drivers/gpu/drm/xe/xe_ttm_sys_mgr.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/xe/xe_ttm_sys_mgr.c
Extension
.c
Size
2872 bytes
Lines
120
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

struct xe_ttm_sys_node {
	struct ttm_buffer_object *tbo;
	struct ttm_range_mgr_node base;
};

static inline struct xe_ttm_sys_node *
to_xe_ttm_sys_node(struct ttm_resource *res)
{
	return container_of(res, struct xe_ttm_sys_node, base.base);
}

static int xe_ttm_sys_mgr_new(struct ttm_resource_manager *man,
			      struct ttm_buffer_object *tbo,
			      const struct ttm_place *place,
			      struct ttm_resource **res)
{
	struct xe_ttm_sys_node *node;
	int r;

	node = kzalloc_flex(*node, base.mm_nodes, 1);
	if (!node)
		return -ENOMEM;

	node->tbo = tbo;
	ttm_resource_init(tbo, place, &node->base.base);

	if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
	    ttm_resource_manager_usage(man) > (man->size << PAGE_SHIFT)) {
		r = -ENOSPC;
		goto err_fini;
	}

	node->base.mm_nodes[0].start = 0;
	node->base.mm_nodes[0].size = PFN_UP(node->base.base.size);
	node->base.base.start = XE_BO_INVALID_OFFSET;

	*res = &node->base.base;

	return 0;

err_fini:
	ttm_resource_fini(man, &node->base.base);
	kfree(node);
	return r;
}

static void xe_ttm_sys_mgr_del(struct ttm_resource_manager *man,
			       struct ttm_resource *res)
{
	struct xe_ttm_sys_node *node = to_xe_ttm_sys_node(res);

	ttm_resource_fini(man, res);
	kfree(node);
}

static void xe_ttm_sys_mgr_debug(struct ttm_resource_manager *man,
				 struct drm_printer *printer)
{
	/*
	 * This function is called by debugfs entry and would require
	 * pm_runtime_{get,put} wrappers around any operation.
	 */
}

static const struct ttm_resource_manager_func xe_ttm_sys_mgr_func = {
	.alloc = xe_ttm_sys_mgr_new,
	.free = xe_ttm_sys_mgr_del,
	.debug = xe_ttm_sys_mgr_debug
};

static void xe_ttm_sys_mgr_fini(struct drm_device *drm, void *arg)
{
	struct xe_device *xe = (struct xe_device *)arg;
	struct ttm_resource_manager *man = &xe->mem.sys_mgr;
	int err;

	ttm_resource_manager_set_used(man, false);

	err = ttm_resource_manager_evict_all(&xe->ttm, man);
	if (err)
		return;

	ttm_resource_manager_cleanup(man);
	ttm_set_driver_manager(&xe->ttm, XE_PL_TT, NULL);
}

int xe_ttm_sys_mgr_init(struct xe_device *xe)
{
	struct ttm_resource_manager *man = &xe->mem.sys_mgr;
	struct sysinfo si;

Annotation

Implementation Notes