1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2021-2022 Intel Corporation
4 * Copyright (C) 2021-2022 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(bo: tbo, place, res: &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, res: &node->base.base);
60 kfree(objp: 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(objp: 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 xe_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, used: false);
95
96 err = ttm_resource_manager_evict_all(bdev: &xe->ttm, man);
97 if (err)
98 return;
99
100 ttm_resource_manager_cleanup(man);
101 ttm_set_driver_manager(bdev: &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(val: &si);
111 /* Potentially restrict amount of TT memory here. */
112 gtt_size = (u64)si.totalram * si.mem_unit;
113
114 man->use_tt = true;
115 man->func = &xe_ttm_sys_mgr_func;
116 ttm_resource_manager_init(man, bdev: &xe->ttm, size: gtt_size >> PAGE_SHIFT);
117 ttm_set_driver_manager(bdev: &xe->ttm, XE_PL_TT, manager: man);
118 ttm_resource_manager_set_used(man, used: true);
119 return drmm_add_action_or_reset(&xe->drm, xe_ttm_sys_mgr_fini, xe);
120}
121

source code of linux/drivers/gpu/drm/xe/xe_ttm_sys_mgr.c