1// SPDX-License-Identifier: MIT
  2/*
  3 * Copyright © 2021-2022 Intel Corporation
  4 * Copyright (C) 2021-2002 Red Hat
  5 */
  6
  7#include "xe_ttm_sys_mgr.h"
  8
  9#include <drm/drm_managed.h>
 10
 11#include <drm/ttm/ttm_placement.h>
 12#include <drm/ttm/ttm_range_manager.h>
 13#include <drm/ttm/ttm_tt.h>
 14
 15#include "xe_bo.h"
 16#include "xe_gt.h"
 17
 18struct xe_ttm_sys_node {
 19	struct ttm_buffer_object *tbo;
 20	struct ttm_range_mgr_node base;
 21};
 22
 23static inline struct xe_ttm_sys_node *
 24to_xe_ttm_sys_node(struct ttm_resource *res)
 25{
 26	return container_of(res, struct xe_ttm_sys_node, base.base);
 27}
 28
 29static int xe_ttm_sys_mgr_new(struct ttm_resource_manager *man,
 30			      struct ttm_buffer_object *tbo,
 31			      const struct ttm_place *place,
 32			      struct ttm_resource **res)
 33{
 34	struct xe_ttm_sys_node *node;
 35	int r;
 36
 37	node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL);
 38	if (!node)
 39		return -ENOMEM;
 40
 41	node->tbo = tbo;
 42	ttm_resource_init(tbo, place, &node->base.base);
 43
 44	if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
 45	    ttm_resource_manager_usage(man) > (man->size << PAGE_SHIFT)) {
 46		r = -ENOSPC;
 47		goto err_fini;
 48	}
 49
 50	node->base.mm_nodes[0].start = 0;
 51	node->base.mm_nodes[0].size = PFN_UP(node->base.base.size);
 52	node->base.base.start = XE_BO_INVALID_OFFSET;
 53
 54	*res = &node->base.base;
 55
 56	return 0;
 57
 58err_fini:
 59	ttm_resource_fini(man, &node->base.base);
 60	kfree(node);
 61	return r;
 62}
 63
 64static void xe_ttm_sys_mgr_del(struct ttm_resource_manager *man,
 65			       struct ttm_resource *res)
 66{
 67	struct xe_ttm_sys_node *node = to_xe_ttm_sys_node(res);
 68
 69	ttm_resource_fini(man, res);
 70	kfree(node);
 71}
 72
 73static void xe_ttm_sys_mgr_debug(struct ttm_resource_manager *man,
 74				 struct drm_printer *printer)
 75{
 76	/*
 77	 * This function is called by debugfs entry and would require
 78	 * pm_runtime_{get,put} wrappers around any operation.
 79	 */
 80}
 81
 82static const struct ttm_resource_manager_func xe_ttm_sys_mgr_func = {
 83	.alloc = xe_ttm_sys_mgr_new,
 84	.free = xe_ttm_sys_mgr_del,
 85	.debug = xe_ttm_sys_mgr_debug
 86};
 87
 88static void ttm_sys_mgr_fini(struct drm_device *drm, void *arg)
 89{
 90	struct xe_device *xe = (struct xe_device *)arg;
 91	struct ttm_resource_manager *man = &xe->mem.sys_mgr;
 92	int err;
 93
 94	ttm_resource_manager_set_used(man, false);
 95
 96	err = ttm_resource_manager_evict_all(&xe->ttm, man);
 97	if (err)
 98		return;
 99
100	ttm_resource_manager_cleanup(man);
101	ttm_set_driver_manager(&xe->ttm, XE_PL_TT, NULL);
102}
103
104int xe_ttm_sys_mgr_init(struct xe_device *xe)
105{
106	struct ttm_resource_manager *man = &xe->mem.sys_mgr;
107	struct sysinfo si;
108	u64 gtt_size;
109
110	si_meminfo(&si);
111	gtt_size = (u64)si.totalram * si.mem_unit;
112	/* TTM limits allocation of all TTM devices by 50% of system memory */
113	gtt_size /= 2;
114
115	man->use_tt = true;
116	man->func = &xe_ttm_sys_mgr_func;
117	ttm_resource_manager_init(man, &xe->ttm, gtt_size >> PAGE_SHIFT);
118	ttm_set_driver_manager(&xe->ttm, XE_PL_TT, man);
119	ttm_resource_manager_set_used(man, true);
120	return drmm_add_action_or_reset(&xe->drm, ttm_sys_mgr_fini, xe);
121}