Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
17struct xe_ttm_sys_node {
18 struct ttm_buffer_object *tbo;
19 struct ttm_range_mgr_node base;
20};
21
22static inline struct xe_ttm_sys_node *
23to_xe_ttm_sys_node(struct ttm_resource *res)
24{
25 return container_of(res, struct xe_ttm_sys_node, base.base);
26}
27
28static int xe_ttm_sys_mgr_new(struct ttm_resource_manager *man,
29 struct ttm_buffer_object *tbo,
30 const struct ttm_place *place,
31 struct ttm_resource **res)
32{
33 struct xe_ttm_sys_node *node;
34 int r;
35
36 node = kzalloc_flex(*node, base.mm_nodes, 1);
37 if (!node)
38 return -ENOMEM;
39
40 node->tbo = tbo;
41 ttm_resource_init(tbo, place, &node->base.base);
42
43 if (!(place->flags & TTM_PL_FLAG_TEMPORARY) &&
44 ttm_resource_manager_usage(man) > (man->size << PAGE_SHIFT)) {
45 r = -ENOSPC;
46 goto err_fini;
47 }
48
49 node->base.mm_nodes[0].start = 0;
50 node->base.mm_nodes[0].size = PFN_UP(node->base.base.size);
51 node->base.base.start = XE_BO_INVALID_OFFSET;
52
53 *res = &node->base.base;
54
55 return 0;
56
57err_fini:
58 ttm_resource_fini(man, &node->base.base);
59 kfree(node);
60 return r;
61}
62
63static void xe_ttm_sys_mgr_del(struct ttm_resource_manager *man,
64 struct ttm_resource *res)
65{
66 struct xe_ttm_sys_node *node = to_xe_ttm_sys_node(res);
67
68 ttm_resource_fini(man, res);
69 kfree(node);
70}
71
72static void xe_ttm_sys_mgr_debug(struct ttm_resource_manager *man,
73 struct drm_printer *printer)
74{
75 /*
76 * This function is called by debugfs entry and would require
77 * pm_runtime_{get,put} wrappers around any operation.
78 */
79}
80
81static const struct ttm_resource_manager_func xe_ttm_sys_mgr_func = {
82 .alloc = xe_ttm_sys_mgr_new,
83 .free = xe_ttm_sys_mgr_del,
84 .debug = xe_ttm_sys_mgr_debug
85};
86
87static void xe_ttm_sys_mgr_fini(struct drm_device *drm, void *arg)
88{
89 struct xe_device *xe = (struct xe_device *)arg;
90 struct ttm_resource_manager *man = &xe->mem.sys_mgr;
91 int err;
92
93 ttm_resource_manager_set_used(man, false);
94
95 err = ttm_resource_manager_evict_all(&xe->ttm, man);
96 if (err)
97 return;
98
99 ttm_resource_manager_cleanup(man);
100 ttm_set_driver_manager(&xe->ttm, XE_PL_TT, NULL);
101}
102
103int xe_ttm_sys_mgr_init(struct xe_device *xe)
104{
105 struct ttm_resource_manager *man = &xe->mem.sys_mgr;
106 struct sysinfo si;
107 u64 gtt_size;
108
109 si_meminfo(&si);
110 /* Potentially restrict amount of TT memory here. */
111 gtt_size = (u64)si.totalram * si.mem_unit;
112
113 man->use_tt = true;
114 man->func = &xe_ttm_sys_mgr_func;
115 ttm_resource_manager_init(man, &xe->ttm, gtt_size >> PAGE_SHIFT);
116 ttm_set_driver_manager(&xe->ttm, XE_PL_TT, man);
117 ttm_resource_manager_set_used(man, true);
118 return drmm_add_action_or_reset(&xe->drm, xe_ttm_sys_mgr_fini, xe);
119}