drivers/gpu/drm/i915/gt/selftest_ring_submission.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/gt/selftest_ring_submission.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/gt/selftest_ring_submission.c
Extension
.c
Size
6152 bytes
Lines
300
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (err || READ_ONCE(*result)) {
			if (!err) {
				pr_err("pass[%d] wa_bb emitted for the kernel context\n",
				       pass);
				err = -EINVAL;
			}
			return err;
		}

		WRITE_ONCE(*result, 0);
		err = new_context_sync(engine);
		if (READ_ONCE(*result) != STACK_MAGIC) {
			if (!err) {
				pr_err("pass[%d] wa_bb *NOT* emitted after the kernel context\n",
				       pass);
				err = -EINVAL;
			}
			return err;
		}

		WRITE_ONCE(*result, 0);
		err = new_context_sync(engine);
		if (READ_ONCE(*result) != STACK_MAGIC) {
			if (!err) {
				pr_err("pass[%d] wa_bb *NOT* emitted for the user context switch\n",
				       pass);
				err = -EINVAL;
			}
			return err;
		}
	}

	return 0;
}

static int double_context_sync_00(struct intel_engine_cs *engine, u32 *result)
{
	struct intel_context *ce;
	int err, i;

	ce = intel_context_create(engine);
	if (IS_ERR(ce))
		return PTR_ERR(ce);

	for (i = 0; i < 2; i++) {
		WRITE_ONCE(*result, 0);
		err = context_sync(ce);
		if (err)
			break;
	}
	intel_context_put(ce);
	if (err)
		return err;

	if (READ_ONCE(*result)) {
		pr_err("wa_bb emitted between the same user context\n");
		return -EINVAL;
	}

	return 0;
}

static int kernel_context_sync_00(struct intel_engine_cs *engine, u32 *result)
{
	struct intel_context *ce;
	int err, i;

	ce = intel_context_create(engine);
	if (IS_ERR(ce))
		return PTR_ERR(ce);

	for (i = 0; i < 2; i++) {
		WRITE_ONCE(*result, 0);
		err = context_sync(ce);
		if (err)
			break;

		err = context_sync(engine->kernel_context);
		if (err)
			break;
	}
	intel_context_put(ce);
	if (err)
		return err;

	if (READ_ONCE(*result)) {
		pr_err("wa_bb emitted between the same user context [with intervening kernel]\n");
		return -EINVAL;
	}

Annotation

Implementation Notes