drivers/gpu/drm/i915/gt/uc/selftest_guc.c

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/gt/uc/selftest_guc.c
Extension
.c
Size
10369 bytes
Lines
420
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 (ret < 0) {
			i915_request_put(rq);
			return ERR_PTR(ret);
		}
	}

	i915_request_get(rq);
	i915_request_add(rq);

	return rq;
}

static int intel_guc_scrub_ctbs(void *arg)
{
	struct intel_gt *gt = arg;
	int ret = 0;
	int i;
	struct i915_request *last[3] = {NULL, NULL, NULL}, *rq;
	intel_wakeref_t wakeref;
	struct intel_engine_cs *engine;
	struct intel_context *ce;

	if (!intel_has_gpu_reset(gt))
		return 0;

	wakeref = intel_runtime_pm_get(gt->uncore->rpm);
	engine = intel_selftest_find_any_engine(gt);

	/* Submit requests and inject errors forcing G2H to be dropped */
	for (i = 0; i < 3; ++i) {
		ce = intel_context_create(engine);
		if (IS_ERR(ce)) {
			ret = PTR_ERR(ce);
			gt_err(gt, "Failed to create context %d: %pe\n", i, ce);
			goto err;
		}

		switch (i) {
		case 0:
			ce->drop_schedule_enable = true;
			break;
		case 1:
			ce->drop_schedule_disable = true;
			break;
		case 2:
			ce->drop_deregister = true;
			break;
		}

		rq = nop_user_request(ce, NULL);
		intel_context_put(ce);

		if (IS_ERR(rq)) {
			ret = PTR_ERR(rq);
			gt_err(gt, "Failed to create request %d: %pe\n", i, rq);
			goto err;
		}

		last[i] = rq;
	}

	for (i = 0; i < 3; ++i) {
		ret = i915_request_wait(last[i], 0, HZ);
		if (ret < 0) {
			gt_err(gt, "Last request failed to complete: %pe\n", ERR_PTR(ret));
			goto err;
		}
		i915_request_put(last[i]);
		last[i] = NULL;
	}

	/* Force all H2G / G2H to be submitted / processed */
	intel_gt_retire_requests(gt);
	msleep(500);

	/* Scrub missing G2H */
	intel_gt_handle_error(engine->gt, -1, 0, "selftest reset");

	/* GT will not idle if G2H are lost */
	ret = intel_gt_wait_for_idle(gt, HZ);
	if (ret < 0) {
		gt_err(gt, "GT failed to idle: %pe\n", ERR_PTR(ret));
		goto err;
	}

err:
	for (i = 0; i < 3; ++i)
		if (last[i])
			i915_request_put(last[i]);
	intel_runtime_pm_put(gt->uncore->rpm, wakeref);

Annotation

Implementation Notes