
+ ret = i915_setup_gt_sysfs(dev_priv, kdev);
+ if (ret)
+ DRM_ERROR("GT sysfs setup failed\n");
+
i915_setup_error_capture(kdev);
}
@@ -614,6 +772,8 @@ void i915_teardown_sysfs(struct drm_i915_private *dev_priv)
i915_teardown_error_capture(kdev);
+ i915_teardown_gt_sysfs(dev_priv);
+
if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
sysfs_remove_files(&kdev->kobj, vlv_attrs);
else
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 9897c7f78c51..9d82dfbb45db 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -133,6 +133,18 @@ static const struct engine_info intel_engines[] = {
},
};
+/**
+ * intel_engine_get_class_name() - return the name of the class for an engine
+ * @engine: engine
+ *
+ * Return: a string naming the class of the engine
+ */
+const char *
+intel_engine_get_class_name(struct intel_engine_cs *engine)
+{
+ return intel_engine_classes[engine->class].name;
+}
+
/**
* ___intel_engine_context_size() - return the size of the context for an engine
* @dev_priv: i915 device private
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 5f96533e5341..eca6c87a1e06 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -290,6 +290,9 @@ struct intel_engine_cs {
struct drm_i915_private *i915;
char name[INTEL_ENGINE_CS_MAX_NAME];
+ struct kobject instance_kobj;
+ struct kobject capabilities_kobj;
+
enum intel_engine_id id;
unsigned int hw_id;
unsigned int guc_id;
@@ -924,6 +927,7 @@ gen8_emit_ggtt_write(u32 *cs, u32 value, u32 gtt_offset)
return cs;
}
+const char *intel_engine_get_class_name(struct intel_engine_cs *engine);
bool intel_engine_is_idle(struct intel_engine_cs *engine);
bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
--
2.15.0
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