drivers/gpu/drm/i915/gem/i915_gem_pm.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/gem/i915_gem_pm.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/gem/i915_gem_pm.c
Extension
.c
Size
6733 bytes
Lines
266
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 (mr->type == INTEL_MEMORY_LOCAL) {
			ret = i915_ttm_restore_region(mr, flags);
			if (ret)
				break;
		}
	}

	return ret;
}

static int lmem_suspend(struct drm_i915_private *i915, u32 flags)
{
	struct intel_memory_region *mr;
	int ret = 0, id;

	for_each_memory_region(mr, i915, id) {
		if (mr->type == INTEL_MEMORY_LOCAL) {
			ret = i915_ttm_backup_region(mr, flags);
			if (ret)
				break;
		}
	}

	return ret;
}

static void lmem_recover(struct drm_i915_private *i915)
{
	struct intel_memory_region *mr;
	int id;

	for_each_memory_region(mr, i915, id)
		if (mr->type == INTEL_MEMORY_LOCAL)
			i915_ttm_recover_region(mr);
}

int i915_gem_backup_suspend(struct drm_i915_private *i915)
{
	int ret;

	/* Opportunistically try to evict unpinned objects */
	ret = lmem_suspend(i915, I915_TTM_BACKUP_ALLOW_GPU);
	if (ret)
		goto out_recover;

	i915_gem_suspend(i915);

	/*
	 * More objects may have become unpinned as requests were
	 * retired. Now try to evict again. The gt may be wedged here
	 * in which case we automatically fall back to memcpy.
	 * We allow also backing up pinned objects that have not been
	 * marked for early recover, and that may contain, for example,
	 * page-tables for the migrate context.
	 */
	ret = lmem_suspend(i915, I915_TTM_BACKUP_ALLOW_GPU |
			   I915_TTM_BACKUP_PINNED);
	if (ret)
		goto out_recover;

	/*
	 * Remaining objects are backed up using memcpy once we've stopped
	 * using the migrate context.
	 */
	ret = lmem_suspend(i915, I915_TTM_BACKUP_PINNED);
	if (ret)
		goto out_recover;

	return 0;

out_recover:
	lmem_recover(i915);

	return ret;
}

void i915_gem_suspend_late(struct drm_i915_private *i915)
{
	struct drm_i915_gem_object *obj;
	struct list_head *phases[] = {
		&i915->mm.shrink_list,
		&i915->mm.purge_list,
		NULL
	}, **phase;
	struct intel_gt *gt;
	unsigned long flags;
	unsigned int i;
	bool flush = false;

	/*

Annotation

Implementation Notes