1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/* Copyright 2018-2019 Qiang Yu <yuq825@gmail.com> */
3
4#include <linux/pid.h>
5#include <linux/slab.h>
6
7#include "lima_device.h"
8#include "lima_ctx.h"
9
10int lima_ctx_create(struct lima_device *dev, struct lima_ctx_mgr *mgr, u32 *id)
11{
12	struct lima_ctx *ctx;
13	int i, err;
14
15	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
16	if (!ctx)
17		return -ENOMEM;
18	ctx->dev = dev;
19	kref_init(&ctx->refcnt);
20
21	for (i = 0; i < lima_pipe_num; i++) {
22		err = lima_sched_context_init(dev->pipe + i, ctx->context + i);
23		if (err)
24			goto err_out0;
25	}
26
27	err = xa_alloc(&mgr->handles, id, ctx, xa_limit_32b, GFP_KERNEL);
28	if (err < 0)
29		goto err_out0;
30
31	ctx->pid = task_pid_nr(current);
32	get_task_comm(ctx->pname, current);
33
34	return 0;
35
36err_out0:
37	for (i--; i >= 0; i--)
38		lima_sched_context_fini(dev->pipe + i, ctx->context + i);
39	kfree(ctx);
40	return err;
41}
42
43static void lima_ctx_do_release(struct kref *ref)
44{
45	struct lima_ctx *ctx = container_of(ref, struct lima_ctx, refcnt);
46	int i;
47
48	for (i = 0; i < lima_pipe_num; i++)
49		lima_sched_context_fini(ctx->dev->pipe + i, ctx->context + i);
50	kfree(ctx);
51}
52
53int lima_ctx_free(struct lima_ctx_mgr *mgr, u32 id)
54{
55	struct lima_ctx *ctx;
56	int ret = 0;
57
58	mutex_lock(&mgr->lock);
59	ctx = xa_erase(&mgr->handles, id);
60	if (ctx)
61		kref_put(&ctx->refcnt, lima_ctx_do_release);
62	else
63		ret = -EINVAL;
64	mutex_unlock(&mgr->lock);
65	return ret;
66}
67
68struct lima_ctx *lima_ctx_get(struct lima_ctx_mgr *mgr, u32 id)
69{
70	struct lima_ctx *ctx;
71
72	mutex_lock(&mgr->lock);
73	ctx = xa_load(&mgr->handles, id);
74	if (ctx)
75		kref_get(&ctx->refcnt);
76	mutex_unlock(&mgr->lock);
77	return ctx;
78}
79
80void lima_ctx_put(struct lima_ctx *ctx)
81{
82	kref_put(&ctx->refcnt, lima_ctx_do_release);
83}
84
85void lima_ctx_mgr_init(struct lima_ctx_mgr *mgr)
86{
87	mutex_init(&mgr->lock);
88	xa_init_flags(&mgr->handles, XA_FLAGS_ALLOC);
89}
90
91void lima_ctx_mgr_fini(struct lima_ctx_mgr *mgr)
92{
93	struct lima_ctx *ctx;
94	unsigned long id;
95
96	xa_for_each(&mgr->handles, id, ctx) {
97		kref_put(&ctx->refcnt, lima_ctx_do_release);
98	}
99
100	xa_destroy(&mgr->handles);
101	mutex_destroy(&mgr->lock);
102}
103